-
The rapid development of biomaterials and biotechnology has provided important means for revealing life phenomena and life processes, which is the basis for tissue and organ regeneration and reconstruction, and so is the catalyst for a second life. This special issue “Development and Exploration of Biomaterials in Shenzhen” has published wonderful reports and extended content of the 2021 Shenzhen Biomedical Materials Annual Conference, so that the readers who were unable to attend due to the COVID-19 epidemic could also take a glimpse of this annual conference via the special issue. [MORE]
-
The ocean plays an important role in the future development. The Shenzhen Institute of Advanced Technology(SIAT), Chinese Academy of Sciences has deeply involved in the field of marine science. This special issue introduces recent research of SIAT’s team, covering marine engineering technology, underwater acoustic technology, underwater wireless transmission technology, marine biochemical sensing technology and seawater desalination technology, etc. In addition, low-power marine instrument recovery communication beacons developed by Professor Yang Ting’s team [MORE]
-
Advanced electronic material is one of the three main elements of integrated circuit and is the foundation and support of electronic information industry. Trade frictions occurred in recent years fully illustrate the strategic importance of materials, especially electronic materials used in integrated circuit industry. In this context, we specially invited Professor Rong Sun, director of the Shenzhen Institute of Advanced Electronic Materials, as the guest editor to organize the special issue focused on high-end electronic packaging materials for integrated circuit [MORE]
-
In recent years, the Chinese government has provided strong support for new energy vehicles and intelligent connected vehicles in terms of scientific and technological research, industrial development, application demonstration, and market promotion. Interestingly, China has become one of the most active countries in the field of new energy vehicles. Although the new energy vehicle industry has shown a good momentum in China, it has to overcome core technological barriers. [MORE]
-
With the rise of 5G communication, Internet of Things, new energy automotive electronics, wearable devices, and smart cities, affiliated electronic devices are developing towards the directions of miniaturization, high-power density, and multi-functionality. This will continue to increase the risk of overheating with related electronic devices. The development of high-performance thermal management materials is crucial to improve the heat dissipation of electronic devices, and it has become the biggest challenge faced by academia and application industry in electronic devices. [MORE]
-
Recently, with the maturity and popularization of technologies such as Internet of Things, cloud computing, mobile internet, and Internet of Vehicles, massive data in various formats like images, audiovisual materials, and health files are rapidly generated. The International Data Corporation (IDC) predicted that global data volume would reach 175 ZB (approximately 175 billion TB) by 2025, which indicated that more than 99% of all data in human civilization were generated in recent years. [MORE]
-
This special issue majorly reports the research exploration made by the key members from Guangdong Innovation Team of Advanced Functional Film Materials and Industrial Applications, which includes the analysis and discussion of preparation methods and growth mechanism of high-preferred orientation diamond film and high-quality single crystal diamond, the research of diamond film in cemented carbide tools, the latest research progress on film thermal expansion coefficient and residual stress testing technology. [MORE]
-
Big data is leading a new round of technological innovation, and it has brought new impetus and opportunities for the transformation and upgrading of social economy and the enhancement of national competitiveness. Therefore, many countries have proposed initiatives to develop big data. In recent years, big data has triggered extensive studies in a variety of disciplines and brought changes in terms of technology, model and ideology to different industries. The special issue was organized around big data platforms and supporting technologies, and big data applications, security and privacy [MORE]
-
Intelligent connected vehicles are equipped with advanced on-board sensors, controllers, actuators and other devices, and integrate modern communication and network technologies to realize information sharing between vehicles, roads, people, and clouds to achieve "safe, efficient, comfortable and energy-saving" driving. Although the industry shows a positive trend of comprehensive development, it is facing several technical adjustments on core technology level, including bicycle perception and decision-making, vehicle-road cooperation, human-machine co-driving [MORE]
- Current Issue
- In Press
- Archive
- Virtual Special Issue
- Most Downloaded
- Most Cited
-
2024,13(5):1-2, DOI: 10.12146/j.issn.2095-3135.202405000
Abstract:
-
CHEN Jiang, ZHU Honglin, MENG Jintao, WEI Yanjie
2024,13(5):3-18, DOI: 10.12146/j.issn.2095-3135.20240202001
Abstract:
Convolutional Neural Networks (CNNs) as a quintessential representation of deep learning, are the most commonly used neural networks in tasks such as computer vision. However, convolution operations typically account for over 90% of the runtime in CNNs, becoming a bottleneck for performance. Additionally, due to the complexity of current hardware and the diversity of workloads, specific optimizations in previous work often lack performance portability. To address this problem, the author introduces BlazerML, an open-source convolution computation library based on auto-generated code templates from TVM, capable of automatically generating high-performance convolution implementations for any input shape. BlazerML is implemented based on the Winograd algorithm, known for its high performance in fast convolution algorithms. Experimental results demonstrate that BlazerML significantly outperforms current state-of-the-art open-source libraries. On x86 CPUs, running common deep learning network forward inferences, it is faster by 1.18—2.47 times, 1.18—2.27 times, and 1.01—1.66 times compared to OnnxRuntime, MNN, and the TVM community version, respectively. On ARM CPUs, for single-layer inference of common deep learning networks, it surpasses ACL and FastConv by 1.26—6.11 times and 1.04—4.28 times, respectively.
-
LE Xin, WU Hua, YANG Jun, CHENG Guang, HU Xiaoyan
2024,13(5):19-29, DOI: 10.12146/j.issn.2095-3135.20240124002
Abstract:
Existing methods for video traffic identification are mainly targeted at specific platforms and mostly require capturing full flows, which makes them unsuitable for high-speed networks management. This paper proposes a method for video traffic identification from multi-platforms in the sampled high-speed traffic.This paper analyze multiple video platform transmission protocols, extract features based on their common characteristics to construct a composite feature space, and further process these features to eliminate the effect of sampling on feature stability. Then, feature vectors are extracted and a classification model is trained. In the experiments, high-speed networks traffic with a bandwidth of 10 Gbps and a sampling rate of 1:32 was used. The results showed that the proposed method can quickly identify video traffic from multi-platforms with a precision of over 98%.
-
2024,13(5):30-39, DOI: 10.12146/j.issn.2095-3135.20240205001
Abstract:
In response to the current power plant switch detection methods that are unable to cope with realworld open-set environments and the low accuracy in recognizing rare categories, the target recognition problem is transformed into a similarity measurement issue, and a new algorithm is proposed. The new algorithm is based on the triplet network of deep metric learning, using a ResNet-18 with an added SE Block to extract features, and enhances learning effects by cross-batch mining. To evaluate the performance of the algorithm, a dataset with 3 300 switch images was created. The algorithm was tested on the self-built dataset for closedset testing, open-set testing, and few-shot testing. The experimental results show that the algorithm demonstrates excellent discrimination ability in the closed-set state. It can not only accurately identify the categories in the training set but also effectively distinguish states that were not encountered during training and those with lower occurrence frequencies. This capability indicates that the algorithm is not only suitable for real-world open-set environments but also significantly improves the recognition accuracy for small-sample data.
-
ZHANG Li, TAN Jingwen, MAN Dapeng, HAN Shuai, MA Shulei
2024,13(5):40-52, DOI: 10.12146/j.issn.2095-3135.20240128003
Abstract:
In the field of encrypted mobile application traffic classification, traditional methods classify traffic based on the characteristics of bidirectional traffic. However, in actual scenarios, asymmetric routing will cause remote network administrators to only obtain unidirectional traffic, which will reduce the accuracy of traditional methods. Therefore, an encrypted mobile application traffic classification method using only one-way traffic characteristics is designed. Since downlink traffic contains more information than uplink traffic, the payload of downlink traffic is chosen for analysis. Due to the temporal and spatial correlation of mobile application traffic, a bidirectional long short-term memory network is proposed to capture the temporal correlation of data streams, a convolutional neural network is used to learn the spatial correlation of features, and an attention layer is introduced to focus on important features to further improve the recognition accuracy. Compared with the previous methods, this method has a wider range of use, can be applied to both unidirectional and bidirectional traffic scenarios, and uses fewer features to obtain higher accuracy.
-
ZHANG Jingwen, CUI Shiyao, ZHANG Xinghua, SU Taoyu, LIU Tingwen
2024,13(5):53-63, DOI: 10.12146/j.issn.2095-3135.20240131001
Abstract:
In multi-party conversations, identifying the reply-to relation between messages is an important task in the dialogue domain. Existing efforts have not addressed the following two issues related to data distribution: shorter messages tend to appear more frequently, while shorter texts contain less semantic information, which limits the learning ability of the model; the number of positive samples with reply-to relation is often much less than the number of negative samples, leading to data skewness issue during training phase and reducing the model’s performance in processing positive samples. Aiming at the two issues, this paper proposes an improved model based on a pre-trained language model, which firstly mitigates the short text-related issue through dynamic inquiry window modeling; and then copes with the positive sample-related issue through position-driven positive sample weight optimization. The paper is compared with previous research, and the experimental results show that this paper’s work improves the recall metric by an average of 15.7% compared to the baseline model based on the pre-trained language model. In addition, this paper constructs a new dataset collected from the Telegram platform, which can provide data support for subsequent related studies.
-
XIA Bing, YANG Ruinan, DONG Yu, CHU Shihao, TANG Chongjun, GE Yunxiang, YIN Jiabin
2024,13(5):64-73, DOI: 10.12146/j.issn.2095-3135.20240124001
Abstract:
Metaphor has the purpose of inspiring understanding and persuading others. Currently, metaphor presents the trend of multimodal integration of text, images, and videos. Therefore, identifying the metaphorical semantics contained in multimodal contents has research value for Internet content security. Due to the lack of multimodal metaphor datasets, it is difficult to establish research models. Therefore, current scholars pay more attention to text-based metaphor detection. To overcome this shortcoming, the paper first generates a new multimodal metaphor dataset from the perspectives of image-text, metaphor appearance, emotion expression, and author intention. Then, Kappa scores were used to assess the consistency among the annotators of the dataset. Finally, a multimodal metaphor detection model is constructed to verify the quality and value of the multimodal data set by combining image attribute features, image entity features, and text features with the help of a pre-training model and attention mechanism. The experimental results show that the metaphor dataset with emotion and intention can improve the effectiveness of metaphor model detection, and confirm that the interrelationship of multimodal information is helpful for understanding metaphor.
-
TONG Xin, YANG Ying, SUO Qiwei, WANG Zhihong
2024,13(5):74-92, DOI: 10.12146/j.issn.2095-3135.20240130001
Abstract:
With the rapid development of Internet technology, network security issues have become increasingly prominent. Among these, the identification and classification of encrypted traffic have emerged as significant research directions. This paper provides a comprehensive review of current machine learning-based techniques for encrypted traffic classification. First, it briefly introduces common encryption protocols and their characteristics from a layered perspective. Then, it provides an overview of the datasets and evaluation metrics used in this field. Furthermore, a discussion on encrypted traffic analysis methods based on traditional machine learning and deep learning is conducted, with a detailed analysis of key techniques such as feature engineering and classifier models. Finally, it summarizes the challenges currently faced in this field, including the lack of interpretability and the risk of adversarial examples, and looks ahead to future research directions aimed at enhancing interpretability, automating feature extraction, and automating optimizing model structures.
-
GUO Haifeng, DU Xintong, ZHANG Yuxi
2024,13(5):93-102, DOI: 10.12146/j.issn.2095-3135.20240128001
Abstract:
The unique financial characteristics make smart contract, which are widely nested in various blockchain platforms, one of the most successful applications of blockchain technology. Due to the high economic value of carrying large amounts of assets and virtual currencies, smart contracts are constantly subject to various security attacks. In addition, features such as anonymity and automatic execution make smart contracts used in a variety of illegal transactions and malicious applications. Based on this, the paper firstly introduces the operation mechanism and principle of smart contracts in blockchain-related technologies, discusses the application scenarios of smart contract technology and the potential security vulnerabilities and security problems that may be triggered by the development of smart contract technology, and then, based on the summary of the existing research work, discusses the challenges faced by the field of smart contract vulnerability detection, and looks forward to the future research direction of smart contracts in combination with deep learning technology.
-
zhangmingkai,gufeifei,xiaozhenzhong,shishaoguang
Doi: 10.12146/j.issn.2095-3135.20240820001
Abstract:
The accurate reconstruction of industrial component edges is essential and crucial for visual positioning and quality inspection. To address the issue of difficulty in accurately reconstructing point clouds at the edges of industrial components, a three-dimensional reconstruction algorithm based on point cloud projection is proposed. First, the three-dimensional point cloud of the components is obtained by scanning using a binocular structured light method, edge points in the scanned point cloud are extracted. Then the image edge points are extracted from the binocular images. Subsequently, the point cloud edge points are projected onto the binocular images, the nearest image edge points are searched around each projected point to obtain corresponding binocular edge points. Finally, accurate three-dimensional edge point clouds are reconstructed using stereo vision methods. Experimental results demonstrate that compared to other current methods, this approach can effectively address the issue of false edges caused by interference such as reflection and surface scratches, the reconstructed edge point cloud using this method has high accuracy with reconstruction error less than 0.15 mm and can be applied in industrial scenarios such as bin picking, online quality inspection.
-
Zhong Jiafeng,Xu Liang,Zhou Ruiyi,Chen Bo,Zhu Yingjie,Li Lei,Xu Wei
Doi: 10.12146/j.issn.2095-3135.20240809002
Abstract:
Ketamine, an N-methyl-D-aspartate receptor (NMDAR) antagonist, is clinically utilized for sedation, anesthesia, and the treatment of refractory depression. However, its addictive properties restrict its clinical application. A dose of 0.5 mg/kg is commonly used as an antidepressant in clinical settings, while 15 mg/kg represents the dose typically abused. The effects of varying doses of ketamine on brain network activation remain unclear. In this experiment, two representative doses of ketamine, 0.5 mg/kg and 15 mg/kg, were administered via intraperitoneal injection for 7 consecutive days. Brain network activation was assessed by examining the expression of the immediate early gene protein (cFos). Results indicated that, compared to the saline control group, 0.5 mg/kg ketamine significantly increased the number of cFos-positive cells in the medial prefrontal cortex, intermediate lateral septal nucleus, and periaqueductal gray matter. Conversely, 15 mg/kg ketamine significantly increased cFos expression in the nucleus accumbens, lateral habenula, hippocampal CA3 region, amygdala, and ventral tegmental area. These findings suggest that ketamine"s activation of brain networks is dose-dependent, with different doses activating distinct brain regions. This study lays a foundation for investigating the neuropharmacological effects of different ketamine doses and provides a reference for identifying brain regions associated with its antidepressant and addictive properties.
-
Duan Yulong,Hu Wei,Huang Yi,Chen Ken
Doi: 10.12146/j.issn.2095-3135.20231030001
Abstract:
The usage of mmWave radar for non-contact vital signs monitoring has shown great potentials in the medical and healthcare fields, which enables continuous and imperceptible identity verification. Due to the complex impact of various factors on heart movement, the FMCW mmWave radar can better monitor and capture heart data during sleep, and the obtained heart data can be recognized and classified based on the uniqueness of personal heart movement characteristics. In this study, we propose a deep convolution neural network for identification recognition from one-dimensional time series data of the heart radar signal. The results were compared with 3 SOTA methods, i.e. LSTM, InceptionTime and LSTformer. All the models achieved classification accuracies about 90% on an experimentally acquired heart signal data set in sleep posture. The InceptionTime model has the highest accuracy, but it takes the longest time. The LSTM and LSTformer models have the lower accuracy but the shorter calculation time. The proposed CNN model can obtain similar accuracy but better efficiency in comparison with InceptionTime model.
-
Kong Weikun,Zhong Cheng,Chen Wenbo,YU Shuhui,Sun Rong
Doi: 10.12146/j.issn.2095-3135.20240119001
Abstract:
Against the backdrop of Moore''s Law approaching its limit and the difficulty and surging cost of next-generation integrated circuit technologies, advanced substrate technology is an important carrier to support huge I/O enhancement as well as system integration in the field of advanced packaging, and is one of the core components in the post-Moore era. Currently, semi-additive process based on build-up film (BF) is one of the main ways to realize fine-pitch multilayer packaging substrates. In view of the increasingly prominent problem of signal integrity when electronic equipment operates in high-frequency and high-speed scenes, this paper deeply discusses the influence of physical property of BF materials and structural characteristics on signal transmission loss. Based on typical substrate structures such as microstrip lines and vias, the relationship between BF material parameters and signal transmission performance is studied by electrical simulation analysis system. It is found that in microstrip structure, the signal transmission loss increases with the increase of frequency, and this loss is closely related to the dielectric loss factor of BF material. However, in the via structure, the dielectric constant of BF material has a significant influence on the equivalent capacitance and impedance extreme value, and then affects the impedance mismatch. Although the characteristics of BF material have some influence on impedance mismatch, the design of via structure itself is still the main factor affecting impedance matching. In addition, the conductor loss caused by conductor skin effect increases with the increase of copper foil roughness at high frequency, which provides an important reference for the quality control of copper foil in the manufacturing process of packaging substrate. This study reveals the influence mechanism of BF material and structural characteristics on signal transmission loss, which provides a theoretical basis for the design and optimization of BF material with improved physical properties for packaging substrate.
-
BAO Lixing,ZHAO Feng,HUANG Xiaoluo,WANG Yang
Doi: 10.12146/j.issn.2095-3135.20240423001
Abstract:
Data provenance technology is capable of recording and tracking the origins of sensitive documents to prevent their leakage. Traditional network path tracing methods are ineffective in tracking offline documents, and key tracing for encrypted files does not ensure reliable provenance for shared files. Existing techniques such as annotation, reverse querying, and data watermarking often require user involvement and are implemented at the application layer, resulting in inadequate security, lack of transparency and flexibility, and insufficient overall system scalability. This paper introduces an innovative script-based dynamic fingerprint provenance architecture that utilizes modifications to the Linux kernel to achieve foundational provenance, enhancing the security and transparency of document tracing. The fingerprint tracking algorithm is implemented through user scripts, improving the flexibility and effectiveness of document provenance. Additionally, the fingerprint-driven algorithm is designed to meet the demands of multi-load sharing, ensuring efficient and scalable document sharing. Upon verification, this architecture has a minimal impact on the operating system and exhibits excellent scalability. In scenarios involving single or multiple load sharing, the fingerprint-driven algorithm demonstrates transparency, real-time performance, and efficiency.
-
Doi: 10.12146/j.issn.2095-3135.20240422001
Abstract:
In this work, a new paradigm of visual language modeling is introduced in ophthalmic image disease recognition. And a multi-disease recognition algorithm based on a pre-trained model of contrasting language images is proposed. First, a new multi-labeled fundus image dataset MDFCD8 containing 8 categories is constructed based on several publicly available fundus image datasets. Then, the generative artificial intelligence GPT-4 is utilized to generate expert knowledge describing the fine-grained pathological features of fundus images, which solves the problem of the lack of text labels in fundus image datasets. The experimental results showed that, the proposed method outperforms the traditional convolutional neural network and Transformer network by 4.8% and 3.2%, respectively. This study also conducted ablation experiments on each module to validate the effectiveness of the method, and also demonstrated the potential of visual language modeling in ophthalmic disease research.
-
xu tao,wang shun cheng,zhong jian wen,liu da bo,zhou yi longn,liu chang
Doi: 10.12146/j.issn.2095-3135.20240307001
Abstract:
Adenoid hypertrophy (AH) is a key contributor to pediatric obstructive sleep apnea syndrome (OSAS). Physicians rely on nasopharyngeal endoscopy to identify AH and the obstruction of adenoid to the airway. However, due to the limitations of 2D endoscope images, physicians have to infer the 3D structure of the adenoid region, which heavily relies on their expertise and the angle at which the adenoids are observed. The adenoid area is composed of mucosal tissue covered by nasal secretions, which may cause strong reflectivity, sparse features, smooth scenes, and blurred images. Based on these unique characteristics of the adenoids, this paper introduces a multi-view stereo algorithm based on endoscopic image sequences of the adenoid nasopharyngeal cavity. The algorithm employs multi-view stereo to first estimate a depth map corresponding to the images. Subsequently, it utilizes mesh surfaces to fit the rough depth information in the depth space, resulting in smooth and refined depth maps. This leads to a dense and precise reconstruction of the adenoid region. Both synthetic and real experimental results demonstrate that the algorithm can achieve accurate, dense, and smooth reconstruction of the adenoid area, surpassing the existing reconstruction algorithms significantly.
-
Xie Zhijun,Zhao Canming,Ke Xin,Xiao Yang,Wu Jing,Song Jialei
Doi: 10.12146/j.issn.2095-3135.20240312002
Abstract:
This paper presents a design of single-joint biomimetic robotic fish with compact structure and high swimming efficiency. It allows for convenient disassembly and assembly of pectoral fins, pelvic fins, and caudal fins. The influence of pectoral and pelvic fins on swimming performance was studied via underwater experiments. In the prototype swimming tests, a "binocular vision system" for tracking and recording the motion of the robotic fish was constructed using a high-speed camera and a flat mirror. It enabled tracking and recording of the three-dimensional position information of two marked points on the foremost end of the fish head and above its center of mass. This system provided data support for the quantitative analysis of the swimming performance, posture changes, and head stability of the robotic fish. The results indicated that the robotic fish have good performance in linear propulsion and turning. In the stability experiments, the head stability of the robotic fish equipped with pectoral fins and pelvic fins is better during low-frequency swimming. But no advantage is shown during high-frequency swimming, which is consistent with the phenomenon of various fins of fish in the natural environment being close to the body during high-frequency swimming except for the caudal fin.
-
Liang Zhanxiong,Sun Xudong,Cai Yonda,Zhang Yuming,Mai Langjie,He Yulin,Huang Zhexue
Doi: 10.12146/j.issn.2095-3135.20240224001
Abstract:
LOGO is a new distributed computing framework using a Non-MapReduce computing paradigm. Under the LOGO framework, big data distributed computing is completed in two steps. The LO operation runs a serial algorithm in a number of nodes or virtual machines to process independently the random sample data blocks, generating local results. The GO operation uploads all local results to the master node and integrate them to obtain the approximate result of the big data set. The LOGO computing framework eliminates data communication between nodes during iterations of the algorithm, greatly improving computing efficiency, reducing memory requirements, and enhancing data scalability. This article proposes a new distributed machine learning algorithm library RSP-LOGOML under the LOGO computing framework. A new distributed computing is divided into two parts: the serial algorithm executed by the LO operation and the ensemble algorithm executed in the GO operation. The LO operation can directly execute existing serial machine learning algorithms without the need to rewrite them according to MapReduce. The GO operation executes ensemble algorithms of different kinds depending on the ensemble tasks. In this article, the principle of LOGO distributed computing is introduced first, followed by the algorithm library structure, the method for packaging existing serial algorithms and the ensemble strategy. Finally, implementation in Spark, App development, and the results of performance tests for various algorithms are demonstrated.
-
Chetali Gurung,Aamir Nawaz,Dr. U Anjaneyulu,Pei-Gen Ren
Doi: 10.12146/j.issn.2095-3135.20231206002
Abstract:
The ability to mimic the microenvironment of the human body through fabrication of scaffolds itself a great achievement in the biomedical field. However, the search for the ideal scaffold is still in its infant stage and there are significant challenges to overcome. In the modern era, scientific communities are more attracted to natural substances due to their excess biological ability, low cost, biodegradability, and lesser toxic than synthetic lab made products. Chitosan is a well-known polysaccharide that has recently grabbed high amount of attention for its biological activities, especially in 3D bone tissue engineering (BTE). Chitosan greatly matches with the native tissues and thus stands out as a popular candidate for bioprinting. This review focuses on the potential of chitosan based scaffolds advancement and the drawbacks in bone treatment. Chitosan-based nanocomposites have exhibited strong mechanical strength, water-trapping ability, cellular interaction, and biodegradability characteristics. Chitosan derivatives have also encouraged and provided different routes of treatment and enhanced biological activities. 3D tailored bioprinting have opened new doors to design and manufacture scaffolds of biological, mechanical, and topographical properties.
-
Doi: 10.12146/j.issn.2095-3135.20240307002
Abstract:
In today''s digital age, Nginx has emerged as the most prevalent web application server on Linux systems, securing the top position in market share. Given its critical role in ensuring the quality of service for users, optimizing the performance of Nginx servers is important. Despite the widespread deployment of Nginx servers across the two main hardware architectures, X86 and ARM, a comparative analysis of performance tuning on these architectures remains unexplored. This study aims to bridge this gap by employing automatic system parameter tuning on Nginx across these architectures, revealing the significant difference. When handling dynamic requests, the optimized performance of Nginx on X86 architecture significantly outperforms that of the ARM architecture. As a result, the optimized performance of Nginx on X86 architecture achieves a P99 latency of 515 milliseconds, which is performance improvement of 287% than that of the ARM architecture. Conversely, when processing static requests, the ARM architecture demonstrates superior performance, with a P99 latency of 220 milliseconds, resulting in a performance increase of 60% than that of X86 architecture. These findings highlight the distinct advantages of X86 and ARM architectures in handling different types of loads. It shows the significant impact of hardware architecture on optimizing Nginx’s performance. Therefore, to optimize the performance of Nginx web server, system administrators must consider the performance differences between static and dynamic requests of Nginx and the unique iterative efficiency over different hardware architectures.
-
Doi: 10.12146/j.issn.2095-3135.20240312001
Abstract:
Artificial intelligence interpretability refers to the ability of people to understand and interpret the decision-making process of machine learning models. Research in this field aims to improve the transparency of machine learning algorithms, making their decisions more trustworthy and explainable. Interpretability is crucial in artificial intelligence systems, especially in sensitive and critical decision-making domains such as healthcare, finance, and law. By providing interpretability, people can better understand the reasoning behind the model''s decisions, ensuring that they are fair, robust, and ethical. In the continuously evolving field of artificial intelligence, enhancing the interpretability of models is a key step towards achieving trustworthy and sustainable AI. The article outlines the development history of interpretable artificial intelligence and the technical characteristics of various interpretability methods, with a particular focus on interpretability in the medical field. It provides a more in-depth discussion of the limitations of current methods on medical imaging datasets and proposes possible future directions for exploration.
-
Huang Jianxi,Liao Tongxin,Yu Zhuoyi,Wu Ruonan,Lu Min
Doi: 10.12146/j.issn.2095-3135.20230703002
Abstract:
As food plays an important role in people''s daily lives, a food map showing the geographical distribution of restaurants in a city is of great social value. Social media has covered every aspect of people''s lives; therefore, social media data provides a wealth of data to support automatic cartography. This work proposes an automatic generation method for urban food maps driven by social media data, integrating machine learning and cartographic algorithms to realize the intelligent generation of stylized urban food maps. A visualization system of urban food maps has been developed, which is applied to four cities, Wuhan, Guangzhou, Chongqing, and Chengdu, for case studies. The results show the effectiveness and good visual expressiveness of our method in presenting urban cuisine for cities.
-
Doi: 10.12146/j.issn.2095-3135.20231225001
Abstract:
Action recognition in the dark is a challenging task in practice because it is difficult to learn robust action representations from low light environments. Furthermore, there is a domain gap between dark scenes and the data used by traditional pretrained models, which results in suboptimal results with the traditional pretrain-finetune approach, and pretraining from scratch is costly. To address this issue, a domain-adaptive pretraining method is proposed to improve action recognition performance in the dark environments. The method integrates an external vision enhancement model for de-darkening to introduce critical knowledge for dark scene processing. It also employs a cross-domain self-distillation framework to reduce the domain gap of visual representations between illuminated and dark scenes. Through extensive experiments in various dark environment action recognition settings, the proposed approach can achieve a Top-1 accuracy of 97.19% on the dark dataset of fully supervised action recognition. In the source-free domain adaptation on the Daily-DA dataset, the accuracy can be improved to 49.11%. In the multi-source domain adaptation scenario on the Daily-DA dataset, the Top-1 accuracy can reach 54.63%.
-
Doi: 10.12146/j.issn.2095-3135.20231226001
Abstract:
Effectively transferring knowledge from pre-trained models to downstream video understanding tasks is an important topic in computer vision research. Knowledge transfer becomes more challenging in open world due to poor data conditions. Many recent multimodal pre-training models are inspired by natural language processing and perform transfer learning by designing prompt learning. In this paper, we propose an LLM-powered domain context-assisted open-world action recognition method that leverages the open-world understanding capabilities of large language models. Our approach aligns visual representation with multi-level descriptions of human actions for robust classification, by enriching action labels with contextual knowledge in large language model. In the experiments of open-world action recognition with fully supervised setting, we obtain a Top-1 accuracy of 71.86% on the ARID dataset, and an mAP of 80.93% on the Tiny-VARIT dataset. More important, our method can achieve Top-1 accuracy of 48.63% in source-free video domain adaptation and 54.36% in multi-source video domain adaptation.
-
Doi: 10.12146/j.issn.2095-3135.20230606002
Abstract:
Aiming at the performance problems of photodetectors in optical communication, remote sensing and infrared thermal imaging, the research progress of photodetectors in the near-infrared band at home and abroad was discussed. Compared with traditional compound semiconductor materials, new materials such as silicon-based, graphene, tellurium compounds, transition metal dihalogenated compounds and perovskites have unique structures and properties, and are important materials for the preparation of low-power and high-performance photodetectors. This paper mainly expounds the research progress of silicon-based near-infrared photodetectors based on PN and PiN heterojunction structures, introduces the research progress of near-infrared photodetectors based on two-dimensional materials (graphene, tellurium compounds, transition metal dihalogenated compounds) and perovskite materials, and analyzes and compares the performance parameters of related near-infrared photodetectors, which provides ideas for the subsequent research of high-performance near-infrared photodetectors.
-
Sun Yi,Wu Siman,Fang Wei,Wu Shuangqing,HU Chao
Doi: 10.12146/j.issn.2095-3135.20231108001
Abstract:
With the regulations of wearing helmets while driving the electric bicycle, it is urgent to develop a detection algorithm that can accurately detect whether the drivers are wearing helmets. This paper introduces a novel method to detect the helmets based on the YOLO framework. The branch absorption module is proposed to improve the residual backbone network, then the feature fusion is improved through the channel recombination. Finally, the designed structural fusion pruning is applied to further compress the hyper-parameters of the model. The experimental results showed that, the proposed algorithm has higher accuracy and faster speed. Performance of small targets detection also can be improved, with the average accuracy of multiple classification up to 88.8% and detection speed of 29.5fps, which can meet the demand of video surveillance in real applications.
The "In Press" section displays the articles officially accepted after peer review. These articles are currently under copyediting process without volume/issue information, but are citable according to their Digital Object Identifiers(DOI).
-
Special Issue of the 1st CCF Intelligent Vehicles Symposium, CIVS 2023
人工智能与新能源汽车的交叉融合为现代汽车工业和交通体系带来了深刻的变革,这种协同进化的发展趋势不仅推动了智能汽车产业的快速崛起,也在技术层面提出了全新的挑战。如何解决智能系统面向复杂场景的计算能力、实时性、可靠性、能耗、成本等关键问题,是未来智能汽车领域研究和产业应用的重要方向。
View
本期专刊聚焦探讨我国智能汽车领域的最新研究成果,主要介绍相关学者在智能感知、决策规划、执行控制等关键领域的研究进展以及对未来发展趋势的展望与分析。 -
Government Big Data Management and Intelligent Services
在“互联网+”环境下,政务大数据关联公共服务数据和社会传感数据,综合共享、分析和利用这些资源,将使城市管理模式从单一走向立体,使城市服务系统从孤立走向共享,使城市决策模式从机械走向智能。因此,迫切需要建立有关政务大数据管理、业务协同和智能服务的新理论、新技术和新平台,以提升城市管理和政府应急指挥决策能力。为促进互联网+政务大数据管理与智能服务,本刊特请国际欧亚科学院院士、中国科学院深圳先进技术研究院院长樊建平研究员、澳门大学科技学院院长须成忠教授、中山大学沈鸿教授、中国科学院深圳先进技术研究院尹凌研究员担任客座编辑,共同组织“政务大数据管理与智能服务专题”,以期为读者呈现该领域的研究进展与发展趋势。
View -
Mechanisms and Robotics—Innovative Tools for Modern Machines and Equipments (I)
建立现代机器与装备的原始创新能力是现代产业获取自有知识产权、提升国际市场竞争力的核心手段,是我国实现由制造大国向制造强国顺利转变的必然要求。对于以机械运动作为功能实现手段的现代机器与装备来说,其原创研发的核心问题是其功能机理的探究及其机械运动过程的构思、规划与实现问题,这正是现代机构学与机器人学的核心研究议题。为推进理论与应用深度互动,促进现代机器与装备原始创新与研发相关理论、方法、技术和应用的进步,特邀请上海交通大学郭为忠教授、中科院深圳先进院何凯老师担任客座编辑组织“机构与机器人学——现代机器与装备的创新利器”专题,分两期刊出,以期读者了解和关注该领域的研究进展与发展趋势。
View -
-
3D Vision and Visualization
In recent years, the concept of "Metaverse" has become popular again, and Facebook has even changed its name to "Meta" to embrace the metaverse. Metaverse is a concept created by the famous American science fiction writer Neal Stephenson in the novel "Snow Crash" published in 1992. Its core is to build a virtual digital world parallel to the real physical world.
But how to construct a virtual mirror of the real physical world is a key technical issue in realizing the metaverse. Vision is one of the most important ways for humans to perceive the world. With the continuous progress of 3D sensing technology, the rapid development of deep learning and the explosive growth of 3D visual data, the acquisition, analysis, understanding, expression, modeling, presentation, interaction and visualization of 3D visual data have become the core research issues in the construction of virtual images to the real world.
Our journal is honored to invite Professor Chen Baoquan, Executive Director of the Frontier Computing Research Center of Peking University, and Researcher Cheng Zhanglin of Shenzhen Institutes of Advanced Technology, Chinese Academy of Science to serve as guest editors of the special issue to share the research advancements of Chinese scholars on 3D vision and visualization.
View -
-
XIONG Gang,MENG Jiao,CAO Zi-gang,WANG Yong,GUO Li,FANG Bin-xing
2012,1(1):32-42, Doi: 10.12146/j.issn.2095-3135.201205006
Abstract:
Nowadays, with the rapid development of the Internet, more and more new applications appear gradually, the scale of network expand constantly, and the architecture of network is more and more complicated. As one of the basic technologies for enhancing network controllability, traffic classification can not only provide better QoS for ISPs, but also supervise and manage network effectively, which can ensure the security of the Internet. In this paper we review the research methods and achievements in the field of traffic classification, compare these traditional methods, and point out their advantages and disadvantages. On the other hand, for the real challenges of real-time classification of high-speed network environment, encrypted traffic classification, fine-grained traffic classification, and dynamically changed protocols classification, we describe and analyze the related research progress. Finally, we look ahead the future research direction.
-
GE Ruiquan, WANG Pu, LI Ye,CAI Yunpeng
2017,6(5):55-68, Doi: 10.12146/j.issn.2095-3135.201705006
Abstract:
Repetitive sequences are prevalent in genomes. A large number of experiments have confirmed that they play an important role in biological evolution. At present, the discovery and detection of the repetitive sequences have been becoming a hot topic of genomics. This paper summarizes the research progress in this regard, and briefly analyses the associated tools. Finally, the development of repetitive sequences in future is prospected.
-
YAN Xiaoqing,CHEN Hongyun,WU Binbin,LIU Chunhua,LIANG Yan
2015,4(4):87-93, Doi: 10.12146/j.issn.2095-3135.201504010
Abstract:
The human gut is densely populated by the gut microbiota. There are accumulating evidences indicating that the gut microbiota plays a significant role in the function of the body, which including the metabolism and energy absorption, the development in the function of gastrointestinal, the modulation of immune system and so on. Many chronic diseases, such as obesity, obesity-associated inflammation, inflammatory bowel disease and depression, are related to gut microbiota dysbiosis. The research of the interaction between intestinal bacteria and human body is instructive to the prevention or treatment of many chronic diseases and maintaining health.
-
2012,1(3):1-9, Doi: 10.12146/j.issn.2095-3135.201209001
Abstract:
The technology of the robot represents a national high-tech level and the degree of automation. It is helpful to develop the industry of service robots in China if we know the current situation and development trend of service robots research clearly. Recently, robotic cleaners and educational robots have been in great demand. Entertainment robots and surveillance robots are developed rapidly and the market expands quickly. Medical robots begin to enter the modern life and have played an important role in the modern surgery. To satisfy the great market and shorten the distance between China and developed countries, it is necessary to capture the development trend of the technology of service robots. R&D on service robots should focus on the integrated technologies on intelligence, modularization and network.
-
ZHOU Wu,XIE Yaoqin,TIAN Yangyang
2014,3(1):68-76, Doi: 10.12146/j.issn.2095-3135.201401007
Abstract:
The accurate contour delineation of the target and organs at risk (OAR) is essential in treatment planning for image guided radiation therapy. In clinical applications, the contour delineation is often done manually by clinicians, which may be accurate, but time-consuming and tedious for users. Although a lot of automatic contour delineation approaches have been proposed, few of them can fulfill the necessities of applications in terms of accuracy and efficiency. In this work, a novel approach of target delineation was proposed. Target delineation of OARs was achieved by using snake model and multiscale curve editing to obtain promising results. It allows users to quickly improve contours by a simple mouse click. Experimental results demonstrate the effectiveness of the proposed method for clinical target delineations.
-
2012,1(3):20-24, Doi: 10.12146/j.issn.2095-3135.201209004
Abstract:
Gene is the genetic material basis. All life phenomena, like disease and death, are related to Gene. Gene sequencing is a way to read life. With the development of new generation high-throughput sequencing technology, TB or more sequence data will be generated daily. It’s more difficult to interpret these big and complex data than to acquire them. Sequence data interpretation is a critical step in current biological research and has great practical significance. It’s a great challenge for current computer systems and computing models to store, process and analysis massive high throughput sequence data. With survey, especially from BGI (Beijing Genome Institute), the current status, problems and measures taken to process high throughput sequence data will be discussed. However, the challenge is too big to be solved unless more people in different fields work together in depth for a long term.
-
2012,1(1):48-54, Doi: 10.12146/j.issn.2095-3135.201205008
Abstract:
This paper gives a comprehensive introduction to the status of current machine translation research and technology, and analyzes the key problems to be resolved. Finally our idea of the future trends and prospects of machine translation are put forward.
-
ZHANG Yihong,XU Wenjing,YANG Kun
2014,3(5):19-27, Doi: 10.12146/j.issn.2095-3135.201405003
Abstract:
As an advanced biosensing strategy, the electrochemical biosensor is made up of the active sensing biomaterial and the electrochemical signal transducer, and is being widely applied in the fields of clinical medicine, drug and food analysis as well as the environmental monitoring. The electrochemical biosensor has the advantages of excellent specificity, high sensitivity and simplicity. This review focused on the fundamental principle of electrochemical biosensor, its classification and the biomedical applications. The prospect of the electrochemical biosensors was outlined as well.
-
2017,6(3):29-40, Doi: 10.12146/j.issn.2095-3135.201703003
Abstract:
Automatic drive is an important application field of artificial intelligence. In this paper, a novel training strategy for self-driving vehicles was investigated based on the deep reinforcement learning model. The proposed method involves a Q-learning algorithm with filtered experience replay and pre-training with experiences from professional drivers, which accelerates the training process due to reduced exploration spaces. By resampling the input state after clustering, generalization ability of the strategy can be improved due to the individual and independent distribution of the samples. Experimental results show that, in comparison with conventional neural fitted Q-iteration algorithm, the training efficiency and controlling stability can be improved more than 90% and 30% respectively by the proposed approach. Experimental results with more complex testing tracks show that, average travel distance can be improved more than 70% in comparison with the Q-learning algorithm by the proposed method.
-
2012,1(1):6-14, Doi: 10.12146/j.issn.2095-3135.201205002
Abstract:
With the increasing concerns of global warming and resource constraints, electric vehicles (EVs) have made great progress during the past decade. The electric driving system of EVs has dinstinct advantages, such as quick response, easy measurement , and precise control of motor torque, available flexible driving architecture, and regenerative braking, etc. Such advantages can be used to improve the performance of vehicle dynamic control. This paper presents the recent research efforts on electric vehicle dynamic control in terms of parameters estimation and dyanmic control scheme and methodology, especially focusing on the tire-road friction estimaion , novel traction control methods. The lateral dynamic control including the electrical differential control, direct yaw moment control, and the integratin chassis cotrol is proposed. Several prospects for vehicle dynamic control are proposed.
-
2013,2(4):49-55, Doi: 10.12146/j.issn.2095-3135.201307009
Abstract:
Transcranial magnetic stimulation (TMS) is a non-invasive technique that can be used for brain studying and clinical therapy. Firstly, the technology feature and application of the TMS instrument were introduced. Then several TMS coil positioning methods were evaluated and several key problems about TMS coil positioning were discussed. The aim of this study was to propose a new method for TMS coil positioning. The new method combines three aspects of quantitative information including the brain scalp, brain anatomy and brain function and has great advantages and broad application prospects.
-
2012,1(3):66-71, Doi: 10.12146/j.issn.2095-3135.201209012
Abstract:
Hadoop job schedulers typically use a single resource abstraction and resources are allocated at the level of fixed-size partition of the nodes, called slots. These job schedulers ignore the different demands of jobs and fair allocation of multiple types of resources, leading to poor performance in throughput and average job completion time. This paper studies and implements a Muti-resource Fair Scheduler (MFS) in Hadoop. MFS adopts the idea of Dominant Resource Fairness (DRF). It uses a demand vector to describe demands for resources of a job and allocates resources to the job according to the demand vector. MFS uses resources more efficiently and satisfies multiple jobs with heterogeneous demands for resources. Experiment results show that MFS has higher throughput and shorter average job completion time compared to Hadoop slot-based Fair Scheduler and Capacity Scheduler.
-
HU Chao,SONG Shuang,YANG Wan-an,MENG Qing-hu,LI Bao-pu,ZENG De-wen,LI Xiao-xiao,ZHU Hong-mei
2012,1(1):105-113, Doi: 10.12146/j.issn.2095-3135.201205017
Abstract:
Wireless Capsule Endoscope (WCE) is a very promising tool for the examination of the gastrointestinal (GI) tract. However, there are some problems to be solved for the existed WCE, and one key problem is the accurate localization and tracking of the WCE. Among the possible localization methods, the magnet-based localization technique has its advantages: no need for power, not much space occupation, continuously tracking ability, and no negative effect. In this paper, we present the localization method for the magnet objective inside the WCE based on the magnetic sensor array outside the human body. Through the algorithm and system design we realize real time tracking of 3D position and 2D orientation of the magnet based on the magnetic dipole model. In order to overcome the interference of the human body movement, we propose the multi-magnets’ localization method; also, the 3D positioning and 3D orientation method is proposed, which can be used to make the 3D recovery of the GI tract and the accurate computation of the physiological tissue parameters. The real experiments show that the proposed localization system can run well and obtain the accuracy with 2~3mm for the magnet.
-
SHEN Yang,LING Tao,YAO Hui,LI Yan-ming,JIN Qiao-feng,ZHENG Hai-rong
2012,1(1):93-99, Doi: 10.12146/j.issn.2095-3135.201205015
Abstract:
For the advantages of noninvasive, real-time and quantitative detection, ultrasonic transient elastography has important clinical application value. This work investigates the transient elastography in a few ways and aims to design a transient imaging system. The Displacement tracking algorithm based on correlation techniques and the parabolic interpolation algorithm is proposed to improve the accuracy. A novel match filter is designed to convolute with the estimated displacement in the time direction to boost the SNR of the displacement for a better strain image mapping. The convoluted result shows the match filter can significantly improve the strain image quality and help getting more accurate Youngs modulus estimation. The Time Gain Compensation (TGC) circuit is designed to compensate the attenuated power of the ultrasound signal. And a modified polyacrylamide gel based tissue-mimicking phantom is also developed in this paper, both indentation testing and transient elastography are used to characterize the elastic properties of this phantom. The results are almost consistent with each other.
-
CHI Xue-bin,XIAO Hai-li,WANG Xiao-ning,CAO Rong-qiang,LU Sha-sha,ZHANG Hong-hai
2012,1(1):68-76, Doi: 10.12146/j.issn.2095-3135.201205011
Abstract:
This paper introduces the scientific computing grid, ScGrid, and it’s middleware SCE. ScGrid is built as one virtual supercomputer, integrating computing resource from more than 30 institutes. It provides unified,?easy to use and reliable scientific computing services. SCE is a lightweight grid middleware, which supports global job scheduling and unified data view. It provides multiple user interfaces including command line, grid portal and APIs. At present, ScGrid has been very successfully used in Chinese Academy of Sciences and widely accepted by more than 200 users.
-
2012,1(3):47-54, Doi: 10.12146/j.issn.2095-3135.201209009
Abstract:
With the rapid increase in numbers and scales of deep web sites on the Internet, search for data or information from deep web sites by submiting queries to and obtaining results from the backend databases has become a major means in information retrieval from the Web. This area has attracted many researchers to devote their efforts on development of technologies to make better use of information in th deep web. One challenge is searching for and integration of data from various databases in deep web. Since deep web is dominated by text data, research and development of technologies for text information retrieval from deep web have a broad application potential. In this paper, we review the state-of-the-art of deep web research in details and propose some future research directions.
-
ZHANG Hao-shi,WU Zhen-xing,TIAN Lan,YANG Lin,LI Guang-lin
2012,1(1):114-118, Doi: 10.12146/j.issn.2095-3135.201205018
Abstract:
Effectively reducing power line interference is always an important issue in electromyography (EMG) signal recordings and analysis. In this study, four commonly used de-noising methods, including digital notch, LMS based adaptive filter, Kalman filter and S transform, which may be suitable for the reduction of power line interference in real-time EMG recordings, were chosen and their performance in reducing the power line interference from EMG signal recordings were quantitatively analyzed and compared. The pilot results of this study showed that Kalman filter presented the best whole performance in attenuating power line interference from EMG signals and S transform de-noising method illustrated the best performance when the power line interference was severe.
-
LUO Li,YANG Chao,ZHAO Yu-bo,CAI Xiao-chuan
2012,1(1):84-88, Doi: 10.12146/j.issn.2095-3135.201205013
Abstract:
Several of the top ranked supercomputers are based on the hybrid architecture consisting of a large number of CPUs and GPUs. High performance has been obtained for problems with special structures, such as FFT-based imaging processing or N-body based particle calculations. However, for the class of problems described by partial differential equations (PDEs) discretized by finite difference (or other mesh based methods such as finite element) methods, obtaining even reasonably good performance on a CPU/GPU cluster is still a challenge. In this paper, we propose and test an hybrid algorithm which matches the architecture of the cluster. The scalability of the approach is implemented by a domain decomposition method, and the GPU performance is realized by using a smoothed aggregation based algebraic multigrid method. Incomplete factorization, which performs beautifully on CPU but poorly on GPU, is completely avoided in the approach. Numerical experiments are carried out by using up to 32 CPU/GPUs for solving PDE problems discretized by FDM with up to 32 millions unknowns.
-
2013,2(4):56-60, Doi: 10.12146/j.issn.2095-3135.201307010
Abstract:
Foot drop is the inability to voluntarily dorsiflex the ankle during the swing phase of gait and is usually caused by weakness and damages of the peroneal nerve. The consequences of the foot drop include the decreasing of gait quality, the limiting of mobility, the increasing of falling risk, and great increasing of energy expenditure during walking. Firstly biosignal sensors are used in the drop foot stimulator to detect foot movements. Then the surface drop foot stimulator produces a predefined stimulation profile to the peroneal nerve or tibialis anterial to elicit a dorsiflexion of the foot synchronized with the swing phase of gait to lift the foot. This paper reviewed the fundamentals and current researches of drop foot stimulators. Moreover, the development trends of the closed loop drop foot stimulator were also discussed in the paper.
-
2012,1(3):10-14, Doi: 10.12146/j.issn.2095-3135.201209002
Abstract:
Human action recognition acts as an important role in human machine interaction. This paper proposes a human body recognition method from depth image based on part size and position features. Random forest classifiers are trained with different parameters. Experimental results demonstrate the feasibility of proposed approach. Recognition accuracy is about 91% and the computation time is about 0.96 us per pixel.
-
Abstract:
Random Forests is an important ensemble learning method and it is widely used in data classification and nonparametric regression. In this paper, we review three main theoretical issues of random forests, i.e., the convergence theorem, the generalization error bound and the out-of-bag estimation. In the end, we present an improved Random Forests algorithm, which uses a feature weighting sampling method to sample a subset of features at each node in growing trees. The new method is suitable to solve classification problems of very high dimensional data.
-
Zheng Hongna, Zhu Yun, Wang LAN, Chen hui
Abstract:
In order to help the hearing loss children, we obtained hearing loss children’s fallible pronunciation texts and the confusing pronunciation text pairs form a good deal of hearing loss children’s audio pronunciation data. We designed a data-driven 3D talking head articulatory animation system, it was driven by the articulatory movements which were collected from a device called Electro-magnetic articulography (EMA) AG500, the system simulated Chinese articulation realistically. In that way, the hearing loss children can observe the speaker’s lips and tongue’s motions during the speaker pronouncing, which could help the hearing loss children train pronunciation and correct the fallible pronunciations. Finally, a perception test was applied to evaluate the system’s performance. The results showed that the 3D talking head system can animate both internal and external articulatory motions effectively. A modified CM model based synthesis method was used to generate the articulatory movements. The root mean square between the real articulatory movements and synthetic articulatory movements was used to measure the synthesis method, and an average value of RMS is 1.25 mm.
-
Rapid Detecting Method for Pseudosciaena Crocea Morphological Parameters Based on the Machine Vision
YU Xinjie,WU Xiongfei,Wang Jianping,CHEN Li,WANG Lei
2015,3(5):45-51, Doi: 10.12146/j.issn.2095-3135.201405006
Abstract:
Morphological parameter measurement of Pseudosciaena Crocea plays an important role in its genetic selection and quality improvement. In this paper, an automatic detecting system which can measure the Pseudosciaena Crocea morphological parameters such as weight, length and body width was developed based on the machine vision and weighing sensor technology. The system can automatically detect the external morphology parameters by the machine vision, and get weight parameters through the weighing sensor. The mean errors of dimensional measurement and weighting are 0.28% and 0.74% respectively, which shows that the developed system can completely meet the requirements of morphological parameter measurement for Pseudosciaena Crocea. It is a new effective method to the automatic detection of fish morphology parameters.
-
LIU Hengwei,LI Jianjun,XIE Xiaoyi,FANG Mou,WANG Li,HE Xiangming,OUYANG Minggao,LI Maogang
2012,4(1):51-59, Doi: 10.12146/j.issn.2095-3135.201501007
Abstract:
In this work the thermal behavior of the LiNi1/3Co1/3Mn1/3O2 cathode material for soft packed lithium-ion power batteries during charging and discharging at different C-rate were conducted using the ARC (accelerating rate calorimeter) to provide an adiabatic environment. The overall heat generated by the lithium-ion battery during use, is partly reversible and partly irreversible, due to entropy change and joule heating, respectively. It indicates that the heating generation of lithium-ion cell is decided by the C-rate of charge and discharge. The heat is smaller at low C-rate of charge and discharge. For example, the heating generation of battery increases 7.16℃ at 0.2C-rate and the entropy change heat is clearly embodied. The joule heating is more remarkable than the entropy change during charging and discharging at high C-rate. For instance, the heating generation of cell increased 25.63℃ at 1C-rate. The heat generation of charge is less than discharge at the same C-rate. The DC inter insistence of cell at the SOC (State of Charge) of 0 to 10% increases suddenly, so the heating generation power will reach its maximum in this period during discharge. It is valuable for the design of heat dissipation in lithium-ion battery thermal management.