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SCFSen: A Sensor Node for Regional Soil Carbon Flux Monitoring SCIE
期刊论文 | 2018 , 18 (11) | SENSORS
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Abstract :

Estimation of regional soil carbon flux is very important for the study of the global carbon cycle. The spatial heterogeneity of soil respiration prevents the actual status of regional soil carbon flux from being revealed by measurements of only one or a few spatial sampling positions, which are usually used by traditional studies for the limitation of measurement instruments, so measuring in many spatial positions is very necessary. However, the existing instruments are expensive and cannot communicate with each other, which prevents them from meeting the requirement of synchronous measurements in multiple positions. Therefore, we designed and implemented an instrument for soil carbon flux measuring based on dynamic chamber method, SCFSen, which can measure soil carbon flux and communicate with each other to construct a sensor network. In its working stage, a SCFSen node measures the concentration of carbon in the chamber with an infrared carbon dioxide sensor for certain times periodically, and then the changing rate of the measurements is calculated, which can be converted to the corresponding value of soil carbon flux in the position during the short period. A wireless sensor network system using SCFSens as soil carbon flux sensing nodes can carry out multi-position measurements synchronously, so as to obtain the spatial heterogeneity of soil respiration. Furthermore, the sustainability of such a wireless sensor network system makes the temporal variability of regional soil carbon flux can also be obtained. So SCFSen makes thorough monitoring and accurate estimation of regional soil carbon flux become more feasible.

Keyword :

spatial and temporal heterogeneity soil carbon flux measurement wireless sensor networks dynamic chamber method

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GB/T 7714 Wang, Guoying , Wu, Xiaoping , Mo, Lufeng et al. SCFSen: A Sensor Node for Regional Soil Carbon Flux Monitoring [J]. | SENSORS , 2018 , 18 (11) .
MLA Wang, Guoying et al. "SCFSen: A Sensor Node for Regional Soil Carbon Flux Monitoring" . | SENSORS 18 . 11 (2018) .
APA Wang, Guoying , Wu, Xiaoping , Mo, Lufeng , Zhao, Jizhong . SCFSen: A Sensor Node for Regional Soil Carbon Flux Monitoring . | SENSORS , 2018 , 18 (11) .
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Verifiable Smart Packaging with Passive RFID EI Scopus
期刊论文 | 2018 | IEEE Transactions on Mobile Computing
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Abstract :

Smart packaging adds sensing abilities to traditional packages. This paper investigates the possibility of using RF signals to test the internal status of packages and detect abnormal internal changes. Towards this goal, we design and implement a nondestructive package testing and verification system using commodity passive RFID systems, called Echoscope. Echoscope extracts unique features from the backscatter signals penetrating the internal space of a package and compares them with the previously collected features during the check-in phase. The use of backscatter signals guarantees that there is no difference in RF sources and the features reflecting the internal status will not be affected. Compared to other nondestructive testing methods such as X-ray and ultrasound, Echoscope is much cheaper and provides ubiquitous usage. Our experiments in practical environments show that Echoscope can achieve very high accuracy and is very sensitive to various types abnormal changes. IEEE

Keyword :

Backscatter signals Design and implements Internal changes Non destructive Nondestructive testing method RF signal Sensing abilities Verification systems

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GB/T 7714 WANG, GE , Han, Jinsong , Qian, Chen et al. Verifiable Smart Packaging with Passive RFID [J]. | IEEE Transactions on Mobile Computing , 2018 .
MLA WANG, GE et al. "Verifiable Smart Packaging with Passive RFID" . | IEEE Transactions on Mobile Computing (2018) .
APA WANG, GE , Han, Jinsong , Qian, Chen , Xi, Wei , Ding, Han , Jiang, Zhiping et al. Verifiable Smart Packaging with Passive RFID . | IEEE Transactions on Mobile Computing , 2018 .
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SALM: Smartphone-based Identity Authentication Using Lip Motion Characteristics EI CPCI-S Scopus
会议论文 | 2017 , 203-210 | IEEE International Conference on Smart Computing (SMARTCOMP)
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Abstract :

With rapid development and popularity, smartphones have been of importance in our daily life. Despite of its convenience in communication and computing, smartphones also lead potential security threats to users. Existing methods on smartphones for protecting user's privacy mainly depend on password or fingerprint based authentication. Most smartphone passwords are very simple and easy to guess or crack, and fingerprinting requires extra hardware and hence increases the price of smartphones. In this paper, we present a smartphone-based identity authentication method based on user's lip motion characteristics, called SALM, which can be used as an additional authentication with password. SALM extracts the feature of lip movements as the authentication token, which is unique for each user. We implement SALM using off-the-shelf smartphones and evaluate its performance via extensive experiments. The results show that the overall accuracy of user authentication using SALM (without password) is higher than 96%.

Keyword :

User Authentication Lip Contour Extraction Model Fitting Lip Motion Model

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GB/T 7714 Yuan, Yaoxuan , Zhao, Jizhong , Zhang, Zhe et al. SALM: Smartphone-based Identity Authentication Using Lip Motion Characteristics [C] . 2017 : 203-210 .
MLA Yuan, Yaoxuan et al. "SALM: Smartphone-based Identity Authentication Using Lip Motion Characteristics" . (2017) : 203-210 .
APA Yuan, Yaoxuan , Zhao, Jizhong , Zhang, Zhe , Xi, Wei , Qian, Chen , Zhang, Xiaobin et al. SALM: Smartphone-based Identity Authentication Using Lip Motion Characteristics . (2017) : 203-210 .
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RFIPad: Enabling Cost-efficient and Device-free In-air Handwriting using Passive Tags EI CPCI-S Scopus
会议论文 | 2017 , 447-457 | 37th IEEE International Conference on Distributed Computing Systems (ICDCS)
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Abstract :

An important function of smart environments is the ubiquitous access of computing devices. In public areas such as hospitals, libraries, and airports, people may want to interact with nearby computing systems to get information, such as directions to a hospital room, locations of books, and flight departure/ arrival information. Touch screen based displays and kiosks, which are commonly used today, may incur extra hardware cost or even possible germ and bacteria infection. This work provides a new solution: users can make queries and inputs by performing in-air handwriting to an array of passive RFID tags, named RFIPad. This input method does not require human hands to carry any device and hence is convenient for applications in public areas. Besides the mobile and contactless property, this system is a cost-efficient extension to current RFID systems: an existing reader can monitor multiple RFIPads while performing its regular applications such as identification and tracking. We implement a prototype of RFIPad using commercial off-the-shelf UHF RFID devices. Experimental results show that RFIPad achieves > 91% accuracy in recognizing basic touchscreen operations and English letters.

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GB/T 7714 Ding, Han , Qian, Chen , Han, Jinsong et al. RFIPad: Enabling Cost-efficient and Device-free In-air Handwriting using Passive Tags [C] . 2017 : 447-457 .
MLA Ding, Han et al. "RFIPad: Enabling Cost-efficient and Device-free In-air Handwriting using Passive Tags" . (2017) : 447-457 .
APA Ding, Han , Qian, Chen , Han, Jinsong , Wang, Ge , Xi, Wei , Zhao, Kun et al. RFIPad: Enabling Cost-efficient and Device-free In-air Handwriting using Passive Tags . (2017) : 447-457 .
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A natural scene text extraction method based on the maximum stable extremal region and stroke width transform EI Scopus CSCD PKU
期刊论文 | 2017 , 51 (1) , 135-140 | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University
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Abstract :

To extract text information effectively from natural scene image with complex background, multi-orientation perspective and multilingual languages, a scenario text extraction method based on maximum stable extremal region (MSER) and stroke width transform (SWT) is presented. The method combines the merits of MSER and SWT algorithms. It establishes text candidate regions by utilizing MSER algorithm to detect text regions, and SWT algorithm is used to calculate the text stroke width of candidate region to get its stroke width. According to the stroke width graph, the stroke-connected graph is established by using connected component labeling. Then the heuristic rules of stroke-connected graph are established to remove non-text candidate regions according to the stroke-connected graph. By using the geometrical feature analysis and the local adaptive window Otsu segmentation, the text in natural scene images can be extracted effectively. The text extraction accuracy, recall rate and comprehensive performance of this method are 0.74, 0.64 and 0.68, respectively. Simulation experiment shows that the method can achieve good robustness for complex background with multi-orientation perspective, various characters and font sizes, and it is suitable for variety of languages and fonts. © 2017, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

Keyword :

Complex background Comprehensive performance Connected component labeling Geometrical features Maximum stable extremal regions Natural scene images Stroke widths Text extraction

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GB/T 7714 Zhang, Guohe , Huang, Kai , Zhang, Bin et al. A natural scene text extraction method based on the maximum stable extremal region and stroke width transform [J]. | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2017 , 51 (1) : 135-140 .
MLA Zhang, Guohe et al. "A natural scene text extraction method based on the maximum stable extremal region and stroke width transform" . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University 51 . 1 (2017) : 135-140 .
APA Zhang, Guohe , Huang, Kai , Zhang, Bin , Fu, Huanhuan , Zhao, Jizhong . A natural scene text extraction method based on the maximum stable extremal region and stroke width transform . | Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University , 2017 , 51 (1) , 135-140 .
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Hardware Implementation for Real-Time Haze Removal EI SCIE Scopus
期刊论文 | 2017 , 25 (3) , 1188-1192 | IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS | IF: 1.744
SCOPUS Cited Count: 2
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Abstract :

Haze removal is useful in computational photography and computer vision applications. Although many haze removal algorithms have been proposed, their computational efficiency requires improvement. A real-time haze removal method is presented in this paper. The method is based on the concept of a dark channel prior. To enhance the haze removal performance, an approximate method to estimate the atmospheric light and transmission is employed. For embedded system applications, a hardware architecture to perform real-time haze removal is proposed. The hardware can achieve 116 MHz on Stratix FPGA. The simulation results indicate that the hardware is highly efficient and performs well. It obtains good image recovery results and satisfies the real-time requirement even for large images.

Keyword :

image processing Haze removal real-time

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GB/T 7714 Zhang, Bin , Zhao, Jizhong . Hardware Implementation for Real-Time Haze Removal [J]. | IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS , 2017 , 25 (3) : 1188-1192 .
MLA Zhang, Bin et al. "Hardware Implementation for Real-Time Haze Removal" . | IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS 25 . 3 (2017) : 1188-1192 .
APA Zhang, Bin , Zhao, Jizhong . Hardware Implementation for Real-Time Haze Removal . | IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS , 2017 , 25 (3) , 1188-1192 .
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Haze Removal Using the Difference-Structure-Preservation Prior EI SCIE Scopus
期刊论文 | 2017 , 26 (3) , 1063-1075 | IEEE TRANSACTIONS ON IMAGE PROCESSING | IF: 5.071
WoS CC Cited Count: 5 SCOPUS Cited Count: 8
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Abstract :

Fog cover is generally present in outdoor scenes, which limits the potential for efficient information extraction from images. In this paper, the goal of the developed algorithm is to obtain an optimal transmission map as well as to remove hazes from a single input image. To solve the problem, we meticulously analyze the optical model and recast the initial transmission map under an additional boundary prior. For better preservation of the results, the difference-structure-preservation dictionary could be learned, such that the local consistency features of the transmission map could be well preserved after coefficient shrinkage. Experimental results show that the method preserves the natural appearance of the image.

Keyword :

local depth consistency difference-structure-preservation Visibility restoration contrast restoration single image dehazing

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GB/T 7714 He, Linyuan , Zhao, Jizhong , Zheng, Nanning et al. Haze Removal Using the Difference-Structure-Preservation Prior [J]. | IEEE TRANSACTIONS ON IMAGE PROCESSING , 2017 , 26 (3) : 1063-1075 .
MLA He, Linyuan et al. "Haze Removal Using the Difference-Structure-Preservation Prior" . | IEEE TRANSACTIONS ON IMAGE PROCESSING 26 . 3 (2017) : 1063-1075 .
APA He, Linyuan , Zhao, Jizhong , Zheng, Nanning , Bi, Duyan . Haze Removal Using the Difference-Structure-Preservation Prior . | IEEE TRANSACTIONS ON IMAGE PROCESSING , 2017 , 26 (3) , 1063-1075 .
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Elementary Function Computing Method for Floating-Point Unit EI SCIE Scopus
期刊论文 | 2017 , 88 (3) , 311-321 | JOURNAL OF SIGNAL PROCESSING SYSTEMS FOR SIGNAL IMAGE AND VIDEO TECHNOLOGY | IF: 1.088
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

CORDIC is a simple algorithm that uses adders and shifters to compute elementary functions. CORDIC has wide applications because of its low resource consumption and simple hardware architecture. CORDIC traditionally dedicates calculation units only for integer or fixed-point number. Control scheme and structure are also complicated. In this paper, we propose a floating-point elementary function computing method combined with dedicated circuits and floating-point arithmetic components. The arithmetic components minimize hardware resource and enhance flexibility. Dedicated circuits improve computing speed and simplify hardware structure. The floating-point elementary function processor can be easily designed using the method described. And FPU can be modified to have the capability of elementary function computing. A double precision floating-point elementary function processor with a simple and flexible structure is designed. A single precision processor is implemented with an FPGA and synthesized with Synopsys Design Compiler. Synthesis and experimental results show that the processor can calculate all the common elementary functions. The processor has merits of simple structure and design, flexibility, and wide application range.

Keyword :

Elementary function CORDIC FPGA

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GB/T 7714 Zhang, Bin , Zhao, Jizhong . Elementary Function Computing Method for Floating-Point Unit [J]. | JOURNAL OF SIGNAL PROCESSING SYSTEMS FOR SIGNAL IMAGE AND VIDEO TECHNOLOGY , 2017 , 88 (3) : 311-321 .
MLA Zhang, Bin et al. "Elementary Function Computing Method for Floating-Point Unit" . | JOURNAL OF SIGNAL PROCESSING SYSTEMS FOR SIGNAL IMAGE AND VIDEO TECHNOLOGY 88 . 3 (2017) : 311-321 .
APA Zhang, Bin , Zhao, Jizhong . Elementary Function Computing Method for Floating-Point Unit . | JOURNAL OF SIGNAL PROCESSING SYSTEMS FOR SIGNAL IMAGE AND VIDEO TECHNOLOGY , 2017 , 88 (3) , 311-321 .
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VADS: Visual Attention Detection with a Smartphone EI CPCI-S Scopus
会议论文 | 2016 | 35th IEEE Annual International Conference on Computer Communications (IEEE INFOCOM)
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Identifying the object that attracts human visual attention is an essential function for automatic services in smart environments. However, existing solutions can compute the gaze direction without providing the distance to the target. In addition, most of them rely on special devices or infrastructure support. This paper explores the possibility of using a smartphone to detect the visual attention of a user. By applying the proposed VADS system, acquiring the location of the intended object only requires one simple action: gazing at the intended object and holding up the smartphone so that the object as well as user's face can be simultaneously captured by the front and rear cameras. We extend the current advances of computer vision to develop efficient algorithms to obtain the distance between the camera and user, the user's gaze direction, and the object's direction from camera. The object's location can then be computed by solving a trigonometric problem. VADS has been prototyped on commercial off-the-shelf (COTS) devices. Extensive evaluation results show that VADS achieves low error (about 1.5. in angle and 0.15m in distance for objects within 12m) as well as short latency. We believe that VADS enables a large variety of applications in smart environments.

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GB/T 7714 Jiang, Zhiping , Han, Jinsong , Qian, Chen et al. VADS: Visual Attention Detection with a Smartphone [C] . 2016 .
MLA Jiang, Zhiping et al. "VADS: Visual Attention Detection with a Smartphone" . (2016) .
APA Jiang, Zhiping , Han, Jinsong , Qian, Chen , Xi, Wei , Zhao, Kun , Ding, Han et al. VADS: Visual Attention Detection with a Smartphone . (2016) .
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NFV: Near Field Vibration Based Group Device Pairing CPCI-S Scopus
会议论文 | 2016 , 163 , 129-140 | 11th EAI International Conference on Collaborative Computing - Networking, Applications and Worksharing
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Abstract :

In this paper, we propose a group device pairing system called NFV to enable group communication using mobile device equipped with motion sensors. A group of people put their mobile devices on the table and wait for a secure connection. We propose a vibration-propagation based key delivery scheme to transmit a secure connection key among a group of trusted mobile devices. Based on this key, group users establish a confidential communication channel between their devices. NFV achieves group devices pairing without the complex operations needed in prior works. We implemented NFV using off- the-shelf Android smartphones. The experimental results shows the efficiency and security of our system.

Keyword :

Ad hoc group pairing Vibration channel Pulse-width modulation Accelerometer

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GB/T 7714 Jiang, Zhiping , Han, Jinsong , Xi, Wei et al. NFV: Near Field Vibration Based Group Device Pairing [C] . 2016 : 129-140 .
MLA Jiang, Zhiping et al. "NFV: Near Field Vibration Based Group Device Pairing" . (2016) : 129-140 .
APA Jiang, Zhiping , Han, Jinsong , Xi, Wei , Zhao, Jizhong . NFV: Near Field Vibration Based Group Device Pairing . (2016) : 129-140 .
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