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SSC:Gesture-based game for initial dementia examination

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第7期7卷 1253-1258页

作者： LIU Jun-fa CHEN Yi-qiang XIE Chen GAO wen Institute of Computing Technology Chinese Academy of Sciences Beijing 100080 China Graduate School of the Chinese Academy of Sciences Beijing 100080 China College of Software Technology Zhejiang University Hangzhou 310027 China

This paper presents a novel system assisting medical dementia examination in a joyful way: the object just needs to play a popular game SSC against the computer during the examination. The SSC game’s target is to detect the player’s reacting capability, which is related closely with dementia. Our system reaches this target with some advantages: there are no temporal and spatial constraints at all. There is no cost, and it can even improve people’s mental status. Hand talk technology and EHMM gesture recognition approach are employed to realize the human computer interface. Experiments showed that this system can evaluate people’s reacting capability effectively and is helpful for initial dementia examination.

关键词： Human computer interface Hand talk Dementia Reaction capability

Development and Application of an in Situ Penetrator for Rapid Strength Testing of Submarine Sediment

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Journal of Ocean University of China 2019年第2期18卷 328-338页

作者： ZHANG Minsheng WANG Zhenhao WANG Xiuhai wen Mingzheng HONG Bo School of Transportation Science and Engineering Beihang University Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of China

In marine engineering, the strength of a submarine sediment is an indispensable parameter for assessment of construction. In this study, a free-fall cone penetrator named IPen was developed to realize a rapid and efficient measurement of sediment strength. The equipment is characterized by modular design and self-contained data acquisition. It is equipped with an acceleration sensor, a water pressure sensor, and a piezocone penetration test(CPTu) probe. It is designed to be released from near seabed surface with a releaser and then fall freely to provide a higher penetration velocity. Its maximum working depth is approximately 2500 m and maximum penetration depth is approximately 3 m. To derive the correlation between penetration resistance and sediment strength, a calibrator was devised to determine the penetration-rate factor. In addition, the factor applicable to in situ test points was determined in laboratory experiments. In June 2016, the IPen was tested in situ in the South Yellow Sea, China, during a shared voyage funded by the National Science Foundation. Meanwhile, undisturbed column samples were collected for laboratory tests. Based on the in situ test results, it was demonstrated that the IPen could accurately record the working states of various sensors during the freely falling course. IPen test results reliably reflected the sediment strength at all the testing points when compared with laboratory calibration tests, in situ vane tests and penetration tests, laboratory penetration tests, and unconsolidated and undrained triaxial compression tests.

关键词： submarine sediment free-fall cone penetration test sediment strength the Yellow Sea penetration-rate factor

CM-Droid: Secure Container for Android Password Misuse Vulnerability

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Computers, Materials & Continua 2019年第4期59卷 181-198页

作者： wen Zhang Keyue Li Tianyang Li Shaozhang Niu Zhenguang Gao Beijing Key Lab of Intelligent Telecommunication Software and Multimedia Beijing University of Posts and TelecommunicationsBeijing100876China Department of Computer Science Framingham State University100 State StFraminghamMassachusettsMA 01702USA

Android applications are associated with a large amount of sensitive data,therefore application developers use encryption algorithms to provide user data encryption,authentication and data integrity ***,application developers do not have the knowledge of cryptography,thus the cryptographic algorithm may not be used *** a result,security vulnerabilities are *** on the previous studies,this paper summarizes the characteristics of password misuse vulnerability of Android application software,establishes an evaluation model to rate the security level of the risk of password misuse vulnerability and develops a repair strategy for password misuse *** on this basis,this paper designs and implements a secure container for Android application software password misuse vulnerability:CM-Droid.

关键词： Password misuse evaluation model secure container dynamic repair

Recent advances in imaging devices:image sensors and neuromorphic vision sensors

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Rare Metals 2024年第11期43卷 5487-5515页

作者： wen-Qiang Wu Chun-Feng Wang Su-Ting Han Cao-Feng Pan Institute of Microscale Optoelectronics College of Materials Science and EngineeringShenzhen UniversityShenzhen 518060China College of Electronics and Information Engineering Shenzhen UniversityShenzhen 518060China Institute of Atomic Manufacturing Beihang UniversityBeijing 100191China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China

Remarkable developments in image recognition technology trigger demands for more advanced imaging *** recent years,traditional image sensors,as the go-to imaging devices,have made substantial progress in their optoelectronic characteristics and ***,a new breed of imaging device with information processing capability,known as neuromorphic vision sensors,is developed by mimicking biological *** this review,we delve into the recent progress of imaging devices,specifically image sensors and neuromorphic vision *** review starts by introducing their core components,namely photodetectors and photonic synapses,while placing a strong emphasis on device structures,working mechanisms and key performance *** it proceeds to summarize the noteworthy achievements in both image sensors and neuromorphic vision sensors,including advancements in large-scale and highresolution imaging,filter-free multispectral recognition,polarization sensitivity,flexibility,hemispherical designs,and self-power supply of image sensors,as well as in neuromorphic imaging and data processing,environmental adaptation,and ultra-low power consumption of neuromorphic vision ***,the challenges and prospects that lie ahead in the ongoing development of imaging devices are addressed.

关键词： Imaging devices Photodetectors Photonic synapses Image sensors Neuromorphic vision sensors

Fluorinated Polyimide/POSS Hybrid Polymers with High Solubility and Low Dielectric Constant

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Chinese Journal of Polymer Science 2016年第11期34卷 1363-1372页

作者：汪称意 wen-tao Chen Chang Xu 赵晓燕 Jian Li School of Materials Science and Engineering Changzhou UniversityChangzhou 213164China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong UniversityXi'an 710049China

A series of fluorinated polyimide/POSS hybrid polymers（FPI-4-FPI-16） were prepared via a facile synthetic route using 2,2＇-bis（trifluoromethyl）benzidine, 4,4＇-oxydiphthalic dianhydride and monofunctional POSS as starting materials. The hybrid polymers showed excellent solubility and film formation ability. Flexible and robust hybrid films could be conveniently obtained via solution-casting. The hybrid films demonstrated low dielectric constants and high thermal stability. Their dielectric constants were in the range of 2.47-2.92 at 1 MHz measured for their capacitance, and were tunable and decreased with an increase of POSS content. Their 10% weight loss temperatures were in the range of 539-591 ℃ and the weight residual at 800 ℃ ranged from 48% to 53% in nitrogen atmosphere. These hybrid films also possessed good mechanical properties and hydrophobic characteristics. This work could provide a potential strategy for the preparation of fluorinated polyimide/POSS hybrid polymers.

关键词： dielectric facile tunable solubility hydrophobic starting ranged conveniently capacitance constants

Towards sparse sensor annotations:Uncertaintybased active transfer learning for airfoil flow field prediction

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Chinese Journal of Aeronautics 2024年第12期37卷 87-98页

作者： Yunyang ZHANG Xiaohu ZHENG Zhiqiang GONG wen YAO Xiaoyu ZHAO Defense Innovation Institute Chinese Academy of Military ScienceBeijing 100071China Intelligent Game and Decision Laboratory Beijing 100071China

Deep learning has been widely applied in surrogate modeling for airfoil flow field *** success of deep learning relies heavily on large-scale,high-quality labeled ***,acquiring labeled samples with complete annotations is prohibitively expensive,and the available annotations in practical engineering are often sparse due to limited *** leverage samples with sparse annotations,this paper proposes an uncertainty-based active transfer learning *** most valuable positions in the flow field are selected based on uncertainty for annotation,effectively improving prediction accuracy and reducing annotation *** method involves a novel active annotation based on synchronous quantile regression,which can mitigate the computational cost of query ***,a novel quantile levels-based consistency regularization is proposed to constrain the remaining unlabeled regions and further improve the model *** show that our method can significantly reduce prediction errors with only 1%extra annotations,and is a promising tool for achieving rapid and accurate flow field prediction.

关键词： Active transfer learning Uncertainty analysis Surrogate model Flow fields Sparse annotations

Improved certificateless multi-proxy signature

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The Journal of China Universities of Posts and Telecommunications 2012年第4期19卷 94-105,116页

作者： XU Jie SUN Hong-xiang wen Qiao-yan ZHANG Hua School of Science Beijing University of Posts and Telecommunications Beijing 100876 China State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Multi-proxy signature is a scheme that an original signer delegates his or her signing capability to a proxy group. In the scheme, only the cooperation of all proxy signers in the proxy group can create a signature on behalf of the original signer. Jin and wen firstly defined the formal security model of certificateless multi-proxy signature （CLMPS） and proposed a concrete CLMPS scheme. However, their construction model is inaccurate, the concrete signature scheme has has three problems： the definition of the strengthened security a security flaw, and the proof of the security is imperfect. With further consideration, a remedial strengthened security model is redefined, and an improved scheme is also proposed, which is existentially unforgeable against adaptively chosen-warrant, chosen-message and chosen-identity attacks in the random oracles. In this condition, the computational Diffie-Hellman （CDH） assumption is used to prove full security for our CLMPS scheme.

关键词： certificateless multi-proxy signature provable security bilinear map

Influence of disturbance degree on the propped excavation stability in sandy soil in Shenyang,China

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Underground Space 2023年第3期10卷 150-165页

作者： Jiachao Dong Chen Chen Manman Dong Bo Lu Yongping Guan wen Zhao School of Resources and Civil Engineering Northeastern UniversityShenyang 110819China Northeast Architectural Design&Research Institute Co.Ltd Shenyang 110003China Department of Engineering Management Changshu Institute of TechnologyChangshu 215500China Taizhou Transportation Investment Group Taizhou 318000China

The stability of deep excavation is often investigated through numerical ***,most constitutive models cannot take into account the influence of disturbance on soil response,especially for excavations in sandy *** this study,the conventional Dun-can–Chang constitutive model is modified based on the data obtained from a series of triaxial consolidated drained tests on medium coarse sand with different relative densities,where all input parameters in the model are correlated with the changes in relative density due to *** modified hyperbolic model is then implemented in the general-purpose finite element code,*** effi-ciency of the proposed constitutive mode is demonstrated by comparing with the experimental ***,a case study of a large-scale propped excavation for a subway station in Shenyang is analyzed through numerical calculations with the conventional Mohr–Cou-lomb model and the proposed hyperbolic model,and theoretical derivations based on the current technical code in *** is found that the proposed approach can provide reasonable estimations compared with field measurements with a maximum error of 28%for max-imum horizontal displacement of the solider pile and of 8%for maximum ground surface settlement,whereas the other techniques over-estimate the behaviour of deep excavation significantly by more than 90%.

关键词： Propped excavation Triaxial tests Constitutive model Disturbance degree Numerical analysis

A mini-review of advances in the study of the evolution of Perdix species

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Zoological Systematics 2015年第1期40卷 93-98页

作者： Long-Ying wen College of Life Sciences Leshan Normal University Key Laboratory of Colleges and Universities in Sichuan Province for Protecting Endangered Birds in the Southwest Mountains

The Northem Eurasia origin hypothesis is one key point in the evolutionary model. This indicates that species riginated in Northern Eurasia. Perdix, belonging to Phasianidae of Galliformes, is a valuable type of wildfowl widely distributed Northern Eurasia and contains three species. This mini-review discusses the taxonomic status, phylogeny, and origin of Perdix. Morphological and molecular evidence suggest that the three species, P hodgsoniae, P. dauuricae and P. perdix, form a monophyletic group and they should be classified as ＂pheasant＂ rather than ＂quail.＂ The current review also shows that results were affected by the methods selected for data analysis. A taxonomic category should contain as many species as possible, have a clear system history, remain evolutionarily stable, and lack adaptive radiation. Appropriate type, number and length of genes are important as molecular markers and out-group affects the bootstrap support value. P. hodgsoniae is located at the root of the phytogenetic tree and has the phenotype of ancestral Perdix. The genus Perdix may originate in the Qinghai-Tibet Plateau and expanded into high latitude areas, towards the northern plateau. This phylogenetic and evolutionary statement differs from the Eurasian origin hypothesis.

关键词： Perdix evolution Qinghai-Tibet Plateau.