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science china(information sciences) 2011年第1期54卷 38-50页

作者： zhang Ling1,zhang bo2 & zhang Yanping1 1 computer science college,Anhui university,Hefei 230039,china 2state key lab of intelligent technology & systems tsinghua national lab for information science & technology information science & technology college,computer science & technology,tsinghua university,beijing 100084,china 1. computer science college Anhui University Hefei 230039 China2. State Key Lab of Intelligent Technology & Systems tsinghua national lab for information science & technology information science & technology college Computer Science & Technology Tsinghua University Beijing 100084 China

From quotient space based granular computing theory we explore the fuzzy measures of fuzzy sets. Based on the structural analysis of fuzzy sets,we present an"isotropism"*** this assumption we achieved the following insights:(1)the uniqueness of a fuzzy measure being isotropic on a finite complete semi-ordered set;(2)the necessary and suffcient condition of the isomorphism for fuzzy measure functions in fuzzy mathematics;(3)the necessary and suffcient condition that fuzzy measures have fuzzy and granular monotonicity;(4)under a certain assumption,the analytic expression for fuzzy *** results clarify the relationship between fuzzy measures and granular computing,reveal the essence of fuzzy measures,and provide a simple way of constructing fuzzy measures.

关键词： quotient space fuzzy set fuzzy measure rough set structural analysis

Fuzzy tolerance quotient spaces and fuzzy subsets

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science china(information sciences) 2010年第4期53卷 704-714页

作者： zhang Ling1 & zhang bo2,3,4* 1computer science & technology college, Anhui university, Anhui 230039, china 2state key laboratory of intelligent technology and systems, beijing 100084, china 3tsinghua national laboratory of information science & technology, beijing 100084, china 4information science & technology college, computer science & technology department, tsinghua university, beijing 100084, china 1. computer science & technology college Anhui University Anhui 230039 China2. State Key Laboratory of Intelligent Technology and Systems Beijing 100084 China3. Tsinghua National Laboratory of Information Science & Technology Beijing 100084 China4. Information Science & Technology College Computer Science & Technology Department Tsinghua University Beijing 100084 China

The structure and characteristic of fuzzy subsets are discussed by using the concepts of granulation and hierarchy in quotient space theory. First, the equivalence relation based quotient space theory is extended to the fuzzy tolerance relation. Second, the isomorphism and its discriminant of fuzzy tolerance relations are discussed. Finally, by using the fuzzy tolerance relation to define the fuzzy subset, its properties are addressed. The main results are given below: (1) several equivalent statements of fuzzy tolerance relations; (2) the definition of isomorphism of fuzzy tolerance relations; (3) the isomorphic discriminant of fuzzy tolerance relations; (4) the definition and properties of fuzzy subsets based on the fuzzy tolerance relations; and (5) the necessary and sufficient condition of the isomorphism of fuzzy subsets. These results will help us further comprehend the concepts of fuzzy tolerance relations and fuzzy subsets.

关键词： Fuzzy tolerance relation quotient space isomorphism fuzzy subset

DNA computing model based on lab-on-a-chip and its application on solving the timetabling problem

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progress in Natural science:Materials International 2008年第5期18卷 633-637页

作者： Fengyue zhang a,1, bo Liu b,1, Wenbin Liu c, Qiang zhang d a department of Biomedical Engineering, School of Life science and technology, beijing Institute of technology, beijing 100081, china b Chinese Academy of Inspection and Quarantine, beijing 100029, china c college of computer science and Engineering, Wenzhou university, Wenzhou, Zhejiang 325027, china d Liaoning key laboratory of intelligent information processing, Dalian university, Dalian, Liangning 116622, china department of Biomedical Engineering School of Life Science and Technology Beijing Institute of Technology Beijing 100081 China Chinese Academy of Inspection and Quarantine Beijing 100029 China college of computer science and Engineering Wenzhou University Wenzhou Zhejiang 325027 China Liaoning key laboratory of intelligent information processing Dalian University Dalian Liangning 116622 China

The essential characteristic of DNA computation is its massive parallelism in obtaining and managing information. With the develop- ment of molecular biology technique, the eld of DNA computation has made a great progress. By using an advanced biochip technique, laboratory-on-a-chip, a new DNA computing model is presented in the paper to solve a simple timetabling problem, which is a special ver- sion of the optimization problems. It also plays an important role in education and other industries. With a simulated biological experiment, the result suggested that DNA computation with lab-on-a-chip has the potential to solve a real complex timetabling problem.

关键词： DNA computing Timetabling problem lab-on-a-chip

Log-Mining-Based Query Spelling Correction for Chinese Search Engines

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Log-Mining-Based Query Spelling Correction for Chinese Searc...

Giant negative electrocaloric effect measured by indirect method in X-ray irradiated p(VDF-TrFE)films

第四届全国信息检索与内容安全学术会议

作者： bo ZHOU Min zhang Shaoping MA Yiqun LIU Liyun rU state key laboratory of intelligent technology and systems tsinghua national laboratory for information science and technology department of computer science and technology,tsinghua university,beijing 100084,china

Query spelling correction is crucial to search engines for improving web search relevance and user experience. Additional difficulty is posed beyond traditional lexicon-based spelling correction,since there exist vast amount of out-of-lexicon but legitimate terms in ***,context sensitive techniques cannot work due to the short query *** recent studies concentrate on spelling correction of English ***,in Chinese search engines,queries contain more mixed types of terms and more complicated spelling error patterns as compared to those in English search *** this paper,we analyze the types and patterns of query spelling errors in Chinese search *** using language-dependent error models,we present a query spelling correction approach for Chinese search engines,in which knowledge extracted from search log is *** experiments performed on randomly sampled real search queries show that % precision and % recall have been achieved.

关键词： Spelling Correction Query Log Search Engine

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Journal of Materiomics 2024年第3期10卷 624-631页

作者： bo Li Bin Yang Hong zhang Jiajia zhang Qianjin Wang Weishu Liu department of Materials science and Engineering Southern University of Science and TechnologyShenzhenGuangdong 518055China Guangdong provincial key laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhenChina college of physics and Electronic information Yunnan Normal UniversityYunnan Kunming 650500China The science and technology on reliability physics and Application of Electronic Component laboratory China Electronic Product Reliability and Environmental Testing Research InstituteGuangzhou 510610China

Flexible solid-state cooling devices with high efficiency are attracted to ferroelectric polymers with excellent negative electrocaloric(EC)*** is challenging to obtain a large negative EC effect in ferroelectric polymers due to the lack of tunable techniques.A giant negative EC response was obtained in the poly(vinylidene fluoride-trifluoroethylene)copolymers(p(VDF-TrFE),70/30,in mole ratio)irra-diated with high-energy *** irradiated p(VDF-TrFE)films showed an adiabatic temperature change of-13.5 K at 40 MV/m under a dose of 5 Mrad(1 Mrad=10^(4) J/kg)obtained by the indirect *** significant negative EC effect is attributed to the enhancement of crystalline due to the entry of polymer molecules into the amorphous to crystalline structure and the reduction of heat ca-pacity due to the increase of *** addition,X-ray irradiation improves the dielectric coefficient from 15 to *** research indicates that irradiation can modify the negative EC properties of ferro-electric polymers for solid-state cooling.

关键词： Negative electrocaloric effects X-rays radiation p(VDF-TrFE)films

Understanding adversarial attacks on observations in deep reinforcement learning

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science china(information sciences) 2024年第5期67卷 69-83页

作者： You QIAOBEN Chengyang YING Xinning ZHOU Hang SU Jun ZHU bo zhang department of computer science and technology Beijing National Research Center for Information Science and Technology Tsinghua-Bosch Joint Center for Machine Learning Institute for Artificial Intelligence Tsinghua University peng Cheng laboratory

Deep reinforcement learning models are vulnerable to adversarial attacks that can decrease the cumulative expected reward of a victim by manipulating its observations. Despite the efficiency of previous optimization-based methods for generating adversarial noise in supervised learning, such methods might not achieve the lowest cumulative reward since they do not generally explore the environmental ***, a framework is provided to better understand the existing methods by reformulating the problem of adversarial attacks on reinforcement learning in the function space. The reformulation approach adopted herein generates an optimal adversary in the function space of targeted attacks, repelling them via a generic two-stage framework. In the first stage, a deceptive policy is trained by hacking the environment and discovering a set of trajectories routing to the lowest reward or the worst-case performance. Next, the adversary misleads the victim to imitate the deceptive policy by perturbing the observations. Compared to existing approaches, it is theoretically shown that our adversary is strong under an appropriate noise level. Extensive experiments demonstrate the superiority of the proposed method in terms of efficiency and effectiveness, achieving state-of-the-art performance in both Atari and MuJoCo environments.

关键词： deep learning reinforcement learning adversarial robustness adversarial attack

Noise-Tolerant ZNN-Based Data-Driven Iterative Learning Control for Discrete Nonaffine Nonlinear MIMO repetitive systems

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 344-361页

作者： Yunfeng Hu Chong zhang bo Wang Jing Zhao Xun Gong Jinwu Gao Hong Chen state key laboratory of Automotive Simulation and Control Jilin UniversityJilin UniversityChangchun 130025China college of Communication Engineering Jilin UniversityJilin UniversityChangchun 130025China department of Electromechanical Engineering University of MacaoMacao 999078China School of Artificial Intelligence Jilin UniversityChangchun 130012China IEEE college of Electronics and information Engineering Tongji UniversityShanghai 200092China

Aiming at the tracking problem of a class of discrete nonaffine nonlinear multi-input multi-output(MIMO) repetitive systems subjected to separable and nonseparable disturbances, a novel data-driven iterative learning control(ILC) scheme based on the zeroing neural networks(ZNNs) is proposed. First, the equivalent dynamic linearization data model is obtained by means of dynamic linearization technology, which exists theoretically in the iteration domain. Then, the iterative extended state observer(IESO) is developed to estimate the disturbance and the coupling between systems, and the decoupled dynamic linearization model is obtained for the purpose of controller synthesis. To solve the zero-seeking tracking problem with inherent tolerance of noise,an ILC based on noise-tolerant modified ZNN is proposed. The strict assumptions imposed on the initialization conditions of each iteration in the existing ILC methods can be absolutely removed with our method. In addition, theoretical analysis indicates that the modified ZNN can converge to the exact solution of the zero-seeking tracking problem. Finally, a generalized example and an application-oriented example are presented to verify the effectiveness and superiority of the proposed process.

关键词： Adaptive control control system synthesis data-driven iterative learning control neurocontroller nonlinear discrete time systems

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QBIoT:A Quantum Blockchain Framework for IoT with an Improved proof-of-Authority Consensus Algorithm and a public-key Quantum Signature

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computers, Materials & Continua 2024年第7期80卷 1727-1751页

作者： Ang Liu Qing zhang Shengwei Xu Huamin Feng Xiu-bo Chen Wen Liu Network and information Management Division Beijing Electronic Science and Technology InstituteBeijing100070China department of Cyberspace Security Beijing Electronic Science and Technology InstituteBeijing100070China information Security Institute Beijing Electronic Science and Technology InstituteBeijing100070China General Office Beijing Electronic Science and Technology InstituteBeijing100070China information Security Center State Key Laboratory of Networking and Switching TechnologyBeijing University of Posts and TelecommunicationsBeijing100876China

The Internet of Things(IoT)is a network system that connects physical devices through the Internet,allowing them to ***,IoT has become an integral part of our lives,offering convenience and smart ***,the growing number of IoT devices has brought about a corresponding increase in cybersecurity threats,such as device vulnerabilities,data privacy concerns,and network *** blockchain technology with IoT has proven to be a promising approach to enhance IoT ***,the emergence of quantum computing poses a significant challenge to the security of traditional classical cryptography used in blockchain,potentially exposing it to quantum *** support the growth of the IoT industry,mitigate quantum threats,and safeguard IoT data,this study proposes a robust blockchain solution for IoT that incorporates both classical and post-quantum security ***,we present the Quantum-Enhanced Blockchain Architecture for IoT(QBIoT)to ensure secure data sharing and integrity ***,we propose an improved proof of Authority consensus algorithm called“proof of Authority with random Election”(poArE),implemented within QBIoT for leader selection and new block ***,we develop a publickey quantum signature protocol for transaction verification in the ***,a comprehensive security analysis of QBIoT demonstrates its resilience against cyber threats from both classical and quantum *** summary,this research introduces an innovative quantum-enhanced blockchain solution to address quantum security concernswithin the realmof *** proposedQBIoT framework contributes to the ongoing development of quantum blockchain technology and offers valuable insights for future research on IoT security.

关键词： IoT quantum blockchain public-key quantum signature quantum hash function

Self-Driven photo-polarized Water Molecule-Triggered Graphene-Based photodetector

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research 2024年第2期2023卷 273-283页

作者： Shisheng Lin Chang Liu Xin Chen Yi zhang Hongtao Lin Xutao Yu Yujiao bo Yanghua Lu college of information science and Electronic Engineering Zhejiang UniversityHangzhou 310027P.R.China Hangzhou Gelanfeng technology Co.Ltd Hangzhou 310051P.R.China state key laboratory of Modern Optical Instrumentation Zhejang UniversityHangzhou 310027P.R.China key laboratory of Wide Bandgap Semiconductor Materials and Devices HCSemitek CorporationYiwu 322009P.R.China Smart Materials for Architecture research lab Innovation Center of Yangtze River DeltaZhejiang UniversityJiaxing 314100P.R.China

Flowing water can be used as an energy source for generators,providing a major part of the energy for daily ***,water is rarely used for information or electronic ***,we present the feasibility of a polarized liquid-triggered photodetector in which polarized water is sandwiched between graphene and a *** to the polarization and depolarization processes of water molecules driven by photogenerated carriers,a photo-sensitive current can be repeatedly produced,resulting in a high-performance *** response wavelength of the photodetector can be fine-tuned as a result of the free choice of semiconductors as there is no requirement of lattice match between graphene and the *** zero voltage bias,the responsivity and specific detectivity of Gr/NaCl(0.5 M)W/N-GaN reach values of 130.7 mA/W and 2.3×10^(9)Jones under 350 nm illumination,***,using a polar liquid photodetector can successfully read the photoplethysmography signals to produce accurate oxygen blood saturation and heart *** with the commercial pulse oximetry sensor,the average errors of oxygen saturation and heart rate in the designed photoplethysmography sensor are~1.9%and~2.1%,*** study reveals that water can be used as a high-performance photodetector in informative industries.

关键词： polarization polarized saturation