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A new heuristic algorithm for the circular packing problem with equilibrium constraints

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science china({2. sciences) 2011年第8期54卷 1572-1584页

作者： liu jingfa 1,2.{2. gang 3 & GENG HuanTong 1 1 school of computer and software,nanjing University of information science & technology,nanjing {12.,china 2.Network information Center,nanjing University of information science & technology, nanjing 2.0044,china 3 school of Mathematics and Physics,nanjing University of information science & technology,nanjing {12.,china school of computer and {2. Nanjing University of Information Science & Technology Network information Center Nanjing University of Information Science & Technology school of Mathematics and Physics Nanjing University of Information Science & Tec

The circular packing problem with equilibrium constraints is an optimization problem about simplified satellite module layout design.A heuristic algorithm based on tabu search is put forward for solving this *** algorithm begins from a random initial configuration and applies the gradient method with an adaptive step length to search for the minimum energy *** jump out of the local minima and avoid the search doing repeated work,the algorithm adopts the strategy of tabu *** the process of tabu search,we improve the traditional neighboring solutions,tabu objects and the acceptance criteria of the current solution *** test two sets of benchmarks consisting of 11 representative instances from the current *** numerical results show that the proposed algorithm breaks the records in seven out of 11 instances,and obtains the optimal solutions for the other four instances.

关键词： equilibrium constraints packing problem heuristic algorithm tabu search layout optimization

Deterministic secure quantum communication without unitary operation based on high-dimensional entanglement swapping

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science china({2. sciences) 2012年第2期55卷 360-367页

作者： liu ZhiHao1,CHEN HanWu1,liu WenJie2.XU Juan1 & {2. ZhiQiang3 1school of computer science and Engineering,Southeast University,nanjing 2.1189,china 2.3} of computer and software,nanjing University of information science & technology,nanjing 2.0044,china 3College of information Engineering,Yangzhou University,Yangzhou 2.5009,china school of computer {2. and Engineering Southeast University school of computer and {2. Nanjing University of Information Science & Technology

By analysis of the basic properties of entanglement swapping of high-dimensional Bell states,a universal and general deterministic secure quantum communication(DSQC)protocol is proposed,in which unitary operation is not *** making use of the results of high-dimensional Bell measurement,the sender and the receiver can encode and decode the message respectively by performing the modular addition and *** mutually complementary bases are constructed;and according to the property of mutual complement,a method for checking security of the high-dimensional quantum channel is put *** common attack strategies are analyzed,and the corresponding error rates are *** the upper bound of the threshold of error rate is deduced.

关键词： deterministic secure quantum communication high-dimensional Bell state entanglement swap-ping high-dimensional Bell measurement

A heuristic algorithm for cube packing with time schedule

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science china({2. sciences) 2010年第1期53卷 18-29页

作者： li Wei1, HUANG WenQi2. JIANG DongChen1 & liu XiangLong1 1State Key Laboratory of {2. Development Environment, Beihang University, Beijing 100191, china 2.4} of computer science and technology, Huazhong University of science and technology, Wuhan 430074, china State Key Laboratory of software Development Environment Beihang University school of computer {2. and technology Huazhong University of Science and Technology

Packing problem has been proved to be an NP-hard problem. Many algorithms such as simulation annealing algorithm, genetic algorithm and other heuristic algorithms have been proposed to solve twodimensional and three-dimensional packing problem. To solve the cube packing problem with time schedule, this paper first introduces some concepts such as packing level, space distance and average neighbor birth order and then proposes a greedy algorithm. The algorithm tries every feasible corner greedily to calculate the space utilization, packing level, space distance, average neighbor birth order of this placement, and chooses the best placement according to these criteria. Theoretical analysis indicates that the time complexity of this algorithm is O(A2.2.2. 2.5). The experiments show that the average space utilization of non-guillotine cutting test cases is 98.81%, and the average space utilization of guillotine cutting test cases achieves 99.87%. Furthermore, optimal solutions of more than half cases are achieved by this algorithm. The experimental results show that this algorithm can solve the problem of cube packing with time schedule effectively and effciently.

关键词： cube packing problem time schedule packing level space distance average neighbor birth order

Fuzzing:Progress,Challenges,and Perspectives

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computers, Materials & Continua 2024年第1期78卷 1-29页

作者： Zhenhua Yu Zhengqi liu Xuya Cong Xiaobo li li Yin Institute of Systems Security and Control College of Computer Science and TechnologyXi'an University of Science and TechnologyXi'an710054China school of Mathematics and information {2. Baoji University of Arts and SciencesBaoji721013China Institute of Systems Engineering Macao University of Science and TechnologyTaipaMacaoChina

As one of the most effective techniques for finding software vulnerabilities,fuzzing has become a hot topic in software *** feeds potentially syntactically or semantically malformed test data to a target program to mine vulnerabilities and crash the *** recent years,considerable efforts have been dedicated by researchers and practitioners towards improving fuzzing,so there aremore and more methods and forms,whichmake it difficult to have a comprehensive understanding of the *** paper conducts a thorough survey of fuzzing,focusing on its general process,classification,common application scenarios,and some state-of-the-art techniques that have been introduced to improve its ***,this paper puts forward key research challenges and proposes possible future research directions that may provide new insights for researchers.

关键词： Fuzzing vulnerability software testing software security

A Secure Device Management Scheme with Audio-Based Location Distinction in IoT

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工程与科学中的计算机建模(英文) 2024年第1期138卷 939-956页

作者： Haifeng lin Xiangfeng liu Chen Chen Zhibo liu Dexin Zhao Yiwen Zhang Weizhuang li Mingsheng Cao College of Economics and Management Nanjing University of Aeronautics and AstronauticsNanjing211106China Chengdu Aircraft Industrial(Group)Co. Ltd.Chengdu610073China Academy of Military sciences of PLA Beijing100091China school of information and {2. Engineering University of Electronic Science and Technology of ChinaChengdu610054China Ningbo Web King technology Joint Stock Co. Ltd.Ningbo315000China The Network and Data Security Key Laboratory of Sichuan Province University of Electronic Science and Technology of ChinaChengdu610054China

Identifying a device and detecting a change in its position is critical for secure devices management in the Internet of Things(IoT).In this paper,a device management system is proposed to track the devices by using audio-based location distinction *** the proposed scheme,traditional cryptographic techniques,such as symmetric encryption algorithm,RSA-based signcryption scheme,and audio-based secure transmission,are utilized to provide authentication,non-repudiation,and confidentiality in the {2. interaction of the management ***,an audio-based location distinction method is designed to detect the position change of the ***,the audio frequency response(AFR)of several frequency points is utilized as a device *** device signature has the features as follows.(1)Hardware Signature:different pairs of speaker and microphone have different signatures;(2.Distance Signature:in the same direction,the signatures are different at different distances;and(3)Direction Signature:at the same distance,the signatures are different in different *** on the features above,amovement detection algorithmfor device identification and location distinction is ***,a secure communication protocol is also proposed by using traditional cryptographic techniques to provide integrity,authentication,and non-repudiation in the process of {2. interaction between devices,Access Points(APs),and *** experiments are conducted to evaluate the performance of the proposed *** experimental results show that the proposedmethod has a good performance in accuracy and energy consumption.

关键词： Acoustic hardware fingerprinting device management IoT location distinction

Proactive Caching at the Wireless Edge:A Novel Predictive User Popularity-Aware Approach

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computer Modeling in Engineering & {2.s 2024年第8期140卷 1997-2017页

作者： Yunye Wan Peng Chen Yunni Xia Yong Ma Dongge Zhu Xu Wang Hui liu Weiling li Xianhua Niu Lei Xu Yumin Dong College of computer science Chongqing UniversityChongqing400044China school of computer and {2. Engineering Xihua UniversityChengdu610039China school of computer and {2. Engineering Jiangxi Normal UniversityNanchang330022China Electric Power Research Institute of State Grid Ningxia Electric Power Co. Ltd.Yinchuan750002China College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing400030China school of computer {2. and technology Beijing Institute of TechnologyBeijing100083China school of computer {2. and technology Dongguan University of TechnologyDongguan523808China school of Emergency Management Xihua UniversityChengdu610039China College of computer and information {2. Chongqing Normal UniversityChongqing401331China

Mobile Edge Computing(MEC)is a promising technology that provides on-demand computing and efficient storage services as close to end users as *** an MEC environment,servers are deployed closer to mobile terminals to exploit storage infrastructure,improve content delivery efficiency,and enhance user ***,due to the limited capacity of edge servers,it remains a significant challenge to meet the changing,time-varying,and customized needs for highly diversified content of ***,techniques for caching content at the edge are becoming popular for addressing the above *** is capable of filling the communication gap between the users and content providers while relieving pressure on remote cloud ***,existing static caching strategies are still inefficient in handling the dynamics of the time-varying popularity of content and meeting users’demands for highly diversified entity *** address this challenge,we introduce a novel method for content caching over MEC,i.e.,*** synthesizes a content popularity prediction model,which takes users’stay time and their request traces as inputs,and a deep reinforcement learning model for yielding dynamic caching *** results demonstrate that PRIME,when tested upon the MovieLens 1M dataset for user request patterns and the Shanghai Telecom dataset for user mobility,outperforms its peers in terms of cache hit rates,transmission latency,and system cost.

关键词： Mobile edge computing content caching system average cost deep reinforcement learning collaborative mechanism

Analysis of the Spatio-Temporal Characteristics of Winter Surface Urban Heat Island: A Case Study in Beijing, china

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Journal of Earth science 2024年第5期35卷 1640-1653页

作者： Shanshan Lu Fujiang liu Yunshuang Ye Jiayu Tang Peng li Weihua lin Yan Guo Ruqiang Ma Jun Wang school of Geography and information Engineering China University of Geosciences Auto Navi software Co. Ltd. school of computer {2. China University of Geosciences Yantai Geological Survey of Coastal Resources Center

This study reveals the temporal and spatial evolution characteristics of the winter nighttime urban heat island(UHI) effect in the case of Beijing, china. The land surface temperature(LST) is retrieved by radiative transfer equation by using the remote sensing data from Landsat ETM+/Oli＿TIRS from 2.07 to {2.7 for the winter nighttime period, and LST is then divided by the mean-standard deviation method into different levels of thermal landscapes. A combination of the migration calculation of gravity center and multi-directional profile analysis is used to study the directional differentiation characteristics of LST and the migratory characteristics of the gravity center of UHI. Finally, the overall temporal and spatial evolution characteristics of winter nighttime surface urban heat island(SUHI) in Beijing are studied, and the possible reasons for the changes are discussed. Results show that Beijing ' s UHI effect first increased and subsequently decreased from 2.07 to {2.7. The winter heat island in the urban area developed from low-density agglomeration to high-density agglomeration to lowdensity diffusion. Additionally, the high-level thermal landscapes migrated to the southwest along with the city center of gravity, and the expansion rate is fastest in the southwest, which is directly linked to the changes in the urban construction land. Moreover, the overall spatial distribution of winter nighttime LST is high in the east and south and low in the west and north, and is influenced by topography, land cover, urbanization, anthropogenic heat, and other factors as well.

关键词： land surface temperature urban heat island spatio-temporal characteristics winter environmentgeology

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Knowledge Acquisition from ANSYS Analyzed Data for Driving Head of Hydraulic Drill

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Knowledge Acquisition from ANSYS Analyzed Data for Driving H...

2.10 International Colloquium on Computing,Communication, Control, and Management (CCCM2.10)

作者： Daohua liu school of {2. and information technology Xinyang Normal university Xinyang,china Jin li Network information Center Xinyang Normal university Xinyang,china

This paper mainly discusses how to obtain design knowledge from the finite element analyzed *** regard to one design problem,the orthogonal experiment table is established according to diverse values of design variables,and variables in each kind of experimental schemes are built by the entity model of Pro/Engineer software and then the entity model is analyzed by ADAMS in order to obtain design parameters which satisfy design *** data of different characteristics collected from the stress analysis and other relative computation data constitute a new two-dimensional form from which design knowledge is extracted by using the rough set *** method of knowledge acquisition is tested by the analysis of the data from driving head of hydraulic *** test shows that the method obtains three strong associate rules for the design of driving head,which is *** experiments prove that this method of knowledge acquisition is correct and effective and it can also be used as guidance for extracting design knowledge from other engineering analyzing software.

关键词： Knowledge acquisition ANSYS analyzed data Design for driving head of Drill Orthogonal experiment Rough set theory

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安全管理研究综述

计算机科学 2004年第8期31卷 1-4页

作者：姚键叶保留蔡圣闻袁卫忠茅兵黄皓谢立软件新技术国家重点实验室

本文提出了安全管理的三大目标:集成管理、综合管理和智能管理,综述了安全管理的模型、体系结构、产品和关键技术,强调了安全管理在安全领域的重要地位,指出了需要进一步研究的问题。

关键词：安全管理信息模型安全策略智能管理集成管理综合管理网络管理

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