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QoS Requirement Generation and Algorithm Selection for Composite Service Based on Reference Vector

Journal of computer Science & technology 2009年第2期24卷 357-372页

作者：吴邦欲支志雄徐世杰顾明孙家广 School of Software Tsinghua University Key Laboratory for Information System Security Ministry of Education of China Department of Computer Science and Technology Tsinghua University

Under SOA （Service-Oriented Architecture）, composite service is formed by aggregating multiple component services together in a given workflow. One key criterion of this research topic is QoS composition. Most work on service composition mainly focuses on the algorithms about how to compose services according to assumed QoS, without considering where the required QoS comes from and the selection of user preferred composition algorithm among those with different computational cost and different selection results. In this paper, we propose to strengthen current service composition mechanism by generation of QoS requirement and its algorithm selection based on the QoS reference vectors which are calculated optimally from the existing individual services＇ QoS by registry to represent QoS overview about the best QoS, the worst （or most economical） QoS, or the average QoS of all composite services. To implement QoS requirement, which is determined according to QoS overview, this paper introduces two selection algorithms as two kinds of experiment examples, one aiming at the most accurate service selection and the other chasing for trade-off between selection cost and result. Experimental results show our mechanism can help the requester achieve his expected composite service with appropriate QoS requirement and customized selection algorithm.

关键词： service-oriented architecture service composition quality of services service selection

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INPUT-DEPENDENT STABILITY OF JOINT TORQUE CONTROL OF TENDON-DRIVEN ROBOT HANDS

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 1992年第2期39卷 96-104页

作者： KANEKO, M PAETSCH, W TOLLE, H Department of Computer Science and System Engineering Kyushu Institute of Technology Fukuoka Japan Electrical Engineering Department Technical University of Darmstadt Darmstadt Germany

This paper discusses the input-dependent stability observed during torque control experiments using the first joint of the Darmstadt-HAND. Friction and compliance existing in tendon-sheath drive systems introduce a hysteresis nonlinearity between the joint torque output and the actuator displacement. Although this transmission characteristic is close to the well-known backlash behavior of the gears situated between a motor and a load shaft, this hysteresis loop exhibits input-dependent characteristics in the backlash region of the transmission system. The observed input-dependent characteristic shows springlike behavior within a portion of the backlash region. Through precise experiments, we confirmed that there is a close relationships between the input-dependent backlash characteristics and the input-dependent stability. Based on these experiments, we describe the transmission characteristic using a simple model and explore the system stability by using the technique of the sinusoidal-input-describing-functions (SIDF). Finally, we show a nondimensional stability-criterion-map that successfully predicts the experimental results.

关键词： Stability Torque control Actuators Fingers Friction Robot kinematics Hysteresis Service robots Orbital robotics Power transmission

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Optimal Mode Decision Method for Interframe Prediction in H.264/AVC

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computers, Materials & Continua 2020年第12期65卷 2425-2439页

作者： Hongjin Zhu Honghui Fan Zhenqiu Shu Congzhe You Xiangjun Chen Qian Yu Pengzhen Gan College of Computer Engineering Jiangsu University of TechnologyChangzhou213001China Department of Technology Development Management System IntegratorYamagata990-2473Japan

Studies show that encoding technologies in H.264/AVC,including prediction and conversion,are essential ***,these technologies are more complicated than the MPEG-4,which is a standard method and widely adopted ***,the amount of calculation in H.264/AVC is significantly up-regulated compared to that of the *** the present study,it is intended to simplify the computational expenses in the international standard compression coding system H.264/AVC for moving *** prediction refers to the most feasible compression technology,taking up to 60%of the entire *** this regard,prediction error and motion vector information are proposed to simplify the computation of inter predictive coding *** the initial frame,motion compensation is performed in all target modes and then basic information is collected and *** the initial frame,motion compensation is performed only in the middle 8×8 modes,and the basic information amount *** order to evaluate the effectiveness of the proposed method and assess the motion image compression coding,four types of motion images,defined by the international telecommunication union(ITU),are *** on the obtained results,it is concluded that the developed method is capable of simplifying the calculation,while it is slightly affected by the inferior image quality and the amount of information.

关键词： Video compression prediction mode decision H.264/AVC interframe prediction

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Privacy-Preserving Relative Location Based Services for Mobile Users

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China Communications 2015年第5期12卷 152-161页

作者： Fei Ning Zhuang Yi GU Jingjing Cao Jiannong Yang Liang College of Computer Science and Technology Nanjing University of Aeronautics and Astronautics School of Computer Science & Technology Nanjing University of Posts & Telecommunications Department of Computing The Hong Kong Polytechnic University System Technology Lab STGIBM

Location-aware applications have been used widely with the assistance of the latest positioning features in Smart Phone such as GPS,AGPS,***,all the existing applications gather users' geographical data and transfer them into the pertinent information to give meaning and *** this kind of solutions,the user's privacy and security issues might be raised because the geographical location has to be exposed to the service provider.A novel and practical solution is proposed in this article to provide the relative location of two mobile users based on their WiFi scanned results without any additional *** is no privacy concern in this solution because end users will not collect and send any sensitive information to the *** solution adopts a Client/Server(C/S) architecture,where the mobile user as a client reports the ambient WiFi APs and the server calculates the distances based on the WiFi AP's topological relationships.A series of technologies are explored to improve the accuracy of the estimated distance and the corresponding algorithms are *** also prove the feasibility with the prototype of "Circle Your Friends" system(CYFS) on Android phone which lets the mobile user know the distance between him and his social network friends.

关键词： relative location privacy-preserv-ing CYFS

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Querying ontology using keywords and quantitatire restriction phrases

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Information technology Journal 2010年第1期9卷 67-78页

作者： Hasany, N. Jantan, A.B. Selamat, M.H.B. Saripan, M.I. Department of Computer and Communications System Engineering Faculty of Engineering University Putra Malaysia Malaysia Department of Computer Science and Information Technology University Putra Malaysia Malaysia

Many approaches for converting keyword queries to formal query languages are presented for natural language interfaces to ontologies. Some approaches present fixed formal query templates, so they lack in providing support with increasing number of words in the user query. Other approaches work on constructing Techniques are presented to perform operations by obtaining a reduced RDF graph but they limit the input to some type of resources so their complete complexity with all type of input resources is unknown. For formal query generation, we present a variable query template whose computation is facilitated by less complex and distributed RDF property and relation graphs. A prototype QuriOnto is developed to evaluate our design. The user can query QuriOnto with any number of words and resource types. Also, to the best of our knowledge, it is the first system that can handle quantitative restrictions with keyword queries. As QuriOnto has no support for semantic similarity at this time except for rdfs labels so its recall is low but high precision shows that the approach is promising for the generation of corresponding formal queries. © 2010 Asian Network for Scientific Information.

关键词： Ontology

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SOA-based framework for home and building automation systems (HBAS)

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International Journal of Smart Home 2014年第5期8卷 197-206页

作者： Perumal, Thinagaran Ramli, Abd Rahman Leong, Chui Yew Department of Computer Science Faculty of Computer Science and Information Technology Universiti Putra Malaysia Malaysia Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia

Home and building automation systems (HBAS) today are categorized by plethora of data formats, communication platforms and software services accessible via heterogeneous embedded devices. These heterogeneous embedded devices characterized a building into a data intensive entity, generating numerous data and complex control information, brings a much heavy load to the HBAS. Consequently, this leads to interoperation difficulties among those devices for information exchange and operation management. In this paper, a Service Oriented Architecture (SOA) based framework that leveraged by services is proposed to manage HBAS efficiently by reducing their workload during joint execution of tasks. The proposed framework consists of several layers dedicated for services interwoven by Event-Condition-Action (ECA) oriented decision mechanism for managing heterogeneous embedded devices. The proposed framework is viable and highly efficient to be deployed for HBAS with limited computing resources. © 2014 SERSC.

关键词： Interoperability

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Spatiotemporal Photonic Emulator of Potential-free Schrödinger Equation

arXiv

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arXiv 2025年

作者： Cao, Qian Zhang, Nianjia Chong, Andy Zhan, Qiwen School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology Shanghai200093 China Zhangjiang Laboratory Shanghai China University of Shanghai for Science and Technology Shanghai Key Laboratory of Modern Optical System Shanghai China Pusan National University Department of Physics Busan Korea Republic of Institute for Future Earth Pusan National University Busan46241 Korea Republic of Westlake Institute for Optoelectronics Hangzhou Fuyang311421 China Hiroshima University Hiroshima Higashihiroshima739-8526 Japan

Photonic quantum emulator utilizes photons to emulate the quantum physical behavior of a complex quantum system. Recent study in spatiotemporal optics has enriched the toolbox for designing and manipulating complex spatiotemporal optical wavepackets, bringing new opportunities in building such quantum emulators. In this work, we demonstrate a new type of photonic quantum emulator enabled by spatiotemporal localized wavepackets with spherical harmonic symmetry. The spatiotemporal field distribution of these wavepackets has the same distributions of the wavefunction solutions to the potential-free Schrödinger equation with two controllable quantum numbers. A series of such localized wavepackets are experimentally generated with their localized feature verified. These localized wavepackets can propagate invariantly in space-time like particles, forming a new type of photonic quantum emulator that may provide new insight in studying quantum physics and open up new applications in studying light-matter interactions and quantum optics. © 2025, CC BY.

关键词： Schrodinger equation

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Anomaly Detection using Machine Learning Techniques in Wireless Sensor Networks

Anomaly Detection using Machine Learning Techniques in Wirel...

引用

2020 International Conference on Mathematics and Data Science, ICMDS 2020

作者： Ifzarne, Samir Tabbaa, Hiba Hafidi, Imad Lamghari, Nidal Department of Computer System and Technology ENSA Khouribga Morocco

The number of Wireless sensor network (WSN) deployments have been growing so exponentially over the recent years. Due to their small size and cost-effective, WSN are attracting many industries to use them in various applications. Environmental monitoring, security of buildings and precision agriculture are few example among several other fields. However, WSN faces high security threats considering most of them are deployed in unattended nature and hostile environment. In the aim of providing secure data processing in the WSN, many techniques are proposed to protect the data privacy while being transferred from the sensors to the base station. This work is focusing on attack detection which is an essential task to secure the network and the data. Anomaly detection is a key challenge in order to ensure the security and prevent malicious attacks in wireless sensor networks. Various machine learning techniques have been used by researchers these days to detect anomalies using offline learning algorithms. On the other hand online learning classifiers have not been thoroughly addressed in the literature. Our aim is to provide an intrusion detection model compatible with the characteristics of WSN. This model is built based on information gain ratio and the online Passive aggressive classifier. Firstly, the information gain ratio is used to select the relevant features of the sensor data. Secondly, the online Passive aggressive algorithm is trained to detect and classify different type of Deny of Service attacks. The experiment was conducted on a wireless sensor network-detection system (WSN-DS) dataset. The proposed model ID-GOPA results detection rate of 96% determining whether the network is in its normal mode or exposed to any type of attack. The detection accuracy is 86%, 68%, 63%, and 46% for scheduling, grayhole, flooding and blackhole attacks, respectively, in addition to 99% for normal traffic. These results shows that our model based on offline learning can be pr

关键词： Wireless sensor networks

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Temporal modeling of node mobility in mobile ad-hoc network

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Journal of Computing and Information technology 2010年第1期18卷 19-29页

作者： Singh, Jyoti Prakash Dutta, Paramartha Department of Information Technology Academy of Technology Aedconagar West Bengal India Department of Computer and System Sciences Visva-Bharati University West Bengal India

Ad-hoc network consists of a set of identical nodes that move freely and independently and communicate via wireless links. The most interesting feature of this network is that it does not require any predefined infrastructure or central administration and hence it is very suitable for establishing temporary communication links in emergency situations. This flexibility however is achieved at the price of communication link uncertainties due to frequent topology changes. In this article we describe the system dynamics using the proven concept of time series modeling. Specifically, we analyze variations of the number of neighbor nodes of a particular node over a geographical area and for given total number of nodes assuming different values of (i) the speeds of nodes, (ii) the transmission powers, (iii) sampling periods and (iv) different mobility patterns. We consider three different mobility models: (i) Gaussian mobility model, (ii) randomwalk mobility model and (iii) random way point mobility model. The number of neighbor nodes of a particular node behaves as a random variable for any mobility pattern. Through our analysis we find that the variation of the number of neighbor nodes can be well modeled by an autoregressive AR(p) model. The values of p evaluated for different scenarios are found to be in the range between 1 and 5. Moreover, we also investigate the relationship between the speed and the time of measurements, and the transmission range of a specific node under various mobility patterns.

关键词： Time series analysis

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Efficient Quantum Frequency Conversion of Ultra-Violet Single Photons from a Trapped Ytterbium Ion

arXiv

引用

arXiv 2025年

作者： Yu, Seungwoo Lee, Kyungmin Park, Sumin Kim, Kyunghye Goo, Junhong Park, Jeonghyun Kim, Taehyun Department of Computer Science and Engineering Seoul National University Seoul08826 Korea Republic of Automation and System Research Institute Seoul National University Seoul08826 Korea Republic of Inter-University Semiconductor Research Center Seoul National University Seoul08826 Korea Republic of NextQuantum Seoul National University Seoul08826 Korea Republic of Department of Physics and Astronomy Seoul National University Seoul08826 Korea Republic of Institute of Computer Technology Seoul National University Seoul08826 Korea Republic of Institute of Applied Physics Seoul National University Seoul08826 Korea Republic of

Ion trap system is a leading candidate for quantum network privileged by its long coherence time, high-fidelity gate operations, and the ion-photon entanglement that generates an ideal pair of a stationary memory qubit and a flying communication qubit. Rapid developments in nonlinear quantum frequency conversion techniques have enhanced the potential for constructing a trapped ion quantum network via optical fiber connections. The generation of long-distance entanglement has been demonstrated with ions such as Ca+ and Ba+, which emit photons in visible or near-infrared range naturally. On the other hand, as the qubit-native photons reside in ultra-violet (UV) spectrum, the Yb+ ion has not been considered as a strong competitor for telecommunication qubits despite extensive research on it. Here, we demonstrate an efficient difference-frequency conversion of UV photons, emitted from a trapped Yb+ ion, into a visible range. We provide experimental evidence that confirms the converted photons are radiated from the Yb+ ion. Our results provide a crucial step toward realizing a long-distance trapped ion quantum network based on Yb+ ions through quantum frequency conversion. © 2025, CC BY.

关键词： Qubits

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