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Energy-efficient identification in large-scale RFID systems with handheld reader

IEEE Transactions on Parallel and Distributed Systems 2014年第5期25卷 1211-1222页

作者： Zhu, Yanmin Jiang, Wenchao Zhang, Qian Guan, Haibing Department of Computer Science and Engineering Shanghai Jiao Tong University Shanghai Key Lab of Scalable Computing and Systems China Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong

Efficient identification of tags has been an essential operation for Radio Frequency IDentification (RFID) systems. In this paper, we consider the crucial problem of collecting all tags in a large-scale system through a handheld RFID reader. The reader has to move around due to the limited communication range of tags. We focus on the minimization of power consumption of the reader given the constraint on its movement distance. Two challenges must be addressed. First, the communication range of a tag is dependent on the reader. There is an intrinsic tradeoff between power saving and movement distance. Second, the number of sites at which the reader can collect tags can be numerous and the problem complexity is extremely high. We theoretically prove that the problem of minimizing the energy consumption of the reader is NP Complete (NPC). To solve the problem, we first analytically reveal that the time needed for reading a given number of tags is linearly proportional to the number of tags only. With this insight, we next propose an approach called ePath by constructing an energy-efficient candidate path and then incrementally pruning the path when the tag locations are given. We further relax the assumption on tag locations by extending ePath to exploit the tag distribution density knowledge only. Extensive simulations have been performed, and results show that our approach significantly reduces the power consumption of the reader comparing to an existing approach. © 1990-2012 IEEE.

关键词： Energy efficiency

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Mirages: Behavioral intercession in a mirror-based architecture

Mirages: Behavioral intercession in a mirror-based architect...

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2007 ACM SIGPLAN International Conference on Object-Oriented programming, Systems, Languages and Applications, OOPSLA - 2007 Dynamic Languages Symposium, DLS

作者： Mostinckx, Stijn Van Cutsem, Tom Timbermont, Stijn Tanter, Éric Programming Technology Lab. Vrije Universiteit Brussel Belgium Computer Science Dept. DCC/CWR University of Chile Chile

ISBN: (纸本)9781595938688

Mirror-based systems are object-oriented reflective architectures built around a set of design principles that lead to reflective APIs which foster a high degree of reusability, loose coupling with base-level objects and whose structure and design corresponds to the system being mirrored. However, support for behavioral intercession has been limited in contemporary mirror-based architectures, in spite of its many interesting applications. This is due to the fact that mirror-based architectures only support explicit reflection, while behavioral intercession requires implicit reflection. This work reconciles mirrors with behavioral intercession. We discuss the design of a mirror-based architecture with implicit mirrors that can be absorbed in the interpreter, and mirages, base objects whose semantics are defined by implicit mirrors. We describe and illustrate the integration of this reflective architecture for the distributed object-oriented programming language AmbientTalk. © 2007 ACM.

关键词： Mirrors

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Security goals assurance based on software active monitoring

Security goals assurance based on software active monitoring

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International Conference on Secure Software Integration and Reliability Improvement

作者： Zhao, Changzhi Dong, Wei Leucker, Martin Qi, Zhichang Department of Computer Science National University of Defense Technology Changsha 410073 China Institute of Software Technology and Programming Languages University of Lubeck Germany

ISBN: (纸本)9780769544533

Access control is a vital security mechanism in today's operating systems and the security policies dictating the security relevant behaviors is lengthy and complex for example in Security-Enhanced Linux (SELinux). It is extremely difficult to verify the consistency between the security policies and the security goals desired by applications. In this paper we present how to predict whether the information flow security goal is violated or not during runtime how to generate the corresponding control actions on-line when divergence is detected and how to apply these actions in time based on software active monitoring technique. The symbolic security information flow model of SElinux is generated from a formalization of the access control mechanism which can be used to generate the N-step ahead projection of the future behavior. Information flow security goals are expressed in linear temporal logic (LTL) which provides clear description of the objectives desired by applications. Anticipatory monitor is generated from LTL formula automatically. We consider an on-line scheme where after the occurrence of an event, the next control action is determined on the basis of the N-step ahead projection of the future behavior. This procedure is repeated after the occurrence of next security relevant event. Thus a closed-loop system is generated that all behavior sequences will satisfy the security goals. © 2011 IEEE.

关键词： Access control

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An Indoor Environment Sensing and Localization System via mmWave Phased Array

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Journal of Communications and Information Networks 2022年第4期7卷 383-393页

作者： Yifei Sun Jie Li Tong Zhang Rui Wang Xiaohui Peng Xiao Han Haisheng Tan Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China Department of Computer Science the University of Hong KongHong Kong 999077China Huawei Technologies Co. Ltd.Shenzhen 518129China LINKE Lab School of Computer Science and Technologythe University of Science and Technology of ChinaHefei 230026China

In this paper,an indoor layout sensing and localization system with testbed in the 60-GHz millimeter wave(mmWave)band,named mmReality,is *** mmReality system consists of one transmitter and one mobile receiver,both with a phased array and a single radio frequency(RF)*** reconstruct the room layout,the pilot signal is delivered from the transmitter to the receiver via different pairs of transmission and receiving beams,so that multipath signals in all directions can be *** spatial smoothing and the two-dimensional multiple signal classification(MUSIC)algorithm are applied to detect the angle-of-departures(AoDs)and angle-of-arrivals(AoAs)of propagation ***,the technique of multi-carrier ranging is adopted to measure the path ***,with the measurements of the receiver in different locations of the room,the receiver and virtual transmitters can be pinpointed to reconstruct the room *** show that the reconstructed room layout can be utilized to localize a mobile device via the AoA spectrum.

关键词： millimeter wave indoor sensing and localization MUSIC algorithm multi-input multi output(MIMO) room layout integrated sensing and communication(ISAC) environment sensing orthogonal frequency division multiplexing(OFDM)

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TouchPower: Interaction-based power transfer for power-as-needed devices

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Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies 2017年第3期1卷 1-20页

作者： Zhang, Tengxiang Yi, Xin Yu, Chun Wang, Yuntao Becker, Nicholas Shi, Yuanchun Tsinghua National Laboratory for Information Science and Technology Computer Science and Technology Department Tsinghua University China Beijing Key Lab of Networked Multimedia Computer Science and Technology Department Tsinghua University China Global Innovation eXchange Institute Computer Science and Technology Department Tsinghua University China Electrical Engineering Department University of Washington United States

The trend toward ubiquitous deployment of electronic devices demands novel low maintenance power schemes to decrease the burden of maintaining such a large number of devices. In this paper, we propose Interaction-based Power Transfer (IPT): a novel power scheme for power-as-needed devices (i.e., devices that only require power during interaction). IPT allows for the removal of built-in batteries on these devices, and to instead be powered up through direct contact interaction with the user (e.g. gripping a mouse, holding a pen). We prove the concept and show the potential of IPT through our TouchPower prototype. TouchPower transfers on-body power to off-body power-as-needed devices through contact between electrodes on a glove worn by the user and those on the target device during the interaction process. We design TouchPower to automatically detect the contact topology at runtime to supply power accordingly, and place electrodes on the glove so that TouchPower is compatible with various interactions with different objects. We also show the methodology of placing electrodes on the device-end, and evaluate it on a mouse and a remote controller. Results show that during interaction, TouchPower is able to provide stable power supply to these devices with only a small sacrifice in regards to interaction naturalness. At last we demonstrate six applications of TouchPower, and discuss the limitations and potential of TouchPower and IPT systems. © 2017 Association for Computing Machinery.

关键词： Energy transfer

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AmbientTalk: Language support for mobile computing

AmbientTalk: Language support for mobile computing

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International Workshop on System Support for Future Mobile Computing Applications, FUMCA 2006

作者： Dedecker, Jessie Van Cutsem, Tom Mostinckx, Stijn De Meuter, Wolfgang D'Hondt, Theo Fund for Scientific Research Flanders Belgium Belgium Programming Technology Laboratory Department of Computer Science Vrije Universiteit Brussel Belgium

ISBN: (纸本)0769527299

An important aspect of system support for mobile computing involves alleviating the issues related to programming the underlying distributed system. Our approach to dealing with these issues is by means of programming language support. To this end, we have designed a high-level, distributed object-oriented programming language - called Ambient Talk - which has been designed specifically for mobile networks. We motivate the need for such dedicated language support based on the fundamental characteristics of mobile distributed systems. Subsequently, we describe the salient features of Ambient Talk with respect to distributed programming by means of an exemplar mobile computing application. © 2006 IEEE.

关键词： Ubiquitous computing

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DSANet: dilated spatial attention network for the detection of text, non-text and touching components in unconstrained handwritten documents

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Neural Computing and Applications 2024年第27期36卷 16959-16976页

作者： Bhowmik, Showmik Risat, Shaikh Sarkar, Bhaskar Research Lab Department of Computer Science and Engineering Ghani Khan Choudhury Institute of Engineering and Technology Malda India

Handwritten documents generated in our day-to-day office work, class room and other sectors of society carry vital information. Automatic processing of these documents is a pipeline of many challenging steps. The very first and crucial step is to identify text separately from the non-text as any OCR (optical character recognition) engine can only process the textual content. Separating text from non-text in unconstrained handwritten documents is a very complex task. In addition to other challenges, touching component is one of the major issues for text non-text separation in unconstrained handwritten documents. Detection of text, non-text along with touching component in such documents is an unexplored area of research. To address this issue, in this work, we develop a dilated spatial attention-based network for text, non-text and touching component detection. Additionally, in this work, we also prepare a realistic dataset for the said task. In the proposed dataset, the present model obtains overall accuracy of 87.85%. The performance of the present model is compared with seven feature-engineering-based methods and six deep learning-based methods. In most of the cases, the proposed model outperforms the comparing methods in the proposed dataset. The codes of our method are available here https://***/Showmik-Bhowmik/DSANet-Dilated-Spatial-Attention-.git. © The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature 2024.

关键词： Deep learning

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GPGPU-based randomized visual secret sharing (GRVSS) for grayscale and colour images

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International Journal of computers and Applications 2022年第6期44卷 552-560页

作者： Holla, Raviraja Mhala, Nikhil C. Pais, Alwyn R. Information Security Research Lab Department of Computer Science and Engg National Institute of Technology Karnataka Surathkal India

Visual Secret Sharing (VSS) is a technique used for sharing secret images between users. The existing VSS schemes reconstruct the original secret image as a halftone image with only a 50% contrast. The Randomized Visual Secret Sharing (RVSS) scheme overcomes the disadvantages of existing VSS schemes. Although RVSS extracts the secret image with better contrast, it is computationally expensive. This paper proposes a General Purpose Graphics Processing Unit (GPGPU)-based Randomized Visual Secret Sharing (GRVSS) technique that leverages data parallelism in the RVSS pipeline. The performance of the GRVSS is compared with the RVSS in a generic and PARAM Shavak supercomputer architecture. The GRVSS outperforms the RVSS in both architectures. © 2020 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Graphics processing unit

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Transactional programming in a multi-core environment 07

Transactional programming in a multi-core environment

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2007 ACM SIGPLAN Symposium on Principles and Practice of Parallel programming, PPoPP'07

作者： Adl-Tabatabai, Ali-Reza Kozyrakis, Christos Saha, Bratin Programming Systems Lab. Microprocessor Technology Lab. Intel Corporation Computer Systems Lab. Electrical Engineering Department Stanford University

ISBN: (纸本)1595936025

With single thread performance starting to plateau, HW architects have turned to chip level multiprocessing (CMP) to increase processing power. All major microprocessor companies are aggressively shipping multi-core products in the mainstream computing market. Moore's law will largely be used to increase HW thread-level parallelism through higher core counts in a CMP environment. CMPs bring new challenges into the design of the software system stack. In this tutorial, we talk about the shift to multi-core processors and the programming implications. In particular, we focus on transactional programming. Transactions have emerged as a promising alternative to lock-based synchronization that eliminates many of the problems associated with lock-based synchronization. We discuss the design of both hardware and software transactional memory and quantify the tradeoffs between the different design points. We show how to extend the Java and C languages with transactional constructs, and how to integrate transactions with compiler optimizations and the language runtime (e.g., memory manager and garbage collection).

关键词： computer programming

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Towards unified system modeling with the ModelicaML UML profile

Towards unified system modeling with the ModelicaML UML prof...

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1st International Workshop on Equation-Based Object-Oriented Languages and Tools, EOOLT 2007 - In Conjunction with the ECOOP 2007 Conference

作者： Pop, Adrian Akhvlediani, David Fritzson, Peter Programming Environments Lab Department of Computer and Information Science Linköping University SE-581 83 Linköping Sweden

In order to support the development of complex products, modeling tools and processes need to support co-design of software and hardware in an integrated way. Modelica is the major object-oriented mathematical modeling language for component-oriented modeling of complex physical systems and UML is the dominant graphical modeling notation for software. In this paper we propose ModelicaML UML profile as an integration of Modelica and UML. The profile combines the major UML diagrams with Modelica graphic connection diagrams and is based on the System Modeling Language (SysML) profile.

关键词： Unified Modeling Language

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