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检索条件"机构=Key Laboratory of Database and Parallel Computing. Harbin"

共 119 条记录，以下是31-40 订阅

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Wireless nerve: Invisible anti-theft system in wireless sensor network

Wireless nerve: Invisible anti-theft system in wireless sens...

引用

Int. Workshops on Web-Age Information Management, WAIM 2012: 1st Int. Workshop on GDMM 2012, 2nd Int. Wireless Sensor Networks Workshop, IWSN 2012, 1st Int. Workshop on MDSP 2012, 3rd Int. Workshop on USDM 2012, 4th Int. Workshop on XMLDM 2012

作者： Ren, Meirui Duan, Jinsheng Qu, Hao Wang, Xinjing Du, Lei School of Computer Science and Technology Heilongjiang University Harbin 150080 China Key Laboratory of Database and Parallel Computing Heilongjiang Province Harbin 150001 China

ISBN: (纸本)9783642330490

There are limitations in traditional anti-theft technologies. All the technologies have a common ground, that is: the devices are exposed to the space, also easily found and destroyed by adversaries. This paper demonstrates a Hidden Anti-theft System (HAS) based on wireless sensor network. The sensors can be hidden in walls and furniture. The intruder influences the transmitting link, and RSSI of the link changes. According to the changes, the system can detect the movement in monitoring area, and keep invisible. HAS is applied in indoor environment. Experiment results show that HAS achieves very low false positive and no false negative. © 2012 Springer-Verlag.

关键词： Wireless sensor networks

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Research on parallel Algorithms of Uncertain Combinational Coding 10

Research on Parallel Algorithms of Uncertain Combinational C...

引用

10th IEEE Joint International Information Technology and Artificial Intelligence Conference, ITAIC 2022

作者： Song, Xuanting Lu, Jun College of Computer Science and Technology Heilongjiang University Harbin China Heilongjiang University Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin China

ISBN: (数字)9781665422079

ISBN: (纸本)9781665422079

In this era of rapid development of information science and technology, data coding technology has been widely used in multimedia, computer, communication and other fields. Non-deterministic combined coding is further explored in deterministic combined coding. It is a kind of lossless coding. In combinatorial mathematics, the operation of the combination number calculates the ordinal number of the sequence to be coded. On the basis of the deterministic combination coding, the adjacent identical elements are eliminated and processed separately, which reduces the length of the ordinal number. At the same time, the reference sequence is encoded to further save space. However, the ordinal calculation of the non-deterministic combination coding is still a complicated process, and the coding speed is still slow. This article uses openMP technology to parallelize the ordinal calculation part of the non-deterministic combination coding. The running time of coded ordinal on the eight-core CPU is 23.38% of the original, which is 4.28 times optimized, and the overall coding time efficiency of the 17 segmented file instances has been improved about 2.94 times. It indicates the effectiveness of the parallel strategy in this article. Finally, this article analyzes the experimental results. © 2022 IEEE.

关键词： Number theory

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An effective top-k keyword search algorithm based on classified Steiner tree

An effective top-k keyword search algorithm based on classif...

引用

作者： Yang, Yan Tang, Mingzhu Zhong, Yingli Zhang, Zhaogong Guo, Longjiang School of Computer Science and Technology Heilongjiang University 150080 Harbin China Key Laboratory of Database and Parallel Computing Heilongjiang University 150080 Harbin China

ISBN: (纸本)9783642330490

keyword search has become one of hot topics in the field of information retrieval. It can provide users a simple and friendly interface. But the efficiency of some existing keyword search algorithms is low and there are some draws in sorting results. Most algorithms are suited for either unstructured data or structured data. This paper proposes a new kind of top-k keyword search algorithm. No matter the data is unstructured, semi-structured or structured, the algorithm is always effective. It introduces the concept of neighbor sets of nodes and uses set join algorithm to narrow the search space. We also propose the definition of classified Steiner tree, which can reduce the draw phenomenon in results. In addition, the algorithms can output the results of the classified Steiner tree at the same time of computing.them. So it can reduce the waiting time of the users and improve the efficiency of keywords search. © 2012 Springer-Verlag.

关键词： Efficiency

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Community Search in Spatial Uncertain Network

Community Search in Spatial Uncertain Network

引用

2021 Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021

作者： Zhang, Wenqian Zhong, Yingli Yang, Yan School of Computer Science Technology Heilongjiang University Harbin150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin150080 China

Community search is to explore valuable target community structure from a large social network. In real community, every point has a geographic location information, and many edges are uncertain. Such a network is called spatial uncertain network. In order to meet the existing needs, this paper studies the community search in the spatial uncertain network so that the searched communities can be relatively close in the geographical location and the relationship between each other is also very close. Based on the spatial uncertain graph, this paper proposes K-R-τ community, and proposes a linear algorithm and a two-dimensional algorithm for community search in the spatial uncertain network. A large number of experiments are carried out on several real datasets, and the results show that the algorithm proposed in this paper is effective and accurate. © Published under licence by IOP Publishing Ltd.

关键词： Social networking (online)

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OMA: A multi-channel MAC protocol with opportunistic media access in wireless sensor networks

OMA: A multi-channel MAC protocol with opportunistic media a...

引用

International Conference on Mobile Ad-hoc and Sensor Networks

作者： Li, Jinbao Zhang, Desheng Guo, Longjiang School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9780769543154

To tackle control channel saturation problems, this paper proposes OMA, an asynchronous duty cycle based multi-channel MAC protocol with opportunistic media access for wireless sensor networks. By adopting opportunistic media access, OMA effectively alleviates, if not completely eliminates, control channel saturation problems. More importantly, OMA is fully distributed with no requirements of time synchronization or multi-radio. Therefore, OMA is very easy to be implemented in resource-constrained sensor nodes. Via the theoretical analysis, the opportunistic probability with which a node opportunistically access the control channel is obtained. To validate the effectiveness of opportunistic media access, extensive simulations and real testbed experiments were conducted. The simulation and experimental results show that when the number of channels is large or the network loads are heavy, OMA improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Sensor nodes

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Joint routing, scheduling and channel assignment in multi-power multi-radio wireless sensor networks

Joint routing, scheduling and channel assignment in multi-po...

引用

30th IEEE International Performance, computing.and Communications Conference, IPCCC 2011

作者： Li, Jinbao Guo, Xiaohang Guo, Longjiang School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9781467300100

Power control is a complex issue in routing since the increase of transmission power supplies more opportunities to select optimal routes due to the fact that more links are available. However, conversely, it also implies higher interference and hence decreases the performance of routing. Since multi-radio multi-channel schemes can efficiently mitigate interferences through allowing more concurrent transmissions, therefore, it is worth to investigate the routing scheme in Multi-Power Multi-Radio (MPMR) wireless sensor networks (WSNs). In this paper, we study the joint routing, scheduling, channel assignment and power control problem in MPMR WSNs, which is proven a NP-Hard problem. We first formulate the optimal routing problem as a linear programming problem. Subsequently, we develop a distributed routing protocol based on the random walk method which can efficiently decrease the computational complexity in large-scale WSNs by avoiding solving the linear programming problem. Theoretical analysis and simulations show that the routing based on MPMR can improve the data transmission efficiency and the proposed cross-layer routing scheme significantly reduces the energy consumption and the end-to-end transmission delay. © 2011 IEEE.

关键词： Wireless sensor networks

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OCO: A multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks

OCO: A multi-channel MAC protocol with opportunistic coopera...

引用

International Workshop on Wireless Network Algorithm and Theory

ISBN: (纸本)9780769543222

To handle the triple hidden terminal problems, this paper proposes OCO, an asynchronous multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks. By adopting opportunistic cooperation, OCO effectively alleviates, if not eliminates, the triple hidden terminal problems. More importantly, OCO is fully distributed with no requirements of time synchronization or multi-radio scheme, so it is easy to be implemented on the real sensor nodes. Via the theoretical analysis, the opportunistic probability that a node cooperates with its neighbor is obtained. To validate the effectiveness of opportunistic cooperation, extensive simulations and real testbed experiments were conducted. The simulation and experimental results show that when the number of channels is large or the network loads are heavy, OCO improves energy efficiency and throughput significantly compared with other works in the literature. © 2010 IEEE.

关键词： Sensor nodes

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DCM: A duty cycle based multi-channel MAC protocol for wireless sensor networks

DCM: A duty cycle based multi-channel MAC protocol for wirel...

引用

IET International Conference on Wireless Sensor Network 2010, IET-WSN 2010

ISBN: (纸本)9781849192392

Limitations of current multi-channel MAC protocols include requiring of strict time synchronization, existing large number of multi-channel hidden terminals, and lacking single-hop broadcast support and sleep mechanism, i.e. duty cycling. This paper proposes an asynchronous duty cycle based multichannel MAC protocol, called DCM, for wireless sensor networks. Instead of requiring time synchronization among nodes, DCM takes advantage of receiver-initiated cross channel handshake mechanism to make a channel reservation for data transmission, and employs receiver adjustment mechanism to tackle the problem of the loss of broadcasting data and to improve broadcast reliability. According to theoretical analysis using Queueing theory, this paper obtains the average number of available channels. The simulation and testbed experimental results show that DCM reduces the number of multi-channel hidden terminals effectively, and achieves significant improvement in network throughput with increasing benefit as traffic loads increase while maintaining higher energy efficiency.

关键词： Wireless sensor networks

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PSHCAR: A position-irrelevant scene-aware human complex activities recognizing algorithm on mobile phones 1

引用

4th International Conference of Pioneer Computer Scientists, Engineers and Educators, ICPCSEE 2018

作者： Jia, Boxuan Li, Jinbao Xu, Hui School of Computer Science and Technology Heilongjiang University HarbinHeilongjiang150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province HarbinHeilongjiang150080 China

ISBN: (数字)9789811322037

ISBN: (纸本)9789811322020

Recognizing human complex activities has become an essential topic in pervasive computing.research area. With the growing popularity of mobile phones, more and more studies have been dedicated to identifying human complex activities using mobile phones in recent years. However, previous works often restrain the position and orientation of cell phones which limit the applicability of their methods. To overcome this limitation, we propose a novel position-irrelevant activities identification method named PSHCAR, which efficiently utilize information from multiple sensors on smartphones. Moreover, besides commonly-used features such as accelerometer and gyroscope, PSHCAR also employ the knowledge about scenes of activities, which is helpful but ignored by previous works, to identify complex activities of mobile phone users. Comparative experiments show that our method performs better than several strong baselines on the task of human complex activities recognition. In conclusion, our method achieves state-of-the-art performance without any limitation on position or orientation of mobile phones. © Springer Nature Singapore Pte Ltd. 2018.

关键词： Ubiquitous computing

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M&M: A multi-channel MAC protocol with multiple channel reservation for wireless sensor networks

M&M: A multi-channel MAC protocol with multiple channel rese...

引用

International Conference on Cyber-Enabled Distributed computing.and Knowledge Discovery

作者： Li, Jinbao Zhang, Desheng School of Computer Science and Technology Heilongjiang University Harbin Heilongjiang 150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin Heilongjiang 150080 China

ISBN: (纸本)9780769542355

In this paper, a multi-channel MAC protocol, called M&M, with multiple channel reservation is proposed to tackle the channel conflict problem. M&M is fully distributed with no requirements of time synchronization or multi-radio, so it is very practical to implement M&M in resource-constrained sensor nodes. M&M can make nodes to choose one actually idle channel for communications from all assumed idle channels. Therefore, M&M can greatly alleviate, if not completely eliminate, packet collisions resulted by the channel conflict, and thus conserve more energy to prolong the lifetime of WSNs. To investigate the values of multiple channel reservation, extensive simulation and real testbed experiments are conducted. The results show that when the number of channels becomes larger or loads are heavy, M&M improves energy efficiency and throughput significantly. © 2010 IEEE.

关键词： Sensor nodes

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