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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...

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

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)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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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...

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

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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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CTS: Combine temporal influence and spatial influence for time-aware POI recommendation 2nd

CTS: Combine temporal influence and spatial influence for ti...

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2nd International Conference on Young Computer Scientists, Engineers and Educators, ICYCSEE 2016

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

ISBN: (纸本)9789811020520

As location-based social network (LBSN) services become more popular in people’s lives, Point of Interest (POI) recommendation has become an important research *** recommendation is to recommend places where users have not visited before. There are two problems in POI recommendation: sparsity and precision. Most users only check-in a few POIs in an LBSN. To tackle the sparse problem in a certain extent, we compute the similarity between the check-in datasets of different times. For the precision problem, we incorporate temporal information and geographical information. The temporal information will influence how the user chooses and allow the user to visit different distance point on different day. The geographical information is also used as a control for points which are too far away from the user’s check-in data. Our experimental results on real life LBSN datasets show that the proposed approach outperforms the other POI recommendation methods substantially. © Springer Science+Business Media Singapore 2016.

关键词： Collaborative filtering

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parallel optimization computing in universal combinatorial coding

Parallel optimization computing in universal combinatorial c...

引用

2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering, MEIC 2014

作者： Gao, Tingting Lu, Jun Key Laboratory of Database and Parallel Computing Heilongjiang Province Harbin150080 China College of Computer Science and Technology East University of Heilongjiang Harbin China

ISBN: (纸本)9789462520424

Universal combinatorial coding derives from the combination principle and its core is ordinal calculation. The solution of ordinal is a process of computing permutation and combination values. But permutation and combination computing is very time-consuming. As a result, adopting optimized methods or parallel techniques to increase ordinal calculation efficiency is very necessary. parallel optimization algorithms of the ordinal in universal combinatorial coding are advanced based on CPU multi-core and multi-thread techniques in this paper, including prime splitting and unequal parallel algorithms. Firstly, the thesis simplifies the multiplication and division calculations of the ordinal parallel computing through prime splitting optimization. Secondly, the thesis analyzes the deficiency of equal parallel that the unbalanced computing time of each part will lead to inefficient parallel computing of the ordinal, and then proposes the unequal parallel algorithm to shorten the ordinal number calculation. The experiment results of prime splitting and unequal parallel algorithm proved that two parallel optimizations are better in improving the efficiency of ordinal computing. © 2014. The authors - Published by Atlantis Press.

关键词： parallel algorithms

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A novel data broadcast strategy for traffic information query in the VANETs

A novel data broadcast strategy for traffic information quer...

引用

14th International Conference on Web-Age Information Management, WAIM 2013

作者： Wang, Xinjing Guo, Longjiang Li, Jinbao Ren, Meirui School of Computer Science and Technology Heilongjiang University China Key Laboratory of Database and Parallel Computing Heilongjiang China

ISBN: (纸本)9783642385612

This paper proposes a data broadcast strategy for traffic information query. Traffic information query is an important application in VANETs. Real-time traffic information query makes users to select path in a short time. By this data broadcast strategy, traffic information query can be quick and accurate after data is broadcast and forwarded. According to the restricted condition in the strategy, the vehicles broadcast their packets, and update, combine-forward or drop the data after receiving them in VANETs. In this way, more vehicles can receive data from source region. This algorithm can reduce the redundant data and control the communication congestion effectively. This paper adopts NS2 and SUMO as simulation platform. Simulation results show that, data collision rate is no more than 30%, and information area coverage rate reaches more than 80% with the strategy proposed in this paper after setting proper parameters. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Vehicular ad hoc networks

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BIVD: Improved Side Adapter Network based on BiFormer 5

BIVD: Improved Side Adapter Network based on BiFormer

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5th Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2024

作者： Hu, Liyuan Lu, Jun Heilongjiang University College of Computer Science and Technology Harbin150080 China Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin150080 China

ISBN: (纸本)9798350374407

Currently, most open vocabulary models rely on CLIP (Contrastive Language-Image Pre-training) to classify masked regions, but CLIP models still have many drawbacks. The traditional transformer model is context aware through self attention, but this local context based mechanism is limited by the sequence length of information, it can also impact model effect. Inspired by the article BiFormer, This article replaces the traditional transformer model in the Side Adapter Network (SAN) model with a variant module BIVD block based on BiFormer blocks. This model follows the latest transformer model and extracts features using a four layer feature pyramid structure, For the reduced spatial resolution caused by patch merging, add a Visual-Decoder to reshape the visual vector sequence into a spatial feature map, and restore it to the original resolution through convolution and upsampling. This can enhance the extracted feature information through a feature pyramid without affecting the fusion with CLIP layer features. But the cost is increasing the cost of the model. This article was tested on 5 commonly used datasets and showed a stable improvement in accuracy. © 2024 IEEE.

关键词： BiFormer CLIP component side adapter Visual Decoder

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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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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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Double Loss Block Neural Architecture Search 10

Double Loss Block Neural Architecture Search

引用

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

作者： Liu, Yang Lu, Jun College of Computer Science and Technology Heilongjiang University Harbin150080 China Heilongjiang University Key Laboratory of Database and Parallel Computing of Heilongjiang Province Harbin150080 China

ISBN: (数字)9781665422079

ISBN: (纸本)9781665422079

Neural architecture search aims to automatically design network architectures by machines, which is expected to bring about a new revolution in machine learning. Despite high expectations, the effectiveness and efficiency of existing neural architecture search solutions are unclear, and the inefficiency of neural architecture search solutions is mainly attributed to inaccurate architecture evaluation. In this work, this paper divides the large search space of neural architecture search into multiple modules, effectively reducing the error caused by shared parameters to ensure that the candidate architectures in the modules are fully trained. By adopting a block search method, this paper can Evaluate all candidate architectures in a module, addressing the problem of inaccurate evaluation. In addition, high-quality data is necessary. Under the guidance of the teacher model, combined with the ground truth, the neural architecture search is supervised by the double loss function. Under the constraint of the same amount of computation, the method in this paper achieves 77.3% top-level accuracy on ImageNet., which is 1.0% higher than the efficient network EfficientNet-B0, and 0.3% higher than the DNA method without additional computation. Therefore, the double loss block neural architecture search model proposed in this paper significantly improves the effectiveness of neural architecture search. © 2022 IEEE.

关键词： Distillation

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