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International Journal of Interactive Mobile Technologies 2017年第1期11卷 71-83页

作者： Allahham, Alaa Azmi Mohammed, Muamer N. Kadhim, Nassir Sallom Faculty of Computer Systems and Software Engineering University Malaysia Pahang Kuantan Pahang26300 Malaysia IBM Center of Excellence Kuantan Pahang26300 Malaysia

Mobile Ad-hoc Networks (MANETs) involved in many applications, whether smart or traditional and for both civilian and military uses, and that because of their special features, where it does not depend on any infrastructure during its working, as well as the nodes in MANETs have a freedom of movement with the ability to self-configure, in addition, to working as a router or client at the same time. Moreover, MANETs considered as an infrastructure less network, so the cost of this type of networks is less in comparison to other traditional networks. On the other hand, the routing considered one of most important challenges in MANETs due to the perpetual motion and randomness of the nodes that can causing a continuous change of the network topology and thus to all paths between nodes, where finding valid paths between the nodes is the core task of routing protocols. Recently, it has been argued that the traditional layered architecture is ineffective to deal with receiving signal strength related problems. In an effort to improve the performance of MANETs, there has been increased in protocols that rely on cross-layer interaction between different layers. In this paper, a Cross-layer design among Network, MAC and Physical layers based on Threshold Multipath Routing Protocol (CTMRP) is proposed. The CTMRP is designed for decision maker based on threshold value of average paths signal for efficient transmission of the Text, image, audio and video as well as sending the data via multiple paths, which mitigate the negatives effects causes from forcing the nodes to send the data via single. The Route Discovery Delay, Number of RREQ Messages, Number of RREP Messages, End-to-End Delay, Packet Delivery Ratio (PDR), and Throughput were selected as the main performance evaluation metrics. The results show that the proposed algorithm has better performance and lead to increase stability of transmission link.

关键词： Mobile ad hoc networks

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A balanced decomposition approach to real-time visualization of large vector maps in CyberGIS

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Frontiers of Computer Science 2015年第3期9卷 442-455页

作者： Mingqiang GUO Ying HUANG Zhong XIE Faculty of Information and Engineering China University of Geosciences Wuhan 430074 China Geographic Information Systems Software and Application Project Research Center of the Educational Department China University of Geosciences Wuhan 430074 China

With the dramatic development of spatial data in- frastructure, CyberGIS has become significant for geospatial data sharing. Due to the large number of concurrent users and large volume of vector data, CyberGIS faces a great chal- lenge in how to improve performance. The real-time visual- ization of vector maps is the most common function in Cyber- GIS applications, and it is time-consuming especially when the data volume becomes large. So, how to improve the effi- ciency of visualization of large vector maps is still a signif- icant research direction for GIScience scientists. In this re- search, we review the existing three optimization strategies, and determine that the third category strategy （i.e., parallel optimization） is appropriate for the real-time visualization of large vector maps. One of the key issues of parallel optimiza- tion is how to decompose the real-time visualization tasks into balanced sub tasks while taking into consideration the spatial heterogeneous characteristics. We put forward some rules that the decomposition should conform to, and design a real-time visualization framework for large vector maps. We focus on a balanced decomposition approach that can assure efficiency and effectiveness. Considering the spatial hetero- geneous characteristic of vector data, we use a ＂horizontal grid, vertical multistage＂ approach to construct a spatial point distribution information grid. The load balancer analyzes the spatial characteristics of the map requests and decomposes the real-time viewshed into multiple balanced sub ***, all the sub viewsheds are distributed to multiple server nodes to be executed in parallel, so as to improve the real- time visualization efficiency of large vector maps. A group of experiments have been conducted by us. The analysis results demonstrate that the approach proposed in this research has the ability of balanced decomposition, and it is efficient and effective for all geometry types of vector data.

关键词： real-time visualization large vector map bal-anced decomposition CyberGIS load balance

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Wi-Fi fingerprint localization using RSSI-probability radio map

Wi-Fi fingerprint localization using RSSI-probability radio ...

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2015 5th International Workshop on Computer Science and engineering: Information Processing and Control engineering, WCSE 2015-IPCE

作者： Guo, Yue Huang, Zhiqing Lei, Jun School of Software Engineering Beijing University of Technology Beijing 100124 China Beijing Engineering Research Center for IoT Software and Systems Beijing 100124 China

Location-Based Service has moved into indoor scene by mature Wi-Fi network infrastructure and intelligent handheld terminal device development in decade years. Traditional indoor localization systems is designed by RSSI fingerprint mechanism to estimate user location. This paper indicated the limitation of pure RSSI by analysing the RSSI performance in experiment and proposed an RSSI-Pro transformation algorithm for radio map construction. To verify the desired accuracy an actual indoor localization system called LocNeedle is designed to implement the method of this article. LocNeedle adopts Bhattacharyya distance as similarity measurement metric to find the target user location, which can achieve that the 95% of localization error distance is under 2.5 meters while 70% is under 1 meter.

关键词： Probability distributions

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POWER-SYSTEM VOLTAGE CONTROL BY DISTRIBUTED EXPERT systems

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 1990年第3期37卷 236-240页

作者： MATSUDA, S OGI, H NISHIMURA, K OKATAKU, Y TAMURA, S Artificial Intelligence Technology Department Computer and Communication Research Center Tokyo Electric Power Company Limited Japan Systems and Software Engineering Laboratory Toshiba Corporation Japan

A case study of the application of a distributed control scheme to a power system control is presented. In addition, an investigation has been conducted into voltage control. Combined injection of VAr-compensating devices controlled by distributed expert systems has been proposed as a measure to maintain voltage stability in a power system under heavy loading conditions. A simulation study has been carried out by using five workstations that represent a power system and four VAr-compensating devices. The results demonstrate the effectiveness of the proposed system for voltage recovery.< >

关键词： Power system control Power systems Voltage control Expert systems Power system stability Power system simulation Distributed control Power system measurements Control systems Power measurement

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Expressive power of the schematic protection model

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Journal of Computer Security 1992年第1期1卷 59-98页

作者： Sandhu, Ravi S. Center for Secure Information Systems Department of Information and Software Systems Engineering George Mason University Fairfax VA 22030-4444 United States

This paper we show that the Schematic Protection Model (SPM) subsumes several well-known protection models as particular instances. We show this for a diverse collection of models including the Bell-LaPadula multilevel security model, take-grant models, and grammatical protection systems. Remarkably SPM subsumes these models within its known efficiently decidable cases for safety analysis (i.e., the determination or whether or not a given privilege can possibly be acquired by a particular subject). Therefore SPM subsumes these models not only in terms of its expressive power but also in terms of safety analysis. This is in sharp contrast to the Harrison-Ruzzo-Ullman (HRU) access-matrix model. HRU does subsume all the models discussed in this paper in terms of expressive power. However, all known constructions of these models in HRU require multi-conditional commands (i.e., commands whose conditions have two or more terms), whereas safety is undecidable in HRU even for bi-conditional commands (i.e., commands whose conditions have exactly two terms). © 1992 IOS Press and the authors.

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Safe and secure cyber-physical systems

Safe and secure cyber-physical systems

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作者： Biró, Miklós Mashkoor, Atif Sametinger, Johannes Software Competence Center Hagenberg Hagenberg Austria Institute for Software Systems Engineering Johannes Kepler University Linz Linz Austria

Cyber-Physical systems (CPSs) differ from traditional Information Technology (IT) systems in such a way that they interact with the physical environment, i.e., they can monitor and manipulate real objects and processes. For this special issue, the authors of the best papers of IWCFS 2019 were invited to submit extended versions of their workshop papers. Additionally, we received eight submissions from around the globe as a result of an open call. After thorough and stringent reviews, we selected six articles that provide relevant contributions to the field of safety and security for CPSs. © 2021 John Wiley & Sons, Ltd.

关键词： Cyber Physical System

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MQTT Subscription Tree Optimization and Performance Analysis 7

MQTT Subscription Tree Optimization and Performance Analysis

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7th IEEE Advanced Information Technology, Electronic and Automation Control Conference, IAEAC 2024

作者： Li, Aodong Beijing University of Technology Beijing Engineering Research Center for IoT Software and Systems Beijing China

ISBN: (纸本)9798350339161

With the continuous development of the Internet of Things (IoT) technology, the large number of messages generated by the increasing number of IoT devices has brought new challenges to MQTT servers. Due to the need for timely forwarding of MQTT messages, the latency of message reception and forwarding will also increase when there are too many clients connected to the server and message publishing and subscription activities are too frequent. In response to this issue, this paper proposes an MQTT subscription tree optimization method that combines hash tables and trie trees. Then, this method is used to implement the subscription tree module of a simple MQTT server, and its performance is compared and analyzed with several other subscription tree implementation methods. The final experimental results show that when a large number of clients connect to the server and frequently publish messages or subscribe to topics, the method proposed in this paper can reduce message forwarding latency, achieve fast message routing, and improve the efficiency of server message forwarding. © 2024 IEEE.

关键词： Data structures

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Gender Classification From Pashto Handwritten Text Images

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IEEE Access 2025年 13卷 81736-81754页

作者： Sultan, Khan Ahmad, Riaz Muhammad, Siraj Almutairi, Sulaiman Abohashrh, Mohammed Ullah, Khalil Namoun, Abdallah Hussain, Ibrar Shaheed Benazir Bhutto University Department of Computer Science Dir Upper Khyber Pakhtunkhwa Sheringal Pakistan Qassim University College of Applied Medical Sciences Department of Health Informatics Qassim 1452 Saudi Arabia King Khalid University College of Applied Medical Sciences Department of Basic Medical Sciences Abha 61421 Saudi Arabia University of Malakand Department of Software Engineering KP Dir Lower Pakistan Islamic University of Madinah AI Center Faculty of Computer and Information Systems Madinah 42351 Saudi Arabia Shaheed Benazir Bhutto University Quality Enhancement Cell Sheringal Khyber Pakhtunkhwa Dir Upper Pakistan

Computer vision (CV) is a subfield of computer science that enables machines to perceive, interpret, and understand visual data. It combines image processing, analysis, and machine learning to extract meaningful insights from images and videos. One key application of CV is the classification of gender from handwritten text images-a complex task, especially in languages such as Pashto due to the intricacy of the script and the limited resources. This research presents a novel approach to gender classification using Pashto Handwritten Text Images (PHTI). The study evaluates and compares the performance of traditional machine learning and modern deep learning models: Support Vector Machine (SVM) and You Only Look Once version 8 (YOLO8), a CNN-based object detection framework. The PHTI dataset, introduced in this study, consists of 36, 086 text line images written by 200 male and 200 female native Pashto writers. The goal is to assess how effectively SVM and YOLO8 can classify gender based on visual handwriting patterns in the Pashto language. The experimental results reveal that YOLO8 outperforms SVM in classification accuracy. Although SVM, a widely used machine learning model, achieved an accuracy of 61.29%, YOLO8 reached a significantly higher accuracy of 77% in the same data set. This performance gap highlights the advantages of using advanced deep learning models for complex pattern recognition tasks in CV. This research provides a pioneering contribution by focusing on Pashto, a low-resource language, in the context of gender classification using handwritten text images. It opens new pathways for applying CV in regional languages and supports the development of intelligent systems capable of handling various scripts. © 2013 IEEE.

关键词： Classification CNN Computer Vision Gender Pashto SVM YOLO

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Principles for successful systems and software processes

Principles for successful systems and software processes

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2014 International Conference on software and systems Process, ICSSP 2014

作者： Boehm, Barry Center for Systems and Software Engineering University of Southern California Los Angeles CA United States

ISBN: (纸本)9781450327541

This paper summarizes several iterations in developing a compact set of four key principles for successful systems engineering, which are 1) Stakeholder Value-Based Guidance 2) Incremental Commitment and Accountability 3) Concurrent Multidiscipline engineering, and 4) Evidence- and Risk-based Decisions. It provides a rationale for the principles, including short example case studies of failed projects that did not apply the principles, and of successful projects that did. It will compare the principles with other sets of principles such as the Lean systems engineering and the Hitchins set of principles for successful systems and systems engineering, and indicate how the principles will help projects and organizations cope with increasing needs for process diversity and change. © 2014 ACM.

关键词： systems engineering

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Joint data augmentation and attention mechanism for occluded human pose estimation 7

Joint data augmentation and attention mechanism for occluded...

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7th IEEE Advanced Information Technology, Electronic and Automation Control Conference, IAEAC 2024

作者： Pan, Xuelun Li, Da Huang, Zhangqin Yang, Huapeng Beijing University of Technology Beijing Engineering Research Center for IoT Software and Systems Beijing China

ISBN: (纸本)9798350339161

Human pose estimation technology has important applications in many fields. Existing research mainly focuses on precise localization of human key points in unobstructed situations but neglects the common occlusion problem in daily environments. Occlusion can disrupt the correlation between key points in the human body, causing a decrease in model accuracy. In response to the above issues, this article proposes a joint data augmentation and attention mechanism for occluded human pose estimation. This article focuses on training human key points in images, generating a specific number and size of occluded areas to simulate scenarios where human key points are occluded. To further enhance the model's ability to extract feature information, this method considers the global context of feature and integrates the GC Block attention mechanism into the human pose network structure, enabling the network to focus on the human body regions in the image. This method has been experimentally validated on the OCHuman dataset, and the results show that it can effectively improve the accuracy of joint localization in human pose estimation. © 2024 IEEE.

关键词： Image enhancement

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