Search results for: C.-K. Toh

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chapter

A Mobile Agent-Based P2P Autonomous Security Hole Discovery System

Ji Zheng, Xin Wang, Xiangyang Xue, C. K. Toh

Lecture Notes in Computer Science > Advances in Natural Computation > Swarm Intelligence and Intelligent Agents > 525-534

A general or agent-based security system is usually constructed hierarchically and has a central manager acting as head of the whole system. However, the manager becomes a bottleneck for being connected by each client. It can even overload when too many clients request service simultaneously. The whole system may collapse when the central manager is attacked. And these systems are passive to detect...

chapter

An Efficient Address Assignment Mechanism for Mobile Ad-Hoc Networks

Uhjin Joung, Dongkyun Kim, Nakjung Choi, C. K. Toh

Lecture Notes in Computer Science > Information Networking. Towards Ubiquitous Networking and Services > Part I > 202-212

In a mobile ad-hoc network (MANET), in order to route a packet between any nodes, nodes should have their unique IP address in the network. In our previous work, we introduced and compared three IP assignment mechanisms, namely RADA, LiA, and LiACR. In RADA, a randomly-selected IP address in a specified address space is assigned to a joining node, which results in poor utilization of the address space...

chapter

Loop-Based Topology Maintenance in Wireless Sensor Networks

Yanping Li, Xin Wang, Florian Baueregger, Xiangyang Xue, more

Lecture Notes in Computer Science > Networking and Mobile Computing > Session 23: Sensor Networks II > 1154-1162

Clustering is recognized as an effective topology maintenance framework to provide better scalability for Wireless Sensor Networks. When loop structures are deployed to topology maintenance, it can provide better robustness and convenient route recovery, for the topology information is disseminated within a loop instead of a single node and the nature of the loop that there are two paths between each...

chapter

A Power Control MAC Protocol Based on Fragmentation for 802.11 Multi-hop Networks

Dongkyun Kim, Eunsook Shim, C. K. Toh

Lecture Notes in Computer Science > Information Networking. Advances in Data Communications and Wireless Networks > Ad Hoc Sensor Networks > 227-236

In order to reduce energy consumption at the 802.11 based MAC layer for MANETs (Mobile Ad Hoc Networks), there exists an approach to use the maximum power during RTS-CTS exchange and compute the required amount of power in order for DATA and ACK messages to reach the receiver and sender. However, it does not consider the existence of an interference range, which results in a collision at sender. Although...

article

Special issue on telematics communications and vehicular networking

Pietro Manzoni, Richard D. Gitlin, C. K. Toh, Tao Zhang, more

Journal of Communications and Networks > 2013 > 15 > 2 > 115 - 121

This special issue on Telematics Communication and Vehicular Networks examines the critical issues involved with telematics such as vehicular network infrastructure, vehicular network communication protocols, and vehicular services and applications.

article

RCDP: Raptor-based content delivery protocol for unicast communication in wireless networks for ITS

Miguel Baguena, C. K. Toh, Carlos T. Calafate, Juan-Carlos Cano, more

Journal of Communications and Networks > 2013 > 15 > 2 > 198 - 206

Recent advances in forward error correction (FEC) coding techniques were focused on addressing the challenges of multicast and broadcast delivery. However, FEC approaches can also be used for unicast content delivery in order to solve transmission control protocol issues found in wireless networks. In thispaper, we exploit the error resilient properties of Raptor codes by proposing Raptor-based content...

article

Computer Simulations of VANETs Using Realistic City Topologies

Francisco J. Martinez, Manuel Fogue, C. K. Toh, Juan-Carlos Cano, more

Wireless Personal Communications > 2013 > 69 > 2 > 639-663

Researchers in vehicular ad hoc networks (VANETs) commonly use simulation to test new algorithms and techniques. This is the case because of the high cost and labor involved in deploying and testing vehicles in real outdoor scenarios. However, when determining the factors that should be taken into account in these simulations, some factors such as realistic road topologies and presence of obstacles...

chapter

Three dimensional adjustable cavity for flexible singulation of multiple medications in an automated medication dispenser

C. K. Toh, S. L. J. Ng, Y. O. Tan

2012 IEEE International Conference on Automation Science and Engineering (CASE) > 347 - 352

2012 IEEE International Conference on Automation Science and Engineering (CASE 2012)

In the development of an effective medication management system to improve medication adherence, the challenge of flexibly dispensing of medications of multiple sizes and shapes was encountered. It is found that most of the medication dispensers in the market, as well as the feeding and orienting mechanisms in manufacturing sector, are customized to be operated with objects of specific size. In view...

article

Foreword by Guest Editor for the Special Issue on the 2010 ICUFN Conference

C. K. Toh

Wireless Personal Communications > 2011 > 60 > 1 > 1-2

chapter

The controversy of Selfish nodes in ad hoc networks

C K Toh, Dongkyun Kim, Sutaek Oh, Hongseok Yoo

2010 The 12th International Conference on Advanced Communication Technology (ICACT) > 2 > 1087 - 1092

2010 12th International Conference on Advanced Communication Technology (ICACT 2010)

Currently, there are work related to selfish nodes in ad hoc mobile networks. In this paper, questions on the viability, validity, and presence of selfish nodes are raised and discussed. Various definitions and interpretations of the term ??selfishness?? are also presented, along with ways of determining and evaluating selfishness. In this paper, we introduce SCNP - Selfish Check Negotiation Protocol...

chapter

Modeling of mobility and groups in inter-vehicular MANET-based networks

Juan-carlos Cano, Carlos Calafate, Pietro Manzoni, C.-k. Toh

2007 2nd International Symposium on Wireless Pervasive Computing

article

Improving TCP-Vegas Performance Over MANET Routing Protocols

Dongkyun Kim, Hanseok Bae, C. K. Toh

IEEE Transactions on Vehicular Technology > 2007 > 56 > 1 > 372 - 377

Recently, the Internet Engineering Task Force Mobile Ad Hoc Network (MANET) working group has standardized the reactive and proactive MANET routing protocols. In addition, work on using the transmission control protocol (TCP) to provide reliable data transmission has been performed for the purpose of smooth integration with the wired Internet. In the wired Internet, TCP-Vegas is a well-known transport...

article

Guest Editorial Special Section on On-the-Road Mobile Networks

C. K. Toh

IEEE Transactions on Intelligent Transportation Systems > 2007 > 8 > 3 > 378

The three articles in this special section are devoted to on-the-road mobile network communication services, including: design and evaluation techniques; push-to-talk services; and local density estimation and transmission-range assignment.

article

A Low-Complexity Routing Algorithm with Power Control for Self-Organizing Short-Range Wireless Networks

Juan-Carlos Cano, Pietro Manzoni, Dongkyun Kim, C-K Toh

Wireless Personal Communications > 2007 > 41 > 3 > 407-425

Mobile computing has become very pervasive, where the number of electronic devices equipped with wireless capabilities has increased significantly in recent years. This poses serious demands on wireless, mobile and self-organizing networks. Despite the fact that devices are getting smaller and more powerful, advances in battery technology have not yet reached the stage where devices can autonomously...

article

The use of ultrasonic cavitation peening to improve micro-burr-free surfaces

C. K. Toh

The International Journal of Advanced Manufacturing Technology > 2007 > 31 > 7-8 > 688-693

Advances in machining technology, particularly in the field of micro-machining, have led to the design and creation of miniature components suitable for use in the precision engineering industry. However, the need to contain ubiquitous burrs still exists and has to be addressed. Previous studies on deburring have mostly focused on the parametric investigations of orientation, temperature, type of...

chapter

A comparison of the performance of TCP-Reno and TCP-Vegas over MANETs

Dongkyun Kim, J.-C. Cano, P. Manzoni, C.-K. Toh

2006 3rd International Symposium on Wireless Communication Systems > 495 - 499

3rd International Symposium on Wireless Communication Systems

IETF MANET (mobile ad hoc network) working group has standardized AODV (ad hoc on-demand distance vector) and OLSR (optimized link state routing) as its reactive and proactive routing protocols, respectively. In addition, from the transport layer's perspective, TCP (transmission control protocol) is still needed for MANET since it is widely used in the current Internet and suitable for smooth integration...

article

A loop-based approach in clustering and routing in Mobile Ad hoc NETworks

Yanping Li, Xin Wang, Xiangyang Xue, C. K. Toh

Journal of Electronics (China) > 2006 > 23 > 5 > 650-655

Although clustering is a convenient framework to enable traffic control and service support in Mobile Ad hoc NETworks (MANETs), it is seldom adopted in practice due to the additional traffic overhead it leads to for the resource limited ad hoc network. In order to address this problem, we proposed a loop-based approach to combine clustering and routing. By employing loop topologies, topology information...

article

UbiqMuseum: A Bluetooth and Java Based Context-Aware System for Ubiquitous Computing

Juan-Carlos Cano, Pietro Manzoni, C.-K. Toh

Wireless Personal Communications > 2006 > 38 > 2 > 187-202

This paper evaluates the use of Bluetooth and Java based technologies in ubiquitous computing environments. Ubiquitous computing strongly depends on leveraging appropriate contextual information to users, according to their preferences and the environment in which they reside. We present UbiqMuseum – an experimental context-aware application that provides context-aware information to museum visitors...

article

Mobile multicasting in wireless ATM networks

D.‐K. Kim, C.‐K. Toh

Mobile Networks and Applications > 2004 > 5 > 2 > 103-110

Multicasting is a desired function in both wired and wireless networks. Currently, multicasting‐based applications have pervasive presence and influence in our Internet. Wireless ATM aims to support different traffic types over a high speed wireless network. In particular, traditional approaches towards multicasting in wired networks cannot be directly applied to mobile ATM networks. This includes...

article

Surface integrity effects on turned 6061 and 6061-T6 aluminum alloys

C. K. Toh, S. Kanno

Journal of Materials Science > 2004 > 39 > 10 > 3497-3500

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Search results for: C.-K. Toh

A Mobile Agent-Based P2P Autonomous Security Hole Discovery System

An Efficient Address Assignment Mechanism for Mobile Ad-Hoc Networks

Loop-Based Topology Maintenance in Wireless Sensor Networks

A Power Control MAC Protocol Based on Fragmentation for 802.11 Multi-hop Networks

Special issue on telematics communications and vehicular networking

RCDP: Raptor-based content delivery protocol for unicast communication in wireless networks for ITS

Computer Simulations of VANETs Using Realistic City Topologies

Three dimensional adjustable cavity for flexible singulation of multiple medications in an automated medication dispenser

Foreword by Guest Editor for the Special Issue on the 2010 ICUFN Conference

The controversy of Selfish nodes in ad hoc networks

Modeling of mobility and groups in inter-vehicular MANET-based networks

Improving TCP-Vegas Performance Over MANET Routing Protocols

Guest Editorial Special Section on On-the-Road Mobile Networks

A Low-Complexity Routing Algorithm with Power Control for Self-Organizing Short-Range Wireless Networks

The use of ultrasonic cavitation peening to improve micro-burr-free surfaces

A comparison of the performance of TCP-Reno and TCP-Vegas over MANETs

A loop-based approach in clustering and routing in Mobile Ad hoc NETworks

UbiqMuseum: A Bluetooth and Java Based Context-Aware System for Ubiquitous Computing

Mobile multicasting in wireless ATM networks

Surface integrity effects on turned 6061 and 6061-T6 aluminum alloys

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