Gi-Chul Yang

An efficient leader election algorithm for mobile ad hoc networks

Nodes communicate under peer-to-peer level in ad-hoc mobile networks To manage the inter-node communication and data exchange among them a leader node is required In this paper we present a leader election algorithm for distributed mobile ad hoc networks where inter-node communication is allowed only among the neighboring nodes along with the correctness of the algorithm The algorithm uses least amount of wireless resources and does not affect the movement of the nodes.

CSMA/CA protocol based energy efficient transmission scheme for wireless pans

In this paper, we propose a QoS guaranteed and energy-efficient transmission scheme for Wireless Personal Area Networks (WPANs), which operate in conjunction with contention-based access protocols, such as CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance). Energy consumption is one of the most important issues in WPAN systems, because WPAN devices are often required to operate under limited battery capacity. Furthermore, if the WPAN adopts a contention-based medium access protocol, the energy consumption problem becomes even more critical due to the collisions caused by independent channel access trials. Therefore, in this paper, we propose an algorithm that selects the optimum fragment size, modulation level, and transmission power, in order to minimize the energy consumption and guarantee the QoS (Quality of Service) requirements, simultaneously. Our simulation results show that the proposed algorithm has better performance than the previous ones.

Development of a Customer Management Application and a Mobile Advertisement Model based on PUSH Technology

Abstract PUSH technology is a technology that can transfer server information without users request and it is very useful in various areas along with mobile applications. This paper suggest a suitable application model that can utilizes the PUSH technology and mobile devices by finding a useful area. For this, AdMan, a mobile application which can utilize the PUSH technology and mobile devices has been developed. AdMan is a mobile application that developed once and can be able to run on both Android and iOS based mobile devices, since it was developed by using a tool called m-Bizmaker. AdMan is a customer management and advertisement system that can bring big efficiency by utilizing the PUSH technology and mobile application under the todays mobile environment, and it is a good model of ICT technology application of modern society. As an application that can maximize the utilization of the PUSH technology and mobile devices, AdMan can realize better effectiveness if it run on a PUSH server.

A Survey on Functions and Characteristics of Conceptual Graph Tools

Abstract Intelligent systems are systems that mainly use knowledge rather than data or information. Therefore, knowledge representation is an important factor for intelligent system construction. Conceptual graph is a logical knowledge representation language which has graphical form and it can represent knowledge efficiently. It is, however, cumbersome to use conceptual graphs directly for programming. Various tools were developed to overcome this difficulties. In this paper, we survey on functions and characteristics of conceptual graph tools that can be utilized for constructing intelligent systems by using conceptual graphs. The result of this survey will be very helpful to use conceptual graphs for development of intelligent systems. Keywords : Conceptual Graph, Intelligent System, Knowledge Representation, Conceptual Graph Tool Received 12 September 2014, Revised 25 October 2014Accepted 20 December 2014Corresponding Author: Gi-Chul Yang(Mokpo National University) Email: gcyang@mokpo.ac.krⒸ The Society of Digital Policy & Management. All rights reserved. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is ISSN: 1738-1916 properly cited.

Contention-free access protocol based energy-efficient transmission for wireless pans

Energy-efficient transmission technique is a very essential performance decision factor for maximizing the lifetime of energy-constrained wireless devices such as Wireless Personal Area Network (WPAN) devices. Moreover, if the WPAN is operated in conjunction with a TDMA based scheme, the assurance of QoS requirements in the actual physical transmission at each allocated time slot is another important factor to be satisfied. We therefore propose an energy-efficient and QoS aware transmission scheme for WPANs operating in conjunction with a TDMA-based contention-free medium access protocol. The proposed algorithm determines the optimum combination of transmit power, physical data rate (i.e. modulation level) and fragment size required to simultaneously minimize the energy consumption and satisfy the required QoS in each assigned time duration. The proposed algorithm demonstrated the improved performance results in terms of throughput and energy consumption via computer simulations.

DAYS mobile: a location based data broadcast service for mobile users

Location dependent wireless data dissemination has become an integral part of our day-to-day activities. Most available applications are actually location aware which find restaurants, hotels, and millions of other points of interests (POI). Recent advances in global positioning systems (GPS) technology has led to the development of smart and efficient navigation systems with voice prompted turn by turn directions to the destination. Deployment of wireless broadband services like Evolution Data Optimized (EVDO) has motivated the development of ubiquitous data distribution systems or wireless broadcast of Location based Services (LBS). DAYS (Data in Your Space) Mobile discusses a broadcast based LBS which tends to decrease access latency [4] for location dependent data (LDD) when the number of mobile users is significantly large. We create a broadcast platform to disseminate commonly used LDD like weather, traffic, stocks, flight information, etc., and develop and deploy a java based mobile application in a mobile device which accesses the broadcasted LDD. Our experiments and results show that a broadcast based LBS can be highly efficient as compared to the present generation of request-response type LBS.

DHL: semantically rich dynamic and active hyperlinks

A novel hyperlink that can access more than one Web site dynamically by using semantic information attached on the link and each Web site is introduced in this paper The (semantic) descriptions of Web sites are represented by conceptual graphs and stored in a database When a link is clicked, the matching between the link and the sites is performed by a dynamic hyperlink processor, which in turn performs a query to the database through a technique of conceptual graph matching It is definitely better than full-text search and easier to implement.

Automatic hypertext link generation based on conceptual graphs

An efficient way of automatic link generation for a high quality hypertext is described in this article. The syntactic information is not enough to select the correct destination node for a button in a hypertext. The information besides syntactic information such as semantic information and even background knowledge are indispensable. In order to utilize the information, a partner concept table is used along with the ideas of canonical graph and conformity relation in conceptual graph theory. A conceptual graph representation form called U-Form is presented here for efficient processing of conceptual graphs in a machine.