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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Korean Institute of Industrial Engineers
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Volume & Issues
Volume 9, Issue 3 - Nov 1996
Volume 9, Issue 2 - Jul 1996
Volume 9, Issue 1 - Mar 1996
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Techno-Economic Study in Telecommunications
Lee, Kwang-Hee ; Seo, Seung-Woo ; Park, Gwang-Man ;
IE interfaces, volume 9, issue 3, 1996, Pages 1~9
Competition in telecommunications field brings about change in attitudes toward technology development. It is no longer the case that technology development itself has merits but that technology development should be considered in terms of its economic concepts such as the cost-effectiveness concept. Techno-Economic study intend to incorporate the idea of economic efficiency into technology development and management so that economic potential of technologies is maximized. This paper categorizes the contents of techno-economic study in telecommunications and information technologies and suggests a framework of techno-economic study based on technology lifecycle and decision makers.
A Competitiveness Analysis of Information And Telecommunications Equipments Industry in South Korea
Cho, Kyung-Hwan ; Oh, Gil-Hwan ;
IE interfaces, volume 9, issue 3, 1996, Pages 10~21
Does the competitiveness of ow Information and Telecommunications Equipments Industry have \problems in viewpoint of export and import? If it has problems, what are those? Can we identify in detail where the problem will be? In this paper we deals with the above issues and suggest an analysis tool to narrow the scope of the place where the problem is to be emerged. Some characteristics of this analysis tool are figured out.
Network Configurations and Characteristics of the KOREASAT Satellites' Services
Chung, Sang-Wook ; Yang, Sang-Jin ;
IE interfaces, volume 9, issue 3, 1996, Pages 22~33
The KOREASAT satellite, the first Korean commercial communication and broadcasting satellite, has been launched in August 1995, and has started to provide the communication and preliminary broadcasting services, respectively, in March and July 1996. In this paper the network configurations and characteristics of the services which the KOREASAT satellite provides are described. The services, which are provided by the KOREASAT satellite with its twelve communication and four broadcasting transponders, are the direct broadcasting service, the video relay service including the TVRO, SNG and TV/CATV program distribution, the company-wide communication service including VSAT and TSAT, and the other services with the digital line, trunk relay, telephone line, mobile data, music broadcasting services, etc. A communication transponder has the 36MHz bandwidth and 14W output power, and a broadcasting transponder has the 27MHz bandwidth and 12OW output power.
Standardizational Steps and Direction for Desirable Domestic PCS
Park, Dong-Joon ; Kim, Shin-Bae ; Ha, Deock-Ho ;
IE interfaces, volume 9, issue 3, 1996, Pages 34~43
Effect of Price on the PCS Demand
Chang, Suk-Gwon ;
IE interfaces, volume 9, issue 3, 1996, Pages 44~51
The purpose of this paper is to develop a modeling framework for analyzing the effect of price on the PCS (Personal Commununications Service) demand. To achieve this aim, a nonlinear regression model was derived to capture the income effect on the PCS demand and then was combined into an integrated Bass diffusion model. The model was then applied to the emerging PCS market in Korea and the market demands up to the year 2006 were estimated. The results were reviewed and evaluated in various aspects. Finally, the possibilities of model enhancement and model extensions were explored.
Design of Self-Healing Algorithm for Double Link Failure in SONET
Han, Kyoung-Heum ; Koh, Jai-Sang ; Cho, Choong-Ho ;
IE interfaces, volume 9, issue 3, 1996, Pages 52~63
Balancing Inter-Ring Loads on SONET Dual-Ring without Demand Splitting
Lee, Chae-Y. ; Moon, Jung-H. ;
IE interfaces, volume 9, issue 3, 1996, Pages 64~71
In the survivability and simplicity aspect, SONET Self-healing Ring(SHR) is one of the most important schemes for the high-speed telecommunication networks. Since the ring capacity requirement is defined by the largest STS-1 cross-section in the ring, load balancing is the key issue in the design of SONET SHR. Recently, most of the research on load balancing problem have been concentrated on the SONET single-ring case. However, in certain applications, multiple-ring configuration is necessary because of the geographical limitations or the need for extra bandwidth. In this paper, the load balancing problem for SONET dual-ring is considered by assuming symmetric inter-ring demands. We present a linear programming based formulation of the problem. Initial solution and improvement procedures are presented, which solves the routing and interconnection between the two rings for each demand. Computational experiments are performed on various size of networks with randomly generated demand sets. Results show that the proposed algorithm is excellent in both the solution quality and the computational time requirement. The average error bound of the solutions obtained is 0.26% of the optimum.
On the Survivable Network Design Problem
Myung, Young-Soo ; Kim, Hyun-Joon ;
IE interfaces, volume 9, issue 3, 1996, Pages 72~80
As the fiber optic technology is rapidly being deployed in telecommunication networks, particular emphasis is placed on the survivability in designing networks. Most of the survivable network design models proposed to date have connectivity constraints, which cannot precisely define a network topology owing to the multiplicity of feasible ones. In this paper, we propose a k-link survivable network design model incorporating traffic-based survivability constraints which restrict the lost traffic due to a network failure under a prescribed level. Our model is shown to include the existing connectivity models as special cases. Then we present its integer programming formulation, analyze the structural properties, and develop a heuristic for obtaining low cost survivable networks.
A Study on Telecommunication Network Survivability by Integrating the Logical Layer and the Transmission System Layer
Lee, Hee-Sang ;
IE interfaces, volume 9, issue 3, 1996, Pages 81~91
Algorithm Implementation Issues and use of Conduits in Design of Optic Fiber Based Survivable Network
Cho, Sung-Zoon ; Han, Chi-Geun ;
IE interfaces, volume 9, issue 3, 1996, Pages 92~100
The current copper-based communication network is going to be replaced with an optic fiber network. The new technology allows a larger amount of information to be transmitted than before. Due to its bandwidth and relatively high installation cost, however, the optic fiber network does not exhibit the inherent structural redundancy provided by the conventional copper-based network. We propose to supply it by adding multiple paths between important nodes. This so-called network survivability problem is computationally expensive to solve exactly. We report the application of a heuristic algorithm to this problem. Also discussed is the issue of how to make use of existing conduits.
A Review on the Planning of Subscriber Access Networks
Kim, Ji-Pyo ;
IE interfaces, volume 9, issue 3, 1996, Pages 101~109
Performance Requirements for Intelligent Peripheral in Advanced Intelligent Network
Baek, Jang-Hyun ; Sone, Chang-Soo ;
IE interfaces, volume 9, issue 3, 1996, Pages 110~119
A Survey of Queueing Approaches in ATM
Park, No-Ik ; Lee, Ho-Woo ;
IE interfaces, volume 9, issue 3, 1996, Pages 120~142
Asynchronous Transfer Mode (ATM) is considered to be the most promising transfer technique for BISDN due to its efficiency and flexibility. Queueing theory has been playing a very important role in performance evaluation of ATM for the past few years. This paper is composed of two parts. The first part is concerned with the several basic concepts of ATM. The second part surveys queueing approaches in ATM performance evaluation. It deals with stochastic models which have been proposed for the three basic categories of traffic sources (voice, data, video), various queueing models for statistical multiplexer and switch, and priority strategies for buffer control schemes.
Survey and Classification of Performance Evaluation Techniques for ATM Multiplexer
Choi, Woo-Yong ; Kim, Ji-Soo ; Jun, Chi-Hyuck ;
IE interfaces, volume 9, issue 3, 1996, Pages 143~156
Development of a simulator for the performance evaluation of various types of communication networks
Yoon, Bok-Sik ;
IE interfaces, volume 9, issue 3, 1996, Pages 157~167
Due to the drastic technological innovation and introduction of various kinds, of new communication services, the structure and operation of communication networks are becoming complicated and diversified more and more. Accordingly, the necessity of flexible simulation tools which can be utilized for various performance evaluation jobs in various types of communication networks is growing. In this article, various existing simulation tools are briefly surveyed and the requirements for the simulator dedicated for the performance evaluation of communication networks are discussed. Then, a strategy to develop a simulator dedicated for the performance evaluation of communication networks is proposed. Our approach is based on the prototyping strategy, in which a relatively simple prototype structure is developed first and more functions are added whenever necessary. By following this strategy, a simulator can be developed and evolved in a timely manner at a relatively small cost.
On the Comparison of Call Overload Control Methodologies in ATM Networks
Song, Ki-Sang ; Lee, Jean ;
IE interfaces, volume 9, issue 3, 1996, Pages 168~179
Automatic repeated recalling from individual computing equipments such as PC and workstations, to access ATM networks may result in call overload to networks. Call overload causes to waste network resources and fail to meet user call processing QoS requirements. We evaluate two call connection request methods: the back-off recall method(BRM) which makes recall with random waiting time after rejection, and the direct recall method(DRM) which repeats call connection request whenever call request is rejected. We evaluate their performances by simulation and it shows that as the total number of attached terminals to each access node increases, BRM performs better than DRM in terms of the call acceptance level and effective network bandwidth utilization.
Analysis of Delay Time in the Personal Communications Exchange
Jang, Hee-Seon ; Suh, Jae-Jun ; Lim, Seog-Ku ; Yu, Jea-Hoon ; Lee, Yoon-Ju ;
IE interfaces, volume 9, issue 3, 1996, Pages 180~193
Forecasting Modeling for the Number of Mobile Telecommunication Service Cancelers: Application to Cellular Phone Service
Jun, Duk-Bin ; Lim, Churl-Zu ; Joo, Young-Jin ; Park, Yoon-Seo ; Park, Myoung-Hwan ; Park, Young-Seon ;
IE interfaces, volume 9, issue 3, 1996, Pages 194~201
Storage Allocation in Multi-level VOD Network Using Dynamic Programming
Kim, Yeo-Keun ; Cho, Myoung-Rai ; Kim, Jae-Yun ;
IE interfaces, volume 9, issue 3, 1996, Pages 202~213
Video-on-demand is an interactive service that provides programs (movie, home shopping, etc.) to users connected to a network. This service will require high bandwidth network and video servers with a large amount of storage capacity. From the viewpoint of system analysis, there are optimization problems to be solved. In this paper, we present a dynamic programming method for allocating the storage for programs being served in a multi-level video-on-demand network. In the optimization of the network resource, we consider the three kinds of costs: installation cost for video servers, program storage cost, and transmission (or communication) cost. The factors related to the costs are investigated. An example is shown to illustrate the proposed method.
Development of a Prototype for Agile Manufacturing System on Information Superhighway
Lee, Soung-Ryong ; Cho, Hyun-Bo ; Jung, Moo-Young ; Wang, Gi-Nam ;
IE interfaces, volume 9, issue 3, 1996, Pages 214~224
Data Communications and their Applications in the Automated TFT LCD Manufacturing System
Jo, Min-Ho ;
IE interfaces, volume 9, issue 3, 1996, Pages 225~235
The SECS Ⅰ and Ⅱ Protocol has been widely used for the TFT LCD and semiconductor industry. This paper shows how the SECS protocol is implemented for data communications between the Host (CAM) and the TFT LCD equipments. In addition, this study introduces a way to apply the SECS protocol to the manufacturing systems control. It provides better throughput in terms of production and faster control of the automated TFT LCD manufacturing system by way of shortcut and distribution of control and data communications. The SECS protocol is successfully used for the control of the real TFT LCD manufacturing system.
Extended Trigger Modelling for the Workflow Analysis and Design: Case of Telecommunication Company
Han, Dong-Il ; Park, Sei-Kwon ;
IE interfaces, volume 9, issue 3, 1996, Pages 236~248
Most of business enterprises today struggle with the coordination of work which is one of the most challenging problems in the business environment. And the situation becomes worse by the increasing complexity and uncertainty. In this paper, suitability of workflow technology for the modelling, optimization, and automation in the complex business structures is discussed. Also, in the abscence of a fully fledged method for analysis and design of workflow systems, this paper proposes a method, ETM(Extended Trigger Modelling), which can solve several problems in other methods. The proposed ETM approach consists of three stages such as situation analysis stage, activity coordination stage and implementation preparation stage. A modelling case of the proposed procedure is also presented.
Systems Analysis of the Internet E-Mail Security Using IDEFO Modeling
Kim, Joong-In ; Kim, Seok-Woo ;
IE interfaces, volume 9, issue 3, 1996, Pages 249~256
The Internet e-mail security software and standards, such as PGP (Pretty Good Privacy) and PEM (Privacy Enhanced Mail), have several limitations that should be overcome for their further applications to the Internet and network environments. In order to improve and reengineer those software, details of the As-Is software processing should be analyzed. One of the possible techniques for software analysis is IDEFO function modeling. Although IDEFO has been mainly used for BPR as one of the industrial engineering techniques, it has been rarely applied to the analysis of software processing and reengineering in computer and software engineering fields. Additionally, no sufficient details of PGP and PEM processing are analyzed in the literature. The objective of this paper is to demonstrate the application of the IDEFO to the systems analysis of the Internet e-mail security software as well as to provide software developers with the basis for software improvements.
The Development of Database Interfaced Expert System for Controlling Occupational Workload
Jeong, Hwa-Shik ; Choi, Jin-Seob ;
IE interfaces, volume 9, issue 3, 1996, Pages 257~268
This paper illustrates the process of developing and configuring the prototype Computer Analysis System for Controlling Occupational WORKload (CAS-COWORK). The software interface between the database and expert system was attempted. The database is used for storing and retrieving series of data entered by general users and the expert system is used for identifying and solving occupational problem areas. Two theories were applied in developing the algorithm base of CAS-COWORK that were used to calculate overall workload stress level. The fuzzy set theory was introduced to capture the subject‘s workload stress perception. The Analytic Hierarchy Process (AHP) was introduced to estimate the importance of the task and workplace variables. The purpose of the system development is for future prediction and problem solving which would be highly valuable to the industrial engineer.
The Application of GDSS at Group Decision Stages for Various Task Types
Son, Dal-Ho ;
IE interfaces, volume 9, issue 3, 1996, Pages 269~282
This paper introduced a procedure for improving the quality of group decision making in various task types. Emphasis is placed on the construction of the optimal GDSS(Group Decision Support System) design with identifying the group decision characteristics of decision stages on the various task types. Especially, the identification of outliers and the establishment of confidence limits in group decision making were stressed. Participants in group decision making whose 'opinions fall outside the group's tolerance level are further studied to annex the source of this variation. The result showed that a preparation stage in the generating idea-type task and a illumination stage in the negotiating-type task were critical. Furthermore, the degree of the disagreement was severe in the verification and the preparation stages on group decision making. This paper developed a general procedure for improving the quality of group decision making. The procedure presented helps in identifying those stakeholders whose opinions may significantly deviate from that of the group.
Automatic Nesting and NC Cutting of Flat-Bar
Lee, Cheol-Soo ; Park, Gwang-R. ;
IE interfaces, volume 9, issue 3, 1996, Pages 283~297
The 'flat-bar' is a stiffener which is a component of ships. It is basically a long rectangle and has 'end-cut' shapes at both sides. The paper describes a fast nesting algorithm of the flat-bar, and a procedure to generate cutting path of gas/plasma torch, which is operated by a NC (numerically controlled) gas/plasma cutting machine. Proposed procedures are written in C-language and executable on VAX machine with Open VMS operating system.
Rolling Force Prediction in Cold rolling Mill using Neural Networks
Cho, Yong-Jung ; Cho, Sung-Zoon ;
IE interfaces, volume 9, issue 3, 1996, Pages 298~305
Cold rolling mill process in steel works uses stands of rolls to flatten a strip to a desired thickness. Most of rolling processes use mathematical models to predict rolling force which is very important to decide the resultant thickness of a coil. In general, these mathematical models are not flexible for variant coil types and cannot handle various elements which is practically important to decide accurate rolling force. A corrective neural network is proposed to improve the accuracy of rolling force prediction. Additional variables-composition of the coil, coiling temperature and working roll parameters-are fed to the network. The model uses an MLP with BP to predict a corrective coefficient. The test results using 1,586 process data collected at POSCO in early 1995 show that the proposed model reduced the prediction error by 30% on average.
Advanced Manufacturing Technologies on the World Wide Web: Methodologies and Application Techniques
Kim, Seong-Jip ; Kim, Nak-Hyun ; Yang, Tae-Kon ;
IE interfaces, volume 9, issue 3, 1996, Pages 306~316
The easily use of WWW and Web browser of INTERNET makes the world our stage. But when we search for the information and resource that we want, the information supplied by search engine (e.g., Yahoo, Lycos, WebCrawler, Alta Vista) is inadequate to acquire the necessary and related information of research issues. This paper surveys AMT(Advanced Manufacturing Technology) which is the research topics recently on the WWW(WorLd Wide Web) and provides searching methods and information for academic research, technical report, proceedings, software, etc. It also briefly surveys WWW-VL(Virtual Library) and reviews the major three technology, CALS (Commerce At Light Speed), AMS(Agile Manufacturing System), CE(Concurrent Engineering), that is recently the focus of the research issue of Industrial Engineer.