Korea Advanced Institute Of Science And Technology Research Articles

Developing scheduling systems for Daewoo Shipbuilding: DAS project

Daewoo Shipbuilding Company, one of the largest shipbuilders in the world, had difficulties with planning and scheduling its production process. To solve the problems, Korea Advanced Institute of Science and Technology (KAIST) and Daewoo have been jointly performing the DAS (DAewoo Shipbuilding Scheduling) Project for three years, from 1991 to 1993. To develop the integrated scheduling systems, several technological breakthroughs were necessary such as hierarchical architecture between systems, constraint directed graph search, spatial scheduling, dynamic assembly line scheduling, and neural network based man-hours estimation. Besides these technological research issues, we adopted the phased development strategy, which consists of three phases of vision revelation, data dependent realization, and prospective enhancement. The DAS systems were successfully launched in January 1994 and are being actively used as indispensable systems in the shipyard resulting in a significant improvement in productivity and reengineering of the scheduling process.

CAIR-2 Intelligent Mobile Robot for Guidance and Delivery

CAIR-2 from the Korea Advanced Institute of Science and Technology (KAIST) placed first in the Office Delivery event at the 1995 Robot Competition and Exhibition, held in conjunction with the Fourteenth International Joint Conference on Artificial Intelligence (IJCAI-95). CAIR-2 is a totally self-contained and autonomous mobile robot, and its control architecture incorporates both behavior-based and planner-based approaches. In this article, we present a short description of CAIR-2's hardware, system and control architecture, realtime vision, and speech recognizer.

DAS: Intelligent Scheduling Systems for Shipbuilding

Daewoo Shipbuilding Company, one of the largest shipbuilders in the world, has experienced great deal of trouble with the planning and scheduling of its production process. To solve the problems, from 1991 to 1993, Korea Advanced Institute of Science and Technology (KAIST) and Daewoo jointly conducted the Daewoo Shipbuilding Scheduling (das) Project. To integrate the scheduling expert systems for shipbuilding, we used a hierarchical scheduling architecture. To automate the dynamic spatial layout of objects in various areas of the shipyard, we developed spatial scheduling expert systems. For reliable estimation of person-hour requirements, we implemented the neural network-based person-hour estimator. In addition, we developed the paneled-block assembly shop scheduler and the long-range production planner. For this large-scale project, we devised a phased development strategy consisting of three phases: (1) vision revelation, (2) data-dependent realization, and (3) prospective enhancement. The DAS systems were successfully launched in January 1994 and are actively being used as indispensable systems in the shipyard, resulting in significant improvement in productivity and visible and positive effects in many areas.

A fuzzy decision problem based on the generalized Neyman-Pearson criterion

Korea Science and Engineering Foundation (KOSEF) under Grant 893-0801-011-2 and Korea Advanced Institute of Science and Technology (KAIST) under an Internal Grant

R & D at the Laboratory for Control Systems and Automation of the Korea Advanced Institute of Science and Technology

SUMMARYThis paper describes the research activities at the Laboratory for Control Systems and Automation (LCA) which is a section of the Production Department of Korea Advanced Institute of Science and Technology (KAIST). LCA's research activities are focused on providing fundamental technologies to cope with the current trends in manufacturing automation. The R & D activities at the laboratory cover diverse areas. The research activities at the laboratory are classified into three sections—robotics and automation, fluid servo control, and manufacturing process control. Detailed explanations are given here on robotics and its application to automation. As a laboratory belonging to a nation's leading educational institution, LCA also conducts active educational activities. Such educational programs are also introduced in detail.

Determinants of Organisational Structure of Small Business Enterprises: Evidence in a Rapidly Developing Country

HYONG YI is a doctoral candidate in management science at the Korea Advanced Institute of Science and Technology (KAIST), Seoul, Korea, and Linsu Kim is Professor of Management, College of Business Administration, Korea University, Seoul. This paper examines both contextual and managers' personal variables in identifying the determinants of structure in small business organisations in a rapidly developing country - Korea. The results support hypotheses derived deductively from literature in advanced countries that a manager's personal variables are stronger predictors of centralisation and formalisation than contextual variables and that contextual variables are stronger predictors of specialisation that a manager's personal variables. The paper discusses the implications of the findings and concludes that the determinants of structure appear to be significantly different between small and large organisations and that hypotheses deductively derived from literature in advanced countries are supported in a rapidly developing country.

Small and Medium-Sized Japanese Joint Venturtes in Korea

Professor Jinjoo Lee is professor of management science at the Korea Advanced Institute of Science and Technology (KAIST); Young-suk Hyun is currently an assistant professor of business administration at the HanNam University, Taejon, few studies have undertaken analyses of the characteristics of Japanese foreign direct investment in developing countries. The purpose of this paper is to compare the differences of behaviour and performance between small and medium-sized indigenous firms (IFs) and Japanses joint ventures (JJVs) operating in Korea. The results of bivariate analyses of behavioural differences between the two groups show that IFs exhibit more effort in technology assimilation and also show a greater interest by top management in innovation compared with JJVs. IFs also place greater importance on long range planning/forecasting formand for technology and investment while JJVs are more export-oriented and place greater importance on long range planning/forecasting for market demand. IFs tend to be more innovative but less productive than JJVs.

Ethanol fermentation of cassava starch pretreated with alkali

Biotechnology and BioengineeringVolume 28, Issue 4 p. 627-630 Communications to the EditorFree Access Ethanol fermentation of cassava starch pretreated with alkali Y. C. Shin, Y. C. Shin Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorS. Y. Lee, S. Y. Lee Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorY. K. Choe, Y. K. Choe Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorH. S. Kim, H. S. Kim Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorS. M. Byunt, Corresponding Author S. M. Byunt Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaDepartment of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this author Y. C. Shin, Y. C. Shin Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorS. Y. Lee, S. Y. Lee Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorY. K. Choe, Y. K. Choe Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorH. S. Kim, H. S. Kim Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this authorS. M. Byunt, Corresponding Author S. M. Byunt Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaDepartment of Biological Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), P.O. Box 150 Chongryang, Seoul 131, KoreaSearch for more papers by this author First published: April 1986 https://doi.org/10.1002/bit.260280424AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Volume28, Issue4April 1986Pages 627-630 ReferencesRelatedInformation

Urea release from silicate- and polymer-coated urea in water and a simulated wetland soil

Urea release rates in water (38°C) and in a simulated wetland soil system under greenhouse conditions from silicate- and polymer-coated urea (SPCU) materials have been studied. The SPCU materials were prepared by the Korea Advanced Institute of Science and Technology (KAIST), Seoul, Korea, in cooperation with the International Fertilizer Development Center (IFDC). Average urea release (\(\overline {UR} \)) in water was mainly a diffusion-controlled, concentration-gradient dependent process. It was markedly influenced by the extent of swelling of the coatings of granules. Under unrestricted swelling condition,\(\overline {UR} \) versus time gave an s-shaped curve with three distinct periods: namely, a delayed period, a maximum-rate period, and slow-rate period.\(\overline {UR} \) versus time curves for SPCU after placement at 0- to 2-, 5- to 10- and 10- to 15-cm depth in a simulated wetland soil system were, in general, sigmoidal but different from those in water. They were influenced by placement depths of SPCU granules in the soil, and the order of\(\overline {UR} \) at the soil depths studied was: 0–2 cm, < 5–15 cm ⩽ 10–15 cm.