• Proceedings of the KSME Conference
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• 2003.04a
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• pp.149-156
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• 2003

Recently, the importance of plant maintenance(PM) was highly raised to provide efficient plant operation which highly affects the productivity. For this reason, a number of engineering methodologies, such as riskbased inspection(RBI), fitness for service guidelines(FFS), plant lifecycle management(PLM), have been applied to improve the plant operation efficiency. Also, a network-based business operation system, which is called ERP(Enterprise Resource Planning), has been introduced in the field of plant maintenance. However, there was no attempt to connect engineering methodologies to the ERP PM system. In this paper, a knowledge-based information system for the plant operation of steel making company has been proposed. This system, which is named as K-VRS(Knowledge-based Virtual Reality System), provides a connection between ERP plant maintenance module and knowledge-based engineering methodologies, and thus, enables network-based highly effective plant maintenance process. The developed system is expected to play a great role for more efficient and safer plant maintenance.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.27 no.11
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• pp.1933-1940
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• 2003

Recently, the importance of plant maintenance(PM) was highly raised to provide efficient plant operation which highly affects the productivity. For this reason, a number of engineering methodologies, such as risk-based inspection(RBI), fitness for service guidelines(FFS), plant lifecycle management(PLM), have been applied to improve the plant operation efficiency. Also, a network-based business operation system, which is called ERP(Enterprise Resource Planning), has been introduced in the field of plant maintenance. However, there was no attempt to connect engineering methodologies to the ERP PM system. In this paper, a knowledge-based information system for the plant operation of steel making company has been proposed. This system which is named as K-VRS(Knowledge-based Virtual Reality System), provides a connection between ERP plant maintenance module and knowledge-based engineering methodologies, and thus, enables network-based highly effective plant maintenance process. The developed system is expected to play a great role for more efficient and safer plant maintenance.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.145-149
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• 2006

Building Information Modeling (BIM) is the process of integrating and re-using information generated and used throughout the lifecycle of a building. BIM may not be very different from other management methods in that it aims to minimize the economic loss and maximize the profit by designing, building, and maintaining a building better, faster, yet cheaper. The major difference between BIM and other methods is that BIM approaches the goal from a system point of view whereas other methods generally approaches the goal from a business management point of view. Since a project cannot succeed without considering both systematic and managerial aspects of a project, the line has been blurred these days. This paper explores a historical background of BIM and discusses the key technologies for successful implementation of BIM.

• Proceedings of the Korea Society for Simulation Conference
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• 2005.11a
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• pp.8-12
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• 2005

최근 마이크로 센서와 무선 통신 기술의 진보는 센서 네트워크의 발전을 가능하게 하였다. 이와 같은 사실은 무선 센서 네트워크를 위한 수많은 라우팅 프로토콜의 개발로 이어졌으며, 다양한 구조의 알고리즘들이 제안되었다. 특히, 디렉티드 디퓨젼(Directed Diffusion; DD)은 데이터 중심 기반의 라우팅 알고리즘으로 속성 칼 쌍을 이용하여 통신하는 센서 네트워크의 한 패러다임이라고 할 수 있다. 그러나 기존의 DD에서는 작업을 요청하는 질의 메시지(interest message)가 전체 센서 네트워크에 플러딩(flooding)되는데, 이러한 과정은 에너지 소비 측면에서 볼 때 매우 비효율적이라고 할 수 있다. 이와 같은 문제를 해결하기 위하여 본 논문에서는 센서 노드의 에너지와 밀도 정보를 고려한 임계값을 이용하여 데이터의 전송 지역을 제한함으로서, 네트워크의 에너지 소비를 줄일 수 있는 새로운 메시지 전달영역 제한기법(propagation limiting method; PLM)을 제안한다. 퍼지 규칙 기반 시스템은 센서 필드에 배치된 노드들의 에너지와 밀도 정보를 입력 파라미터로 사용하여 메시지 라우팅을 위한 임계값 결정에 사용된다 본 연구에서 제안된 기법을 사용하여 센서 네트워크의 에너지 소비를 실험한 결과 기존에 제안되었던 알고리즘들에 비해 상대적으로 높은 효율성을 나타내었으며, 전체적으로 네트워크의 수명도 연장할 수 있었다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.17 no.9
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• pp.951-962
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• 1992

The layout of electrical power distribution networks never involved communications aspects. As a result their transmission properties severly complicate the use as data links. Futhermore bandwidth as well as transmission power is restricted. Nevertheless, power distribution net works represent a most attractive medium for digital communication purposes due to an ever increasing demand, e.g., for environment management of buildings, office automation, and remote meter reading or security monitoring. In this paper, a power line modem which is capable of transmitting and receiving data at 1200 bps using OOK-BASK through 220V AC power lines is implemented. The receiver includes noncoherent detector and performs soft decision. The OLM circuits can be simplified by use of microprocessor. The PLM also satisfies CENELEC, European standards, and can be applied to home automation system.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.5
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• pp.469-477
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• 2011

Nowadays, environmentally friendly technology is attracting considerable attention because of environmental pollution and the increasing price of raw materials. Korea has a high level of dependence on exports, and therefore it has stressed the development of environmentally friendly technologies. Bicycle manufacturing industry has a bright future because bicycles do not use fossil fuels, and cycling is good for one's health. We develop a management system for the effective development of next-generation environmentally friendly technology for bicycles. The goal is to promote the bicycle industry in Korea while keeping the product in the low to medium price range.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.47 no.2
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• pp.47-55
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• 2010

The power line communication channel has characteristic variation problems which are caused by load. The spread spectrum technique has been used to overcome these problems. One of that is the direct sequence spread spectrum(DS/SS) system which is not necessary to additional hardwares. The BER of DS/SS system is decreased by longer length of PN code, but data transfer rate is decreases, so data transfer rate is hard to satisfies their own specifications especially in narrowband PLC systems. Spread Spectrum system with Dual-processing Gain tries to reflect cyclic characteristics of power line noise. But that system assumes that shapes of power line channel are symmetrical with respect to the 1/4 point of main frequency(60Hz in Korea), therefore cannot achieves various shapes of real power line noise. Thus in this paper, noise adaptive DS/SS system which PN code is changed by noise levels for various channel noises is proposed and simulated. The different kinds of noises are modeled and measured for simulation, the proposed system is verified that has lower data transfer rate and lower error rate than conventional system by simulation results.

• KIPS Transactions on Computer and Communication Systems
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• v.7 no.5
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• pp.111-118
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• 2018

The effects of the Fourth Industrial Revolution on manufacturing are spreading by policies to secure or strengthen the manufacturing competitiveness of each country. Strengthening policies on manufacturing necessitate nurturing manpower for smart manufacturing. This study examines the difference of the experts' perception about the educational curriculum to develop the knowledge of Product Lifecycle which covers the whole knowledge area of product development among the knowledge areas aimed at fostering the manpower of smart manufacturing for the $4^{th}$ Industrial Revolution Era. Experts were aware that future developments in digital development, production, and new product development are most important, and that they feel that the whole knowledge area is generally weak. In this study, the implications for the development of educational curriculum in the future are derived from the perception difference of knowledge on Product Lifecycle obtained through expert survey.

• Journal of Ocean Engineering and Technology
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• v.26 no.2
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• pp.58-67
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• 2012

Recently, both the integration of product data during design and production and the effective management of information during full lifecycles have attracted attention from shipyards and ship owners as a result of recycling regulations and a desire for efficient operations. Generally, PLM (Product Lifecycle Management) supports a collaborative environment during the BOL (Beginning of Life) stage, while an ALM (Asset Lifecycle Management) system provides all of the information required to maintain, overhaul, and discard/recycle all or part of a vessel during the MOL (Middle of Life) and EOL (End of Life) stages. The main goal of this paper is to suggest the fundamental configuration of a PALM (Product Asset Lifecylce Management) system and a method that can be used to utilize a marine vessel's lifecycle information during the MOL, emphasizing the maintenance information during the middle of life. The authors also suggest a PALM system configuration in which lifecycle information can be collected by a PEID (Product Embedded Information Device) integrating a microcomputer, sensors, and wireless network communication. Through a prototype PALM system, the suggested features and PALM system configuration are implemented.

• Journal of Korean Society for Atmospheric Environment
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• v.24 no.3
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• pp.346-356
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• 2008

Asbestos is the name of a group of minerals with long and thin fibers that originate naturally in the environment. Asbestos mainly affects lungs and the membrane that surrounds the lungs. In general, PCM (phase contrast microscopy) and PLM (polarized light microscopy) have been used to analyze asbestos fibers. However, these methods have often problems to over-estimate number concentration when counting real asbestos fibers. Moreover, there are many difficulties when separating and identifying various asbestos and non-asbestos fibers. In order to determine quantitative information on fibrous particles, source profiles for asbestos and non-asbestos fibers must be initially developed on the basis of their chemical compositions and physical parameters. In our study, a SEM/EDX was used to develop source profiles from known asbestos samples as reference samples. We could make the source profile matrix consisting of 6 types of asbestos fibers and 2 types of non-asbestos fibers by analyzing 380 fibers. Based on these profiles, a rule building expert system was developed by using the visual basic application (VBA). Various fibers were successfully classified by 2 simple rules in the EXCEL environment based on several visual steps such as inserting data, viewing results, and saving results. For a case study to test the expert system, samples from a construction materials and from various indoor environments such as a residental area, a preschool classroom, and an underground store were collected and analyzed. As a result of the survey, a total of 76 individual test fiber particles was well classified into 5 different types of particle classes; 9.3% of chrysotile, 15.4% of amosite, 0.8 of crocidolite, 4.2% of tremolite, 5.8% glass fiber, 21.1% of other fibers, and 43.5% of unknown fibers in terms of number concentration. Even though unknown portion was high, it will be decreased markedly when expanding fiber source profiles.