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          • 전략적 건설지식체계구축을 위한 Framework 개발

            鄭榮洙,姜昇希,李揆現,崔寅星 명지대학교 산업기술연구소 2005 産業技術硏究所論文集 Vol.24 No.-

            The purpose of this paper is to develop a framework for construction knowledge management. The variables of proposed framework includes knowledge types strategic business functions, and engineering data types. Thus, This study defined knowledge types, strategic business functions, and engineering data types of a case study construction company in order to form a framework. A knowledge action plan of the case construction company was also developed by using the framework. The proposed framework and knowledge action plan for the company will contribute to develop knowledge management system related to engineering of strategic business functions.

          • 사례연구: 인터넷 방송의 스트리밍 기술을 이용한 실시간 원격학습 코스웨어 구현

            류준식,김상운 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

            In this paper, we design and implement a preliminary system of web-based real-time interactive courseware on a RealServer system by using the webcasting streaming technology and the Javascript language in order to increase of learning effects and its efficiency. From the experiments, it is known that internet service suppliers and client users could interact with each other efficiently in real-time through the implemented courseware.

          • 2축하중을 받는 이방성체에서 균열성장방향 예측

            임원균 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

            2축하중을 받는 이방성균열체에 대하여 해석을 수행하였다. 재료는 균질이방성체라고 가정하였다. 균열선단주위의 응력분포에 대한 급수전개식에서 2차항을 고려하여 응력식을 산출하였으며 이의 2차항은 균열성장각도의 정확한 예측을 위해서 매우 중요함을 보였다. 균열진전각도의 결정을 위해서 수직응력비 이론을 적용하였으며 넓은 범위의 작용하중에 대하여 해석을 수행하였다.

          • 합성재 개발

            노태익,이병하 명지대학교 산업기술연구소 2006 産業技術硏究所論文集 Vol.25 No.-

            The goal of this study is developing synthetic ash that has same qualities with natural ash in order to solve the problems of natural ash. In order to achieve the goal of this study, I analyzed the ingredients of natural ash (mixed ash) made from wood. Using seger's formula, I made four combinations of various materials, and put them under the test of albite-ash and UV analysis. As a result, I found that the synthetic ash that had closest qualities with natural ash's qualities had the composition as follows. PuYeo Albite 0.55%, Janggye Albite 23.63%, PuYeo Quartz 3.90%, ChungJu Limestone 54.47%, Ca₃(PO₄)₂ 2.20%, MgCO₃ 11.65%, Alumina 3.59%, Fe₂O₃ 2.00%, TiO₂ 0.60%, MnO₂ 0.61%. This synthetic ash also appears to have the same glaze effect with natural ash in the experiments of Kaolin-Silica addition using various clay bodies, when fired in reduction kiln atmosphere. The synthetic ash made from the mineral mixture following seger's formula shows excellent solubility and smoothness on ceramic as natural ash does. The synthetic ash does not show irregularity in the proportions of the ingredients in its composition and can be used as the material for the glaze such as Irabo glaze, Celadon glaze, Bunchung glaze, and Tenmok glaze. This synthetic ash is more convenient to acquire than natural ash : it also has merit and competitiveness in terms of economy.

          • 편광모드분산(PMD)보상을 위한 자동 편광제어기 구현

            여인영,신서용 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

            This paper deals with an implementation process of automatic polarization controller that was originated by our group before. The controller can mainly be used as a part of PMD(Polarization Mode Dispersion) compensator. To compensate PMD precisely, it is indispensible to have SOP(State Of Polarization) information of the dispersed signal. The controller we developed has a function of automatic tracking and control of randomly varying signal in a real time scale. It takes several milliseconds, which is 1,000 times faster than previously reported ones. Commercialization of the controller is also in progress with a production company.

          • 열처리가 Teflon^(??) FEP film의 전하보존특성에미치는 영향

            김성준,이현석,김지균,권정열,이헌용 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-

            In this paper, we studied the method of electrets electrode which formed to accumulate negative electric charges by corona discharges. The breakdown voltage samples and damaged samples by various corona discharges have made material stabilization and improved characteristics of electric charge storage throughout the annealing processes. After the experiment made material stabilization nearly melting point by many kinds of annealing conditions, we did the corona discharge again by the charged high voltages, a discharge electrode gap, and a discharged time. As we compared it with the best condition, we confirmed that characteristics of electric charge storages were improved.

          • 홀드릴링 방법을 사용한 금속의 잔류응력 해석

            이중원,박명균,박세만 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-

            Hole drilling method is one of the powerful methods to estimate the amount of residual stresses quantatively on metal alloy. Since the residual stress causes the degradation of the products in strength and poor products in quality it is necessary to find out the easy and efficient method. Present paper discusses the methodology how to estimate residual stresses and investigates the heat treatment effects on residual stresses using the hole drilling method for heat treated and non heat treated metal alloy. And to verify the results obtained from hole drilling method, the obtained results from resonance method were compared. The results show that they are well agreeable in tendency of stress distribution and that the amount of residual stress varies with drilling depth nonuniformly and the designer can more effectively control the residual stresses by being able to estimate heat treatment condition quantitative through the drilling hole method.

          • 무선 채널 STATE 모델 개발에 관한 연구

            한재충,정창환 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-

            It is crucial to analyse the wireless channel environment on developing the wireless communication system. Current wireless system, i.e., PCS or IMT-2000, was highly effected on Rayleigh fading, for using the high frequency bandwidth around 2GHz. This thesis will investigate the characteristic of Rayleigh fading channel, and develop a State model which enable to analyse the fading channel. We will develope the Finite-State Markov Model that is compensated for disadvantage of Gilbert Model and Hidden Markov Model(HMM) using now. This thesis also verify the efficiency of the developed State model using computer simulation.

          • 휴대폰 폴더 개폐 시 바디 부에 걸리는 응력집중현상

            구재경,엄태선,박명균,박세만 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-

            An experimental method involving electrical resistant strain gages and the computational method of the Finite Element Technique are employed to determine the location of the stress concentrations for the cellular phone. The results show that this area is highly susceptible to the hinge and it vicinity between folder and the body is found to be the most stress this area is highly susceptible to the Possible initiation of the crack leading to the complete failure and malfunction failure of the phone. Three different materials are considered to be possible candidates to replace the current materials. The higher the young's modules the lower the stress concentrations at the hinge area.

          • 진행파와 상호상관함수를 이용한 HVDC 케이블 고장점 표정 알고리즘

            柳基燦,姜相熙 명지대학교 산업기술연구소 2007 産業技術硏究所論文集 Vol.26 No.-

            For a safe operation of HVDC systems, the fault location and clearance of faults in the HVDC cables are important. In the past, search coil method and murray loop methods are mainly used for the fault location. But the results of these methods depend On existence of assistance cables and fault resistance and broken cables. The environment of fault location also affects the result of the fault location. To complement these problems, in this paper, fault location method using traveling wave and cross correlation is proposed for HVDC cable faults. In other words, the times those are the instants of the first incident and the second incident are found by using cross correlation. And fault location is calculated by using the difference time of two incidents and a velocity of the traveling wave. For case study, HVDC cable system modeling is accomplished by EMTDC/PSCAD and the algorithms are developed by using Matlab V7.1 and microsoft visual C++. To acquisite the fault data, IEC 61850 based IEDs are constructed. In this system, the proposed algorithm is implemented and verified by using the fault data that can be acquisited from IEC 61850 based IED.

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