• 한국재난정보학회 논문집
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• 제13권3호
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• pp.322-331
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• 2017

본 연구는 한국건설기술연구원(KICT)에서 제시한 토목공사용 정보분류체계(Information Classification System)를 기반으로 지하철공사의 정보분류체계를 제시하였다. 그리고 이 기준을 근거로 NAS(Network Analysis System) 운영체계인 공사정보분류체계 - 공정도표 - 작업별 투입 자원을 연동하는 데이터 모델링을 구축하여 통합 모형을 제시하였다. 따라서 본 연구에서 제시한 데이터 모델링의 통합모형은 다른 토목시설물공사에서도 동일한 절차와 방법으로 적용할 수 있어, NAS를 기반으로 한 공정관리 과학화를 유도할 수 있을 것으로 확신한다.

• 반도체디스플레이기술학회지
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• 제20권3호
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• pp.178-183
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• 2021

This paper describes a dynamic spectroscopic ellipsometry based on dual-wavelength calibration. DSE provides ellipsometric parameters at rates above 20 Hz, but the interferometer's sensitivity to temperature makes it difficult for that proposed system to maintain stable 𝜟k over long periods of time. To solve this problem, we set up an additional path in the DSE to perform simulations of the polarization phase calibration method using dual wavelengths. Through simulation, we were able to eliminate most of the polarization phase error and maintain a stable 𝜟k in the long-term stability experiment for 10 hours. This is the result that the 𝜟k stability of the proposed system is improved tens of times compared to the existing system.

• 한국해양공학회지
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• 제35권1호
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• pp.1-12
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• 2021

As increasing the international community's awareness of greenhouse gas reduction, the demand for eco-friendly ship fuel has accelerated recently. The fundamental aim of this study is to develop a new type of fully electrified ferry for passengers and cars considering Korean domestic coastal environmental conditions. Several technical difficulties are encountered in applying a fully electric propulsion system based on removable battery systems into a ship due to limitations imposed by the batteries' size and capacity. This paper reviews and analyzes marine environment regulations strengthened recently, technology trends related to fully electric propulsion vessels in each country, and Korean domestic coastal environments. We propose a new fully electrified car ferry design with a displacement of 400 t applied in Korea. It is powered by removable battery systems pre-charged in a safe inland charging station. The mobile battery system is developed to enable roll-on and roll-off using wheels. The characteristics of the ship motion are analyzed based on the weight and location of the battery systems. We expect our battery systems to be applicable to larger ships in the future.

• Journal of information and communication convergence engineering
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• 제1권3호
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• pp.157-162
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• 2003

We propose a learning method for improving the performance of the backpropagation algorithm. The proposed method is using a fuzzy logic system for automatic tuning of the learning rate of each weight. Instead of choosing a fixed learning rate, the fuzzy logic system is used to dynamically adjust the learning rate. The inputs of fuzzy logic system are delta and delta bar, and the output of fuzzy logic system is the learning rate. In order to verify the effectiveness of the proposed method, we performed simulations on the XOR problem, character classification, and function approximation. The results show that the proposed method considerably improves the performance compared to the general backpropagation, the backpropagation with momentum, and the Jacobs'delta-bar-delta algorithm.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1642-1647
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• 2004

In this article, we present the development of the automated system for adjusting the 6 D.O.F circular fixator. The system includes scheduling software to adjust the Hexapod Circular Fixator (HCF) and an automated strut system with the ability of the multiple synchronized motion. HCF was designed to control a 6 degree-of-freedom Ilizarove fixator and it's mechanism is known as the Stewart Platform. HCF scheduler evaluates each value of altered length of the HCF struts to correct the complex skeletal deformity by using the X-ray data of the patient. The data of HCF scheduler feed into the automated strut system which be able to provide the scheduled adjustment and the automated strut is synchronized by input data.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2006년도 임시총회 및 추계학술발표회
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• pp.82-84
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• 2006

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2006년도 임시총회 및 추계학술발표회
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• pp.164-166
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• 2006

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1357-1360
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• 2004

In this paper, a prototype of agent-based engineering system is developed based on the AADE (autonomous agent development environment), a FIPA compliant agent platform. By applying several advanced technologies including software agents, Internet/Web, workflow and database, the developed prototype system is able to successfully fulfill our target of integrating personnel, design activities and engineering resources along a predefined engineering design project (workflow). A software prototype is implemented to integrate various engineering software tools including CAD, structural analysis (FEA), dynamic analysis, fatigue analysis. A wheel-axle-assembly (part of a bogie system) is chosen as a test case for the validation of the prototype system.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 추계학술발표논문집 1부
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• pp.378-381
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• 2010

본 논문에서는 LDO레귤레이터의 PSRR을 향상 및 전압가변 조정이 가능한 능동 Replica LDO 레귤레이터를 설계하였다. 일반적인 레귤레이터의 PSRR과 회로의 안정성 확보를 위해서 사용된 Replica회로의 경우, 안정된 동작을 유지하기 위해서는 DC 매칭이 이루어져야 한다. 본 논문에서는 능동 Replica LDO회로를 제안하였다. 제안된 회로는 CMFB회로에 의하여 DC 전위의 매칭이 이루어지도록 하였으며, 레귤레이터의 출력전압도 일정한 범위내에서 조정이 가능하다. 또한 HSPCIE시뮬레이션 결과, 제안된 능동 Replica LDO회로의 PSRR특성이 기존 LDO구조에 비하여 좋은 결과을 얻을 수 있음을 확인하였다.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2010년도 추계학술발표논문집 1부
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• pp.349-352
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• 2010

본 논문에서는 소규모의 태양전지를 전원으로 사용하며 LED 부하를 이용하는 소형 사인보드 시스템의 설계방법에 대해 제안한다. 소형 PVLED 시스템의 최적 설계를 위해 고려해야 하는 LED 부하의 운전 전력소비량에 대한 계산과 더불어 축전지, PV모듈 등과 같은 시스템 용량을 주변 환경을 고려하여 설계한다. 시스템 설계를 위해 LabView를 사용하였으며, 실제 사용현장에서 PVLED시스템의 효과적인 유지관리를 위한 고장 검출기능을 추가하였다.