• 대한산업공학회지
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• 제32권4호
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• pp.323-337
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• 2006

Samsung, recognized as a global leading company, has huge and complex supply chain structures and has been improving them continuously for its fast-growing global businesses. SCM 6 Sigma is the state-of-the-art methodology developed through a combination of SCM innovation concepts accumulated from SCM Business Group in Samsung SDS and 6 Sigma which has successfully settled down as the management innovation tool for many companies in Samsung. The ultimate goal of SCM 6 Sigma is to train and develop future supply chain leaders who are more capable of leading SCM innovations. By leveraging the established 6 Sigma Belt System, Samsung aims to alleviate a shortage of SCM talents that has been a bottleneck in improving SCM performances at its group companies. This explains why SCM 6 Sigma is created. SCM 6 Sigma is the unique and critical component for Samsung to implement its various strategies for continuous improvement of its operations at a higher level of effectiveness and systematically as well. In return on these efforts, many SCM innovation projects have been successfully executed through SCM 6 Sigma up to today. In this paper, we introduce the methodology and explain the business rationale behind it together with its deployment case.

• 동력기계공학회지
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• 제16권2호
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• pp.66-74
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• 2012

In this paper, the authors propose a new approach to control a barge type surface vessel. It is based on the Dynamic Positioning System(DPS) design. The main role of barge ship is to carry and supply the materials to the floating units and other places. To carry out this job, it should be positioned in the specified area. However sometimes the thrust systems are installed on it, and in general the rope control by mooring winch system is used. It may be difficult to compare the control performances of two types. If we consider this problem in point of usefulness, we can easily find out that the winch control system is more useful and applicable to the real field than the thrust control system except a special use. Therefore, in this paper we consider a DPS design problem which can be extended to the many application fields. The goal of this paper is twofold. First, the sliding mode controller (SMC) for positioning the our vessel is proposed. Especially, in this paper, a robust stability condition is given based on descriptor system representation. In the result, the sliding mode control law guarantees to keep the vessel in the defined area in the presence of environmental disturbances. And second, the thrust allocation problem is solved by using redistributed pseudo-inverse (RPI) algorithm to determine the thrust force and direction of each individual actuator. The proposed approach has been simulated with a supply vessel model and found work well.

• 한국가스학회지
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• 제18권3호
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• pp.1-12
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• 2014

본 논문에서는 적외선센서를 이용하여 방폭형 휴대용 가연성가스 누출검지기를 개발하고 아울러 가스의 농도를 측정하는 정확도를 향상시키는 알고리즘을 제안하였다. 국내최초로 내압 및 본질안전방폭규격(Ex d ib) 적용하여 적외선 가스누출검지기는 개발하였으며, 선형회귀 방정식과 2차 라그랑지(Lagrange) 보간 다항식(interpolation polynomial)을 사용하여 측정정확도를 개선하였다. 아울러 본 연구에서는 현장검사원들의 요구사항을 조사하여 현장에 부합하도록 성능을 향상시키고, 편의기능을 추가하였다. 본 연구에서 개발한 가스누출검지기와 타사의 검지기를 비교하기 위하여 한국가스안전공사에서 제조한 표준가스 8종을 가지고 측정시험을 실시하였다. 본 연구에서 개발한 가스누출검지기의 검지 정확도가 우수함을 실험결과를 통하여 증명하였다.

• 대한교통학회지
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• 제20권3호
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• pp.69-82
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• 2002

본 연구는 도시고속도로 교통류의 효과적인 관리와 운영상태 평가에 사용되는 거시적 연속교통류 재현 모형의 성능 비교에 관한 연구이다. 연속교통류 재현을 위한 거시적 모형은 크게 단순연속방정식 모형과 가속도방정식 모형의 범주 안에서 여러 모형들이 개발되어져 왔지만, 국내에서는 이 두 모형들에 대한 성능 비교에 관한 연구가 미흡한 실정이다. 따라서, 본 연구는 대표적인 거시적 연속교통류 모형들의 성능평가를 통해서 개개 모형들이 가지고 있는 특징을 알아본 후 대도시 고속도로의 교통류 재현에 이용할 수 있는 모형을 선정한다. 모형의 성능 비교를 위해 거시적 연속교통류 모형 중에서 대표적인 5개 모형(Lax Method Model, Upwind Scheme Model, Hilliges' Model, Papageorgiou's Model, Cell-Transmission Model)을 선택하였으며, Numerical Example과 실측 현장자료를 이용하여 모형들의 성능 비교를 실시하였다. 가상자료를 이용한 분석방법에서는 대체로 모든 모형이 적절한 결과값을 보여주었지만, 단순 연속방정식 모형이 모형의 안정성과 교통상황 재현력 측면에서 볼 때 가속도방정식 모형보다 좀더 안정적인 결과값을 보여주었다. 현장자료를 이용한 분석방법에서는 미국의 Nimitz Freeway의 오전 첨두시 3시간 교통 자료(밀도, 교통량)를 이용하였다. 분석대상구간에 대한 모형성능 평가결과, 단순연속방정식 모형의 결과와 가속도방정식 모형의 결과가 유사하게 나왔으며. 비교적 계산식이 단순한 거시적 연속교통류 모형들도 분석대상구간의 혼잡상황을 어느 정도 잘 재현하고 있음을 보여준다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.314-314
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• 2013

Recently, flexibility is one of the hottest issues in the field of electronic devices. For flexible displays or solar cells, a development of transparent conductive electrodes (TCEs) with flexibility, bendability and foldability is an essential element. Hundreds of nanometers indium-tin-oxide (ITO) films have been widely used and commercialized as a transparent electrode, but their brittleness make them difficulty to apply flexible electronics. Many researchers have been studying for flexible TCEs such as a few layers of graphene sheets, carbon nanotube networks, conductive polymer films and combinations among them. Although gained flexibility, their transmittance and resistivity have not reached those of commercialized ITO films. Metal grids electrode cannot act as TCEs only, but they can be used to lower the resistance of TCEs with few losses of transmittance. However, the possibility of device shortage will be rise at the devices with metal grids because a surface flatness of TCEs may be deteriorated when metal grids are introduced using conventional methods. In our research, we have developed hybrid TCEs, which combined tens of nanometers ITO film and metal grids which are embedded in flexible substrate. They show $13{\Omega}$/${\Box}f$ sheet resistance with 94% of transmittance. Moreover, the sheet resistance was maintained up to 1 mm of bending radius. Also, we have verified that flexible organic light emitting diodes and organic solar cells with the TCEs showed similar performances compared to commercial ITO (on glass substrate) devices.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.118-119
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• 2013

High power, short wavelength red laser diodes (LDs) have attracted significant interests in a variety of fields due to their advantages in terms of reliability, compactness and cost. The higher brightness for human eyes is required, the shorter wavelength like 630 nm is necessary with higher output power. In this respect, LDs are promising as alternative candidates of gas or dye lasers for such applications due to their small size, high optical/electrical power conversion efficiency, robustness and so on. The crystalline quality of GaInP-AlGaInP multiple quantum wells (MQWs) and AlInP cladding layers is a crucial part in the device performance of GaInP red LDs. Here, we first investigated the effect of Si diffusion on the optical properties of GaInP-AlGaInP MQWs grown with different growth temperatures. Secondary ion mass spectroscopy (SIMS) measurements revealed that both the Mg and Si diffusion into MQW active region was significant. To reduce such diffusion, we employed undoped Mg and Si diffusion barrier and could improve the properties.Without both Mg and Si diffusion barriers, no lasing emission was observed. However, lasing emission was observed clearly for the red LDs with both Mg and Si diffusion barriers. We then investigated the temperature dependent optical properties of MQW layers grown with different well thicknesses (6, 8 and 10 nm). When the well thickness was 10 nm, the better crystalline quality was obtained. However, the observed LD performances were similar, probably due to the defects and impurities in the AlGaInP layer. Further investigation with the detailed analyses will be presented later.

• Journal of Biosystems Engineering
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• 제35권4호
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• pp.257-261
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• 2010

Surface energy is the principal factor of anti-condensation. High surface energy appears hydrophilic itself and low surface energy represents hydrophobic itself. The contact angle is widely being used for measurement of surface energy of materials, evaluation of coating performances, measurement of wettability, and so on. However, the existing contact angle measuring system is so expensive for purchasing and complicated, so it takes a lot of time and money to use. This study was conducted to develop the algorithm for evaluating hydrophilic performance through measuring the contact angle of water droplet automatically, and fabricate relatively simple measuring system using a low-cost monochrome camera and image processing. A constant amount of water was firstly allocated on a slide by a micropipette, and then the image of water droplet was captured by monochrome digital camera and sent to a computer. The image was binarized and then reduced noises by labeling. Finally, the contact angle of water droplet was computed by using three points (left, right, and top coordinates), simple linear mathematics, and trigonometric function. The experimental results demonstrated the accuracy and reproducibility of the developed system showing less deviations and deviation ratio.

• 한국생활과학회지
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• 제20권3호
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• pp.691-711
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• 2011

This study examines the preliminary license and approval facilitation standards for improvements in quality for childcare centers focusing on the number of children, building space standards, facilities and equipment, and childcare program. Data from 48 caese was collected from childcare centers nationwide in Korea through a questionnaire and building plan. The first step for starting care licensing is to work out the ages and numbers of children within four or five age ranges. The second step is to work out the number of children as small, medium, or large considering staff to child ratios and building size. The Nnext step is to make a choice about childcare service quality classification as minimum, fair, or good, considering space requirements per child for the building, the classroom and the outdoor playground. The next step is to make a choice of space organization relating to service programs, considering the sleeping and eating area, indoor play area, toilet & washing facilities, classroom layouts such as cluster type, double zone type, single zone type, and others. Also, each room and entrance, office, kitchen, storage, laundry, teacher's area, and chilldren's area, need to be checked for space requirements and performances. The last step is to arrange the childcare program with the building and site plan. In conclusion childcare service quality will get better by upgrading of license regulation especially in minimum space requirements per child, corresponding with an increase in GNP and housing area per person. This is needed for childcare licensing in order to determine the quality level of childcare service.

• 한국콘텐츠학회논문지
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• 제16권2호
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• pp.221-230
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• 2016

최근 교량의 장수명화와 이용자의 안전을 보장하기 위한 첨단IT기술을 이용한 유지관리 기법이 세계적으로 각광을 받고 있다. 이에 본 논문에서는 무선계측센서를 이용하여 교량의 정적 동적 데이터를 취득 및 분석하여 교량의 거동상태를 실시간으로 모니터링 할 수 있는 지능형 교량 구조 건전성 모니터링시스템을 개발하였다. 본 논문에서 개발한 모니터링 시스템은 교량의 주요 부재의 거동을 계측하기 위한 센서 및 계측데이터 전송을 위한 무선송수신시스템, 전체 시스템 관리를 위한 운영프로그램 및 데이터베이스로 구성되어 있다. 개발한 무선계측센서 기반의 모니터링 시스템의 성능검증을 위해 올림픽대교에 5종의 무선계측센서를 설치하였으며, 센서의 전원은 태양광 발전장치를 설치하여 자가 전원공급이 가능하도록 하였다. 성능검증을 위한 데이터는 시스템 구축완료 후 일주일간의 데이터를 활용하여, 유선시스템으로부터 취득된 데이터와 비교 분석하였으며, 이를 통행 지능형 구조 건전성 모니터링 시스템의 성능 및 실 교량 적용성을 검증하였다.

• 한국산학기술학회논문지
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• 제15권11호
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• pp.6472-6477
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• 2014

본 연구는 최근 영역을 넓히고 있는 일러스트 작가의 아트마케팅 트랜드를 살펴보고 색조화장품의 디자인 컨셉을 제안하고자 한다. 아트마케팅은 문화마케팅의 한 종류로 전시, 공연, 기타 예술 활동을 통한 마케팅을 의미한다. 아트와 생활의 경계가 모호해 지고 아트적인 모티브가 제품 속으로 녹아들고 아트적 속성이 다시 캔버스에 반영될 수 있는 자유로운 감성 표현이 주목받고 있다. 일러스트 작가의 작품들이 캔버스가 아닌 생활속의 아이템으로 영역을 넓히고 있는 것이다. 본 논문에서는 아트마케팅을 반영한 색조화장품 디자인을 제안하였다. 디자인 컨셉을 제안한 주요 타켓층은 20대 초중반의 젊은층으로 그들은 트랜드 지향적이며 개성이 강하고 스스로 인정받고 싶어하는 경향이 있다. 색조화장품 패키지 디자인에 디자인 컨셉을 강조하기 위하여 현란하고 강렬한 색상조합으로 타겟 계층의 진취적인 이미지를 반영하였다. 아트적인 무드가 생활속에 파고 들면서 우리 생활에 문화적 가치와 의미를 제공하고 있음을 알 수 있다.