• 산업경영시스템학회지
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• 제35권3호
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• pp.192-203
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• 2012

As a leading nation of ubiquitous technology, South Korea has been promoting u-City pilot projects throughout the country. According to 'Fundamental Construction Law of u-City,' u-City projects are classified into old-town and new-town types. However, most projects have focused only on the new-town type. Pushing forward large-scale land development projects, Korea Land and Housing Corporation (LH Co.) under Ministry of Land Transport and Maritime Affairs (MLTM) has gained a development profit out of the u-City infrastructure and then donated the infrastructure to a local government without making any plan for operations. In the process of u-City pilot projects, old-towns have been relatively ignored and various of unexpected problems have emerged. Building the u-City of an old-town is not easy due to many constraints such as huge initial investment, long validity and verification procedures, lack of useful services for citizens, lack of professional outsourcing methods for business promotion, high operating costs of the integrated control center, inadequate law related, insufficient institutional requirements and so on. This paper introduces a case study on u-City development for an old-town, Ansan City, as a private investment project. The case will help boost u-City projects for old-towns by solving their problems and providing an effective operational mechanism. As the first BTL (Build-Transfer-Lease) project for constructing u-City, 'Broadband Information Network Development Project' of Ansan City will provide a reference model of expanding u-City projects for other cities.

• 한국철도학회논문집
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• 제17권2호
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• pp.114-122
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• 2014

지지력과 주행쾌적성을 개선시키기 위하여 아스팔트노반의 도입이 고려되고 있다. 다져진 아스팔트 혼합물의 동탄성계수는 아스팔트 노반설계에 있어 매우 중요한 설계입력요소이다. 동탄성계수($E^*$)를 획득하기 위하여 사용할 수 있는 간이 시험법으로서 소형충격공진시험 및 초음파시험의 사용적합성을 분석하였다. 간이 시험법에 의한 시험결과의 신뢰도를 검토하기 위하여 혼합물의 동탄성계수 예측식으로 사용되는 AASHTO 2002 MEPDG 제안식 및 한국형 포장설계법(KPRP)에서 제시한 예측식 계산 결과와 간이 비파괴시험법에 의한 취득결과를 비교, 분석하였다. 분석한 실험결과는 추가시험과 보완을 통해 철도 아스팔트 노반설계를 위한 간이시험법으로 적용할 수 있을 것으로 판단되었다.

• Bulletin of the Korean Chemical Society
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• 제29권2호
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• pp.422-426
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• 2008

Hemodialysis graft coated with paclitaxel prevents stenosis; however, large initial burst release of paclitaxel causes many negative effects such as drug toxicity and inefficient drug loss. Therefore we developed and tested a novel coating method, double dipping, to provide controlled and sustained release of paclitaxel locally. Expanded polytetrafluoroethylene (ePTFE) grafts were dipped twice into a solution of several different paclitaxel concentrations. In vitro release tests of the double dipping method showed that early burst release could be somewhat retarded and followed by sustained release for a long time. We observed the effect of paclitaxel coating by double dipping in porcine model of arterio-venous (AV) grafts between the common carotid artery and the external jugular vein. 12 weeks after constructing AV grafts, cross sections of the graft venous anastomosis were obtained and analyzed. Paclitaxel coated ePTFE grafts by double dipping were observed to prevent neointimal hyperplasia and therefore reduced stenosis of the arteriovenous hemodialysis grafts, especially at the graft venous anastomosis sites. Our results demonstrate that second dipping of ePTFE graft, which was already coated once with paclitaxel, washes off the drug on a surface of the graft and affects the ratio of paclitaxel on the surface to that of the inner space, possibly by diffusion: thus the early burst of drug can be somewhat reduced.

• Journal of Welding and Joining
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• 제26권4호
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• pp.79-84
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• 2008

Use of sheet metal structure is increased in various fields such as automobile, aerospace and communication equipment industry. When this structure is welded, welding distortion is generated due to the non-uniformity of temperature distribution. Recently welding distortion becomes a matter of great importance in the structure manufacture industry because it deteriorates the product's quality by bringing about shape error. Accordingly many studies for solving the problems by controlling the welding distortion are being performed. However, it is difficult to remove all kinds of distortion by welding process, though various kinds of methods for reducing distortion are applied to production. Consequently, straightening process is operated if the high precision quality is requested after welding. The local heating method induces compression plastic deformation by thermal expansion in the heating stage and then leaves constriction of length direction in the cooling stage. Accordingly, in the case of sheet metal structure, straightening effect is expected by heating for the part of distortion. This study includes numerical analysis of straightening effect by the local heating method in distortion comes from production of welded sheet metal structure. Particularly straightening effect followed by dimensions of heating area is analyzed according to the numerical analysis. The numerical analysis is performed by constructing 3-dimensional finite element model for 0.4mm stainless steel-sheet metal. Results of this study confirm that straightening effect changes as heating area increases and the optimum value of heating area that proves the maximum straightening effect exists.

• 한국환경교육학회지:환경교육
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• 제12권1호
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• pp.189-204
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• 1999

Recently, the interest in artificial environment made by mankind as well as natural environment has been increased. This interest in the environment began to be reflected in the physical education, which environmental problems affect modern people's living quality as a crucial factor affecting directly or indirectly our life. Furthermore, since we entered the era of mass sports the physical education subject has dealt with destruction of natural environment by constructing golf courses, ski slopes, etc., destruction of ecosystem by water sports, mountaineering sports, aero sports, etc., and noise pollution near the sport facilities. Therefore, the purpose of this paper is to examine the means to reinforce environmental education in many ways in the physical education concerning environmental problems. For this purpose this paper analyzed the contents of the 7th curriculum for physical education which can be thought to be teaching materials for environmental education, and described the contents in detail. Also, this paper established the orientation and goals of environmental education in the physical education subject and examined some important teaching and learning methods. In addition, this paper suggested some considerations concerning environmental education and a textbook model for the development of physical education textbooks connecting with the 7th curriculum for physical education, which is to suggest a means to connect physical education with environmental education smoothly. The physical education has an attribute that its activities like swimming, climbing mountains, and camping are performed outdoor. The physical activities in the physical education are, of course, performed in the environment, so we had better implement the environmental education including such physical activities at the same time with physical education. Also, there should be efforts so that the education through environment, the education about environment, and the education in the environment can be implemented along with the physical education.

• 한국콘텐츠학회논문지
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• 제14권9호
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• pp.1-13
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• 2014

가상 세계의 에이전트의 설계를 위해서 물리적 사실감뿐만 아니라 동적으로 변하는 상황에 대응하는 에이전트의 다양한 물리적 행동들의 구현이 필수적이다. 본 연구는 다양한 행동을 구현하기 위한 기본 동작들을 재활용한 복합적 행동 및 에이전트가 즉시 주위의 환경에 반응할 수 있는 기법을 구현한다. 또한 관절에 대한 에이전트의 신체 구조를 설계하고 기본 동작 또는 복합 동작을 실시간으로 표현한다. 이 기법을 구현하기 위해서, 기본적인 관절 회전을 위한 애니메이션 함수와 기본 동작으로 이루어진 전체적 동작을 구성하는 기능을 구현한다. 이러한 동작들은 에이전트의 목적을 달성하는 계획에 포함될 수 있다. 즉, 재활용된 기본 동작을 이용하여 다양한 행동을 쉽게 생성하는 기법을 개발한다. 본 연구는 '걸으면서 먹다'와 같은 병렬 행동을 구현할 때 뚜렷한 장점을 가진다. 이는 두 개 이상의 행동들은 우선순위에 따라 자연스럽게 병렬 행동으로 조합된다. 이를 증명하기 위해 몇 개의 복합 행동 및 병렬 행동을 구현한다.

• 한국인터넷방송통신학회논문지
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• 제12권1호
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• pp.97-107
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• 2012

점차 인터넷이 다양하고 복잡해지고 사용자의 편리성 요구가 많고 다양해지고 있다. 사용자의 요구를 충족시키기 위해 미래의 인터넷을 어떻게 디자인 하는 것인지 그리고 이동성 관리는 고려되어야 될 메인 이슈중의 하나로 분산 시스템 구조에 방해가 되는 비용 비효율성 결과가 발생한다. 이 논문에서 우리는 미래의 모바일 인터넷 구조에 적용 가능한 새로운 기능-분산 이동성 관리 기술을 제안한다. 더불어 다양한 분석적 기법을 적용하여, 제안한 기능분산 이동성 시스템은 위치 업데이트 비용과 패킷 전송 비용 등의 비용 분석에서 우수한 성능을 보여준다.

• 산업경영시스템학회지
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• 제40권4호
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• pp.29-37
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• 2017

This papers focuses on remanufacturing processes in a closed loop supply chain. The remanufacturing processes is considered as one of the effective strategies for enterprises' sustainability. For this reason, a lot of companies have attempted to apply remanufacturing related methods to their manufacturing processes. While many research studies focused on the return rate for remanufacturing parts as a control parameter, the relationship with demand certainties has been studied less comparatively. This paper considers a closed loop supply chain environment with remanufacturing processes, where highly fluctuating demands are embedded. While other research studies capture uncertainties using probability theories, highly fluctuating demands are modeled using a fuzzy logic based ambiguity based modeling framework. The previous studies on the remanufacturing have been limited in solving the actual supply chain management situation and issues by analyzing the various situations and variables constituting the supply chain model in a linear relationship. In order to overcome these limitations, this papers considers that the relationship between price and demand is nonlinear. In order to interpret the relationship between demand and price, a new price elasticity of demand is modeled using a fuzzy based nonlinear function and analyzed. This papers contributes to setup and to provide an effective price strategy reflecting highly demand uncertainties in the closed loop supply chain management with remanufacturing processes. Also, this papers present various procedures and analytical methods for constructing accurate parameter and membership functions that deal with extended uncertainty through fuzzy logic system based modeling rather than existing probability distribution based uncertainty modeling.

• 한국기록관리학회지
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• 제20권1호
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• pp.139-158
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• 2020

본 연구는 2019년 12월에 ICA에서 발표한 보존기록의 기술표준인 RiC-CM v0.2 초안을 국내에 처음으로 소개하는 논문이며, 기록 현장에서 어떻게 적용해야 하는지를 고민한 초기 단계의 연구이다. 본 연구는 다음과 같은 절차에 의해 수행되었다. 첫째, RiC-CM v0.1과 v0.2의 각 개체, 속성, 관계를 비교·분석하였으며 이를 통해 버전 0.2의 주요 특성을 추출하였다. 둘째, 버전 0.2의 기본 원리와 추출된 특성을 고려하여 온톨로지를 구축하고 보존기록의 의미구조를 확인하고자 하였다. 의미구조를 구축하기 위해 온톨로지 언어를 지원하는 프로테제(Protégé)를 활용하였다. 셋째, 프로테제 사례 입력을 통해 버전 0.1과의 차이점을 확인하고 버전 0.2의 특성이 온톨로지로 어떻게 표현되는지를 살펴보았다.

• 한국조사연구학회지:조사연구
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• 제12권2호
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• pp.1-26
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• 2011

초고령(80세 이상) 사망률에 대한 양적, 질적 자료의 결여는 한국의 초고령 사망률에 대한 체계적인 연구의 최대 걸림돌이 되어 왔다. 그러나 세계가 경험해 보지 못한 한국의 급속한 고령화는 미래의 인구구조의 근본적인 변화를 초래하게 되어 초고령 사망률의 수준, 패턴, 그리고 추이분석은 더 이상 미룰 수 없는 과제가 되었다. 사망률 추이는 80세 이상(80+) 또는 85세 이상(85+)로 절단된 형태의 과거 사망률 자료를 115세까지의 각 세별 사망률로 확장하여 분석될 수 있다. 이러한 확장은 한국형 표준사망률의 작성이 우선되어야 가능하며 이 표준사망률을 통해 한국의 초고령 사망률의 수준과 패턴의 파악이 가능해진다. 한국형 표준 사망률의 작성은 하나의 관계모형과 11개의 함수로부터 도출되며, 성별로 최적의 모형은 적합도를 측정하는 세 가지의 통계량과 사망률의 세 가지 일치성을 기준으로 선택되었다. 본 논문에서는 작성된 표준사망률을 이용하여 과거의 절단된 사망률을 확장하였고 이 확장 과정에서 필연적으로 발생하는 종단면적인 사망률의 일치성을 해결하는 방안을 제시하였다.