• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.31-36
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• 2004

Defective components of interest include not only homogeneous components, but also components with weldments where tensile properties vary across the weldment. Noting that the region near the weldment is the most vulnerable place for crack initiation and subsequent growth, defect assessment methods for homogeneous structure. Moreover, weldment width and crack location also affects the deformation and fracture behavior of the welded joints. These weld characteristics can evaluate using plastic limit load. So in this paper, evaluate plastic limit load both full circumference part-throughwall cracked pipes and circumference through-wall cracked pipes considering weld characteristics. And using evaluate results, proposed J-integral and crack opening displacement(COD) estimate method based on reference stress method.

• 한국콘텐츠학회논문지
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• 제6권4호
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• pp.55-62
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• 2006

유비쿼터스 시대가 시작되면서 유비쿼터스 환경을 어떻게 제시할 것인지와 어떤 서비스와 이용 방법을 사용자에게 제공할 것인지가 중요해지고 있다. 본 논문에서는 모바일 환경에서 지능형 멀티 에이전트를 통해 사용자에게 도움되는 정보를 능동적으로 제공할 수 있는 시스템을 제안한다. 프로파일 모듀르 규칙 생성 모듈, 필터링 모듈, 서비스 모듈 구조로 구성된다. 추천 에이전트를 이용하여 미리 등록한 사용자의 정보를 기반으로 지능적인 사용자의 요구 파악을 가능하게 구성하였다. 이것을 응용하여 구현하고 실험을 통해 확인하였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제24권2호
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• pp.15-25
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• 2018

Purpose: The important things in space plan of a screening center are improving the spatial awareness by space systemization and minimizing the examination time for customers, and reducing the required time of screening work and maximizing the capacity for the screening center. Therefore, we tried to solve the problem of improving spatial awareness and reducing the examination time by using the pedestrian based discrete event simulation at the minimum cost. Methods: We have analyzed the drawbacks and the supplement points by comparing the floor plan at the time of opening and the current floor plan. Based on the analysis, we propose an improved plan which changes the location of the examination rooms and the number of services, and we also verify the improved plan based on simulation analyses. Results: 1) Through the analyses, we derived the drawbacks of the floor plan at the time of opening, and we realized that the current floor plan reflects the drawbacks. 2) The major reasons of the long examination time are the human traffic jam and the occurrence of queues due to unreasonable allocation of services. 3) Through the discrete event simulation analyses, it was possible to specify the place of the queues manually so as to use the given space fairly. 4) Using the discrete event simulation, it was possible to reduce the examination time and to improve the spatial awareness effectively at the minimum cost. Implications: Although the proposed simulation methodology in this paper is an analysis of the existing screening center, we expect that the proposed methodology will be used to develop a more efficient architectural design process by pre-applying the method to the course of designing a screening center and finding the suitability of the proposed method with the matched number of services.

• 한국실내디자인학회논문집
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• 제21권1호
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• pp.228-239
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• 2012

This study aims to propose the improvement direction of spatial organization of orphanage facilities by reflecting the international trend of child welfare facilities including 'enhancement of habitability', 'opening to the local community' and 'multi-functionality' on the basis of ideas of 'right of housing' and 'normalization'. Orphanage facilities are evolving from 'facilities' to accommodate unfortunate children to the concept of the 'community-care', and the residential space is also rapidly shifting to 'cottage' type resembling a residential type of ordinary family so as to enhance the self-esteem and relationship. To suggest the future-oriented changeability of current orphanage facilities, the present study conducted a nationwide survey of child welfare facilities and four Visiting researches of cottage type orphanage with different locations to investigate the appropriateness of housing type, organization of common use space, mode of management and facilities criteria. The results of this study are following: 1) For enhancement of habitability it is suggested that cottage type with various plans in the form of ordinary housing is appropriate, that the number of children per cottage is six or so, and that the number of less than two or three children per room is recommended. At the same time the adjustment of facilities criteria, simplified or complex, is suggested to support a similar residence pattern to ordinary home. 2) Specialized programs must be introduced to establish a base of welfare-network for community children according to features of location and a complex management must be sought in the connection with neighboring public facilities. 3) To secure the residential environment and quality of life for children, the concept of a simple playground space by the current facilities criteria must be broken away to reinforce the network of various outdoor spaces closely connected with living space.

• 보건행정학회지
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• 제25권3호
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• pp.240-251
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• 2015

Background: Dentist's income is quite variable. We investigate the factors underlying the distribution of dental revenue and dentist income. Methods: Financial and structural variables of private dental practices(N=13,967) were examined with 2010 Economic Census microdata which include non-insurance revenue. We conducted quantile regression method(QRM) and ordinary least square(OLS) in treating skewness and heteroskedasticity of distributions. The effective estimation for the upper and lower range of distribution becomes possible by QRM. Results: Mid-career dentists are shown to have higher revenue and income. Male dentists achieve the higher revenue and income than female dentists in all quantiles. Group practices show lower income per owner than solo practices significantly. The revenue and income are increased with increasing size of clinics. The high cost in renting the clinic office is found to have a big positive effect on the revenue but a little positive effect on the income. Interestingly the density of dentists shows negative effect on the lowest quantile of the revenue but positive effect on the highest quantile. The lowest quantile of the revenue in the capital areas have the relatively high revenue. The lowest quantile of the income in metropolitan city show higher income than those in other areas significantly. Conclusion: The suggested QRM is shown to have more effective and efficient tool in finding out determinants of dentists' revenue and income of our concern. The results of this study are expected to be employed for dentists preparing for the opening practices in their organizational settings and locational selections. The distributional efficiency of dental human resources could be accomplished if policy makers guide dentists with this knowledge.

• 치과방사선
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• 제27권1호
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• pp.25-41
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• 1997

The purpose of this study was to observe mandibular condyle shape and position in an asymptomatic population. In order to carry out this study, 142 temporomandibular joints in 71 adults(35 males, 36 females), who were asymptomatic for temporomandibular joint disorders and had no history of prosthodontic or orthodontic treatments, were selected, and radiographed using the Accurd-200 head holder(Denar Co., U.S.A) for transcranial radiograms and the Sectography(Denar Co., U.S.A) for lateral individualized corrected tomograms. Mandibular condyles were classified morphologically and evaluated in positional relationships with articular fossae and articular eminences at centric occlusion and 1 inch mouth opening. The obtained results were as follows; 1. In the classification of mandibular condyle shape, the convex type was more prevalent in transcranial radiograms and tomograms taken at medial, central, and lateral locations. 2. In the mandibular condyle position at centric occlusion, the mandibular condyles were placed posterior to the center of articular fossae in transcranial radiograms and anterior to the center of articular fossae in tomograms taken at medial, central, and lateral locations. 3. In the mandibular condyle position in right and left TMJs at centric occlusion, the mandibular condyles were placed bilateral asymmetric relationships to the articular fossae in transcranial radiograms and tomograms taken at medial, central, and lateral locations. 4. In the mandibular condyle position at 1 inch mouth opening, the mandibular condyles were placed anterior to the articular eminences in transcranial radiograms and tomograms taken at central location and posterior to the articular eminences in tomograms taken at medial and lateral locations.

• Spatial Information Research
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• 제8권2호
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• pp.183-189
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• 2000

동양인의 우주관에 따르면 모든 시스템은 시간·공간·인간이라는 세 요소를 갖출 때 비로소 완전해진다. 이 세 요소를 결합시킬 수 있는 유일한 컴퓨터 기술이 바로 GIS이다. 그러나 현재 활용되는 GIS데이터베이스와 시스템 구조는 대부분 시간요소와 인간요소를 배제한 채 주로 공간 위주의 자료를 관리하고 분석 처리하는 정도에 그치고 있다. 그렇지만 GIS기술은 앞으로 시간·공간·인간의 세 요소 결합체로 발전해 나갈 것임에 틀림없다. 한편 최근 인터넷이 보편화하면서 그 속에 ¨사이버 세계¨라는 새로운 소우주가 생겨나고 있다. 그러나 인터넷만으로는 공간적 개념이 없는 반쪽의 소우주밖에 만들 수 없다. 인터넷과 GIS기술을 합칠 때 비로소 컴퓨터와 정보통신망 속에 우리의 생활공간과 흡수한 ¨사이버 국토공간¨을 건설할 수 있다. 현재 세계 각국은 GIS분야에 엄청난 투자를 하고 있다. 이 같은 속도로 보아 몇 년 자나면 머지않아 ¨사이버 국토공간¨ 개념은 ¨사이버 지구공간¨ 개념으로 발전하여 이동전화기 하나만 가지면 언제, 어디서나 지구촌 곳곳을 탐색할 수 있게 될 것이다. 그렇게 되면 사이버 공간에 Digitiopia 즉 무릉도원을 건설할 수 있게 될 것이다. 이처럼 GIS가 인터넷과 결합하면서 우리에게 새로운 세상을 열어주고 있다.

• 대한토목학회논문집
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• 제41권5호
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• pp.571-580
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• 2021

철도역을 건설할 때 출입구는 많은 사람이 편리하게 이용할 수 있도록 적절한 위치에 배치되어야 한다. 그러나 건설비용 절감을 위해 출입구 설치 개수가 최소화되고 설치 위치도 이용자가 많은 곳에 배치되지 못하였다. 본 연구는 출입구 추가설치 시 경제적 효과로 보행교통류율, 점유공간, 이동(대기)시간 개선 정도를 이용하여 편익으로 산정하는 방법을 제시하였다. 특히, 개통되지 않은 철도역사의 외부에서 사람들이 특정 출입구를 이용하는 비율과 역사 내부에서 이동 경로별 이용자 수를 추정하는 방법을 제시하였다. 이 방법을 적용하여 실제 2025년 개통 예정인 신안 산선 광명역에 출입구를 추가로 설치할 때 효과를 분석하였다. 효과는 이동성만 개선되었다. 개통 첫해 이동성 개선 약 5.91억 원, 설치비용 75.8억 원이 산정되었고, 경제적 효과는 개통 후 30년 동안 B/C 1.21로 나타났다. 향후 기존 건설된 철도역뿐만 아니라 미개통된 철도역에서도 출입구를 추가로 설치할 때 이 방법을 적용하여 체계적인 효과분석이 가능할 것으로 기대된다.

• 대한토목학회논문집
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• 제41권6호
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• pp.715-725
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• 2021

철도역을 건설할 때 출입구는 많은 사람이 편리하게 이용할 수 있도록 적절한 위치에 배치되어야 한다. 그러나 건설비용 절감을 위해 출입구 설치 개수가 최소화되고 설치 위치도 이용자가 많은 곳에 배치되지 못하였다. 본 연구는 출입구 추가설치 시 경제적 효과로 보행교통류율, 점유공간, 이동(대기)시간 개선 정도를 이용하여 편익으로 산정하는 방법을 제시하였다. 특히, 개통되지 않은 철도역사의 외부에서 사람들이 특정 출입구를 이용하는 비율과 역사 내부에서 이동 경로별 이용자 수를 추정하는 방법을 제시하였다. 이 방법을 적용하여 실제 2025년 개통 예정인 신안 산선 광명역에 출입구를 추가로 설치할 때 효과를 분석하였다. 효과는 이동성만 개선되었다. 개통 첫해 이동성 개선 약 5.91억 원, 설치비용 75.8억 원이 산정되었고, 경제적 효과는 개통 후 30년 동안 B/C 1.21로 나타났다. 향후 기존 건설된 철도역뿐만 아니라 미개통된 철도역에서도 출입구를 추가로 설치할 때 이 방법을 적용하여 체계적인 효과분석이 가능할 것으로 기대된다.

• Steel and Composite Structures
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• 제33권4호
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• pp.569-581
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• 2019

Corrugated steel plate shear wall (CSPSW) as an innovative lateral load resisting system provides various advantages in comparison with the flat steel plate shear wall, including remarkable in-plane and out-of-plane stiffnesses and stability, greater elastic shear buckling stress, increasing the amount of cumulative dissipated energy and maintaining efficiency even in large story drifts. Employment of low yield point (LYP) steel web plate in steel shear walls can dramatically improve their structural performance and prevent early stage instability of the panels. This paper presents a comprehensive structural performance assessment of corrugated low yield point steel plate shear walls having circular openings located in different positions. Accordingly, following experimental verification of CSPSW finite element models, several trapezoidally horizontal CSPSW (H-CSPSW) models having LYP steel web plates as well as circular openings (for ducts) perforated in various locations have been developed to explore their hysteresis behavior, cumulative dissipated energy, lateral stiffness, and ultimate strength under cyclic loading. Obtained results reveal that the rehabilitation of damaged steel shear walls using corrugated LYP steel web plate can enhance their structural performance. Furthermore, choosing a suitable location for the circular opening regarding the design purpose paves the way for the achievement of the shear wall's optimal performance.