• 한국수자원학회논문집
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• 제43권1호
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• pp.41-49
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• 2010

본 연구의 계단형 보는 자연형 횡단 구조물의 한 형태로 제안되고 있다. 계단형 보 하류에서의 흐름은 기존 보(Round Crest Weir)에서 발생하는 도수와 달리 WTF(Wave Type Flow)라는 독특한 흐름이 발생한다. WTF는 계단형 보 하류에서 단차로 인해 발생되는 재순환영역(recirculation area)이 일정조건에서 발달하여 수면을 상승시키는 현상이다. WTF 조건에서의 파고는 하류수위(tailwater level) 보다 높아지고 WTF 구간에서의 최대유속발생이 수면에 가까운 곳에서 발생한다. 이와 같은 결과는 WTF 현상이 설계 시 접합부에 영향을 줄 수 있는 중요 인자임을 나타내는 것이다. 본 연구는 수리실험을 통해 WTF이 발생되는 수리조건과 WTF의 규모를 파악하였고 계단형 하류흐름조건에 따른 유속분포를 분석하였다. 본 연구의 결과는 계단형 보 설계 시 고려되지 못한 부분으로서 차후에 계단형 구조물 또는 계단식 변형 구조물 설계 시 주요 자료로 활용 될 것이다.

• 한국지반공학회논문집
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• 제21권1호
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• pp.29-41
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• 2005

우리나라의 소규모 항만이나 어항인 경우에 설계파는 낮지만 지반조건이 좋지 않은 경우가 많기 때문에 기존의 방파제 축조공법을 이용할 경우 비용이 커질 뿐만 아니라 건설재료의 확보가 어려운 실정이다. 따라서 설계파가 비교적 낮은 경우에 저렴하게 적용할 수 있는 새로운 형식의 방파제에 대한 수요가 증가함에 따라, 본 연구에서는 지반에 대한 특별한 처리 없이 간편하게 설치할 수 있는 가로널식 방파제를 개발하였다. 이 논문은 개발된 가로널식 방파제에 대해 방파제의 근입깊이 및 보강기법, 배치 형태 등 다양한 조건에 따른 방파제의 횡방향 거동을 분석한 것으로 이를 위해 느슨한 모래지반을 대상으로 모형 토조실험을 수행하였다. 실험 결과, 근입깊이 이외에도 경사 버팀보나 앵커등 보강재의 효과 및 방파제 배치 형식에 따른 경향을 확인하였다.

• Ocean and Polar Research
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• 제33권2호
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• pp.159-169
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• 2011

Antifreeze proteins (AFPs) have ice binding affinity, depress freezing temperature and inhibit ice recystallization which protect cellular membranes in polar organisms. Recent structural studies of antifreeze proteins have significantly expanded our understanding of the structure-function relationship and ice crystal growth inhibition. Although AFPs (Type I-IV AFP from fish, insect AFP and Plant AFP) have completely different fold and no sequence homology, they share a common feature of their surface area for ice binding property. The conserved ice-binding sites are relatively flat and hydrophobic. For example, Type I AFP has an amphipathic, single ${\alpha}$-helix and has regularly spaced Thr-Ala residues which make direct interaction with oxygen atoms of ice crystals. Unlike Type I AFP, Type II and III AFP are compact globular proteins that contain a flat ice-binding patch on the surface. Type II and Type III AFP show a remarkable structural similarity with the sugar binding lectin protein and C-terminal domain of sialic acid synthase, respectively. Type IV is assumed to form a four-helix bundle which has sequence similarity with apolipoprotein. The results of our modeling suggest an ice-binding induced structural change of Type IV AFP. Insect AFP has ${\beta}$-helical structure with a regular array of Thr-X-Thr motif. Threonine residues of each Thr-X-Thr motif fit well into the ice crystal lattice and provide a good surface-surface complementarity. This review focuses on the structural characteristics and details of the ice-binding mechanism of antifreeze proteins.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제20권4호
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• pp.57-65
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• 2014

Purpose : Mental health service desire has been diversified according to the increase of economic level and rapid social change. Mental Health and Welfare Center(MHWC) is a provider of mental health services in Japan. This is a basic stage study which will suggest the architectural planning guidelines for MHWC. Methods : Data were collected through literature research, field surveys, and expert interviews to 69 MHWC in Japan. 1) Research for the policy and legal aspects of mental health support system. 2) Research for structural aspects of MHWC: Characteristics of establishment, management, and regional factors. 3) Research for the physical environment aspects of MHWC: Classification and evaluation of MHWC's Type by locational characteristics in Japan. Results : The result of this study can be summarized into three points. The first one, Mental Health and Welfare Center's service has being expanded to suicide, depression and stress from chronic mental illness, to reflect social needs. The second one, The average population of area installed at Mental Health and Welfare Center was 2,307,570 person, and average area of the regions were $5,745m^2$. The third one, Mental Health and Welfare Center is divided into single-structure type and combine-structure type. And combine-structure type is divided into medical-combine type, welfare-combine type, and public-combine type.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 추계학술대회
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• pp.484-488
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• 1997

Three-dimensional finite element analyses were used to compare the stress distribution and the stability of the fixation among seven different tibial components and to investigate the effect due to implant materials in total knee arthroplasty. The components included an intact tibia(Type I), Cemented Cobalt-Chromium tibial tray implanted with a PMMA cemented Co-Cr stem(Type II), Cemented Co-Cr tibial tray with a uncemented Co-Cr stem(Type III), Cemented Ultra High Molecular Weight Polyethylene (UHMWPE) tibial tray with a cemented UHMWPE stem (Type IV), Cemented UHMWPE tray with a uncemented UHMWPE stem(Type V), Cemented Co-Cr tray without a stem(Type VI), and Cemented UHMWPE tray without a stem(Type VII). Uncemented components were assumed to have complete bony in growth and a rigid state of fixation between component and bone. The interface between bone/cement/component of cemented components was also assumed to be fully bonded. Bi-condylar forces were applied. The results indicated that Uncemented stem components provided lower bone stress shielding and stress concentration. The UHMWPE tray and stem component showed better agreement with the intact tibia than the Co-Cr Alloy tray and stem components. If the implant tray can be fixed firmed without a stem, Cemented PE tray without a stem(Type VII) may be recommended to give the best characteristics in the sense of stress distribution and stability.

• Design & Manufacturing
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• 제17권2호
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• pp.22-26
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• 2023

As Light-Emitting Diodes(LEDs) continue to advance in performance, their application in automotive lamps is increasing. Automotive LEDs utilize light guides not only for aesthetics but also to control light quantity and direction. Light guides employ patterns of a few hundred micrometers(㎛) to regulate the light, and the surface roughness(Ra) of these patterns can reach tens of nanometers(nm). Given that these light guides are produced through injection molding, mold processing technology with high surface quality micro-patterns is required. This study serves as a preliminary investigation into the development of high surface quality micro-pattern processing technology. It examines the surface roughness of the workpiece based on the cutting direction of the pattern and the cutting fluid type when cutting micro-patterns on STAVAX steel using cubic Boron Nitride(cBN) tools. The experiments involved machining a step-shaped micro-pattern with a height of 60 ㎛ and a pitch of 400 ㎛ in a 22×22 mm area under identical cutting conditions, with only the cutting direction and cutting fluid type being varied. The machining results of four cases were compared, encompassing two cases of cutting direction(parallel to the pattern, orthogonal to the pattern) and two cases of cutting fluid type (flood, mist). Consequently, the Ra value was found to be the highest(Ra 128.33 nm) when machining with the flood type in parallel to the pattern, while it was the lowest(Ra 95.22 nm) when machining with the mist type orthogonal to the pattern. These findings confirm that there is a difference of up to 25.8 % in the Ra value depending on the cutting direction and cutting fluid type.

• 한국노년학
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• 제31권3호
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• pp.489-503
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• 2011

본 연구는 노인을 대상으로 하는 성매매 여성, 속칭 '박카스 아줌마'에 관한 질적 연구이다. 연구의 목적은 박카스 아줌마들의 실태를 파악하고 이들을 위한 상담적 대안을 살피는 것이다. 이를 위하여 중도에 연구철회를 요청한 5명을 제외한 53세~71세 사이의 여성 총 10명이 연구에 참여하였다. 이들에 대한 심층면접 결과 이들의 성매매와 관련한 유형으로 유입-생계형, 재유입-생계형, 재유입-유희형, 재유입-강제형이 나타났다. 노인을 대상으로 하는 성매매 여성들을 위한 상담 과정은 노인상담의 특성과 성매매 여성들의 PTSD 양상을 고려해야하며, 사회적 연결망을 통한 복지지원과, 성교육 및 보건 의료적 조치가 필요하다. 나아가 독특한 현상으로 나타난 박카스 아줌마에 대한 연구인력 확보와 상담전문가 및 성교육자 양성을 통해 노인복지 향상을 위한 구체적 노력이 요구된다.

• Bulletin of the Korean Chemical Society
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• 제32권4호
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• pp.1368-1370
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• 2011

• 한국통신학회:학술대회논문집
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• 한국통신학회 2006년도 하계종합학술발표회 논문 초록집
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• pp.491-491
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• 2006

• 대한약학회:학술대회논문집
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• 대한약학회 2000년도 춘계총회 및 학술대회
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• pp.145.3-146
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• 2000