• 한국건설순환자원학회논문집
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• 제6권2호
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• pp.100-107
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• 2018

초고강도 섬유보강 콘크리트 50M 합성 박스거더에 대한 재료적 비선형 및 기하학적 비선형 유한요소해석이 수행되었다. 인장과 압축구역에서 구성방정식을 실험에 근거하여 모델링하였다. 비선형 유한요소해석의 정확성은 UHPFRC 50M 합성거더의 실험 결과와 비교하여 검증하였다. 1.5% 체적대비 섬유혼입률, 135MPa 압축강도 및 18MPa 휨인장강도 특성을 가진 UHPFRC 50M 합성거더에 대한 휨실험이 수행되었다. 포스트텐션힘으로 결합된 UHPFRC 합성거더는 3개의 UHPFRC 분절 U거더와 고강도 철근콘크리트 슬래브로 구성되었다. Midas FEA를 사용하여 UHPFRC 거더 부분은 8개 절점을 가진 3차원 6면체 모델링을 하였고, 철근와 강연선은 2개 절점을 가진 선형 요소로 모델링하였다. Total strain crack 모델에 기반을 둔 압축 및 인장 다중 선형모델을 사용하여 구성방정식을 설정하였고 균열은 smeared crack model로 구성하였다. 철근과 강연선의 비선형성은 Von Mises 규준을 적용하였다. 비선형 정적해석은 Newton-Rhapson 기법의 수렴치를 사용한 점진적 반복기법을 사용하여 해를 수행하였다. 유한요소해석은 하중-변위관계, 중립축 변화관계 및 균열양상에 대하여 실험 결과와 수치 해석 결과를 비교하여 검증하였다. 하중-변위 관계는 실험 결과와 비교해볼 때 매우 정확한 결과를 보여주고 있다. 본 논문에서 수행한 비선형 유한요소해석법은 철근보강 포스트텐션닝 초고강도 섬유보강 합성 박스거더의 휨거동 해석에 만족한 결과를 보여주고 있다.

• 한국건설관리학회논문집
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• 제6권3호
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• pp.144-155
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• 2005

1950년대 이후 주택수요의 급격한 증가와 낮은 주택투자로 인한 만성적 주택부족 사태는 정부 주도의 주택공급정책에 의존해 오고 있다. 주택시장이 수요와 공급에 의한 자율적 가격결정구조를 가지지 못하고 정부 정책에 따라 인위적으로 움직임으로써 주택가격은 폭등과 폭락을 반복하고, 아파트 미분양 등에 의한 건설사의 수익성 악화나 중소건설업체의 부도와 같은 문제점들이 발생하고 있다. 이는 건설기업이 주택시장의 구조적 문제점을 파악하고 정부의 정책에 시기 적절히 대처하지 못함으로써 주택시장적응력을 상실한 결과라 할 수 있다. 또한 정부도 주택시장의 가격에 의존한 단기적 정책 효과만을 의존함으로써 주택시장의 가격결정시스템을 약화시키는 결과를 초래한 것이다. 즉, 주택시장의 동태적 환경시스템이라는 숱을 보지 못하고 정부 정책에 의한 단기적 영향요인이라는 나무만을 봄으로써 나타난 결과라 할 수 있다. 따라서 본 연구는 주택 시장을 주택수요 영향변수와 주택공급 영향변수 그리고 그에 영향을 미치는 거시 환경적 영향변수들을 분류하고, 이들 간의 상호작용을 시스템 사고와 전통적 소비자 선택이론에 입각하여 연결함으로써 이에 의해 구성되는 인과순환구조를 구축하도록 한다. 이를 통해 주택시장이 가지는 동태성의 장기적인 형태를 피드백 루프의 존재를 통해 확인해 줌으로써 주택시장의 역동적 변화 원인을 규명하고자 한다.

• Journal of Forest and Environmental Science
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• 제29권1호
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• pp.15-28
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• 2013

Protected area based ecotourism is now the most interesting topic to the nature lover and policy maker throughout the world because of its linkage with economic benefits, protected area management and biodiversity conservation. Based on this premise our study explores the visitors' perception on the recreational potential of Kaptai National park and its potentiality in ecotourism development in Bangladesh. The field survey was carried out both in holidays and non-holidays of the week from the late winter season in 2009 to the spring season in 2010. A total of 118 visitors were interviewed with the help of a semi-structured questionnaire. Study findings revealed that about 62% male constitute the visitors group with the maximum number of visitors in the age of between 15-25 years (35.59%). The tourists were very much attracted by boat riding (93.22%) followed by scenic beauty of Rampahar-Sitapahar (85.59%). A major portion of about 57.14% tourists wished to visit the park within a year because they got a lot of pleasure from Natural and green environment (86.44%) followed by boating on Kaptai Lake (85.59%). Most of the visitors (36%) were happy about existing facilities but defined some problems such as tour guiding facility, food and drinking water supply, etc. About 71% and 66% respondents perceived that Kaptai National Park made them to be concerned and protective of nature and supports and sustains local ecosystem respectively and 43% respondents agreed that Kaptai National Park ensures the social equity and involve local people in ecotourism which are the most important elements of sustainable ecotourism. The present study results also predict that the park might be a good recreational area for enjoying with family members and group of friends through proper management and promoting the relationships among tourism, local people and biodiversity conservation.

• 한국의류산업학회지
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• 제17권5호
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• pp.718-730
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• 2015

This study investigated the correlation between the level of consistency in fashion show models' appearance and design concept through a statistical and qualitative analysis of the S/S Paris Collection 2014. The following conclusions have been drawn in this study. First, the percentage of models of color was very low in regards to the physical appearance of models; in addition, there was a higher percentage of Caucasian models for collections with a high level of consistency in models' physical appearance. Collections with a high percentage of models of color indicate more casual design concepts and the promotion of diversity in racial background is considered more effective for street fashion. Second, collections with a high level of consistency in models' physical appearance tend to control various elements that constitute a physical appearance through more detailed planning and stage direction. Third, there is a tendency to reinforce design concepts by creating a consistency in the overall physical appearance of models. This affirms that their physical appearance is determined by brand (i.e. designer) and is used to maximize a design concept delivery. The results of this study suggests that the physical appearance of models must be determined in line with the design concept versus detailed planning that must consider audience perspectives as well as adjust the show's length and the interval between each model appearing on the stage.

• 한국해양공학회지
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• 제21권2호
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• pp.22-34
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• 2007

We present basic data for developing new research topics and closely examine the existing data on the development and organization of the Nakdong River Estuary Delta by analyzing various studies of the area, including ocean engineering, coastal engineering, ocean environmental engineering, geomorphological, and geological studies. We first defined the general concepts related to the estuary and delta and reviewed the historical development of the Nakdong River Estuary Delta over the past 100 years. We then examined the origin and core elements of the estuary deposits that constitute the delta. In addition, we scrutinized the main factors affecting the development of the delta and analyzed existing research on delta development mechanisms by core researchers. The construction of an estuary barrage is one of the main factors effecting estuarine circulation and has altered the physical oceanic environment, area of deposition, atmospheric environment, and vegetation community of the delta. These factors affect the estuary circulation in turn, altering the delta. Along the Nakdong River, an unsteady-state sandy barrier appears at approximately three times the distance of the wavelength of incident offshore waves, and this terrain forms approximately 10-15 years after reclamation in the interdistributary upper stream and transforms the shoreline. It is necessary to develop a technique to predict terrain change that reproduces the erosion and accumulation of estuarine deposits. To determine the parameters and variables necessary to reproduce this system, continuous on-site monitoring is necessary. The existing research did not fully examine the terrain changes in Nakdong River Estuary or the periodic developmental characteristics. To understand the future process of estuary delta development, it is necessary to establish an integrated management system.

• Journal of Oral Medicine and Pain
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• 제23권2호
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• pp.193-209
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• 1998

In identifying bodies that are severely decayed or damaged, methods using fingerprints and various biochemical tests are known to have its limits. To overcome this, forensic odontological method which is based on the analysis of the cranium, tooth and dental restoration is used to enhance the accuracey of individual identification. For this reason, I have come to analysis of the dental materials that exists between the teeth that is perceived to have been previously restored and the one adjacent to it. By analyzing the constituents of gold crown-restored, non-precious metal-restored, gold inlay-restored and amalgam -restored teeth, and adjacent teeth using EDX(energy dispersive X-ray microanalysis) which was invented to analyze very small amount of elements, the nature of the restoration could be predicted and the results obtained were as follows. 1. Some of constitute of gold alloy was extracted from residual cement of gold crown restoration, but that was not extracted from the restored tooth and the one adjacent to it. 2. Some of constituents of non-precious metal alloy was extracted both in the residual cement on the tooth with no-precious metal restoration and in the tooth with the restoration itself. However, none of its constituents were found in the tooth adjacent to it. 3. Some of constituents of gold alloy were found in the residual cement of gold inlay, but they were not found in the restored tooth and the adjacent tooth. 4. Some of constituents of amalgam alloy were found both in tooth restored with amalgam and in the adjacent tooth. From the results obtained above, it is possible to utilize the data obtained from analyizing residual dental materials in a more effective way. This data compensates for the lost data due to any harm done to the restorations prior to individual identification and further enhances the accuracy. Therefore, it could be concluded that this process of analyzing residual dental materials could be beneficial to individual identification in the area of forensic odontoldogy.

• 한국지반공학회지:지반
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• 제1권1호
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• pp.73-84
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• 1985

본 연구에거는 유한요소법에 의해서 제상하중을 받고 있는 연약지반의 응력분포와 변위를 규명하 였다. 응력에는 체적응력, 간극수압, 연직응력, 수평응력, 전단응력이 포함된다. 유한요소기법으로서 Christian-Boehmer방법을 택하였으며 진배수 및 비배수조건에서 일반탄성model과 참정 Cam-clay model을 지배방정으로 선정하였다. 그 결과는 다음과 같다. 1. 체적응력은 간극수압과 거의 일치한다. 이는 비배수조건에서 전응력이 간극수탄과 같다는 것 을 의미한다. 2. 연직응력은 배수 및 비배수표건이라 구성식의 model에 관계없이 같은 갈을 나타런다. 3. 수평응력은 배수조건과는 무관하지만 구함식의 model에 따라서 다른 값으로 나타난다. 4. 전단응력은 배수조건 및 구성식의 model model에 따라 다른 값이 된다. 수정 Cam-clay에 의한 해석치가 가장 크게 된다. 5. 변위 Vector의 방향은 하중이 증가하는 동안 성토법면근방에서 외향으로 향한다. 6. 변위의 크기는 수정 Cam-clay에 의한 해석이 탄성 model의 2배가 된다.

• 한국언론정보학보
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• 제39권
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• pp.324-354
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• 2007

공공의 영역에 속하는 뉴스의 사실 자체는 공기처럼 자유로운 것이지만, 이것이 노동과 자본의 투자로 뉴스로 전환되었을 때, 상업성이 인정되는 재산권적 가치를 갖게 되며, 이를 생산한 언론사는 배타적 권리를 갖게 된다. 상품으로서 뉴스는 재산인 것이다. 재판부도 이러한 취지에 부합하게 사실보도에 대한 저작권 보호의 범위를 넓게 인식할 필요가 있다. 법으로 보호되는 것은 표현의 방법, 사건에 대한 기자의 분석과 해석, 문장의 구성과 자료의 배열, 단어의 선택, 특정한 부분에 주어진 강조 등이다. 즉, 침해의 핵심은 일반적인 주제나 사건 보도에 있는 것이 아닌 취급의 유사성이나 표현 방법의 착취에 있다. 보도기사가 사실적 요소들을 열거하여 정보를 전달하고 있지만, 소재의 선택과 문장 속에서의 용어의 배열, 강조 등은 학문이나 예술과 같은 고도의 창작성을 갖는 것은 아니지만, 낮은 정도의 창작활동에 속하는 것이다. 따라서 보도기사를 단순한 사실의 전달에 머물러 창작성이 결여되었다고 판단하는 것은 저작권법 원래 취지와도 배치되는 것이다.

• Journal of Periodontal and Implant Science
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• 제44권5호
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• pp.227-234
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• 2014

Purpose: Dentin hypersensitivity is a potential threat to oral health. Laser irradiation may provide reliable and reproducible treatment but remains controversial. The present study aimed to evaluate the effects of $CO_2$ or erbium-doped yttrium aluminium garnet (Er:YAG) laser therapy, and to assess mineral content. Methods: Eighteen human single-rooted teeth affected with advanced periodontitis were obtained. Buccal and lingual surfaces were planed to form 36 specimens. Ethylenediaminetetraacetic acid gel (24%) was applied to remove the smear layer and simulate hypersensitive teeth. The experimental groups were: group 1, control (no irradiation); group 2, $CO_2$ laser (repetitive pulsed mode, 2 W, $2.7J/cm^2$); and group 3, Er:YAG laser (slight contact mode, 40 mJ/pulse and 10 Hz). To evaluate dentinal tubule occlusion, six specimens per group (2-mm thickness) were prepared and observed using scanning electron microscopy (SEM) for calculation of the occlusion percentage. To evaluate the mineral content, six specimens per group (0.6-mm thickness) were used, and then the levels of Ca, K, Mg, Na, and P were measured by inductively coupled plasma-atomic emission spectrometry. In addition, the surface temperature of the specimens during laser irradiation was analyzed by a thermograph. Results: The SEM photomicrographs indicated melted areas around exposed dentinal tubules and a significantly greater percentage of tubular occlusion in the $CO_2$ and Er:YAG laser groups than the control, and in the Er:YAG group than the $CO_2$ laser group. In addition, no significant differences were noted among the experimental groups for the mineral elements analyzed. The $CO_2$ laser group showed an evident thermal effect compared to the Er:YAG group. Conclusions: $CO_2$ and Er:YAG laser are effective in treating dentin hypersensitivity and reducing its symptoms. However, the Er:YAG laser has a more significant effect; thus, it may constitute a useful conditioning item. Furthermore, neither $CO_2$ nor Er:YAG lasers affected the compositional structure of the mineral content.

• 복식
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• 제54권7호
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• pp.55-62
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• 2004

Research into the ancient dyeing and weaving culture is of critical importance to the fact that they constitute an integral part of the Korean costume. Due to the absence of the originals reflecting ancient costume cultures, it is difficult to figure out what the dyeing and weaving culture was like in ancient times. Because of limited visual materials available from the wall paintings of ancient tombs, studies conducted so far concerning the costume culture for the Goguryeo have focused on visual elements such as shape, structure, and type. As a result, research into ancient Korean dyeing and weaving cultures hasn't been properly made. Thanks to the presence of both some dyeing fabric originals from Goguryeo's neighboring countries and some visual materials like the wall paintings of the Goguryeo, it may be possible to obtain some clues to the dyeing and weaving culture. The dotted Pattern costumes were selected such as Muyongchong, No. 1 Jangcheon Tomb, Gakjeochong, Samsilchong, Ssangyeongchong, Susanri Tomb. According to a book titled ‘Hanwon’, the Goguryeo people manufactured fabrics in such a way that resist-dyed spots produced elaborate patterns over the purple fabric. It can be safely said that such dot patterns were produced by means of dyeing rather than weaving, because identical patterns aren’t well produced by means of painting and embroidery. Considering Goguryeo’s natural features, the dot patterns mentioned in historical literatures are thought to have been produced using animal’s skin. However, there is highest possibility that the dot Patterns were Produced using tie-resist dyeing or wax-resist dyeing techniques. With respect to the dyeing and weaving culture for the Goguryeo, one must refer to neighboring countries’ dyeing and weaving environments, given that the Goguryeo had engaged substantial cultural exchanges with China.