• 한국터널지하공간학회 논문집
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• 제8권1호
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• pp.53-63
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• 2006

본 연구는 프라우드 상사와 등온기체모델을 적용한 축소모형실험을 실시하여, 터널화재시 연기의 거동과 부분배연설비의 배연효율을 분석함으로써 방재설비의 운영방안을 제시하고자 하였다. 실험 결과 터널 화재시 입계유속 이상의 제연 풍량이 유지 될 경우 부분 배연 갤러리의 배연효율은 그룹댐퍼와 균일댐퍼 모두 거의 유사하였다. 또한, 터널내 차량이 정체시 화재가 발생할 경우, 화재초기에는 화원 앞 뒤에 위치해있는 부분 배연 갤러리만을 열어 연키의 성총회률유지하면서 연층을 배연시키고 제트팬은 가동시키지 않고 이후 승객이 모두 대피할 수 있는 충분한 시간이 지난 후 제트팬을 함께 가동시켜 터널 내의 연기를 배출하도록 하며 교통 소통이 원활한 경우에는 터널의 제연설비를 가몽하여 연기의 후방전파를 차단하고 통시에 부분배연 설비를 가동할 것을 제안하였다.

• 한국터널지하공간학회 논문집
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• 제17권4호
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• pp.487-497
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• 2015

도심지 교통량의 증가로 터널구간의 정체현상을 해결하기 위해 기존의 터널을 활용하여 증축 혹은 개축하는 단면 확대공사가 최적의 대안으로 고려되고 있다. 기존의 단면 확대기술은 교통흐름을 차단하고 시공하나, 최근 프로텍터를 활용하여 교통흐름을 유지할 수 있는 교통류 보존형 터널 단면 확대기술이 개발되었다. 이 기술은 교통흐름을 보존하여 수많은 사회적 손실을 최소화 할 수 있으나, 교통흐름을 보존하기 위한 프로텍터의 설치 및 운영으로 경제성 측면에서 불리할 수밖에 없다. 이러한 단면 확대기술들의 경제성을 적절히 평가하기 위해서는 시공중 교통흐름을 고려한 사회적 손실비용을 고려할 필요가 있다. 따라서 본 연구에서는 터널단면 확대 시공기술의 교통흐름을 고려한 사회적 손실비용을 산정하는 방법을 제시하는 것을 목표로 하였다. 그리고 매봉터널을 대상으로 사례연구를 수행하여 교통흐름에 따른 사회적 손실비용의 차이를 분석하는 것을 목표로 하였다.

• 수산해양교육연구
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• 제28권1호
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• pp.221-234
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• 2016

Open port has the designated course and traffic jam of ships happens often. This fact may connect to ship crash easily. And the accident happens due to violation of navigation mainly. In ship crash between Neoblue and Shinkwang 7 at incheon open port, the Korean incheon maritime safety tribunal shows that the violation of navigation and duty of attention at the open port would produce ship crash directly. Wherefore, the interpretation and application of navigation are important to protect future ship crash accident. The points of navigation as objects of study are divided into two categories, interpretation and application of navigation on crashing between the ship which navigate the designated course and the ship which enter into the designated course from the another course or outside the course, interpretation and application of navigation on crashing between two or more ships, which navigate violating the navigation every ships and violating agreement rule each other. And as conclusion, I refer the legal responsibility both Neoblue and Shinkwang 7 in detail. The results of this study as follows : First, in case of crashing between the ship which navigate the designated course and the ship which enter into the designated course from the another course or outside the course, public order in open port act can be applied by priority. However, in applying the public order the principle of trust and reasons of crew, cause and effect, the time of navigation application are mandatory considerations. Second, in case of crashing between two or more ships, which navigate violating the navigation every ships and violating agreement rule each other, we should focus on the reasons of crew. Also, the reasons of crew need strict conditions. These means that the awareness of crash danger and recognition of special circumstance including limit state of ships, existence of emergency danger, non escaping crash danger by only observance of navigation. And in case of this state the public order the principle of trust and reasons of crew, cause and effect, the time of navigation application should be considered by priority, too.

• 융합정보논문지
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• 제10권6호
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• pp.14-18
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• 2020

본 논문은 2세트의 크로스 아이 재머 안테나가 십자형으로 배치되어 모노펄스 레이다를 재밍하는 경우 재머의 위상차와 진폭 비 및 레이다 조우각도에 따른 재밍 효과를 분석하였다. 크로스 아이 재머의 위상차와 진폭비는 재머에서 조정이 가능하지만 조우각도는 레이다에 의해서 상대적으로 결정되기 때문에 조우각도 변화에 따른 재머의 대응이 매우 중요하다. 수직 교차된 2세트의 크로스 아이 재머 안테나는 하드웨어 구성을 최소로 하면서 재밍 효과를 높일 수 있는 좋은 방법으로 판단되며, 조우각도를 0°~360° 변화시키면서 재밍 효과를 분석하였다. 본 재머는 단일 재머와 비교하여 조우각도 45°~135°와 225°~315°에서 재밍 효과가 크게 향상되며, 항공기 및 함정의 크로스 아이 재머 설계에 유용하게 활용될 것으로 판단된다.

• 한국재난관리표준학회지
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• 제2권4호
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• pp.49-57
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• 2009

대구경 강관을 이용한 지하구조물 공사방법은 교통지연 및 안전사고 가능성이 높은 지하시설물 공사에 대해서 지상 교통상황에 영향을 최소화 할 수 있는 비개착 터널공법으로 시공단계별 구조적 안전성 확보가 중요하다. 본 연구에서는 상용구조해석 프로그램인 ANSYS를 이용하여 공법의 주요 부재인 대구경 강관의 관경별 구조적 거통특성을 분석하였다. 또한, 위험시공단계를 선정하고 위험시공단계에서의 웅력집중부위의 응력상태를 검토하였다. 마지막으로 관경 및 관 두께에 따른 구조물의 거동과 응력상태 변화를 확인하여 효율적인 대구경 강관의 사용을 제안하였다.

• 한국도로학회논문집
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• 제14권5호
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• pp.31-45
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• 2012

PURPOSES: In Korea, rapid maintenance of distressed concrete pavement is required to prevent traffic jam of the highway. Asphalt concrete overlay has been used as a general maintenance method of construction for aged concrete pavement. AC overlay on existing concrete pavements experience various early distresses such as reflection crack, pothole and rutting, due to different physical characteristics between asphalt overlay and existing concrete pavement. Bonded concrete overlay(BCO) is a good alternative since it has advantages that can reduce various distresses during the service life since overlay material has similar properties with existing concrete pavements. Recently, BCO which uses the ultra rapid harding cement has been applied for maintenance of highway. BCO has advantage of structural performance since it does monolithic behave with existing pavement. Therefore, it is important to have a suitable bond strength criteria for securing performance of BCO. Bond strength criteria should be larger than normal tensile stress and horizontal shear stress occurred by traffic and environmental loading at bond interface. Normal tensile stress and horizontal shear stress need to estimated for the establishment of practical bond strength criteria. METHODS: This study aimed to estimate the bond stresses at the interface of BCO using the three dimensional finite element analysis. RESULTS: As a result of this study, major failure mode and maximum bond stress are evaluated through the analysis of normal tensile stress and horizontal shear stress for various traffic and environmental load conditions. CONCLUSIONS: It was known that normal tensile stresses are dominated by environmental loading, and, horizontal shear stresses are dominated by traffic loading. In addition, bond failure occurred by both of normal tensile stresses and horizontal shear stresses; however, normal tensile stresses are predominated over horizontal shear stresses.

• 동의생리병리학회지
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• 제31권3호
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• pp.182-187
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• 2017

The purpose of the present study is a comparison of the antioxidant effects of Angelica gigas Korea (AG), Angelica sinensis of China (AS), and Angelica acutiloba of Japan (AA), and comparison of the effects of AG, AS and AA on tight-junction related genes in human keratinocyte HaCaT cells. All species showed a strong antioxidant effect, and AA was higher than AG and AS in antioxidant effects. The cytotoxicity was confirmed to be higher in AS than AG and AA at a concentration of $1,600{\mu}g/ml$ using the MTS assay in HaCaT cells. We analyzed the effects of AG, AS, and AA on mRNA expression levels of various tight-junction related genes in HaCaT cells. We found that no obvious changes in expression of Claudin 1, 3, 4, 6, 7, 8, Occludin, JAM-A, ZO-1, ZO-2, and tricellulin by treatment of all species, suggesting that there is less possibility of side effects and skin moisturizing effects due to changes in tight-junction gene expression. Our results suggest that AG, AS, and AA are thought to be effective in reducing the oxidative stress of the skin and preventing the aging of the skin.

• 한국운동역학회지
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• 제21권5호
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• pp.511-520
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• 2011

The purpose of this study was to provide scientific information to track and field coaches and athletes through the analyses of the biomechanics characteristics of the top 4 sprinters in the men's 100 m final in the IAAF World Championships Daegu 2011. Twelve video cameras (Sony, Japan) were used to capture the mid portion of the race (40 m - 70 m) with a sampling frequency of 60Hz. Biomechanical variables including the right ankle, knee and hip angles, the trunk angle, and the velocity of center of mass (COM) in the running direction, were calculated with the Kwon 3D program (Visol, Korea). Correlation coefficients between the COM velocity and each variables were calculated using Matlab 2008a (MathWorks, USA) at an alpha level of 0.05. The findings indicated that Yohan Blake (JAM) showed greater range of motion at the ankle and hip. Walter Dix(USA) showed greater knee and trunk movement, and Kim Collins (SKN) showed more dorsi-flexed and extended trunk angles during the race. Finally, Christophe Lemaitre (FRA) showed more plantar-flexed ankle with a less trunk motion, throughout the analyzed race.

• 한국잠사곤충학회지
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• 제38권1호
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• pp.7-12
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• 1996

누에 RAPD-PCR 최적조건에 대해 실험한 결과, 중합효소 연쇄반응(PCR)의 최적조건은 반응액 25$\mu$l에 대해 주형 DNA 30ng, dNTP mixture 200$\mu$M, primer 300mM, Taq DNA Polymerase 1.0unit 및 Mg2+ 1.5mM로 판단되었으며, 또 상기의 실험조건을 기본으로 하여 annealing 온도를 탐색한 결과 35$^{\circ}C$-42$^{\circ}C$에서 DNA의 증폭이 안정적임이 밝혀졌다. 또한 동일한 품종내에서 개체간 및 암수간의 DNA 다형성은 인정되지 않았고, 품종간 DNA 다형성은 OPM 04 primer를 사용한 결과 5개의 RAPD 마커로 인정 되었다. 양친간 다형성이 인정된 primer를 사용하여 F2 33개체에 대해 DNA를 증폭시킨 결과 800 bp band가 3 :1 로 분리되었으므로 누에 품종간 유전적 유연관계 및 유전자 지도작성의 가능성을 제시했다.

• 한국축산식품학회지
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• 제31권3호
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• pp.349-355
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• 2011

Russian deer velvet antlers were divided into three parts and subjected to a extraction process using hot water at 100, 110, and $120^{\circ}C$ or an extraction with 70% ethanol. Each extract was analyzed for its biochemical components, including uronic acid, sulfated-glycosaminoglycans (sulfated-GAGs), and sialic acid, and the antioxidant and anti-acetylcholinesterase activities were investigated. Different levels of uronic acid and sulfated-GAGs were observed in the extracts according to the water temperature used for the extraction, and contents decreased with increasing extraction temperature. The upper layer of each extract showed high amounts of uronic acid and sulfated-GAGs, followed by the middle and base layers. Ethanol extraction was more effective for recovering uronic acid than sulfated-GAGs. Sialic acid content was the highest in the $110^{\circ}C$ extracts but was not observed in the ethanol extracts. Velvet antler extracts showed strong antioxidant activities against DPPH and hydrogen peroxide as well as strong reducing power in a dose-dependent manner. However, the antioxidant activities were different in each layer and according to the extraction method. Additionally, velvet antler extracts exhibited inhibitory activity against acetylcholinesterase, which is associated with Alzheimer's disease, in a dose-dependent manner. These results suggest that velvet antler extracts are useful as a functional food ingredient and/or a pharmaceutical.