• 자원환경지질
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• 제57권4호
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• pp.363-370
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• 2024

금왕단층의 지구조적인 운동과 풍암분지 발달의 연관성을 분석하기 위해 지상측정 중력장 및 항공측정 자기장 분포를 해석하였다. 금왕단층 일원의 낮은 중력이상대는 비대칭적인 분포를 보이며 단층의 좌측부가 남동쪽으로 이동한 좌수향 주향이동을 지시한다. 관측된 중력이상도에서 측정한 이동 변위는 약 9.3 km 정도이다. 항공 자기장 분포는 중력장 해석에서 나타난 약 9.3 km 정도의 수평 변위를 지지하는 매우 뚜렷한 자기장 특징을 보인다. 오일러 디콘볼루션(Euler deconvolution) 방식으로 계산한 금왕단층의 평균 깊이는 약 1,000 m이며, 풍암분지 남서쪽이 북동쪽과 비교하면 약 700 m 정도 더 깊을 것으로 판단된다. 이는 금왕단층이 주향이동뿐 아니라 경사 방향으로 움직였다는 것을 강력하게 시사하며, 이와 같은 단층의 변위는 힌지단층의 특징을 나타내며 단층경계함몰(fault margin sag)에 의한 분지 형성에 기여한 것으로 판단된다.

• 한국구조물진단유지관리공학회 논문집
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• 제19권1호
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• pp.128-138
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• 2015

탄산화는 지하구조물과 같이 이산화탄소의 농도가 높고 강우로부터 보호되는 콘크리트 구조물에 매우 심각한 열화현상이다. 탄산화 깊이 및 수화물의 변화를 평가하기 위해 많은 연구가 진행되고 있으나 해석모델의 복잡성, 이산화탄소 확산계수 모델링 등의 어려움으로 인해 실제 탄산화 거동을 제한적으로 모사하고 있다. 본 연구에서는 기존의 탄산화 모델링 (Ducom)에 대하여 확산계수 모델링, 공극률 감소 모델, 이산화탄소의 장기반응률 등을 개선하여 개선된 탄산화 모델을 제시하였다. 검증을 위하여 온도변화를 고려한 촉진탄산화 시험. 공극률 평가 시험 (수은압입법)을 수행하였으며, 탄산화 깊이를 개선되기 전/후의 모델과 비교하였다. 또한 수산화칼슘의 중량변화와 실태조사결과를 이용하여 낮은 이산화탄소에 노출된 콘크리트 구조물의 탄산화 깊이를 제안된 모델과 비교하였다. 제안된 모델은 확산계수 감소성, 공극률 감소성을 적절하게 반영하여 기존의 모델에 비해 합리적인 결과 (수산화칼슘 소모량, 탄산화 깊이)를 나타내었다.

• Journal of Periodontal and Implant Science
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• 제30권1호
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• pp.111-120
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• 2000

Purpose We designed this study for the purpose of determining the relationship between periodontal disease activity and PLBW, using the evaluation of probing pocket depth, loss of attachment, gingival index, gingival crevicular fluid amount and subgingival microflora. Methods A total of 100 volunteer mothers(mean age 30.44) at the Department of Obstetrics and Gynecology Seoul National University Hospital were selected for this study.Pregnancy outcomes were categorized into cases and controls in two ways. our definition was based on the following; Group 1 : Any PLBW cases Vs. All NBW controls Group 2 : PLBW cases Vs. NBW controls A periodontal exam was performed on the Ramfjord( #16, 21, 24, 36, 41, 44) teeth and Clinical evaluation consisted of probing pocket depth, loss of attachment, gingival index and gingival crevicular fluid amount. Subgingival plaque samples were collected by three sterile #35 paper points. The total number of anaerobic colonies and aerobic bacteria were enumerated after incubation. Antisera to P. gingivalis, P. intermedia, A. actinomycetemcomitans were produced in white rabbits with live whole cells suspensions. The specific fluorescent bacteria obtained by immunofluorescence and total cell counts obtained by dark-field microscopy were counted on four fields. The percent of each specific microorganism in the total cell count was determined. Results Any PLBW and PLBW cases showed significantly greater probing depth and attachment loss than all NBW and NBW controls. Cases group had significantly increased anaerobic bacterial counts compared with control group and no differences in the other microbes. This study confirmed that periodontal disease is a statistically significant risk factor for PLBW by investigating clinical parameters and subgingival plaque analysis.

• 한국도로학회논문집
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• 제20권3호
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• pp.19-26
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• 2018

PURPOSES : The main purpose of this study is suggest of field bond strength evaluation method for more objective evaluation method through Evaluation of Bond Strength Properties with changing aspect ratio and temperature. METHODS : The evaluation is laboratory bond strength test. Using the core machine, the pull-off test method ; the bond strength test of interface layer the universal testing machine. RESULTS : As a result of the laboratory bond strength evaluation, it was verified that the bond strength by aspect ratio decreases linearly with increasing aspect ratio and the bond strength properties by temperature change existed at high and low temperature condition relative to odinary temperature condition. CONCLUSIONS : According to the results of laboratory bond strength evaluation, the field bond strength evaluation results suggest applying the proposed correction factor (0.8, 1.0, 1.4, 1.9) according to aspect ratio(0.5, 0.1, 1.5, 2.0), For more objective evaluation of the bond strength, it is analyzed that the evaluation value is within $6{\sim}32^{\circ}C$ and the result can be obtained within 5% of the coefficient of variation.

• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2000년도 High Temperature Superconductivity Vol.X
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• pp.155-159
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• 2000

YBCO step-edge dc SQUID magnetometers on sapphire substrates have been fabricated. CeO2 buffer layer and YBCO films were deposited in situ on the low angle (${\sim}$35$^{\circ}$) steps formed on the sapphire substrates. Typical 5-${\mu}$m-wide junction has R$_n$ of 5 ${\omega}$ and I$_c$ of 50 ${\mu}$A with large I$_c$R$_n$ product of 250 ${\mu}$V at 77K. According to applied bias current, depth of voltage modulation was changed and maximum voltage was measured 16 ${\mu}$V. Field noise of do SQUID was measured 100${\sim}$300 fT/${\surd}^{Hz}$ in the 1 $^{kHz}$, and about 1.5 pT/${\surd}^{Hz}$ in the 1/f region. For ac bias reversal method, field noise was decreased in the 1/f region. The QRS peak of magnetocardiogram was measured 50 pT in the magnetically shielded room.

• 한국농공학회논문집
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• 제52권5호
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• pp.77-86
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• 2010

Hydrologic Simulation Program-Fortran (HSPF) coupled with PEST which is optimization program was calibrated and validated at Bochung watershed by using monitoring data of water quantities and nutrient loading. Although the calibrated data were limited, model parameters of each land use type were optimized and coefficient of determinations were ranged from 0.94 to 0.99 for runoff, from 0.89 to 1.00 for TN loading, and from 0.92 to 1.00 for TP loading. The optimized hydrological parameters indicated that the forested land could retain rainfall within soil layer with high soil layer depth and infiltration rate compared with other land use type. Hydrological characteristics of paddy rice field are low infiltration rate and coefficient of roughness. The calibrated parameters related to nutrient loading indicated generation of nutrient pollution from agricultural area including upland and paddy rice field higher than other land use type resulting from fertilizer application. Overall PEST program is useful tool to calibrate HSPF automatically without consuming time and efforts.

• Journal of the korean society of oceanography
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• 제34권2호
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• pp.73-85
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• 1999

When typhoons passed around the Korea Strait, some observation in this strait carried out by Mizuno et al. (1986) gives us the following oceanographic features; 1) the direction of the observed current was opposite to the northeasterly wind, 2) temperature rapidly increased having a time lag as the depth deepens, after then decreased with oscillation. A primitive equation ocean model that makes use of a sigma-coordinate system and incorporates a typhoon model was used to examine the mechanism to generate these phenomena. The model region covers the East China Sea, the Yellow Sea, and a portion of the East Sea (Japan Sea). The model well reproduces the observed features, especially in temperature field, and clearly manifests how the above observed features happened. From early time when the typhoon was located in low latitude, an alongshore northward current in the west of Kyushu (hereafter the West Kyushu Current) is generated by an alongshore wind in the typhoon. This current flows into the eastern channel, as a coastal jet, regardless to the wind field within the Korea Strait during this period. The above observed phenomena are generated by this current. The model results indicate that when typhoons pass around the Korea Strait, the West Kyushu Current is generated, and oceanographic condition in the strait should be greatly influenced by this current.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2010년도 제34회 춘계학술대회논문집
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• pp.165-169
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• 2010

케로신과 액체산소를 사용하는 액체로켓엔진은 극저온 영역과 고온의 연소가스 영역이 공존하게 된다. 전기부품을 포함한 엔진의 각 부품의 원활한 작동을 위해서는 단열재가 적절하게 엔진에 적용되어야 한다. 본 연구에서는 이러한 액체로켓엔진의 단열재 적용방안에 대해 세단계로 나누어 고찰하였다. 첫 번째로 고온및 극저온 부품을 정의하고 영역의 온도장을 해석하는 것이다. 두 번째는 각 부품 간을 연결해주는 배관 등의 연결부품에 대한 열전달 해석을 수행한다. 세 번째로 이러한 열전달 해석을 근거로 단열기준을 설정하여 적절한 온도분포가 형성되도록 단열재를 선정하고 적용하는 것이다. 본 논문에서는 이러한 적용방안에 대한 해외사례를 고찰하고 각 단계별로 단열재 적용방안을 마련해 본다.

• 한국환경복원기술학회지
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• 제17권5호
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• pp.51-64
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• 2014

Most planting grounds have converted to the artificial ground of the upper part of underground parking lot in apartment complex recently by increasing utilization of underground parking area. This study has examined the composition of each ground and planting status. The study presents problems of planting plans in artificial ground landscaping in apartment complex. This study has conducted reference and field research. It has researched green space planning, planting characteristics and measures condition of soil depth in 3 regions surveyed. The results are listed below. First, hybrid ground has the highest percentage and natural soils has the lowest percentage in the composition of green space in apartment complex. Artificial green space is composed of a number of small-scale grounds. Second, The study has found that planting characteristics don't reflect soil properties. On the other hand, planting deep rooting big arbors has a high proportion in artificial Ground. Third, the study has figured out 98% of fit in minimum soil depth for growth. Fourth, planters and landscaping stones are constructed in case of small green space. On the other hand, mounding is constructed in case of large green space. However in case of mounding types it has low fit, so it needs to improve this problem.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권5호
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• pp.2363-2374
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• 2016

Communication occurs through verbal elements, which usually involve language, as well as non-verbal elements such as facial expressions, eye contact, and gestures. In particular, among these non-verbal elements, gestures are symbolic representations of physical, vocal, and emotional behaviors. This means that gestures can be signals toward a target or expressions of internal psychological processes, rather than simply movements of the body or hands. Moreover, gestures with such properties have been the focus of much research for a new interface in the NUI/NUX field. In this paper, we propose a method for recognizing the number of fingers and detecting the hand region based on the depth information and geometric features of the hand for application to an NUI/NUX. The hand region is detected by using depth information provided by the Kinect system, and the number of fingers is identified by comparing the distance between the contour and the center of the hand region. The contour is detected using the Suzuki85 algorithm, and the number of fingers is calculated by detecting the finger tips in a location at the maximum distance to compare the distances between three consecutive dots in the contour and the center point of the hand. The average recognition rate for the number of fingers is 98.6%, and the execution time is 0.065 ms for the algorithm used in the proposed method. Although this method is fast and its complexity is low, it shows a higher recognition rate and faster recognition speed than other methods. As an application example of the proposed method, this paper explains a Secret Door that recognizes a password by recognizing the number of fingers held up by a user.