• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.90-96
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• 2008

Engineered mixtures composed of rigid sand particles and soft rubber particles are tested to investigate their behavior with strain level. Mixtures are prepared with different volumetric sand fractions (sf) to identify response using small strain resonant column, intermediate strain oedometer, and large strain direct shear tests. The small strain shear modulus and damping ratio are determined with volumetric sand fractions. The asymmetric frequency response curve increases with decreasing sand fraction. Linear responses of shear strain and damping ratio with shear strain are observed at the mixture of sf=0.2. Vertical strain increases with decreasing sand fraction. Mixtures with $04.{\leq}sf{\leq}0.6$ show the transitional stress-deformation behavior from rubber-like to sand-like behavior. The friction angle increases with the sand fraction and no apparent peak strength is observed in mixture without sf=1.0.

• Journal of Mechanical Science and Technology
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• 제15권12호
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• pp.1816-1821
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• 2001

Two-dimensional blow-down type supersonic wind tunnel was designed and built to investigate the transient behavior of the startup of a supersonic flow from rest. The contour of the divergent part of the nozzle was determined by the MOC calculation. The converging part of the nozzle, upstream of fille throat was contoured to make the flow uniform at the throat. The flow characteristics of the steady supersonic condition were visualized using the high-speed schlieren photography. The Mach number was evaluated from the oblique shock wave angle on a sharp wedge with halt angle of 5 degree. The measured Mach number was 2.4 and was slightly less than the value predicted by the design calculation. The initial transient behavior of the nozzle was recorded by a high-speed digital video camera with schlieren technique. The measured transition time from standstill to a steady supersonic flow was estimated by analyzing the serial images. Typical transition time was approximately 0.1sec.

• 정보관리학회지
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• 제27권4호
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• pp.109-130
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• 2010

본 연구의 목적은 기자직의 웹 행동 분석을 통해 웹 정보탐색행위 패턴의 특성을 규명하는 것이다. 이를 위해 본 연구는 기자직 23명을 대상으로 트랜잭션로그를 수집하여 분석하였다. 데이터 수집을 위하여 분석 대상의 컴퓨터에 웹 트래킹 소프트웨어를 설치하였으며, 2주 동안 총 39,860개의 웹 로그가 수집되었다. 세션의 시작과 종료 패턴, 단계별 이행 패턴, 순차규칙 모형이 분석되었으며, 기자직과 일반인의 웹 이용 패턴을 비교하였다. 이를 토대로 기자직의 웹 정보탐색행위 패턴을 사실확인형 탐색, 사실확인형 검색, 조사형 탐색, 조사형 검색 등 4가지 형태로 유형화하였다.

• 한국실내디자인학회논문집
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• 제19권4호
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• pp.82-89
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• 2010

The studies published up to now, related to the correlation between spatial structure and visitors' behavior in a museum are rather relatively lacking when it comes to the in-depth consideration for the effect of the actual exhibition environment. So the main purpose of this study is to define the correlation between the light environment and the visitors' behavior. Towards this end, this study uses 'space syntax' to quantify the spatial structure with 'integration', 'connectivity' and 'control value'. Meanwhile, 'tracking score' and 'tracking frequency' were selected as the scope among the indices of behavior's analysis. The results of this study are as follows; First, integration and correlation of tracking score and tracking frequency are lowest when it comes to the extra large historical museums where the difference of intensity of illumination by each convex space. Meanwhile, the most considerable effect is exerted by control value. Compared to tracking score, tracking frequency is closely related to 'syntactic variables'. Second, visitors do not take the short cut the dark exhibition space even when very dark exhibition spaces continue after passing through relatively bright space. Analysis of visitors' behavior by control value in the exhibition space composed of this type of intensity of illumination environment is not valid. Third, visitors move to relatively brighter transitional space compared to the exhibition space with low intensity of illumination when passing through dark exhibition continually. Meanwhile, when visitors pass through the exhibition space there is some difference intensity of illumination they move to relatively dark exhibition center among the subsequent exhibition spaces. Accordingly, when the composition of exhibition space that continues onto the environment of low intensity of illumination is inevitable, differentiating intensity of illumination appropriately would be effective in inducing visit to the subsequent exhibition space.

• 한국지반신소재학회논문집
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• 제17권1호
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• pp.85-93
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• 2018

현행 고속철도 교대 접속부 표준단면은 교대배면에서부터 시멘트안정처리골재, 일반골재, 토공부로 하부 지지강성이 점진적으로 변화하도록 설계하고 있다. 일반골재와 토공부의 배면기울기는 기울기가 클수록 구조적으로 안정적이지만 이에 대한 명확한 기준이 없다. 따라서 본 논문에서는 대형 원심모형실험기를 이용하여 교대 뒤채움 배면구간의 토공과 일반골재의 기울기를 변화하여 현행 표준단면과 침하 및 지지력 특성을 비교하였다. 실험결과 철도하중이 경험하는 하중단계에서는 1:2단면과 1:1.5 기울기 단면이 거의 유사한 성능을 가지고 있는 것으로 평가되었다.

• 대한기계학회논문집B
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• 제32권7호
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• pp.549-557
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• 2008

Despite of the laminar-turbulent transition region co-exist with fully turbulence region around the leading edge of an airfoil, still lots of researchers apply to fully turbulence models to predict aerodynamic characteristics. It is well known that fully turbulent model such as standard k-model couldn't predict the complex stall and the separation behavior on an airfoil accurately, it usually leads to over prediction of the aerodynamic characteristics such as lift and drag forces. So, we apply correlation based transition model to predict aerodynamic performance of the NREL (National Renewable Energy Laboratory) Phase IV wind turbine. And also, compare the computed results from transition model with experimental measurement and fully turbulence results. Results are presented for a range of wind speed, for a NREL Phase IV wind turbine rotor. Low speed shaft torque, power, root bending moment, aerodynamic coefficients of 2D airfoil and several flow field figures results included in this study. As a result, the low speed shaft torque predicted by transitional turbulence model is very good agree with the experimental measurement in whole operating conditions but fully turbulent model(${\kappa}-\;{\varepsilon}$) over predict the shaft torque after 7m/s. Root bending moment is also good agreement between the prediction and experiments for most of the operating conditions, especially with the transition model.

• 디지털융복합연구
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• 제14권2호
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• pp.437-447
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• 2016

본 연구는 영화 '다우더'에 나타난 모녀 갈등을 분석하고, 통합적 관점에서 치료적 상담기법을 제안하고 있다. 융복합 심층심리학적 방법을 사용하여 무의식적 욕망이론에 의거하여 영화의 반복 관찰을 통해서 주인공의 무의식적 갈등을 파악하였다. 연구결과 무의식적 수준에서 참자기와 거짓자기, 자아이상과 초자아, 개별성과 의존성이 서로 다투고 있음을 알게 되었다. 치료적 상담을 위해서 상담초기에 가장 필요한 것은 내담자의 진정성 경험이다. 그리고 올바른 삶의 가치관을 확립한 상담가로서 내담자의 자아이상을 자극하고 참자기 욕동을 강화해야 한다. 또한 중간현상으로서의 종교 활동의 위험성을 알고 있어야 한다. 종결시점에서 상담가는 내담자의 웰빙(well-being)에 대한 희망을 가지고 지속적으로 변화 노력을 할 것을 기대한다.

• 인간행동과 음악연구
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• 제18권2호
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• pp.87-107
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• 2021

본 연구의 목적은 연주자가 사물놀이에서 경험하는 악기와의 대상관계 현상을 탐구하는 것이다. 이를 위해 연구자는 사물놀이 연주자 5명을 대상으로 반구조화된 개방형 질문을 통한 심층 면담을 시행하고 자료를 수집하였으며 Giorgi(2004)의 현상학적 연구 방법으로 분석하였다. 연구 결과, 121개의 의미단위, 7개의 하위 범주, 3개의 대범주가 도출되었다. 3개의 대범주는 '중간대상의 매체', '내적 욕구 표현 및 인식의 수단', '타인 인식과 소통의 도구'로 나타났다. 사물놀이에서 악기는 연주자에게 내적 몰입을 도와주는 대상 경험을 하게 하는 매체가 된다. 또한 연주자는 악기연주를 통해 자신의 내적 욕구를 표현하고 자신의 성격과 정체성에 대해 새롭게 인식한다. 이와 동시에 연주자는 악기 특성과 사물놀이에서의 역할에 따라 악기를 사람처럼 대상화하여 내적 표상을 형성하고 이를 중심으로 연주에서의 관계를 이해하고 타연주자와 소통한다. 마지막으로 사물놀이에서 악기는 연주자에게 이상적 자기 성격에 따른 대리적 대상의 역할을 한다. 본 연구의 결과는 사물놀이라는 합주 형태가 연주자의 대상관계 발달을 촉진하며 연주자의 내면화된 표상체계와 상호작용 방식을 외화하고 있음을 알 수 있게 해준다. 본 연구는 연주자와 악기 간의 심리내적인 기능적 관계를 밝히고 음악치료에서 사물놀이 악기 활용에 대한 기초를 제시해주었다는데 의의가 있다.

• 한국농공학회논문집
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• 제61권2호
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• pp.13-23
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• 2019

In this study, an overtopping model experiments and three dimensional seepage characteristics at the deteriorated homogeneous reservoirs were performed to investigate the behavior of failure for embankment and spillway transitional zone due to overtopping. The failure pattern, pore water pressure, earth pressure and settlement by overtopping were compared and analyzed. The pattern of the failure by overtopping was gradually enlarged towards reservoirs crest from the spillway transition zone at initial stage. In the rapid stage and peak stage, the width and depth of failure gradually increased, and the pattern of the failure appeared irregular and several direction of the erosion. In the early stage, the pore water pressure at spillway transitional zone was more affected as its variation and failure width increased. In the peak stage, the pore water pressure was significantly increased in all locations due to the influence of seepage. The earth pressure increased gradually according to overtopping stage. The pore pressure by the numerical analysis was larger than the experimental value, and the analysis was more likely to increase steadily without any apparent variation. The horizontal and vertical displacements were the largest at the toe of slope and at the top of the dam crest, respectively. The results of this displacement distribution can be applied as a basis for determining the position of reinforcement at the downstream slope and the crest. The collapse in the overtopping stage began with erosion of the most vulnerable parts of the dam crest, and the embankment was completely collapsed as the overtopping stage increased.

• International Journal of Control, Automation, and Systems
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• 제6권6호
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• pp.904-914
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• 2008

An action-selection-mechanism(ASM) has been proposed to work as a fully connected finite state machine to deal with sequential behaviors as well as to allow a state in the task program to migrate to any state in the task, in which a primitive node in association with a state and its transitional conditions can be easily inserted/deleted. Also, such a primitive node can be learned by a shortest path-finding-based reinforcement learning technique. Specifically, we define a behavioral motivation as having state-dependent value as a primitive node for action selection, and then sequentially construct a network of behavioral motivations in such a way that the value of a parent node is allowed to flow into a child node by a releasing mechanism. A vertical path in a network represents a behavioral sequence. Here, such a tree for our proposed ASM can be newly generated and/or updated whenever a new behavior sequence is learned. To show the validity of our proposed ASM, experimental results of a mobile robot performing the task of pushing- a- box-in to- a-goal(PBIG) will be illustrated.