• 한국운동역학회지
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• 제12권1호
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• pp.173-191
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• 2002

The purpose of this study was defined efficient throw motion pattern to obtain the quantitative data and to achieve successful bowling through kinetic - kinematic variables on the throw motion. Subject of group composed of three groups : Higher bowlers who are two representative bowlers with 200 average points and one pro-bowler. Middle bowlers who are three common persons with 170 average points. Lower bowler who are three common persons with 150 average points. Motion analysis on throw motion in three groups respectively has been made through three-dimension cinematography using DLT method. Two high-speed video camera at operating 180 frame per secondary. One-way ANOVA has been used to define variable relations. Analyzed result and conclusion are the following : The displacement of back of the hand must have wider difference of each right-left displacement to increase the spin of the ball. In high bowlers group, difference between the front-rear position of back of the hand in case of success and that in case of failure in follow throw is 0.17m. That is to say, momentum in case of success come to increase greatly, compared with that in case of failure. To increase the spin of the ball, the potential difference should be narrower in follow through. In case of the high bowlers, the velocity of the front-rear direction of the back of the hand has been the fastest both in release and follow through, compared with those in other groups, which has contributed to increasing the spin force of the ball. The orders in the resultant velocity of the back of the hand has shown the this : the finger tip$\rightarrow$the back of the hand$\rightarrow$wrist.These orders made the proximal segment support the distal segment. The distal segment has provided the condition to accelerate the velocity. In case of failure, the suddenly increased velocity has caused the failure in the follow through. Acutely flexing the angle of the back of the hand has contributed to lifting to increase the spin of the ball.

• 한국게임학회 논문지
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• 제9권2호
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• pp.81-93
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• 2009

본 논문은 21세기 지식기반 경제의 가치 창출 원천이 새로운 아이디어와 창의성의 주체인 인적자본에 있음을 근거로 국내 온라인게임 기업 인적자본 운영의 효율성을 연구해보았다. 온라인게임 산업은 최근 국가 신성장 동력으로 주목 받고 있는 문화콘텐츠 서비스업의 하나로, 세계 최고의 기술과 콘텐츠를 기반으로 하여 높은 연평균 성장률과 수출 공헌도를 보이고 있는 산업이다. 이런 맥락에서 본 논문은 인적자본이론, 지식경제이론, 경제성장이론에 기초하여 온라인게임 산업에서 인적자본이 지속적인 성장을 견인할 수 있음을 이론적으로 규명하였다. 또한 대표적인 비모수적 분석모형인 자료 포락 분석(DEA)을 통하여 국내 온라인게임 기업의 인적자원 운영 규모, 투자, 교육, 보상의 투입 효율성을 기업의 산출이라고 할 수 있는 매출을 기준으로 실증 분석 하였다. 이 연구를 통해 국내 온라인게임 기업들에게 미래의 지속 가능한 성장 동력인 인적자본을 운영함에 있어 최적의 효율성을 달성할 수 있도록 전략적 시사점을 제공할 수 있을 것이다

• 한국멀티미디어학회논문지
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• 제8권4호
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• pp.450-460
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• 2005

컴퓨터 및 통신기술의 급속한 발전으로 인해 동영상 정보는 인터넷 및 사회전반의 다양한 분야에서 활용되고, 그 수가 기하급수적으로 증가되고 있다. 동영상 정보 분석 시스템은 기본적으로 텍스트를 기반으로하기 때문에, 동영상 정보가 가지는 애매성을 표현하기 곤란하며, 주석 작성에 따르는 과다한 작업부담 및 객관성 결여 등의 문제점을 가지고 있다. 본 논문에서는 대용량의 동영상 정보를 효율적으로 분석 하기 위해 있는 동영상 이미지의 분할영역에서 색상정보와 모양정보를 이용한 방법을 제안하고자 한다. 분할영역은 영역성장과 결합 방법을 사용한다. 색상정보를 추출하기 위해서는 기존의 RGB 방식에서 HSI방식으로 색상변환 하여 대표색상과 매칭되는 특징 정보를 사용한다. 그리고 모양정보는 물체의 윤곽선에 해당하는 화소들만을 대상으로 연산을 수행하는 향상된 불변 모멘트(Improved Moment Invariants : IMI)를 이용한다.

• 한국실내디자인학회논문집
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• 제24권6호
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• pp.145-153
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• 2015

For this research with the objects of spaces in two department stores which can be referred to as representative facility of commercial space, observation test has carried out to estimate how much visitors rivet their eyes to the display of shops. In addition, to find out what effect the difference among the department types has on the selective attention to space element, the observation time was applied as a medium for estimation. The followings are the result from analyzing the observation frequency and the observation intensity feature of each section where the characteristics of design could be found at attention. First, both images of A and B had concentrative dominant-observation at left shops. In case of Image A, Customers began to observe the right shops very attentively after 25 seconds, and with Image B, the attentive observation at right and left took place alternatively after 35 seconds. In other words, regardless of the characteristics of shop displays, the left shops were observed first while in case of the observation after the early and middle time-frame the characteristics of shops were found to have effects on observation. Second, the normal observation showed some difference among attention sections over time while on the whole both images of A and B had the same highly attentive observation at the middle space. Accordingly, it could be concluded that the middle space was playing a faithful role as background for commercial spaces. Third, the ignorant observation, which is the opposite to the attentive observation, was found different between the images of A and B. When the ignorant observation is considered to have intentionality, it will be possible to set up the display which may attract the attention aggressively by the process of figuring out the characteristics of ignored shops.

• Earthquakes and Structures
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• 제11권3호
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• pp.483-503
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• 2016

This study aims to evaluate seismic performance of existing low and mid-rise reinforced concrete buildings by comparing their displacement capacities and displacement demands under selected ground motions experienced in Turkey as well as demand spectrum provided in 2007 Turkish Earthquake Code for design earthquake with 10% probability of exceedance in 50 years for soil class Z3. It should be noted that typical residential buildings are designed according to demand spectrum of 10% probability of exceedance in 50 years. Three RC building sets as 2-, 4- and 7-story, are selected to represent reference low-and mid-rise buildings located in the high seismicity region of Turkey. The selected buildings are typical beam-column RC frame buildings with no shear walls. The outcomes of detailed field and archive investigation including approximately 500 real residential RC buildings established building models to reflect existing building stock. Total of 72 3-D building models are constructed from the reference buildings to include the effects of some properties such as structural irregularities, concrete strength, seismic codes, structural deficiencies, transverse reinforcement detailing, and number of story on seismic performance of low and mid-rise RC buildings. Capacity curves of building sets are obtained by nonlinear static analyses conducted in two principal directions, resulting in 144 models. The inelastic dynamic characteristics are represented by "equivalent" Single-Degree-of- Freedom (ESDOF) systems using obtained capacity curves of buildings. Nonlinear time history analysis is used to estimate displacement demands of representative building models idealized with (ESDOF) systems subjected to the selected ground motion records from past earthquakes in Turkey. The results show that the significant number of pre-modern code 4- and 7-story buildings exceeds LS performance level while the modern code 4- and 7-story buildings have better performances. The findings obviously indicate the existence of destructive earthquakes especially for 4- and 7-story buildings. Significant improvements in the performance of the buildings per modern code are also obvious in the study. Almost one third of pre-modern code buildings is exceeding LS level during records in the past earthquakes. This observation also supports the building damages experienced in the past earthquake events in Turkey.

• 한국철도학회논문집
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• 제12권6호
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• pp.1049-1058
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• 2009

한국의 철도공장은 철도도입과 함께 설립되었고 근대기 산업건축의 중심이 되었다. 한국 철도공장의 대표적 사례인 용산공장에는 근대기 건물이 다수 현존하는데, 특히 규모를 잘 보존하고 있어 이를 중심으로 근대기 건물의 건축적 특성을 살펴보고자 한다. 한국의 철도공장은 입지조건이 적합한 곳에 건립되었고, 작업공정에 따른 시설 배치, 각각의 용도와 기능에 따른 독특한 구조 및 단면 입면의 형태를 갖고 있고 철골구조와 철근콘크리트 구조를 적극 도입하여 구조적 변환기로서의 특성을 보여주고 있다. 따라서 철도공장이 한국 근대 공장건축의 초기적 특성을 갖고 있고 한국 근대기의 산업건축유산으로써, 중요한 가치를 지닌 과제임을 밝히려 한다.

• 한국통신학회논문지
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• 제18권3호
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• pp.327-338
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• 1993

본 논문에서는 일반적 형태의 고차원 펄스신호에 대한 푸리에 변환을 구하는 새롭고 용이한 방법을 제안한다. 우선 일반적 형태의 부분응답 전송시스템 모델을 수정하여 n-차 펄스신호의 푸리에 해석을 위한 새로운 모델을 설정하고, 그로부터 차수에 대하여 순환적으로 작용하는 대표 관계식을 유도한다. 이러한 대표 관계식으로부터 목록 찾아보기 방식의 푸리에 변환법을 위한 일반적 뼈대공식을 형성시킨다. 이 때, 각각의 찾아보기 목록은 해당 펄스신호의 모든 차수에 대하여 그 푸리에 변환을 뼈대공식으로 구하기 위해 필요한 모든 매개변수를 포함하게 된다. 고차원 펄스 신호에 대한 푸리에 변환과정의 복잡성과 계산량등을 비교하여 볼 때, 본 논문에서 제시하는 방법은 기존의 방법에 비하여 대단히 간단하고 계산시간을 단축시킨다. 특별히 몇몇 펄스의 고차 형태는 매우 좁은 폭을 갖게 되는데, 이는 최근 지대한 관심을 불러 일으키고 있는 극초단 펄스의 형태를 근사화 하며, 본 논문에서 제시하는 방법은 이들에 대하여 진가를 발휘한다.

• Steel and Composite Structures
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• 제17권3호
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• pp.215-236
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• 2014

The flexural behaviour of steel beams significantly affects the structural performance of the steel frame structures. In particular, the flexural overstrength (namely the ratio between the maximum bending moment and the plastic bending strength) that steel beams may experience is the key parameter affecting the seismic design of non-dissipative members in moment resisting frames. The aim of this study is to present a new formulation of flexural overstrength factor for steel beams by means of artificial neural network (NN). To achieve this purpose, a total of 141 experimental data samples from available literature have been collected in order to cover different cross-sectional typologies, namely I-H sections, rectangular and square hollow sections (RHS-SHS). Thus, two different data sets for I-H and RHS-SHS steel beams were formed. Nine critical prediction parameters were selected for the former while eight parameters were considered for the latter. These input variables used for the development of the prediction models are representative of the geometric properties of the sections, the mechanical properties of the material and the shear length of the steel beams. The prediction performance of the proposed NN model was also compared with the results obtained using an existing formulation derived from the gene expression modeling. The analysis of the results indicated that the proposed formulation provided a more reliable and accurate prediction capability of beam overstrength.

• 한국컴퓨터정보학회논문지
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• 제16권4호
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• pp.73-81
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• 2011

본 논문에서는 모델 히스토그램 개수를 적응적으로 조절하는 블록기반의 배경 모델링 방법을 제안한다. 기존의 블록 기반의 배경 모델링 방법은 각 블록에 대한 모델 히스토그램의 개수를 고정한다. 따라서 조명변화와 움직이는 객체에 대해 오검출이 발생하는 문제가 있고 움직임이 없는 객체에 대해서는 검출이 되지 않는 문제가 있다. 또한 입력영상의 종류마다 달라질 수 있는 최적의 모델 히스토그램의 개수를 수동적으로 찾아야 하는 문제가 있다. 본 논문에서는 실험을 통해 엘리베이터 내에서 조명변화가 있고 객체가 움직이는 상황과 조명변화가 없고 객체가 정지해 있는 상황에 대해 기존의 방법과 성능을 비교하여 제안한 알고리즘의 효용성을 입증한다.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2012년도 춘계학술대회 논문집
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• pp.763-768
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• 2012

Active window system which can reduce the environmental noises, such as traffic noise and construction noise, from an open window into a room was proposed in the previous works. The key idea of the proposed active window system was that the control sources are approximately collocated with the primary noise source in terms of the acoustic power for global noise reduction throughout the interior room. Moreover, because it is important not to intrude into the living space in the building environment, no error sensors were used and an open-loop control method using control sources at the window frame and the reference sensors outside the room was used for the proposed system. The open-loop control gain was calculated by the interior room model assumed as the semi-infinite space, and the interior sound field was estimated by Rayleigh integral equation under the baffled window model assumption. However, windows with a finite thickness should were considered for the calculation of the open-loop control gain of the active window system since these are representative of most window cases. Therefore, the finite thickness window model based on the Sgard's model was derived and the open-loop control gain using the interior sound field estimated by that model was calculated for active window system. To compare the performance of these two models, a scale-model experiment was performed in an anechoic chamber according to noise source directions. Experimental results showed that the performance for the thickness window model is better than the baffled window model as the angle with respect to the perpendicular direction is larger.