• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.138-143
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• 2000

In order to maintain the faith and accuracy with precision of machinery, it is recently required the precise comprehension about approach which is appeared in the contact area between two bodies, because approach affects the static stiffness and dynamic characteristic of contact area. This study applied H. Hertz's circle contact area theory as much lower measuring force. It is measured approach influenced by various factors which were concerned with contact errors like material, form of two bodies, using calibration tester. As a result, the following conclusion can be obtained. 1) The approach appears greatly in order of carbon steel(SM20C), aluminum(A601-T6) and high density polyethylene(5305E) 2) The approach appears in order of concave, disc, convex form, in the ration of contact area size by the difference of curvature.

• 한국정밀공학회지
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• 제15권3호
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• pp.88-98
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• 1998

In many automatization applications, a rigid body is required to go forward and backward repeatedly through a set of given position/orientations precisely while a crank is rotated. Such a motion can be generated by 6 bar mechanism adding a dyad to a 4 bar mechanism. If this is the case for 3 position synthesis of the 4 bar mechanism, the feasible solution area for designing the 4 bar mechanism will be limited over the general solution area. This paper proposes a procedure to synthesize 4 bar mechanism to be used to generate the required motion. It is found that the only input crank of the 4 bar mechanism should be limited to satisfy the condition. And the feasible design area for the circle point/ center point of the input crank is identified so that design of the undesired mechanism could be avoided. The method is tested and the results are shown.

• 산업융합연구
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• 제2권1호
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• pp.121-137
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• 2004

Is entering in age that brand becomes consumer's goods purchase standard as income level is improved, dying injunction brand is trend that governing power in the world market is expanded as international economy does single market. Situation to develop Kyonggi Province area to universal tourist attraction area keeping in step with national large size event holding such as sun of Korean visit with opening a port of the In-chon International airport, the world ceramics Expo, World Cup was made up. Growth possibility is big to culture tourism resources and representative tourist resort of the Korea that use view of nature photon circle properly such as ceramics that target area possesses. Area development plan through growth possibility should be arranged to international ceramics production complex and distribution complex. Therefore, plan analyzing future district theme establishment and strength in priority via past and present of target area.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 춘계학술대회
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• pp.295-298
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• 2004

Situation to develop Kyonggi Province area to universal tourist attraction area keeping in step with national large size event holding such as sun of Korean visit with opening a port of the In-chon International airport, the world ceramics Expo, World Cup was made up. Growth possibility is big to culture tourism resources and representative tourist resort of the Korea that use view of nature photon circle properly such as ceramics that target area possesses. Area development plan through growth possibility should be arranged to international ceramics production complex and distribution complex. Therefore, plan analyzing future district theme establishment and strength in priority via past and present of target area.

• 한국농촌건축학회논문집
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• 제2권2호
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• pp.1-10
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• 2000

The traditional farm houses in Yongdong area of Kangwon province have a different spatial structure from those of the other areas because of the characteristics of the climatic, geographic and sociocultural circumstances between the Taebaek mountains and the East Sea. So the purpose of this study is aimed at grasping how the spatial features of traditional farm houses in Yongdong area have been different in each regional circle. The plans of traditional farm houses of this region which are four types - ㅡ typed house without floor, ㅡ typed house with floor, ㄱ typed house without floor, ㄱ typed house with floor - show very similar but different space arrangements.

• 한국위험물학회지
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• 제6권2호
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• pp.62-67
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• 2018

It is very important to classify explosion hazardous area in order to prevent an accident explosion. In order to prevent such a explosion, the Industrial Safety and Health Standards Rules stipulates the establishment and management of explosion hazards in accordance with the criteria set by the Korean Industrial Standards. This study has investigated the range of the explosion hazardous area according to various hole sizes, pressures, vapor densities, and wind velocities in the outdoor flammable liquid tank using KS C IEC-60079-10-1 $2^{nd}$ Ed.(=IEC CODE) and PHAST. The results show that the explosion hazardous areas by IEC CODE have circle shapes. However, the areas by PHAST show ellipse shapes. The different of the explosion hazardous areas increases with the increase of wind velocity.

• 한국도로학회논문집
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• 제18권6호
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• pp.153-160
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• 2016

OBJECTIVES : The objective of this study is to develop a traffic accident model of a roundabout based on the type of land use. METHODS : The traffic accident data from 2010 to 2014 were collected from the "traffic accident analysis system (TAAS)" data set of the Road Traffic Authority. A multiple linear regression model was utilized in this study to analyze the accidents based on the type of land use. Variables such as geometry and traffic volume were used to develop the accident models based on the type of land use. RESULTS : The main results are as follows. First, the null hypothesis that the type of land use does not affect the number of accidents is rejected. Second, four accident models based on the type of land use have been developed, which are statistically significant (high $R^2$ values). Finally, the total entering and circulating volumes, area of the central island, number of speed breakers, mean number of entry lanes, diameter of the inscribed circle, mean width of the entry lane, area of the roundabout, bus stops, and number of circulatory roadways are analyzed to see how they affect the accident for each type of land use. CONCLUSIONS : The development of the accident models based on the type of land use has revealed that the accident factors at a roundabout are different for each case. Thus, more speed breakers in commercial areas and an inscribed circle of proper diameter in commercial and residential areas are determined to be important for reducing the number of accidents. Additionally, expanding the width of the entry lanes, decreasing the area of the roundabouts in residential areas, and reducing the conflict factors such as bus stops in green spaces are determined to be important.

• 한국통신학회논문지
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• 제37권8C호
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• pp.711-720
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• 2012

본 논문에서는 운전자 졸음 인식 시스템의 구현 방법과 그에 따른 결과를 소개한다. 영상 입력 장치로는 시중에 판매되는 웹캠 카메라를 사용하였다. 얼굴 검출 방법으로는 Haar 변환 기법을 이용하였으며, 다양한 조명 환경에 강건하게 적응하도록 조명정규화를 수행하였다. 조명정규화를 거친 얼굴 영상은 특징값 추출에 용이하다. 조명정규화를 통한 눈 후보영역은 인체측정학 정보를 이용하여 후보 영역을 줄인 이후에 PCA와 Circle Mask의 혼합 모델을 적용했다. 위 방법을 통해 차량 내부의 복잡한 조명 환경 속에서 강건히 눈 영역을 추출한다. 검출된 눈 영역은 고해상도의 조명 정규화 영상과 간단한 연산을 통하여 졸음 여부를 판별한다. 졸음 상태가 1단계로 판단 될 경우에는 통합 모니터링 인터페이스에서 운전자에게 경고음을 울리며 2단계일 경우에는 CAN(Controller Area Network)를 통하여 안전벨트를 진동하게 함으로써 운전자에게 경고를 준다. 본 논문에서 제안하는 졸음 인식 시스템은 낮은 계산 복잡도를 만족하는 동시에 높은 인식률을 보여준다. 실험 결과 차량 내에서 97%의 인식률이 나타났다.

• 한국정보과학회논문지:데이타베이스
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• 제33권6호
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• pp.631-643
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• 2006

시간이 변함에 따라 위치 좌표를 변경하는 모바일 환경에서 이동 객체는 자신의 위치를 기준으로 질의를 요청한다. 연속적인 스카이라인 질의 처리를 위한 효율적인 영역 결정 기법에서는 이동 객체의 속도와 방향과는 무관한 최적화된 스카이라인 영역(OSR: Optimal Skyline Region)을 미리 계산하여 질의에 답할 수 있다. 이에 따라 이동 객체의 위치를 중심으로 하고 가장 가까운 영역 변까지의 거리를 반경으로 하는 원(Vcircle: Validity Circle)을 유효 영역으로 결정하여 질의 발생 빈도를 감소하는 기법이 제안되고 있다. 그러나 원은 최초 질의가 발생한 시점의 이동 객체 위치에 따라 면적이 가변적이므로 질의 발생 빈도도 가변적이고, 객체가 최적화된 스카이라인 영역 내에서 이동하는 경우에 재질의가 빈번하게 발생하는 문제점이 발생한다. 예를 들어 사용자는 '현재 위치에서 가깝고 숙박료가 싸고, 해변과의 거리가 가까운 호텔을 검색하라'는 질의를 할 수 있다. 이 경우, 이동 객체와 대상 객체의 거리뿐만 아니라 대상 객체의 다중 속성을 고려해야하고, 스카이라인 질의 결과는 이동 객체의 현재 위치와 대상 객체의 거리에 따라 유효하지 않을 수 있으므로 이동 객체의 위치 변경에 따라 스카이라인을 재계산해야 하며, 새로운 결과를 요청하기 위해 연속적인 질의가 발생한다. 이 논문에서는 항상 볼록 다각형을 형성하는 최적화된 스카이라인 영역의 특징을 이용하여 스카이라인 영역의 최대내부원(IVcircle: Interior Validity Circle)을 정적 유효 영역으로 결정하는 기법을 제안한다. 실험을 통하여 영역내의 평균 질의 발생 빈도를 기존의 Vcircle을 이용한 동적 유효 영역 결정 기법보다 평균 52.55%가 감소함을 보인다.

• 한국농공학회지
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• 제45권3호
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• pp.103-115
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• 2003

This study examines groundwater movement system analysis and movement forecast algorithm using finite element method. The target is Cheongha-myeon area, Bukgu, Pohang-city which has many difficulties in water supply during drought period. From the comparison of the differences between obtained values by WINFlOW model and observed values, it is thought that groundwater head distribution under steady flow is reflected well at the level of reliability Groundwater movement of study area shows stable pattern from western watershed to eastern coastal area while flow path is dense and steep in the center of the coastal area. The results of particle tracing for each well show a comparatively straight line from the western boundary side to the observation position at the upper area of the well, and are analyzed as it diffuses according to getting closer to the coast at the lower area of the well. The result of effect circle examination attendant on pumping amount in study area shows variation tendency that groundwater head decreases at the side and the lower area more than at the upper area of the well when groundwater flows from west to east(coast). As mentioned above, satisfactory results of groundwater movement analysis using WINFlOW model, two dimensional groundwater movement analysis model, are obtained through the great decrease of physical uncertainty of groundwater movement system.