• 한국운동역학회지
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• 제20권3호
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• pp.319-325
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• 2010

The purpose of this research was to investigate the differences in the ski carving turn motion according to level of expertise. The posture and movement of 6 skiers nearby the fall-line was evaluated with a biomechanical approach focusing the rotational mechanics. The slope was at an angle of $9^{\circ}$ and the following variables were measured and calculated: tangential velocity, change of COM height after passing fall-line, width between feet, angle between upper body and thigh, trunk angle, average radius of curvature and average centripetal force. The expert skiers minimized their center of mass height movement and maintained the width of between their feet after the passing the fall-line in comparison with the beginners and intermediate skiers. The experts restrained themselves from pushing their upper body downward after the turn to maximize the centripetal force. The experts in comparison with the beginners and intermediate skiers during the turn didn't have to reduce their radius of curvature to maintain a high centripetal force. It was concluded, that the most important factor affecting the centripetal force, was for the beginners and intermediate skiers, to minimize their movement while using the appropriate amount of edging.

• 한국환경복원기술학회지
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• 제13권6호
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• pp.63-74
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• 2010

In this study, wetlands and forest vegetation surrounding rail, road of DMZ area and Civilian Control Line were studied as follows: Plant communities hierarchical system of forest vegetation classified according to the results of phytosociological methods of Braun-Blanquet (1964) as; Quercus mongolica community, Quercus mongolica-Quercus variabilis community and Quercus acutissima -Quercus mongolica community. Wetland vegetation major communities; Scirpus wichurae community, Scirpus fluviatilis community, Juncus effusus var. decipiens community, Typha orientalis community, Typha angustata community, Juncus alatus community, Miscanthus sacchariflorus community, Phragmites communis-Miscanthus sacchariflorus community, Hragmites communis community, Phragmites communis-Alnus japonica community, Alnus japonica community, Phragmites japonica community, Salix koreensis community, Prunus padus community, Alnus japonica community, Zizania latifolia community and Amorpha fruticosa community were surveyed. Coastal sand dune vegetation in a DMZ area and the Civilian Control Line was mainly characterized by; Carex pumila, Elymus mollis, Carex kobomugi, Rosa rugosa, Calystegia soldanella, Lathyrus japonica and Aster hispidus, species that are of typically sand dune vegetation.

• 한국레이저가공학회지
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• 제12권1호
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• pp.19-24
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• 2009

Because of its fast and precise welding performance, laser welding is becoming a new excellent welding method. However, the precise focusing and robust seam tracking are required to apply laser welding to the practical fields. In order to laser weld a type of T joint like a circular pipe on a square pipe, which could be met in the three dimensional structure such as an aluminum space frame, a visual sensor system was developed for automation of focusing and seam tracking. The developed sensor system consists of a digital CCD camera, a structured laser, and a vision processor. It is moved and positioned by a 2-axis motorized stage, which is attached to a 6 axis robot manipulator with a laser welding head. After stripe-type structured laser illuminates a target surface, images are captured through the digital CCD camera. From the image, seam error and defocusing error are calculated using image processing algorithms which includes efficient techniques handling continuously changed image patterns. These errors are corrected by the stage off-line during welding or teaching. Laser welding of a circular pipe on a square pipe was successful with the vision tracking system by reducing the path positioning and de focusing errors due to the robot teaching or a geometrical variation of specimens and jig holding.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 춘계학술대회논문집
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• pp.706-711
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• 2001

A dynamic vibration absorber(DVA) is developed to reduce the excessive focusing vibration of an optical disc drive(ODD) originated from the resonance of an wobble disc. We design the material properties of the DVA by FEM model such as Young's modules, damping coefficient, shapes and dimensions, analyze its dynamic characteristics and provide its design guide line for suppressing the vibration of an optical disc drive. To examine the performance. of the DVA, the vibration of the wobble disc and the feeding system is measured by using a laser vibrometer and the noise level is checked by using microphone. The result shows that the proposed DVA reduces the vibration and. the noise in an optical disc drive.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2005년도 추계학술대회 논문집
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• pp.510-515
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• 2005

Since 1974, the first subway is constructed in Seoul metropolitan area, from 1985 country metropolitan subways have been built. But most country metropolitan subways cannot reach the goal of transportation sharing ratio and show a loss. In this paper, I investigate the issues of country metropolitan subways and present the methods to improve them focusing on strengthening transit network. At first, it is introduced that the method can complement incomplete network from insufficient subway lines. And I propose the consolidation method using KORAIL railway lines. Finally, the connecting method into subway missing area is presented with various transit systems like BRT, Guideway Bus and single railway line extension.

• 한국지리정보학회지
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• 제8권4호
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• pp.52-60
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• 2005

본 연구에서는 부산시의 대표적인 주거지역이면서 워터프런트지역을 포함하고 발전해 온 수영구와 해운대구를 중심으로 지가와 주거환경요소의 상관성 및 주거환경요소가 지가에 미치는 영향을 고찰해 보고자 했다. 이를 위해 지가를 종속변수로 하고 주거환경요소를 설명변수로 하여 상관분석 및 회귀분석을 실시하였다. 먼저 지가와 각 변수간의 상관성을 보면 모든 대상지역에서 토지이용과 간선도로와의 거리, 지하철역까지의 거리가 공통적으로 지가와 상관성이 높은 변수로 밝혀졌고, 회귀분석을 통해 각 변수별 설명력을 알아본 후 지가에 대한 변수의 설명력이 높은 순으로 누적 설명력을 살펴본 결과 7개의 변수로 수영구는 67%, 해운대구는 50.5%의 설명력이 있는 것으로 드러났다. 또한 본 연구에서 특히 관심을 가지고 설정해 본 해안까지의 거리변수는 지가와 상관분석 결과 모든 대상지역에서 그다지 상관성이 높지 않았으며, 회귀분석 결과에서도 각 지역별로 6.4%~7.6%의 설명력을 갖는 것으로 밝혀져 지가를 설명하는 변수로서 중요도도 높지 않은 것으로 나타났다.

• 복식
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• 제63권6호
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• pp.140-149
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• 2013

The study aims to suggest new skirt designs through a modernistic application of the silhouette of Hanbok skirts. It also aims to promote the aesthetic beauty and excellence of Hanbok to the world by using Hanbok skirts that best express the beauty of Korea as motifs, and to promote a pride in Korean culture through a reinterpretation of Hanbok skirts. The study was focused on examining Hanbok skirts from the Three Kingdoms era to the Joseon Dynasty, and the skirts in each era were compared to western silhouettes to suggest design centering on the characteristics of each silhouette. As for the theoretical background, shapes were classified according to waist-grip, the width and length of a skirt, wrinkles and ornamental lines, before being compared to skirt silhouettes of western costume. As a result, it was found that Hanbok skirt silhouettes in the Three Kingdoms era were similar to the A-Line silhouette of western costume, the Empire silhouette of unified Silla, the H-Line silhouette of the Goryeo Dynasty, the Bell-Line silhouette of the Joseon Dynasty and the Bustle Style applied to ceremonial costume in the early Joseon Dynasty. The researcher suggested five skirt designs by applying the above-mentioned five silhouettes, confirming the research premise that Hanbok skirt silhouettes are as diversified as those found in western costume. Designs were suggested for each silhouette, and are expected to lead to the development of designs befitting future trends and concepts through detailed research and development on Hanbok skirt silhouettes.

• 대한토목학회논문집
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• 제39권5호
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• pp.613-621
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• 2019

지하철역사의 일반적인 환승통행은 노선간환승과 역사환승을 의미한다. 노선간환승은 다른 두 노선의 열차를 갈아타기 위하여 환승통로와 같은 수평보행시설을 통해 이동한다. 역사환승은 스마트카드 진출입 단말기노선과 승하차 열차노선이 다른 상황에서 발생하는 보행통행으로 계단, 에스컬레이터와 같은 수직보행시설을 이용하면서 환승통로를 함께 이용하는 통행이다. 이러한 환승의 가정은 지하철 네트워크를 운행하는 모든 노선은 완행 또는 급행의 단일노선에 한정되었다는 한계를 포함하고 있다. 따라서 완행과 급행이 동일노선으로 운영되는 상황에서 노선내에서 발생되는 환승에 대한 검토가 수행되지 않았다. 노선내환승은 메트로9호선과 같이 급행 및 완행 정차역이 동일노선에서 운행되는 상황에서 발생한다. 본 연구는 스마트카드 자료기반의 급행 및 완행열차가 동일노선에 존재하는 지하철네트워크를 대상으로 노선내환승을 분석하는 방법론을 구축한다. 이를 위해 급행 및 완행열차를 분리하기 위한 네트워크확장기법을 구축하고 최소시간경로를 선택하는 과정에서 동일 노선의 내부 환승이 재현되는 경로선택모형을 제안한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.7-13
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• 2011

RAMS is the procedure to maximize the reliability and availability of systems with managing operation rate, the frequency of failure in the system and repair method. Recently, all system life-cycle focusing on RAMS process has been rapidly developing in the field of railway vehicles, for example, applying th reliability management techniques for procurement and disposal of EMU. In particular, global economic recession require to reasonable measures for the EMU maintenance costs under the circumstances therefore, an alternative solution based on RCM(Reliability Centered Maintenance) which is the optimal maintenance method is interested. In this study, the state of being critical of each component and a primary factors was analyzed to improve VVVF inverter of the line 7 EMU by applying FMECA process. Furthermore, this paper showed the impact of connecting between the main and sub system. Based on these data, critical components according to malfunction ratings were classified by screening measures and improvements for each components was summarized.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.1412-1417
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• 2011

Safety is soaring up as a core value in accordance with the recent improvement of operating speed & incidents. rolling stock is a kind of system which works together with several components. one component has an effect on the sub-system, which can cause to the train safety operation, therefore reliability management of the major components of rolling stock is a kind of solution to the safety operation of train, but realistically maintenance in korea performed based on period rather than TBO of major components, but Japan does new maintenance system based on the major components, which optimizes maintenance tasks. actually Japan can apply to new maintenance system because they are ready in planning step but in this study, making a reliability data of major components and review the adaptability of new maintenance system to the rolling stock operating in Ansan line.