• 한국안전학회지
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• 제22권6호
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• pp.1-6
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• 2007

A Recently elevator accidents were occurred and increased due to carelessness of user and violent behavior. The accident of door detachment in elevator platform by electronic motor scooter show a example of safety concerns and insensibility for safety awareness. In this report, we review the cause of accident of door detachment in elevator platform by electronic motor scooter, and show some suggestions of preventing from the safety concerns about this case.

• 한국멀티미디어학회논문지
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• 제9권8호
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• pp.1010-1019
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• 2006

캐드(CAD) 시스템은 우리가 사용하는 대부분의 산업 제품을 제작하는데 필수적으로 사용되고 있는 중요한 기술로 알려져 있다. 캐드 기술은 컴퓨터 그래픽스 기술의 발달과 더불어 상업용 3차원 캐드 시스템으로 영역을 확장해 나가고 있다. 특히, 신발제조와 같은 특수한 영역의 캐드 시스템들도 3차원 캐드로 발전해 나가고 있다. 그러나 캐드 소프트웨어의 개발의 어려움으로 인해 소수의 메이저급 캐드 소프트웨어 회사를 제외하고는 대부분이 3차원 개념을 제공하는 AutoCAD에 종속적인 소프트웨어를 개발하고 있다. 뿐만 아니라 실제의 작업 현장에서 일하는 많은 신발 캐드 디자이너들은 직접 신발 디자인을 종이에 그리는 교육을 받아 3차원 캐 보다는 2차원 캐드에 더 익숙하고, 작업 효율도 훨씬 뛰어남을 보이고 있다. 이에 본 연구에서는 현장 실무자들의 작업 방식과 3차원 캐드 소프트웨어가 주는 장점을 결합한 3차원 신발 캐드 시스템을 설계 할 것이다. 본 시스템은 다른 신발 캐드 시스템들과 달리 OpenGL을 기반으로 하여 어느 플랫폼에서 잘 작동하도록 설계할 것이다. 또한 3차원 신발 설계 시스템에서 가장 중요한 부분인 3차원 캐드데이터와 2차원 캐드 데이터의 호환 방법을 제시하고, 다양한 크기의 신발 제작에 필수적인 여러 할출(grading) 기법을 제시할 것이다.

• 대한의용생체공학회:의공학회지
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• 제10권3호
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• pp.269-278
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• 1989

The initial impact at foot strike is produced by a slider type mechanical model, which can be measured using a force platform to evaluate various shoes. The lower extremity and foot motion was filmed by a 16mm high speed movie camera and several points on the rear half of the shoe and those near the trochanter and the lateral epicondyle were digitized to provide the linear and angular positions and velocities during impact. With these observed kinematics, a slider type foot strike simulator composed of guide rail and sliding dummy is designed. The simulator system makes the artificial foot of the dummy with running shoe on it to follow the foot strike motion. The dummy has the relevant mass-spring-damper system modeled after McMahon's. The motion of the model is drived by the gravity force and the generated motion alone with the ground reaction forces are monitored by the same procedures afore mentioned producing the initial foot strike impact similar to the onto observed in human gait.

• 제어로봇시스템학회논문지
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• 제12권9호
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• pp.926-934
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• 2006

This paper proposes intelligent control of a virtual walking machine that can generate infinite floor for various surfaces and can provide proprioceptive feedback of walking to a user. This machine allows users to participate in a life-like walking experience in virtual environments with various terrains. The controller of the machine is implemented hierarchically, at low-level for robust actuator control, at mid-level fur platform control to compensate the external forces by foot contact, and at high-level control for generating walking trajectory. The high level controller is suggested to generate continuous walking on an infinite floor for various terrains. For the high level control, each independent platform follows a man foot during the swing phase, while the other platform moves back during single stance phase. During double limb support, two platforms manipulate neutral positions to compensate the offset errors generated by velocity changes. This control can, therefore, satisfy natural walking conditions in any direction. Transition phase between the swing and the stance phases is detected by using simple switch sensor system, while human foot motions are sensed by careful calibration with a magnetic motion tracker attached to the shoe. Experimental results of walking simulations at level ground, slope, and stairs, show that with the proposed machine, a general person can walk naturally on various terrains with safety and without any considerable disturbances. This interface can be applied to various areas such as VR navigations, rehabilitation, and gait analysis.

• 한국가정과학회지
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• 제6권2호
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• pp.67-81
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• 2003

This study is for analyzing relationship between clothing and shoes design in the 20th century fashion through studying changes of fashion style. At the beginning of the 20th century, the length of skirts became shorten, so that shoes can be shown. For the result of that. shoes has been developed rapidly in its shape, color, material and ornament with having relations with clothes. The 1st World War made fashion to change into economical style. According to that, shoes also changed with regarding its activities and economical efficiency. In the middle of the 20th century. according to the development of mass media. the stars fashion influenced on the trends of clothes and shoes. As young generation. who leads fashion trends, prefer easy and active clothes, shoes also changed into easy style, sneakers were worn widely and platform sole was applied into various shoes. As a result of this study, shoes design was dynamically changed according to fashion style. The study on its functional efficiency is actively studied now however. the study of shoes design is not. When regarding shoes were always worn with clothes, it is impossible to think shoes and clothes are two things. and also I hope the study on relations between clothes and shoes can be more active and consistently implemented.

• 한국운동역학회지
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• 제15권4호
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• pp.153-168
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• 2005

The purposes of this study were to determine the influence of midsole hardness and sole thickness of sports shoes on ball flex angle and position with increment of running velocity. The subjects employed for this study were 10 college students who did not have lower extremity injuries for the last one year and whose running pattern was rearfoot striker of normal foot. The shoes used in this study had 3 different midsole hardness of shore A 40, shore A 50, shore A 60 and 3 different sole thickness of 17cm, 19cm, 21cm. The subjects were asked to run at 3 different speed of 2.0m/sec, 3.5m/sec, 5.0m/sec and their motions were videotaped with 4 S-VHS video cameras and 2 high speed video cameras and simultaneously measured with a force platform. The following results were obtained after analysing and comparing the variables. Minimum angle of each ball flex position were increased with the increment of running velocity and shoe sole thickness(P<0.05), but mid-sole hardness did not affect minimum ball flex angle. The position which minimum angle was shown as smallest was 'D'. Midsole hardness and sole thickness did not affect time to each ball flex minimum angle, total angular displacement of ball flex angle, and total angular displacement of torsion angle(P<0.05). The position which minimum angle was appeared to be earliest was similar at walking velocity, and E and F of midfoot region at running velocity. Total angular displacement of ball flex position tended to increase as shifted to heel. It was found that running velocity had effects on ball flex angle variables, but shoe sole thickness partially affected. It would be considered that running velocity made differences between analysis variables at walking and running when designing shoes. Also, it was regarded that shoes would be developed at separated region, because ball flex angle and position was shown to be different at toe and heel region. It is necessary that midsole hardness and thickness required to functional shoes be analyzed in the further study.

• 생명과학회지
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• 제21권9호
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• pp.1336-1345
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• 2011

본 연구에서는 국내외 실버화와 일반적인 운동화에 대한 1차 운동기능학적 분석을 통하여 노인에게 가장 적합한 신발을 정하고 2차 운동생리학적 실험을 통해 체지방률변화, 운동강도에 따른 대사량의 변화 그리고 에너지 소비량의 변화를 분석하였다. 본 연구의 대상으로는 특별한 질병을 가지고 있지 않은 남자 어른들 20명을 대상으로 하였으며, 평균나이는 $62.78{\pm}4.32$세, 신장은 $170.89{\pm}3.56cm$ 그리고 몸무게는 $75.12{\pm}8.76kg$이었다. 실험 전 실험에 대한 충분한 설명을 하고 동의서를 받은 후 데이터를 수집하였다. 본 연구를 위하여 운동 기능학적 실험과 운동 생리학적 실험을 수행하였으며, 본 연구결과 걷기나 달리기 시 최초 발 뒤꿈치 접촉 시 발이 회내(pronation)되는 정도와 최대 회내가 되는 정도를 알아 본 결과 걷기속도가 가장 빠르게 나온 B형의 신발이 회내값($-2.3{\pm}1.05^{\circ}$)이 가장 크게 나타났으며 일반걷기용 신발에서 가장 작은 값($-1.5{\pm}0.49^{\circ}$)을 보여주고 있다. 또한 노인들의 일상생활에서 착용하는 건강증진용 신발을 대상으로 운동 생리학적 부분을 살펴보면 체지방율의 변화는 모든 그룹에서 감소는 하였으나, 통계적으로 유의한 차이가 나타나지 않았는데, 이는 체지방율의 변화를 가져오기 위해서 일시적인 운동이 아닌 규칙적이고 장기적인 운동이 필요할 것으로 사료되어지며, 노인들이 건강증진용 기능화를 장기적으로 착용하여 운동할 경우 체 지방율에 긍정적인 영향을 미칠 것으로 사료되어진다.

• 한국운동역학회지
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• 제14권2호
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• pp.85-103
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• 2004

This study was conducted to determine what effects would the midsole hardness of running shoes have on shoe flex angle and maximum propulsive force. Furthermore, the relationship between the shoes flex angle and maximum propulsive force was elucidated in order to provide basic data for developing running shoes to improve sports performances and prevent injuries. The subjects employed in the study were 10 college students majoring in physical education who did not have lower limbs injuries for the last one year and whose running pattern was rearfoot strike pattern of normal foot. The shoes used in this study had 3different hardness, shore A 40(soft), 50(medium) and 60(hard). The subjects were asked to run at a speed of $4{\pm}0.08m/sec$, and their movements were videotaped with 2 S-VHS video-cameras and measured with a force platform. And the following results were obtained after analyzing and comparing the variables. 1. Although the minimum angle of shoes flex angle was estimated to appear at SFA4, it appeared at SFA2 except in those shoes with the hardness of 40. 2. The minimum angle of shoes flex angle was $145.1^{\circ}$ with barefoot. Among the shoes with different hardness, it was the smallest when the hardness was 50 at $149.9^{\circ}$. The time to the minimum angle was 70.7% of the total ground contact time. 3. Maximum propulsive force according to midsole hardness was the largest when the hardness was 50 at $1913.9{\pm}184.3N$. There was a low correlation between maximum propulsive force and shoes flex angle.

• 정보처리학회논문지D
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• 제10D권1호
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• pp.1-12
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• 2003

최근 이미지, 비디오와 같은 멀티미디어 데이터에 대한 효율적인 검색을 위해 많은 다차원 및 고차원 색인 구조들에 대한 연구가 활발히 진행되고 있다. 하지만 기존의 색인 구조의 연구 방향은 검색의 효율을 극대화 하는데 초점을 맞추어 왔으며 최근의 멀티미디어 데이터베이스나 데이터 마이닝 분야와 같은 다수 사용자 환경을 요구하는 환경에서는 부적합한 실정이다. 이에 본 논문에서는 기존의 제시된 차원이 증가하면서 급속하게 성능이 저하되는 문제를 특징 벡터의 시그니쳐를 구성하여 완화시킨 필터링에 기반한 고차원 색인 구조에 동시성 제어기법을 설계 및 구현하여 위스콘신 대학에서 개발한 지속성 객체 저장 시스템인 SHORE 하부저장 시스템과 밀결합 방식으로 통합하였다. 확장된 SHORE 하부저장 시스템은 고차원 데이터에 대한 효율적인 검색 뿐만 아니라 레코드 레벨의 색인 데이터에 대한 동시성 제어를 지원하며 시그니쳐 파일을 모두 메모리에 로딩하는 구조를 개선하여 페이지 레벨의 관리가 가능하다. 아울러 본 논문에서 제시한 확장된 SHOE 하부저장 시스템을 실제 응용 시스템에 적용하기 위해 플랫폼 독립적인 환경을 지원하는 자바 언어를 사용하여 미들웨어 구축 방안을 제시한다. 또한 구축된 미들웨어를 통해 쓰레드 별로 대표적인 내용기반 질의 형태인 포인트질의, 범위질의, k-최근접 질의에 대한 다수 사용자 환경에서의 성능 평가를 수행하였다.