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Adhesion Tunable Bio-Inspired Dry Adhesives by Twisting
강오현,이성호,윤정환,이학,곽문규,이상룡 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.10
We report on a control method by twisting the adhesion property of a bio-inspired dry adhesive with mushroom-shaped micro structures. The fabricated artificial dry adhesive has a strong adhesive force in all directions; however, this adhesive is considerably strong to detach simply for reversible usages. This study proposes twisting a mushroom-shaped artificial dry adhesive for easy a detachment method that makes a pull-off force decrease from 14 N/cm2 to nearly 0. In addition, the optimal process parameters of the twisting detachment are studied by experimentally comparing the pull-off force, net torque, and required time depending on the thickness of the adhesive and angular velocity of twisting. Result indicates that thin adhesive (1.2 mm) and high angular velocity (0.0436 rad/s) provide a good detachment performance. For the feasible application of the proposed method, a glass transportation robot was used for demonstration and a glass substrate was transported several times.
강오현(Ou-Hyun Kang),박명섭(Myong-Sop Pak) 한국관세학회 2011 관세학회지 Vol.12 No.4
The paper aims to analyse the implications of the origin certification system under the Republic of Korea-United States Free Trade Agreement (also known as KORUS FTA). The agreement was passed by the United States on October 12, 2011 with the Senate and the House. It was ratified by the National Assembly of South Korea on November 22, 2011. The preferential rules of origin in the FTA are the key issue with respect to eligibility for trade benefits. FTA allows each party’s customs administration various methods for determining if a good certified as originating qualifies by meeting the FTA rules of origin requirements. KORUS FTA is different from other agreements on verification methods, textile and clothing verification. 2010 survey of domestic enterprises, the interest of domestic companies for FTA is relatively lack, and appears to be very incomplete in preparation for the origin verification of domestic and foreign customs. The South Korea’s total trade with FTA concluding countries is nothing more than a 14 percent, and seems to be not conducted a strong regulatory for rules of origin among already entered into force of the FTA. Until now, however, unlike the FTA entered into force if ratified the FTA with the United States, verification requests originating from the United States is expected to surge in law.
우리나라 보험산업의 생산성 : 교육과 무역자유화의 영향분석
나호수,김태형,강오현 한국무역보험학회 2011 무역금융보험연구 Vol.12 No.2
본 연구에서는 한국의 보험산업에 대하여 생산성을 측정하여 비교하고 시간적 추세를 살펴보았다. 이와 함께 보험산업의 생산성변화에 교육 또는 인적자본의 축적 그리고 무역자유화의 진전이 영향을 미치고 있는지를 파악해 보고자 하였다. 실증결과 1. 생명보험산업의 상대적 효율성이 손해보험산업의 상대적 효율성보다 훨씬 높게 나타났고 2. 우리나라 보험산업의 효율성은 생명보험산업에서는 상승되는 추세를 보여 왔으나 손해보험산업에서는 하락추세를 보여 왔으며 3. 생명보험산업에서는 규모의 효율성이 거의 같은 수준으로 유지되고 있으나 손해보험산업에서는 규모의 효율성이 증대되었고 4. 생명보험산업은 1990년대에는 규모에 대한 수익증가를 보이다가 2000년대에는 규모에 대한 수익감소 또는 불변을 보여주었고 손해보험산업에서는 1990년대나 2000년대 모두 규모에 대한 수익증가를 보여주었고 5. 보험산업의 생산성의 변화는 교육에 크게 영향 받아 왔고, 무역자유화의 진전에도 어느 정도 영향을 받아왔다는 점 등이 밝혀졌다.
이상룡,허근섭,강오현,이춘영,Lee, Sang-Ryong,Heo, Geun-Sub,Kang, Oh-Hyun,Lee, Choon-Young 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.3
In this paper, we proposed a technique to recognize three states in stance phase of gait cycle. Walking assistive devices are used to help the elderly people walk or to monitor walking behavior of the disabled persons. For the effective assistance, they adopt an intelligent sensor system to understand user's current state in walking. There are three states in stance phase; Loading Response, Midstance, and Terminal Stance. We developed a foot pressure sensor using 24 FSRs (Force Sensing/Sensitive Resistors). The foot pressure patterns were integrated through the interpolation of FSR cell array. The pressure patterns were processed to get the trajectories of COM (Center of Mass). Using the trajectories of COM of foot pressure, we can recognize the three states of stance phase. The experimental results show the effective recognition of stance phase and the possibility of usage on the walking assistive device for better control and/or foot pressure monitoring.
허근섭(Geun Sub Heo),강오현(Oh Hyun Kang),이상룡(Sang Ryong Lee),이춘영(Choon-Young Lee) 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.6
In this paper, we designed and tested an ankle joint mechanism for a gait rehabilitation robot. Gait rehabilitation programs are designed to improve the natural leg motion of patients who have lost their walking capabilities by accident or disease. Strengthening the muscles of the lower-limbs and stimulation of the nervous system corresponding to walking helps patients to walk again using gait assistive devices. It is an obvious requirement that the rehabilitation system’s motion should be similar to and as natural as the normal gait. However, the system being used for gait rehabilitation does not pay much attention to ankle joints, which play an important role in correct walking as the motion of the ankle should reflect the movement of the center of gravity (COG) of the body. Consequently, we have designed an ankle mechanism that ensures the safety of the patient as well as efficient gait training. Also, even patients with low leg muscle strength are able to operate the ankle joint due to the direct-drive mechanism without a reducer. This safety feature prevents any possible adverse load on the human ankle. The additional degree of freedom for the roll motion achieves a gait pattern which is similar to the normal gait and with a greater degree of comfort.