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RISS 인기검색어
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- 저자 : 유봉조(Bong-Jo Ryu) (검색결과 21 건)
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유봉조(Bong-Jo Ryu),김영식(Youngshik Kim),구경완(Kyung-Wan Koo) 한국디지털콘텐츠학회 2018 한국디지털콘텐츠학회논문지 Vol.19 No.4
Evaluation of clinical usefulness of current perception threshold test and vibration sense perception threshold test in diagnosing the diabetic poly-neuropathy patients is one of the diagnosis methods for diabetic poly-neuropathy. Up to the present, some diagnostic methods were used for diabetic poly neuropathy patients. For example, there are neuropathy impairment score test of lower limbs, nerve conduction test, cooling detection threshold test, heat-pain threshold test and so on. However, most of the above tests require very expensive cost and take a lot of time in test. In this paper, a new apparatus estimating vibration sense ability is introduced. For this purpose, the VCM(voice coil motor) stimulating patient’s peripheral nerve and current amplifier were manufactured. Also, softwares sensing and driving the vibration detection threshold test in order to measure the quantitative vibration sensory levels in diabetic poly-neuropathy patients were developed.
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유봉조(Bong-Jo Ryu),김영식(Youngshik Kim),오부진(Bu-Jin Oh),신부현(Buhyun Shin) 한국디지털콘텐츠학회 2018 한국디지털콘텐츠학회논문지 Vol.19 No.11
This paper deals with the temperature and fluid analysis for chips and boards of brake control units of an unmanned aerial vehicle which is widely used in the fields of machinery, aerospace and military fields. It is important to ensure reliability of such brake control units since its operation should be kept with a precision work. The temperature of the environment where the brake controller units are used is about -25℃-50°C(248°K-323°K). Heat generated in the brake control units should be maintained within certain threshold levels,(-25°C-95°C(248°K-368°K) to ensure reliability. Therefore, the study of the temperature and flow characteristics in the brake control units is required. In the paper, commercial software Solid-Works Flow Simulation was used for the numerical simulations. The purpose of the study is to design the brake control units safely analyzing the temperature and flow characteristics inside of the brake control units composed of chips and boards.
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유봉조(Bong-Jo Ryu),오부진(Bu-Jin Oh),김영식(Youngshik Kim) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.2
능동 파괴 방호 구동제어기는 기계, 항공 및 군사 분야 등에서 사용될 수 있는 제어기로서, 상대의 비행물체를 능동제어를 통해 추적 타격하는데 사용된다. 구동제어기를 이용하여 목표지점까지의 정밀도를 갖고 동작이 유지되어야 하기 때문에, 이에 대한 신뢰성 확보가 대단히 중요하다. 이러한 구동제어기가 사용되는 주위 환경의 온도는 약 -32℃∼50℃(241 °K∼358 °K)이다. 신뢰성을 갖기 위해 구동제어기에서 중요시 간주되는 문제 중의 하나는 구동제어기 내의 열 발생이 어느 한계수준(85℃ (358 °K )이하로 유지되어야 정밀도와 신뢰성을 확보할 수 있다는 점이다. 따라서 구동제어기 내의 열 유동특성에 대한 연구와 분석이 필요하게 된다. 본 논문의 수치시뮬레이션을 위해 저 레이놀드 수 κ-ϵ 난류모델과 비압축성 점성유동을 가정하였고, 상용 소프트웨어인 Solid-Works Flow Simulation을 사용하였다. 본 논문의 목적은 각종 칩이나 보드 등을 갖는 구동제어기 내부의 열 유동 특성을 해석하여 구동제어기의 안전한 설계를 하는데 있다. 해석으로부터, 보드들과 칩들의 온도분포가 어떤 한계 수준 이내에 있음을 보여준다. A driving controller for active destruction protections can be applied to machinery, aerospace and military fields. In particular, this controller can be used to track and attack enemy flying objects through the active control. It is important to ensure reliability of the driving controller since its operation should be kept with precision to the target point. The temperature of the environment where the driving controller is used is about -32 C ~ 50 C (241~323 ). Heat generated in the driving controller should be maintained below a certain threshold (85 C (358 )) to ensure reliability; therefore, the study and analysis of the heat flow characteristics in the driving controller are required. In this research, commercial software Solid-Works Flow Simulation was used for the numerical simulation assuming a low Reynolds number turbulence model and an incompressible viscous flow. The goal of this paper is to design the driving controller safely by analyzing the characteristics of the heat flow inside of the controller composed of chips or boards. Our analysis shows temperature distributions for boards and chips below a certain threshold.
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유봉조(Bong-Jo Ryu),김영식(Youngshik Kim),신부현(Buhyun Shin),구경완(Kyung-Wan Koo) 한국디지털콘텐츠학회 2018 한국디지털콘텐츠학회논문지 Vol.19 No.10
Recently, bicycle parking equipments are widely used in most of developed countries, such as France, Japan and so on. However, most of private or public bicycle rental service stations having conventional bicycle depositories have many risk of being lost and stolen. In this paper, an automated bicycle parking and monitoring system based on the network is developed to improve the drawbacks of the conventional bicycle parking system. For this purpose, a remote parking control and monitoring system is first proposed. kinematic design and development of bicycle locking equipment for anti-theft and safety are then discussed. Lastly, parking controllers are also presented.
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김인우(Kim, In-Woo),유봉조(Ryu, Bong-Jo),김영식(Kim, Young-Shik) 한국산학기술학회 2015 한국산학기술학회논문지 Vol.16 No.12
기계, 건축, 토목공학 분야 등에는 불균일 단면을 갖는 보 형태의 구조물들이 널리 사용되고 있다. 본 논문은 양단이 단순 지지된 보 구조물들의 동특성과 진동에 대한 문제를 다루며, 국부좌표를 사용한 지배방정식이 유도된다. 갤러킨의 모드 합 방법으로 해가 가정되고, 고유진동수를 구하는 행렬식을 푸는 데는 이분법을 적용하였다. 유한요소법이 단지 기하학적 경계조건만을 만족시키는 허용함수를 사용하는 반면, 본 논문에서는 갤러킨의 모드합 방법을 적용하여, 지배방정식과 경계조 건을 모두 만족하는 고유함수를 사용하였다. 계의 동특성을 알기위해, 네 종류의 불균일 단면을 갖는 단순 지지 보에 대해 모달 해석과 시험이 수행되었으며, 해석 결과는 실험 결과와 근사한 일치를 나타내었다. Beam-type structures with non-uniform cross sections are widely used in mechanical, architectural, and civil engineering fields. This paper deals with dynamic characteristics and vibration problems. Governing equations are first derived by using local coordinates. Their solutions are then assumed by using Galerkin's mode summation method. Bisection method is also applied in solving the determinant of the matrix which can provide natural frequencies. Whereas finite element methods adopt admissible functions satisfying only geometric boundary condition, in this study we apply Galerkin's mode summation method which uses eigen-functions satisfying both governing equations and boundary conditions. Modal analysis and experimental tests are finally performed using simply-supported beams with four different non-uniform cross-sections. Our analytical results then show good agreement with experimental ones.
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