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이세한,최창민,이동건,이승후,송선해,표승현,홍성균,이규창 대한의용생체공학회 2018 Biomedical Engineering Letters (BMEL) Vol.8 No.3
Stroke survivors with gait disturbances may use ankle foot orthoses (AFOs). However, most AFOs come in one-piecestyles, which make it difficult for spasticity-affected stroke survivors to don. AFOs are also limited since they do notproperly prevent ankle joint for foot drop by itself. Therefore, the present study developed a novel hinged AFO by adding alocking device to a hinged joint. We then tested its feasibility in 9 hemiplegic stroke survivors by investigating temporal–spatial gait parameters using the GAITRite in the following 3 conditions: no AFO, traditional AFO, and novel hinged AFO. There was no significant difference in spatiotemporal gait parameters among the different conditions. There were greaterdecreases in gait velocity, cadence, step length, and stride length in the novel hinged AFO group than in the no AFO andtraditional AFO groups. This novel hinged AFO was developed to prevent foot drop. However, the AFO did not showsignificant differences in gait parameters because it consists of metal with extra weight and volume. Functionally, itprevented foot drop. It also improved convenience by its releasable design. Thus, further studies are needed to develop anAFO that improves gait and is convenient to use for hemiplegic stroke survivors.
이세한,YUNSEOP YU,안도열,HANJUNG KIM,황성우 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.III
A modeling of a nanowire field effect transistor (FET) considering Schottky barrier height (SBH) lowering is introduced. Because nanowire FETs inevitably involve a metal-semiconductor-metal (M-S-M) structure, they consist of two metal-semiconductor (M-S) contacts and one resistor in between them. Our model includes a thermionic field emission (TFE) mechanism under reverse-bias and a thermionic emission (TE) mechanism under forward bias. Our model can describe SBH lowering not only by drain-source bias but also by gate bias. The results simulated with our model reproduce the experimental results within a maximum error of 1 \%.
경사면을 주행하는 차륜형 역진자를 위한 선형행렬 부등식 기반 혼합 H2 /H∞ 상태피드백 제어기 설계
이세한,이상용 한국지능시스템학회 2010 한국지능시스템학회논문지 Vol.20 No.5
In this research an LMI based mixed H₂ /H∞ controller for a Wheeled Inverted Pendulum is designed and a numerical simulation of that is carried out. The Wheeled Inverted Pendulum is a kind of an inverted pendulum that has two equivalent points. To keep that the naturally unstable equivalent point, a controller should control the wheels persistently. Dynamic equations of the Wheeled Inverted Pendulum are derived with considering inclined road that is one of the representative road conditions. A Linear Matrix Inequality method is used to construct a controller that is able to stabilize the Wheeled Inverted Pendulum with considering the inclined road condition aggressively. Various numerical simulations show that the LMI based controller is doing well on not only flat road but also inclined road condition. 본 논문에서는 차륜형 역진자에 적용되는 LMI 제어기 설계와 그 수치 시뮬레이션이 수행되었다. 차륜형 역진자는 2개의 평형점을 갖고 있는 역진자의 일종이다. 불안정한 평형점에 대하여 평형을 유지하기 위하여 차륜형 역진자는 지속적으로 제어되어야 한다. 경사면을 고려하여 차륜형 역진자의 동역학 방정식이 유도되었다. 경사면을 적극적으로 고려하여 차륜형 역진자를 안정화 시킬 수 있는 제어기를 구성하는데 선형행렬부등식 기법이 적용되었다. LMI 기반 제어기가 평면과 경사면에 대해서 유효함을 보이기 위해서 다양한 수치 시뮬레이션이 수행되었다.
탈냉전기 미국의 군사작전 개념과 한국군 발전방향 연구-합동작전을 중심으로
이세한,Lee, Se-Han 대전대학교 군사연구원 2004 군사학연구 Vol.2 No.-
Science technique development expanded into, not only land, sea, and air operations but also those of airspace, and cyber battle spaces. It is generally accepted at this time that space centric operations currently cannot be effectively divided from air operations. However, science and technology advancements make it possible to integrate Army, Navy, Airforce, and Marine forces into effective operations as never before. The Republic of Korea Armed Forces needs to establish a more effective joint concept. The US military, considered by many experts as the most effective in the world, understands the necessity of joint operations and accordingly has highly developed its own concept of joint operations. The US joint operational concepts demonstrated their effectiveness during the Iraqi War by dominating the battlefield through effective use of all combat and non-combat power. Following the US Iraqi War experience, the US Department of Defense continued to enhance Joint Capability through the acceleration of US Military Transformation involving all components. The future national security of the Republic of Korea, faced with the peculiarity of communist threat in the form of North Korea, and the conflicting interest of four strong powers; the United States, China, Japan, and Russia, depends on small but strong armed forces employing all available combat power through effective National and Military Strategy, and considering domestic and international constraints. In order to succeed in future wars, military operations following joint operational concepts must effectively employ all available combat power in a timely manner. The Republic of Korea Armed Forces must establish a joint forces concept in order to integrate all available combat power during employment. Therefore we must establish military operations that develop the military structure and organization, doctrine, weapon systems, training and education of our armed forces based on the key concept of joint operations.