• 대한물리의학회지
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• 제4권2호
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• pp.87-92
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• 2009

Objects：The purpose of this study is to investigate the values of foot pressure of the stance phase during a gait cycle in hemiplegic gait. Method：42 patients who had a stroke and 42 healthy adults were evaluated by the RSscan system to analyze the stance phase of hemiplegic gait. The stance phase was evaluated as plantar foor pressure. Results：1) Foot plantar pressure of toe area, affected side and less affected side showed low distribution of the plantar foot pressure which is lower than plantar foot pressure of normal adults(p<0.05). 2) Foot plantar pressure of metatarsal area, showed significantly differences among hemiplesic patient's affected side and less affected side and distribution of plantar foot pressure of normal adults(p<0.05). 3) Foot plantar pressure of heel area, hemiplesic patients' affected side and less affected side showed lower distribution of the plantar foot pressure than plantar foot pressure of normal adults(p<0.05). Conclusion：The results of this study suggest that not only affected side but also less affected side in hemiplegic patients showed significantly differences in distribution of the plantar foot pressure of normal adults.

• 전기의세계
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• 제18권6호
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• pp.23-32
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• 1969

The thesis has derived the formulas and computational algorithms useful for predicting and constraining the potential rises on the neutral line in 3-phase, 4-wire distribution line systems in the case of contact faults and single-line grounding faults. In addition it has suggested economically optimal designing conditions herewith of the distribution line systems in conduction with the potential restraining cost functions.

• Communications for Statistical Applications and Methods
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• 제19권1호
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• pp.169-175
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• 2012

The sensitivity of the performance measures such as the mean and the standard deviation of the queue length and the blocking probability with respect to the moments of the service time are numerically investigated. The service time distribution is fitted with phase type(PH) distribution by matching the first three moments of service time and the M/G/c retrial queue is approximated by the M/PH/c retrial queue. Approximations are compared with the simulation results.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2010년도 하계학술대회 논문집
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• pp.468-469
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• 2010

DSTATCOM(Distribution STATic COMpensator) is one of the custom power devices, and protects a distribution line from unbalanced and harmonic current caused by non-linear and unbalanced loads. Conventional researches use a LPF(Low Pass Filter) to eliminate ripple component at the calculation of compensation current. This paper proposes a calculation of compensation current using phase shift that can be a counterproposal of conventional methods using LPF.

• 한국정보통신학회논문지
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• 제20권10호
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• pp.1831-1836
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• 2016

본 논문에서는 차세대 위성통신 규격인 DVB-RCS2 기반 VSAT 단말 시스템의 송수신부 위상잡음 스펙트럼 분포 특성을 분석한다. VSAT 순방향 링크는 DVB-S2 ACM 기반 APSK 고차 전송모드를 사용하며, 역방향 링크는 DVB-RCS2 기반 PSK 및 QAM 계열의 고차 전송 모드를 사용한다. 고차 전송 모드를 사용함에 따라 위상잡음에 의한 영향이 나타나며, 위성전송시스템 신호발생부의 위상잡음 특성에 따라 전송 성능의 열화가 지배적으로 나타난다. 위성전송 환경에 따라 가변적으로 전송 데이터 율와 전송 모드를 가변하는 전송방식을 고려하여 요구 위상잡음 특성을 분석하고 차세대 VSAT 전송 파라미터를 수용하는 전송시스템 신호발생부의 위상잡음 특성을 제시한다.

• 열처리공학회지
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• 제7권4호
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• pp.270-276
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• 1994

The effects of thermomechanical and duplex aging treatment on precipitation behavior were investigated for the 8090 aluminium alloy by tensile test, hardness test, plane-strain fracture toughness test and electron microscope. Both pre-aging stretch and duplex aging with pre-aging stretch were effective to homogenize the distribution of S' phase in this alloys. The latter makes more homogeneous distribution of S' phase than that of the former, but the sizes of S' phase in both specimens are almost same. The size and distribution of 0' phase were not changed by thermomechanical or duplex aging treatment. The strength was increased by thermomechanical treatment, but the elongation was decreased. Duplex aging treatment couldn't change the strength and elongation. Pre-aging stretch and duplex aging with pre-aging stretch have same effect on the strength and elongation. The increase of strength by thermomechanical treatment in 8090 alumunium alloy was caused by homogeneously precipitated S' phase.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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• pp.471-474
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• 2006

The Mixer is apparatus that help precipitation or an inhomogeneous distribution of various phases to be mixed and that user makes necessary material mixing one or the other. Mainly the mixer which is used from chemical and food industry is very important system in engineering that mixes the material. The inside flow of the mixer under the actual states which put a basis in flow of the fluid is formed rotation of the impeller. The inside flow of impeller will be caused by various reasons change with shape of impeller, number of rotation, mixing material and flow pattern of free surface etc. Also mixer study depended in single-phase flow and experimental research. So the numerical analysis of flow mixing solid-fluid particle is simulated. It is become known, that the case where agitator inside working fluid includes the solid particle the sinkage reverse which the solid particle has decreases an agitation efficiency. From the research which it sees the hazard solid which examines the effect where the change of the sinkage territory which it follows agitation number of revolution and diameter of the particle goes mad to an agitator inside flow distribution - numerical analysis the inside flow distribution of liquid state with Eulerian Two-Phase Method.

• 한국전산구조공학회논문집
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• 제24권1호
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• pp.9-16
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• 2011

다상 재료는 상(phase) 분포 상태에 의해 그 특성이 다르기 때문에 상 분포에 따른 재료의 특성을 이해하는 것이 중요하다. 본 연구에서는 미세구조의 상 분포 특성을 묘사할 수 있는 확률 분포 함수를 사용하여 등방성/이방성 미세구조의 상분포 상태를 표현하는 방법을 살펴보았다. 다양한 상 분포를 가진 미세구조들에 유한요소해석 기법을 적용하여 미세구조의 역학적인 거동을 분석함으로서, 상 군집의 분포 상태에 따른 재료의 강도 및 특성의 변화를 살펴보았다. 이를 통해 상 군집의 위상에 의한 재료 강도의 영향 및 군집 크기가 커질수록 강도가 낮아지는 현상을 확인하였다.

• 공업화학
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• 제8권6호
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• pp.967-972
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• 1997

접촉분해경유(LCO)와 dimethylsulfoxide(DMSO)수용액의 평형추출로부터 얻어진 추출상을 원료로 사용한 역추출에 의해 추출상중의 방향족의 회수를 검토했다. 역추출 용매의 선정을 위해, Benzene, Toluene, m-Xylene(mX), n-Hexane(Hx)과 n-Octane(Ot)을 용매로 사용하여 추출상-용매간의 분배평형을 측정한 결과, 추출상중의 방향족의 회수면에서 Hx이 가장 적절한 용매이었다. 또, Hx을 용매로 사용하여 평형 역추출을 행해 방향족의 회수에 대한 조작인자의 영향을 검토했다. 방향족에 대한 분배계수는 용매/원료(추출상) 질량비(S/F)(S/F를 변화시켜 얻어진 추잔상 혹은 추출상중의 질량분율)에 관계없이 일정했으나 수율은 S/F가 증가함에 따라 증가했다. 조작온도는 방향족의 분배계수와 수율에 영향을 미치지 못했다. 나프탈렌류 성분(탄소수:10~12)간에는 탄소수가 많을수록 분배계수 및 수율이 컸다. 또한, 회분 교반조를 사용하여 역추출을 행해 방향족 성분의 물질이동 속도를 측정했다.

• 조명전기설비학회논문지
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• 제24권10호
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• pp.85-89
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• 2010

During a ground fault the maximum fault current and neutral to ground voltage will appear at the pole nearest to the fault. Distribution lines are consisted of three phase conductors, an overhead ground wire and a multi-grounded neutral line. In this paper phase to neutral faults were staged at the specified concrete pole along the distribution line and measured the ground fault current distribution in the ground fault current, three poles nearest to the fault point, overhead ground wire and neutral line. A effect by grounding resistance of poles of ground fault current in the 22.9[kV] multi-ground distribution system. by field tests.