• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.3
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• pp.734-741
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• 2008

The modern people effort to lead good life. Specially, the patients which prevention of a disease only is cure from this diabetes patient, the old and weak, the hospitals needing a treatment through exercises, and receive medical treatment in houses cure exercise according to exercise prescription. These papers developed a Ubiquitous Care Management system based on Zigbee. This is a system supporting so as accumulation manages the exercise history information that occurred when get exercises prescription, and exercise systematically, and to do preventive of a disease. Can confirm own exercise history and health information through web pages, and this system notifies contents about an exercise treatment to patients as use a cellular phone.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.870-873
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• 2007

본 논문에서는 지그비 기반의 유비쿼터스 케어 관리(U-Care Management) 시스템을 설계하였다. 이 시스템은 운동처방을 받아 체계적으로 운동할 때 발생하는 운동 이력 정보를 누적 관리하여 질병을 예방하도록 지원한다. 이 시스템은 자신의 운동 이력 및 건강 정보를 웹페이지를 통하여 확인할 수 있을 뿐만 아니라, 휴대폰을 이용하여 환자들에게 운동 치료에 관한 내용을 통보하여 준다.

• Journal of the Korea institute for structural maintenance and inspection
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• v.23 no.7
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• pp.137-144
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• 2019

For the structures near the seismogenic fault, the evaluation of seismic performance against near-fault ground motions is important as well as for design ground motions. In this study, characteristics of seismic behaviors and seismic performance of the pile-bent bridge constructed on the thick soft soil site with various weak soil layers were analyzed. The input ground motions were synthesized by the directivity pulse parameters for intra-plate regions. The ground motion acceleration histories of each layer were obtained by one-dimensional site response analysis. Each soil layer was modeled by equivalent linear springs, and multi-support excitations with different input ground motions at each soil spring were applied for nonlinear seismic analyses. The analysis result by the near-fault ground motions and ground motions matched to design spectra were compared. In case of the near fault ground motion input, the bridge behaved within the elastic range but the location of the maximum moment occurred was different from the result of design ground motion input.

• Journal of the Earthquake Engineering Society of Korea
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• v.4 no.2
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• pp.37-46
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• 2000

본 논문에서는 부지특성을 고려한 설계지반운동의 산정방법을 연구하였으며 그 해석결과를 지반 구조물의 내진설계에 적용하는 방법을 제안하였다 지진응답 해석시 사용되는 설계응답스펙트럼과 설계시간 이력등의 입력운동의 통제점 위치가 지반구조물 내진설동 지층내 암반운동 그리고 노두운동을 사용하는 방법으로 나눌 수 있고 이에 따라 작용 설계지진운동이 변화하므로 지반구조물의 경계조건에 적합한 방법을 사용하여야 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.10a
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• pp.807-810
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• 1995

The effects of weae particles on the friiction and wear behavior of metals in dry sliding conditions are presented. The tribological test were performed using pure metal specimens which were selected based on their degrees of compatibility and hardness ratio. Friction and wear experiments were conducted using both pin-on-disk and reciprocating pin-on-plate type tribotesters to investigate the effect of motion history. Experimental results show that in the case of dry sliding the frictional behavior observed during pin-on-disk test differed form that of pin-on-reciprocator test for the given set of material pairs. The friction coefficient and wear rate were found to be higher for the pin-on-disk tests. It is suspected that the sliding motion of the pin affects the wear particle dynamics, which in turn influences the frictional behavior. The effect of material pair properties seemed to be relatively smaller than that of wear particles. The results of this paper is expected to aid in the design of mechanical systems for best tribological performance.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.32 no.6
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• pp.425-434
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• 2019

It is important to ensure the seismic safety of pile-bent bridges constructed in areas with thick soft ground consisting of various soil layers against seismic motion in these layers. In this study, several synthetic seismic waves that are compatible with the seismic design spectrum for rock sites were generated, and the ground acceleration history of each soil layer was obtained based on ground analyses. Using these acceleration histories, each soil layer was modeled using equivalent linear springs, and multi-support excitation analyses were performed using the input motion obtained at each soil layer. Due to the nonlinear behavior of the soft soil layers, the intensity of the input ground motion was not amplified, which resulted in the elastic behavior of the bridge. In addition, inputting the acceleration history obtained from a particular layer simultaneously into all the ground springs reduced the response. Therefore, the seismic performance of this type of bridge might be overestimated if multi-excitation analysis is not performed.

• Water for future
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• v.52 no.5
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• pp.36-41
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• 2019

• Journal of the Korean Magnetics Society
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• v.15 no.1
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• pp.12-16
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• 2005

The $Fe_{87}Zr_{7}B_{6}$ amorphous alloy after neutron irradiation are studied hysteresis loop and complex permeability measurements. The total integration fluence of fast neutrons is varied from $1.92{\times}10^{14}$ to $4.85{\times}10^{16}n_{f1}cm^{-2}$. After neutron irradiation, the imaginary part of complex permeability in low frequency region decreased due to the decrease of wall motion, but the permeability in high frequency region increased due to the enhancement of rotational magnetization. The measurement of hysteresis loop showed the increase of magnetic softness, related to rotational magnetization, but saturation magnetization was decreased in neutron irradiation sample.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.754-756
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• 2013

건강, 운동에 관한 관심이 고조되고 레저를 즐기는 사용자층이 확대되어 감에 따라 다양한 종류의 레저형 시뮬레이터에 대한 개발이 이루어지고 있다. 그러나 단순 운동을 위한 스포츠 시뮬레이터는 흥미를 반감시켜 지속적인 운동에 대한 저해하는 요소가 된다. 본 논문에서는 이런 시뮬레이터의 한계를 극복하기 위해 다양한 콘텐츠를 접목시킨 스포테인먼트형 자전거를 제안한다. 이를 위해 개인 신체 정보를 입력을 통해 프로그램 추천 및 이력관리가 가능하고 흥미요소인 게임, 음악 등을 동시에 즐기면서 운동을 할 수 있는 자전거 시뮬레이터 UXBike 시스템 개발한다. 이는 보편화된 운동 레저 시뮬레이터와 콘텐츠의 융합을 통해 사용자의 몰입도 향상 및 지속적인 관심을 갖게 하는 계기가 될것이라 판단된다.

• Journal of the Earthquake Engineering Society of Korea
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• v.12 no.1
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• pp.11-20
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• 2008

In probabilistic seismic analysis of nonlinear structural system, dynamic analysis is performed to obtain the distribution of the response estimate using input ground motion time histories which correspond to a given seismic hazard level. This study investigates the differences in the distribution of the responses and the failure probability according to input ground motion models. Two types of input ground motion models are considered: real earthquake records scaled to specified intensity level and artificial input ground motion fitted to design response spectrum. Simulation results fir a nonlinear SDOF system demonstrate that the spectrum matched input ground motion produces larger failure probability than those of scaled input ground motion due to biased responses. Such tendency is more remarkable in the site of soft soil conditions. Analysis results show that such difference of failure probability is due to the conservative estimation of design response spectrum in the range of long period of ground motion.