• 한국정밀공학회지
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• 제26권6호
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• pp.106-113
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• 2009

A 6-DOF precision stage was developed based on parallel kinematics structure with flexure hinges to eliminate backlash, stick-slip and friction and to minimize parasitic motion coupled with motions in the other-axis directions. For the stage, lever linkage mechanism was devised to reduce the height of system for the enhancement of horizontal stiffness. Frequency response comparison between experimental results and mathematical model extracted from dynamics of the stage was performed to identify the system parameters such as spring constants and damping coefficients of actuation modules, which cannot be calculated accurately by analytic methods owing to their complicated structures. This newly developed precision stage and its identified model will be very useful for precision positioning and control because of its high accuracy and non-coupled movement.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 추계학술대회 논문집
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• pp.601-607
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• 1998

This paper presents the efficient 2-D linear brake analysis model which can compensate the lateral leakage flux by changingng the airgap length and magneto-motive force(MMF). The linkage flux of the 2-D analysis is larger than that of 3-D analysis. This is caused by the assumption in 2-D analysis that geometric and physical values are constant along the perpendicular direction(z) to the analysis region. The equivalent MMF have been calculated from the linkage flux difference between the 2-D and 3-D analyses which are performed at zero velocity. The performances of the linear brake have been analyzed effectively by using the compensated 2-D models without using 3-D FEM.

• 한국융합학회논문지
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• 제7권6호
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• pp.259-266
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• 2016

본 연구는 지역사회에서 노인들을 위한 노인보호체계 구축의 실현가능성을 탐색하고, 연계모형과 실천전략을 모색하고자 하는데 목적이 있다. 우리나라는 고령화가 진행되면서 노인들의 다양한 욕구(여가, 주거, 취업 등)가 증가됨으로 지역사회에서 노인들에게 알맞은 상담과 지원프로그램을 제공할 수 있도록 포괄적인 노인보호체계를 구축할 필요성이 있다. 이에 본 연구에서는 노인보호체계의 연계모형을 설정하고, 이를 실천하기 위한 2가지의 방안을 제시하였다. 첫째, 지역사회의 노인보호체계를 조직의 형성에 초점두고 그 실천과정을 조직화단계, 실천활동단계, 확대조직화단계의 3단계로 구분하여 시행하는 것이 바람직 한 것으로 제시하였다. 둘째, 노인보호체계의 지역사회조직화 모형을 적용과 노인장기요양보험의 안정적 운영을 위해서는 케어매니저, 요양보호사 등과 같은 중심적 역할을 수행할 수 있는 장기요양 전문인력의 활용이 필요하다는 것이다. 그 외에 지역사회복지협의체와 민간네트워크로 사회복지협의회가 구성, 관련법조항의 신설, 케어매니저의 교육 등의 정립이 마련되어야 한다. 따라서, 본 연구를 통해 기초적인 자료를 마련하고, 노인보호체계에 대한 다각적인 전략과 방안을 마련하고 단계적으로 발전전략을 구사하여 추진해 나가야 할 것이다.

• 대한전기학회논문지
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• 제32권11호
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• pp.379-386
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• 1983

In this paper,the more accurate and simple synchronous machine model is derived by parameter modification method. At first, the flux linkage state space model is composed by redefining the parameters of synchronous machine and considering the saturation effect approximately. After that, this modified model is apply to the power system model and the effects of power system stability is analyzed by this model's characteristics in fault condition. As the result, the modified synchronous machine model shows more accurate and simple than the privious one.

• Asian-Australasian Journal of Animal Sciences
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• 제15권9호
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• pp.1250-1256
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• 2002

A novel fine-mapping method exploiting linkage disequilibrium (LD) was applied to better refine the quantitative trait loci (QTL) positions for milk production traits on bovine chromosome 14 in the pedigree comprising 22 paternal half-sib families of a Black-and-White Holstein-Friesian grand-daughter design in the Netherlands for a total of 1,034 sons. The chromosome map was constructed with the 31 genetic markers spanning 90 Kosambi cM with the average inter-marker distance of 3.5 cM. The linkage analyses, in which the effects of sire QTL alleles were assumed random and the random factor of the QTL allelic effects was incorporated into the Animal Model, found the QTL for milk, fat, and protein yield and fat and protein % with the Lod scores of 10.9, 2.3, 6.0, 25.4 and 3.2, respectively. The joint analyses including LD information by use of multi-marker haplotypes highly increased the evidence of the QTL (Lod scores were 25.1, 20.9, 11.0, 85.7 and 17.4 for the corresponding traits, respectively). The joint analyses including DGAT markers in the defined haplotypes again increased the QTL evidence and the most likely QTL positions for the five traits coincided with the position of the DGAT gene, supporting the hypothesis of the direct causal involvement of the DGAT gene. This study strongly indicates that the exploitation of LD information will allow additional gains of power and precision in finding and localising QTL of interest in livestock species, on the condition of high marker density around the QTL region.

• 한국물환경학회지
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• 제27권2호
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• pp.147-158
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• 2011

This study analyzed the linkage characteristics between road runoff and the nearest streams in mountain regions using a discriminant analysis. The road-to-stream linkage is an important characteristic to evaluate whether the contaminant on road surface is transported directly into the nearby channel system. This study evaluated a total of 51 drainage outlets of mountain roads near the Soyanggang Dam. The linkage between road and stream, slope and width of road, and other information necessary for the discriminant analysis have been collected by in situ investigation and by analyzing the Digital Elevation Model. Finally, as independent variables in the discriminant analysis, the contributing road representing the road characteristics (similar to the runoff from the road drainage outlet) and the distance and slope of the connecting channel between road and nearest stream were selected. Among these three, the distance was found to have the highest discriminant power, the contributing road the lowest. Using the discriminant function derived, 40 out of 51 cases (78.4%) were correctly discriminated and the remaining 11 cases (21.6%) were wrongly discriminated. Reasons of wrongly discriminated cases were mainly due to change in drainage outlet direction, excessive runoff, change in road-to-stream path, etc. This result also indicates that the road-to-stream linkage can be introduced or prohibited by exactly the same way.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 춘계학술대회 논문집
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• pp.502-503
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• 2014

• 한국소음진동공학회논문집
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• 제18권4호
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• pp.465-472
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• 2008

An automotive windshield wiper system is modeled mainly for vibration analysis purpose. The model is composed of solid links, ideal joints, imperfect joints to simulate unavoidable manufacturing defects and bushings having stiffness, contact between a wiper blade and a wind screen glass, friction, a spring and an actuator. Main stream of wiper dynamics analysis has been obtaining a closed form of system of equations using Newton's or Lagrange's formula and doing a numerical simulation study to understand and predict the behavior of it. However, the modeling process is complex since a wiper system is of multibody and a contact problem occurs. When imperfection, such as dead zone of a joint and stiffness of a rubber bushing, should be included, the added complexity makes the modeling difficult. Since the imperfection is understood as main cause of problematic vibration, the dynamics model of a wiper system aiming vibration analysis should include such unavoidable manufacturing defects in the model. An open form of dynamic model of a automotive windshield wiper system with imperfect joints using a commercial software is obtained and a simulation analyssis is conducted for vibration reduction study.

• Spatial Information Research
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• 제21권5호
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• pp.73-82
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• 2013

최근 국내외적으로 실내공간에 대한 관심이 높아지면서, 실내공간정보 구축 및 서비스에 관한 다양한 연구가 이루어지고 있다. 실내공간 정보를 구축함에 있어서 BIM(Building Information Modeling) 자료는 매우 유용하다. 이에, BIM 자료를 GIS에서 활용하기 위한 다양한 연구가 진행되고 있다. BIM 자료를 GIS에서 활용하기 위해서는 실내공간정보 구축을 위한 변환기술과 자료 가시화 기술이 반드시 필요하다. 기존 연구들이 대부분 실내공간 정보 구축을 위한 변환에 집중되어 있으며, BIM을 기반으로 구축된 공간정보들의 가시화에 관한 연구는 거의 이루어지지 않았다. 이에 본 연구에서는 BIM과 GIS 연계를 위하여 BIM 자료기반으로 실내 공간 자료를 구축했을 때, 실내 시설물 관리 시스템에 적용할 수 있는 실내공간 세밀도(LOD:Level of Detail) 모델을 제시하였다.

• 한국농공학회논문집
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• 제63권2호
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• pp.1-10
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• 2021

Agricultural reservoirs have a great influence on the water circulation in the watershed. It is necessary to evaluate the impact on water circulation by the agricultural reservoir. Therefore, in this study, we simulated the agricultural watershed through linkage of Hydrological Simulation Program Fortran (HSPF) and Module-based hydrologic Analysis for Agricultural watershed (MASA) and evaluated the contribution of the agricultural reservoir to water circulation by watershed water circulation index. As a result of simulating the Idong reservoir watershed through the HSPF-MASA linkage model, the model performance during the validation period was R2 0.74 upstream, 0.78 downstream, and 0.76 reservoir water level, respectively. To evaluate the contribution of agricultural reservoirs, three scenarios (baseline, present state, and present state without reservoir) were simulated, and the water balance differences for each scenario were analyzed. In the evaluation through the agricultural water circulation rate in the watershed, it was found that the water circulation rate increased by 1.1%, and the direct flow rate decreased by 13.6 mm due to the agricultural reservoir. In the evaluation through the Budyko curve, the evaporation index increased by 0.01. Agricultural reservoirs reduce direct runoff and increase evapotranspiration, which has a positive effect on the water circulation.