• Journal of Chest Surgery
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• 제12권3호
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• pp.259-262
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• 1979

Alopecia is a minor complication following open heart surgery, but it is a cosmetic and psychotic problem to the patient. Especially the extensive long period of operation, prolonged mechanical ventilation and no change of patient head position during operative and recovery period may serve the localized scalp pressure effect, which causes postoperative alopecia. So, for prevention of the postoperative alopecia, adequate blood flow and pressure must be maintained with alternative change of head position during operative and recovery period. The author experienced one case of occipital alopecia following open heart surgery and reports with literature.

• 산업기술연구
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• 제27권A호
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• pp.3-7
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• 2007

There are many techniques to calculate the exact position of deep seated tunnel. Especially, tomography method has been used generally in present days. This method has been performed mainly by wave traveltime. Because of short interval of two measuring boreholes, it was very hard to interpret the exact tunnel position. To solve this problem, seismic amplitude method was tried to detect exact pososition of tunnel in this study.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -2
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• pp.608-611
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• 2000

We introduce Adaptive Fuzzy Impedance Controller for position and force control when robot contact with environment. Because Robot and environment was always effected by nonlinear conditions, it need to deal with parameter’s uncertainty. For solving this problem, it induced Fuzzy System in Impedance Control so fuzzy system is impedance’s stiffness gain. We apply adaptive fuzzy impedance controller in One-Link Robot System, it shows the good performance on desired position control and force control about contacting with arbitrarily environment.

• 한국군사과학기술학회지
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• 제5권2호
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• pp.159-168
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• 2002

In this paper, a study on the design of the transmitter-receiver of fuze sensor for discriminating target position is presented. We propose the algorithm for detecting target distance/direction through investigating the operational concept and principle of fuze sensor. Based on the algorithm, We design transmitter-receiver, calculate various design variables and estimate the performance of that one. The estimated result shows that the required performance of fuze sensor is satisfied. Further research on confirming the performance of proposed algorithm through encounter simulation test with real target and resolving problem will be continued.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2005년도 추계학술대회 논문집
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• pp.47-52
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• 2005

This paper describes how a relatively compensate the error of position by using low cost Inertial Measurement Unit (IMU) has been evaluated and compared with the well established method based on a Kalman Filter(KF). The compensation algorithm by using IMU have been applied to the problem of integrating information from an Inertial Navigation System (INS). The KF is to estimate and compensate the errors of an INS by using the integrated INS velocity and position. We verify the proposed algorithm by simulation results.

• 경영과학
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• 제30권1호
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• pp.15-24
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• 2013

We consider the single machine scheduling problem with a rate-modifying activity and time-dependent deterioration after the activity. The class of scheduling problems with rate-modifying activities and the class of scheduling problems with time-dependent processing times have been studied independently. However, the integration of these classes is motivated by human operators of tasks who has fatigue while carrying out the operation of a series of tasks. This situation is also applicable to machines that experience performance degradation over time due to mal-position or mal-alignment of jobs, abrasion of tools, and scraps of operations, etc. In this study, the integration of the two classes of scheduling problems is considered. We present a mathematical model to determine job-sequence and a position of a rate-modifying activity for the integration problem. Since the model is difficult to solve as the size of real problem being very large, we propose genetic algorithms. The performance of the algorithms are compared with optimal solutions with various problems.

• 한국산학기술학회논문지
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• 제17권6호
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• pp.89-97
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• 2016

본 논문은 포병진지 구축계획 문제의 효과적인 해결을 위해 해당 문제를 최적화 모형으로 형성하고, 현실규모 문제 해결을 위한 휴리스틱 알고리즘을 제시한다. 포병진지 구축계획은 공병부대의 지원 포병부대 결정과 공병 지원팀 편성, 편성된 공병 지원팀의 포병부대 지역 내 포병진지 구축일정을 수립하는 의사결정을 포함한다. 군에서는 포병진지 구축계획을 담당자의 경험적 지식을 바탕으로 수립한다. 본 논문에서는 공병부대의 포병진지 구축 일정계획 문제를 효과적으로 해결하기 위한 혼합정수계획 모형을 제안한다. 해당 모형의 목적은 공병 지원팀으로 구축이 요구되는 모든 포병진지를 구축 완료하는 데 걸리는 시간을 최소화하는 것이다. 또한, 현실규모 문제 해결을 위해 포병진지 구축계획 문제를 분할하여 해결하는 휴리스틱 알고리즘을 제안한다. 제한한 휴리스틱 알고리즘의 성능을 확인하기 위해 두 가지 실험을 실시한다. 제안한 휴리스틱 알고리즘은 소규모 문제를 이용한 최적해 근접성 실험에서 최적해 대비 평균 6.44% 오차범위의 해를 도출했으며, 포병진지 200개 이상인 문제를 이용한 현실규모 문제 해결 가능성 실험에서 문제를 해결하는 데 평균 79.8초가 소요되었다.

• East Asian mathematical journal
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• 제31권4호
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• pp.445-458
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• 2015

In this paper, we provide a geometrical solving method about the equiangular problem appeared in the solving process of the isoperimetric problem of polygon. In fact we deal with the following problem in the view of the productive thinking centered on the circle: Let B and G be fixed points, and let $\bar{AB}=\bar{AP_1}=\bar{DP_1}=\bar{DP_2}=\bar{FP_2}=\bar{FP_3}=\bar{HP_{n-1}}=\bar{HG}$. Then find the position of moving points $P_i(1{\leq}i{\leq}n)$ to maximize the sum of areas of the triangles that lie on the line segment $\bar{BG}$.

• 한국간호교육학회지
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• 제18권2호
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• pp.276-283
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• 2012

Purpose: This study was carried out to identify the effects of classroom lectures on adolescent nursing education in distance education. Method: The design of this study was a quasi-experimental research with nonequivalent control group, pretest-posttest design. The subjects of this study were 434 nurses in K open university. Data were collected from April to June, 2009 by the adolescent delinquency measurement scale and questionnaire for awareness of the issue in adolescent health education. Result: The both groups perceived the biggest problem as the lack of assigned education time in adolescent health education. After receiving education, the experimental group improved significantly more than the control group in recognition of adolescent problem behavior which is in interpersonal, intermaterial, order, drug, sex, position, alcohol/smoking delinquency and psychiatric problem. Conclusion: This adolescent nursing education is an effective education for nurses and could improve their recognition of adolescent problem behavior.

• Structural Engineering and Mechanics
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• 제64권4호
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• pp.505-513
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• 2017

In this paper, a receding contact problem for an elastic layer resting on a half plane is considered. The layer is pressed by two rectangular stamps placed symmetrically. It is assumed that the contact surfaces are frictionless and only compressive traction can be transmitted through the contact surfaces. In addition the effect of body forces is neglected. Firstly, the problem is solved analytically based on theory of elasticity. In this solution, the problem is reduced into a system of singular integral equations in which half contact length and contact pressures are unknowns using boundary conditions and integral transform techniques. This system is solved numerically using Gauss-Jacobi integral formulation. Secondly, two dimensional finite element analysis of the problem is carried out using ANSYS. The dimensionless quantities for the contact length and the contact pressures are calculated under various stamp size, stamp position and material properties using both solutions. The analytic results are verified by comparison with finite element results.