• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.1177-1180
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• 1996

In this paper, we propose an algorithm that realizes cooperative behavior by construction of autonomous mobile robot system. Each robot is able to sense other robots and obstacles, and it has the rule of behavior to achieve the goal of the system. In this paper, to improve performance of the whole system, we use Genetic Programming based on Natural Selection. Genetic Programming's chromosome is a program of tree structure and it's major operators are crossover and mutation. We verify the effectiveness of the proposed scheme from the several examples.

• 산업융합연구
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• 제14권1호
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• pp.27-37
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• 2016

I have done a case study on organization level based-organizational behavior textbooks published in Korea and USA. The objects are 'organizational behavior' by Su Yong Jung and 'organizational behavior' by Im Chang Hee in Korea, and 'organizational behavior' by Schermerhorn, Osborn, Uhl-Bien, & Hunt and 'organizational behavior' by Robbins, & Judge. The goal of this study is to identify the differences of the perspectives on the organization level based-organizational behavior between Korean and American textbooks. This research finding shows that it is valid to classify organizational behavior into such categories as organizational structure, organizational culture, and organizational change in the Korean textbooks for the better future study.

• 산업기술연구
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• 제32권A호
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• pp.79-86
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• 2012

In this paper, centrifuge model tests and numerical analysis on the breakwater structure were performed to investigate the stability and behavior of breakwater in field. In centrifuge model tests, construction sequence of breakwater structure such as preparation of weathered rock and sand deposit, construction of D.C.M, rubble mound with crushed stones and installment of breakwater structure was reconstructed like field condition and the behavior of ground settlement and breakwater displacement during stage of construction was observed during tests. For the final stage of simulating the horizontal movement of breakwater due to wave force, horizontal load was applied by horizontal loading apparatus being specially designed so that horizontal displacement of structure could be observed. Numerical analysis were also carried out and its results were compared with test results to assess the property of centrifuge model tests with respect to the behavior of structure as well as ground.

• Ocean Systems Engineering
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• 제3권1호
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• pp.35-53
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• 2013

In this study, a hybrid floating structure with cylinder was introduced to reduce the hydrodynamic motions of the pontoon type. The hybrid floating structure is composed of cylinders and semi-opened side sections to penetrate the wave impact energy. In order to exactly investigate the hydrodynamic motions and structural behavior of the hybrid floating structure under the wave loadings, integrated analysis of hydrodynamic and structural behavior were carried out on the hybrid floating structure. Firstly, the hydrodynamic analyses were performed on the hybrid and pontoon models. Then, the wave-induced hydrodynamic pressures resulting from hydrodynamic analysis were directly mapped to the structural analysis model. And, finally, the structural analyses were carried out on the hybrid and pontoon models. As a result of this study, it was learned that the hybrid model of this study was showed to have more favorable hydrodynamic motions than the pontoon model. The surge motion was indicated even smaller motion at all over wave periods from 4.0 to 10.0 sec, and the heave and pitch motions indicated smaller motions beyond its wave period of 6.5 sec. However, the hybrid model was shown more unfavorable structural behavior than the pontoon model. High concentrated stress occurred at the bottom slab of the bow and stern part where the cylinder wall was connected to the bottom slab. Also, the hybrid model behaved with the elastic body motion due to weak stiffness of floating body and caused a large stress variation at the pure slab section between the cylinder walls. Hence, in order to overcome these problems, some alternatives which could be easily obtained from the simple modification of structural details were proposed.

• 한국공간구조학회논문집
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• 제8권2호
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• pp.73-84
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• 2008

지진에 의한 구조물의 응답을 저감시키기 위하여 내진, 면진, 제진 등 다양한 장치가 사용되고 있으며 그 중에서 면진장치는 구조물로 전달되는 지진에너지를 최소화하기 위한 시스템으로 그 주된 목적은 구조물의 주기를 길게 만들어 지진파의 탁월주기를 벗어나게 하는 것이다. 본 연구에서는 대공간구조물의 기본적인 동적특성을 가지고 있으며 동시에 가장 간단한 구조이기도 한 아치에 납-고무면진장치와 마찰진자면진장치를 적용하여 지진거동을 분석하였다. 대공간구조물의 지진거동은 일반적인 골조구조물의 지진거동과 달리 수평지진에 의하여 수직방향으로 큰 지진응답이 나타나고 있다. 면진장치를 대공간 구조물에 적용할 경우에 수평지진하중에 의하여 수평방향 지진응답이 저감되는 것은 물론 면진장치의 수직강성으로 인하여 수직응답도 현저하게 저감되는 것을 알 수 있었다.

• Geomechanics and Engineering
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• 제34권6호
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• pp.649-664
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• 2023

Structural inertial interaction is a representative the effect of dynamic soil-foundation-structure interaction (SFSI), which leads to a relative displacement between soil and foundation, period lengthening, and damping increasing phenomena. However, for a system with a significantly heavy foundation, the dynamic inertia of the foundation influences and interacts with the structural seismic response. The structure-to-foundation mass ratio (MR) quantifies the distribution of mass between the structure and foundation for a structure on a shallow foundation. Although both systems exhibit the same vertical factor of safety (FS_v), the MR and corresponding seismic responses attributed to the structure and foundation masses may differ. This study explored the influence of MR on the permanent deformation and seismic response of soil-foundation-structure system considering SFSI via numerical simulations. Given that numerous dimensionless parameters of SFSI described its influence on the structural seismic response, the parameters, except for MR and FS_v, were fixed for the sensitivity analysis. The results demonstrated that the foundation inertia of heavier foundations induced more settlement due to sliding behavior of heavily-loaded systems. Moreover, the structural inertia of heavier structures evidently exhibited foundation rocking behavior, which results in a more elongated natural period of the structure for lightly-loaded systems.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2000년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2000
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• pp.348-355
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• 2000

The characteristics on non linear behavior and the failure mechanism of RC space frame structure serving railway under seismic action have been investigated by numerical analysis in time domain. The structure concerned is modeled in 3 dimensional extent and RC frame elements with fibers are employed. Fibers are characterized as RC one and PL one to distinguish different energy release after cracking. Due to deviation of mass center and stiffness center of entire structure the complex behavior under seismic action is shown. The excessive shear force is concentrated on the pier beside flexible one relatively, which leads to failure of bridge concerned.

• 한국멀티미디어학회논문지
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• 제5권6호
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• pp.730-744
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• 2002

최근의 정보시스템의 전형적인 형태인 웹기반 정보시스템(WBIS)은 계속적으로 재구성되어 야만 사용자의 욕구를 만족시킬 수 있으며 수익을 창출할 수 있다. 이를 위해, 시스템의 항해구조를 모델링하고 분석해야 하며 로그파일을 통해 사용자의 행동을 모델링하여 시스템의 재구성시에 활용해야한다. 이에 따라, 본 논문에서는 쇼핑몰을 포함한 WBIS의 재구성(또는 튜닝)을 위한 항해구조의 모델링 및 사용자행동 모델링 방법을 제시한다. 항해구조의 모델링을 위해 구조모델, 상태전이 모델 및 패트리넷 모델 및 분석방법을 제시하였다. 또한, 사용자행동 모델링을 위한 로그분석을 위해, 사용자행동 모델링 알고리즘을 제시하고 이를 구현하였다. 끝으로, 재구성 휴리스틱을 제시하였으며 제시한 방법들은 사례 WBIS에 적용하였다.

• Steel and Composite Structures
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• 제34권6호
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• pp.891-907
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• 2020

Many studies reveal that during destructive earthquakes, most of the structures enter the inelastic phase. The amount of hysteretic energy in a structure is considered as an important criterion in structure design and an important indicator for the degree of its damage or vulnerability. The hysteretic energy value wasted after the structure yields is the most important component of the energy equation that affects the structures system damage thereof. Controlling this value of energy leads to controlling the structure behavior. Here, for the first time, the hysteretic behavior and energy dissipation capacity are assessed at presence of elliptical braced resisting frames (ELBRFs), through an experimental study and numerical analysis of FEM. The ELBRFs are of lateral load systems, when located in the middle bay of the frame and connected properly to the beams and columns, in addition to improving the structural behavior, do not have the problem of architectural space in the bracing systems. The energy dissipation capacity is assessed in four frames of small single-story single-bay ELBRFs at ½ scale with different accessories, and compared with SMRF and X-bracing systems. The frames are analyzed through a nonlinear FEM and a quasi-static cyclic loading. The performance features here consist of hysteresis behavior, plasticity factor, energy dissipation, resistance and stiffness variation, shear strength and Von-Mises stress distribution. The test results indicate that the good behavior of the elliptical bracing resisting frame improves strength, stiffness, ductility and dissipated energy capacity in a significant manner.

• 한국가정과교육학회지
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• 제7권1호
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• pp.29-45
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• 1995

The purpose of this study was to investigate eating behavior and the attitude about weight control of the High School Girls. The questionnaires were completed by 519 girls’ high school students.(lived in city ; 269, in mine region ; 250) The results were as follows: 1. The average stature of them was 159.01${\pm}$5.09cm, the average weight was 51.64${\pm}$6.76kg. 2. In the present body structure of them, the underweight structure was 26.2% the normal weight structure was 58.4% the overweight structure was 15.4%. The present body structure was very different from the recognition of their own body structure. 3. The average point of the eating behavior was 52.07 and that of city(53.62 point) was higher than mine region(50.01 point). 4. The rate of going without breakfast(P<0.05) the frequency of snack(p<0.001) the eating rate of stimulus foods(p<0.05) the interest healthy food life(p<0.05) in two regions showed the significant difference. 5. The point of eating behavior in two regions showed the positive correlation in the economic level, the contentment degree of the present body structure, the conscious healthy condition. But it showed the negative correlation in the rate of going without of breakfast. On observing the difference of the tow regions, it showed the positive correlation to mother’s education career on the negative relation to the experience of the weight control in the city. In the other hand it showed the negative correlation to the recognition on degree of the present body structure in the mine region. 6. The contentment degree of the present body structure showed the negative correlation to the experience of the weight control. Also it showed the negative correlation to the rate of going without breakfast in the city.