• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2001년도 추계 학술발표회 논문집 Proceedings of EESK Conference-Fall 2001
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• pp.155-162
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• 2001

In this study, it was performed that the seismic response analysis using long period earthquake wave and short period earthquake wave on dynamic behavior of concrete gravity dam. The results showed that if the same magnitude earthquake waves acted on concrete dam, the maximum displacement and stress at dam crest of long period wave(0funato wave) were about 30 % larger than those of short period wave(Hachinohe wave). And the response acceleration of dam crest was amplified about 5 times in long period earthquake wave and about 3 times in short period earthquake wave.

• 한국통신학회논문지
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• 제24권6B호
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• pp.1004-1014
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• 1999

무선 ATM MAC 프로토콜은 시스템의 처리율 성능을 높이고 이를 안정적으로 유지시킬 수 있어야 한다. 이를 위하여, 본 논문에서는 무선 ATM의 MAC 프로토콜에 사용되는 동적 제어 알고리즘으로써 DSPA (Dynamic Signalling Period Allocation) 알고리즘을 제안하였다. 제안된 DSPA 알고리즘은, 고정된 처리율을 이용하지 않고 단말로부터 전송된 정적 및 동적 매개변수만을 이용하여 제어용 슬롯을 동적으로 발생하는 제어용 슬롯 발생 알고리즘, 시스템의 사용 상황에 따라 기지국이 매번 신호 주기를 동적으로 결정하게 하므로써 매 순간 최적의 신호주기가 할당되도록 하는 동적 신호 주기 할당 알고리즘, 그리고 슬롯이 할당될 때마다 단말의 우선 순위를 변화시키는 동적 슬롯 할당 알고리즘으로 크게 구성된다. 모의실험을 통한 성능 평가 결과, DSPA 알고리즘은 시스템의 사용 상황을 반영하여 신호 주기를 동적으로 결정하므로써 단말의 평균 대기 시간을 감소시키고 이로부터 서비스 품질을 보장할 수 있는 부하 한계를 향상하며, 안정적인 처리율 성능을 보임을 알 수 있다.

• 한국국방경영분석학회지
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• 제7권2호
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• pp.63-99
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• 1981

The generalized goal decomposition model proposed by Ruefli as a single period decision model is presented for the purpose of a review and extended to make a multiple period planning model. The multiple period planning model in the three level organization is formulated with, linear goal deviations by introducing the goal programming method. Dynamic formulation using the generalized goal decomposition model for each single period problem is also presented. An iterative search algorithm is presented as an appropriate solution method of the dynamic formulation of the multiple period planning model.

• 산업경영시스템학회지
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• 제31권2호
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• pp.19-27
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• 2008

This paper addresses determining the location of the distribution centers in a discrete dynamic distribution system. In discrete and finite time horizon, the demands of retailers are dynamic for the periods. Some locations among the retailers can be chosen for the role of the distribution centers at the beginning of each period. The distribution centers have to be located at the location of minimizing logistics cost. Logistics cost factors are the operation cost and the fixed cost of distribution center, and the transportation cost. The distribution centers of minimizing sum of operation cost, fixed cost and transportation cost are determined among retailers in each period for the planning period. A mathematical model was formulated and a dynamic programming based algorithm was developed. A numerical example was shown to explain our problem.

• 한국공간구조학회논문집
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• 제15권4호
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• pp.107-114
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• 2015

Large spatial structures can not easily predict the dynamic behavior due to the lack of construction and design practices. The spatial structures are generally analyzed through the numerical simulation and experimental test in order to investigate the seismic response of large spatial structures. In the case of analysis for seismic response of large spatial structure, the many studies by the numerical analysis was carried out, researches by the shaking table test are very rare. In this study, a shaking table test of a small-scale arch structure was conducted and the dynamic characteristics of arch structure are analyzed. And the dynamic characteristics of arch structures are investigated according to the various column cross-section and length. It is found that the natural vibration periods of the small-scaled arch structure that have large column stiffness are very similar to the natural vibration period of the non-column arch structure. And in case of arch structure with large column stiffness, primary natural frequency period by numerical analysis is very similar to the primary natural frequency period of by shaking table test. These are because the dynamic characteristics of the roof structure are affected by the column stiffness of the spatial structure.

• Nuclear Engineering and Technology
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• 제23권1호
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• pp.30-40
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• 1991

한국형 다목적 연구로(KMRR)의 출력 자동제어를 위하여 새로운 제어이론으로 등장한 반응도 제한법을 시간 최적제어에 적용하여 보았다. 반응도 제한법은 원자로내의 반응도가 제어봉의 움직임으로 상쇄될 수 있는 반응도보다 항상 작도록 제한하여 준다. 이 방법을 시간 최적제어에 이용하기 위해 서 는 일정 한 원자로주기를 유지하도록 하는 반응도 값을 Dynamic Period Equation으로 얻어야 한다. 따라서 2점 동특성 방정식에 의한 Dynamic Period Equation이 새로 유도되었다. 이 제어법을 시험하기 위해 수학적 모델로 구성된 제어모델을 원자로 모의 전산코드인 KMRSIM에 적용하여 보았다. 반응도제한법도 출력의 시간 최적제어에서 신뢰할만한 결과를 보여줌을 알았다.

• 한국전문물리치료학회지
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• 제23권4호
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• pp.16-26
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• 2016

Background: Deficiencies in the ability to maintain balance are common in elderly. Augmented feedback such as knowledge of results (KR) can accelerate learning and mastering a motor skill in older people. Objects: We designed this study to examine whether one session of Wii-Fit game with self-regulated KR is effective for elderly people, and to compare the effect of two different timings of self-regulated KR conditions. Methods: Thirty-nine community-dwelling elders, not living in hospice care or a nursing home, participated in this study. During acquisition, two groups of volunteers were trained in 10 blocks of a dynamic balancing task under the following 2 conditions, respectively: (a) a pre-trial self-regulated KR ($n_1=18$), or (b) a post-trial self-regulated KR ($n_2=21$). Immediate retention tests and delayed retention tests of balancing performance were administered in 15 minutes and 24 hours following acquisition period, respectively. Results: In both groups, significant improvements of balancing performances scores were observed during the acquisition period. Regardless of the group, mean of balancing performance scores on retention tests were well-maintained from the final session. There were no significant differences between groups in balancing performance scores during the acquisition period (p>.05); however, the post-trial self-regulated KR group exhibited significantly higher balancing performance scores in both the immediate retention test and delayed retention test than that of the pre-trial self-regulated KR group (p<.05). Conclusion: Therefore, subjects who regulated their feedback after a dynamic balancing task, during the acquisition period, experienced more efficient motor learning during the retention period than did subjects who regulated their feedback before a dynamic balancing task. Accordingly, in case of presenting the KR of motor learning in clinical settings to elders who reduced dynamic balance abilities, the requesting time of KR is imperative according to self-estimation processes as well as types of KR and practice.

• 한국지반환경공학회 논문집
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• 제20권12호
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• pp.5-14
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• 2019

최근 우리나라에서 지진이 발생하여 대도시의 초고층 건물의 내진연구가 증가하고 있다. 하지만 대부분의 초고층 건물의 내진연구 및 해석은 지반을 간접적으로 고려하고 있다. 또한 지진파 탁월주기의 영향이 거의 고려되고 있지 않는 실정이다. 따라서 본 연구에서는 지진파 탁월주기가 초고층 건물 동적거동에 미치는 영향이 지반을 고려하는 연속체 모델을 적용하여 분석되었다. 이를 위해 유한요소기반의 수치해석 프로그램인 MIDAS GTS NX를 사용하여 선형시간이력해석을 적용한 2D 동적해석을 수행하였다. 또한 동적거동 분석을 위해 수평변위, 층간변위비, 휨응력 및 건물 취약부를 이용하였다. 연구 결과, 전반적으로 초고층 건물은 지진파 탁월주기가 길어질수록 더 큰 동적반응이 발생하였다. 또한 지진파 탁월주기가 다른 파라미터인 지반조건, 지진파 크기보다 더 큰 영향을 주는 것으로 나타났다.

• 대한기계학회논문집
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• 제17권11호
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• pp.2684-2693
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• 1993

The free vibration and dynamic response of cross-ply for CFRP and GFRP laminated circular cylindrical shells under dynamic loadings are investigated by using the first-order shear deformation shell theory. The modal analysis technique is used to develop the analytical solutions of simply supported cylindrical shells under dynamic load. The analysis is based on an expansion of the loads, displacements and rotations in a double Fourier series which satisfies the and boundary conditions of simply support. Analytical solution is assumed to be separable into a function of time and a function of position. In this paper, the considered load forces are step pulse, sine pulse, triangular(1, 2, 3) pulse and exponential pulse. The solution for a given loading pulse can be found by involving the convolution integral. The results show that the dynamic response are governed primarily by the natural period of the structure.

• 대한전기학회논문지:시스템및제어부문D
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• 제53권5호
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• pp.361-367
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• 2004

This paper describes design of an algorithm for analyzing human activity using body-fixed 3-axis accelerometer in the small of the back. In the first step, we distinguish static and dynamic activity period using AC signal analysis. Then five postures were classified by applying the threshold in DC signal corresponding to the static activity period. Also, after comparison of average power and taking negative peak signal in the dynamic activity period, the four dynamic activities were classified by adaptive threshold method. To evaluate the performance of the proposed algorithm, the measured signals obtained from six subjects were applied to the proposed algorithm and the results were compared with the simultaneously measured video data. As a result, the activity classification rate of 95.7％ on average was obtained. Overall results show that the proposed classification algorithm has a possibility to be used to analyze the static and dynamic physical activity.