• 전기학회논문지P
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• 제55권4호
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• pp.183-189
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• 2006

In this work, the digital simulator for testing of digital protective relay is presented. The proposed simulator software has EMTP simulation data file conversion, sequence waveform generation, user define simulation data generation, communication engine, data analysis engine and measurements function etc. The simulator hardware is designed using 32bit floating point DSP architecture to achieve flexibility and high speed operation. This simulator is tested to evaluate the performance of relay simulator by using a output data of simulation model on EMTP.

• 대한전자공학회논문지TC
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• 제40권10호
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• pp.119-128
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• 2003

인터넷 사용자의 급증, 서비스의 다양화, 전송속도의 고속화, 이용 분야의 확대 등으로 인해 인터넷 트래픽이 매년 급속하게 증가하고 있다. 이러한 수요를 충족시키기 위하여 대용량의 대역폭을 제공하는 WDM 기술과 IP 망을 효율적으로 통합한 MPLS를 기반으로 하는 MPλS 프로토콜이 제안되었다. 본 논문에서는 ns-2 네트워크 시뮬레이터의 기능을 확장하여 MPλS 네트워크 시뮬레이터를 설계하고 구현하였다. 구현한 시뮬레이터는 OXC(Optical Crossconnect) 모듈, 효율적인 파장 할당을 위한 RWA(Routing and Wavelength Assignment) 모듈, 다중 파장 링크 모듈, MPλS 시그널링 및 제어 모듈 등으로 구성된다. 구현한 시뮬레이터 상에서 처리율 및 블로킹 확률 등의 파라미터를 이용하여 MPλS의 성능을 검증하였으며 구현한 시뮬레이터는 시스템 개발 이전 단계에서 제안된 프로토콜의 기능을 검증하는데 유용하게 사용 될 수 있을 것으로 사료된다.

• 대한통합의학회지
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• 제8권2호
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• pp.89-95
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• 2020

Purpose : This study aims to evaluate the correlation of cognitive function, activities of daily living (ADL), and driving performance in stroke hemiplegic patients residing in Korea. Methods : Subjects of the study were 18 stroke hemiplegic patients admitted to hospitals situated in Seoul. A clock drawing test (CDT), a modified Barthel index (MBI), and a virtual reality driving simulator (Eca faros-driving simulator) were used to examine their cognitive function, their ADL ability, and their driving skills, respectively. Results : Driving skills of stroke hemiplegic patients were shown to be associated with the CDT evaluation tool (r=-.777) (p<.001), but they were found to have any correlation with MBI (r=-.022) (p>.05). Additionally, an individual's CDT showed that the driving simulator evaluation result (pass/fail) could be discriminated with a sensitivity of 100.0 %, a specificity of 40.0 %, and an accuracy of 66.7 %. The result confirmed that the CDT is a useful evaluation tool for screening driving ability in people with stroke. But the MBI did not show any significant results (sensitivity of 62.5 %, specificity of 40.0 %, and predicted the results of the simulator with 50.0 % of accuracy) (p>.05). Conclusion : This study shows that cognitive function influences the driving performance in people with stroke. Driving skills of stroke hemiplegic patients are seen to be highly related to CDT. In the field of driving rehabilitation, these findings could be useful for evaluating driving skills relating to CDT. Furthermore, the study results will set a guideline for domestic occupational therapists to use the evaluation tool for assessing driving abilities in people with stroke.

• 한국도로학회논문집
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• 제9권4호
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• pp.129-134
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• 2007

일반적으로 도로정책평가 시, 이상적인 도로 교통조건에서 수집한 교통류 자료에 근거하여 BPR식 형태로 개발한 통행비용함수식을 일반화하여 적용한다. 하지만, BPR 형태로 개발된 모형은 장래교통량예측이나 통행행태분석에 있어서 적용이 도로 교통환경을 묘사하는데 적합하지 않은 것으로 보고되고 있다.(Spiess, 1989 ; Singh, 1999) 따라서 본 연구는 이러한 문제점을 해결하기 위해, 분석대상지의 도로 교통조건에 적합하도록 미시적 교통류시뮬레이터기반(Micro traffic Simulator Based : MSB)으로 생성된 자료로 통행비용함수를 개발, 검증하는 분석방법론을 제시하였으며, 주요 연구결과는 다음과 같다. 첫째, 이상적인 도로교통조건 이외의 상황에 대한 도로교통정책 평가에 적용이 용이하도록, 단시간에 다량의 교통류 자료생성이 가능한 미시적 교통류시뮬레이터(VISSIM)를 이용하여 분석대상지에 적합한 통행비용함수를 개발하는 방법론을 제시하였다. 둘째, VISSIM을 이용하여 생성한 분석자료를 기반으로 하여 BPR 함수식과 MSB 함수식을 각각 개발하고, 통계값 및 산포도를 이용한 모형들의 비교분석을 통하여 MSB 함수식의 활용가능성을 검증하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2008년도 지능정보 및 응용 학술대회
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• pp.175-178
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• 2008

위성항법을 위해 정밀시각정보를 생성하는 시뮬레이터는 GPS의 위성 궤도정보를 생성하는 기능과 위성 궤도 정보를 이용하여 위성의 위치를 생성하는 기능, 위성과 수신기 사이의 실제거리를 생성하는 기능과 위성으로부터 수신기까지 신호가 전파하는 동안에 발생하는 각종 오차 요인들을 모델링하여 실제거리에 적용하는 과정을 제공해야 한다. 또한 다양한 방법으로 적용하기 위해 의사거리는 전세계표준인 RINEX 포맷으로 출력하는 기능을 제공해야 한다. 이에 본 논문에서는 GPS 위성으로부터 임의의 지표상의 사용자까지의 의사거리를 생성하기 위한 시뮬레이터의 설계과정을 제안하고 GPS 위성의 경우를 적용하여 그 결과를 제시한다.

• The Journal of Korean Physical Therapy
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• 제32권6호
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• pp.383-387
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• 2020

Purpose: The purpose of the present study was to investigate the effects of a simultaneous dual-task and horse-riding simulator (HRS) training regime on pulmonary function and flexibility. Methods: Sixteen subjects were recruited and randomly allocated to two groups: a dual-task (DT) (n=8) or a single-task (ST) (n=8) training group. Flexibility and pulmonary function were assessed before and after HRS training. Both groups underwent HRS training for 4 weeks, 3 times/week in 15-minute training sessions. The ST group underwent HRS training and the DT group underwent dual-task HRS training, which consisted of throwing and catching a ball and ring catching while HRS training. Results: Training significantly increased flexibility and FVC (forced vital capacity) and FEV1 (forced expiratory volume in 1 second) in both groups (p<0.05), but FEV1/FVC and PEF (peak expiratory flow) were not significantly different after training in both groups (p>0.05). After the training, flexibility and FVC in the DT group were significantly greater than in the ST group (p<0.05), but FEV1, FEV1/FVC, and PEF were not significantly different (p>0.05). Conclusion: Simultaneous dual-task and HRS motor training improved flexibility, FVC, and FEV1, and our comparative analysis suggests that dual-task HRS training improved flexibility and FVC more than single-task training.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 하계학술대회 논문집 D
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• pp.3192-3194
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• 2000

Many I/o cards such as AOCs, DICs, DOCs and ROCs are used to deal with I&C instruments of control panel in full-scope power plant simulator. To help the maintenance of I/O cards, an I/o card fault diagnosis system is implemented in this paper. The implemented fault diagnosis system has the automatic fault diagnosis function and manual card test function for fault diagnosis. Finally, the test result using I/O cards shows the validity of the implemented fault diagnosis system.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2001년도 춘계학술대회 논문집
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• pp.711-714
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• 2001

As the life cycle of the vehicle become shorter, the method that reduce the development time of new model become more important. In this reason, the development of the simulator that provides similar environment with the actual vehicle road characteristics is increasing. In this paper, the multi-axis simulator is designed and analyzed by kinematic method. The simulator has a function simulating the 3 load elements; vertical, longitudinal, and lateral force respectively and simultaneously. The result of this paper can be used for developing the multi-axis simulator linkage.

• 대한의용생체공학회:의공학회지
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• 제34권1호
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• pp.40-45
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• 2013

The conventional simulators used the expensive commercial artificial heart with a limited performance, and focused on replicating the heart function. The arterial pressure is the key factor of the cardiovascular disease. The purpose of this study is to develop a simulator focused on the pressure wave. The simulator is composed of a step motor, slider-crank mechanism, piston-cylinder, two check valves, a elastic tube, and two reservoirs. With the changes of design parameters, the functions of the simulator were evaluated. The simulator shows the good agreement of the characteristics of the cardiovascular system.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2005년도 춘계학술대회 논문집
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• pp.149-153
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• 2005

In the cardiovascular system, the waveform of the pulsatory blood pressure appears variously due to the cardiac impulse and compliance of blood vessels and arm tissue. We have constructed a blood pressure simulator to investigate effects of mechanical properties of artery walls and tissue on blood pressure measurements. The blood pressure simulator is designed to reproduce wave forms of blood pressure in human arteries. To minimize tracking error, we use a linear control valve, and adapt a hybrid control scheme which consists of a feedback controller and a feedforward controller. Any form of the pressure wave can be reproduced, changing function of the wave form in the computer connected to the simulator for control. From experiments, it has been shown that the simulator reproduces wave forms very well, and that the hybrid scheme adapted is superior to the feedback controller.