• 에너지공학
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• 제23권3호
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• pp.96-101
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• 2014

원자력발전소의 원자로보호계통 및 공학적안전설비계통의 계측채널 설정치는 발전소 안전성을 확보하는 데 있으며, 출력조건의 변화시에는 보호계통의 작동이 보장되어야 한다. 본 연구에서는 발전소 운영자료, 시방서 및 운전 매뉴얼등을 사용하여 설정치를 평가하는 데 불확실도의 중요한 요소인 계측기와 process rack drift의 적절성을 확인하고, 설정치 여유가 부족할 경우에 대한 대책을 연구하였다.

• 한국경영과학회지
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• 제13권1호
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• pp.39-50
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• 1988

The warehousing of inventories is an enormous expense to industries worldwide, and yet there are few available that can be used to design rack storage systems while considering overall system costs. The primary objective of this paper is the development of an overall ware hous storage system costs model to aid a warehous planner in the design of automated warehouse systems. A simulation model and statistical estimation procedures are used to determine the maximum inventory levels accumulated in the receiving, storage, and shipping areas. The overall cost model is developed to determine the required total land, the initial investment fund, the number of pieces of handling equipment, and the storage rack configuration for the main storage area. A numerical example is then presented to demonstrate the application of the overall system cost model developed in this paper.

• 한국자동차공학회논문집
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• 제5권4호
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• pp.39-47
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• 1997

The focus of this research is to set up and describe the mathematical derivation of an automobile power-assisted rack and pinion steering system dynamics. The mathematical model of the power steering system dynamics with a 5 DOF linear vehicle model will be used in the computer simulation and evaluated comparing with the experimental results. This model is flexible to accommodate different vehicles through simple parameter changes. The developed mathematical model will attempt to provide enhanced driver realism to a Systems Technology, Inc. driving SIMulator(STISIM).

• 한국전산유체공학회지
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• 제19권3호
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• pp.24-28
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• 2014

With ever rising concerns about saving of fossil fuel resource, there have been an increasing demand for use of energy more efficiently. The electric motor driven inverters can be a great help to improve energy efficiency. They are also used to control the motor speed to the actual need. Therefore the use of them can lead to reduce energy consumption. In particular, the medium voltage(MV) drive systems used for pumps, fans, steel rolling mills and tractions have widespread applications in the industry. They cover power ratings from 0.4MW to 40MW at the MV level of 2.3kV to 13.8kV. The majority of the installed MV drive systems however, are in the 1MW to 4MW range with voltage rating from 3.3kV to 6.6kV. But they are required to reduce size and weight like other power electronic equipments. In this paper, we studied on the 3.3kV(105A) compact rack type inverter system for improving the cooling efficiency. At first, we confirmed the tendency of temperature with computational simulation using ANSYS ICEPAK and actual experimental tests. And then we researched thermal performance improvement designs in order to reduce temperature of the transformer for the safe operation. It can reduce temperature of transformer that using pipe type flow guide in the system. As a result, we found out more efficient solution by thermal-fluid analysis.

• 품질경영학회지
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• 제16권2호
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• pp.99-110
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• 1988

This study is concerned with a design algorithm to minimize the investment as well as maximize the throughput in automated warehouse system. A simulation model is designed and a solution methodology is proposed. The experiment, are conducted for the cases with 100, 90, 80, 70, 60, 50 and 0 % dual command policies in terms of the important factors such as the crane velocity, the height of system and the rack utilization. The results indicate that the throughput is slightly decreased when the ratio of dual command is decreased and the other characteristics however are not affected. The result also shows that the optimal rack should be designed for a crane to take the same amount of travel time for horizontal and vertical movement.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.424-432
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• 2009

This paper discusses about the implementation of a simulator for the Navigation Control System(NCS) of bimodal tram. To operate a NCS of bimodal tram, values of all sorts of sensors installed in bimodal tram should be transmitted to the NCS, and the NCS calculates the measured sensor values to determine traveling direction, traveling speed, current position etc. The implementation of the simulator consists of a device applying driver's input transaction function & virtual sensor program and a sub-rack device that controls communication with the NCS to evaluate navigation control function. The virtual sensor program can create routes (map), traveling profiles & seat information et cetera in order to transmit to the NCS, analyzes driver's input values and NCS output values to create virtual sensor values. The sub-rack device takes charge of communication with the NCS using CAN-OPEN, CAN-J1939, MVP protocols. This paper discusses about the implementation of the simulator and afterwards analyzes and evaluates the NCS simulation results.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.472-475
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• 2003

Electric Power Steering (EPS) mechanism has become widely equipped in passenger vehicle due to the environmental consciousness and higher fuel efficiency. This paper describes the development of co-simulation technique and simulation integration technique of EPS control system with dynamic vehicle model. A full vehicle model interacted with EPS control algorithm is concurrently simulated on a single bump road condition. Dynamic responses of vehicle chassis and steering system resulting from road surface impact are evaluated and compared with proving ground experimental data. The comparisons will show reasonable agreement on tie-rod load. rack displacement, handle-wheel torque and tire center acceleration. This developed simulation capability can be used for EPS performance evaluation and calibration as well as for vehicle handling performance integration and synthesis.

• Steel and Composite Structures
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• 제52권1호
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• pp.1-14
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• 2024

This paper introduces a system allows for seismic isolation of the pallet from the rack in the down-aisle direction, occupies minimal vertical space (5 cm) and ±7.5 cm of deformation range. A conceptual model of the isolation system is presented, leading to a constitutive equation governing its behavior. A first experimental campaign studying the response of the isolation system's components was conducted to calibrate the parameters of its constitutive equation. A second experimental campaign evaluated the response of the isolation system with mass placed on it, subjected to cyclic loading. The results of this second campaign were compared with the numerical predictions using the pre-calibrated constitutive equation, allowing a double-blind validation of the constitutive equation of the isolation system. Finally, a numerical evaluation of the isolation system subjected to a synthetic earthquake of one component. This evaluation allowed verifying attributes of the proposed isolation system, such as its self-centering capacity and its effectiveness in reducing the absolute acceleration of the isolated mass and the shear load transmitted to the supporting beams of the rack.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2013년도 춘계학술대회 논문집
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• pp.287-288
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• 2013

• 대한한방내과학회지
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• 제19권2호
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• pp.28-36
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• 1998

Background : Yang-do-rack is frequently used in diagnosing syndromes in oriental medical hospital, but there has been few clinical report on Yang-do-rack. So we intended to find out the relationship among Yang-do-rack, general characteristics and the differentiaion of syndromes in acute stroke patients. Materials and Methods : In this study we selected the subjects who were hospitalized from March 1, 1998 to July 31. 1998 at the department of circulatory internal medicine at college of oriental medicine, in Kyung-Hee University, diagnosed acute cerebral infarction or hemorrhage within 7 days after onset time. We checked Yang-do-rack scores with Autonomic Nervous System YORAK (Sord Medicom co. Ltd, Korea) and calculated the scores of each diffentiation of syndroms. Resuts : 1. In left leg meridian, there was more numerical value male than female on LF1, LF2, LF4, LF6. The value of LF1, LF3, LF4, LF5 was getting lower as the score of heat-transformation syndrom(火熱證) increased. 2. In left arm meridian, there was more numerical value male than female on LH2, LH5. The value of LH1, LH3, LH5 was getting lower as the score of exuberance of Yang due to deficiency of Yin syndrom(陰虛陽亢證) increased. 3. In right leg meridian, there was more numerical value male than female on RF1, RF2, RF4, RF6. The value of RF3, RF5 was getting lower as the score of heat-transformation syndrom(火熱證) increased and RF4 as the score of exuberance of Yang due to deficiency of Yin syndrom(陰虛陽亢證) increased. 4. In right arm meridian, the value of RH1 was getting lower as the score of exuberance of Yang due to deficiency of Yin syndrom(陰虛陽亢證) increased. These results show that the Yang-do-rack diagnosis could offer supplemental help for diffrentiation of syndroms in acute stroke patient.