• International Journal of Advanced Culture Technology
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• v.11 no.1
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• pp.153-158
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• 2023

Experts are concerned about the lack of troops and security vacuum due to the low birth rate in the Republic of Korea. They consider policies to expand the proportion and role of female soldiers to address these issues. In this regard, We would like to introduce the successful use of female personnel in the Ukrainian military and draw implications for the Korean military. This will provide a clue to offset the shortage of troops in the Republic of Korea.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.720-721
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• 2023

이 논문은 서비스를 제공하는 로봇과 사용자가 상호작용하는 새로운 방식의 XR 인터페이스를 제안한다. 사용자는 제안한 XR 인터페이스를 통해 현실을 모사한 XR 공간 내에서 서비스 로봇에게 직관적으로 서비스 작업이나 공간 이동을 요청하고, 요청한 작업을 편리하게 관리할 수 있다. 이러한 명령, 이동, 편집은 용이하게 전환된다. HTC VIVE 와 Unity 엔진을 사용하여 프로토타입을 구현하였다. 추후 인터페이스를 실제 로봇 시스템과 통합하고, 사용자 테스트를 수행하여 사용성 향상을 검증하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.05a
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• pp.569-572
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• 2008

최근 각광 받고 있는 서버 기반 컴퓨팅(SBC, Server-based Computing)은 많은 수의 서버가 필요하기 때문에 많은 수의 서버를 관리할 수 있는 관리자 시스템의 필요성이 대두되고 있다. 이에 관리자 네트워크를 필요에 따라, 코맨드 센터(CC, Command Center), 서버 에이전트(SA, Server Agent), 관리자 인터페이스(Manager Interface), 유저 에이전트(UA, User Agent)등 네 가지 모듈로 분리하여 필요한 시스템 기능을 구현하는 것만으로 저비용으로 신뢰성 있는 네트워크를 구축할 수 있는 네트워크 프레임워크를 개발하고, 그 성능을 측정하였다.

• Proceedings of the KSRS Conference
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• 2005.10a
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• pp.564-566
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• 2005

The relation between HPA (High Power Amplifier) and COMS (Communication Ocean Meteorological Satellite) multi-carrier is analyzed in this paper. MODAC (Meteorological and Ocean Data Application Center) has a primary mission to transmit processed data, HRIT (High Rate Information Transmission) and LRIT (Low Rate Information Transmission), which is normalized and calibrated by pre-processing. It is also replaced with the SOC (Satellite Operation Center) in emergency case and can transmit the command and ranging tones for operation of COMS. From the result of simulation with modelled HPA, it is found that the multi-carrier in one HPA can give rise to an inter-modulation which makes harmonic and spurious elements increase in-band. Under the environment of these increased parasitic elements, the degradation of multi-carrier's quality is estimated from the ratio of the amount of noise to total output power of HPA.

• Journal of Power Electronics
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• v.16 no.4
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• pp.1355-1366
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• 2016

In the present paper, a speed control algorithm with fast response characteristics is proposed to reduce the shift shock of medium/large-sized electric vehicles equipped with a two-speed AMT. Shift shocks, which are closely related with to the vehicles' ride comfort, occur due to the difference between the speed of the motor shaft and the load shaft when the gear is engaged. The proposed speed control method for shift shock reduction can quickly synchronize speeds occurring due to differences in the gear ratios during speed shifts in AMT systems by speed command feed-forward compensation and a state feedback controller. As a result, efficient shift results without any shift shock can be obtained. The proposed speed control method was applied to a 9 m- long medium- sized electric bus to demonstrate the validity through a simulated analysis and experiments.

• Journal of Advanced Marine Engineering and Technology
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• v.32 no.7
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• pp.1061-1067
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• 2008

Direct Torque Control[DTC] and Vector Control are the two schemes developed for high performance induction motor drives. DTC based induction motors are being increasingly used in various industrial applications. DTC offers fast torque response and better speed control with lesser hardware and processing costs as compared to vector controlled drives. However, conventional DTC suffers from high torque ripple, current harmonics and low performance during torque transients. In this paper a new Direct Torque Control[DTC] method of induction motor is presented. In comparison with the conventional DTC method, the PWM technique is applied to proposed control method. In this method, decoupling mechanism is not required and the torque, the flux magnitude are under control using PI controllers and generating the voltage command for inverter control. Therefore torque and speed ripple could be reduced in comparison with the conventional switching table DTC.

• Bulletin of the Korean Space Science Society
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• 2008.10a
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• pp.35.3-36
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• 2008

The ground-based spacecraft simulator is a useful tool to realize various space missions and satellite formation flying in the future. Also, the spacecraft simulator can be used to develop and verify new control laws required by modern spacecraft applications. In this research, therefore, Hardware-in-the-loop (HIL) simulator which can be demonstrated the experimental validation of the theoretical results is designed and developed. The main components of the HIL simulator which we focused on are the thruster system to attitude control and automatic mass-balancing for elimination of gravity torques. To control the attitude of the spacecraft simulator, 8 thrusters which using the cold gas (N2) are aligned with roll, pitch and yaw axis. Also Linear actuators are applied to the HIL simulator for automatic mass balancing system to compensate for the center of mass offset from the center of rotation. Addition to the thruster control system and Linear actuators, the HIL simulator for spacecraft attitude control includes an embedded computer (Onboard PC) for simulator system control, Host PC for simulator health monitoring, command and post analysis, wireless adapter for wireless network, rate gyro sensor to measure 3-axis attitude of the simulator, inclinometer to measure horizontality and battery sets to independently supply power only for the simulator. Finally, we present some experimental results from the application of the controller on the spacecraft simulator.

• The Korean Journal of Community Living Science
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• v.24 no.2
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• pp.209-220
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• 2013

This study is based on the interviews with six mothers to analyze their verbal response types with their young children ages 3-5 attending day-care center. This study was done from 10AM. to 12PM. August 18th 2012 at the director's room at P day care center in Seoul. For this study the following four situations mothers experience in child-rearing have been selected: self-achievement, sibling quarrel, nagging and isolation. As for the interview questionnaires the four verbal response types-stimulating, problem-solving, critical and indifferent ones-have been used. According to the results of this research, mothers tend to use stimulating verbal response types like praise in the situation of self-achievement; problem-solving response types like command in the situation of sibling quarrel; problem-solving response types like warning in the situation of nagging; and lastly, stimulating verbal response types like empathy in the situation of isolation. Mothers need to form more empathy with their children in such difficult situations as sibling quarrel or nagging. For mothers' efficient verbal responses for their children, accordingly, empathy in parent education needs to be more emphasized.

• Nuclear Engineering and Technology
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• v.46 no.5
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• pp.667-674
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• 2014

One of the largest problems for tokamak devices such as Kazakhstan Tokamak for Material Testing (KTM) is the operation scenarios' development and execution. Operation scenarios may be varied often, so a convenient hardware and software solution is required for scenario management and execution. Dozens of diagnostic and control subsystems with numerous configuration settings may be used in an experiment, so it is required to automate the subsystem configuration process to coordinate changes of the related settings and to prevent errors. Most of the diagnostic and control subsystems software at KTM was unified using an extra software layer, describing the hardware abstraction interface. The experiment sequence was described using a command language. The whole infrastructure was brought together by a universal communication protocol supporting various media, including Ethernet and serial links. The operation sequence execution infrastructure was used at KTM to carry out plasma experiments.

• Journal of the Korea Safety Management & Science
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• v.14 no.3
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• pp.67-75
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• 2012

Because recently(July 14, 2011) fire occurred in the engine room of a moving taxi under Namsan Tunnel 1, 51 vehicles' driver and more than 250 passengers in the road tunnel were urgently evacuated with abandoned vehicles. Vehicle fires in Namsan Tunnel that day, Sufferers struggled to escape quickly difficult to escape the two-way by abandoned vehicles on the road and to fear many casualties by using vehicle fuel and combustible interior and the driver who is ignorant of vehicle accident continuous entered in the road tunnel had accessibility the site of fire department was more difficult. In this study, It is to investigate structure and basic materials, such as fire extinguish equipment and facilities for damage prevention and to analyze the problems and to plan improvement method of fire extinguish equipment, facilities for damage prevention and transportation facilities(Large traffic signs, Breaker, etc.) on the Namsan Tunnel that in the long-term plan is prepared to strengthen for accessibility of the site of fire department in case of Vehicle's fire.