• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.12
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• pp.1002-1010
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• 2013

Intercom System(ICS) of Korean Utility Helicopter(KUH) is an essential equipment for pilot to perform flight mission and it consists of communication system of KUH with VHF-FM radio set and U/VHF-AM radio set. It provides pilots and crews with internal communication, external communication and audible alarm. It has function of controlling volume and selecting two communication modes, normal mode and backup mode. This paper summarizes pilot comments in flight test which are classified by cause of occurrence and the troubleshooting process about each comment. It also describes design improvements which was derived from troubleshooting and suggests verification results of flight test.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.12 no.2
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• pp.62-68
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• 1998

In this paper, we proposed the design of the intelligent traffic control system by using multiprocessor architecture. The inter-processor communication of the architecture is implemented by sharing the serial communication channel. In comparing the conventional traffic control system using single processor architecture, the proposed system uses multiple processors controlling the sub systems such as the signal lights, traffic measurement unit, auxiliary signal lights and peripherals. The main processor controls the communication among the processors and the communication protocol link to the central control center at remote site. The proposed architecture reduces the load and simplifies the program of each processor and enables the real time processing of the add-on features of intelligent traffic control systems. The architecture is implemented and the common channel inter-processor communications and the real time operation is experimented .experimented .

• Journal of Radiation Protection and Research
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• v.28 no.1
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• pp.25-33
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• 2003

The automatic system for $^{67}Ga$ production using for the diagnosis of malignant tumor has been developed. A solvent extraction and an ion exchange chromatography were used for the separation $^{67}Ga$ from the irradiated enriched $^{68}Zn$. This system consisted of a solvent separation unit which was composed of micro conductivity cells, air supply tubes, solvent transfer tubes, solenoid valves and glasses, a PLC based controller and a PMU user interface unit for automation. The radiation exposure to the workers and the production time can both be reduced by employing this system during the $^{67}Ga$ production phase. After all, the mass production of $^{67}Ga$ with high efficiency was possible.

• Journal of the Korean Institute of Intelligent Systems
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• v.25 no.2
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• pp.147-154
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• 2015

In this paper, we propose human detection and fuzzy temperature control system for energy reduction of cooling device in elevator. In order to improve problems of existing cooling device using the refrigerant, energy reduction and efficient management are continuously achieved because of operation of thermoelectric cooling device using the human detection and fuzzy temperature control system. The proposed system confirms the number of passengers in elevator and temperature is then controlled by those numbers and an average temperature for the season in fuzzy system. The human detection method scans the number of passengers using a head part as a feature based on bird's-eye view camera in elevator. The fuzzy system determines elevator internal temperature considering atmospheric temperature and the scanned passenger numbers as a look-up table. The proposed system reduces energy of the cooling device through the human detection and temperature control. In experiment, energy reduction is confirmed and the performance of the proposed system is verified.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.3
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• pp.133-138
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• 2022

Digital radiation inspection equipment is a medical device that deals with human life and requires stability and high reliability. However, this system is currently the most advanced technology and the domestic market is almost occupied by European products including Japan. Therefore, research and development are needed not only to replace domestic medical devices, which are largely dependent on expensive imported products, but also to develop more economical and user-oriented products that are easy to operate and produce devices that lead to accurate diagnosis. In particular, among the digital X-ray systems, the motor driving technology and the mechatronics technology related to the development of mechanical devices have matured to some extent in Korea. In this paper, selection of AC servomotor for digital radiation inspection suitable for imaging purpose, and application of conversion device and control method to check performance and improve problems.

• 한국HCI학회:학술대회논문집
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• 2006.02a
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• pp.251-256
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• 2006

본 논문에서는 분산 촉각 가상 환경(DHVE; Distributed Haptic Virtual Environments)에서 촉각(haptic) 데이터가 어느 정도의 네트워크 트래픽을 가지며 또 효율적으로 통신 하는지에 대하여 실험하고 그 결과를 기술한다. 본 연구에서 제시하는 실험 데이터는 차세대 인터페이스로 떠오르는 촉각 장치의 높은 전송량과 실시간성을 요구하는 데이터가 분산 환경에서 서비스될 때 어떤 문제점을 가지는지에 대한 실질적이고 의미 있는 자료로 활용될 수 있을 것이다. 본 논문을 통해 우리는 기존의 분산 가상 환경들의 주요 논쟁점인 확장성(scalability), 안정성(safety) 등이 촉각 가상 환경에서는 어떻게 달라지는지 예측하고, 분산 가상 환경에서의 촉각 장치 활용의 유용성, 효율적인 네트워크 사용 방법, 촉각 기반 가상 환경이 구동될 수 있는 최저의 조건에 대해 고찰해 볼 수 있다. 본 논문은 차세대 인터페이스인 촉각 장치를 기존의 시스템에 안정적으로 추가하는 작업에 도움을 주며, 미래의 실감형 네트워크 가상 현실(Immersive Network Virtual Environment) 연구에 기초자료로 활용할 수 있을 것이다.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2591-2593
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• 2005

본 연구는 물체의 좌우측 상단에 연결된 와이어로프를 모터 및 드럼을 통하여 감아 올리거나 내려 놓는 과정에서 물체가 수평상태를 유지하여 이동될 수 있도록 Two Motor-Two Drum 형식의 권양기를 제어 하는 권양기의 밸런스제어장치에 관한 것이다. 본 연구에 Two Motor-Two Drum 형식의 권양기 제어장치에 있어서, 물체의 상단에 연견된 일측 와이어로프와 타측 와이어로프의 이동길이를 실시간으로 검출하는 와이어로프 이동길이검출부와, 이 와이어로프 이동길이검출부를 통하여 검출되는 일측 와이어로프와 타측 와이어로프의 이동길이를 비교하여 물체의 기울어진 좌 우 편차를 검출하는 편차검출부와, 이 편차검출부를 통해 검출되는 좌우 편차를 제거하기 위하여 일측 또는 타측 와이어로프가 감겨있는 드럼을 회전시키는 모터의 구동속도를 조절하여 물체를 수평상태로 보정하는 밸런스제어부로 구성 되어 있다.

• Journal of the Korean Society for Railway
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• v.12 no.1
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• pp.122-128
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• 2009

A bimodal low-floor tram is designed to provide the flexibility of bus and the punctuality of trains together to the passengers. The propulsion equipment of the bimodal tram is a series hybrid type using a set of CNG engine generator and Li-polymer battery. The present paper describes the specifications of the propulsion system in the bimodal tram which was drawn by a desirable driving cycle. In addition, it shows how the propulsion system of the bimodal tram can be controlled. With using a computer simulation tool of hybrid vehicles, ADVISOR, the performance of the bimodal tram was verified.

• The Journal of the Acoustical Society of Korea
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• v.16 no.5
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• pp.12-17
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• 1997

In this work, we developed a new type ultrasonic dehumidifier with piezoelectric ceramics, which and efficiently repel waterdrops on outdoor glass plates exposed to raindrops. Through finite element analysis of a certain type of glass plates to analyze its dynamic behavior, the structure of the ultrasonic device we determined to get the optimal performance. A supplemental metal plate was attached to the glass plate for uniform cleaning. Based on the theoretical results, experimental samples were fabricated and evaluated with various dimensions of the glass plate and the piezoceramic vibrator. Driving circuit for the dehumidifier made use of the frequency sweeping technique to keep track of the resonant frequency of the glass plate that was variant with environmental conditions.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.9 no.1
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• pp.1-9
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• 2015

This paper reviews trends of the rehabilitation welfare devices on the basis of products and markets. Latest assistive devices tend to have a fold function. Auxiliary power assist module has been added. The completion of products has been improved. The folding function has strong relationship with portability. Specifically, various mobility devices, including foldable devices, are associated with enhanced portability. Powered auxiliary wheels and upper extremity supporting modules have entered the market. The leading-edge technology like Segway's control technology applies to two-wheel wheelchairs. The brand- new technology, lower extremity robotic exoskeleton, applies to markets. Standing wheelchairs, ramps, stair climbing assistive devices becomes more common. In addition, a combination of a variety of smart devices is being promoted to the classical assistive devices' part. Rehabilitation welfare devices can be more valuable due to nice industrial design, improved materials, and processing technology.