• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3193-3195
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• 1999

본 논문은 전자유도방식을 이용한 무선인식시스템을 지하매설물에 적용하였다. 설계된 시스템은 송신주파수 132KHz, 응답주파수 66KHz로서 부반송파에 의한 ASK 방식으로 쌍방향 전송방식을 채택하였다. 실험결과 지하 2m 범위까지 4800bps의 전송속도로 60km의 이동속도를 갖는 차량으로 쌍방향 통신이 가능하여 차량을 이용한 지중 매설물 위치탐지 시스템 적용에 별다른 은제점이 없었다. 따라서 본 시스템의 도입으로 방대한 도면이나 DB에 의존해야 하는 기존의 지중 매설물 관리시스템에서 벗어나 정확한 현장 데이터에 의한 효율적인 지하 매설물 탐색은 물론 쌍방향 통신에 의한 신속한 매설물 데이터의 변경으로 신뢰성 있는 지중 매설물 관리가 기대된다.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.448-454
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• 2010

Currently a KTX train of 20-car formation is 388m long and carries 931 passengers including one captain and three crews which is quite a few to cover the lengthy service area and many customers. On the other hand, if a passenger wants to talk to an attendant, he has to wait for an attendant passing by his/her seat or walk to an intercom which is placed at every other car. Any of these choices is inconvenient. So, in this paper, we presented a system design for developing an audio/visual communication system for a passenger and an attendant. The system was analyzed and designed according to the Object-Oriented methodology with UML (Unified Modeling Language). Based on a problem statement, a Use-case Diagram, Sequence Diagrams, Class Diagram, State Charts, collaboration Diagram were generated. The design will be used in system implementation to a HEMU-400X test train and to be tested.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.9
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• pp.773-778
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• 2014

Aircraft communication system which provides internal communications between pilots in an aircraft and external communications between pilots and operators in ground tower with them. It is very important equipment in terms of mission and safety. It wouldn't meet performance requirements with only functions of transmission and receiving of signals. It should provide highly clear voice quality without any noise. This paper analyzes the cause of noise during internal communications and summarizes the design changes applying single point ground concept to solve the problem. It also describes the results of fight test to verify the design changes.

• Journal of Veterinary Clinics
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• v.15 no.1
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• pp.14-21
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• 1998

Ultrasonogram for kidney, spleens liver, intestine and heart was evaluated 11 Chriu horses and 14 Thoroughbred horse. The kidney was determined at both flan and both 17th intercostal spaces. The spleen was determined at the left 13-17 intercom spacer and the liver was determined at the right 7-13 intercostal space. The heart was determined at the right 4-6 intercostal space and left 3-6 intercostal space. The length, of rig kidney at the Thoroughbred horse, Thoroughbred foul, Cheju horse and Cheju foul were 16.2, 12.6, 13.1 and 11.2 mm, respectively. The width of right kidney at the Thoroughbed horse, Thorughbred foul, Cheju horse and Cheju foul were 5.4, 4.3, 4.6 and 4.2 mm, respectively. The depth of right kidney at the Thoroughbred horsed Thoroughbred foul, Cheju horse and Chrju foul were 5.2, 4.4, 4.5 and 4.3 mm, respectively. Similar ultrasonographic measurements were obtained for the left kidney, The left ventricular end-diastolic diameter at the Thoroughbred horse, Thoroughbred fouls Cheju horst and Cheju foul were 107, 83, 85 and 73 mm, respectively. The left ventricular end-systolic diameter were at the Thoroughbred horse, Thoroughbred foul, Cheiu horse and Cheiu foul were 63, 52, 53 and 45 mm, respectively. Also, the interventricular septum in end-diastole, interventricular septum in end-systoles left ventricular wall end-diastoles left ventricular wall end-systoles right ventricular end-diastole diameter, aorta and left atrium at t Thoroughbred horse, Thoroughbred foul, Chriu horse and Chriu foul were measured. Experimental renal stone and enterolith of colon were observed by ultrasonography.