MP3 플레이어를 이용한 다목적 자동방송안내 시스템 개발

오중민 김천대학교 2016 김천대학교 논문집 Vol.36 No.-

We developed automatic broadcasting system with multipurpose of water level detection and refuge warning and disaster prevention using functions of MP3 player. The system usually works while 24 hours per one day and detects water level using sensors and automatically broadcasts to camping man when water level is high at valley. Key words : disaster management, disaster prevention, automatic broadcasting system, water level sensor, MP3 player

퍼지 전류제어기를 이용한 3상 AC/DC 컨버터의 설계 기법

오중민 김천대학교 2016 김천대학교 논문집 Vol.20 No.-

In this paper, the method of Space-Vector Pluse Width Modulation(SVPWM) with Fuzzy Logic Regulator(FLR) is proposed. In a conventional SVPWM. the procedures of phase transformation and choosing PWM patterns are complex. So, it should be implemented with to reduce a calculation burden, a proposed system adopts FLR. Using a linguistic control strategy based on expert knowledge. FLR relieves the processor from a heavy computations. In simulations. the proposed system is validated.

UPS의 안정성 향상을 위한 스너브 회로용 커패시터 구조 설계 개선 연구

오중민 김천대학교 2011 김천대학교 논문집 Vol.32 No.-

To operate the large capacitor UPS (Uninterrupted Power Supply), it is necessary to improve the characteristics of capacitor of snubber circuit which is able to fit high electric power, high frequency of inverter circuit switching. This study is to improve conventional standard type of capacitor and develop the new standard series type. In experiment on allowable current, maximum allowable current of the new capacity were increased more than 30[%] compared to conventional capacitor. In experiment on charge and discharge test, change of loss on tangent ô in new capac-itor was decreased compare to conventional one. These results show that the new capac-itor is more stable type. Also, the new capacity to study in this paper in this study have improved loss tangent and kept outside temperature below 5 degrees. So it expect effect to prevent environ-mental pollutions As a result of this study, there will be lots of application for improving inverter and snubber circuit besides UPS from now on. it will apply to I I range, UPS and IH rice cooker, induction water heater, boiler, eleva-tor, electrical carand and so on. The new capacitor to study in this paper is expected toapply to the range of its potential application.

지능망을 이용한 트래픽 제어구조에 관한 연구

오중민 김천대학교 1996 김천대학교 논문집 Vol.17 No.-

We can know to play an important role for telecommunication sys-tem in information society in the future and in management/main-tenance of the most telecommunication facilities. In this paper, a new traffic control architecture is proposed by adding traffic control functions to current intelligent network sys-tem with service control mechanism. The new traffic control archi-tecture system is developed and the processing flow of traffic control informations is defined. The architecture system is applied useful to management and con-trol telecommunication traffic. And it is expected to offer significant potential benifits: improved network performance, reduced network and more efficient costs.

지능망의 동향분석

오중민,공남수,고병도,임영환,O, Jung-Min,Kong, Nam-Soo,Ko, Byeng-Do,Lim, Young-Hwan 한국전자통신연구원 1988 전자통신동향분석 Vol.3 No.4

본 고에서는 지능망의 배경, 망제공자의 역활, 지능망 구조 그리고 앞으로의 발전 방향 등에 대해 조사 분석하고, 통신 선진국의 지능망 현황 및 계획에 대해 살펴보았으며, 현재 정립되어 있지 않은 앞으로 해결되어야 할 연구 논제에 대하여 언급한다.

전화/광고사서함 서비스설비 및 개인번호서비스설비에 의해 새로운 통신설비 기능에 관한 연구

오중민 ; 백열선 김천대학교 1994 김천대학교 논문집 Vol.15 No.-

We can know to play an important role for telecommunication system in information so-ciety in the future and also in management/maintenance of the most of facility. In this paper, we propose new service system by co-working of telephone/announcement mail box service system and personal number service system in intelligent network system and by adding intelligent service function to current telecommunication system. This propo-sed service system is applied usefully to maintenance and management facility of electronic, mechanical, fire system and so on. We develop new service system and define description service system and analyze service processing flow by simulating service function.

전압품질 보상장치의 순간전압강하 검출 알고리즘

오중민, 이재영 김천대학교 2004 김천대학교 논문집 Vol.25 No.-

The recent growth in the use of impactive and nonlinear loads, elec-tronic, and medical devices sensitive to power quality has caused many power quality problems and power supply-and-demand problem. Recently, in power system, not only the reliability of the power supply but also the DVR(Dynamic Voltage Restorer), UPS, and APF are being studied more and more. Hence, in this paper, Voltage sag detection algo-rithm for voltage sag corrector is proposed. Also, simple circuit for the experimental voltage sag is introduced.

공중전화망설비를 이용한 지능망 서비스 데이타 갱신 방법에 관한 연구

오중민 ; 백열선 김천대학교 1995 김천대학교 논문집 Vol.16 No.-

We can know to play an important role for telecommunication sys- tem in information society in the future and also in management/maintenance of the most of facility. In this paper, we propose new updating methdology using tele-phone system by adding intelligent service control function to cur-rent telecommunication system in intelligent network system. This proposed service data control mechanism is applied usefully to maintenance and management facility of electronic, mechanical, fire protection system and so on. We develop new service control sysem and define prcessing flow of service control data and analyze service control processing flow by simulating service control function

경계요소법을 이용한 J-적분의 수행을 통한 응력확대계수 결정에 관한 연구

백열선 ; 오중민 김천대학교 1994 김천대학교 논문집 Vol.15 No.-

The boundary element method is applied to perform a stresses, displacements, strain energy density, etc at boundary and internal points and the stress intensity factors are compu-ted through the integral. The J-integral is the most efficient thechnique used in the dual boundary element method to solve general crack problems. This method is implemented automatically by considering a small circular contour path around each crack tip. The integration along this path relies upon the values of the elastic field at a set of internal points. Since the exact variation of the interior elastic field is built into the fundamental solution of the boundary element method, the combination of these techniques is now widely regrded as the most accurate numerical tool for the analysis of crack problems in linear elastic fracture mechanics. In this study, The boundary element method is used to determine the Stress Intensity Factors of cracks emanating from a circular hole at finite width plate subject to unixial tension. The results are compared with kitagawa &Yuuki and J.C. Newman results for cracks emanating from a circular hole in the finite plate. The results of S. L F (K) and Correction Factor F, arc Summarized as ſallow. 1) The numerical solution provides accurate results for the stress intensity factor as well as exact solution. 2) The results obtained from the above element with only a few boundary clements are quite accurate. Therefore, it seems to be demonstrated that stress intensity factors may be determined efficiently for nonlinear cracks in complicated structures. 3) The Correction Factor F is influenced by the ratio "2R/W"

공통선 신호망을 이용한 망 서비스

김지선,오중민,공남수,Kim, Ji-Seon,Oh, Joong-Min,Kong, Nam-Soo 한국전자통신연구원 1988 전자통신동향분석 Vol.3 No.2

본 고에서는 공통선 신호망을 이용한 망 서비스 및 개념 모델의 세계적인 동향을 제시하였다. 또한 앞으로 국내에서 제공 가능한 서비스 및 서비스 망구조에 대하여 개략적으로 서술한다.