유도형 리니어 모터

조윤현(曺允鉉),손영대(孫永大) 대한전기학회 1999 전기의 세계 Vol.48 No.2

젊은 여성에서 발생한 초기 자궁내막암의 고용량 progestin의 치료효과

조윤현,권용순,김대연,김종혁,서대식,김용만,김영탁,남주현 대한산부인과학회 2006 대한산부인과학회 학술대회 Vol.92 No.-

항공이 동통신환경에서 항공교통량에 따른 우선순위 할당 알고리즘에 관한 연구

조윤현,김용균,김상욱,박효달 한국ITS학회 2010 한국ITS학회논문지 Vol.9 No.1

최근 항공교통량의 증가에 따라 보다 효율적인 항공교통흐름제어가 요구되고 있다. 이에 본 논문에서는 효율적인 항공교통흐름제어를 위한 알고리즘을 제안하였다. 항공통신 환경은 일반 통신 환경과는 다르게 스테이션(항공기) 사이에 직접적인 통신 기능이 필요하며, 안전성을 위한 메시지의 우선순위가 매우 엄격하게 요구된다. 게다가 넓은 서비스 지역은 높은 전파지연을 발생시킨다. 본 논문에서는 기존의 CSMA/CA 매체접속제어(MAC) 프로토콜을 사용하여 항공교통상황(혼잡 공항 지역, 접근관제구역, En route구역, 대양 항행)에 따라 메시지 우선순위를 설정하고, 이러한 우선순위가 높은 메시지가 보다 더 높은 접속 확률을 갖고 데이터를 전송하도록 하였다. 항공기 대수에 따른 시뮬레이션 결과, 교통량이 증가할수록 기존 방식보다 더 높은 채널 사용 효율 및 전송확률을 가짐을 확인하였다. According to the recent increase in air traffic a more efficient air traffic flow control is required. This paper proposes the algorithm for efficient air traffic flow control. Aeronautical communication environment is different from the common communication environment since it needs a direct communication between stations (or airplanes) and requires a strict priority for safety message. Moreover, the wide area for basic service causes high propagation delay. In this paper, by using existing CSMA/CA Media Access Control (MAC) protocol, we set the message priorities according to air traffic condition (congestion airport area, approach control area, En route area, and ocean area). This prioritization scheme enables the data transmission with higher access probability. Simulation results confirm that our protocol shows better performance in terms of channel efficiency and success probability compared to exisiting CSMA/CA protocol.

무인항공기의 매체접속제어 프로토콜 적용에 관한 연구

조윤현,윤인섭,박효달,김상욱 한국전자통신학회 2016 한국전자통신학회 논문지 Vol.11 No.1

In this paper, studied on MAC(Media Access Control) protocol for UAVs application. As an increasing the number of UAVs, at the same time need to control the number of UAVs on the ground control station is also increased. So, CSMA/CA that used in current civil aircraft applied to UAV communications and verified the applicability. And changes message sizes, then compare the throughput and delays of data. In the results, we confirmed applicability for UAVs MAC protocol. 본 논문에서는 점차 쓰임새가 다양해지는 무인항공기의 매체접속제어 프로토콜 적용에 관한 연구를 수행하였다. 무인항공기의 대수가 증가함에 따라 지상통제소에서 동시에 제어해야할 항공기의 대수도 증가하게 된다. 이를 위해 현재 민간항공기에서 사용하는 다중접속제어 방식인 CSMA/CA를 무인항공기 통신방식에 적용하여 이의 적용 가능성을 확인하였으며, 메시지 크기를 달리하여 데이터의 처리량 및 지연시간을 비교하였다. 그 결과 무인항공기 매체접속제어 적용가능성을 확인해볼 수 있었다.

Matlab/Simulink를 이용한 횡자속형 SRM의 동특성해석 알고리즘

조윤현,김경호 동아대학교 정보기술연구소 2001 情報通信硏究所論文誌 Vol.8 No.2

The paper is proposed the characteristics analysis algorithm for a Transverse type Switched Reluctance Motor(TSRM) considering the nonlinear magnetic phenomena. To investigate the non-linearity parameters of magnetic equivalent circuit, the designed TSRM is analyzed by the 2D and 3D finite element method as functions of input current and angular displacement. On the base of FEM analysis results, the current, torque, back EMF and output power wave of TSRM are simulated from the motion equation by MATLAB/Simulink. The simulated performance characteristics for a 4-phase, 24-pole TSRM are verified by experiments on a prototype.

X-Y Table 구동형 선형펄스모터의 설계 및 특성 고찰

조윤현 東亞大學校 附設 情報通信硏究所 1996 情報通信硏究所論文誌 Vol.4 No.1

The linear pulse motor is essentially a digital device with one step of input for each input current pulse. The input pulses are supplied through power electro devices such as power transistors and FETs switched by digital controllers. linear pulse motors are finding a wide range of application for the Factory-Automation or the Office-Automation.. Typically, LPM provides for a reliable and precise control of position, velocity, or acceleration without using a closed-loop system. Thus some of the advantages of LPMs are ease of control, step multiplication, static and dynamic positioning, and locking force. In order to develope a LPM and its controller for X-Y table application, this paper presents a single-sided linear pulse motor with two permanent magnets. To analyze the characteristics of LPM which is composed of the permanent magnets and irons, the flux density, the thrust and normal force etc. are calculated by the F. E. M and magnetic equivalent method which is considered the magnetic saturation phenomena. The position and velocity of LPM are controlled by using the 80C196KC micro-processor.

Hybrid 엔진용 유도기의 설계 및 특성 고찰

조윤현 東亞大學校 大學院 1996 大學院論文集 Vol.21 No.-

This paper presents the design and characteristics analysis of induction machine for diesel-electric hybrid vehicle powertrain. diesel-electric hybrid vehicles are very efficacious in reduction of consumption energy, environment pollution and saftly yields with high dynamic ofr machines. However, their sophisticated construction requires from designers both complex made-technology and control strategy which would be able to put into practice this requirements. These problems are still considered in processing the design and analysis of induction machine. The requirements for a given volume, input power to weight ratio, high efficiency and wide speed range are met by the induction machine. The three phase induction machine with 12-pole, the maximum power, 34Kw and the maximum speed, 2300rpm is designed and manufactured. To investigate performance characteristics of the induction machine, the magnetic flux density is analyzed by the 2-dimensional F.E.M. and its performance is tested using the M-G dynamic tester. The experimental values are compared with the simulation ones. As a result of this work, it is found that good performances in terms of the efficiency, the primary current and the torque is obtained in the operation region of hybrid car, but no good performance occurs around the maximum speed region.

Permanent Magnet의 형상에 따른 BLDC 전동기의 특성해석

조윤현,김경호,최거승 동아대학교 생산기술연구소 2001 生産技術硏究所硏究論文集 Vol.6 No.2

This paper is studied he characteristics of current harmonics and the torque ripple of Blushless DC (BLDC) motor according to the permanent magnet shape of rotor and the input voltage waveform. Its motor is developed for the fan blower of automatic vehicles. To investigate the torque ripple, the phase current harmonics, the flux density distribution of BLDC motor are analysed by F.E.M and its analytical results is compared to the experimental results. Especially, a transient state torque of BLDC motor fed with a sinusoidal and a PWM wave voltage is estimated to obtain the dynamic characteristics of BLDC Motor.

System identification technique for control of hybrid bio-system

조윤현,허훈 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.12

Effective and accurate system parameters in physical system are crucial for the analysis and prediction of dynamic performance and to conduct control. A hybrid bio-system combined using solid and flexible bio-elements is adopted as the target system in this study. Each individual system has its own nonlinearity in nature. A flexible muscle is represented using a Hill-type model. In addition, the hybrid dynamic system exhibiting nonlinearity is modeled using the Hammerstein-Wiener model. These nonlinearities are characterized through piecewise linear approaches. The dynamics and control performance of the systems using the proposed nonlinear system identification are compared with those of linear system identification. Simulation results show the feasibility of the proposed nonlinear system identification technique in extracting effective system parameters with a varying piecewise linearity. Moreover, the possibility of bio-system control is qualitatively revealed. A sequential PID control scheme also shows its successful performance for a hybrid bio-system.

횡자속형 Rleuctance Motor의 특성해석 알고리즘 개발

조윤현,김경호,김명수 동아대학교 생산기술연구소 2001 生産技術硏究所硏究論文集 Vol.6 No.2

This paper is proposed the modeling and computational methods for estimating the steady and dynamic characteristics of a transverse flux type SRM. To obtain characteristics parameters of the transverse flux type SRM which is considered the magnetic non-linearity phenomena, the magnetic equivalent parameters of SRM are computed by the finite element method as functions of the input current and angular displacement. Dynamic characteristics of the designed transverse flux type SRM is simulated and estimated by Matlab/simlunk.