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조정대(Jeongdai Jo),박경민(Kyung-Min Park),노종호(Jong-ho Noh),함영복(Young-Bog Ham),유진산(Jinsan Yoo) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
The high voltage driving system with multi-phase shifter including piezoelectric actuators comprised a driving power unit for outputting the driving power by converting input alternate current into direct current, a frequency shifting unit for supplying the direct current power and shifting or generating a frequency, a high-voltage amplification unit for amplifying the input signal outputted from the driving power unit and the frequency shifting unit into a high-voltage signal, and a phase shifting unit for shifting the phase difference of the amplified signal applied to the high-voltage amplification unit and driving plural piezoelectric actuators sequentially. The results that the operating voltage was stable, the voltage loss ratio was low and the response velocity was fast could be obtained. An experiment on performance of the high voltage driving system with multi-phase shifter designed and manufactured as above described was conducted by using a piezoelectric pump having 3 sheets of round unimorph piezoelectric actuators laminated respectively in a rectangular case. It sucks any fluid by causing the first piezoelectric actuator to shift from the inlet porter side, the phase delay of 60° causes the second piezoelectric actuator to begin to shift, and the phase delay of 120° causes the third piezoelectric actuator to begin to shift. As a result of measuring each change in the outlet flow rate of the piezoelectric pump, it was shown that the frequency-flow rate characteristic, the voltage-flow characteristic, and the load pressure-flow rate characteristic were improved.
압전액추에이터 구동을 위한 상변화방식 고전압증폭회로제작
조정대(Jeongdai Jo),함영복(Y. B. Ham),윤소남(S. N. Yun),김광영(K. Y. Kim),최병오(B. O. Choi) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The high voltage driving system with multi-phase shifterincluding piezoelectric actuators comprised a driving power unit for outputting the driving power by converting input alternate current into direct current, a frequency shifting unit for supplying the direct current power and shifting or generating a frequency, a high-voltage amplification unit for amplifying the input signal outputted from the driving power unit and the frequency shifting unit into a high-voltage signal, and a phase shifting unit for shifting the phase difference of the amplified signal applied to the high-voltage amplification unit and driving plural piezoelectric actuators sequentially. The results that the operating voltage was stable, the voltage loss ratio was low and the response velocity was fast could be obtained. An experiment on performance of the high voltage driving system with multi-phase shifter designed and manufactured as above described was conducted by using a piezoelectric pump having 3 sheets of round unimorph piezoelectric actuators laminated respectively in a rectangular case. It sucks any fluid by causing the first piezoelectric actuator to shift from the inlet porter side, the phase delay of 600 causes the second piezoelectric actuator to begin to shift, and the phase delay of 1200 causes the third piezoelectric actuator to begin to shift. As a result of measuring each change in the outlet flow rate of the piezoelectric pump, it was shown that the frequency-flow rate characteristic, the voltage-flow characteristic, and the load pressure-flow rate characteristic were improved.
차량 성능시험을 위한 Autopilot Simulator 설계 및 제작
조정대(Jeongdai Jo),김광영(K. Y. Kim),김동수(D. S. Kim),최병오(B. O. Choi),김도식(D. S. Kim) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
The Lab. simulator for conducting a performance test and a reliability test on a vehicle and components has been designed and embodied. In order to control non-linear of a vehicle, a fuzzy control algorithm, a running mode tracking algorithm and a vehicle speed control algorithm were applied to the actuator control. The vehicle controller functions were implemented; setup of the actuator, position control, the gear shift control depending upon the vehicle RPM, the serial interface function for data communication and control with the servo controller, and transmitting and receiving data. The servo controller performed the function to drive the actuator by controlling the pneumatic servo valve, and measured data information such as a position, a velocity and an acceleration as obtained through operation by means of the second differentiator and controlled a position precisely. An experimental apparatus was consisted of a dynamometer and a vehicle, and the performance and durability of the controller was verified. The Lab. simulator was mounted onto the vehicle, and the position control test and a LAP mode tracking test were conducted. It was found that the response characteristic, the tracking capability and precision of the position control were so excellent.
조정대(Jeongdai Jo),김광영(Kwangyoung Kim),김동수(Dongsoo Kim),유찬수(Chansoo Ryu) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
In this paper, it is discussed that the design and implementation of vehicle controller and servo controller. As the hardware facility, i386EX microprocessor for information recciving and signal control, 80C196 microcontroller for actuator control and data processing, and attached boards was used in implementing the Lab. simulator. The implemented Lab. simulator was verified through the process of pcrformancc test and LAP mode tracking test in the vehicle.<br/> As a result of experimentation, it was verified that the vehicle controller and servo controller could be used to the Lab. simulator and it was suitable for the controller of the vehicle control system.
조정대(Jeongdai Jo),윤소남(Sonam Yun),함영복(Youngbog Ham) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, it is discussed that the performance test and characteristics analysis of developed PZT actuator and controller. The characteristics of developed PZT actuator was verified through the characteristics test such as displacement, force, hysteresis, and frequency.<br/> Also, we were developed PZT actuator controller and it was tested by performance<br/> test on the test stand.<br/> As a result of experimentation, it was verified that the developed PZT actuator and controller could be used to the PZT actuator driver and it was suitable for the controller of hydraulic and pneumatic system.
미세접촉프린팅 공정을 이용한 유연성 유기박막소자(OTFT) 설계 및 제작
조정대(Jeongdai Jo),김광영(Kwang-Young Kim),이응숙(Eung-Sug Lee),최병오(Byung-Oh Choi),Masayoshi Esashi 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
In general, organic TFTs are comprised of four components: gate electrode, gate dielectric, organic active semiconductor layer, and source and drain contacts. The TFT current, in turn, is typically determined by channel length and width, carrier field effect mobility, gate dielectric thickness and permittivity, contact resistance, and biasing conditions. More recently, a number of techniques and processes have been introduced to the fabrication of OTFT circuits and displays that aim specifically at reduced fabrication cost. These include microcontact printing for the patterning of metals and dielectrics, the use of photochemically patterned insulating and conducting films, and inkjet printing for the selective deposition of contacts and interconnect pattern. In the fabrication of organic TFTs, microcontact printing has been used to pattern gate electrodes, gate dielectrics, and source and drain contacts with sufficient yield to allow the fabrication of transistors. We were fabricated a pentacene OTFTs on flexible PEN film. Au/Cr was used for the gate electrode, parylene-c was deposited as the gate dielectric, and Au/Cr was chosen for the source and drain contacts; were all deposited by ion-beam sputtering and patterned by microcontact printing and lift-off process. Prior to the deposition of the organic active layer, the gate dielectric surface was treated with octadecyltrichlorosilane(OTS) from the vapor phase. To complete the device, pentacene was deposited by thermal evaporation and patterned using a parylene-c layer. The device was shown that the carrier field effect mobility, the threshold voltage, the subthreshold slope, and the on/off current ratio were improved.