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8세대 LCD 공정 장치인 온조기 Chamber의 Head Unit에 대한 열전달 및 유동해석
조대근(Dae-Geun Cho),염승원(Seung-Won Yeom),김태성(Taesung Kim),이상원(Sang-Won Lee),최재붕(Jae-Boong Choi),정인성(In-Sung Jung) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Before the photoresist exposure with ultraviolet light in a LCD panel manufacturing process, the temperature of LCD glass must remain constant. It the temperature varies, the LCD glass may bent and distort during the exposure process. The heat chamber can control and keep the temperature of the LCD glass with the proper head unit design. This head unit is designed to control air streams on the LCD glass. The control ability of heat chamber is determined by nozzle position, fluid velocity and temperature of head unit. To optimize the head unit design, we performed the heat transfer and fluid dynamic simulations on four different models. Each model has different nozzle positions and velocities. Air temperature supplied in the inlet of head unit is set to e constant. The results showed that the head unit with numerous nozzles could effectively control and constantly keep the temperature of the LCD glass within 5 minutes.
조대근(Dae-Geun Cho),김영욱(Young-Uk Kim),장병기(Byeong-Gi Jang),이강윤(Kang-Yoon Lee) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.6
In this paper, we propose a circuit that generates the power voltage of the Bi-Directional Buck-Boost Charger Controller IC among Battery Charger Systems. In order to supply a stable power supply voltage, a circuit that generates the internal system power supply voltage (AVDD) is designed using LDO. The entire system in which this circuit is used is in Charging Mode, charging the battery with USB voltage (VBUS) and Discharging Mode that charges the USB voltage with the battery voltage (VBAT). Example The Voltage Generator Circuit proposed in the paper is VBUS and VBAT with the each mode. It has a function to choose one of them. The input voltage of VBUS is 2.7 V ~ 20 V, The input voltage of VBAT supports up to 4 battery cells, and the voltage of 1 cell is 4.2 V. The generated AVDD is the power supply voltage of the control circuit of I2C and DC-DC Converter. After being applied, I2C wakes up, the DC-DC Converter starts to operate, and the Battery Charger System operates. The circuit proposed in this paper is designed in 0.13um BCD process, and the die area is 1200um x 913um.
조대근 ( Dae Geun Cho ),김경철 ( Gyeong Cheol Kim ) 대한한의진단학회 2019 大韓韓醫診斷學會誌 Vol.23 No.1
Objectives The authors feel the Qi(氣) through the training, and diagnose and treat our patients through the feeling. In order to utilize the Qi-daignosis, we try to summarize the authors's training process by examining what and how to use the Qi-daignosis. Methods The authors have gathered empirical parts of the psychological part and the various methods of training, through what they need most and how to train them. And we want to describe them in order of importance. Result First of all, with psychological sense of securit you should practice trainingy. It should be able to maintain the unity of the body through relaxation on the basis of ‘no thinking only watching’. You must concentrate your energy through concentration and strengthen your inner work. Then you can feel the flow of energy inside your body and you can feel the interaction between the outside and your body. Conclusion By doing this, you naturally begin to apply the Qi-daignosis to your patients. It is not only possible for some doctors with specific abilities. Anyone can feel the Qi(氣) through clinical training and use the Qi-daignosis.
조대근 ( Dae Geun Cho ),김경철 ( Gyeong Cheol Kim ) 대한한의진단학회 2018 大韓韓醫診斷學會誌 Vol.22 No.1
The authors are using Qi-diagnosis (integrated diagnosis by bio-energy) that is a method of diagnosis and treatment. We applied Qi-diagnosis to the main study to lay the foundation and framework for research and education about the Korean Medicine. The authors try to describe systemically and specifically the Qi-diagnosis that the authors are using in clinical diagnosis ane treatment so that anyone can use it. The authors have been able to grasp the flow of human bio-energy through years of training. It has had many effects by applying the Qi-diagnosis to patients. The steps of the bio-energy flow have become objective. And the authors have been applied to acupuncture, herbal medicine, moxibustion, bruising treatment and anthrax anesthesia in clinical through the Qi-diagnosis. Also, it is applied to the life management of patients. It is applied to arts such as music therapy and art therapy. The deeper the depth of the Qi-diagnosis, the greater the opportunity to utilize the Qi-diagnosis. The Qi-diagnosis is the origin of the korean medicine. It was able to make diagnosis and treatment correct and to establish clues that the medical problems would be solved through the Qi-diagnosis. In order to do so, the diagnostician must be able to feel the auricular flow of the body accurately and objectively. In addition, he must have a comprehensive understanding of the overall framework of medicine. As a result, diagnosis and treatment of the patient as well as general problems of the patient can be identified and advised, so comprehensive treatment is possible. And it is not only a specific person can do it, but it is a diagnostic method that anyone can take if they take the basic steps step by step.
저압공정 중 발생하는 나노입자 실시간 측정장비에 관한 연구
나정길,조대근,최재붕,김영진,김태성,Na, Jeong-Gil,Cho, Dae-Geun,Choi, Jae-Boong,Kim, Young-Gin,Kim, Tae-Sung 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.6
본 논문에서는 저압환경에서 실시간으로 나노입자를 측정할 수 있는 PBMS(Particle Beam Mass Spectrometer)의 개발에 대해 서술하였다. 개발된 PBMS의 교정을 위해 NaCl입자를 사용하였다. DMA(Differential Mobility Analyzer)를 통해 +1가로 하전된입자를 1 lpm 발생시켜 그 중 0.086 lpm을 PBMS 입구의 오리피스를 통해 분기하여 유입시켰다. DMA와 PBMS의 전류값을 비교하여 전송효율을 측정한 결과 입자의 크기에 따라 약 50$\sim$60%를 나타내었다. 또한 DMA에서 특정한 크기의 입자를 발생시켜 PBMS로 측정하였으며 그 결과는 입자크기별 농도분포와 잘 일치함을 확인할 수 있었다. In this paper, we discussed about the development of the PBMS(Particle Beam Mass Spectrometer) that can measure the nanoparticles on real-time in low-pressure processes. To calibrate this equipment, a DMA(Differential Mobility Analyzer) was used to generate NaCl particles which are charged to +1. Total aerosols flow rate was 1 lpm and 0.086 lpm of that was introduced into the PBMS through the pressure-reducing critical orifice. Transport efficiency through PBMS was 50$\sim$60 % compared to particle current for DMA and PBMS according to the particle size. Results of mesurements are in good agreement with size distributions obtained by DMA.
김영삼(Young Sam Kim),김영권(Young Guon Kim),오현주(Hyun Ju Oh),조대근(Dai Geun Joh),길도현(Doh Hyun Gill),김대일(Dae Il Kim),강준길(June Gill Kang),강승언(Seung Oun Kang),최은하(Eun Ha Choi),조광섭(Guangsup Cho) 한국진공학회(ASCT) 1999 Applied Science and Convergence Technology Vol.8 No.4(1)
표면전도 전자방출 표시장치의 표시면으로 흐르는 표시전류의 근원은 음극 표면에서 방출된 전자의 관성력에 의한 것임을 전자 운동 궤적의 계산을 통하여 확인하였다. 마이크로 이하의 전극 간격을 갖는 공면 전극구조에서 음극의 가장자리 면에서 전자의 터널링에 의하여 방출된 대부분의 전자는 동일면상의 양극 쪽으로 면전류가 흐르며, 약 10^(-3)의 비율로 표시면의 양극 쪽으로 표시전류가 흐른다. 이때의 표시전류는 표면의 양쪽 가장자리면 사이의 전기장의 굴곡에 의한 원심력에 의하여 표시면으로 방출되는 전자이다. It is confirmed that the cause of anode current in SEDs (surface conduction electron emission displays) is the inertial force of electron emitted from the cathode surface in the calculation of electron trajectory. In the fissure of sub-micron, most of electrons emitted from the area of the cathode edge flow into the coplanar anode, while some electrons are emitted into the display surface by the current ratio of 10^(-3). The later electrons are forced to fly into the display surface by the centrifugal force due to the curved electric field between top side surfaces near the fissure.