• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 A
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• pp.113-115
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• 1995

The calculations of the temperature rise in the armature have long been considered among some of the most important problems in the design of the rotating machine. Despite the many methods of calculation propose, very few have been used in the actual design. In most cases, These methods are inadequate for measuring a wide range of temperature distribution because of the complicated structure of the machine. In this paper, the armature is divided into seven portions, and the thermal equivalent circuit is introduced as a simulation of the armature. The test machine is 1000Kw salient-pole synchronous generator.

• The Journal of Korean Physical Therapy
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• 제13권3호
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• pp.509-527
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• 2001

The Sun's ray is composed of Infrared(49%), Visible light(40%) and Ultra violet(11%), however the ray getting to the earth is FIR(Far infrared; 60%), IR(Infrared; 20%), and UV(Ultra Violet; 20%). Human beings has utilized FIR already from time immemorial. Hershel found out Infrared for the first time. in the Industrial Revolution the Infrared and FIR had been begun to use making products. In these days, with contemporary science FIR would be begun to clear up the implication in the human body and organic compound. IR classified by wavelength three parts NlR, MIR, FIR. There is FIR which is radiated from healthy human body the wave length is 8-l4m. The human body is composed of proteins which get easily changed by a thermal factor (about 42 $^{\circ}$C over). FIR with low temperature can deeply penetrate on the human body composed things without troublesomes, since FIR has effectively operated on the human body at low temperature (35-40 $^{\circ}$C). When FlR penetrated on the human body. it would inhibit the abnormal genes and cells expression, and then information of DNA and RNA would be reexpressed for arranging DNA and RNA abnormal state. As FlR's receptors in the body, it could be presumed that N-glycosyl linkage of purine and deoxyribose, RNA splicing process, and Heat shock protein. To take the FIR which was a optimized wavewlength and strength, at first, we induced the characteristic algorithm and the computerized programing. Then we formed that the formular of optimized FIR with physical, mathematical logic and theory. especially, Plank, Kirchhoff, Wien, Stefan-Boltzmann's logic and law. In the long run, the formular was induced with integration mathematical, since we had to know the molecular wavelength. Based on the induced formular as above, we programmed the optimized FlR radiating computerized program. In this research, we designed the eletronic circuit f3r interfacing with human body to diagnosis and treatment with FIR sensor which radiated FIR wavelength optimized.

• 한국항행학회논문지
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• 제18권4호
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• pp.359-363
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• 2014

본 논문은 출력 포트 사이의 물리적인 분리와 전기적 격리도를 개선시킨 비대칭 분배기기의 설계와 성능을 나타낸 것이다. 이 분배기는 입력 포트와 연결된 두 개의 ${\lambda}/4$ 전송선로의 중앙에 격리소자 저항 $18{\Omega}$과 캐패시터 0.7 pF를 직렬로 연결하여 출력 포트 사이에 격리도를 높였고, 출력 포트가 다른 회로에 연결이 쉽도록 하는 설계 방법을 제시하였다. 이러한 설계는 출력포트의 격리도를 물리적으로 향상시켜주며, 이 분배기와 다른 회로가 연결 될 때 별도의 전송선로가 필요 없이 연결할 수 있는 특징을 갖고 있다. 이러한 특성을 확인하기 위하여 중심 주파수 2 GHz에서 4:1 비대칭 분배기를 설계하였고 측정된 결과는 반사계수가 17 dB 이상, 삽입손실은 1.5 dB 와 7.7 dB, 그리고 격리도는 18 dB 이상 특성을 얻었다. 이러한 전기적 특성은 시뮬레이션 결과와 일치함을 확인하였다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1996년도 추계학술대회
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• pp.80-85
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• 1996

The various function of the cardiovascular system(CVS) and the dynamic characteristics on each part of human body can be acquired in the electric analog circuit model. According to the performed outcome by other researchers, viscos resistance, flow inertia, and vascular compliance in the CVS are analogous to resister, inductor, and capacitor in electric circuit, so the CVS models were represented by the electric circuit models. these approaches were to propose the suitable models interest part of body and to simulate the various characteristics on the CVS. In this paper, the electric circuit model considering the characteristics of morphologic structure is represented, the parameter values of model is sotted up, and the dynamic characteristics of the the CVS is simulated using VisSim, one of the simulation tools. The observed simulation results are similar to the cardiovascular functions of nomal adults who have no heart failure. Besides, the simulation is operated to observe the pathophysiological abnomal symptoms(for example, bleeding within a certain period). The controller by baroreceptor, which is one of controllers to control the CVS, is appended in the model. and the dynamic response characteristics and the procedure to return normal state is observed in simulation when the bleeding last within a certain period.

• 한국대기환경학회지
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• 제15권4호
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• pp.475-483
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• 1999

A lab-scale test was carried out to study the reduction of electrical energy consumption in the pulsed corona discharge process for nitrogen oxides removal. The experiment was mainly focused on 1) the activation of pollution removal reactions by chemical additives and 2) the optimization of electrical circuit for the efficient energy transfer from the power supply to the corona reactor. Hydrocarbon chemical additives used in the experiment are thought to be responsible for the enhancement of the NO conversion through the chain reactions of free radicals such as, R, RCO, and RO. Electrical energy consumption per converted NO molecule has a minimum value of 17 eV when pentanol is injected. When ethylene and propylene are injected, 30 eV and 22 eV of electrical energy consumption is required for the conversion of NO molecule respectively. The ratio of the pulse forming capacitance$(C_e)$ to the reactor capacitance$(C_R)$ plays an important role in the energy transfer efficiency to the reactor. Maximum energy transfer efficiency of approximately 72% could be obtained by using the pulse forming capacitance which is 3.4 times larger than the reactor capacitance, and also the maximum NO conversion efficiency was observed with the same condition.

• 전기학회논문지
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• 제57권10호
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• pp.1861-1868
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• 2008

In this paper, Passive Telemerty RF Sensor System using Unscented Kalman Filter algorithm(UKF) is proposed. General Passive Telemerty RF Sensor System means that it should be "wireless", "implantable" and "batterless". Conventional Passive Telemerty RF Sensor System adopts Integrated Circuit type, but there are defects like complexity of structure and limit of large power consumption in some cases. In order to overcome these kinds of faults, Passive Telemetry RF Sensor System based on inductive coupling principle is proposed in this paper. Because passive components R, L, C have stray parameters in the range of high frequency such as about 200[KHz] used in this paper, Passive Telemetry RF Sensor System considering stray parameters has to be derived for accurate model identification. Proposed Passive Telemetry RF Sensor System is simple because it consists of R, L and C and measures the change of environment like pressure and humidity in the type of capacitive value. This system adopted UKF algorithm for estimation of this capacitive parameter included in nonlinear system like Passive Telemetry RF Sensor System. For the purpose of obtaining learning data pairs for UKF Algorithm, Phase Difference Detector and Amplitude Detector are proposed respectively which make it possible to get amplitude and phase between input and output voltage. Finally, it is verified that capacitive parameter of proposed Passive Telemetry RF Sensor System using UKF algorithm can be estimated in noisy environment efficiently.

• 마이크로전자및패키징학회지
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• 제8권1호
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• pp.61-64
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• 2001

VCO(Voltage Controlled Oscillator)는 통신용 단말기의 크기, 성능 및 전력 소비를 결정하는 중요한 부품중의 하나이다. 통신용 기기의 크기가 점점 작아지고 있는 추세이기 때문에 VCO도 특성의 저하없이 점점 소형화 되고 있다. VCO 모듈을 개발하기에 앞서 회로에 사용되는 수동소자(L,C,R)들에 대한 연구가 진행되었다. 이 과정에서 작은 면적을 차지하면서도 동일한 특성을 나타낼 수 있는 패턴을 고안하였고 이를 적용하였다. 자체 개발된 수동소자 library를 가지고 2차원 simulation을 시행하였고 이를 바탕으로 3차원 회로를 구성하였다. 3차원 회로 구성시 VCO 전체 특성에 크게 영향을 주는 소자들은 trimming이 가능하도록 surface 쪽으로 배치하였다. 공진기 부분에서는 저손실의 stripline 구조를 적용하여 높은 Q값을 얻을 수 있었다. 이러한 과정을 통해 2.3~2.36 GHz에서 동작하는 적층형 VCO를 개발하였다.

• E2M - 전기 전자와 첨단 소재
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• 제8권1호
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• pp.83-89
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• 1995

In this paper, the specimens-($Ba_{0.997}$ L $a_{0.003}$)Ti $O_{3}$ + xTi $O_{2}$, x=0.005, 0.01, 0.02, 0.03[mol]- were fabricated by a solid-state reaction method which is easy in microstructure control and good in mass production. Their crystalline structures and microstructures were analysed, and electrical properties were investigated. The perovskite-crystalline structure is confirmed by XRD, and it is exhibited by SEM that the grain grows with an addition of Ti $O_{2}$. Resistivity decreases with increasing sinteiing temperature, and the specimen of ($Ba_{0.997}$ L $a_{0.003}$)Ti $O_{3}$ + 0.02Ti $O_{2}$ sintered at 1350.deg. C shows the best PTC effects. The complex impedance plots exhibit the serial equivalent circuit of ( $R_{gb}$ / $C_{gb}$ ) and $R_{g}$ it is realized that PTC effect is attributed to the resistivity of grain boundary.ary.y.

• 한국전자파학회논문지
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• 제13권6호
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• pp.528-537
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• 2002

본 논문에서는 능동소자를 포함하는 마이크로파 회로의 주파수 특성을 해석하기 위하여 확장된 유한차분 시간영역법 (FDTD) 을 이용했다. R, L, C와 같은 집중소자가 전송선로에 삽입된 FDTD 집중소자 모델링을 통해 하이브리드 회로 해석에 대한 기초 연구를 수행하였고, 네트워크 모델링을 이용하여 기생 커패시턴스와 인덕턴스의 값을 추출함으로써 보다 정확한 기생, 방사, 결합까지 고려하는 FDTD만의 고유한 주파수 응답을 확인할 수 있었다. 또한 FDTD를 이용하여 모델링된 다이오드를 사용한 평형 혼합기를 설계하여 상용 회로 시뮬레이터보다 정확하고 실제적인 회로의 주파수 응답을 획득하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 춘계학술대회 논문집 유기절연재료 전자세라믹 방전플라즈마 연구회
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• pp.25-28
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• 2001

The objectives of this paper are to demonstrate the electrical degradation phenomena with Si atom's behaviors in the grainboundary of semiconducting ZnO ceramics. The ZnO ceramic devices used in this investigation were fabricated by standard ceramic techniques. Especially, $SiO_2$ were added to analyze the degradation characteristics with Si and sintered in oxygen ambient at $1300^{\circ}C$. The conditions of DC degradation test were $115{\pm}2^{\circ}C$ for 13h. Using XRD and SEM, the phase and microstructure of samples were analyzed respectively. E-J analysis was used to determine $\alpha$. Frequency analysis was accomplished to understand $R_g$ and $R_b$ at the equivalent circuit. Electrical stability improved as the amount of $SiO_2$ addition increased. This results were explain by the quantitative analysis and the line scanning method of EPMA.