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다수의 CCFL 구동을 위한 고역률 인버터 회로의 설계
김철진,박정오,박현철 한라대학교 2009 論文集 Vol.12 No.-
This paper presents an architecture for driving multiple paralleled cold cathode fluorescent lamps (CCFLs) for back lighting applications The key architecture is a proposed capacitive coupling approach for lamp ignition and paralleled multiple CCFL operation This system is consist of a flyback converter a single inverter to drive multiple lamps and conductive floating reflector The topology is capable of driving a number of parallel lamps with independent accurate lamp Leakage inductance and stray capacitance is used for the capacitive coupling So some advantages are achieved such as improved current regulation cost effectiveness and significant size and weight reduction compared to typical high frequency ac ballast The successful ignition and stable operation is verified from experimental results with ten parallelled CCFLs And this paper proposed a high power factor correction with the passive and active PFC that was satisfied with the IEC rules
Kim, Seung-Joo,Im, Jong-Bin,Go, Sung Chul,Bae, Jae-Nam,Kim, Won-Ho,Kim, Kwang-Soo,Kim, Cherl-Jin,Lee, Ju IEEE 2010 IEEE transactions on magnetics Vol.46 No.6
<P> This paper presents the control method that inverter output keeps to linear to reference voltage of Synchronous Reluctance Motor (SynRM) using DC Link voltage Synthesis. This method is reduced torque ripple considering parameters with magnetic saturation. To estimate parameters of inductances for SynRM, the proposed method uses recursive least square (RLS) estimation algorithm. The estimated inductances are used for calculating torque and DC link voltage. The Inverter output voltage cannot be displayed to linear about inverter reference voltage if Real DC Link voltage is different from DC Link voltage of PWM amplitude. Also, the over-modulation is linearity broken if reference voltage is out of range. Torque ripple generates the vibration and noise of a motor. This paper proposes the control method so that the torque ripple decreases and the linearity of inverter output keeps using the DC Link voltage Synthesis. The proposed control method is verified by computer simulation and experiment. </P>
Inhibitory Effects of Silsosangami on the Platelet Aggregation
Kim, Jong Soo,Kim, Beob Jin,Kim, Han Geu,Ahan, Jong Chan,Lee, Soo Kyung,Chung, Tae Wook,Choi, Dall Yeong,Kim, Cherl Ho,Park, Won Hwan 대한동의생리학회,대한동의병리학회 2002 동의생리병리학회지 Vol.16 No.4
The thrombosis importantly came to the front as the risk factor of these circulation system's disease. SilsoSanGami(SSG) was used for investigating the inhibitory effect on platelet-activating factor-induced platelet aggregation about drugs that used to improvement various symptoms created by the thrombosis in oriental medicine. In this study, the water-extracted SSG was investigated for its possible antithrombotic action on platelets. The antithrombotic activity of water-extracted SSG was deduced from its ability to suppress platelet aggregation, ATP-exocytosis, and the generation of prostaglandin E_2 and thromboxane A_2 by human platelets, stimulated with arachidonic acid. Water-extracted SSG dose-dependently suppressed the aggregation of human platelets, the release of endogenous ATP, and the formation of PGE_2 and TXB_2, both the latter usually detected to estimate the activity of COX and TXS, respectively. Since the IC_50 values necessary to inhibit COX (115 ㎍/㎖ SSG) and TXS(74 ㎍/㎖ SSG) were in the same range, inhibition of COX is suggested to be the primary target of water-extracted SSG, thus suppressing the formation of PGE_2 which is metabolized by TXS to TXA_2. We considerated that SSG has practical applicational value of clinical trial in the thrombosis caused by platelet aggregation.
Characteristics of a High Power Factor Boost Converter with Continuous Current Mode Control
Kim, Cherl-Jin,Jang, Jun-Young The Korean Institute of Electrical Engineers 2004 KIEE International Transactions on Electrical Mach Vol.b4 No.2
Switching power supply systems are widely used in many industrial fields. Power factor correction (PFC) circuits have a tendency to be applied in new power supply designs. The input active power factor correction (APFC) circuits can be implemented in either the two-stage approach or the single-stage approach. The two-stage approach can be classified into boost type PFC circuit and dc/dc converter. The power factor correction circuit with a boost converter used as an input power source is studied in this paper. In a boost power factor correction circuit there are two feedback control loops, which are a current feedback loop and a voltage feedback loop. In this paper, the regulation performance of output voltage and compensator to improve the transient response presented at the continuous conduction mode (CCM) of the boost PFC circuit is analyzed. The validity of designed boost PFC circuit is confirmed by MATLAB simulation and experimental results.
Kim Cherl-Jin,Choi Chul-Yong,Baek Soo-Hyun The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Electrical Mach Vol.b5 No.1
Various kinds of practical machines using the single phase induction motor (SPIM) are utilized to control both speed and torque. In particular, the capacitor-run type SPIM has the characteristic that allows the motor torque to be altered by auxiliary capacitance variation. In this study, we manifest an equivalent model having a more simplified configuration, and clarify the relationship between torque and capacitance. Also, we design an experimental controller that is able to perform speed control with ease by the phase angle control of the AC input voltage. Validity of this study is confirmed through the simulation and experimental results obtained.
Circuit Design and Performance Analysis of CCFL Dimming Controller With Frequency Modulation
Kim, Cherl-Jin,Ji, Jae-Geun,Yoon, Shin-Yong The Korean Institute of Electrical Engineers 2004 KIEE International Transactions on Electrical Mach Vol.b4 No.4
The CCFL dimming control methods are generally used lamp current regulation or average current adjustment method feeding the CCFL inverter. Inverter operation frequency is higher than resonant frequency for safe operation. In this study, we design the half-bridge type series and parallel resonant converter circuit that switches at variable frequency modulation methods to control the output power. This method has advantages such as low EMI and reduced harmonics, and it is convenient for dimming control using a microprocessor. The validity of this study is confirmed from the simulation and experimental results.
Kim, Joon Mee,Sohn, Jin Hee,Cho, Mee-Yon,Kim, Woo Ho,Chang, Hee Kyung,Jung, Eun Sun,Kook, Myeong-Cherl,Jin, So-Young,Chae, Yang Seok,Park, Young Soo,Kang, Mi Seon,Kim, Hyunki,Lee, Jae Hyuk,Park, Do Yo Springer Japan 2016 GASTRIC CANCER Vol.19 No.4
<P><B>Background</B></P><P>Discrepancies in the clinicopathologic parameters pre- and post-endoscopic submucosal dissection (ESD) sometimes necessitate additional surgical resection. The aim of this study was to assess such discrepancies in clinicopathologic parameters before and after ESD in the context of reducing the risk of failure of curative ESD.</P><P><B>Methods</B></P><P>Data on 712 early gastric cancer patients were prospectively collected from 12 university hospitals nationwide. The inclusion criteria were differentiated carcinoma <3 cm in size, no ulceration, submucosal invasion <500 μm, and no metastasis. Clinicopathologic factors were compared retrospectively.</P><P><B>Results</B></P><P>The discrepancy rate was 20.1 % (148/737) and the most common cause of discrepancy was tumor size (64 cases, 8.7 %). Ulceration, undifferentiated histology, and SM2 invasion were found in 34 (4.6 %), 18 (2.4 %), and 51 cases (6.9 %), respectively. Lymphovascular invasion (LVI) was observed in 34 cases (4.6 %). Cases with lesions exceeding 3 cm in size showed more frequent submucosal invasion, an elevated gross morphology, and upper and middle locations (<I>p</I> < 0.05). In the cases with ulceration, depth of invasion (DOI) was deeper than in the cases without ulceration (<I>p</I> = 0.005). Differentiation was correlated with DOI and LVI (<I>p</I> = 0.021 and 0.007). DOI was correlated with tumor size, ulceration, differentiation, LVI, gross type, and location. There were statistically significant differences between mucosal cancer cases and submucosal cancer cases in tumor size, differentiation, ulceration, LVI, and location.</P><P><B>Conclusions</B></P><P>The overall discrepancy rate was 20.1 %. To reduce this rate, it is necessary to evaluate the DOI very cautiously, because it is correlated with other parameters. In particular, careful checking for SM-invasive cancer is required due to the high incidence of LVI irrespective of the depth of submucosal invasion.</P>
A Study on the Modeling and Design of Single Phase Induction Generators
Kim Cherl-Jin,Lee Kwan-Yong The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Electrical Mach Vol.b5 No.4
With increasing emphasis on non-conventional energy systems and autonomous power generation, development of improved and appropriate generating systems has recently taken on greater significance. This paper describes the performance analysis of a single phase self-excited induction generator (SEIG), suitable for autonomous/standby power systems. The system is also appropriate for wind energy systems and small portable systems. Both windings of the induction machine, the main and the auxiliary, are utilized. One winding will be devoted to the supply excitation current only, by being connected to the excitation capacitor, while the load is connected across the other winding. As the design of excitation, the minimum of self-excited capacitor connected auxiliary winding is determined as the suitable value using a circuit equation of auxiliary winding. For the steady state analysis, the equivalent circuit of the single-phase induction generators is used as a basis for modeling using the double-revolving field theory. The validity of the designed generator system is confirmed by experimental and computed results.