• Journal of the Korean Institute of Telematics and Electronics
• /
• v.27 no.8
• /
• pp.1260-1264
• /
• 1990

A voltage controlled CMOS operational transconductance amplifier (OTA), whose transconductance is directly proportional to the DC bias voltage, has been designed for many electronic circuit applications. It consists of a differential pair and three ourrent mirrors. The SPICE simulation shows that the conversion sensitivity of the OTA is 41.817 \ulcornerho/V and the linearity error is less than 0.402% over a bias voltage range from -2. OV to 1. OV. Electrically tunalble filters based on voltage controlled impedances, which are realized with OTA's, also have been designed. The SPICE simulation shows that a second-order bandpass filter, whose center frequency is 23KHz at -1. OV, has the conversion sensitivity 6.6KHz/V and the linearity error less than 0.822% over a voltage range from -2.OV tp 1.OV, Tne OTA has been laid out with the 3\ulcorner n-well CMOS design rule adopted in ISRC (inter-university semiconductor research center). The chip size was about $0.756x0.945mm^2$.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
• /
• v.3B no.1
• /
• pp.37-43
• /
• 2003

This paper proposes a soft-switching current source inverter for a photovoltaic power system. The proposed inverter has an H-type switched-capacitor module composed of two semiconductor switches, two diodes, and an LC resonant circuit. The operation of the proposed system was analyzed by a theoretical approach with equivalent circuits and was verified by computer simulations with SPICE and experimental implementation with a hardware prototype. The proposed system could be effectively applied for the power converter of photovoltaic power system interconnected with the AC power system.

• Proceedings of the KIEE Conference
• /
• 1993.11a
• /
• pp.82-84
• /
• 1993

A method for simulating general characteristics and temperature characteristics of magnetizing fixture coil of the capacitor discharge impulse magnetizer-magnetizing fixture system using SPICE is presented. This method has been developed which can aid the design, understanding and inexpensive, time-saving of magnetizing circuit. As the detailed characteristics of magnetizing circuit can be obtained, the efficient design of the magnetizing circuit which produce desired magnet will be possible using our SPICE modeling. Especially, The knowledge of the temperature of the magnetizing fixture is very important to forecast the characteristics of the magnetizing circuits tinder different conditions. The capacitor voltage was not raised above 810[V] to protect the magnetizing fixture from excessive heating. The temperature estimation method uses multi-lumped model with equivalent thermal resistance and thermal capacitance.

• BMB Reports
• /
• v.45 no.4
• /
• pp.221-226
• /
• 2012

Curcumin, a polyphenol responsible for the yellow color of the curry spice turmeric, possesses antiinflammatory, antiproliferative and antiangiogenic activities. However, anticoagulant activities of curcumin have not been studied. Here, the anticoagulant properties of curcumin and its derivative (bisdemethoxycurcumin, BDMC) were determined by monitoring activated partial thromboplastin time (aPTT), prothrombin time (PT) as well as cell-based thrombin and activated factor X (FXa) generation activities. Data showed that curcumin and BDMC prolonged aPTT and PT significantly and inhibited thrombin and FXa activities. They inhibited the generation of thrombin or FXa. In accordance with these anticoagulant activities, curcumin and BDMC showed anticoagulant effect in vivo. Surprisingly, these anticoagulant effects of curcumin were better than those of BDMC indicating that methoxy group in curcumin positively regulated anticoagulant function of curcumin. Therefore, these results suggest that curcumin and BDMC possess antithrombotic activities and daily consumption of the curry spice turmeric might help maintain anticoagulant status.

• JSTS:Journal of Semiconductor Technology and Science
• /
• v.13 no.6
• /
• pp.594-607
• /
• 2013

A new efficient analytical eye-diagram determination technique for coupled interconnect lines is presented. Two coupled lines are decoupled into isolated eigen modes; bit blocks for coupled lines, which are defined as a block of consecutive bits, are then represented with decoupled modes. The crosstalk effects within the bit blocks are taken into account. Thereby, the crucial input bit patterns for the worst case eye-diagram determination are modeled mathematically, including inter-symbol interference (ISI). The proposed technique shows excellent agreement with the SPICE-based simulation. Furthermore, it is very computation-time-efficient in the order of magnitude, compared with the SPICE simulation, which requires numerous pseudo-random bit sequence (PRBS) input signals.

• Advances in Traditional Medicine
• /
• v.9 no.4
• /
• pp.269-276
• /
• 2009

Black pepper (family Piperaceae), is called king of spices because it is one of the oldest spice and alone accounts for about 35% of the world's total spice trade. The pepper is used in Ayurvedic medicine for the treatment of various ailments particularly neurological, broncho-pulmonary and gastrointestinal disorders. Pepper has also been reported to have various pharmacological actions but recently, it is highlighted as a bioavailability enhancer. This results in higher plasma concentration of drugs, nutrients, ions and other xenobiotics, rendering them more bioavailable for physiological as well as pharmacological actions in the body. Numerous scientific studies reported that piperine; a main bioactive compound of pepper, is responsible for its bioavailability enhancing property. It's a well known fact that pepper enhances bioavailability by inhibition of microsomal enzyme system but other mechanisms are also responsible to acts as a bioavailability enhancer. The brief overview of the mechanism of action of pepper as well as its applications as bioavailability enhancer is given in the present article.

• Journal of the East Asian Society of Dietary Life
• /
• v.6 no.3
• /
• pp.393-401
• /
• 1996

This survey was carried out as part of a basic works to improve the extention of native chicken uses. A sample of 282 housewives living in the downtown area of Taegu city were examined using an original questionnaire about their awareness and uses of a native chicken. The results were as follows: The awareness for a chicken dish is significantly different according to the housewives' ages and many respondents evaluated the nutritive value of a native chicken. The housewives preferred chicken boiled plain, spice fried chicken and stewed chicken, in the order. But family members preferred chicken boiled plain, spice fried chicken and french fried chicken, in the order. The frequencies of chicken cooking and buying chicken dishes of the housewives were once permonth and they regarded a native chicken as one of traditional, health and natural foods. They appreciated the taste of a native chicken highly and recognized the price of a native chicken expensive. Also 52.5% of housewives could distinguish a native chicken from the others.

• Journal of the Korean Institute of Telematics and Electronics
• /
• v.25 no.6
• /
• pp.700-709
• /
• 1988

A new technique is proposed for switch-level logic simulation for NMOS and CMOS logic circuits. For the simple inverter the rise or fall delay time is approximated by a product of polynomials of the input waveform slope, the output loading capacitance and the device configuration ratio, the polynomial coefficients being so determined as to best fit the SPICE simuladtion results for a given fabrication process. This approach can easily and accurately be extened to the case of multiple input transitions. The simulation results show that proposed method can predict the delay times within 5% error and with a speed up by a factor of three orders of magnitude for several circuits tested, as compared with the SPICE simulation.

• Journal of the Korean Institute of Telematics and Electronics A
• /
• v.31A no.9
• /
• pp.156-163
• /
• 1994

A new circuit simulator for submicron MOS desings was developed by enhancing SPICE3. The minimum conductance stepping, source stepping and pseudo transient methods are applied to improve the convergence. and SECSPICE uses the variation rate of the node volgage in the timestep algorithm. The modified BSIM model was implemented in SECSPICE for submicron MOS designs. And it gives the powerful user environments such as graphic user environments. As the results of test using real measured device data and circuits used in real production desing, we found it gave more accurage results than BSIM and the execution speed was 1.5~2.8 times faster than SPICE3.

• Proceedings of the Korean Information Science Society Conference
• /
• 2002.10d
• /
• pp.7-9
• /
• 2002

최근 소프트웨어 사용자의 요구사항이 빠르게 변화하고 있으며, 그에 따른 소프트웨어 규모도 커지고 있다. 소프트웨어 개발 업체들은 적은 개발비용으로 사용자의 기대를 만족시키는 고품질의 소프트웨어를 단기간에 출시하고자 많은 노력을 기울이고 있으며, 소프트웨어 제품과 프로세스들에 대해서 제언하고 예측할 수 있는 능력을 확보하고자 노력하고 있다. SPICE 모델에 따른 소프트웨어 프로세스 개선은 소프트웨어 개발 업체의 개발 및 관리 문제점을 해결하는데 사용되고 있으나 개선을 위한 지침의 부족으로 개선 실행에 어려움을 보이고 있다. 이어 본 논문에서는 SPICE 모델에 따른 소프트웨어 프로세스 심사 결과의 개선 항목을 잠재적인 결함으로 간주하고, GQM 방법론에 의해서 소프트웨어 프로세스 개선을 수행함으로써 조직의 비전과 목표 프로세스 능력을 달성할 수 있도록 제안한다. 또한, 결함 제거를 위한 트리거를 구축하고, 개선 사항과 타 프로세스와의 연관성을 분석하여 효과적인 프로세스 개선을 유도하고자 한다.