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홍국태,이성대,정강민 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.1
In this paper, a high speed, high accuracy sample and hold circuit that minimizes the hold step error by using a new circuit architecture is proposed. This new sample-and-hold scheme takes advantages of the speed of the open loop sample-and-hold circuit in the SAMPLE time and the cancellation of charge injection in the HOLD time. It operates above 50MHz with 0.3mV hold step error.
디지탈 위상 검출기에서의 Metastability 향상에 관한 연구
홍국태,이성대,정강민 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2
This paper shows our study on memory phase detectors, ie digital phase detectors using flipflops. For the purpose of improving metastability performance and delay performance, structure of circuits was designed to have better metastability and aspect ratio was controlled in order to give better delay performance.
洪國泰,李成大,鄭康敏 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.2
In this paper, a programmable high-sample-rate FIR digital filter was designed for a highbandwidth communication system. A fully parallel bit-level pipelined transpose-form carrysave architecture using CSD coefficients was adopted for high-speed operation. In this system, multiplication can be translated to simple shift-addition processes. For programmability of filter coefficients, two decoders and a few registers are added, and the shifting processes of input data are controlled according to the data registered. Therefore, the speed performance of the designed filter is comparable to the case of a non- programmable filter.
양한유,홍국태,정강민 成均館大學校 科學技術硏究所 1992 論文集 Vol.43 No.2
본 연구는 외부조건의 영향을 적게 받고 일정한 전류를 발생시켜 주는 CMOS 전류표준 회로를 설계하였다. 이 회로에서 기존에 통상 사용되어 왔던 PTAT 전압원 대신에 특히 온도변화에 독립적인 구조로서 부동전압원에 CMOS 전압표준을 사용한 구조를 제시하였다. 이로서 회로의 정확성, 간결성을 향상시킬수 있다. 시뮬레이션을 통하여 회로의 작동을 검증하고 성능을 토의 하였다. In this work, a CMOS current reference circuit is designed, which is independent of variations of external parametters. A circuit configuration using CMOS voltage reference is suggested and it is shown that this circuit is less sensitive, especially to the temperature variations, compared to the PTAT voltage source. Through simulations, the operation of the circuit is verified and its performance is discussed.
Cisplatin 병용화학요법시 발생한 오심, 구토에 대한 Ondansetron과 Metoclopramide의 효과에 대한 비교
김미자,국기용,김태원,박유환,김완중,허경,정춘해,홍순표 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1
Inspite of possible effects for emesis following chemotherapy including cisplatin, nausea and vomiting are the most unpleasant side effects of cancer chemotherapy. None of the currently available antiemetic agents is entirely effective preventing emesis. Ondansetron, a 5-HT(5-hydroxytryptamine)_(3) receptor antagonist, has been shown to be effective antiemetic agent in the control of cisplatin induced emesis. Twenty solid tumor patients who are scheduled to receive cisplatin containing combination chemotherapy participated in a prospectively randomized study to compare the antiemetic efficacy and safety of ondansetron and metoclopramide. Ondansetron was given in dose of 8mg intravenous 30min before cisplatin and then 4hours and 8hours after cisplatin on day 1, and Ⅰ.Ⅴ. every 8hours from day 2 to 5. In the metoclopramide group, metoclopramide was given in dose of 2 ㎎/㎏ intravenous every 8hours from day 1 to 5. The control of emesis was graded in the following way : complete response, no vomiting : major response, 1-2 emetic episodes : minor response, 3-5 emetic episodes : failure, above 5 emetic episodes. Complete or major response of emesis was achieved 10 of 12(83.2%) patients receiving ondansetron and in 5 of 8(62.5%) patients receiving metoclopramide, but effectiveness was not significantly different. Ondansetron was at least as effective as metoclopramide therapy in controlling cisplatin induced emesis. Side effects in ondansetron was less than in Metoclopramide.
김성수,최현교,박홍채,김태옥,서봉국 한국환경과학회 2000 한국환경과학회지 Vol.9 No.4
To improve CO_2 permselectivity, a modified silica membrane was prepared by chemical vapor deposition with tetraethoxysilane(TEOS)-ethanol-water, and TEOS-ethanol-water-HCI solution at 300-600℃. The silica was effectively deposited in the mesopores of a γ-alumina film coated on a porous α-alumina tube by evacuating the reactants through the porous wall. In this membrane, CO_2 interacts, to some extent, with the pore wall, and CO_2/N_2 selectivity then exceeds the value of the Knudsen diffusion mechanism, while the membrane derived from TEOS alone has no CO_2 selectivity. The silica membrane prepared from TEOS-ethanol-water-HC1 solution showed that CO_2 permeance was 2.5×10 exp (-7)㏖/s^-1. m^-2. Pa^-1 at 30℃ and CO_2/N_2 selectivity was approximately 3. The CO_2 permeance and selectivity was improved by enlarging the surface diffusion with modification of chemical affinity of the silica pores.
A HIGH-SPEED PROGRAMMABLE FIR DIGITAL FILTER USING SWITCHING ARRAYS
Hong, Kuk Tae,Yi, Sung Dae,Chung, Kang Min 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1
In this paper, we propose a programmable tap structure used in a programmable FIR digital filter for high-frequency communication system, which speed performance is comparable to the case of a non-programmable filter. A fully parallel bit-level pipelined transposed-form carry-save architecture using CSD coefficients was used to achive high-sample rate FIR digital filter. For realization of programmable filter coefficients, two decoders and some registers were added, and these registered data controlled the shifting process of input data using switch arrays.
Anastomotic Sealing Effect of Tissue Adhesives on Technical Failure of Colonic Anastomosis
Tae Doo Jung,Jung Min Kim,Jae Ho Shin,Min Sung An,Tae Geun Ha,Kwang Hee Kim,Ki Beom Bae,Tae Hyeon Kim,Chang Soo Choi,Kwan Hee Hong,Soo Jin Jung,Sun-Hee Kim,Kuk Hwan Rho 대한외과학회 2011 대한외과학회 학술대회 초록집 Vol.2011 No.11
Woo Sung Hong,Jun Min Lee,Hong Chung,Tong-Wook Kim,Sang-Kuk Yang,Hong Sup Kim,Tae Ui Lee 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.2
Although prosthetic materials are commonly used to repair abdominal wall defects, they are also associated with postoperative complications. These complications could be prevented by the adoption of uniform guidelines on surgical methods and materials, but the best anatomical position for placement of prosthetic meshes is unclear. We report a case of an enterocutaneous fistula that developed after an abdominal wall defect was repaired by intraperitoneal application of a prosthetic mesh (Marlex<SUP>ⓡ</SUP>) to raise awareness of the consequences of improper use of prosthetic materials.