정확한 Closed-Form 그린함수를 이용한 코플래너 도파로 불연속 해석

강연덕,송성찬,이택경 한국항행학회 2003 韓國航行學會論文誌 Vol.7 No.2

실수축 상의 적분 방법에 의한 정확한 closed-form 그린함수를 이용하여 코플래너 도파로의 불연속에 대한 공간영역 full-wave 해석을 하였다. MPIE(Mixed Potential Integral Eqution)를 풀기 위한 수치계산 방법으로는 삼각형 요소를 이용한 갤러킨 방법을 사용하였다. 경계면에서 삼각형 요소상의 기저함수로는 선형함수를 사용하였으며, 관측점과 전원점이 일치하는 특이점 근방의 적분 계산을 위해 면적분을 선적분 형태로 바꾸어 피적분 함수의 특이점이 사라지도록 하는 해석적인 방법을 사용하였다. 실수축 적분방법에 의한 그린함수를 이용함으로써 불연속에 대한 정확한 특성을 구하였다. By using accurate closed-form Green's functions obtained from real-axis integration method, the full-wave analysis of CPW discontinuities are performed in space domain. In solving MPIE(Mixed Potetial Integral Equation), Galerkin's scheme is employed with the linear basis functions on the truangular elements in air-dielectric boundary. In the singular integral arising when the observation point and source point coincides, the surface integral is transformed into the line integral and the integral is evaluated by regular integration. By using the green's function from the real-axis integration method, the discontinuities are characterized accurately.

세포외 기록용 차동증폭기

이강준,김현택 한국심리학회 한국심리학회지 생물 및 생리 Vol.5 No.1

단단위 활동(single unit activity: SUA) 및 다단위 활동(multiple unit activity: MUA)을 기록할 수 있는 증폭기를 소개한다. 증폭기는 최첨단 증폭기와 후단 증폭기로 분리되어 있으며 두 부분 모두에서 높은 동상신호 제거비를 얻기 위해 차동증폭회로가 사용되었다. 높은 입력임피던스를 얻기 위해 접합형 전계효과 트랜지스터가 사용되었다. 후단 증폭기에는 또한 여파기와 완충증폭기를 삽입하여 원하는 주파수대의 뉴런활동을 선별할 수 있도록 하였다. 본 증폭기는 고입력 임피던스, 저잡음, 광대역 증폭 특성을 지닌 기기로서, 금속 전극을 사용한 다단위 기록과 미세유리관 전극을 사용한 단단위 기록에서 만족한 성능을 보였다. An amplifier was designed for extracellular recording of unit activity. It consists of a head stage amplifier and a postamplifier. The head stage amplifier and the postamplifier have differential input circuits. The amplifier had a high common mode rejection ratio(CMRR), well-defined gains, a low noise character, and a wide dynamic range. Multiple unit activity(MUA) and single unit activity(SUA) could be recorded satisfactorily in animals with the chronically implanted metal electrode and with the acute micropipette electrode in the brain.

촉매 코팅방법에 따른 기능성 여과포의 NO 제거 반응 특성

강민필,송윤섭,이효송,김상도,박영옥,황택성,이영우 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6

NO_x와 먼지 동시 제거용 기능성 여과포 개발의 일환으로 V_2O_5/TiO_2계열의 상용촉매를 사용하여 P-84, Nomex, PTFE 여과포에 코팅하였다. 사용된 코팅 방법은 Sol-gel법, Spray법 그리고 Dip코팅 방법이었으며 코팅방법이 여과포의 NO_x 제거반응에 미치는 영향을 조사하였다. NO_x 제거반응실험은 여과포의 작동온도에 맞는 100-250℃의 반응온도범위에서, 공간속도 5,000hr^-1, 산소농도 6%, NH_3/NO 몰비는 1.0의 조건하에서 수행되었다. 본 연구에서 시도된 세 가지 코팅 방법 중 촉매량의 조절 및 균일한 코팅이 용이한 Sol-gel법에 의해 제조된 기능성여과포가 가장 좋은 NO_x 전환율을 나타냈다. A series of fabric filters including P-84, Nomex and PTFE were coated with a commercial V_2O_5/TiO_2 catalyst as an effort to develop a functional fabric filter of simultaneous removal of dust and NO_x. The coating methods employed are solgel coating method, spray coating method and dip coating method, and the effects of coating method on NO_x removal performance of functional fabric filter were investigated. Experimental conditions are as follows: the temperatures of 100-250℃ which are the normal operating temperature range of fabric filters, the space velocity of 5,000hr^-1, the oxygen concentration of 6%, and the NH_3/NO ratio of 1.0. Results showed that the sol-gel coating method gave the best NO_x removal performance mainly due to its ability in controlling the amount of catalyst and uniform coating.

포기/비포기 시간비가 활성슬러지 floc의 특성에 미치는 영향

김강호,문병현,이택순,서규태 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1

Many researches on SBR(Sequencing batch Biological Reactor) for the removal efficiency of contaminants and effects of operation mode in effluent have been conducted. However, little studies for the characteristic of biological floc affected by operation mode have been made. The purpose of this study is to compare the effect factors on the removal efficiency of nitrogen and phosphorus in SBR system. And also it is to look for new information on the size and characteristics of biological floc by changed aerobic/anaerobic time ratio. Results shown that the removal efficiency of organic matter, nitrogen and phosphorus was higher in the operation mode of higher aerobic/anaerobic time ratio. The floc size and fractal dimension produced in higher aerobic/anaerobic time ratio were larger. These result implied that the settling characteristics of floc could be produces in the operation mode of higher aerobic/anaerobic time ratio.

태양광 발전시스템을 위한 계통 연계형 PWM 인버터의 변조지연 보상

성낙규,한경희,강승욱,이승환,유택빈 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-

Since the residential load is an AC load, while the output of solar cell is a DC power, the photovoltaic system needs the DC/AC converter to utilize solar cell and must provide the sinusoidal wave current and voltage, at unity power factor in the case of driving to interact with utility line. PWM modulator must do stable modulation even though it contains the disturbance like a distortion and noise, and it needs compensation method, because there is a timing interval between sampling points and carrier waves, while the synchronous signal is controlled by the micro processor. In this paper, we maximaze output of solar cells which is propotional to variation of insolation, using single phase PWM voltage source inverter, and we can drive in high power factor with utility line by control and compensation method which is concerned with synchronous signal distortion and modulation delay, using low pass filter and phase shifter.

디지탈 통신 학습 시뮬레이터

송현교,김연구,이택희,강민구 호남대학교 정보통신연구소 1995 정보통신연구 Vol.4 No.-

본 논문에서는 실제 통신망에서 발생할 수 있는 데이타 전송과정을 컴퓨터상에 시뮬레이션하는 프로그램으로서, PC의 WINSOW 환경하에서 Visual-Basic을 활용하여 통신신호의 흐름과정을 하나의 화면에서 구현하도록 부호화와 변조파형을 표현하고 이 신호의 복조와 복호과정을 시뮬에이션한다. 아울러 통신채널에서 발생하는 랜덤오류를 제어하는 오류정정을 포함함으로서 통신이론을 이해하고 학습하는데 많은 도움이 될 수 있도록 통신신호에 대한 그래픽 처리에 목적을 둔다. In this thesis, the graphic signal for communication is presented in the WINDOW using `Visual-Basic'. All signals of PCM encoding/decoding and modulation/demodulation are processed in the same picture. Especially, error control schemes which are parity check, longiudinal redundancy check, cyclic redundancy check, are described for more reliable communication.

재발 또는 불응성 비호즈킨 림프종 환자에서 CDME 구제항암화학요법 후 고용량 항암화학요법 및 자가말초혈액 조혈모세포이식의 효과

김세형,한강원,배상병,김찬규,이남수,이규택,박성규,원종호,홍대식,박희숙 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.1

Background and objectives : The long-term survival in patients with non-Hodgkin's lymphoma (NHL) after conventional dose chemotherapy is about 35% and the rest of the patients tend to have relapse. So, in relapsed or refractory NHL, we compared the outcome of patients undergoing high-dose chemotherapy with autologous peripheral blood stem cell transplantation(APBSCT) with only salvage chemotherapy of cisplatin, dexamethasone, mitoxantrone, and etoposide(CDME). Materials and methods : From June 1993 to December 1999, 25 patients with relapsed or resistant NHL were treated with CDME regimen as salvage chemotherapy. Twelve patients were received four cycles of CDME chemotherapy, and 13 patients were received high-dose chemotherapy with APBSCT following two cycles of CDME chemotherapy. Results : The median follow-up duration was 12.8 months(range:4-68). The overall response rate was 41.7% (complete response rate 25%, partial response rate 16.7%) in 12 patients with CDME only. Thirteen patients who were treated with high-dose chemotherapy with APBSCT achieved 61.5% complete response rate and 15.4% partial response rate, with an overall response rate of 76.9%. The estimated 3-year progression-free survival rate was significantly higher among patients who received high-dose therapy than patients who received CDME only(41.5% vs 20.0%, p<0.05). And, 3-year overall survival rate was significantly higher among patients who received high-dose therapy(51.3% vs 25.0%, p <0.05). Conclusions : In relapsed or refractory NHL, CDME chemotherapy is an effective salvage chemotherapy and allow peripheral blood stem cell collection. Also, high-dose chemotherapy with APBSCT following CDME is superior to CDME salvage chemotherapy only.

Wireless powered wearable micro light-emitting diodes

Lee, Han Eol,Lee, Daewon,Lee, Tae-Ik,Shin, Jung Ho,Choi, Gwang-Mun,Kim, Cheolgyu,Lee, Seung Hyung,Lee, Jae Hee,Kim, Yong Ho,Kang, Seung-Mo,Park, Sang Hyun,Kang, Il-Suk,Kim, Taek-Soo,Bae, Byeong-Soo,Le Elsevier 2019 Nano energy Vol.55 No.-

<P><B>Abstract</B></P> <P>Wearable displays are considered as a bilateral communication tool in the hyperconnected era. Although several electronic clothing display was demonstrated, high power consumption issue still remained. Here, we present wireless powered wearable μLEDs (WμLEDs) with excellent stability. A custom-designed wireless power supply system operated a 30 × 30 WμLED array on a fabric. The WμLED stability was intensively investigated under bending, stretching, 85 °C/85% relative humidity and artificial sunlight conditions, showing the suitability of WμLED outdoor usage. Finally, a passive-matrix WμLED display successfully emitted a brilliant red glow on a fabric.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Wireless powered wearable μLEDs (WμLEDs) with excellent stability was realized by a custom-designed wireless energy supply system on a fabric. </LI> <LI> WμLED stability was investigated under bending, stretching, 85 °C/85% relative humidity and artificial sunlight conditions, showing the suitability of WμLED outdoor usage. </LI> <LI> A passive-matrix WμLED display successfully emitted a brilliant red glow on a fabric. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

대장암 세포주에서 주박 추출물의 유기용매 분획물의 항성장 활성

강형택(Hyung-Taek Kang),이승훈(Seung Hoon Lee),김순영(Soon Young Kim),김미선(Mi-Sun Kim),신우창(Woo-Chang Shin),손호용(Ho-Yong Sohn),김종식(Jong-Sik Kim) 한국생명과학회 2014 생명과학회지 Vol.24 No.9

본 연구는 한국 고유의 전통주인 막걸리 제조시 생성되는 주박 추출물과 유기용매 분획물을 총 85종 분리하여, 이들의 대장암 세포주에 대한 항성장 활성과 활성기전을 연구하였다. 이들 중 세포생존율 연구결과에 따라 3가지 종류의 분획물(KSD-E1-3, KSD-E2-3, KSD-E4-3)을 선별하였다. 이 중 가장 활성이 높은 KSD-E1-3 분획물에 의한 유전체 수준에서의 유전자 발현변화를 확인하기 위하여 oligo DNA microarray 실험을 수행하였다. 그 결과, 2배 이상 발현이 증가된 유전자들 가운데 항암 유전자인 NAG-1, ATF3, DDIT3 그리고 p21을 선별하여 추가 실험을 진행하였다. 세포생존율 결과에 따라 선별된 3가지 종류의 분획물(KSD-E1-3, KSD-E2-3 그리고 KSD-E4-3)에 의한 4가지 종류의 유전자의 발현을 확인한 결과, KSD-E1-3에 의하여 모든 유전자의 발현이 높게 증가되었다. KSD-E1-3에 의한 유전자의 발현이 전사조절인자 p53에 의존적인지 확인하고자 p53 null HCT116 세포주를 이용하여 RT-PCR한 결과, NAG-1, ATF3, 그리고 DDIT3 유전자 p53에 비의존적이었으며, 반면 p21 유전자는 p53에 의해서만 발현이 증가되는 것을 확인하였다. 이러한 연구 결과는 주박 추출물이 다양한 기작에 의해 항암 유전자의 발현을 유도함으로써 암 세포에 대한 항성장 활성을 보여주고 있음을 나타낸다. In the present study, we prepared eighty-five different kinds of lees extracts and their solvent fractions and investigated their anti-proliferative activities against human colorectal cancer HCT116 cells. HCT116 cells were treated with eighty-five solvent fractions of lees extracts and then cell viability was measured using MTS assay. Among the treated solvent fractions, three solvent fractions (KSD-E1-3, KSD-E2-3, and KSD-E4-3) were selected based on cell viability assay. In addition, we performed an oligo DNA microarray analysis to analyze the gene expression changes by treatment of KSD-E1-3 in HCT116 cells. Among the up-regulated genes, we selected 4 genes (NAG-1, ATF3, p21, and DDIT3) and performed RT-PCR using gene-specific primers. Among the treated solvent fractions, KSD-E1-3 dramatically induced the expressions of the four selected genes. In addition, we investigated whether the up-regulations of those genes were dependent on the transcription factor p53’s presence using p53 null HCT116 cells. The results indicate that the up-regulations of NAG-1, ATF3, and DDIT3 are not dependent on the p53 presence, whereas p21 is dependent on the p53 presence. These findings may help to understand the molecular mechanisms of the anti-proliferative activity mediated by rice wine lees in human colorectal cancer cells.

[P4-220602] 가드닝 프로그램이 성인 우울장애 환자의 우울, 불안, 일상활력과 코티졸, NK세포 활성도에 미치는 영향

이가윤(Ga Yoon Lee),이자희(Ja Hee Lee),김은정(Eun Jeong Kim),이완희(Wan Hee Lee),강정화(Jeong Hwa Kang),이택주(Taek Joo Lee),장태수(Tae Soo Jang),이현정(Hyun Jeong Lee),이애경(Ae Kyung Lee) 인간식물환경학회 2022 인간식물환경학회 학술대회 Vol.2022 No.춘계