국내 운용 UHF-윈드프로파일러 레이더의 원시 스펙트럼 분석

이경훈,권병혁,김유진,이건명,Lee, Kyung-Hun,Kwon, Byung-Hyuk,Kim, Yu-Jin,Lee, Geon-Myeong 한국전자통신학회 2022 한국전자통신학회 논문지 Vol.17 No.5

In this paper raw spectrum data were analyzed to suggest the moving forward of performance evaluation and quality control of wind profilers of four manufacturers operating in South Korea. For the analysis, the profile of the spectrum averaged by season and the profile of four statistical values (minimum, average, median, and maximum) calculated by Power Spectrum Density (PSD) were used. The quality of spectrum data was the best for LAP-3000, followed by YKJ3, PCL-1300, and CLC-11-H. In Cheorwon and Chupungnyeong, where PCL-1300 was installed, the variability of the spectrum due to ground clutter and non-meteorological signals was large, so ground clutter removal and signal processing such as moving average and multi-peak were required. In Gunsan and Paju, where CLC-11-H was installed, DC (Direct Current) bias and propagation folding were found, so it is necessary to remove the DC bias and limit the effective altitude for observation.

액체추진로켓엔지용 고압 터보펌프개발

이경훈,김경호,우유철,Lee, Kyoung-Hoon,Kim, Kyoung-Ho,Woo, Yoo-Chul 한국유체기계학회 2004 한국유체기계학회 논문집 Vol.20 No.3

고성능 디스플레이 응용을 위한 8b 240 MS/s 1.36 ㎟ 104 mW 0.18 um CMOS ADC

이경훈,김세원,조영재,문경준,지용,이승훈,In Kyung-Hoon,Kim Se-Won,Cho Young-Jae,Moon Kyoung-Jun,Jee Yong,Lee Seung-Hoon 대한전자공학회 2005 電子工學會論文誌-SD (Semiconductor and devices) Vol.42 No.1

This work describes an 8b 240 MS/s CMOS ADC as one of embedded core cells for high-performance displays requiring low power and small size at high speed. The proposed ADC uses externally connected pins only for analog inputs, digital outputs, and supplies. The ADC employs (1) a two-step pipelined architecture to optimize power and chip size at the target sampling frequency of 240 MHz, (2) advanced bootstrapping techniques to achieve high signal bandwidth in the input SHA, and (3) RC filter-based on-chip I/V references to improve noise performance with a power-off function added for portable applications. The prototype ADC is implemented in a 0.18 um CMOS and simultaneously integrated in a DVD system with dual-mode inputs. The measured DNL and INL are within 0.49 LSB and 0.69 LSB, respectively. The prototype ADC shows the SFDR of 53 dB for a 10 MHz input sinewave at 240 MS/s while maintaining the SNDR exceeding 38 dB and the SFDR exceeding 50 dB for input frequencies up to the Nyquist frequency at 240 MS/s. The ADC consumes, 104 mW at 240 MS/s and the active die area is 1.36 ㎟. 본 논문에서는 각종 고성능 디스플레이 등 주로 고속에서 저전력과 소면적을 동시에 요구하는 시스템 응용을 위한 임베디드 코어 셀로서의 8b 240 MS/s CMOS A/D 변환기 (ADC)를 제안한다. 제안하는 ADC는 아날로그 입력, 디지털 출력 및 전원을 제외한 나머지 모든 신호는 칩 내부에서 발생시켰으며, 본 설계에서 요구하는 240 MS/s 사양에서 면적 및 전력을 동시에 최적화하기 위해 2단 파이프라인 구조를 사용하였다. 특히 입력 단에서 높은 입력 신호 대역폭을 얻기 위해 개선된 부트스트래핑기법을 제안함과 동시에 잡음 성능을 향상시키기 위해 제안하는 온-칩 전류/전압 발생기를 온-칩 RC 저대역 필터와 함께 칩 내부에 집적하였으며, 휴대 응용을 위한 저전력 비동작 모드 등 각종 회로 설계 기법을 적절히 응용하였다. 제안하는 시제품 ADC는 듀얼모드 입력을 처리하는 DVD 시스템의 핵심 코어 셀로 집적되었으며, 성능 검증을 위해 0.18um CMOS 공정으로 별도로 제작되었고, 측정된 DNL과 INL은 각각 0.49 LSB, 0.69 LSB 수준을 보여준다. 또한, 시제품측정 결과 240 MS/s 샘플링 속도에서 최대 53 dB의 SFDR을 얻을 수 있었고, 입력 주파수가 Nyquist 입력인 120 MHz까지 증가하는 동안 38 dB 이상의 SNDR과 50 dB 이상의 SFDR을 유지하였다. 시제품 ADC의 칩 면적은 1.36 ㎟이며, 240 MS/s 에서 측정된 전력 소모는 104 mW이다.

정신분열병 환자에서 Clozapine과 그 대사물들의 혈장농도 및 FMO3 유전자 변이

이경훈,김철응,Lee, Kyung-Hoon,Kim, Chul Eung 대한생물정신의학회 2006 생물정신의학 Vol.13 No.3

Objective : The relationship between the total daily dose of clozapine given and the plasma concentrations of clozapine and its metabolites(N-desmethylclozapine and clozapine N-oxide) and the effect of Glu158Lys (wild-type : Glu, 'H' ; variant : Lys, 'h') and Glu308Gly(wild-type : Glu, 'D' ; variant : Lys, 'd') variation in FMO3 gene on plasma concentrations of clozapine and its metabolites was studied in schizophrenic patients. Methods : Trough plasma concentrations of clozapine and its metabolites were measured in 34 schizophrenic patients receiving clozapine. The genetic variation of 'h' and 'd' in FMO3 were analyzed in 21 among 34 patients. Results : A linear relationship between the total daily dose of clozapine given(mg/kg body weight per day) and the plasma concentrations(nM) of clozapine was revealed by regression analysis(p<0.001) in the 23 patients receiving a constant daily dose of clozapine for 8 days. The plasma molar concentration ratios of clozapine N-oxide/clozapine in 8 subjects with 'hh' or 'Hh' alleles were not different from those in 6 subjects with 'HH' alleles and the plasma molar concentration ratios in 6 subjects with 'dd' or 'Dd' alleles were not different from those in 8 subjects with 'DD' alleles. Conclusion : The effect of Glu158Lys and Glu308Gly variation in FMO3 gene on clozapine metabolism could not be shown.

온도와 부하의 비선형성을 이용한 단기부하예측에서의 TAR(Threshold Autoregressive) 모델

이경훈,이윤호,김진오,Lee, Gyeong-Hun,Lee, Yun-Ho,Kim, Jin-O 대한전기학회 2001 전기학회논문지A Vol.50 No.9

This paper proposes TAR(Threshold Autoregressive) model for short-term load forecasting including temperature variable. In the scatter diagram of daily peak load versus daily high or low temperature, we can find out that the load-temperature relationship has a negative slope in the lower regime and a positive slope in the upper regime due to the heating and cooling load, respectively. TAR model is adequate for analyzing these phenomena since TAR model is a piecewise linear autoregressive model. In this paper, we estimated and forecasted one day-ahead daily peak load by applying TAR model using this load-temperature characteristic in these regimes. The results are compared with those of linear and quadratic regression models.

한.미간의 공동시장 참여 확대 방안

이경훈,Lee, Gyeong-Hun 한국방위산업진흥회 1991 國防과 技術 Vol.- No.154

현재 한국 방위산업은 R&D 투자확대, 기존장비 대폭개선, 첨단무기체계 개발촉진 등과 같은 과제에 직면하고 있습니다. 미국정부와 방산업체들은 마케팅활동과 기술이전에 대해 보다 유연한 자세를 갖고, 보다 적극적으로 응해야 할것입니다. 한국은 생산기술과 품질관리면에서 국제경쟁력을 갖춘 국가로 성장했습니다. 한국을 제3국시장으로의 공동진출을 위한 동남아 수출 전진기지로 활용할 것을 제의합니다

대공간 교육시설에 사용되는 합성보 및 콘크리트 슬래브의 진동평가에 대한 연구

이경훈,정은호,Lee, Kyoung-Hun,Jeong, Eun-Ho 한국교육녹색환경연구원 2010 교육·녹색환경연구 Vol.9 No.3

In this study, vibration characteristics of reinforced concrete slab in large span educational facilities were evaluated. A 21.75m X 14.4m full scale reinforced concrete slab specimen was constructed with pre-flex hybrid beams. Vibrations were generated by three different methods such as free falling method of a 6kg sand bag, a 70kg person walking method and impact method by impulse hammer. Vibrations were generated more than 3 times at single location. Vibration characteristic data were collected by SA390 signal analyzer machine at 5 different locations.

교육시설 공사현장의 추락예방 보호구 지급개선에 관한 연구

이경훈,김정호,Lee, Kyoung-Hun,Kim, Jung-Ho 한국교육녹색환경연구원 2014 교육·녹색환경연구 Vol.13 No.2

Recently, a series of massive earthquakes have been occurred northeast Asia and there has also been constant sensible earthquakes in South Korea. Particularly, after diagnosing educational facilities with Sichuan earthquake momentum, remodeling construction of old educational facilities and buildings which were not designed not to resist earthquake are actively underway. Remodeling construction sites, however, are mostly small construction sites which consist of less than 30 full-time laborers, where a number of deaths from a fall occur by improper uses of protective gear. Therefore, to reduce the disaster from a fall caused by inadequate uses of protective gear in domestic small construction sites such as those for remodeling, this study conducts research into ways of decreasing accident rates by suggesting providing and administering protective gear as a national project so that donning protective gear is activated.

만성 신부전을 초래한 Hinman 증후군 1례

이경훈,이은실,박용훈,Lee Gyeong-Hoon,Lee Eun-Sil,Park Yong-Hoon 대한소아신장학회 1998 Childhood kidney diseases Vol.2 No.1

Hinman syndrome is a condition representing urinary voiding dysfunction in the neurologically intact child. The syndrome is probably caused by acquired behavioral and psychosocial disorders manifested by bladder and/or bowel dysfunction mimicking neurologic disease. Clinically, the symptom complex may include day and night time enuresis, encopresis, constipation, and recurrent urinary tract infections. Cystoscopy frequently demonstrates normal vesicourethral anatomy. Voiding films usually demonstarate a carrot-shaped proximal urethra with a persistent narrowing at the external sphincter. The bladder is large and often appears trabeculated with a thickened wall and significant postvoid residual. A 13-year-old male child was admitted due to fever, urinary tract infection, enuresis and flank pain. His neurologic examination was normal. Renal sonograms showed moderate hydronephrosis. Voiding cystourethrograms showed a huge, trabeculated bladder without vesicourethral reflux and urethral valves. No abnormal findings was found in spinal MRI.

『흙』, 민족과 국가의 경합

이경훈 연세대학교 인문과학연구소 2004 人文科學 Vol.86 No.-