철도차량 제동 HILS 시스템의 개선된 윤축속력 구현

이동찬,강철구,Lee, Dong-chan,Kang, Chul-Goo 제어로봇시스템학회 2015 제어·로봇·시스템학회 논문지 Vol.21 No.9

The hardware-in-the-loop simulation (HILS) of a railway vehicle is crucial for overcoming the limitation of field tests of a railway vehicle. A brake HILS system for a railway vehicle was previously not able to test the performance of a speed-sensing system of a railway vehicle, since wheelset speeds were generated only by computer simulations. In this paper, we present a novel wheelset speed implementation of a brake HILS system for a railway vehicle. Four wheelset speeds of a brake HILS system for a car of a railway vehicle are implemented using four small-sized servomotors, whereas the speed sensors and pole wheels used in the brake HILS system are the actual ones of the railway vehicle. According to the simulated speeds of four wheelsets in the dynamic equations of motion, four servomotors generate wheel speeds in real time, and then the measured wheelset speeds are fed back to the computer simulation model. Moreover, in this paper, we improve the performance of wheelset speed measurement via the T method instead of the M method presently used in the field. The performances of wheelset speed implementation and speed-sensor operation are demonstrated by experimental works using a HILS system.

회음부 재건에 있어서 박근피판의 유용성

이동찬,정연우,장학,은석찬,Lee, Dong-Chan,Jeong, Yeon-Woo,Chang, Hak,Eun, Seok-Chan 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.5

Purpose: Due to the closed and humid condition of the perineal area, wound problems occurring at this site are sometimes complicated, especially following postoperative radiation therapy. Moreover, the anal sphincter is a very important functional structure but reconstruction of the anal sphincter after severe trauma poses a challenging problem to plastic surgeons. In this article, we demonstrate the usefulness of the pedicled gracilis flap in the reconstruction of the perineal area. Methods: From September 2008 to November 2009, 6 patients, 4 males and 2 females, underwent surgery of the perineal area. The age of the patients ranged from 21 to 62 years (mean age was 48). The mean follow up period was 14 months. In 4 cases, the patient presented with wound problems after postoperative radiation therapy for anal cancer. In 2 cases, the patient presented with traumatic sphincter damage. Only the gracilis muscle was used in the 4 cases and a musculocutaneous flap was used in the 2 cases involving skin defects, respectively. Results: Among the 6 patients, 1 patient underwent hematoma evacuation of the donor site, and 1 patient presented with prolapse of the vaginal mucosa which recovered spontaneously. There were no report of other complications and there were no wound recurrences. Minimal incontinence was observed in all patients who underwent sphincter reconstruction, but all were satisfied with the overall results. Conclusion: The gracilis flap is useful in the reconstruction of the perineal area, such as in cases of radiotherapy induced wound problems and sphincter damage following severe trauma, due to its easy accessibility, rich vascularity, and minimal donor site morbidity.

저영향개발 (LID)을 적용한 빗물 관리 시스템에 의한 물 순환 복원

이동찬,Lee, Dong Chan 응용생태공학회 2016 Ecology and resilient infrastructure Vol.3 No.2

도시개발로 인한 불투수면의 증가는 우수의 지중 침투량 감소에 의한 지하수위 하강, 강우 유출량 증가에 의한 침수해, 고농도 초기 우수에 의한 환경오염 등의 문제를 야기시킨다. 따라서 이러한 문제에 대한 대책방안으로서 저영향개발 기법 도입의 필요성이 증가하고 있다. 본 연구에서는 저영향개발 (LID) 기법이 적용된 단지 내 빗물관리시스템 모니터링에 의한 물 순환복원효율을 분석하였다. 본 연구에서 빗물관리시스템을 적용한 단지 개발에서 기존 방식에 비교하여 물 순환 효율이 41%가 증가하였다. The increase in impervious surfaces due to urban development has caused a groundwater drawdown through the reduction of underground infiltration, flood disaster due to increased rainfall runoff and environmental pollution in higher pollutant concentrations of first flush rainwater. As an alternative to these problems, the needs of low impact development (LID) techniques is increasing in urban areas. In this study, the restoration efficiency of water cycle was assessed at a residential site development applied with the LID rainwater management system. The results of monitoring the water cycling showed that the efficiency of water cycle of LID rainwater management system was improved 41% more than that of conventional methods.

집단산업보건관리체제의 도입을 위한 제언

이동찬,Lee, Dong-Chan 대한산업보건협회 1986 산업보건소식 Vol.25 No.-

산업용 감시카메라의 네트워크 구성 설계

이동찬(Dong-Chan Lee),이용희(Yong-Hee Lee),조영훈(Young Hoon Cho),이동희(Dong-Hee Lee),박종태(Jong-Tae Park),권대근(Dae-geun Kwon) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅲ

현재 산업 현장에서 사용되고 있는 산업용 감시카메라는 고정채널방식에 기반한 아날로그 카메라들이 대부분이며 하나의 모니터에 종속되어 사용되는 것이 일반적이다. 이로 인해 대규모의 산업용 감시 카메라를 보유한 대규모공장의 조업에 적잖은 비능률을 초래해 왔다. 본 논문에서는 현재 산업용 감시카메라들의 운영에 관한 문제점들을 들고 이를 극복할 수 있는 대안으로 IP기반의 디지털 카메라를 이용한 산업용 감시카메라의 네트워크 구성을 제안한다.

정수소독공정에 이용되는 염소, 이산화염소, 오존 소독제의 비교, 고찰에 관한 연구

이윤진,이선종,이동찬,김현,이환,이철효,남상호,Lee, Yoon-Jin,Lee, Sun-Jong,Lee, Dong-Chan,Kim, Hyun,Lee, Hwan,Lee, Cheol-Hyo,Nam, Sang-Ho 한국환경보건학회 2002 한국환경보건학회지 Vol.28 No.3

The experiments for the characterization of inactivation were performed in a series of batch processes with the total coliform as a general indicator organism based on chlorine, chlorine dioxide and ozone as disinfectants. The water sam-ples were taken from the outlet of settling basin in a conventional surface water treatment system that is provided with the raw water drawn from the mid-stream of the Han River. The inactivation of total coliform was experimentally ana-lyzed for the dose of disinfectant contact time, pH, Temperature and DOC. The nearly 2.4,3.0,3.9 log inactivation of total coliform killed by injecting 1 mか1 at 5 minutes for chlorine, chlorine dioxide and ozone. For the inactivation of 99.9%(3 log), Disinfectants required were 1.70, 1.00 and 0.60 mか1 for chlorine, chlorine dioxide and ozone, respec-tively. The higher the pH is, the poorer the disinfections effects are in the range of pH 6-9 by using chlorine and ozone. But the irfluence of pH value on killing effects of chlorine dioxide is weak. The parameters estimated by the models of Chick-Watson, Hom, and Selleck from our experimental data obtained for chlorine are: log(N/ $N_{0}$ )=-0.16 CT with n= 1, log(N/ $N_{0}$ )=-0.71 $C^{0.87}$T with n$\neq$1, for Chicks-Watson model, log (N/ $N_{0}$ )= -1.87 $C^{0.47}$ $T^{0.36}$ for Hom model. For chlorine dioxide are: log(N/ $N_{0}$ )= -1.53 CT with n = 1, log(N/ $N_{0}$ )= -2.29 $C^{0.94}$T with n$\neq$1,, for Chicks-Watson model, log(N/ $N_{0}$ )= -3.64 $C^{0.43}$ $T^{0.24}$ for Hom model and for ozone are: log(N/ $N_{0}$ )= -2.59 CT with n = 1, log(N/ $N_{0}$ )= -2.28 $C^{0.36}$T with n$\neq$1, for Chicks-Watson model, log(N/ $N_{0}$ )= -4.53 $C^{0.26}$ $T^{0.19}$ for Hom model.19/ for Hom model.

부동산 권리분석에 관한 이론적 연구

이동찬 ( Lee Dong Chan ) 한국부동산학회 2013 不動産學報 Vol.52 No.-

1. CONTENTS (1) RESEARCH OBJECTIVES This study examined development, brokerage and appraisal and assessment of real estate, and it suggested needs of title analysis of real estate. (2) RESEARCH METHOD The study investigated literature from theoretical point of view of title analysis to discover rules of real estate phenomenon by using scientific material, theses and associated books. (3) RESEARCH FINDINGS In Korea, there existed no official and independent business that could examine real estate title. Parties to a transaction who had primary level of professionalism protected their property right and examined real estate title for safety of the transaction to produce transaction accidents frequently. 2. RESULTS The real estate related activities helped develop not only national economy but also community economy: The title analysis of real estate could prevent various kinds of transaction accidents of individuals and to help improve relations between real estate and men. So, real estate title analysis system at real estate transaction should be made as soon as possible.

구속된 다물체 시스템에 대한 운동 방정식의 미분 방정식화 및 동역학 해석

이동찬(D. C. Lee),이상호(S. H. Lee),한창수(C. S. Han) 한국자동차공학회 1997 한국 자동차공학회논문집 Vol.5 No.1

LR-WPAN 시스템을 위한 비동기 복조 알고리즘 및 하드웨어 구조설계

이동찬 ( Dong Chan Lee ),장수현 ( Soo Hyun Jang ),정윤호 ( Yun Ho Jung ) 한국항행학회 2013 韓國航行學會論文誌 Vol.17 No.6

본 논문에서는 다중 전송률 지원이 가능하도록 개선된 LR-WPAN (Low-Rate Wireless Personal Area Network) 시스템을 위한 효율적인 복조 알고리즘 및 하드웨어 구조를 기술하였다. 여러 센서응용 시스템에 대한 연구가 활발히 진행됨에 따라 다양한 전송률을 지원하는 LR-WPAN 시스템의 필요성이 커지고 있다. 이에, 본 논문에서는 심볼 단위 이중상관방식 (SymBol based Double Correlation, SBDC)을 변형한 샘플 단위 이중상관 방식 (SamPle based Double Correlation, SPDC)을 제안한다. 제안된 알고리즘은 다양한 전송률 지원에 따른 복잡도의 증가가 없으며, IEEE 802.15.4 LR-WPAN 시스템에서 권고하는 ±80 ppm (송/수신 각각 ±40ppm) 의 주파수 오프셋에서도 동작이 가능한 non-coherent 복조방식이다. 하드웨어 구현은 verilog HDL을 사용하였으며, FPGA 테스트 보드를 이용하여 설계 및 검증을 수행하였다. In this paper, we present a low-complexity non-coherent demodulation algorithm and hardware architecture for LR-WPAN systems which can support the variable data rate for various applications. The need for LR-WPAN systems that can support the variable data rate is increasing due to the emergence of various sensor applications. Since the existing symbol based double correlation (SBDC) algorithm requires the increase of complexity to support the variable data rate, we propose the sample based double correlation (SPDC) algorithm which can be implemented without the increase of complexity. The proposed non-coherent demodulator was designed by verilog HDL and implemented with FPGA prototype board.

판형열교환기 내 대체냉매의 열전달특성 및 설계방향에 대한 연구

이동찬(Dongchan Lee) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11