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정사각뿔의 면적비를 이용한 로봇의 자기위치인식에 관한 연구
배기덕(Gi Deok Bae),김동환(Dong Hwan Kim) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In this study, we suggested a position recognition method for a robot by introducing the area ratio formed by a regular fourside pyramid image captured by a camera. The pyramid is suspended from the center of ceiling. Whenever the position of the robot is changed, the area ratio must change, which determines the robot location. Using image process technique, the area ratio was captured, later being adopted to the proposed equations to determine the current robot location. The proposed method was applied to the real robot using experiments, yielding the desirable performance.
광역스케일의 환경 인자를 이용한 어류, 식물, 조류 종수의 공간적 분포에 대한 모델링 -일본의 주요수계를 중심으로-
한미덕 ( Mi Deok Han ),이기배 ( Gi Bae Lee ) 한국환경생태학회 2008 한국환경생태학회지 Vol.22 No.4
본 연구에서는 1990~2005년 사이에 일본전국의 109개의 주요하천유역에서 조사된 어류, 식물, 조류 데이터를 이용하여, 각 생물종의 종수와 기후 및 지형의 환경인자와의 관계를 분석하고 모델링을 수행하였다. 그 결과, 어류, 식물, 조류의 분포는 각각 연평균 기온, 유역면적, 연간 강수량에 의해서 가장 많은 부분이 설명되었다. 또한, 광범위스케일에서의 환경인자데이터를 이용한 각 생물종에 대한 일반화가법모델을 이용하여 일본전국의 하천유역의 각 생물종수의 값을 예측하고 그 값을 지도화하였다. 예측값을 지도화하는 것은 관리자가 생물종의 다양성을 확보하기 위해서 보호해야할 지역을 새롭게 설정하거나, 생물다양성 보호지역의 유효성을 평가하는데 활용될 수 있다. This study analyzed and modeled the relationships between the species richness of fish, plant, and bird and environmental factors such as climatic and geographical variables based on data collected from 109 major drainage systems in Japan from 1990 until 2005. As a result, the most parts of the distributions of the fish, plant, and bird species richness were clarified by the average annual atmospheric temperature, dimension of drainage areas, and annual rainfall, respectively. In addition, this study predicted the value of each organism species distributed in national drainage areas in Japan using GAMs(Generalized Additive Models) for each organism model created by environmental factors on a wide-ranging scale, and also mapped out the value. Mapping out the predicted value could make it easier for its managers to newly set up the areas needing to be protected to obtain diversity of the organism species and to assess their availability of conservation for bio-diversity.
Se-Jong Bae,Hwui-Dong Cho,Ki-Hun Kim,Shin Hwang,Chul-Soo Ahn,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Gil-Chun Park,Young-In Yoon,Sung-Gyu Lee 한국간담췌외과학회 2022 Annals of hepato-biliary-pancreatic surgery Vol.26 No.2
Backgrounds/Aims: Anatomical resection has superior oncologic outcomes over non-anatomical resection in hepatocellular carcinoma, and left lateral sectionectomy is the simplest and easiest perform anatomical resection procedure among liver resections. The purpose of this study was to find out the safety and feasibility of pure laparoscopic left lateral sectionectomy (PLLLS) for hepatocellular carcinoma. Methods: Patients who underwent left lateral sectionectomy at a tertiary referral hospital, from August 2007 to April 2019 were enrolled in this retrospective study. After matching the 1 : 3 propensity score, 17 open and 51 pure laparoscopic cases were selected out of 102 cases of total left lateral resection for hepatocellular carcinoma. The group was analyzed in terms of patient demographics, preoperative data, and postoperative outcomes. Results: During the study period, there was no open conversion case. The mean operative time and complication were not statistically significant different between the two groups. There was no statistically significant difference in disease-free survival and overall survival had no statistical between the two groups. There were no mortality cases, and postoperative hospital stay was significantly shorter in the PLLLS group than in the open left lateral sectionectomy (OLLS) group. Conclusions: The oncologic outcomes and complication rate were the same in the PLLLS and OLLS groups. However, the hospital stay was shorter in the PLLLS group than in the OLLS group. The present study findings demonstrate that the PLLLS is a safe and feasible procedure for hepatocellular carcinoma.
정적 연소실에서 성층화된 혼합기 조건하의 점화 전극사이 당량비 측정과 연소 특성에 미치는 영향
배상수,이기철,민경덕,Bae, Sang-Su,Lee, Gi-Cheol,Min, Gyeong-Deok 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.10
To investigate only the effects of the stratified mixture distribution on initial flame propagation and combustion characteristics, the instantaneous equivalence ratio in the spark plug gap and combustion pressure were measured simultaneously In a constant volume chamber, To induce the stratified propane-air mixture distribution near the spark plug, counter-flow typed mixture injection system was used under the constant mean equivalence ratio $\Phi$$\_$mean/= 1.0 The instantaneous equivalence ratio was measured by a single-shot Raman scattering with narrow-band KrF excimer laser. The measuring error was within the limit of $\pm$ 3.5% provided that the proposed method was applied to the measured Raman signals. Judging from mass fraction burned derived from the measured pressure, the optimum combustion characteristics were shown under the condition that the local equivalence ratio in the spark plug was near 1.28$\pm$0.04, and these characteristics were more remarkable at the initial stage of combustion.
Asbestos Imaging and Detection with Differential Interference Contrast Microscopy
Zarubiieva, Iuliia,Hwang, Gi Byoung,Lee, Ji Sok,Bae, Gwi-Nam,Oh, Yoo-Mi,Park, Sun-Woo,Jun, Seong Chan,Kim, Jae Hun,Lee, Taik Jin,Lee, Hyuk Jae,Woo, Deok Ha,Lee, Seok,Cho, Myoung-Ock,Kim, Jung Kyung Taiwan Association for Aerosol Research 2013 Aerosol and air quality research Vol.13 No.3