http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Flip 모션을 이용한 신개념 필드 로봇 플랫폼의 큰 장애물 등반 정적 해석 및 실험
서병훈(ByungHoon Seo),신명석(Myeongseok Shin),정경민(Kyungmin Jeong),서태원(TaeWon Seo) 제어로봇시스템학회 2014 제어·로봇·시스템학회 논문지 Vol.20 No.10
The ability to overcome obstacles is necessary for field robots for various applications including the ability to climb stairs. While much research has been performed focusing on overcoming obstacles, the resulting robots do not have sufficient ability to overcome obstacles such as stairs. In this research, the purpose is to overcome relatively large obstacles by flipping locomotion through the modification of the stair climbing robotic platform of the previous research. We propose two scenarios to overcome large obstacles: a rear wheel driving system and an elevation system using a ball screw. The research is performed based on static analyses on obstacleclimbing. As the simulation results indicate, we determined the optimal posture of the robot for climbing obstacles for rear wheel driving. Also, an elevation system is analyzed for obstacle climbing. Between the two scenarios an elevation system is determined to reduce the operating torque of the actuator, and the prototype was recently assembled. The climbing ability of the robotic platform is verified. We expect the application area for this robotic platform will be in accident areas of nuclear power plants.
Byunghoon Chung,Hun Lee,Bong Joon Choi,Kyung Ryul Seo,Eung Kwon Kim,Dae Yune Kim,Tae-im Kim 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.1
Purpose: The purpose of this study was to investigate the clinical efficacy of an optimized prolate ablation procedure for correcting residual refractive errors following laser surgery. Methods: We analyzed 24 eyes of 15 patients who underwent an optimized prolate ablation procedure for the correction of residual refractive errors following laser in situ keratomileusis, laser-assisted subepithelial keratectomy, or photorefractive keratectomy surgeries. Preoperative ophthalmic examinations were performed, and uncorrected distance visual acuity, corrected distance visual acuity, manifest refraction values (sphere, cylinder, and spherical equivalent), point spread function, modulation transfer function, corneal asphericity (Q value), ocular aberrations, and corneal haze measurements were obtained postoperatively at 1, 3, and 6 months. Results: Uncorrected distance visual acuity improved and refractive errors decreased significantly at 1, 3, and 6 months postoperatively. Total coma aberration increased at 3 and 6 months postoperatively, while changes in all other aberrations were not statistically significant. Similarly, no significant changes in point spread function were detected, but modulation transfer function increased significantly at the postoperative time points measured. Conclusions: The optimized prolate ablation procedure was effective in terms of improving visual acuity and objective visual performance for the correction of persistent refractive errors following laser surgery.
컴퓨터교육 : 보안교육 ; NXT 기반의 염도센서 보정 알고리즘 연구
박병훈 ( Byunghoon Park ),장연진 ( Yeonjin Jang ),오영빈 ( Youngbin Oh ),서지민 ( Jimin Seo ),장명호 ( Myungho Jang ),김희주 ( Heeju Kim ),김석희 ( Seokhee Kim ),김동정 ( Dongjung Kim ),정대용 ( Daeyong Jung ),임종범 ( Jongbeom Li 한국컴퓨터교육학회 2013 한국컴퓨터교육학회 학술발표대회논문집 Vol.17 No.1
``나트륨의 과다섭취가 성인병의 요인이 된다``는 최근 연구 결과를 바탕으로 염분 섭취에 대한 관심이 증대 되면서 저염도 식품 등 염도 측정이 필요한 분야에서 염도 측정의 높은 정확도를 요구하고 있다. 본 연구에서는 기존 염도 측정과 관련된 분야의 연구 결과를 활용해서 NXT 기반의 염도센서를 제작하고, 제작한 염도센서에서 산출된 결과 값을 이용하여 저염도 측정 과정에서 발생할 수 있는 염도 측정의 부정확함을 개선하고자 한다. 이를 위해 NXT 기반의 염도센서에서 나오는 저항값을 토대로 정확한 염도값을 구하기 위한 보정 알고리즘을 연구하였고 이를 프로그래밍하여 구현하였다. 실험을 통해 저염도 구간에서의 염도측정의 정밀함을 개선하는 결과를 얻었다.
Bae, Seo Ryung,Choi, Jihye,Kim, Hyun-Ouk,Kang, Byunghoon,Kim, Myeong-Hoon,Han, Seungmin,Noh, Ilkoo,Lim, Jong-Woo,Suh, Jin-Suk,Huh, Yong-Min,Haam, Seungjoo The Royal Society of Chemistry 2015 Journal of materials chemistry. B, Materials for b Vol.3 No.3
<P>The integration of contrast-enhanced diagnostic imaging and therapy could utilize image guided therapy to plan treatment strategy. Toward this goal, a unique construction and operation of a pseudo metal based photothermal therapeutic agent (PPAM) is introduced by polyaniline (PANI) generation templated on iron oxide metal nanoclusters (MNCs). Notably, MNC core interferes as a catalytic agent and enables aniline polymerization under ambient acidic conditions. The intrusion of transition metal enhanced the proton sensitivity of PANI, which led to pH responsive conversion even at dilute proton concentrations (pH 5, 6) compared to the PANI particles prepared by conventional methods. Under physiological pH, PPAM reveals no special features; however, under low pH conditions, which is a notable characteristic of the cancer microenvironment, PPAM automatically converts into its emeraldine salt (ES) state and thus activates as a photothermal therapeutic agent. Utilizing this specific redox responsive switched off-on behavior of PPAM, precise and systemized photothermal therapy is demonstrated, proving itself as a smart and efficient photothermal therapeutic agent.</P>
Sang-Gyun Kang,Sangsoo Seo,Byongjun Lee,Byunghoon Chang,Rohae Myung 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.3
This paper presents a centralized control algorithm for power system performance in the Korean power system using Flexible AC Transmission Systems (FACTS) devices. The algorithm is applied to the Korean power system throughout the metropolitan area in order to alleviate inherent stability problems, especially concerns with voltage stability. Generally, control strategies are divided into local and centralized control. This paper is concerned with a centralized control strategy in terms of the global system. In this research, input data of the proposed algorithm and network data are obtained from theSCADA/EMS system. Using the full system model, the centralized controller monitors the system conditionand decides the operating point according to the control objectives that are, in turn, dependenton system conditions. To overcome voltage collapse problems, load-shedding is currently applied in the Korean power system.In this study, the application of the coordination between FACTS and switch capacitor (SC) canrestore the solvability without load shedding or guarantee the FV margin when the margin is insufficient.Optimal Power Flow (OPF) algorithm, for which the objective function is loss minimization, isused in a stable case. The results illustrate examples of the proposed algorithm using SCADA/EMS data of the Korean power system in 2007.
펨토초레이저 백내장수술 후 건성안에 대한 0.15% 무보존제 히알루론산나트륨의 임상적 효과
김태환(Tae Hwan Kim),정병훈(Byunghoon Chung),김강윤(Kang Yoon Kim),전익현(Ikhyun Jun),서경률(Kyoung Yul Seo),김응권(Eung Kweon Kim),김태임(Tae-im Kim) 대한안과학회 2021 대한안과학회지 Vol.62 No.7
목적: 펨토초레이저 백내장수술 후 발생하는 건성안에 대한 0.15% 무보존제 히알루론산나트륨 점안액의 임상적 효과를 분석하고자 하였다. 대상과 방법: 본원에서 진료 중인 건성안 환자들 중 펨토초레이저 백내장수술을 시행한 총 37안을 대상으로 수술 후 0.15% 무보존제히알루론산나트륨 점안액을 사용한 치료군 19안, 사용하지 않은 대조군 18안에 대해 수술 전, 후 1, 3개월째 각결막형광염색점수, 눈물막파괴시간, 1형 쉬르머검사, 안구표면질환지수, 눈꺼풀 마이봄샘 평가, 눈물 지질층 두께를 측정하였다. 결과: 치료군에서는 수술 후 3개월째 안구표면질환지수의 유의한 감소, 눈물막파괴시간의 증가, 각결막형광염색점수의 감소, 1형 쉬르머검사의 유의한 증가가 확인된 반면, 대조군에서는 수술 후 1, 3개월째 유의한 쉬르머검사의 감소, 1개월째 마이봄샘 성상 악화, 3개월째 눈물막파괴시간 감소가 관찰되었다. 안구표면질환지수는 수술 후 1, 3개월째 치료군에서 유의하게 낮았으며, 눈물막파괴시간은 수술 후 3개월째 치료군에서 유의하게 높게 나타났다. 또한 수술 후 3개월째 치료군에서 마이봄샘 성상이 유의하게 좋은 결과를 보였다. 이외에 각결막형광염색점수와 눈물 지질층 두께를 포함한 다른 건성안 지표에 대해서는 치료군과 대조군 간 유의한 차이를 보이지 않았다. 결론: 펨토초레이저 백내장수술 후 무보존제 0.15% 히알루론산나트륨 점안액 사용은 수술 후 발생하는 건성안 증상을 경감시키고 눈물막 안정성 향상에 도움을 줄 수 있다. Purpose: The efficacy of using preservative-free 0.15% sodium hyaluronate eyedrops for dry eye disease after femtosecond laser- assisted cataract surgery (FLACS) was evaluated. Methods: This prospective randomized study was conducted on patients with dry eye who were scheduled for FLACS among those with Tear Film & Ocular Surface Society Dry Eye Workshop II Dry Eye Levels 1 and 2. In total, 37 eyes scheduled for FLACS were randomized to the treatment group (n = 19) or control group (n = 18). Corneal and conjunctival fluorescein staining (CFS), tear breakup time (TBUT), Schirmer I test (SIT) value, ocular surface disease index (OSDI), meibomian gland evaluation result, and lipid layer thickness were evaluated for all patients, preoperatively and at 1 and 3 months postoperatively. Results: In the treatment group, the OSDI and CFS scores were significantly lower at 3 months postoperatively than at baseline, but the TBUT and SIT values were significantly increased. In the control group, TBUT was significantly shorter at 3 months postoperatively than at baseline, SIT values were significantly decreased at 1 and 3 months postoperatively compared with the baseline, and meibum quality was significantly aggravated at 1 month postoperatively compared with the baseline. In the treatment group, OSDI improved significantly from baseline at 1 and 3 months. TBUT increased significantly in the treatment group at postoperative 3 months. Meibomian gland quality showed clinically better results in the treatment group than in the control group at postoperative 3 months. There were no significant differences in corneal and CFS, lipid layer thickness, and other dry eye disease parameters between the treatment and control groups. Conclusions: Preservative-free 0.15% sodium hyaluronate eyedrops were effective for improving dry eye symptoms and tear film stability after FLACS.