전동화된 스피드 스프레이어의 블레이드 형상에 따른 송풍구 유동 특성 분석

오승훈,심재록,서현규 한국분무공학회 2023 한국액체미립화학회지 Vol.28 No.1

The objective of this numerical study is to investigate the effect of the shape and material of the blower blade for the electrified speed sprayer on the blowing performance. The shape of the blade was changed to the bonding angle, the number of blades, the width of the blade, and the blade length based on the existing model. In order to obtain the reliability of the numerical model, the analysis of the grid dependence was performed in the numerical analysis. The numerical analysis results were compared and analyzed in terms of the agricultural chemical penetration length characteristics, flow uniformity characteristics, and velocity distribution characteristics. Furthermore, the effect of material change on weight reduction and structural characteristics was also compared and analyzed. As a result of the analysis, it was found that the optimal condition was that the blade angle was 45º, the number of blades was 12, and the width was 115 mm, which was confirmed through a comparison of the inlet mass flow rate. As a result of the equivalent stress lower than the yield strength due to the material change from aluminum to steel compared to the existing steel, structural defects do not appear, and it is judged that the operation time compared to the battery capacity will be improved through the weight reduction of the blade.

대학캠퍼스 내 주차특성에 관한 연구

오승훈,Oh, Seung Hwoon 대한토목학회 2014 대한토목학회논문집 Vol.34 No.2

자동차 보유의 증가로 대학캠퍼스에서도 교수, 교직원, 학생 등의 등하교 행태가 자동차이용형으로 급변하는 현실에서 대학캠퍼스는 주차장의 확충, 정비 등 자동차를 받아들일 수 있는 인프라가 대단히 열악하다. 이러한 캠퍼스 내 주차현실에도 불구하고 이에 상응하는 국내 외 연구는 미미한 실정이다. 이에 본 연구에서는 국내 수도권(서울시, 경기도, 인천시)에 소재하고 있는 16개 대학교의 승용차 이용자들을 대상으로 캠퍼스 주차장을 이용하는 데 영향을 미칠 수 있는 평가항목을 총 7개(경제성, 접근성, 편리성, 정시성, 안전성, 정보성, 기타)로 선정하여 설문조사를 실시하였다. 그리고 이 설문조사를 바탕으로 중요도-만족도분석(ISA: Importance-Satisfaction Analysis)을 수행하여 이용자들이 느끼는 각 항목별 중요도와 만족도를 파악하였다. 또한 ISA분석을 통하여 얻어낸 항목별 중요도와 만족도를 바탕으로 각 대학캠퍼스 주차장의 특성을 비교하였으며, 마지막으로 본 연구를 통해 파악된 요인들을 바탕으로 대학교 주차관리대책을 수립하는 데 기준이 될 수 있는 방안을 간략히 제시하였다. Parking infrastructure in university campuses has been inadequately developed in spite of rapid increase in car ownership of professors, staffs and students. However, only a few researches have been conducted domestically and overseas to identify and solve the problem. Thus, in this study owner drivers in 16 campuses located in Seoul Metropolitan Area were interviewed to figure out what they thought were important factors and how much they were satisfied when they were using parking lots in campuses. The questionnaires of the survey included economy, accessibility, convenience, punctuality, safety and informativeness. The Importance-Satisfaction Analysis was conducted based on the survey. And the parking characteristics of university campuses were compared based on the levels of importance and satisfaction calculated by ISA. Lastly, criteria of establishing campus parking management guideline were suggested as well.

Voltage Regulation of Connexin Channel Conductance

오승훈,Thaddeus A. Bargiello 연세대학교의과대학 2015 Yonsei medical journal Vol.56 No.1

Voltage is an important parameter that regulates the conductance of both intercellularand plasma membrane channels (undocked hemichannels) formed by the 21 members of the mammalian connexin gene family. Connexin channels display two forms of voltage-dependence, rectification of ionic currents and voltage-dependentgating. Ionic rectification results either from asymmetries in the distributionof fixed charges due to heterotypic pairing of different hemichannels, or by channel block, arising from differences in the concentrations of divalent cations on opposite sides of the junctional plaque. This rectification likely underpins the electricalrectification observed in some electrical synapses. Both intercellular and undockedhemichannels also display two distinct forms of voltage-dependent gating, termed Vj (fast)-gating and loop (slow)-gating. This review summarizes our currentunderstanding of the molecular determinants and mechanisms underlying these conformational changes derived from experimental, molecular-genetic, structural, and computational approaches.

음주운전사고 예측모형개발에 관한 연구

오승훈,임헌연 대한토목학회 1997 대한토목학회 학술발표회 논문집 Vol.1997 No.1

심해공학수조 조파기 전달함수 근사 모델 개발

오승훈,김은수,정성준 한국항해항만학회 2022 한국항해항만학회지 Vol.46 No.6

This study aims to investigate the characteristics of wave generation in a deep ocean engineering basin and to develop a meta-model of the transfer function of the wavemaker that reflects the geometric characteristics of the deep ocean engineering basin. To this end, the two-dimensional frequency domain boundary element method was applied to achieve an efficient analysis that reflects the geometric characteristics of the deep ocean engineering basin. The developed numerical method was validated through comparison with the analytical solution. Numerical analyses were conducted for the boundary value problem of the wavemaker according to various periods and the positions of the movable bottom. The numerical results were used to investigate the effect of the geometric characteristics of the deep ocean engineering basin on the transfer function of the wavemaker, and the effect of depth on wave generation was checked by changing the position of the movable bottom. To efficiently utilize the various results of the boundary element method, a meta-model, an approximate model of the transfer function of the wave maker, was developed using a thin plate spline interpolation model. The validity of the developed meta-model was confirmed through a comparison of the results of the model tests. 본 연구는 심해공학수조의 파 생성 특성을 규명하고, 심해공학수조의 기하학적 특성을 반영한 조파기 전달함수의 근사모델을 개발하는 것을 목적으로 한다. 심해공학수조의 기하학적 특성을 반영한 효율적인 해석을 위해 2차원 주파수영역 경계요소법이 적용되었다. 개발된 수치해석법은 해석해와 비교하여 검증되었다. 다양한 주기와 이동식 바닥판의 위치 변화에 대한 조파기의 경계치 문제의 수치해석이 수행되었다. 수치결과를 통해 심해공학수조의 기하학적 특성이 조파기의 전달함수에 미치는 영향을 조사하였고, 이동식 바닥판의 위치를 ​​변화시켜 파도 생성에 대한 깊이 효과를 확인하였다. 경계요소법의 다양한 결과를 효율적으로 활용하기 위해 박판 스플라인 보간 모델 기반의 조파기 근사모델을 개발하였다. 개발된 근사 모델의 타당성은 모델 테스트 결과 비교를 통해 확인하였다.

엎친언론, 덮친경찰! - 언론의 노조죽이기가 부른 노동자의 죽음

오승훈 한국비정규노동센터 2006 비정규 노동 Vol.54 No.-

IPTV 참여형방송 기술

오승훈,박일균,고석갑,이병탁,Oh, S.H.,Park, I.K.,Ko, S.K.,Lee, B.T. 한국전자통신연구원 2009 전자통신동향분석 Vol.24 No.1

본 고에서는 참여형 서비스 기술 동향을 먼저 소개하고 IPTV에서 시청자가 방송 영상에 실시간으로 참여할 수 있는 IPTV 참여형방송 기술에 대하여 기술한다. 본 기술은 IPTV가 가지고 있는 방송 특징과 양방향성을 고려하여 도출된 다음 요구사항을 반영하여 설계한 기술이다. 방송을 위한 방송예약 기능을 지원해야 하며 IPTV 시청자의 참여를 제어할 수 있는 절차가 잘 정의되어야 하고 이를 제어할 수 있는 호처리 프로토콜이 잘 설계되어야 한다. 끝으로 실시간 참여형방송 서비스를 위해서는 서비스 지연시간이 짧아야 한다. 이런 기능 및 성능 요구사항을 반영한 IPTV 참여형방송 시스템을 설계하고 실제 제품으로 개발 여 그 성능을 확인하였다.

Analysis and Design of Frequency Selectivity by Layered EBG and Metamaterial Structure

오승훈,강승택,김군태,Jeong-Hyeok Lee,김형석 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5

This paper analyzes and designs the electromagnetic band gap (EBG) geometry and metamaterial structure as periodically layered media to have the frequency selectivity showing bandpass and bandstop effects in microwave as wells sub-millimeter wave. Frequency responses of the transmission and reflection will be calculated by a modal-analysis based transfer matrix method and interpreted with effective refractive index,permittivity, and permeability as physical characteristics by a retrieval algorithm.

석유화학의 Upgrading Technology

오승훈 한국공업화학회 2004 한국공업화학회 연구논문 초록집 Vol.2004 No.1

Numerical Study on Characteristics and Control of Heading Angle of Floating LNG Bunkering Terminal for Improvement of Loading and Off-loading Performance

오승훈,Dong-Woo Jung,Yun-Ho Kim,Hyun-Uk Kwak,Jae-Hwan Jung,Sung-Jun Jung,Byeongwon Park,조석규,정동호,성홍근 한국해양공학회 2020 韓國海洋工學會誌 Vol.34 No.2

In this study, heading characteristics and heading control performances were evaluated to achieve the wave shield effect. The wave shield effect originating from heading control reduces the relative motions of moored vessels in a floating liquefied natural gas bunkering terminal (FLBT). Therefore, loading and off-loading performances are improved through reduced relative motion. For the objective of this study and efficiency of the analysis, a simplified model was used that assuming no relative motion of the moored vessels in the FLBT. The simplified model involved modeling the environmental loads and inertia of several floating bodies, including FLBT, into the environmental loads and inertia of a single vessel. The simplified model was validated through comparisons with model tests. With the simplified model, heading characteristics and heading control simulations were performed using low-frequency planar motion equations. The heading characteristics and heading control performances of FLBT were analyzed through the results of simulations under the expected environmental conditions. The capacity of the tunnel thrust for the heading control performance was confirmed to be adequate for improvement of the loading and off-loading performances using the wave shielding effects under the operation conditions.