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이승준,신인동,최수창,김용우,이종렬,이득우,Lee, Seung-Jun,Shin, In-Dong,Cha, Sao-Chang,Kim, Yong-Woo,Lee, Jong-Ryul,Lee, Deug-Woo 한국생산제조학회 2010 한국생산제조학회지 Vol.10 No.6
The development of high-speed spindle have been studied extensively for micro machining in advanced industrial countries. The research of miniaturized high-speed air spindle is important part which needs for the micro machining process of high quality. So, This study was to carry out results about design characteristics of miniaturized high-speed air spindle. We had designed 4type turbines and shaft. They were simulated in use the computer simulation programs. We made them as products. They measured RPM (revolutions per minute). As a result of experiments, there was a contrast among 4type Turbines. it reached 384,000rpm in 4.5bar of air pressure. And, We tried to compare the results of measurement whit the results of computer simulation.
고성능 DSP를 이용한 영상기울기 검출 시스템 구현에 관한 연구
이승준,이상범,Lee, Seung-Joon,Rhee, Sang-Burm 한국컴퓨터산업학회 2008 컴퓨터産業敎育學會論文誌 Vol.9 No.3
본 논문은 NTSC 카메라로 부터 획득한 컬러 이미지를 흑백 이미지로 변환하여 영상 경계선 검출 후 Hough 변환을 통하여 영상 기울기를 검출하는 시스템을 고성능 DSP를 이용하여 구현하였다. 검출된 영상 기울기는 서보모터를 제어하여 카메라 지지대를 기울여도 카메라를 반대로 기울여 항상 기울어지지 않는 영상이 얻어지는 시스템을 구현 하였다. This paper implement image gradient detection algorithm with high-performance DSP. First the NTSC color image convert to B/W image. The image gradient detect with Hough transform after edge detection image from the B/W images. The value of image gradient detection control the servo motor to original position of the NTSC camera if camera base to the left or right tilt.
이승준,Seung Jun Lee,M,D 대한안과학회 2007 대한안과학회지 Vol.48 No.8
Purpose: To report a rare case of bilateral pseudotumor with a two-week rapid spontaneous regression Method: A 63-year-old man visited our clinic with a chief complaint of a headache and right ocular pain. An orbital computerized tomography (CT) scan revealed a roud mass with well-demarcated capsule-like boundaries located in the inferior part of both orbits. After a systemic evaluation to exclude a systemic malignancy, we performed excisional biopsy of the right orbital mass to make diagnosis. Result: The right orbital mass was not found at the time of surgery for an excisional biopsy. Instead, we took multiple small biopsies of orbital fat, inferior rectus muscle, and adjacent soft tissues. Histologic examination revealed a non-specific inflammatory reaction without the presence of tumor cells. There was a marked spontaneous regression of the mass in both orbits on an immediate follow-up orbital CT. The patient began steroid treatment for 12 weeks under the presumptive diagnosis of bilateral pseudotumor. There was no evidence of recurrence at the eight-month follow-up.
기획특집2 - 초정밀 광학부품 기술 동향 -Polymer and Hybrid Optics
이승준,Lee, Seung-Jun 한국광학기기산업협회 2011 光學世界 Vol.135 No.-
광학 속성을 가진 폴리머 소재는 새롭고 정교한 전자광학 장치를 가능하게 해주고, 커머셜 마켓과 의학 용품, 바코드 인식, 보안과 지문 추출기, 동작 인식 센서, CCD 카메라 및 레이저 collimation 장치들을 가능하게 한다. 현재의 발전된 폴리머 기술과 인젝션 몰딩 기술은 높은 생산성과 정밀도를 향상시켜 왔다. 본 고는 이러한 폴리머-하이브리드 옵틱 기술에 관한 최신 동향으로서 Optronics 340호에서 발췌, 정리한 것이다.
연행작용을 고려한 우면산 토석류 모의 매개변수 특성분석
이승준,안현욱,김민석,임현택,Lee, Seungjun,An, Hyunuk,Kim, Minseok,Lim, Hyuntaek 한국수자원학회 2020 한국수자원학회논문집 Vol.53 No.9
The shallow landslide-trigerred debris flow in hillslope catchments is the primary geological phenomenon that drives landscape changes and therefore imposes risks as a natural hazard. In particular, debris flows occurring in urban areas can result to substantial damages to properties and human injuries during the flow and sediment transport process. To alleviate the damages as a result of these debris flow, analytical models for flow and damage prediction are of significant importance. However, the analysis of debris flow model parameters is not yet sufficient, and the analysis of the entrainment, which has a significant influence on the flow process and the damage extent, is still incomplete. In this study, the effects of erosion and erosion process on the flow and the impact area due to the change in the soil parameters are analyzed using Deb2D model, a flow analysis model of debris developed in Korea. The research is conducted for the case of the Mt. Umyeon landslide in 2011. The resulting impacted area, total debris-flow volume, maximum velocity and inundated depth from the Erosion model are compared to the field survey data. Also, the effect of the entrainment changing parameters is analyzed through the erosion shape and depth. The debris flow simulation for the Raemian and Shindong apartment catchment with the consideration of entrainment effect and erosion has been successful. Each parameter sensitivity could be analyzed through sensitivity analysis for the two basins based on the change in parameters, which indicates the necessity of parameter estimation.
이승준,구민세,정란,신동기,Lee, Seung-Joon,Koo, Min-Se,Chung, Lan,Shin, Dong-Ki 한국전산구조공학회 1991 전산구조공학 Vol.4 No.3
내진설계를 하고 있는 나라들이 채택하고 있는 내진해석방법중 가장 일반적인 응답스펙트럽법(Response Spectrum Method)은 지진하중을 정적 수평하중으로 치환하여 정적해석하는 것을 기본으로 하고 있다. 여기서 계산된 대치수평하중은 구조물의 소성화에 따른 비선형거동으로 부터 오는 에너지분산현상 및 감쇠(damping)현상 등을 고려하기 위하여 소위 반응수정계수(behavior factor)란 일정수로 나누어 준다. 응답스펙트럼법에 의한 내진설계의 정확도를 좌우하는 지금까지 사용되어지고 있는 반응수정계수는 정확한 계산값들이 아닌 경험적인 값들이다. 반응수정계수를 해석적으로 결정하기 위해서는 구조물의 극한상태에 대한 정의가 선결되어져야 한다. 본 논문에서는 지진하중하에서 강구조물의 한계상태를 기하학적측면과 사용성 측면 및 재료공학적 측면에서 검토하였고 3가지 형태의 구조물을 모델로 하여 반응수정계수를 계산하였다. The procedure of the elastic response spectrum method which is used in the codes of many countries involves the computation of a static horizontal substitute loading resulting from the earthquake. The substitute loading is divided by a behavioral factor in order to take energy dissipation due to the real nonlinear structural behavior and damping effects ect. into account. The behavioral factors widely used in many countries are based not on the exact calculation but only on the empirical data. In order to determine the behavioral factors analytically, it is necessary to define the limit state of structures as a first step. In this work, the methods of the determination of limit state for the steel structures are discussed in the geometric, serviceabile and material apsects, and the behavioral factors for the three types of structures are calculated.