자연섬유 복합재료 풍력 발전 시스템 블레이드 제작 및 구조 시험 연구

박현범 항공우주시스템공학회 2017 항공우주시스템공학회지 Vol.11 No.4

In this work, a manufacturing and structural test of 1kW class horizontal axis wind turbine blade using natural-fiber composite was performed. The aerodynamic design of blade was performed after investigation on design requirement. The structural design load was investigated after aerodynamic design of blade. And also, structural design of blade was carried out. The structural design of blade was carried out using the simplified methods such as the netting rule and the rule of mixture applied to composite. The structural safety of the designed blade structure is investigated through the various load cases, stress, deformation and buckling analyses using the FEM method. Finally, the blade manufacturing and structural test using natural composite was carried out. 본 연구에서는 자연섬유 복합재료를 적용하여 1kW급 수평축 소형 풍력 발전 시스템 블레이드의 제작과 구조 시험 연구를 수행하였다. 블레이드의 설계 요구 조건을 분석하여 공력 설계를 수행하였다. 공력 설계 이후 구조 설계 하중을 도출하고 블레이드의 구조 설계를 수행하였다. 블레이드의 구조 설계기법은 복합재료를 적용한 단순 설계 기법과 혼합 설계 기법을 적용하였다. 설계된 블레이드의 구조 안전성은 다양한 하중조건, 변위, 좌굴 등의 해석을 위해 유한요소기법으로 분석하였다. 최종 자연 섬유를적용한 블레이들 제작하였으며, 구조 시험을 수행하였다.

웹 애플리케이션 개발을 위한 반응형 웹과 Lazy Loading 컴포넌트 설계

박현범,김차종,Park, Hyeonbeom,Kim, Chajong 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.5

본 논문은 컴포넌트 기반의 반응형 웹 애플리케이션 개발을 위하여 다양한 디바이스에 맞추어 해상도나 화면 크기에 따라 콘텐츠가 동적으로 변환될 수 있도록 디바이스 유형별 편집 기능 크기 및 위치 조정, 숨김 및 표시, 스타일 편집, 디바이스 유형별 편집 등을 설계하였고, 생성된 디바이스 정보를 컴포넌트에 저장하는 것을 제안하였다. 또한 웹 애플리케이션의 뷰 개선과 동시에 서버의 처리 속도 향상을 위하여 lazy loading 기법을 적용한 컴포넌트를 설계하였다. 본 논문에서 제안한 반응형 웹 기능과 서버의 처리 속도 개선 여부를 모니터링 툴을 통해 실험한 결과 웹 기능이 다양한 디바이스에 반응하였고 대부분의 브라우저에서 처리속도가 향상됨을 확인하였다. In this paper, we designed the editing function size and position adjustment, hiding and displaying, style editing, edit by device type etc. for each device type so that contents can be dynamically converted according to resolution or screen size according to various devices. and to be able to respond to various devices by storing device information in a component created through editing function. To improve the viewer of the web application and to improve the processing speed of the server, a component using the lazy loading technique was designed. in this paper, responsive web functionality and improve server throunghput results show that the response function of the Web function and the improvement of the processing speed of the server are improved by the monitoring tool, and the processing speed is improved in most browsers.

자동차 배기계 센서 구성품의 진동 안정성 해석

박현범 항공우주시스템공학회 2017 항공우주시스템공학회지 Vol.11 No.4

This work dealt with vibration stability analysis of automotive exhaust sensor. In this work, structural design and analysis of exhaust gas sensor of automobile system were performed. Firstly, structural design requirement of automobile exhaust system was investigated. After structural design, the structural analysis of the exhaust measurement sensor system were performed usig the finite element analysis method. It was performed that the vibration and thermal stress analysis at the high temperature condition. After structural test of target structure, structural test results were compared with analysis results. Through the structural analysis, it was confirmed that the designed measurement sensor structure is safety. 본 연구는 자동차 배기계 센서 구성품의 진동 안정성 해석에 관한 연구이다. 본 연구에서 자동차 시스템의 배기 가스 센서의 구조 설계 및 해석을 수행하였다. 1차적으로 자동차 배기 시스템의 구조 설계요구 조건이 분석되었다. 구조 설계 이후 유한 요소 해석 기법을 활용하여 배기계 측정 센서 시스템의구조 해석이 수행되었다. 고온 조건에서 진동 및 열응력 해석이 수행되었다. 최종 센서 시스템의 구조시험을 수행한 후 해석 결과와 비교하였다. 구조 해석을 통해 설계된 센서 구성품은 안전한 것으로 확인되었다.

Coexistence of Solitary Rectal Ulcer Syndrome and Ulcerative Colitis: A Case Report and Literature Review

박현범,박형철,정조윤,김정일,명대성,조성범,이완식,주영은 대한장연구학회 2014 Intestinal Research Vol.12 No.1

Solitary rectal ulcer syndrome (SRUS) is an uncommon benign disease that is misdiagnosed as malignancy or inflammatory bowel disease because of similarities in clinical and endoscopic manifestations. Furthermore, SRUS with ulcerative colitis (UC) is extremely rare. To date, two cases have been reported in the medical literature. We report an additional case of SRUS with UC that was misdiagnosed as rectal cancer. A 61-year-old man was admitted to our hospital with rectal bleeding. Colonoscopy showed a well-demarcated, shallow, ulcerative lesion with polypoidal growth involving the entire circumference of the rectal lumen. Findings from imaging studies, including abdominal computed tomography (CT) and positron emission tomography (PET)/CT resembled those of rectal cancer. Surgical resection was performed because clinical symptoms persisted despite medical treatment and because occult rectal cancer could not be ruled out. Histopathological examination of the resected specimen revealed fibromuscular obliteration of the lamina propria and crypt abscesses, characteristics compatible with SRUS and UC.

Drug Fever Due to Piperacillin/Tazobactam Loaded into Bone Cement

박현범,최준석,박상훈,기원주,고영일 대한의학회 2011 Journal of Korean medical science Vol.26 No.2

Although drug fever may develop after administration of the drug by various routes, it has not been reported with antibiotic-loaded bone cement. Here, a case of drug fever induced by piperacillin/tazobactam loaded into bone cement is reported. A 72-yr-old woman presented with fever that developed two weeks after insertion of bone cement loaded with antibiotics including piperacillin/tazobactam into the knee joint for infectious arthritis. The fever was associated with a skin rash and blood eosinophilia. The work-up of the fever excluded several causes. Drug provocation test demonstrated that the piperacillin/tazobactam, which had been loaded in the bone cement, was the cause of the fever. The findings of this case suggest that drug fever can be induced by any drug placed and released continuously within the body. Therefore, the evaluation for possible drug fever should include all drugs the patient has been exposed to regardless of the route of administration.

VARTM 공법으로 제작된 자연섬유 복합재료의 기계적 특성 분석

박현범,Park, Hyunbum 항공우주시스템공학회 2016 항공우주시스템공학회지 Vol.10 No.3

In this study, an investigation was performed on the mechanical properties of the natural-fiber-composite structure. The specimen was manufactured using the Vacuum Assisted Resin Transfer Molding (VARTM) method. The flax-fiber materials were adopted for the natural fiber composite, and vinyl-ester resin was also adopted. After a manufactured specimen was obtained, a mechanical test was carried out. The mechanical properties of the experiment results were compared with those of the natural-composite data cited from a number of other references.

복합재료 유체 저장 탱크 구조 설계를 위한 RTM 공법 수지 유동 해석

박현범 항공우주시스템공학회 2019 항공우주시스템공학회지 Vol.13 No.1

본 연구에서 복합재료 구조 설계를 위한 수지 이송 성형 공법의 수지 침투 유동 해석을 수행하였다. 대상 복합재료 구조물은 유체 저장 탱크 구조물이다. 유체 저장 탱크 복합재료 구조물 설계를 위해 자연 섬유 복합재료가 적용되었다. 자연섬유 복합재 구조의 제작을 위해 수지 이송 성형 공법을 채택하였다. 탱크의 적절한 RTM 조건을 도출하기 위하여 수지 침투 유동 해석을 수행하였다. 수지 유동 해석은 상용 유한 요소 해석 시뮬레이션 프로그램을 활용하여 수행하였다. 수지 주입구와 배출구의 다양한 변경에 따른 반복적 해석을 수행하여 최적의 수지 주입 시간과 위치를 결정하였다. In this study, resin flow analysis of resin transfer moulding (RTM) method was performed for mould design of composite structure. The target composite structure was a tank used for fluid storage. Natural c fiber composite was adopted for composite structural design of the fluid storage tank. RTM was adopted for manufacturing of the tank using natural fiber composites. Resin flow analysis was performed to find the proper RTM conditions of the tank. The resin flow analysis was performed using the commercial FEM flow simulation software. After repeated analysis while changing the location of resin inlet and outlet, the proper resin filling time and pattern were found.

수직축 풍력 블레이드의 복합재 적용 설계, 제작 및 시험 평가 연구

박현범 항공우주시스템공학회 2018 항공우주시스템공학회지 Vol.12 No.3

본 연구는 수직축 풍력 발전 시스템의 복합재 블레이드에 대한 설계 및 제작 연구이다. 본 연구에서수직축 풍력 발전용 복합재 블레이드의 공력 및 구조 설계를 수행하였다. 1차적으로 복합재 블레이드의공력 및 구조 설계 요구 조건이 분석되었다. 구조 설계 이후 유한 요소 해석 기법을 활용하여 풍력 블레이드 구조의 구조 해석이 수행되었다. 적용 하중 조건에서 응력 및 변위 해석이 수행되었다. 단계적구조 해석을 통해 취약 부위의 개선 설계 방안을 제시하였다. 구조 해석을 통해 최종 설계된 블레이드구조는 안전한 것으로 확인되었다. This work dealt with the design and manufacturing of composite blades of a vertical axis wind turbine system. In this work, aerodynamic and structural designs of sandwich composite blades for a vertical axis wind turbine system were performed. First, the aerodynamic and structural design requirements of the composite blades were investigated. After the structural design was complete, a structural analysis of the wind turbine blades was performed using the finite element analysis method. It was performed with the stress and displacement analysis at the applied load condition. A design modification for the structurally weak part was proposed as a result of the structural analysis. Through another structural analysis, it was confirmed that the final designed blade structure is safe.

샌드위치 복합재 바닥 구조물의 구조 설계 및 해석

박현범 항공우주시스템공학회 2017 항공우주시스템공학회지 Vol.11 No.6

This work dealt with structural safety analysis about sandwich composite structure of automotive floor board. In this work, structural design and analysis of sandwich composite structure for automobile floor board were performed. Firstly, structural design requirement of automobile floor board was investigated. After structural design, the structural analysis of the automobile floor board were performed by the finite element analysis method. It was performed that the stress and displacement analysis at the applied load condition. After structural test of target structure, structural test results were compared with analysis results. Through the structural analysis, it was confirmed that the designed floor board structure is safety. 본 연구는 자동차 바닥 구조로 적용된 샌드위치 복합재 구조의 안전성 해석에 관한 연구이다. 본 연구에서 샌드위치 복합재 구조 적용 자동차 바닥의 구조 설계 및 해석을 수행하였다. 1차적으로 자동차바닥 구조의 구조 설계 요구 조건이 분석되었다. 구조 설계 이후 유한 요소 해석 기법을 활용하여 자동차 바닥 구조의 구조 해석이 수행되었다. 적용 하중 조건에서 응력 및 변위 해석이 수행되었다. 최종바닥 구조의 구조 시험을 수행한 후 해석 결과와 비교하였다. 구조 해석을 통해 설계된 샌드위치 복합재 바닥 구조는 안전한 것으로 확인되었다.

Structural Design and Analysis of Connecting Part for Vertical Wind Turbine System Blade

박현범 항공우주시스템공학회 2020 항공우주시스템공학회지 Vol.14 No.2

This work is intended to develop a flapping-type vertical wind turbine system that will be applicable to diesel generators and wind turbine generator hybrid systems. In the aerodynamic design of the wind turbine blade, parametric studies were performed to determine an optimum aerodynamic configuration. After the aerodynamic design, the structural design of the blade was performed. The major structural components of the flapping-type wind turbine are the flapping blade, the connecting part, and the stopper. The primary focus of this work is the design and analysis of the connecting part. Structural tests were performed to evaluate the blade design, and the test results were compared with the results of the analysis.