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유한차분법에 의한 등분포 상재하중하 적층 복합재 경사판 해석
박원태,최재진,장석윤,Park, Weon Tae,Choi, Jae Jin,Chang, Suk Yoon 한국강구조학회 2000 韓國鋼構造學會 論文集 Vol.12 No.3
In recent years the development of high modulus, high strength and low density boron and graphite fibers bonded together has brought renewed interestes in structural elements. When a plate with arbitrarily oriented layers and clamped boundary conditions is subjected to uniform loading, it is difficult to analyze and apply, compared with isotropic and orthotropic cases. Therefore the numerical methods, such as finite difference method or finite element method, should be emloyed to analyse such problems. In this study the finite difference technique is used to formulate the bending analysis of symmetric composite laminated skew plates. When this technique is used to solve the problem, it is desirable to reduce the order of the derivatives in order to minimize the number of the pivotal points involved in each equation. The 4th order partial differential equations of laminated skew plates are converted to an equivalent three of 2nd order partial differential equations with three dependant variables. 복합적층 구조물에서 복합재료는 그 자체의 높은 강성, 강도와 내구성등의 특성을 갖고 있을 뿐 아니라, 구조물의 역학적 특성에 따라 얼마든지 재료의 특성을 합리적으로 구성하여 배치할 수 있는 매우 우수한 장점이 있다. 본 연구에서는 등분포로 재하된 복합적층경사판의 처짐에 관한 해석으로서 복합적층 경사판의 처짐을 나타내는 단일 4차 편미분방정식을 3개의 종속변수를 갖는 3원2차 연립방정식을 이용하여 해석하는 수치해석 법을 제시하였으며, 대칭 앵글-플라이 각도로 적층, 역대칭 앵글-플라이 각도로 적층, 비대칭 앵글-플라이 각도로 적층한 경우에 처짐과 단면력을 비교 검토하였다.
청주국제공항 활성화 방안 연구: 공항시설, 접근교통 및 운항 네트워크를 중심으로
박원태,임동균 한국항공운항학회 2024 한국항공운항학회지 Vol.32 No.1
In this study, we reviewed access transportation, operating companies, and airport infrastructure to revitalize Cheongju International Airport. Regarding access transportation infrastructure, it is necessary to promote a railway network connecting the metropolitan inland line and the central inland region. In addition, active administrative support from local governments is required to ensure smooth progress in railway and highway infrastructure linkage projects, such as the Osong Connecting Line and Chungbuk Line, high-speed rail network promotion, and expansion of the Chungbuk Eastern Axis Expressway and Central Expressway. Regarding operator access infrastructure, continuous efforts are required to add and attract airlines based at Cheongju International Airport. Regarding airport infrastructure, the Cheongju International Airport runway needs complete resurfacing due to its deterioration. Domestic passenger capacity has exceeded 6.5%, and considering the increase in import and export of high value-added goods in the North Chungcheong region, it is necessary to build and expand passenger terminals and cargo terminals. Cheongju International Airport's runway does not have enough runway length to operate large and ultra-large aircraft, so if it is extended from the existing 2,744m to 456m to 3,200m, several benefits can be expected in terms of revitalizing Cheongju Airport, such as route expansion.
박원태 청주대학교 산업과학연구소 2023 産業科學硏究 Vol.40 No.2
Survey at recent aircraft accidents, it can be seen that many accidents have occurred in unmanned aircraft. Unmanned aircraft accidents are carried out in various ways, and detailed analysis of accident cases is necessary to prevent such accidents. This study collected and analyzed cases of unmanned aerial vehicle accidents of the U.S. Air Force and the Korean military, which have been operating unmanned aerial vehicles for a long time. In addition, the flight test procedures and abnormal conditions of smart unmanned aerial vehicles(OPV) developed in Korea were collected and analyzed. And, military-level unmanned aircraft operated by the Army were investigated and analyzed by collecting mission profiles and procedures for abnormal situations. The investigated and analyzed accident risk factors of unmanned aerial vehicles were summarized and procedural considerations required in the flight test for final inspection of safety operation were presented.
박원태 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
Cracking in concrete abutment footing structures is one of the main issues of concrete abutment footing structural design. Thermal stress analysis is used to prevent the thermal crack of abutment footing mat. To avoid thermal crack, methods widely acceptable for practical use are pre-cooling, pipe cooling and control of placing height. The abutment footing mat model for the analysis is 7m x 14m area and 3m height. The analysis results are compared with method of control of lift height and method of pipe cooling. The analysis results show that thermal crack can be removed by method of placing control and pipe cooling at footing mat placed on the ground.
원격조종항공기조종사 적성검사에 관한 연구 (적성검사 항목선정을 중심으로)
박원태,이강석,Park, Won-Tae,Lee, Kang-Seok 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.1
Recently, the need of RPA(Remotely Piloted Aircraft) pilots is increasing rapidly with many requirements in order to be a beginner RPA pilot, including basic flight training, instrument flight qualification training, and aircraft type switching training. When RPA pilot gets disqualified, there will be generated much waste of efforts and expenses of trainees those pilots who are disqualified. Therefore, the methodology of pre-verifying those pilots who are not proper as RPA pilots through various scientific methods will save time and expenses with pre-reducing the pilots who will get disqualified later on. The methodology of aptitude test of RPA pilots is laid out as a consideration of pre-study of RPA pilots work analysis, and select types of aptitude test. A suitability of aptitude test is verified. In order to diagnose the flight aptitude precisely, it requires to be developed. Flight aptitude test tools might be connected with training program which could foster piloting aptitude with pre-diagnosing RPA pilot trainee selecting process. For that reason, we made an experiment in order to verify credibility and suitability of these selected programs with developing RPA pilot aptitude test tools. And also, we analyzed relationships among characteristics, analysis of data, and variables to verify the efficiency of data from prior experiment. Through this thesis, we expect to raise efficiency of flight training by providing pre-flight aptitude test information of RPA pilots.