유도조종 시스템 성능 평가를 위한 HILS 컴퓨터에 관한 연구

심형식(Hyung-Sik Shim),김민희(Min-Hee Kim),김영주(Young-Joo Kim) 한국항공우주학회 1993 한국항공우주학회 학술발표회 논문집 Vol.- No.-

엔진 쿨링팬의 후류 분석을 통한 쉬라우드 스테이터 설계

심헌수(Hunsu Shim),김민수(Minsu Kim),김혜진(Hye-Jin Kim),강형식(Hyung-Sik Kang) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7

In this study, the performance of an Engine Cooling Fan (ECF) is investigated by unsteady CFD analysis and the flow characteristic around a stator, which connects a motor fixed region and a shroud body, was observed. A velocity vector after a fan blade is variously distributed from the fan hub to the tip and generates large vortex around the stator that was designed at a fixed stagger angle according to the radius direction. These large generated vortex reduces the cooling performance and the system efficiency of the ECF, besides causes increasing an aero-acoustic noise. A cooling fan is a main part in an engine cooling system, but a method was considered that could be increased the cooling performance by the only improvement the stator. A detach angle after the fan blade by unsteady CFD analysis was extracted in the range from the hub to the tip and applied to design as the stagger angle of the stator. A designed stator model by these method was predicted by unsteady CFD analysis and its result was compared with the result of the initial model. According to the results of the initial and improved models, the vortex around the improved model stator was significantly reduced as against the initial model stator’s and the air flow rate with the same cooling fan was increased about 3% through the test.

소형 헬리콥터 로터 모델 충실도 향상 및 호버링 검증

최형식,유동일,심현철 한국항공우주학회 2012 한국항공우주학회 학술발표회 논문집 Vol.2012 No.11

기존의 소형helicopter 운동model은 시계방향회전의 reduced rotor model이며, off axis 에 대한 반응을 고려하지 않은 식을 사용하여 왔다. 본 논문에서는 기존의 reduced rotor model의 향상방안으로 rotor 회전방향 변경이 자유롭고, rotor의 off-axis 반응을 개선한 rotor model에 대해 다루기로 한다. 또한 기존 rotor 추력계산에 사용되는 iterative method을 대체하는 dynamic inflow를 적용하였으며 비선형시뮬레이션 결과와 비행시험데이터를 비교하여 만족스러운 결과가 나타남을 확인하였다. The traditional flight mechanics for scale helicopters uses a counter-clockwise, reduced-order rotor model that does not account for off-axis responses. The present paper deals with an improved rotor model that can set different directions of rotation and also reflects the off-axis responses of the rotor. In addition, the iterative method, which is used for rotor thrust calculations, is replaced with the dynamic inflow model. The nonlinear simulation results correlate well with the flight test results.)

내도복 다수성 검정깨 신품종 "윤흑"

심강보,황정동,배석복,이명희,정찬식,하태정,박금룡,노재환,송득영,이세종,남상영,이재철,최규환,권중배,강달순,강형식 한국육종학회 2011 한국육종학회지 Vol.43 No.6

윤흑'은 내병성이 개선되고 다수성인 품종을 육성하기 위하여 다수성 계통인 유성깨에 고품질 내병성인 건흑깨를 1995년에 인공교배하여 육성한 품종으로 6년간의 계통육성을 통하여 유망계통을 선발하고 2002년부터 3년간 생산력 검정시험을 거친 후 전국 9개의 지역에서 3년간의 적응시험을 통하여 선발된 것으로 '윤흑'은 수량성이 높고 내도복성이면서 검정색 착색도가 진하고 레놀렌산 함량이 많은 고품질 품종이다. 또한 우리나라 기후조건에서 단작 및 이모작형의 광 A new sesame variety 'Yunheuk' was developed from Yeongnam Agricultural Research Institute in 2007. A cross was made by 'Yoosung' with weak disease resistance and 'Kunheuk'with high yield capacity & quality, followed by pedigree selection, yield test and regional yield trial (RYT) by the sesame breeding team at the National Institute of Crop Science and Yeongnam Agricultural Research Institute up to 2007. The variety showed higher lodging resistance and more dark seed coloring rather than that of check variety 'Yangheuk' Average stem length and the number of capsules per plant is 118 cm, 79 cm respectively. Its 1,000 grains weight is about 2.67 g indicating 0.10 g lower than that of 'Yangheuk' and its oil content is about 46.4%. 'Yunheuk'also contains total 2.59 mg/g of such lignans as sesamin and sesamolin. And its dark color density (L* Value) of seed coat is 22.43 which was about 10% lower than that of check variety. The average yield of 'Yunheuk'was 99.9 kg per 10a at the national-wide regional performance.

아미노산 고함유 다수성 검정깨 신품종 "미흑"

심강보,황정동,박금룡,노재환,김선림,이세종,남상영,이재철,최규환,정병준,권중배,강달순,강형식 한국육종학회 2012 한국육종학회지 Vol.44 No.1

미흑깨'는 2006년에 국립작물과학원 영남농업연구소에서 육성한 품종으로 내병성은 약하지만 다수성 품종인 '유성깨'에 내병성이 강하면서 다수성인 '수원131호'를 교배한 후대에 고품질 다수성인 '경북1호'를 1994년에 3원교잡하여 육성한 품종으로 표준품종에 비하여 수량성이 높고 총아미노산 함량이 많으면서 검정색 착색도가 진한 고품질 품종이다. 경장은 125 cm이고, 주당 삭수는 77개이다. 1,000립중은 2.57 g이고 기름함량은 표준품종보다 약 4 A new sesame variety 'Miheuk' was developed from Yeongnam Agricultural Research Institute in 2006. Cross was made by 'Kyeongbuk 1' with high quality and F1 line of 'Yoosung' with weak disease resistance and 'Suwon131' with high yields capacity & disease resistance, followed by pedigree selection, yield test and RYT by the sesame breeding team at the National Institute of Crop Science and Yeongnam Agricultural Research Institute from 1999 to 2006 to 2006. The variety shows higher amino acid content and more dark seed coloring than that of check variety 'Yangheuk'. Average stem length and the number of capsules per plant were 125cm, 77 respectively. It's 1000 grains weight was about 2.57 g indicating 0.20 g lower than that of 'Yangheuk', and it's oil content is about 45.8% which is about 4% higher than that of check variety. 'Miheuk' also contained 17,000 mg/100 g of total amino acids. And it's dark color density (L* Value) of seed coat is 22.87 which is about 15% lower than that of check variety. The average yield of 'Miheuk' is 96.8 kg per 10a at the national-wide regional performance.

TDC(Time Delay Control) 비선형 강건 제어기법을 이용한 항공기 SCAS 설계

최형식,이장호,이상종,김응태,심현철 한국항공우주학회 2010 한국항공우주학회 학술발표회 논문집 Vol.2010 No.11

Fault Tolerant Control of Hexacopter for Actuator Faults using Time Delay Control Method

이장호,최형식,심현철 한국항공우주학회 2016 International Journal of Aeronautical and Space Sc Vol.17 No.1

A novel attitude tacking control method using Time Delay Control (TDC) scheme is developed to provide robust controllability of a rigid hexacopter in case of single or multiple rotor faults. When the TDC scheme is developed, the rotor faults such as the abrupt and/or incipient rotor faults are considered as model uncertainties. The kinematics, modeling of rigid dynamics of hexacopter, and design of stability and controllability augmentation system (SCAS) are addressed rigorously in this paper. In order to compare the developed control scheme to a conventional control method, a nonlinear numerical simulation has been performed and the attitude tracking performance has been compared between the two methods considering the single and multiple rotor faults cases. The developed control scheme shows superior stability and robust controllability of a hexacopter that is subjected to one or multiple rotor faults and external disturbance, i.e., wind shear, gust, and turbulence.

데이터 시각화를 통한 청주시 지역화폐 현황분석과 활성화 방안 연구

박유희,심형식,조완섭 충북대학교 국제개발연구소 2023 사회적경제와 정책연구 Vol.13 No.2

In this paper, we analyze the transaction history data of the local currency Cheong-ju Love Gift Certificate(Cheong-ju Pay) issued in Cheong-ju City to identify the current status of utilization and seek ways to vitalize this local currency. After storing about 90 million records of data in databases and BI(Business Intelligence) tools, we analyzed the data with a star-schema type structure suitable for multi-dimensional analysis. Including the overall outline of the data, we focus on our analysis as it relates to the administrative dong and store types, discuss the existing local currency, and present how to vitalize this currency in the future. 본 논문에서는 청주지역에서 발행하는 지역화폐 청주사랑상품권(청주페이)의 거래 내역 관련 데이터를 전수 분석해 활용 현황을 살펴보고 활성화 방안을 모색하였다. 약 9,000만 건의 데이터를 데이터베이스 및 BI도구에 저장한 후 다차원 분석에 적합한 스타스키마 형태의 분석 데이터 구조를 사용해 분석했다. 데이터의 전반적인 개요와 읍면동에 따른 거주민 결제액 · 가맹점 매출액 및 인구수 대비 분석과 가맹점 유형에 따른 분석에 초점을 두었으며, 지역화폐에 대한 기존 논점과 함께 정리함으로써 향후 활성화 방향을 제시하였다.

고고도장기체공 무인기 대기자료시스템의 고장검출 기법에 관한 연구

이장호,최형식,유혁,심현철 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11

대기자료시스템(ADS)은 항공기의 대기속도, 압력고도와 풍향을 측정하는 장치로서, 일반적으로 대기자료 획득을 위해서 피토관을 장착한다. ADS를 통해 획득한 대기속도와 고도 정보는 항법 성능에 결정적인 영향을 주는 요소이다. 하지만, 대기환경에 따라 피토관에 결빙 또는 물방울이 응결되면 비정상적인 대기자료를 자동비행장치에 전달하여 항공기에 치명적인 손실을 발생시키기도 한다. 본 논문에서는 고고도 장기체공 전기무인기(HALE EAV)의 ADS에 고장이 발생하였을 경우 이를 탐지 및 분리하는 알고리듬을 제안하였다. 기존 기법은 고장검출에 소요되는 시간이 많이 걸리는 단점을 갖고 있으나, 이러한 단점을 보완하기 위해 관측기를 이용한 상태추정 기법을 결합한 고장검출 알고리듬을 제안한다. 제안된 기법을 통해 ADS 센서 통계치와 선형모델 기반 상태 관측기를 통해 대기속도 및 압력고도를 추정하여 HALE EAV의 ADS 고장검출 성능을 향상시켰다. HALE EAV의 비행시험 데이터를 이용하여 제안된 ADS 고장검출 기법의 성능을 확인하였다.

다가올 미래 나는 안전한가 - 미래 안전 위협에 대한 주관적 평가요인 탐색 -

김다영,심형식,이민규 (사)위기관리이론과실천 2023 Crisisonomy Vol.19 No.4

As concerns have been raised about the potential negative impacts of future safety threats on individuals' lives, this study aimed to explore the factors that influence perceptions of the future in the present moment. Using multiple regression analysis in Stata 17 SE, the study was based on variables related to social perspectives, willingness to participate in social activities, and evaluations of corporate activities. The results showed that individuals who held positive social values tended to evaluate the negative impacts of future safety threats on their lives as less severe. On the other hand, individuals who tended to participate in various activities to solve social problems tended to evaluate the negative impacts of future safety threats on their lives as more severe. The continued prominence of "safety" as a social issue reflects the increasing need for institutional improvements based on societal understanding. In this regard, the significance of this study lies in its empirical research on individual perceptions of safety awareness formed based on various backgrounds.