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Tyan, M.,Nguyen, N. V.,Kim, S.,Lee, J.-W. American Institute of Aeronautics and Astronautics 2017 Journal of aircraft Vol. No.
<P>Aircraft conceptual design traditionally uses simplified analysis and optimization methods to generate the basic configuration of the aircraft. Analysis methods cannot fully represent the real physical phenomena, and hence the optimum solution may fail to satisfy the constraints when more sophisticated analysis is applied. This research proposes the use of a database to estimate the prediction errors associated with a particular analysis method. Newly proposed adaptive piecewise-linear fuzzy membership functions accurately represent the intervals of prediction errors to compensate for the discrepancies caused by analysis. A possibility-based design optimization framework is developed to solve nonprobabilistic design problems with uncertainties represented by the adaptive piecewise-linear fuzzy membership intervals. A two-seater light aircraft design problem has been solved to demonstrate the proposed method. The adaptive piecewise-linear fuzzy membership fu\nctions for six major analysis modules of in-house software were constructed using information about 15 aircraft stored in the database. Estimated errors of the analysis stay within 10% range. The adaptive piecewise-linear fuzzy membership function for selected parameters stores 39% more samples on average than the triangular functions that are traditionally used for possibility-based design optimization. The results of the design problem show that the objective function is improved by 3.4% with uncertain intervals covering 100% of database samples and by 46.1% with 12.3% database coverage.</P>
Comprehensive preliminary sizing/resizing method for a fixed wing – VTOL electric UAV
Tyan, Maxim,Nguyen, Nhu Van,Kim, Sangho,Lee, Jae-Woo Elsevier 2017 AEROSPACE SCIENCE AND TECHNOLOGY Vol.71 No.-
<P><B>Abstract</B></P> <P>A Fixed Wing (FW) aircraft with Vertical Takeoff and Landing (VTOL) is a new type of aircraft that inherits the hovering, VTOL, and maneuvering properties of multicopters and the power-efficient cruising of an FW aircraft. This paper presents a comprehensive method for FW-VTOL electric UAV sizing and resizing. The method uses newly developed integrated analysis that combines the VTOL propulsion sizing method with modified FW aircraft sizing theories. Performance requirements are specified as a set of functional relations. Several new empirical equations are derived using available data. The required battery capacity and total mass are determined from mission analysis that includes both VTOL and FW mission segments. The design is iteratively resized when the actual components of the propulsion system are selected. A case study of a 3.5-kg FW-VTOL electric UAV is presented in this research. The results of sizing and resizing are compared to parameters of the actual aircraft manufactured. Prediction of most parameters stays within a 10% error threshold.</P>
Do institutional designs matter for planning review? A garbage-can simulation approach
Feng-Tyan Lin,Shih-Kung Lai 서울시립대학교 도시과학연구원 2022 도시과학국제저널 Vol.26 No.3
The fact that institutional design coordinates decisions are not a new idea, but the study of its effectiveness under different settings is still unrevealed. In this paper, inspired by the garbage-can model, we conduct a set of computer simulations of collective decision making based on urban land use planning and design review process. The simulation results show that institutional designs matter in affecting organizational performance, and that different distributions of case intricacies result in different outcomes of the collective decision making for planning review.
Integrated Analysis, Design and Optimization Program Development for Advanced Air Mobility Aircraft
Maxim Tyan(장막심),JaeLyun Lee(이재륜),MinJi Kim(김민지),Woon Jae Won(원운재),Yeonju Choi(최연주),Zin Win Thu,Ki Joon Byeon(변기준),Seong Joong Park(박성중),Jae-Woo Lee(이재우) 한국항공우주학회 2022 한국항공우주학회 학술발표회 논문집 Vol.2022 No.11
Integrated Analysis Program Development for Light Aircraft Preliminary Design Stage
Maxim Tyan,Daniel Neufeld,Jae-Woo Lee,Sangho Kim 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.4
A comprehensive program development using a multi-disciplinary approach for propeller driven aircraft analysis, design and optimization is presented in this paper. The program consists of a worksheet format database with a data processing module along with modules for aerodynamic, propulsion, mission, weight and geometry analysis, and 3D geometry display. The program was written using object oriented programming to enhance exibility and extensibility compared to functional programming approach. Additional analysis modules and design optimization extensions can be written and integrated easily. The developed program source code is being continuously optimized to reduce computational time and improve effciency. Most of the methods used in current program were used for conceptual and preliminary design of the KLA-100, a new VLA category aircraft. The accuracy of the analysis methods was validated using experimental and published data.
Maxim Tyan,Sangho Kim,Jae-Woo Lee,Soo-Hyung Park,Young-Il Jang 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11
KLA-100 is a single engine, 2 seat general aviation aircraft which is being developed by Light Aircraft Development Center at Konkuk University for obtaining the certification of KAS-VLA for the first time in Korea. The progress in aircraft configuration design for the very light aircraft development is described in the present paper. In particular, an advanced configuration design methods which has been established during the conceptual and the preliminary design stages are presented. The advanced configuration design method is systematically and effectively composed of system engineering based requirement analysis and alternative configurations determination, initial sizing and conceptual design tool, parameter based configuration generation method, computational fluid dynamics, wind tunnel testing, and design-certification integration methods.
Inessa Tyan,Namho Chung,Chulmo Koo 한국경영정보학회 2015 한국경영정보학회 학술대회논문집 Vol.2015 No.11
This study is another attempt to elucidate the importance of information technologies within tourism industry and emphasize the significance of the smart tourism research. The research is aimed to investigate the relationship between the museum visitors’ perceptions towards corporate social responsibility (CSR) and their word-of-mouth (WOM) intentions from the perspective of technology based eco-innovation. The present study introduces a theoretical model based on the stakeholder’s theory and proposes the positive relationship between technology based eco-innovation, museum visitors’ CSR perceptions and visitors’ WOM intentions. The results of the present research will bring in important theoretical and practical contributions filling gap in the understanding of the antecedents and consequences of CSR and providing more complete knowledge about the possible impact of CSR on the sustainability of the tourism business through exploring the factors determining visitors’ WOM intentions.