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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Aviation and Aeronautics
Journal Basic Information
Journal DOI :
The Korean Society for Aviation and Aeronautics
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Volume & Issues
Volume 23, Issue 4 - Dec 2015
Volume 23, Issue 3 - Sep 2015
Volume 23, Issue 2 - Jun 2015
Volume 23, Issue 1 - Mar 2015
Selecting the target year
Efficiency Estimation on Propulsion System of an Electric Powered UAV
Ahn, Il-Young ; Yang, Yong-Man ; Ju, Young-Chul ; Park, SangHyuk ; Bae, Jae-Sung ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 1~7
DOI : 10.12985/ksaa.2015.23.3.001
In the present study, we conducted the research on the high efficiency propulsion system for the development of long-endurance UAV with an electric propulsion system. For the long endurance UAV, fair aerodynamic characteristics with the high efficiency of the propulsion system is required because the flight power and the duration time of the long-endurance UAV vary greatly depending on the efficiency of the propulsion system. Therefore, in this study, the tracking program which records the performance of motor, propeller was developed because of their wide variation in the efficiency depending on the using condition, and records from the existing flight test program were utilized to check the accuracy of the program we had developed. For the development of future long-endurance solar UAV, we confirmed the applied voltage of motor, the optimal rotation of propeller and the gear ratio of reduction gear in order to get the highest efficiency on the propulsion system at the optimal flying condition.
An Efficient Fluid-Thermal Integrated Analysis for Air-Intake Structure Design of a High Speed Air Vehicle
Chun, Hyung-Geun ; Ryu, Dong-Guk ; Lee, Jae-Woo ; Kim, Sang-Ho ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 8~17
DOI : 10.12985/ksaa.2015.23.3.008
In this research, low fidelity air/heat load analysis was conducted for the intake of high speed vehicle. For air/heat load calculations, aerodynamic properties at the surface and the boundary layer edge were estimated using Taylor-Maccoll equation for conical flow, shockwave relation and Prandtl-Meyer expansion equation for internal and external flow. Couette flow assumption and Reynolds analogy were used in order to calculate convective heat transfer coefficient. In order to calculate skin friction coefficient for heat transfer coefficient analysis, Van Driest method II and Reference Enthalpy method were considered. An axis symmetric SCRAMJET model was selected as a reference configuration for verifying the proper implementation of the present method. Comparison of the results using the present method and Computational Fluid Dynamic analysis showed that the present method is valuable for efficiently providing pressure and heat loads for air-intake structure design of the high speed air vehicle.
Expert-Novice Differences in Reading and Predicting Visual Information in Air Traffic Control
Kwon, Hyuk-Jin ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 18~27
DOI : 10.12985/ksaa.2015.23.3.018
Many studies have shown that having perception of spatial information is important for air traffic control officer (ATCO) since it helps them understand the current situation and predict the situation it leads to. However, little or no research has been done to investigate if there is any difference at the levels of expertise in perceiving spatial information and predicting a prospective situation. This study investigates the difference between expert and novice ATCO groups in how accurately each group of ATCO perceive spatial information such as position, altitude, speed, and flying direction, and predicting such information they will encounter shortly. In completing a task to watch the movement of airplanes displayed on the computer monitor as a blip, the participants were asked to predict the position, speed, and the altitude of the aircraft in a minute by marking on the sector map. The results show that the expert group performed better in accuracy and had tendency to overestimate on position and altitude; however, no significant difference was found between the two groups in terms of reading a flying direction. Therefore reading a flying direction may not be a reliable indicator to judge expertise of ATCO. But the expert group shows better predicting performance by perceiving spatial information such as airplane's position and altitude with feeling on time. The study suggests that it is important to enhance perceptive skills in ATCO training in improving their expertise in predicting accuracy traffic situation, preventing from air collision, and improving productivity for more efficient air traffic flow. A further study on the relationship between the perception of spatial information and the sense of time in predicting future information and effectiveness as an independent factor would contribute to providing more insights into expertise of ATCOs.
Study on Trajectory Prediction Accuracy Analysis Method for Performance Improvement of a Trajectory Prediction Module of Arrival Manager
Oh, Eun-Mi ; Kim, Hyounkyoung ; Eun, Yeonju ; Jeon, Daekeun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 28~34
DOI : 10.12985/ksaa.2015.23.3.028
An analysis method of trajectory prediction has been suggested and the developed trajectory prediction module, which is an important functional component of the Arrival Manager (AMAN) of Jeju airport, has been tested by applying the suggested method. The objective of this method is to improve prediction performance of the trajectory prediction module. The trajectory prediction module predicts the trajectories based on the real-time track data and flight plans. Therefore, the suggested analysis method includes the simulation framework which is based on real-time playback, recording, and graphic display systems for testing. Besides, the definition of time error, which is a important index for the time based scheduling system, such as AMAN, is included in the suggested analysis method. An example of arrival time prediction accuracy improvement through the suggested analysis method has also been presented.
Alternative Positioning, Navigation and Timing Using Multilateration in a Terminal Control Area
Jo, Sanghoon ; Kang, Ja-young ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 35~41
DOI : 10.12985/ksaa.2015.23.3.035
Multilateration(MLAT) is commonly used in civil and military surveillance applications to accurately locate an aircraft, vehicle or stationary emitter. MLAT calculates the TDOA of signals by transmitted aircraft and determines the aircraft's location. With more than four receivers it is possible to estimate the 3D position of the aircraft by calculating the intersection of the resulting hyperbolas and the system integrity. In this study, our objectives are to apply MLAT technique to Jeju terminal control area and to propose a MLAT receiver network to properly estimate the positions of aircraft approaching this area. Based on computer simulations, we determine locations of ground receivers in Jeju terminal control area, calculate estimated position errors of the aircraft with respect to the selected receiver networks, and find the best receiver network with the least position error.
A Study on the Improvement Plan of the Tax-Free System for Overseas Laborers : Focusing on International Air Crew
Lee, Ki Il ; Kim, Soo Ryun ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 42~52
DOI : 10.12985/ksaa.2015.23.3.042
Since the tax-free system for overseas laborers was implemented in 1974, the tax-free limits of international air crew, overseas construction workers and crewmen of deep-sea fishing ships and ocean-going ships had been identical by 2005, but there are big differences, currently. The Ministry of Strategy and Finance pointed out the poor working environments and international competitiveness of the industries to explain the reason for the differential tax-free limit. From this perspective, the fairness of the tax-free system for overseas laborers was analyzed. This is an empirical study, based on the objective fact. The study finding showed that international air crew were working in the structural flight work environments to threaten the right of health due to jet lag and excessive exposure to high-altitude cosmic radiation. Therefore, it was analyzed there should be a proper system reform to apply the tax-free limits to international air crew which are identical to those applied to overseas construction workers and crewmen of deep-sea fishing ships and ocean-going ships, for a fair taxation.
A Study on the Innovation Ambidexterity's Antecedents and Consequences of the Company Residing in the Airport
Choi, Kun-Hee ; Kang, Lae-Don ; You, Jung-Yun ; Park, Sung-Sik ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 53~63
DOI : 10.12985/ksaa.2015.23.3.053
This paper tries to find out antecedents and consequences of innovation ambidexterity among companies residing in the airport. To define antecedents, this paper regards such four variables as relationship orientation, market orientation, dynamic capabilities and level of resources. Such variables are assumed to have an effect on innovative ambidexterity and the innovative ambidexterity is also presumed to have an impact on company's marketing consequences. According to hypothesis test, the more a company has relationship orientation, market orientation, dynamic capabilities and level of resources, the more effective an innovation ambidexterity becomes and the bigger marketing performance could be expected. Therefore companies ought to maintain both exploration and utilization perspectives of innovation ambidexterity following the four variables above to expand new customer market and increase revenues.
Influence in the Management Performance by the Airport Safety Management System
Song, Jong-Sun ; Kim, Ki-Woong ; Lee, Yung-kil ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 64~80
DOI : 10.12985/ksaa.2015.23.3.064
In this article, we verify to influence in the management performance by the safety management system that is recommended by the ICAO for the safety management on the airside area in the airport. Also, We present a comprehensive mediator effect that the employees perceive safety culture and safety behavior. We design how participants were selected as study the employees from 4 airports on the airside areas of the Incheon International Airport, Gimpo International Airport, Jeju International Airport and Gimhae International Airport in the Korea using the simple random sampling method. The instrument for data collection was a questionnaire, and it was developed. Data analysis was to conduct structural equation modeling. Test of the hypotheses were verified to Maximum Likelihood Estimator. As a result of the analysis, safety behavior and risk management of the safety management system found out that affect management performance. Also, the employees of a high awareness about safety policy could be seen that is a high impact on management performance through a safety culture and a safety behavior. Safety behavior has significant mediator effect within the relationship between the safety management system and management performance. So, We provide guidance of the safety policies for the safety management on the airside area in the airport.
A Study on Result Differences of Flight's Weight and Balance by Load Master
Lee, Gyu-Jin ; Lee, Yun-Cheol ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 81~87
DOI : 10.12985/ksaa.2015.23.3.081
Load master is authorized to be controlled all of loading stuffs for safety of flight such as passenger, baggage, cargo and e.t.c. There are many things are missed even though the weight and balance is the most important process. This study analyzes how the differences of C.G. by among ten load masters of each careers. This study is tested how load-master takes load-control by the respective result based on differences of each practical experiences, gender and a number of certification. In result, all of load masters set C.G. on the stability region. But the practical experience of load master is relative to set better C.G. for economical effectiveness of weight and balance control work.
A Study on Degree of Perception Changes of Korean National Carriers' Pilots in Safety Culture
Moon, Bong-Sub ; Kim, Ki-Woong ; Choi, Youn-Chul ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 88~93
DOI : 10.12985/ksaa.2015.23.3.088
Among other various aspects of safety culture, this research has considered safety culture from the view of aviation. A tool to examine aviation safety culture has been developed on the basis of Global Aviation Safety Network's safety culture survey. Using this tool, the degree of perception of Korean national carriers' pilots in safety culture has been examined three times for the period from 2002 to 2015. Compared to an initial result of the survey in 2002, results in 2008 and 2015 demonstrate that safety culture among pilots has rapidly changed from negative and bureaucratic to positive. Hence, it is expected that positive index of safety culture will increase 28% (total approximate 90%) in 2020.
A Study on Self-Efficacy and Academic Adjustment Among the Aviation-related College Students
Bae, Shin-Young ;
Journal of the Korean Society for Aviation and Aeronautics, volume 23, issue 3, 2015, Pages 94~104
DOI : 10.12985/ksaa.2015.23.3.094
Recently the departments of aviation-related in the college are increased as the aviation industry is rapidly expanded. To enhance their competitiveness and have differentiation, it is emphasized for each department to manage and teach their students well. Therefore this study aims to examine self-efficacy and academic adjustment of aviation-related college students and investigate the relationship between self-efficacy and academic adjustment. To achieve the objectives, it conducted a survey of aviation-related college students in C university from Apr. 27th. 2015 to May. 22th. 2015. A total of 225 questionnaires were analyzed using SPSS 18.0 statistical package program and frequency analysis, factor analysis, reliability analysis, multiple regression analysis, correlation analysis and one-way ANOVA were conducted. The result released that general self-efficacy was recognized higher at the department of aviation operation than aviation maintenance and aviation service and social self-efficacy was recognized higher at the department of aviation service than aviation maintenance and aviation operation. Also general self-efficacy had an influence on the motivation, application and performance and social self-efficacy affected motivation, performance and academic environment. The implication of these findings would help to manage aviation-related college students, develop their departments and provide the directions for future research.