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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Society for Aviation and Aeronautics
Journal Basic Information
Journal DOI :
The Korean Society for Aviation and Aeronautics
Editor in Chief :
Volume & Issues
Volume 14, Issue 4 - Dec 2006
Volume 14, Issue 3 - Sep 2006
Volume 14, Issue 2 - Jun 2006
Volume 14, Issue 1 - Mar 2006
Selecting the target year
A Numerical Study on the Ground Effect of a Circular Cylinder in the Presence of a Moving Wall
Jung, Jae-Yoon ; Chang, Jo-Won ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 1~10
A computational study was carried out in order to investigate the ground effect of a circular cylinder in the presence of a moving wall at a Reynolds number of 2.0
104. The viscous-incompressible Navier-Stokes equations and Spalart-Allmaras turbulent model of the commercial CFD code were adopted for this numerical analysis. The moving wall was set parallel with the freestream, and the speed of motion was equal to the freestream velocity. The gap ratio is defined as the distance ratio between the circular cylinder diameter and the height from the moving wall. The numerical results show that there are the differences among the each of the stages in evidence of the vorticity contours and the polar diagrams of
. The 4 stages of the gap ratio are defined according to the flow features, whose stages are divided into small, intermediate, large and convergence gap ratios, respectively.
Equivalent Structural Modeling of Wind Turbine Rotor Blade
Park, Young-Geun ; Hwang, Jai-Hyuk ; Kim, Seok-Woo ; Jang, Moon-Seok ; Bae, Jae-Sung ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 11~16
The wind turbine rotor blade is faced with various aeroelastic problem as rotor blades become bigger and lighter by the use the composite material. The aeroelastic analysis of a wind turbine rotor blade requires its aerodynamic model and structural model. For effective aeroelastic analysis, it is required the simple and effective structural model of the blade. In the present study, we introduce the effective equivalent structural modeling of the blade for aeroelastic analysis. The equivalent beam model of the composite blade based on its 3D finite element model is established. The free vibration analysis shows that the equivalent beam model of the blade is equivalent to its 3D finite element model.
Study of the Preliminary Design and Performance Prediction for the Hybrid Propulsion System
Yoon, Chang-Jin ; Song, Na-Young ; Yoo, Woo-Jun ; Kim, Jin-Kon ; Sung, Hong-Gye ; Moon, Hee-Jang ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 17~23
This paper describes the preliminary design procedure for the hybrid propulsion system. For a given mission defined by velocity increment, the design of a polyethylene/LOX hybrid rocket was implemented. In addition, Seven-cluster multi-port fuel-grain was considered. After determining the system size including the combustion chamber, the performance parameters such as specific impulse, thrust, characteristic velocity, and thrust coefficient can be predicted by using empirical regression rate correlation, though most of preliminary design code assume constant regression rate. The results of the performance prediction indicated that besides the widely used HTPB/LOX, polyethylene/LOX hybrid motor can be a viable alternative to the more widely used SRMs.
Influence of Boundary Layer Behavior on the Near-Wake of an NACA 0012 Airfoil
Yang, Jae-Hun ; Kim, Dong-Ha ; Chang, Jo-Won ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 24~30
An experimental study was carried out in order to investigate the influence of boundary layer behavior on the near-wake at low Reynolds numbers. An X-type hot-film probe(55R51) was used to measure the near-wake of an NACA 0012 airfoil at static angles of attack
, and the Reynolds numbers Re=2.3
, and 4.8
. The results of the study show that the characteristics of the boundary layer on the airfoil surface have a close relationship with the mean velocity and turbulence intensity profiles of a near-wake. Therefore, the development of the boundary layer, the position of the separation point, and the existence and non-existence of reattachment on the airfoil surface were represented by the differences in mean velocity and turbulence intensity profiles of the near-wake.
An Experiment Study on the Robust Input Shaping of Flexible Structures
Bae, Jae-Sung ; Hyun, Young-O ; Kwak, Dongi-Gi ; Park, Young-Guen ; Hwang, Jai-Hyuk ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 31~37
In this paper, an experimental study on the robust input shaping for control of the residual vibration of flexible structures has been investigated. Two approaches has been used for the robustness of input shaping: the first method is to increase the number of impulses, and the other includes an EI shaper using vector diagram. The input case designed by the application of the above methods has been applied to a control problem involving residual vibration of a rotating hub with two flexible appendages. It has been found by a series of experiments that the input shaper designed in this paper works well for the residual vibration control of the flexible structure.
Economies of Scale in Multiproduct Firms;Evidence from Air Transport Industry
Kim, Je-Chul ; Huh, Seok-Min ; Lee, Dong-Hui ; Lee, Young-Soo ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 38~47
This study analyzes the expense structure of the air transport industry, based on the cost and income data of 18 major airlines, estimates the economic effectiveness of scale and conducts comparative analysis. As for the method of analysis, Translog cost function and the Fourier flexible function were used. The result showed that big companies had the economy of scale based on the Translog cost function, while the Fourier flexible function led to a estimation that expanding the input is not recommended, for the expansion of scale entails the poor economy of scale. It can be presumed that the economy of scale was estimated according to the U shape of the Translog cost function in the given data. On the other hand, the Fourier flexible cost function approaches the unknown function, as it is a Fourier series, and correctly infers the economy of scale based on the analyzed data. As for the flag carrier's economy of scale, it was inferred that the economy of scale existed by any of two functions. Therefore, the conclusion was that further expanding the scale will not cause any problem.
A Case Study on Technology Transfer of Aircraft Industry by Strategic Alliance
Ann, Young-Su ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 48~59
This Study focused on the process of technology transfer for the aircraft development program by the strategic alliance. Especially, this study showed how the learning firms absorb new technology from the foreign leading company. This case study concludes that teachability, asset specificity, relation capital with partner, information sharing system in organization and knowledge base are key factors for absorbing the new technology from the technology leading partner.
A Study on Provisions of 'Aeronautical Study' caused by Obstacle Limitation
Han, K.K. ; Kim, D.H. ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 60~65
An aeronautical study is a study of an aeronautical problem to identify possible solutions and select a solution that is acceptable without degrading safety. ICAO and the member states have established the standards regarding the obstacle limitation and regulated the construction of the man-made structures in and beyond the standards. Any obstacles that extend above a standards should as far as practicable be removed except after aeronautical study it is determined that the object would not adversely affect the safety or significantly affect the regularity of operations of airplanes. However ICAO and most member states does not established provisions of the scope and implement procedures of aeronautical study. Recently, Civil Aviation Regulations in Korea specify the provisions relevant to aeronautical study. The Prime objectives of this comparative study are to improve the domestic provisions for aeronautical study caused by obstacle limitation through the investigate the international standards and regulations.
A study on the Economies of Launching Regular Air Service Between South Korea and North Korea;Based on the Analysis of Air Passenger's Preference of air services from Seoul to Beijing via Pyung Yang
Ryu, M.Y. ; Kim, J.C. ; Yoo, K.E. ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 66~73
This study focuses on the economies of launching regular air services between capital cities of South Korea and North Korea. The demand for traveling between these two cities is too small to justify scheduled air service. However, it may be possible to provide regular air service by utilizing via flight of incumbent Seoul-Beijing flights. There are numerous flight services between Seoul and Beijing and we may allow some of the Seoul-Beijing flights to stop by Pyung Yang for commercial traffic handling. This study tries to find the optimal discount rate which passengers traveling between Seoul and Beijing via Pyung Yang, the idea is reasonable considering the inconvenience of stopping at Pyung Yang. The Stated Preference Techniques are applied for the study. The required data were collected through interviews of passengers traveling from Seoul to Beijing. The major variables that are considered in flight choice are air fare, flying time, and flight frequency. The relative importance of these major variables is estimated by the logit models calibrated with stated preference data.
A Research on the effects of airlines' FFP to customer loyalty
Hong, Eun-Hwa ; Park, Sang-Bum ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 74~86
As competition among airliners is getting sharper, promotion mix has been more important for new customers as well as old customers. In this research, how the systems for giving benefits for frequent flying customers are organized and the effects of the systems are analyzed. also, the effects of providing information by internet and issuing bonus card are investigated. As a research method, we inquired into questionnaire, and multi-regression test and ANOVA analysis are conducted. The customers who fly more frequent and have more desire to utilize milage cooperation system among airliners show more loyalty to the systems. Also, cooperation system among different industries is turned out to be effective from the marketing point of view. Also, the result of the test of internet-based system showed effective.
A Study on Alarm call of Black-tailed Gulls(Larus crassirostris) for Bird Strike Program
Park, Shi-Ryong ; Chung, Hoon ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 87~93
The black-tailed gull chicks, Larus crassirostris, recognize various adult voice signal base on the simple patterns. We investigated behavior change in black-tailed gull chicks through physical manipulation of mew call. They were playback in four situations differing in physical character: 1) frequency manipulation only, 2) duration manipulation only, 3) call intensity(dB) manipulation only, and 4) call interval manipulation only. We observed occurrence of different response of the chicks, which were categorized into two behaviors(hidden and return behavior). The manipulated frequency, duration, and intensity were directly correlated. The chicks exposed to only manipulated call interval(0.5, 1sec) made significantly more hidden and return behavior. Adult black-tailed gull only increased flight time on manipulated call interval. The results suggest that black-tailed gulls use short call interval for alarm signal. The analysis of alarm signal provides an important on basic study of bird strike.
Numerical forecasting of sea fog at West sea in spring
Han, Kyoung-Keun ; Kim, Young-Chul ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 94~100
The purpose of this case study is to determine the possibility of Numerical Forecasting of sea fog at West Sea in spring time. For practical method of analyzing the data collected from 24th to 26th March 2003, Numerical Weather Prediction model MM5(Mesoscale Model Version 5) and synoptic field study using synoptic chart, upper level chart, and sea surface temperature were employed. The results of synoptic field analysis summarized that sea fog at West sea in spring is intensified by the inflow of the warm flow from west or southwest, low sea surface temperature to increase the temperature difference between air and sea surface, and inversion layer to disturb the disperse. It appears that the possibility of sea fog forecasting by MM5, in view of the result that the MM5 output is similar to the synoptic fields analysis.
An Exploratory Study on the Selection Criterion of an Airline Firm
Yoo, Yong-Jae ; Lee, Seung-Chang ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 101~109
This study investigates what criterion airline customers recognize important when evaluating airline firms. Specifically it is surveyed if different criterion are used by different groups of airline customers when choosing an airline firm. In addition customer group with high loyalty to 'K' airline, national carrier of Korea, is differently evaluate 'K' airline for the selection criterion over customer group without loyalty. Frequent flyer program is suggested most important by most of the customers being followed by flight schedule. Flight schedule, in-flight food and air fare of 'K' airline are differently evaluated according to level of royalty to the airline. However there appears no difference in the evaluation of seat and entertainment between two groups, customers with high loyalty and customers without loyalty.
An Empirical case Study on the Improvement of Surveillance Systems in performing Circling Approach at the airport
Yang, Han-Mo ; Shin, Hyon-Sam ;
Journal of the Korean Society for Aviation and Aeronautics, volume 14, issue 4, 2006, Pages 110~119
This research was conducted with a view to enhance the efficiency of the preventive tool which provide pilots and controllers with proper and timely safety alerts while conducting circling approach at the airport where surrounding terrains becomes threat to safe operation of flight around airport.