• 대한교통학회지
• /
• 제13권3호
• /
• pp.53-65
• /
• 1995

Proposed are model and its solution algorithm for determining the minimum number of high speed exits and their locations. While the previous researches on exit location aimed to minimize the average runway occuancy time (ROT) of an aircraft mix, the proposed approach is to find the minimum number of exits required to meet maximum allowable ROT. The rationale behind the approach is that the capacity of a runway increases as the ROT decreases down to some value, but not any more even though the ROT keep decreasing below the value. Hence, a maximum allowable ROT might be set up without declining the capacity. The problem is transformed into a shortest path problem on a specially constructed network and Dijkstra's labeling algorithms is employed to solve the problem A hypothetical example is provided to illustrate how the algorithms solves the problem.

• 한국항공운항학회지
• /
• 제28권2호
• /
• pp.47-52
• /
• 2020

Air transport demand is on a sharp rise due to growth in the aviation market. To prepare for this rapidly growing demand for aviation, airport operators are interested in the processing airport capacity. Airport throughput is determined to be the smallest of the facility capacities that make up the airport, but it is customary to determine the cost and time consuming runway capacity as airport capacity. Previous studies have shown that while recent studies have been conducted on airport capacity, there is little research on the criteria for determining capacity. In this study, we would like to determine the extent to which airport capacity is affected by the airport's operating hours and the resulting delays.

• International Journal of Aeronautical and Space Sciences
• /
• 제2권1호
• /
• pp.28-43
• /
• 2001

Developed in these two series of paper is a complex dynamic model representing the motion of aircraft on the ground and a computer program for numerical simulation. The first part of paper presents the theoretical derivation of equations of motion of the landing gear system based on the physical principle. Developed model is 'structured' in the sense that the undercarriage system is regarded as an assembly of strut, tire, and wheel, where each component is modeled by a separate module. These modules are linked with two external modules-the aircraft and the runway characteristics-to carry out dynamic analysis and numerical simulation of the aircraft motion on the ground. Three sets of coordinate system associated with strut, wheel/tire and runway are defined, and external loads to each component and response characteristics are examined. Lagrangian formulation is used to derive the undercarriage equations of motion relative to the moving aircraft, and the resultant forces and moments from the undercarriage are transformed to aircraft body axes.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 1997년도 춘계학술대회논문집; 경주코오롱호텔; 22-23 May 1997
• /
• pp.60-68
• /
• 1997

The motion of an aircraft landing gear over rough runway at variable speed is nonstationary. In this paper a method for the computation of nonstationary response variance is presented which uses a state space form for the combination of landing gear and runway excitation. The dynamic characteristics of the landing gear under nonstationary random excitations has also been analyzed using the proposed method. The formulation is for linear systems of arbitrary order and allows any deterministic velocity history. It has been found by a series of simulation that correlation parameter, damping coefficients of landing gear and tire, and velocity profiles plays a prominent role on the dynamic characteristics.

• 한국항공운항학회지
• /
• 제17권3호
• /
• pp.61-69
• /
• 2009

This research examined the influence of status and regulatory focus on go-around decision making. The result showed that there was no difference between captains and first offers on the go-around decision making about various landing situations. But there was significant relationships between regulatory focus and go-around decision making. Prevention focus was positively related with uncertain situation, and runway situation. Promotion focus has positive relationship with deficiency situation but has negartive relationship with runway situation.

• 한국사회복지학
• /
• 제45권
• /
• pp.156-184
• /
• 2001

This study was designed to look at the relationships between parental child-rearing behavior and personality traits and run-away behavior of youths. For the purpose, this study compared 156 youth from the juvenile correctional systems, and 146 youths from high-schools. The additional focus was to find personality differences between runway youths and non-runway youths, and the effects of parental child-rearing behavior. The findings were as follows; First, high caring and low overprotection, among parental child-rearing behavior, was found to have effects upon adolescents with positive personality factors, whereas parental low caring and high overprotection effected upon negative personality factors among youths. Second, in relationship between runaway behavior and personality factors, it was found that youths with positive meaning in personality factors turned out to be less likely to run away from home, whereas those with negative meaning in 16PF were more likely to run away. Lastly, adolescents in high caring and low overprotection state with parents, proved to have high scores in personality factors, and low probability in runaway behavior.

• 한국항공운항학회지
• /
• 제31권4호
• /
• pp.7-18
• /
• 2023

The continuous increase in air traffic emphasizes the importance of capacity calculation. Research on the calculation method of Terminal Control Area (TMA) capacity has been treated as a partial aspect of the airspace sector capacity or has been limitedly studied. This study aims to propose a mathematical model for calculating TMA capacity, taking into account the Standard Terminal Arrival Route (STAR), separation standards, TMA entry speed, and runway threshold passing speed. The proposed model has the advantage of being able to calculate the instantaneous arrival capacity, which has not been noted in previous studies, along with the throughput. Additionally, it is meaningful as the model can easily calculate the arrival capacity of the TMA considering airport construction, runway expansion, or new procedures.

• 대한토목학회논문집
• /
• 제40권5호
• /
• pp.521-526
• /
• 2020

활주로 및 유도로 등의 비행장 포장체는 고정익 항공기의 원활한 이착륙을 위해 반드시 필요한 시설물로 군에서도 전·평시 항공작전의 수행을 위해서 가장 중요한 시설물이라 할 수 있다. 따라서 전시에 이러한 시설의 피해를 줄이고 최단시간에 복구하는 것이 필요하다. 최근의 공격양상은 대형 폭발구를 조성하기 위한 고폭탄을 사용하기 보다는 적의 비행장을 효과적으로 공격하고자 정확도와 관계없는 다탄두 무기체계를 사용하는 것으로 변화되고 있다. 따라서 본 연구에서는 다탄두 무기체계에 적용된 탄두의 제원과 구성을 통해 현재 군에 설치된 활주로 및 유도로 등에 접촉하여 폭발이 이루어졌을 때 포장체의 방호성능 및 피해양상을 확인해 보았으며, 다탄두 무기체계는 광범위한 피해를 줄 수 있지만 각각의 탄두의 파괴력은 그리 크지 않으므로 이러한 공격 대한 최소한의 방호를 위해서 필요한 비행장 포장체의 설계 방안을 제시하고자 한다.

• 한국도로학회논문집
• /
• 제3권3호
• /
• pp.111-118
• /
• 2001

초대형 점보 항공기의 출현으로 인하여 활주로 표면의 마찰저항 성능이 중요하게 되었다. 우천시나 겨울철과 같은 특정한 기후에서 활주로 표면은 수막현상과 마찰력의 손실이 발생하여 항공기의 브레이크 기능이 저하되어 제동력을 잃게 된다. 이러한 문제를 해결하기 위해 많은 연구가 미국항공우주국, 미공군, 미연방항공청 등에 의해 수행되었다. 그 결과 다양한 종류의 마찰저항이 끈 포장표면 처리 방법이 개발되었다. 이러한 설계방법 가운데 대표적인 방법이 그루빙이다. 포장 그루빙 공법은 활주로 표면에 마찰저항을 증가시키고 수막현상을 감소시켜주는 장점이 있는 것으로 보고되고 있다. 본 연구는 인천국제공항의 A-2구간에 수행된 건식 그루빙의 시공결과를 평가한 것이다. 그루빙 시공중에 온도 게이지를 사용하여 포장체+의 온도를 측정하고 건식 그루빙중에 온도변화를 측정하였으며 컷트날의 마찰로 발생하는 그루빙 시공이 완료된 활주로에 물을 살수하고 뮤 미터와 수심측정기를 사용하여 마찰계수와 수심을 계측하였다. 시험결과, 그루빙은 포장체에 손상을 주지 않았으며 활주로 표면은 마찰저항이 증가하고 수막현상을 감소하는 효과가 현저하게 나타나서 건식 그루빙의 효과는 매우 큰 것으로 평가되었다.

• 아시안잔디학회지
• /
• 제16권2호
• /
• pp.75-83
• /
• 2002

The back-filled soil of the New Incheon International Airport construction site was reclaimed with sea sand in near the Young-Jong island. The primary study was carried out from August 1993 to June 1997 to study soil amendment and to select salt resistance turfgrass species. This study dealt with low maintenance area that included most part of open space of airport site. The second experiment, from October 1996 to August 1998, focused on soil amendment and selection of turfgrass species for alongside runway where turf area was maintained. Through two previous studies, propagation methods with zoysiagrass were tested for alongside runway and surrounding areas at 1998. The study of construction methods with zoysiagrass, vegetative propagation showed better results on visual quality and cover rating compare with seeding propagation. However, significant different between vegetative and seeding propagation was not showed on visual quality and drought tolerance after one year of plot establishment. The cover rating by seeding construction methods reached in excess of 70% of limitation suggested by the Incheon International Airport Cooperation. Zoysia net and sprigging net methods were the most suitable where there requires rapid and high rate of ground cover. Seeding propagation should be acceptable to obtain a resonable cover rating where there allows relatively longer period of completion. Therefore, it should be possible to attain a proper rating of ground cover on the site of open space, alongside runway or areas similar to the New Incheon International Airport which is being built on dredged seashore sand. However, the methods of soil amendment, selecting salt tolerance species, and proper construction procedure should be considered at the a time.