• 제목/요약/키워드: Flight Segments

검색결과 16건 처리시간 0.027초

인천/나리타 공항의 여객기 출.도착 데이터를 이용한 항공노선 분석 연구 (Analysis of Airline Network using Incheon and Narita Passenger Flight Origin-Destination Data)

  • 백의영;조재희
    • Journal of Information Technology Applications and Management
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    • 제20권1호
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    • pp.87-106
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    • 2013
  • This study is to explore the airline network patterns of Incheon and Narita International Airports using passenger flight departure and arrival data of the two airports. The so-called Origin-Destination data is collected from the airports' websites and some of the important data items are flight number, city of origin, destination city, departure/arrival time, number of flights, and delay time. A snowflake schema dimensional model is proposed and implemented. Tableau Public, a well-known visual analytic tool, is used to connect the dimensional model and played an important role in navigating the data space to find interesting and visual patterns among corresponding airports and airlines. For the efficiency of analyzing this spacious data mart, data visualization method was used. Four types of visualization method proposed by Yau was used; visualizing patterns over time, visualizing proportions, visualizing relationships, and visualizing spatial relationships. The strength of connectivity of each flight segments is calculated to evaluate the degree of globalization of Seoul and Tokyo. We anticipate that various patterns and new findings produced by the data mart would provide airline managers, airport authorities, and policy makers in the field of travel and transportation with insightful information.

BADA를 활용한 4-D 경로 모델링법 개발 (Development of 4-D Trajectory Modeling using BADA)

  • 오은미;은연주;전대근
    • 한국항공운항학회지
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    • 제20권2호
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    • pp.1-6
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    • 2012
  • Four dimensional(4-D) trajectory modeling is conducted based on flight plan. The flight plan is divided into several segments which represent certain operating flight modes. Thrust, drag and fuel consumption rate of an aircraft are calculated using BADA provided by Eurocontrol. The trajectory is modeled with the rate of climb/descent calculated with Total-Energy Equation. The simulation results with a typical aircraft and its flight plan indicate that the trajectory modeled corresponds well with the suggested flight plan. The performance profiles including total endurance time and time history for speed, thrust, drag and fuel consumption were also appropriately generated.

KSR-III 로켓의 도로운송 및 핸들링에 의한 진동하중 (Vibration Loads on KSR-III during Ground Transportation and Handling)

  • 전영두;조병규;박동수;황승현;김준
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 추계학술대회논문집
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    • pp.250-254
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    • 2002
  • It is conducted to analyze vibration loads on KSR-III(KSR: Korea Sounding Rocket) and its major segments during their ground transportation and various handling process. These loads may be different from the real flight environment. Inadequate assessment of these loads can cause not only local damages on the rocket system but also the critical problem like flight mission failure. Therefore, transportation and handling loads must be considered during design and attenuated to ensure that the rocket structural damage does not occur. This work is concerned with the generation of criteria and prediction of transportation and handling loads for KSR-III. The results show that the shipping container is well designed to satisfy the design requirements. The maximum vibration level recorded during whole transportation and handling for KSR-III is less than 2g, the criteria of KSR-III movement condition.

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KSR-III 로켓의 도로운송 및 핸들링에 의한 진동하중 (Vibration Loads on KSR-III during Ground Transportation and Handling)

  • Chun, Young-Doo;Cho, Byoung-Gyu
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 추계학술대회논문초록집
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    • pp.330.2-330
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    • 2002
  • It is conducted to analyze vibration loads on KSR-III and its major segments during their ground transportation and various handling process. These loads may be different from the real flight environment. Inadequate assessment of these loads can cause not only local damages on the rocket system but also the critical problem like flight mission failure. Therefore, transportation and handling loads must be considered during design and attenuated to ensure that the rocket structural damage does not occur. (omitted)

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선소의 추출과 그룹화를 이용한 원격탐사영상에서 건물 지붕의 복원 (Building Roof Reconstruction in Remote Sensing Image using Line Segment Extraction and Grouping)

  • 예철수;전승헌;이호영;이쾌희
    • 대한원격탐사학회지
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    • 제19권2호
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    • pp.159-169
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    • 2003
  • 본 논문에서는 고해상도의 항공 영상으로부터 건물의 3차원 정보를 자동으로 생성하는 방법을 제안하였다. 먼저 에지 보존 필터를 사용하여 영상에 포함된 잡음을 제거한 후에 watershed 기법을 이용하여 에지의 위치를 보존하고 영상 분할을 수행한다. 분할된 영역의 경계선에 위치한 화소의 곡률을 계산하여 control point를 검출하고 control point 사이의 선소를 추출한다. 추출된 선소들의 방향과 길이를 고려하여 선소의 연결을 수행하고 최종적으로 화소의 그레디언트 크기를 이용하여 선소의 위치를 조정한다. 공면의 그룹화와 다각형 조각을 형성하는 과정은 각 영역에 대해 공선 기하학과 비행 정보를 이용하여 정합된 3차원 선소들을 선택하여 이루어진다. 항공 영상에 제안한 방법을 적용하여 건물 지붕을 정확하게 검출할 수 있음을 보였다.

eVTOL PAV 유형별 항속거리 및 항속시간 분석 (Flight Range and Time Analysis for Classification of eVTOL PAV)

  • 이봉술;윤주열;황호연
    • 한국항행학회논문지
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    • 제24권2호
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    • pp.73-84
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    • 2020
  • 자동차 대수의 증가로 인한 지상 교통의 혼잡을 극복하기 위해 많은 회사들이 새로운 방식의 운송 수단인 미래형 개인항공기(PAV)를 제안하였다. 미래형 개인항공기 중에서도 전기를 동력으로 사용하고 수직 이착륙이 가능한 전기수직이착륙(eVTOL)항공기가 주목을 받고 있으며 그러한 항공기들의 형상은 멀티콥터형에서 틸트 덕티드팬까지 다양하다. 본 연구에서는 eVTOL 유형별 장단점 등 특성을 분석하였다. 틸트날개형, 복합형, 멀티콥터형의 대표적인 eVTOL PAV인 바하나, 오로라, 볼로콥터에 대해 구성성분 합계 방식을 사용하여 유해항력을 구하였으며, 항공기 설계 및 공력 해석 프로그램인 OpenVSP와 XFLR5 프로그램을 사용하여 표면적과 유도항력을 구하였다. eVTOL PAV에 사용되는 배터리는 테슬라 2170 배터리로 가정하고 항속거리를 계산하였다. 또한 각 eVTOL에 대해 이착륙 및 순항을 포함한 임무형상별로 에너지소모 및 최대 비행시간을 계산하여 비교하였다.

수치지형정보를 애용한 지형의 3차원 표현 software 개발 (Development of the Three Dimensional Landform Display Software Using the Digital Terrain Model)

  • 이규석
    • 한국조경학회지
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    • 제17권3호
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    • pp.1-8
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    • 1990
  • The digital terrain model (DTM) or digital elevation model (DEM) is commonly used in representing the continuous variation of relief over space. One of the most frequent applications is to display the three dimensional view of the landform concerned. In this paper, the altitude matrices-regular grid cell format of the elevation in Mt. Kyeryong National Park were used in developing the three dimensional view software for the first time in Korea. It required the removal of hidden lines or surfaces. To do this, it was necessary to identify those surfaces and line segments that are visible and those that are invisible. Then, only the visible portions of the landform were displayed. The assumption that line segments are used to approximate contour surfaces by polygons was used in developing the three dimensional orthographic view. In order to remove hidden lines, the visibility test and masking algorithms were used. The software was developed in the engineering workstation, SUN 3/280 at the Institute of Space Science and Astronomy using 'C' in UNIX operating system. The software developed in this paper can be used in various fields. Some of them are as follows : (1) Landscape design and planning for identifying viewshed area(line of sight maps) (2) For planning the route selection and the facility location (3) Flight simulation for pilot training (4) Other landscape planning or civil engineering purposes

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Low thrust inclined circular trajectories for airplanes

  • Labonte, Gilles
    • Advances in aircraft and spacecraft science
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    • 제4권3호
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    • pp.237-267
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    • 2017
  • Automatic trajectory re-planning is an integral part of unmanned aerial vehicle mission planning. In order to be able to perform this task, it is necessary to dispose of formulas or tables to assess the flyability of various typical flight segments. Notwithstanding their importance, there exist such data only for some particularly simple segments such as rectilinear and circular sub-trajectories. This article presents an analysis of a new, very efficient, way for an airplane to fly on an inclined circular trajectory. When it flies this way, the only thrust required is that which cancels the drag. It is shown that, then, much more inclined trajectories are possible than when they fly at constant speed. The corresponding equations of motion are solved exactly for the position, the speed, the load factor, the bank angle, the lift coefficient and the thrust and power required for the motion. The results obtained apply to both types of airplanes: those with internal combustion engines and propellers, and those with jet engines. Conditions on the trajectory parameters are derived, which guarantee its flyability according to the dynamical properties of a given airplane. An analytical procedure is described that ensures that all these conditions are satisfied, and which can serve for producing tables from which the trajectory flyability can be read. Sample calculations are shown for the Cessna 182, a Silver Fox like unmanned aerial vehicle, and an F-16 jet airplane.

조종사와 항공교통관제사간의 상호의존성, 신뢰, 협력, 관계의 효과성에 관한 연구 (The Role of Interdependence, Trust, Cooperation, and Relationship Effectiveness on Pilot and Air Traffic Controller Relationships)

  • 최연철;김칠영;강인원
    • 한국항공운항학회지
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    • 제9권1호
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    • pp.5-13
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    • 2001
  • There are many studies which reveal most of the accidents are related to pilot errors. Looking at each phase of flight, the accidents which occurred at the segments of take-off and landing consist of 70%, cause these phases need precise cooperations between pilots and ATC specialists to make sure every instructions understood and instruments to be normal. Therefore, the accidents of these phases leave great regrets and the price was enormous to people and equipments. Until now, most of the studies investigate the accident itself and very few show the relationships between pilots and air traffic controllers. This study analyzes the impacts of inter-dependence to mutual trust, cooperations and relationship efficiency between them who play important parts in flight. Based upon the findings, the inter-dependence has an effect on mutual trust and the latter influences to cooperations. Also, mutual trust and cooperations have a leading role in the relationship efficiency. It implies that mutual trust, cooperations, and the degree of inter-dependence are important factors to improve the relationships between them.

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Image segmentation and line segment extraction for 3-d building reconstruction

  • Ye, Chul-Soo;Kim, Kyoung-Ok;Lee, Jong-Hun;Lee, Kwae-Hi
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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    • pp.59-64
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    • 2002
  • This paper presents a method for line segment extraction for 3-d building reconstruction. Building roofs are described as a set of planar polygonal patches, each of which is extracted by watershed-based image segmentation, line segment matching and coplanar grouping. Coplanar grouping and polygonal patch formation are performed per region by selecting 3-d line segments that are matched using epipolar geometry and flight information. The algorithm has been applied to high resolution aerial images and the results show accurate 3-d building reconstruction.

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