• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume I
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• pp.228-231
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• 2006

In this paper, requirements of Meteorological Administration about Meteorological Imager (MI) of Communications, Ocean and Meteorological Satellite (COMS) is analyzed for the design of COMS ground station and according to the analysis results, the distribution image size of each observation area suitable for satellite Field Of View (FOV) stated at the requirements of meteorological administration is determined and the precise satellite FOV and the size of distribution image is calculated on the basis of the image size of the determined observation area. The results in this paper were applied to the detailed design for COMS ground station and also are expected to be used for the future observation scheduling and the scheduling of distribution of user data.

• ETRI Journal
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• 제25권5호
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• pp.387-400
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• 2003

Since its launching on 21 December 1999, the Korea Multi-Purpose Satellite-I (KOMPSAT-I) has been successfully operated by the Mission Control Element (MCE), which was developed by the ETRI. Most of the major functions of the MCE have been successfully demonstrated and verified during the three years of the mission life of the satellite. This paper presents the operational performances of the various functions in MAPS. We show the performance and analysis of orbit determinations using ground-based tracking data and GPS navigation solutions. We present four instances of the orbit maneuvers that guided the spacecraft form injection orbit into the nominal on-orbit. We include the ground-based attitude determination using telemetry data and the attitude maneuvers for imaging mission. The event prediction, mission scheduling, and command planning functions in MAPS subsequently generate the spacecraft mission operations and command plan. The fuel accounting and the realtime ground track display also support the spacecraft mission operations.

• 항공우주기술
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• 제8권2호
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• pp.127-132
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• 2009

본 논문에서는 단일 임무운용 개념에서 벗어나 향후 다수의 위성들을 동시에 직접 제어 하거나, 임무가 상이하더라도 주요 핵심시스템을 근간으로 각 위성마다 소요되는 임무운용 시스템을 개발함에 있어 개발기간을 획기적으로 줄일 수 있는 차세대 통합형 임무운용시스템 개발을 위한 분석 및 설계결과를 기술하였다. 이를 위해 우주개발선진국들의 통합지향형 임무운용시스템 개발 추세 및 개발 동향을 살펴보고, 각 시스템들의 주요 기능을 수행하는 공통 핵심시스템의 구조도 분석하였으며 설계 결과를 제시하였다.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2004년도 봄 학술발표논문집 Vol.31 No.1 (A)
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• pp.181-183
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• 2004

Mission-Critical한 실시간 반응형 내장 시스템들의 설계과정에 있어 high-level abstraction과 formal(software 기반) modeling은 없어서는 안될 중요한 부분이다. 실시간 반응형 내장 system의 OS는 정형 명세 기법을 이용하여 시스템의 주요 component들을 설계하고 OS의 Formal model들을 모든 가능한 input들 아래 OS의 behavior를 엄격하게 검증함으로써 error가 없는 완벽한 OS를 개발할 수 있다. 본 논문에서는 uC/OS-11의 OS Scheduling 부분을 반응형 시스템 언어인 Esterel의 SyncCharts로 명세, 명세한 시스템의 요구조건을 정형기법을 이용친서 검증해보고자 한다.

• 한국국방경영분석학회지
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• 제15권1호
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• pp.28-43
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• 1989

Squadron crew scheduling problems can be defined as the assignment of crews to flights consistent with safety regulations and squadron policy. In this paper, the daily crew scheduling problems are formulated as zero-one interger programs known as generalized assignment problems. The objective function is to maximize the weighted mission interval to improve the crew performance. Flight schedules using the 0-1 integer model are compared with manual schedules. The results of the study show that the average crew performance is improved.

• ETRI Journal
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• 제30권1호
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• pp.1-12
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• 2008

In this paper, we propose an efficient single-resource task scheduling algorithm for the Communication, Ocean, and Meteorological Satellite. Among general satellite planning functions such as constraint check, priority check, and task scheduling, this paper focuses on the task scheduling algorithm, which resolves conflict among tasks which have an exclusion relation and the same priority. The goal of the proposed task scheduling algorithm is to maximize the number of tasks that can be scheduled. The rationale of the algorithm is that a discarded task can be scheduled instead of a previously selected one depending on the expected benefit acquired by doing so. The evaluation results show that the proposed algorithm enhances the number of tasks that can be scheduled considerably.

• 한국위성정보통신학회논문지
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• 제3권2호
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• pp.26-31
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• 2008

As a multi-mission GEO satellite, Communication, Ocean, and Meteorological Satellite (COMS) is scheduled to be launched in the year 2009. COMS has three different payloads: Ka-band communication payload, Geostationary Ocean Color Imager (GOCI) and Meteorological Imager (MI). Among the three payloads, MI and GOCI have several conflict relationships; one of them is that if MI mirror moves vertically larger than 4 Line Of Sight (LOS) angle while GOCI is imaging, image quality of GOCI becomes degraded. In this paper, MI scheduling algorithm to prevent GOCI's image quality degradation will be presented.

• Journal of Astronomy and Space Sciences
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• 제18권3호
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• pp.209-218
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• 2001

과학위성 1호의 주 과학임무중의 하나인 전천탐사를 통해 얻어지는 천구의 각 지역별 노출시간을 모의 계산하였다. 현재 계획된 위성운용 시나리오에 의하면 노출시간은 친구적도 지역에서 최소가 되고 극 지역으로 갈수록 증가한다. 한편, SAA (South Atlantic Anomaly)와 달에 의한 영향으로 천구 적도지역에서의 노출시간 추가 감소가 불가피하다. SAA에 의한 노출시간 감소는 SAA의 영향이 별로 없는 고층대기 관측과의 궤도교체 등 간단한 관측 스케줄링을 통해 SAA의 영향을 배제할 수 있다. 그러나 현재의 노출시간 분포는 성찬물질의 진화를 구체적으로 연구하기 위해서는 적절치 않다. 친구의 극 지역에 치중된 노출시간의 효율적 분배를 위해서는 능동적인 지역별 노출시간 분배가 필요하고, 따라서 현재보다 진보된 운용 시나리오 및 관측 스케줄링에 대한 추가 연구가 요구된다

• 산업경영시스템학회지
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• 제43권4호
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• pp.116-122
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• 2020

Human and material resource planning is one representative example of Operations Research. Resource planning is important not only in civilian settings but also in military ones. In the Air Force, flight scheduling is one of the primary issues that must be addressed by the personnel who are connected to flight missions. However, although the topic is of great importance, relatively few studies have attempted to resolve the problem on a scientific basis. Each flight squadron has its own scheduling officers who manually draw up the flight schedules each day. While mistakes may not occur while drafting schedules, officers may experience difficulties in systematically adjusting to them. To increase efficiency in this context, this study proposes a mathematical model based on a binary variable. This model automatically drafts flight schedules considering pilot's mission efficiency. Furthermore, it also recommends that schedules be drawn up monthly and updated weekly, rather than being drafted from scratch each day. This will enable easier control when taking the various relevant factors into account. The model incorporates several parameters, such as matching of the main pilots and co-pilots, turn around time, availability of pilots and aircraft, monthly requirements of each flight mission, and maximum/minimum number of sorties that would be flown per week. The optimal solution to this model demonstrated an average improvement of nearly 47% compared with other feasible solutions.

• 한국군사과학기술학회지
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• 제15권3호
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• pp.322-333
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• 2012

AESA radar is able to instantaneously and adaptively position and control the beam, and such adaptive beam pointing of AESA radar enables to remarkably improve the multi-mission capability. For this reason, Radar Resource Management(RRM) becomes new challenging issue. RRM is a technique efficiently allocating finite resources, such as energy and time to each task in an optimal and intelligent way. Especially radar beam scheduling is the most critical component for the success of RRM. In this paper, we proposed a rule-based scheduling algorithm and Simulated Annealing(SA) based scheduling algorithm, which are alternatively selected and applied to beam scheduler according radar load status in real-time. The performance of the proposed algorithm was evaluated on the multi-function radar scenario. As a result, we showed that our proposed algorithm can process a lot of beams at the right time with real time capability, compared with applying only rule-based scheduling algorithm. Additionally, we showed that the proposed algorithm can save scheduling time remarkably, compared with applying only SA-based scheduling algorithm.