• 한국군사과학기술학회지
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• 제18권6호
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• pp.789-796
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• 2015

Fighter pilot's ability to maintain both mental and physical capabilities in highly stressful situations is important for aviation safety as well as mission performance because pilot may confront frequently unexpected physical and psychological stimulation. Cumulative psychological stress and physical fatigue can be causes of mood distortion, declined alertness, and can lead to reduction of combat capability. We have investigated bio-signals and performance tests to monitor stress and fatigue levels, and developed a system to evaluate aviation mission suitability before flight. This study elucidated that stress and fatigue level of pilot can be monitored by psychomotor cognitive test(PCT) and heart rate variability(HRV), and that the best of reference for aviation mission suitability was confidential interval obtained from cumulative data of individuals. The system to evaluate aviation mission suitability was constructed with measuring part with PCT and HRV and control part with DB and algorithm.

• 한국가구학회지
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• 제17권4호
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• pp.59-83
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• 2006

This article was written in order to understand rockers of today and to provide basic data of their designs and manufacture studying pattern changes in the West. This article contains, the characteristics of the style of the Adirondack rockers, the Mission style rockers in America and the European rockers. Adirondack rockers ($1850{\sim}1940$) were made in various styles out of the mingling of rustic sensibilities with the formalism of Victorian designs. They were Old Hickory chair Co. style, Westport style, bentwood rocker style of two shape and Mottville rocker style. Mission style denoted American furniture design style of the early 20th century especially the work of Gustav Stickley and Roycroft Community. Mission style rockers had a simple, rectilinear style with exposed construction techniques, unpretentious materials (usually oak, with covering of leather, canvas or plain cloth) and little or no decoration. European rockers ($1660{\sim}1918$) have come to mean rockers from the English regional chair, Thonet, J&J Kohn, Henry Van de Velde and Hoffmann. The modernism of modern furniture was affected by the characteristics of the Adirondack rockers, the Mission style rockers and European rockers.

• 항공우주기술
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• 제7권1호
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• pp.91-98
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• 2008

제 2의 우주경쟁 시대를 맞이하여 세계 각국은 달을 선점하기 위한 치열한 경쟁을 벌이고 있다. 달에 영구기지를 2020년까지 건설하겠다는 미국을 비롯하여 유럽, 일본, 중국은 달탐사선을 성공적으로 발사하였으며 인도는 발사를 준비 중이다. 이와 같은 국제적인 분위기 속에 우리나라도 2020년까지 달에 탐사선을 보낼 계획을 발표하였다. 본 연구에서는 가변저추력을 이용한 달탐사 위성 설계에 기본 자료로 사용될 수 있는 달탐사 임무궤도를 설계하였으며, 이를 바탕으로 SMART-1과 비슷한 제원을 갖는 가상의 달탐사 임무를 설정하여 비행궤적을 산출하였다.

• 한국정보통신학회논문지
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• 제16권8호
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• pp.1817-1823
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• 2012

네트�p 중심전(NCW) 및 정보화 시대에 발맞추어 군에서도 고성능 작전콘솔을 활용하여 다양하고 복잡한 메시지 교환 및 운용병간 음성통화를 통해 신속하게 상태 및 정보를 공유함으로써 임무수행의 효율을 극대화하는 추세로 발전하고 있다. 작전 또는 훈련종료 후 임무 분석 및 검토를 통해 추후 새로운 작전계획을 세울 목적으로 작전상황을 기록하는 장치가 개발되어 운용되고 있다. 기록장치의 기록방식은 전시영상을 직접 기록하는 방식과 연동되는 데이터를 기록하는 방식으로 나뉜다. 본 연구는 데이터 기반 기록방식의 재생준비시간 개선을 위한 새로운 기록 방식과 개선방안을 제안한다.

• Journal of Computing Science and Engineering
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• 제2권4호
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• pp.375-393
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• 2008

The dynamic cast operation allows flexibility in the design and use of data management facilities in object-oriented programs. Dynamic cast has an important role in the implementation of the Data Management Services (DMS) of the Mission Data System Project (MDS), the Jet Propulsion Laboratory's experimental work for providing a state-based and goal-oriented unified architecture for testing and development of mission software. DMS is responsible for the storage and transport of control and scientific data in a remote autonomous spacecraft. Like similar operators in other languages, the C++ dynamic cast operator does not provide the timing guarantees needed for hard real-time embedded systems. In a recent study, Gibbs and Stroustrup (G&S) devised a dynamic cast implementation strategy that guarantees fast constant-time performance. This paper presents the definition and application of a cosimulation framework to formally verify and evaluate the G&S fast dynamic casting scheme and its applicability in the Mission Data System DMS application. We describe the systematic process of model-based simulation and analysis that has led to performance improvement of the G&S algorithm's heuristics by about a factor of 2. In this work we introduce and apply a library for extracting semantic information from C++ source code that helps us deliver a practical and verifiable implementation of the fast dynamic casting algorithm.

• 항공우주시스템공학회지
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• 제9권2호
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• pp.57-62
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• 2015

The satellite orbit is continuously changing due to space environment. Especially for low earth orbit, atmospheric drag plays an important role in the orbit altitude decay. Recently, solar activities are expected to be high, and relevant events are occurring frequently. In this paper, analysis on the impact of geomagnetic storm on LEO satellite orbit is presented. For this, real flight data of KOMPSAT-2, KOMPSAT-3, and KOMPSAT-5 are analyzed by using the daily decay rate of mean altitude is calculated from the orbit determination. In addition, the relationship between the solar flux and geomagnetic index, which are the metrics for solar activities, is statistically analyzed with respect to the altitude decay. The accuracy of orbit prediction with both the fixed drag coefficient and estimated one is examined with the precise orbit data as a reference. The main results shows that the improved accuracy can be achieved in case of using estimated drag coefficient.

• Journal of Astronomy and Space Sciences
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• 제34권2호
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• pp.139-151
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• 2017

This paper presents an overview of deep space orbit determination software (DSODS), as well as validation and verification results on its event prediction capabilities. DSODS was developed in the MATLAB object-oriented programming environment to support the Korea Pathfinder Lunar Orbiter (KPLO) mission. DSODS has three major capabilities: celestial event prediction for spacecraft, orbit determination with deep space network (DSN) tracking data, and DSN tracking data simulation. To achieve its functionality requirements, DSODS consists of four modules: orbit propagation (OP), event prediction (EP), data simulation (DS), and orbit determination (OD) modules. This paper explains the highest-level data flows between modules in event prediction, orbit determination, and tracking data simulation processes. Furthermore, to address the event prediction capability of DSODS, this paper introduces OP and EP modules. The role of the OP module is to handle time and coordinate system conversions, to propagate spacecraft trajectories, and to handle the ephemerides of spacecraft and celestial bodies. Currently, the OP module utilizes the General Mission Analysis Tool (GMAT) as a third-party software component for high-fidelity deep space propagation, as well as time and coordinate system conversions. The role of the EP module is to predict celestial events, including eclipses, and ground station visibilities, and this paper presents the functionality requirements of the EP module. The validation and verification results show that, for most cases, event prediction errors were less than 10 millisec when compared with flight proven mission analysis tools such as GMAT and Systems Tool Kit (STK). Thus, we conclude that DSODS is capable of predicting events for the KPLO in real mission applications.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.588-590
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• 2003

For the normal operations, KOMPSAT-1 orbits are determined using GPS navigation solutions data such as position and velocity vectors. Currently, the accuracy of GPS navigation solution data is generally known as on the order of 10~30 m with the removal of S/A. In this paper, an estimate of the current orbit determination accuracy for the KOMPSAT-1 is given. For the evaluation of orbit determination accuracy, the orbit overlap comparison is used since no independent orbits of comparable accuracy are available for comparison. As a result, It is shown that the orbit accuracy is on the order of 5 m RMS with 4 hrs arc overlap for the 30 hr arc.

• 인터넷정보학회논문지
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• 제24권6호
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• pp.107-117
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• 2023

사이버 공간에서 이루어지는 전투 행위가 군의 주요 임무체계 및 무기체계에 어떠한 영향을 미치는지를 평가할 수 있어야 한다. 사이버공격에 의한 임무영향을 사이버 M&S로 분석하기 위해서는 대상이 되는 임무체계와 사이버전 요소를 모델로 구축하고, 시뮬레이션을 위한 시나리오를 저작하여야 한다. 사이버전에 의한 임무영향 분석 관련 연구는 미국을 중심으로 많은 연구가 수행되었으며, 기존의 연구에서는 물리전장과 사이버전장에 대해 별개로 시나리오를 저작하였다. 임무영향 분석의 정확도를 높이기 위해서는 물리전장 모델과 사이버전장 모델을 결합한 시뮬레이션 환경을 구축하고, 임무 시나리오와 사이버공격/방어 시나리오를 통합해서 저작할 수 있어야 한다. 또한 물리전장과 사이버전장은 업무영역이 상이함을 고려하여 시나리오를 효율적으로 저작할 수 있는 방법이 필요하다. 본 논문에서는 임무체계 정보를 이용하여 시나리오 저작에 필요한 자료를 사전에 작성하고, 선작업된 자료를 이용하여 통합시나리오를 저작하는 방법을 제안한다. 제안한 방법은 시나리오 저작도구의 설계에 반영하여 개발하고 있으며, 제안 방법을 입증하기 위해 대화력전 분야의 통합시나리오 저작을 수행하였다. 향후, 제안한 방법을 반영한 시나리오 저작도구를 활용하면 임무영향 분석을 위한 통합시나리오를 짧은 시간에 쉽게 저작할 수 있게 될 것이다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.501-504
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• 2005

In general, most incomplete communication link setup between satellite and ground station right after separation from launcher come from less accurate orbital vector ground station uses to track the satellite because only predicted orbital state vector is available during first few orbits. This paper describes the developed procedure for successful initial acquisition for KOMPSAT-2 using scanning functions ofK13 antenna system with predicted orbital information. Azimuth scan, raster scan, spiral scan functions were tested with KOMPSA Tl under intentionally degraded orbital information for antenna operation. Through tests, spiral scan function was decided to be best search scan among 3 scans. Developed procedure can assure the successful acquisition only if azimuth offset and time offset value are within +/-2deg and +/-30sec, respectively.