• Bulletin of the Korean Space Science Society
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• 2009.10a
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• pp.46.2-46.2
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• 2009

탑재소프트웨어는 위성의 자세, 전력, 열 제어를 담당하는 소프트웨어로서 위성의 탑재컴퓨터 상에서 실행된다. 탑재소프트웨어는 추력기, 배터리, 온도조절장치와 같은 위성의 하드웨어 장치를 자치적으로 관리한다. 지상에서 위성을 운영할 수 있도록 탑재소프트웨어는 지상으로부터 명령을 받아서 처리하고, 위성의 텔레메트리 데이터를 지상으로 전송한다. 위성의 탑재소프트웨어를 프로그래밍하기 위하여 C 언어와 ADA 언어가 주로 사용된다. 이 논문에서는 소프트웨어 디자인과 하위레벨 프로그래밍 관점에서 C 언어와 ADA 언어를 비교 분석한다. 프로그래밍언어는 소프트웨어 디자인과 불가분의 관계에 있다. 이 논문은 프로그래밍언어와 함께 다목적실용위성과 통신해양기상위성의 소프트웨어 디자인을 소개한다. 다목적실용위성의 탑재소프트웨어는 절차 지향언어인 C로 작성되었으며, 함수 호출을 기반으로 설계되었다. 통신해양기상위성의 경우, 객체지향언어인 ADA로 작성되었으며, HOOD(Hierarchical Object-Oriented Design) 기법에 따라 모델링되었다. 탑재소프트웨어 프로그래밍언어는 위성의 탑재 하드웨어와 직접적으로 상호작용하도록 요구된다. 이 논문은 C와 ADA 언어가 메모리주소 및 로우 스토리지를 다루는 방법을 보여준다.

• Journal of Digital Contents Society
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• v.19 no.7
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• pp.1289-1296
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• 2018

The e-Navigation promoted by the International Maritime Organization is a technology that provides marine-related information necessary for ship and shore side by electronic means for marine safety, security and protecting marine environment. The IHO S-100 standard is a geospatial standard that can express various hydrographic information. Various specifications including S-101 for electronic charts are being developed. In this paper, to help developers who are interested in implementing the technology of S-100, we not only analyze the process to portray the S-100 based data but also implement a case study on S-129 under keel clearance management. The portrayal process consists of data encoding and portrayal engine. Data encoding includes generation of application schema and data set. Portrayal engine is performed by the reform of the generated data set, the XSLT processing, and then the generation of drawing instructions.

• Journal of Digital Contents Society
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• v.18 no.4
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• pp.739-745
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• 2017

This paper presents and discusses an implementation of the GPU shifted sorting method to find approximate k nearest neighbors which executes within "warp", the minimum execution unit in GPU parallel architecture. Also, this paper presents the comparison results with other two common nearest neighbor searching methods, GPU-based kd-tree and ANN (Approximate Nearest Neighbor) library. The proposed implementation focuses on the cases when k is small, i.e. 2, 4, 8, and 16, which are handled efficiently within warp to consider it is very common for applications to handle small k's. Also, this paper discusses optimization ways to implementation by improving memory management in a loop for the CUB open library and adopting CUDA commands which are supported by GPU hardware. The proposed implementation shows more than 16-fold speed-up against GPU-based other methods in the tests, implying that the improvement would become higher for more larger input data.

• Journal of Digital Contents Society
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• v.19 no.8
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• pp.1593-1601
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• 2018

The International Hydrographic Organization has developed the S-100 standard as a geospatial standard to express various types of hydrographic information. Product specification describes information of data on ENC such as definition, structure, data model, etc. S-129 PS is for under keel clearance management information. In this paper, to help developers to implement S-129 PS using the technology of S-100, we analyze the process to portray the S-100 based data and then implement a case study. This paper introduces the XSLT processing of portrayal engine to reform the generated data set, and the generation of drawing instructions to display the data set on the electronic chart. A case study is experimented to display the portrayal output of under keel clearance management on an electronic chart.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.627-629
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• 2003

직접부하제어사업은 전력산업구조개편에 따라 발생할 수 있는 공급자원의 불확실성에 대비한 강력한 수요관리프로그램 중의 하나로 정부에서 중점 추진중인 사업이다. 이미 선진국에서도 다양한 메커니즘에 의해 Demand Response Program과 같은 부하관리프로그램을 운영하여 전력수급 및 전력요금 안정화를 꾀하고 있다. 우리나라의 경우 2001년도부터 동사업이 시행되고 있으며, 이에 주관기관으로서 에너지관리공단에서 추진하고 있는 직접부하제어를 위한 시스템 구성 및 운용방안에 대해 언급하고자 한다. 직접부하제어시스템은 크게 2단계로 구분되어지며, 상위시스템은 에너지관리공단에 설치 운영 중인 "전력부하관리센터(LMC)"와 민간 참여에 의해 운영 예정에 있는 "부하관리사업자시스템 (LSES)"으로 구성되며, 하위시스템은 "수용가용 직접부하제어시스템"으로 구성된다. 이에 본 연구에서는 직접부하제어시스템의 제어명령 체계 및 계량/정산을 위한 데이터처리방식 둥을 제시하여 본 시스템의 유용성 및 발전방향을 도출하고자 한다.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.158.1-158.1
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• 2012

위성비행소프트웨어는 위성의 하드웨어와 임무 탑재체 및 서브시스템이 통합되어 궤도상에서 위성임무를 수행할 수 있도록 원격명령 및 측정데이터의 처리, 자세 및 궤도제어, 열제어, 전력제어 등의 기능을 수행한다. 위성비행소프트웨어의 개발과 같이 규모가 큰 소프트웨어는 여러 개발자가 참여해야 하고 각각의 개발자들이 작성 코드를 통합하여 빌드하고 문제 발생 시 대처하기 위하여 세부적인 설계 및 개발내용을 단계별로 문서화하는 작업이 수반되어야 한다. 기존의 위성비행소프트웨어 개발과정에서는 이러한 문서들 중 전체 위성비행소프트웨어의 단위 코드별 입출력, 수행기능 등의 상세 설계 내용을 기록하는 SDD(Software Design Description)는 개발자가 작성한 코드를 기반으로 수작업을 통하여 작성되었다. 이러한 작성방식은 작성자의 입력오류가 발생할 수도 있으며 소프트웨어 개발과 별도로 수작업이 요구되어 문서작성에 소요되는 시간적 손해가 발생하게 된다. 유럽에서는 이러한 문제점을 보완하기 위하여 C, C++, C#, JAVA, VHDL 등 다양한 언어를 사용하는 소프트웨어 개발에 적용 가능한 자동적 문서작성 도구인 Doxygen이 널리 활용되고 있다. Doxygen은 PDF, HTML, Latex, RTF 등 다양한 출력 포맷도 지원한다. 본 논문에서는 Doxygen을 활용하여 위성비행소프트웨어 개발문서의 작성 시 소요시간을 단축하고 소스코드로부터 해당 설계 내용을 추출하여 자동적으로 문서를 작성할 수 있는 방안에 대하여 소개한다.

• Journal of the Korea Society of Computer and Information
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• v.20 no.4
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• pp.33-40
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• 2015

This paper presents the design and implementation of the educational remote controlled robot system including remote sensing in the embedded environment. The design of sensing information processing, software design and template design mechanism for the programming practice are introduced. LPC1769 using Cortex-M3 core as CPU, LPCXPRESSO as debugging environment, C language as firmware development language and FreeRTOS as OS are used in development environment. The control command is received via RF communication by the server and the robot system which is operated by driving the various sensors. The educational procedure is from robot demo operation program as hands-on practice and then compiling, loading of the basic robot operation program, already supplied. Thereafter the verification is checked by using the basic robot operation to allow demo operation such as hands-on-training procedure. The original protocol is designed via RF communication between server and robot system, and the satisfied performance result is presented by analyzing the robot sensing data processing.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.15 no.11
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• pp.2433-2438
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• 2011

Bus system consists of several masters, slaves, arbiter and decoder in a bus. Master means the processor that performs data command like CPU, DMA, DSP and slave means the memory that responds the data command like SRAM, SDRAM and register. Furthermore, as multiple masters can't use a bus concurrently, arbiter plays an role in bus arbitration. In compliance with the selection of arbitration method, bus system performance can be changed definitely. Fixed priority and round-robin are used in general arbitration method and TDMA and Lottery bus methods are proposed currently as the improved arbitration schemes. In this study, we proposed the score arbitration method and synthesized it using Hynix 0.18um technology, after design of RTL. Also we analyze the performance compared with general arbitration methods through simulation.

• KIPS Transactions on Software and Data Engineering
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• v.7 no.3
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• pp.99-106
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• 2018

In the process of acquiring information through the cyber ISR (Intelligence Surveillance Reconnaissance) and research into the agent to help decision-making, periodic communication between the C&C (Command and Control) server and the agent may not be possible. In this case, we have studied how to effectively surveillance and reconnaissance. Due to the network configuration, agents planted on infiltrated computers can not communicate seamlessly with C&C servers. In this case, the agent continues to collect data continuously, and in order to analyze the collected data within a short time in When communication is possible with the C&C server, it can utilize limited resources and time to continue its mission without being discovered. This research shows the superiority of incremental learning method over batch method through experiments. At an experiment with the restricted memory of 500 mega bytes, incremental learning method shows 10 times decrease in learning time. But at an experiment with the reuse of incorrectly classified data, the required time for relearn takes twice more.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.31 no.6
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• pp.96-101
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• 2003

Korea Sounding Rocket(KSR)-III onboard telemetry system has acquired various data from subsystems and sensors in the rocket, and radiated PCM/FM data using two S-band antennas during the flight. Simultaneously， it is necessary that the ground receiving systems track the rocket, and receive and decode telemetry data. Also post processed telemetry data are needed to be broadcasted on ethernet network in real time. Range safety display system displays flight trajectory using telemetry data in mission control center, and so flight manager makes a decision for flight termination from the trajectory This paper describes operating technique about telemetry reception, the development for the realtime data processing system, and the results for telemetering reception on fight test. We telemetered, processed, and broadcasted numerous telemetry data during the flight test successfully.