• Title/Summary/Keyword: Operation Scenario

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KSR-III 비행시험 발사 시나리오 개발

  • Shin, Myoung-Ho;Seo, Jin-Ho;Kim, Kwang-Soo;Hong, Il-Hi
    • Aerospace Engineering and Technology
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    • v.2 no.1
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    • pp.140-152
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    • 2003
  • Scenario is a guiding principle of launch operation and control for rocket and ground support system. Therefore, developing a scenario is the first step to prepare for rocket launch, which is a critical task for success of KSR-III flight test. The launch scenario for KSR-III flight test is a procedural sequence of command and control signals to be given to rocket and ground support systems. In this paper, the UML object modeling method is applied to development of a launch scenario. First, the subsystems of the launch system are modeled by objects, and then the interfaces between each two subsystems are modeled by association links. The finally obtained object diagram of KSR-III launch system is used to analyzing flow of data and commands and control signals, and interactions. The scenario includes the sequences of pre-launch/launch operations and emergency operations.

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Study on the Management of Doam Dam Operation by the Analysis of Suspended Solids Behavior in the lake (호내 부유물질 거동 분석을 통한 도암댐 운영 방안에 관한 연구)

  • Yeom, Bo-Min;Lee, Hye Won;Moon, Hee-Il;Yun, Dong-Gu;Choi, Jung Hyun
    • Journal of Korean Society on Water Environment
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    • v.35 no.6
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    • pp.470-480
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    • 2019
  • The Doam lake watershed was designated as a non-point pollution management area in 2007 to improve water quality based on watershed management implementation. There have been studies of non-point source reduction with respect to the watershed management impacting the pollutant transport of the reservoir. However, a little attention has been focused on the impact of water quality improvement by the management of the dam operation or the guidelines on the dam operation. In this study, the impact of in-lake management practices combined with watershed management is analyzed, and the appropriate guidelines on the operation of the dam are suggested. The integrated modeling system by coupling with the watershed model (HSPF) and reservoir water quality model (CE-QUAL-W2) was applied for analyzing the impact of water quality management practices. A scenario implemented with sedimentation basin and suspended matter barrier showed decrease in SS concentration up to 4.6%. The SS concentration increased in the scenarios adjusting withdrawal location from EL.673 m to the upper direction(EL.683 m and EL.688 m). The water quality was comparably high when the scenario implemented all in-lake practices with water intake at EL.673 m. However, there was improvement in water quality when the height of the water intake was moved to EL.688 m during the summer by preventing sediments inflow after the rainfall. Therefore, to manage water quality of the Doam lake, it is essential to control the water quality by modulating the height of water intake through consistent turbidity monitoring during rainfall.

Operability Assessment of a Naval Vessel in Seaways Based on Seakeeping Performance and Operation Scenario (내항 성능과 운용 시나리오에 기반한 함정의 실해역 운항성 평가)

  • Choi, Sungeun;Kim, Kiwon;Kim, Hoyong;Seo, Jeonghwa;Yang, Kyung-Kyu;Rhee, Shin Hyung;Kim, Beomjin
    • Journal of the Society of Naval Architects of Korea
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    • v.59 no.5
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    • pp.252-261
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    • 2022
  • The present study concerns assessing the operability of a surface combatant, based on the Percent-Time-Operable (PTO). For validation of the seakeeping analysis in the regular waves, the model test is first conducted in a towing tank. The seakeeping analysis results in the regular waves are expanded to the irregular waves, considering the wave spectra around the Korean peninsula and in North Pacific. The seakeeping criteria of the surface combatant in transit, combat, replenishment operation, and survival condition are defined by the literature review. An annual operation scenario of the surface combatant in two operation areas, i.e., advance speed and wave direction, are combined with the seakeeping analysis results to assess PTO. The main constraints of operability of the surface combatant are identified as the pitch angle and vertical velocity at the helicopter deck.

A Study of Interactive Training Methods for the Safe Operation of City Gas Governor (도시가스 정압기 안전운영을 위한 인터랙티브 훈련 방안 연구)

  • Kim, Hyoung Jean;Park, Chan Cook;Lee, Jae Yong;Lee, Chun Sik;Yu, Chul Hee
    • Journal of the Korean Institute of Gas
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    • v.21 no.1
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    • pp.34-42
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    • 2017
  • We developed the safety training methods which improve the current methods by overcoming the single scenario-based one-way communication between trainee and training system. We improved the design and implementation of the safety training scenarios, which is one of the most important components of the plant safety training system for safe operation of the city gas governor. The diversity and training effects of the training scenarios can be improved by interactive training between the plant safety training system and operators. The interactive training methods were developed based on Finite State Machine model which is applicable to and based on plant safety training platform. We could see the possibility of applying this method of safety training scenario system to other domain of plant safety training system.

Preliminary Analysis on Characteristics of Attitude Control based on Operation Scenario of Small SAR Satellite Mission, S-STEP (초소형 SAR 위성 S-STEP의 임무 시나리오에 따른 자세 제어 성능 예비 분석)

  • Lee, Eunji;Park, Jinhan;Song, Sung-Chan;Oh, Hyun-Ung
    • Journal of Aerospace System Engineering
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    • v.16 no.5
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    • pp.49-56
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    • 2022
  • S-STEP is a small SAR satellite mission that monitors time-limited emergency targets and military anomalies in areas of interest, achieving the average revisit in less than 30 minutes by deploying a constellation of 32 satellites in low orbit at an altitude of 510 km. The mission operation mode of S-STEP is divided into normal mode, observation mode, communication mode, and orbit maintenance mode. Further,, the attitude control mode is subdivides into initial detumbling, sun pointing, target pointing, ground station pointing, and thrust direction maintenance. Based on the preliminary mission operational scenario and the satellite's characteristics, this study analyzed the attitude control performance during initial detumbling and observation modes. It verifies that each mode's attitude control accuracy requirements within the time allotted by the scenario of the S-STEP achieved.

Calculation of Joule Heat and Temperature Distribution Generated on the Superconduction Magnet Structure for the KSTAR Operation Scenarios (KSTAR 운전시나리오에 대해 초전도자석 구조물에 발생되는 줄열 및 온도분포 계산)

  • Seungyon Cho;Jeong Woo Sa;Chang Ho Choi;KSTAR Team
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2002.02a
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    • pp.56-59
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    • 2002
  • Since the KSTAR magnet structure should be maintained at cryogenic temperature of about 4.5 K, even a small amount of heat might be a major cause of the temperature rising of the superconducting magnet structure. The Joule heating by eddy current induced on the magnet structure during the KSTAR operation was found to be a critical parameter for designing the cooling scheme of the magnet structure as well as defining the requirements of the refrigerator for the cryogenic system. Based on the Joule heating calculation, it was revealed that the bulk temperature rising of the magnet coil structure was less than 1 K. The local maximum temperature especially at the inboard leg of the TF coil structure increase as high as about 21 K for the plasma vertical disruption scenario. For the CS coil structure maximum temperature of 8.4 K was obtained from PF fast discharging scenario.

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Comparison Study of Interoperability of Railway Wireless Communication Networks (철도 무선통신망 연동방안 비교)

  • Cho, Woong
    • The Journal of the Korea institute of electronic communication sciences
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    • v.11 no.8
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    • pp.729-734
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    • 2016
  • The current domestic railway wireless communication networks transmit and receive data using several communication schemes such as VHF, TRS-ASTRO, and TRS-TETRA depending on the specific region. Recently, LTE scheme has been adopting in railway wireless communication systems to provide various services and increase reliability. It is critical to support the network interoperability between the existing communication schemes and new communication scheme for seamless data transmission. In this paper, we propose two interoperability schemes in railway communications networks, i.e., network oriented scheme and terminal oriented scheme. We consider the operation scenario for each scheme and compare two interoperability schemes. The practical implementation issues are also discussed based on suggested schemes.

A study on dissolved air flotation (DAF) process control using decision algorithm (의사결정 알고리즘을 이용한 DAF 공정 제어에 관한 연구)

  • Jung, Woosik;An, Ju-Suk;Park, Ji-Young;Oh, Hyun-Je
    • Journal of Korean Society of Water and Wastewater
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    • v.31 no.5
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    • pp.409-414
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    • 2017
  • In this study, we divided the process operation scenarios into three categories based on raw water temperature and turbidity. We will select and operate the process operation scenario according to the characteristics of the raw water. The number of algae in the DAF treated water has been analyzed to be less than 100 cells/mL. These results indicated that the DAF process is effective in removing the algae. In addition, the scenario of the integrated management decision algorithm of the DAF process was developed. DAF pilot plants ($500m^3/day$) process has shown a constantly sound performance for the treatment of raw water, yielding a significantly low level of turbidity (DAF treated water, 0.21~1.56 NTU).

Research on Deriving Requirements through Operational Scenarios and Interface Analysis of Future Logistics Transportation System based on Underground Tunnels (지하터널기반 미래물류 운송체계의 운영 시나리오 및 인터페이스 분석을 통한 요구사항 도출 연구)

  • Myung Sung Kim; Sung Jin Lee;Young Min Kim;Na Hyun Yi
    • Journal of the Korean Society of Systems Engineering
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    • v.20 no.spc1
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    • pp.65-75
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    • 2024
  • As the demand for logistics services increases rapidly in modern society, the existing freight delivery system through road transportation is caused various problems such as traffic congestion and greenhouse gas emissions. To solve that, the development of an 'underground logistics tunnel-based cargo transportation system' is currently being considered in Korea. In order to build a new concept stable and safe logistics system, derive system design requirements and functional specifications, and reflect them at the development of target system. In this study, to make foundation for development of an "underground logistics tunnel-based cargo transportation system," define system components through analysis from a hierarchical perspective, and the functions of each component were analyzed and defined. We identified what interfaces the components have at each stage of the operating process. Lastly, we defined a detailed operation scenario based on the previously derived results, deriving target system functional requirements.

An Analysis on the Wartime Sealift Operation Capability of Korea (한국의 전시 해상수송능력 분석)

  • 조윤철;이상진
    • Journal of the military operations research society of Korea
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    • v.28 no.1
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    • pp.29-46
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    • 2002
  • This study focuses primarily on the construction of the wartime sealift operation model from US to Korea. There are some uncertainties in the process of sealift operation such as the procurement rate of materiel in US, the distribution of KFS on four initial position locations at the start of the activation, and the number of ports and berths in the SPOES and SPODS. The sealift capability, based on the allocation of sealift assets such as the number of vessels, berths, and ports, is evaluated through simulation. The simulation is executed with a baseline wartime scenario and then the results are analyzed through a sensitivity analysis. The military planner may use of this model as a standard for establishing effective and concrete sealift operation plan in the near future.