• 제목/요약/키워드: Energy Transmission

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수소배관 운영 조건에 따른 배관강이 수소취성에 미치는 영향 인자 분석 (Analysis of Influence Factors on Hydrogen Embrittlement of Pipe Steel according to Hydrogen Pipeline Operating Conditions)

  • 백종현;장윤찬;김철만
    • 한국수소및신에너지학회논문집
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    • 제35권2호
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    • pp.216-229
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    • 2024
  • Pipeline steels for hydrogen transmission may cause hydrogen embrittlement due to absorption and diffusion of hydrogen through metals. Hydrogen pipes exhibited similar mechanical properties to atmospheric conditions in terms of tensile and yield strength in a hydrogen atmosphere. This paper aims to provide relevant information regarding hydrogen embrittlement in hydrogen transmission pipeline.

전압원인버터방식 송전용 무효전력보상기의 제어시스템 설계 (Control System Design for Self-Commutated Static Var Compensator)

  • 한병문
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 1996년도 창립기념 전력전자학술발표회 논문집
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    • pp.89-92
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    • 1996
  • This paper describes a detailed simulation model of the static condenser (STATCON) to analyze the dynamic interaction with the ac transmission line. The static condenser was represented by a 12-pulse voltage-source inverter sharing an energy storage dc capacitor. The voltage-source inverter consists of two 6-pulse bridges modeled with ideal gate-turn-off switches. The control system for the static condenser was designed through a mathematical model deduced from the equivalent circuit. Simulation results show that the conceived model is very effective to analyze the dynamic interaction between the static condenser and the ac transmission system.

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연성된 쉘 구조물의 진동 파워흐름해석 (Vibration Power Flow Analysis of Coupled Shell Structures)

  • Kim, Il-Hwan;Hong, Suk-Yoon;Park, Do-Hyun;Kil, Hyun-Gwon
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 추계학술대회논문초록집
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    • pp.352.2-352
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    • 2002
  • In this paper, Power Flow Analysis (PFA) method has been applied to the prediction of vibration energy density and intensity of coupled shell structures in the medium-to-high frequency ranges. To consider the wave transformation at joint between shell elements, power transmission and reflection coefficients are investigated for various joint angles, and here Donnell-Mushtari thin shell theory has been used. (omitted)

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파랑작용에 의해 부유식 방파제에서 발생하는 응력해석 (Numerical Analysis of the Stress on Floating Breakwater under Various Wave Conditions)

  • 조원철
    • 한국해양공학회지
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    • 제18권6호
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    • pp.29-36
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    • 2004
  • Floating breakwaters have been recently studied to reduce the transmission ratio of wave energy. The numerical study shows how wave pressure and stress act on the rectangular floating breakwater under various regular wave conditions. In order to evaluate hydrodynamic pressure on the floating breakwater, the infinite element is applied to the linear wave diffraction and radiation problems. SAP2000, a structural analysis program, is used to evaluate stress on the floating breakwater.

선로저항을 반영하는 에너지함수 유도를 위한 등가시스템 기법의 개발 (The Development of Equivalent System Technique for Deriving an Energy Function Reflecting Transfer Conductances)

  • 문영현;조병훈;노태훈;최병곤
    • 대한전기학회논문지:전력기술부문A
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    • 제48권10호
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    • pp.1175-1182
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    • 1999
  • This paper shows that a well-defined energy function can be developed to reflect the transfer conductances for multi-machine power systems under an assumption that all transmission lines have uniform R/X rations. The energy function is derived by introducing a pure reactive equivalent system for the given system. In this study, a static energy function reflecting transfer conductances is also derived as well as the transient energy function. The proposed static energy function is applied to voltage stability analysis and tested for various sample systems. The test results show that the accuracy of voltage stability analysis can be considerable improved by reflecting transfer conductances into the energy function.

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An Algorithm for Energy Efficient Cooperative Communication in Wireless Sensor Networks

  • Kumar, K. Senthil;Amutha, R.
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제10권7호
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    • pp.3080-3099
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    • 2016
  • In this paper, we propose an algorithm for energy efficient cooperative communication in wireless sensor network (WSN). The algorithm computes the appropriate transmission distance corresponding to optimal broadcast bit error probability, while taking the circuit energy consumption and the number of cooperating nodes into consideration. The algorithm guarantees minimum energy consumption by choosing higher value of bit error probability for cooperative phase and lower value of bit error probability for broadcast phase while maintaining the required end-to-end reliability. The simulation results show that the proposed algorithm provides significant energy saving gain when compared with traditional fixed distance schemes and is suitable for applications demanding energy efficiency with high quality of reception.

Avoiding Energy Holes Problem using Load Balancing Approach in Wireless Sensor Network

  • Bhagyalakshmi, Lakshminarayanan;Murugan, Krishanan
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제8권5호
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    • pp.1618-1637
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    • 2014
  • Clustering wireless sensor network is an efficient way to reduce the energy consumption of individual nodes in a cluster. In clustering, multihop routing techniques increase the load of the Cluster head near the sink. This unbalanced load on the Cluster head increases its energy consumption, thereby Cluster heads die faster and create an energy hole problem. In this paper, we propose an Energy Balancing Cluster Head (EBCH) in wireless sensor network. At First, we balance the intra cluster load among the cluster heads, which results in nonuniform distribution of nodes over an unequal cluster size. The load received by the Cluster head in the cluster distributes their traffic towards direct and multihop transmission based on the load distribution ratio. Also, we balance the energy consumption among the cluster heads to design an optimum load distribution ratio. Simulation result shows that this approach guarantees to increase the network lifetime, thereby balancing cluster head energy.

The Energy Efficient for Wireless Sensor Network Using The Base Station Location

  • Baral, Shiv Raj;Song, Young-Il;Jung, Kyedong;Lee, Jong-Yong
    • International Journal of Internet, Broadcasting and Communication
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    • 제7권1호
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    • pp.23-29
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    • 2015
  • Energy constraints of wireless sensor networks are an important challenge. Data Transmission requires energy. Distance between origin and destination has an important role in energy consumption. In addition, the location of base station has a large impact on energy consumption and a specific method not proposed for it. In addition, a obtain model for location of base station proposed. Also a model for distributed clustering is presented by cluster heads. Eventually, a combination of discussed ideas is proposed to improve the energy consumption. The proposed ideas have been implemented over the LEACH-C protocol. Evaluation results show that the proposed methods have a better performance in energy consumption and lifetime of the network in comparison with similar methods.

Fuzzy Logic based Admission Control for On-grid Energy Saving in Hybrid Energy Powered Cellular Networks

  • Wang, Heng;Tang, Chaowei;Zhao, Zhenzhen;Tang, Hui
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제10권10호
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    • pp.4724-4747
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    • 2016
  • To efficiently reduce on-grid energy consumption, the admission control algorithm in the hybrid energy powered cellular network (HybE-Net) with base stations (BSs) powered by on-grid energy and solar energy is studied. In HybE-Net, the fluctuation of solar energy harvesting and energy consumption may result in the imbalance of solar energy utilization among BSs, i.e., some BSs may be surplus in solar energy, while others may maintain operation with on-grid energy supply. Obviously, it makes solar energy not completely useable, and on-grid energy cannot be reduced at capacity. Thus, how to control user admission to improve solar energy utilization and to reduce on-grid energy consumption is a great challenge. Motivated by this, we first model the energy flow behavior by using stochastic queue model, and dynamic energy characteristics are analyzed mathematically. Then, fuzzy logic based admission control algorithm is proposed, which comprehensively considers admission judgment parameters, e.g., transmission rate, bandwidth, energy state of BSs. Moreover, the index of solar energy utilization balancing is proposed to improve the balance of energy utilization among different BSs in the proposed algorithm. Finally, simulation results demonstrate that the proposed algorithm performs excellently in improving solar energy utilization and reducing on-grid energy consumption of the HybE-Net.