• Title, Summary, Keyword: Global Grid

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A Study on the Way of ROK's GIG Construction to enable NCW (NCW 구현을 위한 한국군 GIG 구축 방향에 관한 연구)

  • Kim, Hye-Lyeong;Choi, Sang-Yeong
    • Journal of the military operations research society of Korea
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    • v.34 no.3
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    • pp.53-66
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    • 2008
  • Information Grid that connects Sensor Grid and Shooter Grid with network is the core infrastructure to enable the NCW concept. The U.S. DoD(Department of Defense) has developed the GIG(Global Information Grid) as the Information Grid that connects all of the DoD mission areas. Then the U.S. DoD has incrementally constructed GIG. In this respect, the case of the U.S. DoD's GIG construction refers to materializing ROK Information Grid concept. Therefore we studied the U.S. DoD's GIG construction trend and analyzed ROK's GIG construction trend. In result this paper proposes the way to develop and construct ROK's GIG.

Mission Oriented Global Path Generation for Unmanned Combat Vehicle Based on the Mission Type and Multiple Grid Maps (임무유형과 다중 격자지도 기반의 임무지향적 전역경로 생성 연구)

  • Lee, Ho-Joo;Lee, Young-Il;Lee, Myung-Chun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.2
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    • pp.180-187
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    • 2010
  • In this paper, a global path generation method is suggested using multiple grid maps connected with the mission type of unmanned combat vehicle(UCV). In order to carry out a mission for UCV, it is essential to find a global path which is coincident with the characteristics of the mission. This can be done by considering various combat circumstances represented as grid maps such as velocity map, threat map and communication map. Cost functions of multiple grid maps are linearly combined and normalized to them simultaneously for the path generation. The proposed method is realized using $A^*$, a well known search algorithm, and cost functions are normalized in the ratio of the traverse time which is one of critical information should be provided with the operators using the velocity map. By the experiments, it is checked found global paths match with the mission type by reflecting input data of grid maps properly and the computation time is short enough to regenerate paths in real time as combat circumstances change.

A Study on Global Scheduler for Computing Resources and Network Resources Management (컴퓨팅 자원 및 네트워크 자원의 관리를 위한 티켓 기반 글로벌 스케줄러에 관한 연구)

  • Lim, Chang-Sun;Ahn, Seong-Jin;Chung, Jin-Wook;Park, Jin-Sub
    • Convergence Security Journal
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    • v.9 no.4
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    • pp.13-19
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    • 2009
  • In this paper, the integrated management of grid resources for conducting research on the global scheduler, the proposed plan is designed for. Research on the global scheduler and the grid system as a global scheduler for the system to understand the concept of a global scheduler configuration was necessary to check conditions. And other global scheduler, global positioning system and the differentiation of a ticket-based system was introduced to the concept. Finally, this paper proposed by the global scheduler for the system design, through prototyping to determine the actual effect can be used to determine whether is was.

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A Global Optimal Approach for Robot Kinematics Design using the Grid Method

  • Park Joon-Young;Chang Pyung-Hun;Kim Jin-Oh
    • International Journal of Control, Automation, and Systems
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    • v.4 no.5
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    • pp.575-591
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    • 2006
  • In a previous research, we presented the Grid Method and confirmed it as a systematic and efficient problem formulation method for the task-oriented design of robot kinematics. However, our previous research was limited in two ways. First, it gave only a local optimum due to its use of a local optimization technique. Second, it used constant weights for a cost function chosen by the manual weights tuning algorithm, thereby showing low efficiency in finding an optimal solution. To overcome these two limitations, therefore, this paper presents a global optimization technique and an adaptive weights tuning algorithm to solve a formulated problem using the Grid Method. The efficiencies of the proposed algorithms have been confirmed through the kinematic design examples of various robot manipulators.

The Design and Implementation of an Available Bandwidth Measurement Scheme in the K*Grid System

  • Hahm, Seong-Il;Cho, Seong-Ho;Choi, Han;Kim, Chong-Kwon;Lee, Pill-Woo
    • Journal of Information Processing Systems
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    • v.2 no.2
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    • pp.101-106
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    • 2006
  • Grid computing is an emerging technology that enables global resource sharing. In Korea, the $K^*$Grid provides an extremely powerful research environment to both industries and academia. As part of the $K^*$Grid project, we have constructed, together with the Korea Institute of Science and Technology Information and a number of domestic universities, a supercomputer Grid test bed which connects several types of supercomputers based on the globus toolkit. To achieve efficient networking in this Grid testbed, we propose a novel method of available bandwidth measurement, called Decoupled Capacity measurement with Initial Gap (DCIG), using packet trains. DCIG can improve the network efficiency by selecting the best path among several candidates. Simulation results show that DCIG outperforms previous work in terms of accuracy and the required measurement time. We also define a new XML schema for DCIG request/response based on the schema defined by the Global Grid Forum (GGF) Network Measurement Working Group (NM-WG).

Fabrication of Ag Grid Patterned PET Substrates by Thermal Roll-Imprinting for Flexible Organic Solar Cells (가열롤 임프린팅 방법을 이용한 유연 유기태양전지용 Ag 그리드 패턴 PET 기판 제작)

  • Cho, Jung Min;Jo, Jeongdai;Kim, Taeil;Kim, Dong Soo
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.11
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    • pp.993-998
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    • 2014
  • Silver (Ag) grid patterned PET substrates were manufactured by thermal roll-imprinting methods. We coated highly conductive layer (HCL) as a supply electrode on the Ag grid patterned PET in the three kinds of conditions. One was no-HCL without conductive PEDOT:PSS on the Ag grid patterned PET substrate, another was thin-HCL coated with ~50 nm thickness of conductive PEDOT:PSS on the Ag grid PET, and the other was thick-HCL coated with ~95 nm thickness of conductive PEDOT:PSS. These three HCLs in order showed 73.8%, 71.9%, and 64.7% each in transmittance, while indicating $3.84{\Omega}/{\Box}$, $3.29{\Omega}/{\Box}$, and $2.65{\Omega}/{\Box}$ each in sheet resistance. Fabrication of organic solar cells (OSCs) with HCL Ag grid patterned PET substrates showed high power conversion efficiency (PCE) on the thin-HCL device. The thick-HCL device decreased efficiency due to low open circuit voltage ($V_{OC}$). And the Ag grid pattern device without HCL had the lowest energy efficiency caused by quite low short current density ($J_{SC}$).

A Terrain Analysis System for Global Path Planning of Unmanned Ground Vehicle (무인지상차량의 전역경로계획을 위한 지형정보 분석 시스템)

  • Park, Won-Ik;Lee, Ho-Joo;Kim, Do-Jong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.16 no.5
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    • pp.583-589
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    • 2013
  • In this paper, we proposed a system that efficiently provides support maps which includes the grid based terrain analysis information. To do this, we use the FDB which is defined as a GIS database that contains features with attributes attached to the features. The FDB is composed of a number of features and feature classes. In order to create support maps, it is necessary to classify feature classes that are associated with each support map and to search them in a grid map. The proposed system use a ontology model to classify semantically feature classes and the quad-tree data structure to find them in a grid map quickly. Therefore, our system is expected to be utilized for global path planning of UGV. In this paper, we show the possibility through an experimental implementation.

Unstructured Quadrilateral Surface Grid Generation and Cell Size Control

  • Kim, Byoung-Soo
    • 한국전산유체공학회:학술대회논문집
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    • pp.386-389
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    • 2008
  • In this paper grid generation of unstructured quadrilateral surface grids is described. The current approach uses conventional Advancing Front Method which is used to generate unstructured triangular grids. Grid cell size control is done by using closeness-based global interpolation method controlled by pre-described control elements. Algorithm and procedure for quadrilateral grid generation using AFM method and cell size control method are described. Examples of quadrilateral grid generation are shown, and difficulties and problems related to the current approach are also discussed.

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Unstructured Quadrilateral Surface Grid Generation and Cell Size Control

  • Kim, Byoung-Soo
    • 한국전산유체공학회:학술대회논문집
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    • pp.386-389
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    • 2008
  • In this paper grid generation of unstructured quadrilateral surface grids is described. The current approach uses conventional Advancing Front Method which is used to generate unstructured triangular grids. Grid cell size control is done by using closeness-based global interpolation method controlled by pre-described control elements. Algorithm and procedure for quadrilateral grid generation using AFM method and cell size control method are described. Examples of quadrilateral grid generation are shown, and difficulties and problems related to the current approach are also discussed.

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Dual-Algorithm Maximum Power Point Tracking Control Method for Photovoltaic Systems based on Grey Wolf Optimization and Golden-Section Optimization

  • Shi, Ji-Ying;Zhang, Deng-Yu;Ling, Le-Tao;Xue, Fei;Li, Ya-Jing;Qin, Zi-Jian;Yang, Ting
    • Journal of Power Electronics
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    • v.18 no.3
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    • pp.841-852
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    • 2018
  • This paper presents a dual-algorithm search method (GWO-GSO) combining grey wolf optimization (GWO) and golden-section optimization (GSO) to realize maximum power point tracking (MPPT) for photovoltaic (PV) systems. First, a modified grey wolf optimization (MGWO) is activated for the global search. In conventional GWO, wolf leaders possess the same impact on decision-making. In this paper, the decision weights of wolf leaders are automatically adjusted with hunting progression, which is conducive to accelerating hunting. At the later stage, the algorithm is switched to GSO for the local search, which play a critical role in avoiding unnecessary search and reducing the tracking time. Additionally, a novel restart judgment based on the quasi-slope of the power-voltage curve is introduced to enhance the reliability of MPPT systems. Simulation and experiment results demonstrate that the proposed algorithm can track the global maximum power point (MPP) swiftly and reliably with higher accuracy under various conditions.