• Title/Summary/Keyword: Hub Connection

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A Graph Layout Algorithm for Scale-free Network (척도 없는 네트워크를 위한 그래프 레이아웃 알고리즘)

  • Cho, Yong-Man;Kang, Tae-Won
    • Journal of KIISE:Computer Systems and Theory
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    • v.34 no.5_6
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    • pp.202-213
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    • 2007
  • A network is an important model widely used in natural and social science as well as engineering. To analyze these networks easily it is necessary that we should layout the features of networks visually. These Graph-Layout researches have been performed recently according to the development of the computer technology. Among them, the Scale-free Network that stands out in these days is widely used in analyzing and understanding the complicated situations in various fields. The Scale-free Network is featured in two points. The first, the number of link(Degree) shows the Power-function distribution. The second, the network has the hub that has multiple links. Consequently, it is important for us to represent the hub visually in Scale-free Network but the existing Graph-layout algorithms only represent clusters for the present. Therefor in this thesis we suggest Graph-layout algorithm that effectively presents the Scale-free network. The Hubity(hub+ity) repulsive force between hubs in suggested algorithm in this thesis is in inverse proportion to the distance, and if the degree of hubs increases in a times the Hubity repulsive force between hubs is ${\alpha}^{\gamma}$ times (${\gamma}$??is a connection line index). Also, if the algorithm has the counter that controls the force in proportion to the total node number and the total link number, The Hubity repulsive force is independent of the scale of a network. The proposed algorithm is compared with Graph-layout algorithm through an experiment. The experimental process is as follows: First of all, make out the hub that exists in the network or not. Check out the connection line index to recognize the existence of hub, and then if the value of connection line index is between 2 and 3, then conclude the Scale-free network that has a hub. And then use the suggested algorithm. In result, We validated that the proposed Graph-layout algorithm showed the Scale-free network more effectively than the existing cluster-centered algorithms[Noack, etc.].

Case Studies and Implications on Development Strategies of International Arbitration Hub in Major Asian Countries: Focused on Singapore and Hong Kong (아시아 중재 선진국의 국제중재 허브 육성전략 사례 분석 및 시사점 - 싱가포르와 홍콩을 중심으로 -)

  • Lee, Sangha;Ha, Choong-Lyong
    • Journal of Arbitration Studies
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    • v.29 no.4
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    • pp.101-120
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    • 2019
  • This study examines the development strategies of the arbitration industry in Singapore and Hong Kong, and its purpose is to provide implications for the development of the arbitration industry in South Korea. The main strategies implemented by Singapore and Hong Kong to develop the arbitration industry are as follows: first, improvement of the arbitration law system; second, active support of the government for promoting the arbitration industry; third, build up of an effective arbitration expert training system; and fourth, an arbitration-friendly attitude of the court. In order for South Korea to become an international arbitration hub in Northeast Asia, it is necessary to refer to the above-mentioned strategies. In addition, South Korea needs to develop marketing strategies that can differentiate itself from Singapore and Hong Kong, such as the development of an arbitration system in connection with the 4th Industrial Revolution, differentiation of the disputes sector, use of geographical advantages and a penetration pricing strategy, and support of the Korean Commercial Arbitration Board. In terms of marketing strategy, there are few studies on the development strategy of the arbitration industry in South Korea. In this respect, this study has academic value and differentiation.

A study on Improvement of Bandwidth Efficiency to FSS Internet with Spoofing and Cash Function

  • Hong Wan-Pyo
    • Journal of information and communication convergence engineering
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    • v.3 no.3
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    • pp.123-130
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    • 2005
  • This study performed five methods of tests and measurements to verify the improvement of connection time and bandwidth efficient of FSS (fixed satellite service) TCP/IP network by means of the cash function and the spoofing function. Tests and measurements are performed with; 1. Not to apply the cash and spoofing function 2. Apply the cash function 4. Apply both cash and spoofing function in HUB station and VSAT 5. In a typical commercial terrestrial Internet with LAN. The study results in this paper show that application of the spoofing and cash function greatly improves the bandwidth efficiency to FSS TCP/IP Internet service.

Design investigation of the stress reduction of bolted joint connection components in a large wind turbine blade (대형 풍력발전기 블레이드의 볼트체결부 응력감소를 위한 설계연구)

  • Kwang Tae Ha;June Hur;Jae-Ho Jeong
    • Journal of Wind Energy
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    • v.13 no.4
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    • pp.42-49
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    • 2022
  • Today, the power capacity of a wind turbine and the size of a blade is increasing to capture more wind resources, reduce the number of wind turbines on a wind farm, and reduce the cost of energy. As the blade size becomes larger, attention is being paid to the structural integrity of the blade root connection due to the heavy gravitational load effect and increased aerodynamic loads on the large blade, which could cause catastrophic failure of the blade. Therefore, the secure bolted joint connection of the blade to the hub is very important. In this paper, attention was given to the stress concentration factor (SCF) at the first thread between the M42 bolt and nut. The effect of various design parameters on the stress concentration factor was investigated, which included nut type, nut height, and reduced shank bolt. From a close design investigation of the numerical results, it turned out that the use of a reduced shank bolt resulted in the largest reduction of the stress concentration factor by 40 %, and the round nut type also reduced the SCF by 10 %, which will be beneficial to large wind turbine blades over 100 meters.

Development of a Simulator for the Intermediate Storage Hub Selection Modeling and Visualization of Carbon Dioxide Transport Using a Pipeline (파이프라인을 이용한 이산화탄소 수송에서 중간 저장 허브 선정 모델링 및 시각화를 위한 시뮬레이터 개발)

  • Lee, Ji-Yong
    • The Journal of the Korea Contents Association
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    • v.16 no.12
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    • pp.373-382
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    • 2016
  • Carbon dioxide Capture and Storage/Sequestration (CCS) technology has attracted attention as an ideal method for most carbon dioxide reduction needs. When the collected carbon dioxide is transported to storage via pipelines, the direct transport is made if the storage is close, otherwise it can also be transported via an intermediate storage hub. Determining the number and the location of the intermediate storage hubs is an important problem. A decision-making algorithm using a mathematical model for solving the problem requires considerably more variables and constraints to describe the multi-objective decision, but the computational complexity of the problem increases and it also does not guarantee the optimality. This research proposes an algorithm to determine the location and the number of the intermediate storage hub and develop a simulator for the connection network of the carbon dioxide emission site. The simulator also provides the course of transportation of the carbon dioxide. As a case study, this model is applied to Korea.

A basic Research on the Euro-Asian Continental Rail Corridor for Effective Connection and Operation (대륙횡단철도 연계운영의 효율화를 위한 기초조사)

  • Na Hee-Seung;Son Ji-Eon;Cho Young-Geol
    • Proceedings of the KSR Conference
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    • 2004.06a
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    • pp.534-541
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    • 2004
  • To boost the Korean peninsula as a logistical hub of North-East Asia in 21st century is an important part of Korean development strategies. This research has been conducted on the premise that the connection and operation of the Korean Peninsula break-railway and Euro-Asian railway network will be a great drive for Korean economy and railway technology development. For the preparation to do a further research on this subject, this paper introduces the general condition and related basic material for the railway network operation through the countries along the corridor. It also provides the basic data of railway and actual operation condition in the involved Euro- Asian areas, such as Russia, China, Mongolia, Kazakh-stan, etc.

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A Branch-and-price Approach to the ATM Switching Node Location Problem

  • Kim, Deokseong;Park, Sunsoo;Lee, Kyungsik;Park, Kyungchul
    • Industrial Engineering and Management Systems
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    • v.3 no.2
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    • pp.92-99
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    • 2004
  • We consider the ATM switching node location problem (ANLP). In this problem, there are two kinds of facilities, hub facilities and remote facilities, with different capacities and installation costs. We are given a set of customers with each demand requirements, a set of candidate installation sites of facilities, and connection costs between facilities. We need to determine the locations to place facilities, the number of facilities for each selected location, the set of customers who are connected to each installed hub via installed remote facilities with minimum cost, while satisfying demand requirements of each customer. We formulate this problem as a general integer programming problem and solve it to optimality. In this paper, we present a preprocessing procedure to tighten the formulation and develop a branch-and-price algorithm. In the algorithm, we consider the integer knapsack problem as the column generation problem. Computational experiments show that the algorithm gives optimal solutions in a reasonable time.

Failure Examples Study for Tribological Characteristics of Drive Shaft and Axle System in Vehicles (자동차 드라이브 샤프트와 액슬 시스템의 트라이볼로지적인 특성에 관한 고장사례 고찰)

  • Lee, Il Kwon;Moon, Hak Hoon;Youm, Kwang Wook
    • Tribology and Lubricants
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    • v.29 no.6
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    • pp.397-402
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    • 2013
  • This study examined the tribological characteristics of the drive shaft and axle system in vehicles. The first drive shaft example contained end play for a CV joint that transferred part of the transmission power to the wheel. The joint part of the drive shaft was deformed because of reduced durability due to wear. Thus, vibrations caused the body to shake and become unbalanced when the drive shaft transferred the power. The second example was the cross-section of a shaft that connected the slip-connection of the propeller shaft on the input side to the yoke flange of the output side; the durability was reduced because of corrosion. End play caused by wear between the bearing and cross-section shaft appeared to cause shaking. In the third example, a grease leak reduced lubrication and thus caused damage to the hub bearing and inside the knuckle. The failure was produced by sticking. The fourth example had noise produced by the gear and gear transfer. This was due to the backlash of the pinion and few ring gears for the differential gear. Therefore, drive shaft and axle systems must be thoroughly checked and managed to minimize and reduce failure phenomena.

Study on Ways to Vitalize Gwangyang Port through the e-Business Environment - Centering on Gwangyang Port Websites - (e-비즈니스 환경에 따른 광양항 활성화 방안에 관한 연구 - 광양항 관련 웹사이트를 중심으로 -)

  • Choe, Seong-Hui
    • Journal of Korea Port Economic Association
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    • v.24 no.3
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    • pp.125-146
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    • 2008
  • Port marketing using websites in the e-business environment is essential in response to the competition to become hub ports, especially since shipping companies, ports' major customers, are being pressed by shippers to reduce logistics costs and introduce large ships to realize economies of scale, thereby reducing the number of ports of call. In this sense, this study intends to approach the port industry from the perspective of e-business and suggest vitalization methods using Gwangyang Port websites(6C; contents, community, communication, connection, commerce, customization) as one of the ways to turn it into Northeast Asia's hub port of logistics.

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nArgBP2 as a hub molecule in the etiology of various neuropsychiatric disorders

  • Lee, Sang-Eun;Chang, Sunghoe
    • BMB Reports
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    • v.49 no.9
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    • pp.457-458
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    • 2016
  • Recent studies have strongly implicated postsynaptic scaffolding proteins such as SAPAP3 or Shank3 in the pathogenesis of various mood disorders, including autism spectrum disorder, bipolar disorder (BD), and obsessive-compulsive disorders. Neural Abelson-related gene-binding protein 2 (nArgBP2) was originally identified as a protein that interacts with SAPAP3 and Shank3. Recent study shows that the genetic deletion of nArgBP2 in mice leads to manic/bipolar-like behavior resembling symptoms of BD. However, the function of nArgBP2 at synapse, or its connection with the synaptic dysfunctions, is completely unknown. This study provides compelling evidence that nArgBP2 regulates the spine morphogenesis through the activation of Rac1/WAVE/PAK/cofilin pathway, and that its ablation causes a robust and selective inhibition of excitatory synapse formation, by controlling actin dynamics. Our results revealed the underlying mechanism for the synaptic dysfunction caused by nArgBP2 downregulation that associates with analogous human BD. Moreover, since nArgBP2 interacts with key proteins involved in various neuropsychiatric disorders, our finding implies that nArgBP2 could function as a hub linking various etiological factors of different mood disorders.