• Title/Summary/Keyword: External connection method

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MPICH-GP : An MPI Extension to Supporting Private IP Clusters in Grid Environments (MPICH-GP : 그리드 상에서 사설 IP 클러스터 지원을 위한 MPI 확장)

  • Park, Kum-Rye;Yun, Hyun-Jun;Park, Sung-Yong;Kwon, Oh-Young;Kwon, Oh-Kyoung
    • The KIPS Transactions:PartA
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    • v.14A no.1 s.105
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    • pp.1-14
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    • 2007
  • MPICH-G2 is an MPI implementation to solve complex computational problems by utilizing geographically dispersed computing resources in grid environments. However, the computation nodes in MPICH-G2 are exposed to the external network due to the lack of supporting the private IP clusters, which raises the possibility of malicious security attacks. In order to address this problem, we propose MPICH-GP with a new relay scheme combining NAT(Network Address Translation) service and an user-level proxy. The proxy running on the front-end system of private IP clusters forwards the incoming connection requests to the systems inside the clusters. The outgoing connection requests out of the cluster are forwarded through the NAT service on the front-end system. Through the connection path between the pair of processes, the requested MPI jobs can be successfully executed in grid environments with various clusters including private IP clusters. By simulations, we show that the performance of MPICH-GP reaches over 80% of the performance of MPICH-G2, and over 95% in ease of using RANK management method.

Effect of Load Velocity on Seismic Performance of Steel Beam-column Connection (하중속도가 강구조 보-기둥 접합부 내진성능에 미치는 영향)

  • Lee, Ki-Won;Oh, Sang-Hoon
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.26 no.6
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    • pp.182-192
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    • 2022
  • Brittle feature is one of the fracture behaviors of structure s and has a great influence on the seismic performance of structure materials. The load velocity acts as one of the main causes of brittle fracture, and in particular, in situations such as earthquakes, a high load velocity acts on buildings. However, most of the seismic performance evaluation of the domestic and external steel connections is conducted through static experiments. Therefore, there is a possibility that brittle fracture due to factors such as degradation of material toughness and reduction of maximum deformation rate due to high load velocity during an earthquake was not sufficiently considered in the existing seismic performance evaluation. This study conducts a static test at a low load velocity according to the existing experimental method and a dynamic test at a high load velocity using a shaking table, respectively. It compares and analyzes the fracture shape and structural performance according to the results of each experiment, and finally analyzes the effect of the load velocity size on the seismic performance of the connection.

Development of 3D scanner using structured light module based on variable focus lens

  • Kim, Kyu-Ha;Lee, Sang-Hyun
    • International Journal of Advanced Culture Technology
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    • v.8 no.3
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    • pp.260-268
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    • 2020
  • Currently, it is usually a 3D scanner processing method as a laser method. However, the laser method has a disadvantage of slow scanning speed and poor precision. Although optical scanners are used as a method to compensate for these shortcomings, optical scanners are closely related to the distance and precision of the object, and have the disadvantage of being expensive. In this paper, 3D scanner using variable focus lens-based structured light module with improved measurement precision was designed to be high performance, low price, and usable in industrial fields. To this end, designed a telecentric optical system based on a variable focus lens and connected to the telecentric mechanism of the step motor and lens to adjust the focus of the variable lens. Designed a connection structure with optimized scalability of hardware circuits that configures a stepper motor to form a system with a built-in processor. In addition, by applying an algorithm that can simultaneously acquire high-resolution texture image and depth information and apply image synthesis technology and GPU-based high-speed structured light processing technology, it is also stable for changes to external light. We will designed and implemented for further improving high measurement precision.

Successful Surgical Correction of Complete Transposition of Great Arteries (S.D.D.) : 1 Case Report (Rastelli씨 수술법을 이용한 완전 대혈관전위증(S. D. D.) -치험 1예-)

  • Kang, Myung-Sik;Cho, Bum-Koo
    • Journal of Chest Surgery
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    • v.13 no.4
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    • pp.442-447
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    • 1980
  • A 8-year-old boy underwent surgical correction of complete transposition S.D.D. of great arteries combined with subaortic ventricular septal defect and pulmonary stenosis [infundibular and valvular]. The operation consisted of an internal baffling connecting the left ventricle to the aorta through the ventricular septal defect. The pulmonary stenosis was corrected with the method of external connection, the right ventricle to the pulmonary artery using the conduit valve [20 mm] contained Hancock due to abnormal distribution of left coronary artery of which conduit due to abnormal distribution of left coronary artery of which the circumflex branch crossed the portion of right ventricular outflow tract. This case was suitable for corrective surgery-Rastelli operation-and the patient`s condition in very good until present [post-operative 5 months].

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Electromechanical analysis of 2-2 cement-based piezoelectric transducers in series electrically

  • Wang, Jianjun;Shi, Zhifei
    • Smart Structures and Systems
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    • v.14 no.3
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    • pp.267-284
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    • 2014
  • This paper aims to present the analytical solutions of 2-2 cement based piezoelectric transducers in series electrically based on the theory of piezo-elastic dynamics. The solutions of two different kinds of 2-2 cement based piezoelectric transducers under external harmonic load are obtained by using the displacement method. The effects of electrical connection of piezoelectric layers, loading frequency, thickness and distance of piezoelectric layers on the characteristics of the transducers are discussed. Comparisons with other related experimental investigations are also given, and good agreement is found. The proposed 2-2 cement based piezoelectric transducers have a great potential application in monitoring structural health in civil engineering and capturing mechanical energy or monitoring train-running safety in railway system and traffic safety in road system.

Study on the Yo Bae Byoung Hoo of the Je Bung Won Hu Ron (제병원후론ㆍ요배병제후에 대한 연구)

  • An Min Sik;Jeong Heon Young
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.17 no.3
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    • pp.624-628
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    • 2003
  • JebyeongwonhuronㆍYobaebyeonjehu is well organized and detailed is stated of classification and cause, mechanism of lumbago. That is divided into nine classes according to cause and symptoms of lumbago and described those respectively. Although there is some different, classification of lumbago after ages is based on this method in the main. The outbreak mechanism of lumbago can be stated that wicked germ invade into the body in condition that spirit and energy, especially the kidney energy is poor through various reason. That is stressed on interior factors. In the relation to organs, it is inferred that outbreak of lumbago have connection with the kidney deeply.

Design of Charging and Discharging Switch Structure for Rechargeable Battery Protection IC (2차 전지 보호회로를 위한 충.방전 스위치 구조의 설계)

  • 김상민;조상준;채정석;김상호;박영진;손영철;김동명;김대정
    • Proceedings of the IEEK Conference
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    • 2001.06b
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    • pp.85-88
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    • 2001
  • This paper suggests an improved switch architecture for the rechargeable battery protection IC. In the existing protection IC, charging and discharging switches composed of the CMOS transistor and the diode are external components. It is difficult to integrate the switches in a CMOS process due to the large chip-size overhead and inevitable parasitic effects. In this paper, we propose a new switch architecture of the MOSFET's 'diode connection' method. The performance and chip-size overhead are proved to be adequate for the fully integrated protection IC.

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Analysis of Stabilizing Process for the Unstable Truss Structures using a Topology of Member Connection (구성부재의 위상을 이용한 불안정 트러스 구조물의 안정화 이행과정)

  • 권택진;김진우;김재열
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2001.04a
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    • pp.251-258
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    • 2001
  • Cable and membrane structures can be classified as a unstable structure in the view point of shape determination process. An unstable stucture at the initial state generally cannot take a role as the resistance for the external force. Therefore, there should be a stabilizing process to get the stable state of a structure and it is necessary to visualize the shape finding from unstable state to stable state. In this paper, a numerical method of stabilizing procedure for the link structures is presented. The structures are assumed to have rigid movements and thus only changing of the topology of member is considered during the analysis. The generalized inverse matrix and the principle of minimum potential energy are used in the process. Illustrative examples are presented and the results show good convergence.

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Comparison Research between Lighting Based on luminance and Illuminance through Measuring Tunnel Lighting (터널조명 측정을 통한 조도와 휘도기반의 조명 비교 연구)

  • Lee, Mi-Ae;Han, Seung-Hun;Kim, Yeon-Hwa
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.11
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    • pp.14-19
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    • 2013
  • Tunnel lighting design and operation are both regulated based on luminance in and out of Korea these days. However, domestic tunnel lighting is operated by internal lighting depending on external brightness by using an illuminometer applying the conversion factor on luminance. The purpose of tunnel lighting is to alleviate the visual shock occurring from the rapid change from external brightness to internal brightness when entering a tunnel. However, when looking at the tunnels operated based on an illuminometer, it is not a system where the driver can measure the brightness within his or her viewing angle when entering the tunnel. It is general to install and operate the illuminometer on the roof of an administrative office near the tunnel; however, this method is not structured to connect with the internal lighting by checking the brightness of the viewing scope of the driver, thus is not structured to properly apply the viewing conditions of the driver. Rather, it should be in a method for extracting the luminance value within the viewing scope of the driver pursuant to tunnel lighting standards and in connection with internal lighting. This research seeks to find the difference between operations based on luminance and operations based on intensity of Illuminance in road tunnels through field measuring, and to suggest the necessity of operating based on luminance with the resulting value.

A Study of Security Certification and Accreditation for DNP3 linkage section in EMS/SCADA (EMS/SCADA의 DNP3 연계구간 보안성 평가·인증 기술 연구)

  • Kim, Jongwan;Shon, Taeshik
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.25 no.3
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    • pp.703-713
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    • 2015
  • The linking system between the control system and the field devices in the existing EMS/SCADA, in order to increase the reliability of the data, and access control through the separation of external network. Currently, There is a tendency that the need for connection to an external network that takes into account the economic aspect, systematic management and efficiency of operations is increasing. Such is evolved linkage section, is to have more security vulnerabilities than in the past, Eventually communication EMS/SCADA linkage section requires special management method. In this paper, taking into account the domestic environment, were presented the security Certification and Accreditation technology that was applied to serial DNP3 and TCP/IP based DNP3 that are mainly used in EMS/SCADA linkage section. Presented to security of Certification and Accreditation technology, divided into Resource Robustness Test and Malicious Packet Test for evaluate the safety. Each of the security requirements and evaluation method in proposed technology, is an attempt to present the differentiation of the existing Certification and Accreditation technology.