• Title/Summary/Keyword: Universal Mechanism

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THE ACCELERATION AND TRANSPORT OF COSMIC RAYS WITH HELIOSPHERIC EXAMPLES

  • JOKIPII J. R.
    • Journal of The Korean Astronomical Society
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    • v.37 no.5
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    • pp.399-404
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    • 2004
  • Cosmic rays are ubiquitous in space, and are apparently present wherever the matter density is small enough that they are not removed by collisions with ambient particles. The essential similarity of their energy spectra in many different regions places significant general constraints on the mechanisms for their acceleration and confinement. Diffusive shock acceleration is at present the most successful acceleration mechanism proposed, and, together with transport in Kolmogorov turbulence, can account for the universal specta. In comparison to shock acceleration, statistical acceleration, invoked in many situations, has significant disadvantages. The basic physics of acceleration and transport are discussed, and examples shown where it apparently works very well. However, there are now well-established situations where diffusive shock acceleration cannot be the accelerator. This problem will be discussed and possible acceleration mechanism evaluated. Statistical acceleration in these places is possible. In addition, a new mechanism, called diffusive compression acceleration, will be discussed and shown to be an attractive candidate. It has similarities with both statistical acceleration and shock acceleration.

ENTERPRISE WIDE CENTRALIZED APPLICATION LEVEL ACCESS CONTROL USING XACML

  • Shaikh, Riaz A.;Rajput, Saeed;Zaidi, S.M.H.;Sharif, Kashif
    • Proceedings of the CALSEC Conference
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    • 2005.03a
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    • pp.62-67
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    • 2005
  • In traditional approach, enterprise-wide consistent security policy enforcement for applications is very difficult task. Therefore, industry is now moving towards new unified enterprise application security concept that consist of centralized authentication and authorization mechanism. The eXtensible Access Control Markup Language (XACML); an XML-based standard defined by OASIS, is most suitable choice which can support centralized, role based, context aware access control mechanism. It is designed to provide universal standard for writing authorization policies and access control request/response language for managing access to the resources. This paper includes a brief overview on XACML and discusses its benefits, limitations and a data flow process. We propose a new generic access control architecture that supports enterprise wide centralized application level access control mechanism using XACML. The other benefits which can be achieved through this architecture are, reduce adnministration cost and complexity, support of heterogeneous computing platforms, centralized monitoring system, automatic fail over, scalability and availability, open standard based solution and secure communication.

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Development of Wire Clamping Transfer Mechanism for Tapered Helical Shape (테이퍼진 나선가공 연삭기를 위한 와이어 클램핑 이송기구의 개발)

  • Eun, Suin;Maeng, Heeyoung
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.26 no.2
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    • pp.257-261
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    • 2017
  • Drilling file is medical mini-drill which is made of Ni-Ti material and has tapered shape. It's for removing teeth nervine which helps the endodontic treatment. All files, saled at domestic market, are imported from U.S. and Europe. Also they have low manufacturing efficiency and high price because it is made by universal 5 axis CNC grinding machine. To solve these problem, 3 axis CNC table, controllable tilting angle spindle and helix angle moving table are devised. To confirm divised CNC grinding machine's manufacturing accuracy, conveying amount and finish product size measurement expreiment has been practiced. Also to automate all manufacturing processes, automatic mechanism is designed.

Premature Failure of Deep Grooved Ball Bearing for Automobiles : Part 1 - A Failure Mechanism (자동차용 깊은홈 볼베어링의 조기파손 : 1보 - 파손기구의 규명)

  • Hyun Joons;Park Tae Jo
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2003.11a
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    • pp.388-394
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    • 2003
  • This paper deals with a premature failure mechanism of deep grooved ball bearing for automobiles. A close examination of used bearings revealed that the premature failure could be arose by dents on the ball. Universal testing machine with specially designed tools is used to simulate the practical dents on the ball and test bearings are assembled with dented balls and new hearing components. The endurance test results showed that the dents on the balls were printed on the races and these phenomena come to premature failure.

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A Handover Mechanism in Internetworking with UMTS/WLAN based on HMIPv6 (HMIPv6 기반의 UMTS/WLAN 연동 네트워크에서의 핸드오버 방안)

  • Jeong Eunjoo;Park Sangjun;Lee Hyewon K.;Kim Jaeha;Kim Byunggi
    • Journal of KIISE:Information Networking
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    • v.32 no.4
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    • pp.508-514
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    • 2005
  • The research in internetworking between UMTS and WLAN, which is completed with merits and demerits, Is actively progressed to establish global roaming environments. This internetworking is classified into two groups: loosely-coupled and tightly-coupled. h tightly-coupled mechanism demands lots of investment and considerable amountof time to construct, which is directly connoted between UNTS and WLAN via IWU. On the other hand, a tersely-coupled mechanism is more scalable and easier to implement than a tightly-coupled one while it has critical drawbacks of packet loss and blocking of services due to handover delay. To alleviate these drawbacks. this work proposes a handover scheme between UMTS and WLAN, which is based on HMIPv6. The performance of the proposed scheme is evaluated by the simaulation. The proposed internetworking scheme based on HMIPv6 shows hotter performance than those based on MIPv6.

A Fast Universal Video Distribution Protocol For Video-On-Demand Systems (주문형 비디오 시스템을 위한 빠른 광범위한 비디오 배포 기법)

  • Kwon Hyeok Min
    • The KIPS Transactions:PartB
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    • v.11B no.7 s.96
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    • pp.803-812
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    • 2004
  • The performance of video-on-demand(VOD) systems is known to be mainly dependent on a scheduling mechanism which they employ. Broadcast-based scheduling schemes have attracted a lot of attention as an efficient way of distributing popular videos to very large client populations. The main motivations of broadcasting scheduling mechanisms are that they scale up extremely well and they have very modest bandwidth requirements. This paper studies this issue and proposes a new broadcasting scheduling mechanism, named fast universal video dis-tribution(FUVD). FUVD scheme dynamically constructs a video broadcasting schedule in response to client requests, and broadcasts video seg-ments according to this schedule. This paper also evaluates the performance of FUVD on the basis of a simulation approach. The simulation results indicate that FUVD protocol shows a superior performance over UD, CBHD, and NPB in terms of the average response time.

A Study on Web Accessibility Status of Metropolitan and Provincial Offices of Education from the Universal Design View (유니버설 디자인 관점에서 본 국내 시도 교육청의 웹 접근성 실태에 관한 연구)

  • Seo, Mi-Ra
    • Journal of Digital Convergence
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    • v.11 no.5
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    • pp.405-410
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    • 2013
  • Due to the enforcement of a law about disability nondiscrimination and rights protection in 2008, the web accessibility has become an obligation. According to a survey targeting public sectors such as central administrative organization, local autonomous entity and etc., the level of compliance with web accessibility appeared to be improved every year. However, such legal mechanism focuses on the improvement of convenience for disabled people only and does not meet the concept of universal design that aims to satisfy every user. Therefore, this study verifies the status of web accessibility on 17 homepages of metropolitan and provincial offices of education. The status survey was carried out with 3 steps: 1) Verification through automated verification tool by National Information Society Agency, 2) Verification through Web Content Accessibility Guidelines(UD-WCAG) that adopts the concept of universal design, 3) Verification by using screen reader. Compared to the verification through automated verification tool, the overall compliance rate verified through UD-WCAG was reported lower.

A Design of Vertical Handoff Mechanism based USHA to Support Extensibility and Reliability (USHA 기반의 확장성과 신뢰성을 제공하는 수직 핸드오프 기법 설계)

  • 강정호;윤미연;전진영;신용태
    • Proceedings of the Korean Information Science Society Conference
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    • 2004.10c
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    • pp.58-60
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    • 2004
  • 차세대 네트워크의 출현으로 다양한 형태의 통신망 들 간의 융합이 중요해졌다. 무선 망의 경우 이질적인 망들 간의 통합 및 융합이 이루어지기 위해서는 끊김 없는 이동성 지원이 매우 중요하다. 끊김 없는 이동성 지원은 이질적인 무선망 간의 이동시에도 지속적으로 세션을 유지하는 기능을 말한다. 이러한 기능을 핸드오프 기법이라 하며 현재 다양한 연구가 진행 중이다. 본 논문에서는 현재 제안되어 있는 핸드오프 기법 중 USHA(Universal Seamless Handoff Architecture)를 기반으로 하여 적용하기 쉬우며 확장성과 신뢰성을 보장하는 핸드오프 모델을 제안한다.

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Precise Measurement Method of Radial Artery Pulse Waveform using Robotic Applanation Tonometry Sensor (로보틱 토노메트리 센서를 이용한 요골 동맥 파형 정밀 측정 방법)

  • Kim, Young-Min
    • Journal of Sensor Science and Technology
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    • v.26 no.2
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    • pp.135-140
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    • 2017
  • In this paper, a novel measurement method of radial artery pulse waveform using robotic applanation tonometry (RAT) was present to reduce the errors by the pressing direction of the vessel. The RAT consisted of an array of pressure sensors and 2-axis tilt sensor, which was attached to the universal joint with a linear spring and five-DOF robotic manipulator with a one-axis force sensor. Using the RAT mechanism, the pulse sensor could be manipulated to perpendicularly pressurize the radial artery. A pilot experimental result showed that the proposed mechanism could find the optimal pressurization angles of the pulse sensor within ${\pm}3^{\circ}$standard deviations. Coefficient values of variation of maximum pulse peaks extracted from the pulse waveforms were 4.692, 6.994, and 11.039 % for three channels with the highest magnitudes. It is expected that the proposed method can be helpful to develop more precise tonometry system measuring the pulse waveform on the radial artery.

A Study on the Spring Design of Smooth Lifting System for Monitor (모니터용 유연 승강의 스프링 설계에 관한 연구)

  • Cheong, Seon-Hwan;Choi, Seong-Dae;Byun, Yong-Kun;Choi, Eun-Hwan
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.4
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    • pp.48-53
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    • 2005
  • This research is materialized the mechanism of a interlocking elevator device to meet with customer's requirement demanding a variety of function. On this suitably theoretical translation and by considering of material significance of the most factor's tension spring and torsion spring, it's compared and reviewed the stress's calculation according that SWC and SWPB applied differently. And also that is approved through actual experiment. Out of a variety of feasible movement. Torque Balance is materialized by combination of tension spring, torsion spring and disk spring. So that application of 3 factors for optimal design is very important factor. In future, this research thesis make sure to play a highly role for application and improvement mechanically in various industry sector out of materializing interlock.

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