• Title/Summary/Keyword: 효율 성

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A Study on the Development of One-way Bypass TAP Device for Strengthening the Security of Flood and Environment Surveillance Network (홍수 및 환경 감시망의 보안성 강화를 위한 단방향 Bypass TAP 장치 개발에 관한 연구)

  • Lee, Jin-Young;Kong, Heon-Tag
    • Journal of Digital Convergence
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    • v.13 no.8
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    • pp.473-481
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    • 2015
  • The flood and environment surveillance network on riverside is a network requiring a way to efficiently manage the information from all kinds of sensors, along with an optical communication device that can deliver high-quality video information at high speed. Since on-site prompt recovery is very important especially for communication problems that occurred due to cut-off or aged network, various researches have been carried out on this. However, because the security against outside hacking or outside intrusion with illegal purposes is very important for environment surveillance network, such as the national backbone network, an efficient network maintenance and repair should be enabled while satisfying security and reliability at the same time. A characteristic of requirement is that when security is improved, the efficiency of maintenance and repair drops as they are conflicting to each other. Therefore, this research proposed a system in order to satisfy the conflicting requirement and improve security, by developing a one-way Bypass TAP and an android-based smartphone app that can enable efficient network maintenance and repair.

A Study of the Human Capital Efficiency in the Korean Online Game Business using Non-parametric Analysis Model(DEA) (비모수 분석모형(DEA)을 활용한 국내 온라인게임 기업의 인적자본 효율성 연구)

  • Yoon, Gun-Woo;Ryu, Seoung-Ho
    • Journal of Korea Game Society
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    • v.9 no.2
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    • pp.81-93
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    • 2009
  • This study aims to investigate human capital in Korea's online game industry (as the representative of IT-based creative services) under the knowledge-based economy paradigm. In recognition of the importance of intellectual capital closely intertwined with human capital and the economic potential of the online game industry, Korean government has begun to show active support. In this context, this study measures the human capital efficiency in online game business by using non-parametric analysis (Data Envelopment Analysis, DEA). Most previous studies (human capital theory, knowledge based economy theory, economic growth theory) have proved that human capital has a very positive effect on sustainable growth of corporate management and wealth of nations. As such, this paper uses the DEA to obtain the efficiency of the human capital (scale, investment, education, compensation). The results of this study will suggest strategic implications on maximizing the human capital in online game corporations and provide a reference frame for government policies.

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Shape Optimization of Three-Dimensional Continuum Structures by Force Approximation Techniques (힘 근사화 기법에 의한 3차원 연속체 구조물의 형상최적화)

  • Han, Sang Hoon;Lee, Woong Jong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.13 no.1
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    • pp.39-46
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    • 1993
  • The need to develop method which can improve the shape design efficiency using high quality approximation is being brought up. In this study, to perform shape optimal design of three-dimensional continuum structures an efficient approximation method for stress constraints is proposed, based on expanding the nodal forces in Taylor series with respect to shape variables. Numerical examples are performed using the 3-D cantilever beam and fixed-fixed beam and compared with other method to demonstrate the efficiency and convergence rate of the Force Approximation method. It is shown that by taking advantage of this high quality approximation, the total number of finite element analysis required for shape optimization of 3-D continuum structures can be reduced significantly, resulting to the same level of efficiency achieved previously in sizing optimization problems. Also, shape representation by super curve technique applied to obtain optimal shape finds useful method.

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Development and Evaluation of Authority Data based Academic Paper Retrieval System (전거데이터 기반 학술논문 검색시스템의 구축 및 평가에 관한 연구)

  • Lee, Seok-Hyoung;Kwak, Seung-Jin
    • Journal of the Korean Society for Library and Information Science
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    • v.46 no.2
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    • pp.133-156
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    • 2012
  • This study aims to develop and evaluate the authority data-based academic retrieval system that may provide search tools and additional information for search of academic papers with users. To evaluate the usability of authority data-based academic paper search system, this work studied 60 subjects who had experienced the academic paper service to measure their satisfaction on both search efficiency and system usability and additionally analyzed whether the difference between search efficiency and system availability is significant in the experimental search system among user groups. As a result, the authority data-based academic paper search system was analyzed to show a higher search efficiency and user satisfaction than the ordinary system.

Effects of Hydrophobic Chain Structure of Nonionic Surfactanets on Surfactant Adsorption and Diesel Removal from Kaolin Soil (비이온계 계면활성제의 소수성 구조가 카올린 토양에서 흡착 및 경유 제거에 미치는 영향)

  • 김종성;이기세
    • Journal of Korea Soil Environment Society
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    • v.4 no.3
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    • pp.17-24
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    • 1999
  • The effects of hydrophobic chain length and its structure of nonionic surfactants on surfactant adsorption and contaminated diesel removal were studied in kaolin soil. Hydrocarbon chain length and double bond in hydrophobic tail group of nonionic surfactants affected surfactant adsorption and diesel removal efficiency from kaolin soil. The degrees of surfactant adsorption and diesel removal were closely related each other. Among nonionic surfactants we studied, surfactants with shorter hydrophobic chain length and higher HLB value showed lower degree of adsorption and higher efficiency of diesel removal. The existence of unsaturated carbons in the structure of hydrophobic chain enhanced diesel removal by reducing surfactant adsorption to kaolin soil. The best diesel removal was obtained after adsorption saturation was reached. If surfactant concentration was higher than a critical value, diesel removal was reduced probably because of precipitation. liquid crystal formation, or coacervation of surfactants at high concentration.

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A Study on RTLS Technology based YT Dynamic Operation for Efficiency of Container Terminal (컨테이너터미널 운영효율성을 위한 RTLS 기반 YT Dynamic Operation 모델)

  • Shin, Jeong-Hoon;Chang, Myung-Hee;Yu, Song-Jin
    • Journal of Navigation and Port Research
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    • v.32 no.5
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    • pp.369-377
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    • 2008
  • Interest in high productivity and streamlined operation is growing amid a heated competition between ports and mega size vessel oriented operation. It becomes clear that terminals that operate YT(Yard Tractor) for transportation in container yard have less efficiency in operation and cost comparing terminals functioning AGV(Automated Guided Vehicle) system. To offset disadvantages arising out of YT operations, continual efforts (e,g YT pooling operation) were taken place for the last decade, but the result has not been fruitful; YT pooling operation still has a problem in that it cannot read individual YT's actual location. This study suggests 'YT dynamic operation model'- a practical application of RTLS(Real Time Location System) technology which will solve YT pooling operation problems.

An Efficient Anonymous Authentication Protocol Based on Multiple Anonymous Certificates in VANET (VANET에서 다중 익명 인증서 기반 효율적인 익명 인증 프로토콜)

  • Jung, Chae-Duk;Sur, Chul;Park, Young-Ho;Rhee, Kyung-Hyune
    • The KIPS Transactions:PartC
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    • v.16C no.5
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    • pp.589-596
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    • 2009
  • Until now, some protocols have been presented to provide vehicle's anonymity and unlinkability in VANET by means of issuing multiple anonymous certificates to each vehicle from the trust authority, or shot-time anonymous certificate to a vehicle after mutual authentication between a Roadside Unit (RSU) and the vehicle. However, these protocols have high overheads of the trust authority, RSUs and vehicles for generating anonymous certificate. In this paper, we propose an efficient anonymous authentication protocol, in which RSUs can issue multiple shot-time anonymous certificates to a vehicle to alleviate system overheads for mutual authentication between vehicles and RSUs. Several simulations are conducted to verify the efficiency of the proposed protocol in terms of RSU valid serve ratio and vehicle's computational costs. Moreover, the proposed protocol provides unlinkability and traceability when multiple RSUs are compromised, whereas previous protocols do not provide unlinkability and traceability.

An Efficient Distribution Method of Inter-Session Shared Bandwidth Based on Fairness (공정성 기반의 세션간 공유 대역폭의 효율적 분배 기법)

  • Hwang, Kil-Hong;Ku, Myung-Mo;Kim , Sang-Bok
    • Journal of Korea Multimedia Society
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    • v.7 no.7
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    • pp.905-912
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    • 2004
  • It is a study LVMPD to solve the fairness problem of inter-session shared bandwidth. Whenever congestion occurs in one session, the highest layer is dropped. Also the highest layer of other sessions in non-congestion is dropped by iner-session fairness. While there is spare bandwidth, receivers of session in non-congestion can't use bandwidth efficiently. In this paper, we proposed a distribution method to use efficiently spare bandwidth that occurred by inter-session fairness. In our method, we considered the highest layer those receivers receiving and the higher layer those receivers requesting. The sender assigns the packet-deleting priority to packets when congestion occurs in receivers, and sets layer add/drop flag when receivers of session in non-congestion request the higher layer. The switch deletes packets with packet-deleting priority and transfers packets with layer add/drop flag for session in non-congestion. Therefore receivers of session in non-congestion can add the higher layer. In experimental results, it was known that proposed algorithm use the inter-session shared bandwidth more effectively compared with already known method.

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Biomechanical Effect of Forearm Flexor Muscles depending on Handle Sizes (수공구 손잡이 형태에 따른 생체역학적 영향도 분석)

  • Park, Shi-Hyun
    • Journal of the Korea Safety Management & Science
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    • v.14 no.2
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    • pp.41-48
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    • 2012
  • 수공구 사용시 과도한 힘은 작업성 근골격계 질환을 일으킬 수 있는 주요 원인중 하나이다. 이와 관련하여, 수공구 파지시 인체 내부에 부과되는 근력과 외적으로 작용된 힘 간의 비율을 이해하는 것이 중요하며, 이는 근육에 부과되는 과도한 힘을 최소화 시키고, 작업에 필요한 힘의 효율성을 극대화 시키는데 필수적이라 할 수 있다. 이러한 비율과 관련하여 많은 연구가 되어 왔으나, 대부분 수리적 인체역학적 모델과 같은 간접적 추정 방법에 의거하고 있는 실정이다. 이러한 인체역학적 모델을 검증하고 개선하기 위하여 해부용 팔 (cadaver)을 활용한 직접적인 근력과 악력 측정이 필수적이다. 본 연구에서는 이러한 해부용 팔을 이용하여 상지 굴근(hand flexor)을 자동으로 제어하고 근력과 함께 악력을 측정할 수 있는 Hand Motion Simulator를 개발하고, 이를 통하여 다양한 사이즈의 손잡이 파지시 요구되는 근력과 외적으로 적용된 악력을 비교함으로써 수공구 손잡이 사이즈에 따른 근력의 효율성에 대하여 측정을 해 보았다. 또한, 적용된 굴근 (FDP & FDS) 간의 힘 비율에 따른 파지법의 차이를 조사해 보았다. 내부에 주어진 근력은 외부로 작용된 악력보다 5.3배 높은 부하가 작용하였으며 이러한 수공구 손잡이 파지시 힘의 효율성 역시 FDP 와 FDS 간의 비율이 3:2 였을 때, 그리고 손잡이 크기가 작을수록 높은 결과를 보였다. 반대로 손잡이의 크기가 커질수록 힘의 효율성은 저하되었다. 또한, 손가락 관절 각도의 경우 FDP와 FDS간의 비율에 따라 상이한 자세를 나타내었다. FDP 굴근의 비율이 높을 경우 손가락 끝마디 관절 (DIP) 의 굴곡을 보였으며, FDS 굴근 비율이 높을 경우 손가락 두 번째 관절(PIP)의 굴곡을 보였다. 본 연구를 통한 결과는 추후 상지작업자에 대한 근골격계 질환 예방 기준안 마련 및 수공구 설계를 위한 기초자료로 활용이 가능할 것으로 보인다.

An Analysis on Difference of Convergence e-Business Valuation Factors (융복합 e-비즈니스 평가요인의 차이에 관한 분석)

  • Song, Hyung-Cheol
    • Journal of Digital Convergence
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    • v.14 no.3
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    • pp.135-141
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    • 2016
  • This paper was conducted to verify the relationship of understanding of learning, service quality, efficiency of convergence e-business valuation. For this paper, it surveyed 179 students and the data were collected Nov. 2~30, 2015. This research analyzed all the samples through ANOVA, t-test utilized by SPSS 22.0 The results as follow. First, understanding of learning, service quality, efficiency had statistically significant difference according to gender. Second, understanding of learning, service quality, efficiency showed statistically significant difference according to grade. The results of this study reveal the fact that the general characteristics like gender and grade made difference to the understanding of learning, service quality, efficiency. Furthermore, this paper may need to include various variables of understanding of learning, service quality, efficiency and suggest research about several university.