• Title, Summary, Keyword: TRA

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An Experimental Study of Engine Mount Optimization to Improve Noise and Vibration Quality of F.R. Vehicle (후륜구동 차량의 소음 진동 성능향상을 위한 엔진마운트 최적설계에 관한 실험적 연구)

  • 이준용;김찬묵
    • Journal of KSNVE
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    • v.7 no.4
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    • pp.681-688
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    • 1997
  • The purpose of engine mount system is to reduce the noise and vibration caused by engine vibration, and to decouple the roll and bounce mode at idle. To reduce the noise and vibration level in a vehicle, it is important to make the design optimization of engine mount system that consider the moment of inertia and inclination of mount rubber. As a result, according to the definition of Torque Roll Axis (TRA), the vibration axis at idle must be on the TRA or very close to it. In this paper, we studied the effect of the design optimization of engine mount system. And we have achieved good improvements in noise and vibration quality of F.R. vehicle.

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An Analysis of the Applicability of Technical Risk Index in the Weapons System Research & Development Projects (무기체계 연구개발사업에서 기술적 위험지표 적용 가능성 분석)

  • Lee, Sunhun;Kim, Minjun
    • Journal of the Korea Institute of Military Science and Technology
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    • v.20 no.6
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    • pp.835-843
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    • 2017
  • The Technology Readiness Assessment(TRA) has the advantage of identifying immature technologies in promoting weapon system research and development project. However, a more diverse set of information is required for the determination of phase shift and technical risk management for weapons system R&D projects. In this paper, we investigate the various indexes the various indexes proposed to overcome the limitations of the Technology Readiness Level(TRL) and analyze the possibility of applying to the actual weapons system R&D projects. Based on the analysis, it was possible to provide additional information that could not be presented in TRA using technical risk indexes other than TRL, confirming that it could be used for technical risk management for weapons system R&D projects.

Mitigating Threats and Security Metrics in Cloud Computing

  • Kar, Jayaprakash;Mishra, Manoj Ranjan
    • Journal of Information Processing Systems
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    • v.12 no.2
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    • pp.226-233
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    • 2016
  • Cloud computing is a distributed computing model that has lot of drawbacks and faces difficulties. Many new innovative and emerging techniques take advantage of its features. In this paper, we explore the security threats to and Risk Assessments for cloud computing, attack mitigation frameworks, and the risk-based dynamic access control for cloud computing. Common security threats to cloud computing have been explored and these threats are addressed through acceptable measures via governance and effective risk management using a tailored Security Risk Approach. Most existing Threat and Risk Assessment (TRA) schemes for cloud services use a converse thinking approach to develop theoretical solutions for minimizing the risk of security breaches at a minimal cost. In our study, we propose an improved Attack-Defense Tree mechanism designated as iADTree, for solving the TRA problem in cloud computing environments.

Mapping 2D Midship Section into 3D Structural Models based on STEP AP218 (STEP AP218 방법에 따른 중앙단면 2차원 정보의 3차원 구조 모델로 매핑)

  • Ho-Jin Hwang;Soon-Hung Han
    • Journal of the Society of Naval Architects of Korea
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    • v.38 no.4
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    • pp.56-65
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    • 2001
  • The structural model of midship section is within the scope of STEP AP218. It supports to represent the ship structure, but most of shipyards and classification societies exchange the information using 2D drawings at the present. To translate the 2D information into the ship structure model of STEP AP218, we analyze the 2D midship section information of KR-TRAS of Korean Register of shipping, and include the transverse members information with the 3D model. We also define the mapping table and the mapping relationships between two data structures. With this mapping table we develop the translator for the midship section, and visualize the translated ship structure model using a STEP viewer. The ship structure model can be used to exchange information between design departments, and through the lifecycle of design, analysis, and maintenance.

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Design and Implementation of a Web-based Traffic Monitoring and Analysis System (웹 기반의 트래픽 모니터링 및 분석 시스템의 설계와 구현)

  • 이명섭;박창현
    • Journal of KIISE:Information Networking
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    • v.29 no.6
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    • pp.613-624
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    • 2002
  • Within the past decade, TCP/IP network environment has been explosively widespread all over the world. As the internet and the WWW expand their boundaries, the network traffic caused by data transfers over the internet has also increased. In this paper, we present the design and implementation of a WebTraMAS (Web-based Traffic Monitoring and Analysis System) which can resolve the shortcomings of current management approaches, particularly on the network traffic monitoring and analysis. The WebTraMAS presented in this paper performs the network management activities based on the parameters related to the MIB-II of SNMP and the parameters related to the QoS such as network performance and fault. The proposed WebTraMAS, implemented using the WWW technology, is able for the network manager to manage the network easily and platform independently with the performance analysis of internet traffic.

Characterization of Xanthomonas axonopodis pv. glycines plasmids

  • Park, Sejung;Kim, Jung-Gun;Ingyu Hwang
    • Proceedings of the Korean Society of Plant Pathology Conference
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    • pp.135.2-136
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    • 2003
  • To characterize plasmids in Xanthomonu axonopodis pv. glycines, we isolated plasmids pAG1 from the strain AG1 and pXAG81 and PXAG82 from the strain Bra, respectively, and sequenced three plasmids. The size of plasmids, pAG1, pXAG81, and pXAG82 was 15,149-base pairs (bp), 26,727-bp, and 1,496-bp, respectively Fifteen and twenty six possible open reading frames (ORFs) were present in pAG1 and pXAG81, respectively. Only one ORF homologous to a rep gene of Xylella fastidiosa was present in pXAG82. pAG1 contained genes homologous to avrBs3, tnpA, tnpR, repA, htrA, three parA genes, M.XmaI, R.XmaI, and six hypothetical proteins. pXAG81 contained genes homologous to avrBs3, tnpA, tnpR, repA, htrA, two parA genes, pemI, pemK, mobA, mobB, mobC, mobD, mobE, trwB, traF, traH, ISxac2, and eleven hypothetical proteins. Based on DNA sequence analysis, we presume that pXAG81 is a conjugal plasmid. Interestingly, we found 0.5-kb truncated avirulence gene similar to aurXacE3 on the right border of avrBs3 homolgs of pAG1 and pXAG81. Two hundred twenty five isolates were analyzed to find aurBS3 or tra gene homologs by Southern hybridization. The numbers of avrBs3 homolog varied from 3 in AG1 to 8 in AG166. Two hundred seventeen isolates appeared to can conjugative plasmids (pXAG81 type), and thirty eight isolates appeared to carry non-conjugative plamids (pAGl type). This indicated that aurBs3 gene homologs might be spread by conjugation in X. axonopodis pv. glycines.

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Development of Inhibitors against TraR Quorum-Sensing System in Agrobacterium tumefaciens by Molecular Modeling of the Ligand-Receptor Interaction

  • Kim, Cheoljin;Kim, Jaeeun;Park, Hyung-Yeon;Park, Hee-Jin;Kim, Chan Kyung;Yoon, Jeyong;Lee, Joon-Hee
    • Molecules and Cells
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    • v.28 no.5
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    • pp.447-453
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    • 2009
  • The quorum sensing (QS) inhibitors that antagonize TraR, a receptor protein for N-3-oxo-octanoyl-L-homoserine lactones (3-oxo-C8-HSL), a QS signal of Agrobacterium tumefaciens were developed. The structural analogues of 3-oxo-C8-HSL were designed by in silico molecular modeling using SYBYL packages, and synthesized by the solid phase organic synthesis (SPOS) method, where the carboxamide bond of 3-oxo-C8-HSL was replaced with a nicotinamide or a sulfonamide bond to make derivatives of N-nicotinyl-L-homoserine lactones or N-sulfonyl-L-homoserine lactones. The in vivo inhibitory activities of these compounds against QS signaling were assayed using reporter systems and compared with the estimated binding energies from the modeling study. This comparison showed fairly good correlation, suggesting that the in silico interpretation of ligand-receptor structures can be a valuable tool for the pre-design of better competitive inhibitors. In addition, these inhibitors also showed anti-biofilm activities against Pseudomonas aeruginosa.

A Study on the Risk Assessment by Comparing Workplace Environment Measurement with Exposure Assessment Program(ECETOC TRA) (작업환경측정과 노출평가 프로그램(ECETOC TRA) 비교에 따른 위해성 평가에 관한 연구)

  • Ko, Won-Kyoung;Yi, Young-Seop
    • Journal of the Korea Safety Management and Science
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    • v.15 no.3
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    • pp.1-6
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    • 2013
  • This study was conducted to compare the value of the working environment measurement with the expected exposure value drawn by using a program, thereby going to investigate whether it is available to the risk assessment of domestic workplace. We used the ECETOC TRA program which is one of the exposure predictive models. Four kinds of substances were measured in two workplace which was exposed to organic solvents and one kind of substance was measured in three workplace which was exposed to dusts and then an exposure assessment of chemical risk factors was conducted. The result value of the working environment measurement, solid substance exceeded standard in one site, and it was found that the other solid and liquid substances were within the standard. The value of the exposure assessment program showd the same result; it was higher than the value of the working environment measurement, suggesting that due to its nature, the exposure assessment program is run only on the worst situation. Therefore, it was found that when the exposure assesment program is used, variables should be substituted only after accurately assessing the workplace and it is a good idea to assess the risk beforehand with the exposure assessment program in the case of the workplace which employs no more than 5 people and where it is hard to assess the working environment.

Application of TRA in u-health system focusing on moderating effect of health privacy information (유헬스 시스템에 대한 TRA의 적용에 관한 연구: 건강개인정보의 조절 효과를 중심으로)

  • Kim, Mincheol;Yang, Young-Bae;Ha, Tai-Hyun
    • Journal of Digital Contents Society
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    • v.17 no.6
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    • pp.537-543
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    • 2016
  • The purpose of this study is to analyze the moderating effect of health privacy information on the relationship between the factors that affect the behavioral intention of the usage of u-health system have. Therefore, as a research hypothesis in TRA (Theory of Reasoned Action), self-efficacy and perceived usefulness will have a positive effect on the behavioral intention of the u-health system, and in the path, that personal information factors have an effect on each path. This study used the PLS-SEM methodology to verify the proposed research model. As a result of the analysis, this study showed that the moderating effect of health personal information in the presented model affects to some extent by the increase of R2 explanatory power. However, it was found that it was more consistent with the role of the independent variable rather than the moderating influence on the perceived usefulness.