• 제목/요약/키워드: Identification scenario

검색결과 100건 처리시간 0.024초

선수동요 동유체마력 추정을 위한 시운전 (A Study on Sea Trial Test Scenario for Estimation of Hydrodynamic Rotary Derivatives)

  • 윤현규
    • 대한조선학회논문집
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    • 제43권1호
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    • pp.50-58
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    • 2006
  • Free running model tests gives us only maneuvering indices not hydrodynamic derivatives. For this reason, system identification method has been applied to the measured data to identify mathematical model describing hydrodynamic force. However It is difficult to obtain complete set of maneuvering derivatives because of strong correlation of sway velocity and yaw rate. Therefore, in this paper, we assumed that sway velocity related coefficients would be obtained by oblique towing test. and then proposed new procedure to estimate yaw related coefficients. To do this, correlation and regression analyses were carried out to establish modified model and estimate maneuvering derivatives. Also D-optimal rudder input scenario was found based on the modified model and confirmed the validity of its sufficient richness as a input scenario.

모듈화된 얼굴인식 시스템을 이용한 성능 시험에 관한 연구 (A Study on the Performance Evaluation based on Modular Face Recognition System)

  • 홍태화;문현준;신용녀;이동근;김재성
    • 전자공학회논문지SC
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    • 제42권4호
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    • pp.35-44
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    • 2005
  • 생체인식 기술 중 변별력과 활용성, 편리성이 뛰어난 얼굴인식 기술은 출입통제나 금융관련 업무 처리와 같이 보안관련 응용분야에서 필요성이 급속도로 요구되고 있다. 따라서 얼굴인식 알고리즘의 발전과 더불어 현 기술의 상태를 파악하고 발전 방향을 제시하기 위한 성능 시험 방법에 대한 연구 또한 중대한 이슈로 부각되고 있다. 본 연구에서는 얼굴인식 시스템의 성능 시험을 위한 프로토콜의 설계 기준을 제시하고 XM2VTS 데이터베이스를 사용하여 PCA를 기반으로 한 인식 시스템을 디자인하여 Identification 시나리오와 Verification 시나리오 상에서 성능 시험 결과를 제시한다.

Tag Anti-Collision Algorithms in Passive and Semi-passive RFID Systems -Part II : CHI Algorithm and Hybrid Q Algorithm by using Chebyshev's Inequality-

  • 범효;송인찬;장경희;신동범;이형섭
    • 한국통신학회논문지
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    • 제33권8A호
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    • pp.805-814
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    • 2008
  • Both EPCglobal Generation-2 (Gen2) for passive RFID systems and Intelleflex for semi-passive RFID systems use probabilistic slotted ALOHA with Q algorithm, which is a kind of dynamic framed slotted ALOHA (DFSA), as the tag anti-collision algorithm. A better tag anti-collision algorithm can reduce collisions so as to increase the efficiency of tag identification. In this paper, we introduce and analyze the estimation methods of the number of slots and tags for DFSA. To increase the efficiency of tag identification, we propose two new tag anti-collision algorithms, which are Chebyshev's inequality (CHI) algorithm and hybrid Q algorithm, and compare them with the conventional Q algorithm and adaptive adjustable framed Q (AAFQ) algorithm, which is mentioned in Part I. The simulation results show that AAFQ performs the best in Gen2 scenario. However, in Intelleflex scenario the proposed hybrid Q algorithm is the best. That is, hybrid Q provides the minimum identification time, shows the more consistent collision ratio, and maximizes throughput and system efficiency in Intelleflex scenario.

EPS 공정의 정량적 위험성 평가를 통한 안전의사결정에 관한 연구 (A Study on the EPS Process of Quantitative Risk Assessment for the Safety Decision Making)

  • 정재희;김형석;최광석;이영순
    • 한국안전학회지
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    • 제14권2호
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    • pp.62-69
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    • 1999
  • The quantitative risk assessment and consequence analysis by accident scenario in the process of EPS(Expendable Poly Stylene) reaction process are conducted. And the decision making process is studied followed by selecting various alternatives to safety management and facility improvement. The result are as follows; 1) The object of decision making through comprehensive risk assessment are the scenario which can cause four major accident, which are made by process analysis, work analysis and hazard identification. 2) Frequency analysis of ETA, FTA, HRA and consequence analysis of accident to each have been conducted. The each frequency values are yielded $9.2{\times}10_{-5}/yr$ to scenarios $1, 8.2{\times}10^{-4}/yr$ to scenario 2, $4.5{\times}10^{-6}/yr$ scenario 3 and $1.8{\times}10^{-7}/yr$ to scenario 4. The each scenarios have been conducted consequence analysis. 3) The calculated values have been obtained 4.00 to scenario 1, 3.25 to scenario 2, 2.43 to scenario 3 and 1.34 to scenario 4, as the weight value had been applied to the quantitative and normalized criteria of all components. As a risk criteria, scenario 1 have been selected, which is the most dangerous scenario as a result of ranking the scenario. 4) According to the importance of FTA and contribute to scenario 1, the cost-benefit values are yielded $8.05\times10^5[₩/yr]$ to final alternative(Al), $1.55{\times}10^5[₩/yr]$ to final alternative(A2) and $2.32{\times}10^5[₩/yr]$ to final alternative(A3). As a result of final alternative(Al) has been selected, which is the most optimized alternative.

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SECURITY FRAMEWORK FOR VANET: SURVEY AND EVALUATION

  • Felemban, Emad;Albogamind, Salem M.;Naseer, Atif;Sinky, Hassan H.
    • International Journal of Computer Science & Network Security
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    • 제21권8호
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    • pp.55-64
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    • 2021
  • In the last few years, the massive development in wireless networks, high internet speeds and improvement in car manufacturing has shifted research focus to Vehicular Ad-HOC Networks (VANETs). Consequently, many related frameworks are explored, and it is found that security is the primary issue for VANETs. Despite that, a small number of research studies have taken into consideration the identification of performance standards and parameters. In this paper, VANET security frameworks are explored, studied and analysed which resulted in the identification of a list of performance evaluation parameters. These parameters are defined and categorized based on the nature of parameter (security or general context). These parameters are identified to be used by future researchers to evaluate their proposed VANET security frameworks. The implementation paradigms of security frameworks are also identified, which revealed that almost all research studies used simulation for implementation and testing. The simulators used in the simulation processes are also analysed. The results of this study showed that most of the surveyed studies used NS-2 simulator with a percentage of 54.4%. The type of scenario (urban, highway, rural) is also evaluated and it is found that 50% studies used highway urban scenario in simulation.

Mutual Friendly Force Identification Protocol based on Hash-Chain for Personal Combat Systems

  • Lee, Jongkwan
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제14권9호
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    • pp.3858-3869
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    • 2020
  • In this paper, we propose a hash-chain based friendly force identification protocol for personal combatants equipped with a personal combat system in a tactical wireless network. It is imperative in military operations to effectively and quickly identify friendly forces. If the identification of friendly forces is not correct, this can cause friendly fire. In current ground operations, the identification of friendly forces by personal combatants is neither secure nor safe. To address this issue, the proposed protocol uses a hash-chain to determine if a detected person is friendly. Only friendly forces with the same materials that are assigned before they deploy can construct an initial hash-chain. Moreover, the hash-chain is changed at specific times. The performance of the proposed protocol is evaluated on the assumption that the secret key is leaked, which is the worst scenario in the security research field. We verify that the proposed protocol is secure for the various attack scenarios, such as message replay attack, fabrication attack, and Denial of Service attack.

DEVELOPMENT OF A FRAMEWORK FOR ASSESSING RADIATION SOURCE TERMS IN NUCLEAR POWER PLANTS

  • Jae, Moo-Sung;Park, Shane;Kang, Kyung-Min;Jeun, Gyoo-Dong
    • Journal of Radiation Protection and Research
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    • 제26권3호
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    • pp.197-201
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    • 2001
  • A risk analysis consists of a triplet, , where Si is the scenario identification; Pi is the probability of each scenario; and Xi is the consequences of each scenario. A new computing framework, OMAM (ORIGEN-MAAP4-MMCS), has been developed and applied for assessing the risk of a reference plant as well as radiation source terms using the concept of risk triplet. The result of this study using the OMAM framework presented in this paper, can contribute to producing domestic nuclear power plant's risk data base as well as to establishing severe accident management plans.

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데이터 품질관리 프레임워크와 비즈니스 시나리오 (The Data Quality Management Framework and it's Business Scenario)

  • 이창수;김선호
    • 한국전자거래학회지
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    • 제15권4호
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    • pp.79-99
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    • 2010
  • e-비즈니스의 활성화로 기업과 조직에서 이해당사자 간의 데이터 교환이 활발해 짐에 따라, 신뢰성 있는 데이터의 확보 및 관리가 시급한 과제로 떠오르고 있다. 이러한 문제를 해결하기 위해, 본 논문은 데이터의 품질을 체계적으로 관리할 수 있는 프레임워크를 시나리오와 함께 제시한다. 데이터 품질 관리 프레임워크는 데이터 품질 모니터링, 데이터 품질 개선, 데이터 활용의 3단계로 구분되어 있으며 각 단계마다 3개씩, 총 9개의 프로세스로 구성되어 있다. 각 프로세스에는 필요성, 기능, 역할, 프로세스간의 관계가 명시되어 있다. 또한, 본 프레임워크를 현장에 직접 적용할 수 있도록, e-비즈니스에서 많이 사용되는 상품식별 및 분류 코드체계의 사례를 이용하여 업무 시나리오를 제시하였다.

Human and organizational factors for multi-unit probabilistic safety assessment: Identification and characterization for the Korean case

  • Arigi, Awwal Mohammed;Kim, Gangmin;Park, Jooyoung;Kim, Jonghyun
    • Nuclear Engineering and Technology
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    • 제51권1호
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    • pp.104-115
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    • 2019
  • Since the Fukushima Daiichi accident, there has been an emphasis on the risk resulting from multi-unit accidents. Human reliability analysis (HRA) is one of the important issues in multi-unit probabilistic safety assessment (MUPSA). Hence, there is a need to properly identify all the human and organizational factors relevant to a multi-unit incident scenario in a nuclear power plant (NPP). This study identifies and categorizes the human and organizational factors relevant to a multi-unit incident scenario of NPPs based on a review of relevant literature. These factors are then analyzed to ascertain all possible unit-to-unit interactions that need to be considered in the multi-unit HRA and the pattern of interactions. The human and organizational factors are classified into five categories: organization, work device, task, performance shaping factors, and environmental factors. The identification and classification of these factors will significantly contribute to the development of adequate strategies and guidelines for managing multi-unit accidents. This study is a necessary initial step in developing an effective HRA method for multiple NPP units in a site.

Prestress and excitation force identification in a prestressed concrete box-girder bridge

  • Xiang, Ziru;Chan, Tommy H.T.;Thambiratnam, David P.;Nguyen, Andy
    • Computers and Concrete
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    • 제20권5호
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    • pp.617-625
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    • 2017
  • Prestress force identification (PFI) is crucial to maintain the safety of prestressed concrete bridges. A synergic identification method has been proposed recently by the authors that can determine the prestress force (PF) and the excitation force simultaneously in prestressed concrete beams with good accuracy. In this paper, the ability of this method in the application with prestressed concrete box-girder bridges is demonstrated. A reasonable assumption is made to capture the similarity of the dynamic behavior of the prestressed concrete box-girder bridge and a beam under a certain loading scenario, and the feasibility of this method for application in a prestressed box-girder bridge is affirmed. A comprehensive laboratory test program is conducted, and the effects of PF, excitation, measuring time and uncertainties are studied. Results show that the proposed method can predict the PF and the excitation force in a prestressed concrete box-girder accurately and has a great robustness against uncertainties.