• 제목/요약/키워드: Korean integrated model

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철도 시스템 개발에서 시스템공학 프로세스와 안전성 평가를 동시에 고려한 통합 프로세스에 관한 연구 (A Study on Integrated SE Process for the Development of the Railway Systems with Safety Assessment Included)

  • 윤재한;이재천;홍선호
    • 한국철도학회논문집
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    • 제10권4호
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    • pp.438-443
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    • 2007
  • This paper proposes an integrated SE process for the development of railway systems with safety assessment included. Although the safety assessment process must be performed with SE process properly with good coordination, the interfaces between the two processes have not been clear. Thus, in many of safety critical system developments in Korea, it is difficult to assess safety in proper development phase. The process model proposed in this paper is based on both the concept of system life cycle and the repetitive use of SE process. In each of development phases, appropriate safety assessment methods are described. Also the evaluation of the integrated system incorporating safety factors is described. The resultant process model is expressed by the Enhanced Functional Flow Block Diagram (EFFBD) using a CASE tool. The model also allows timeline analysis for identifying activity flow and data flow, resulting in the effective management of process. In conclusion, the integrated process enable both the SE process and safety assessment process to cooperate with each other from early development phase throughout the whole system life cycle.

Performance Analysis of IEEE 802.15.6 MAC Protocol in Beacon Mode with Superframes

  • Li, Changle;Geng, Xiaoyan;Yuan, Jingjing;Sun, Tingting
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제7권5호
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    • pp.1108-1130
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    • 2013
  • Wireless Body Area Networks (WBANs) are becoming increasingly important to solve the issue of health care. IEEE 802.15.6 is a wireless communication standard for WBANs, aiming to provide a real-time and continuous monitoring. In this paper, we present our development of a modified Markov Chain model and a backoff model, in which most features such as user priorities, contention windows, modulation and coding schemes (MCSs), and frozen states are taken into account. Then we calculate the normalized throughput and average access delay of IEEE 802.15.6 networks under saturation and ideal channel conditions. We make an evaluation of network performances by comparing with IEEE 802.15.4 and the results validate that IEEE 802.15.6 networks can provide high quality of service (QoS) for nodes with high priorities.

네트워크 기반 엔지니어링 환경에서의 제품 개발: 개넘과 접근방식 (Product Development in the Network-Centric Engineering Environment: Concept and Approach)

  • 방건동
    • 한국CDE학회논문집
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    • 제5권1호
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    • pp.79-87
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    • 2000
  • This paper presents an integrated but open product development environment for distributed and collaborative design. The web-based framework, called DOME, allows designers to build integrated models using both local and distributed resources, and to collaborate by exchanging services in a network-centric product development environment. Thus, an integrated model can be created while each participant focuses on his or her own area of expertise. A design problem model is created by connecting modules, which represent specific system components, analysis capabilities/software, disciplines, or organizations relevant to the problem. The modules interact with each other using service exchanges based upon the CORBA standard communication protocol. The goal of this framework is tall provide the ability to rapidly construct integrated design problem models to facilitate collaborative design work, improve product quality and reduce development time. Ultimately, it should allow specialized engineering applications and design problem models to operate under a common design environment.

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통합수문모형을 이용한 제주 한천유역의 지하수 변동 특성 모의 (Simulation of Groundwater Variation Characteristics of Hancheon Watershed in Jeju Island using Integrated Hydrologic Modeling)

  • 김남원;나한나;정일문
    • 한국환경과학회지
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    • 제22권5호
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    • pp.515-522
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    • 2013
  • To investigate groundwater variation characteristics in the Hancheon watershed, Jeju Island, an integrated hydrologic component analysis was carried out. For this purpose, SWAT-MODFLOW which is an integrated surface-groundwater model was applied to the watershed for continuous watershed hydrologic analysis as well as groundwater modeling. First, ephemeral stream characteristics of Hancheon watershed can be clearly simulated which is unlikely to be shown by a general watershed hydrologic model. Second, the temporally varied groundwater recharge can be properly obtained from SWAT and then spatially distributed groundwater recharge can be made by MODFLOW. Finally, the groundwater level variation was simulated with distributed groundwater pumping data. Since accurate recharge as well as abstraction can be reflected into the groundwater modeling, more realistic hydrologic component analysis and groundwater modeling could be possible.

Model Inversion Attack: Analysis under Gray-box Scenario on Deep Learning based Face Recognition System

  • Khosravy, Mahdi;Nakamura, Kazuaki;Hirose, Yuki;Nitta, Naoko;Babaguchi, Noboru
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제15권3호
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    • pp.1100-1118
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    • 2021
  • In a wide range of ML applications, the training data contains privacy-sensitive information that should be kept secure. Training the ML systems by privacy-sensitive data makes the ML model inherent to the data. As the structure of the model has been fine-tuned by training data, the model can be abused for accessing the data by the estimation in a reverse process called model inversion attack (MIA). Although, MIA has been applied to shallow neural network models of recognizers in literature and its threat in privacy violation has been approved, in the case of a deep learning (DL) model, its efficiency was under question. It was due to the complexity of a DL model structure, big number of DL model parameters, the huge size of training data, big number of registered users to a DL model and thereof big number of class labels. This research work first analyses the possibility of MIA on a deep learning model of a recognition system, namely a face recognizer. Second, despite the conventional MIA under the white box scenario of having partial access to the users' non-sensitive information in addition to the model structure, the MIA is implemented on a deep face recognition system by just having the model structure and parameters but not any user information. In this aspect, it is under a semi-white box scenario or in other words a gray-box scenario. The experimental results in targeting five registered users of a CNN-based face recognition system approve the possibility of regeneration of users' face images even for a deep model by MIA under a gray box scenario. Although, for some images the evaluation recognition score is low and the generated images are not easily recognizable, but for some other images the score is high and facial features of the targeted identities are observable. The objective and subjective evaluations demonstrate that privacy cyber-attack by MIA on a deep recognition system not only is feasible but also is a serious threat with increasing alert state in the future as there is considerable potential for integration more advanced ML techniques to MIA.

내공생 진화알고리듬을 이용한 혼합모델 조립라인의 작업할당과 투입순서 결정 (Balancing and Sequencing in Mixed Model Assembly Lines Using an Endosymbiotic Evolutionary Algorithm)

  • 김여근;손성호
    • 한국경영과학회지
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    • 제26권4호
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    • pp.109-124
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    • 2001
  • This paper presents a new method that can efficiently solve the integrated problem of line balancing and model sequencing in mixed model assembly lines (MMALs). Line balancing and model sequencing are important for an efficient use of MMALs. The two problems of balancing and sequencing MMALs are tightly related with each other. However, In almost all the existing researches on mixed-model production lines, the two problems have been considered separately. In this research, an endosymbiotic evolutionary a1gorithm, which is a kind of coevolutionary a1gorithm, is adopted as a methodology in order to solve the two problems simultaneously. This paper shows how to apply an endosymbiotic evolutionary a1gorithm to solving the integrated problem. Some evolutionary schemes are used In the a1gorithm to promote population diversity and search efficiency. The proposed a1gorithm is compared with the existing evolutionary algorithms in terms of solution quality and convergence speed. The experimental results confirm the effectiveness of our approach.

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Research on Forecasting Framework for System Marginal Price based on Deep Recurrent Neural Networks and Statistical Analysis Models

  • Kim, Taehyun;Lee, Yoonjae;Hwangbo, Soonho
    • 청정기술
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    • 제28권2호
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    • pp.138-146
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    • 2022
  • Electricity has become a factor that dramatically affects the market economy. The day-ahead system marginal price determines electricity prices, and system marginal price forecasting is critical in maintaining energy management systems. There have been several studies using mathematics and machine learning models to forecast the system marginal price, but few studies have been conducted to develop, compare, and analyze various machine learning and deep learning models based on a data-driven framework. Therefore, in this study, different machine learning algorithms (i.e., autoregressive-based models such as the autoregressive integrated moving average model) and deep learning networks (i.e., recurrent neural network-based models such as the long short-term memory and gated recurrent unit model) are considered and integrated evaluation metrics including a forecasting test and information criteria are proposed to discern the optimal forecasting model. A case study of South Korea using long-term time-series system marginal price data from 2016 to 2021 was applied to the developed framework. The results of the study indicate that the autoregressive integrated moving average model (R-squared score: 0.97) and the gated recurrent unit model (R-squared score: 0.94) are appropriate for system marginal price forecasting. This study is expected to contribute significantly to energy management systems and the suggested framework can be explicitly applied for renewable energy networks.

통합적 농촌경관 평가모델 개발 및 적용 - 전북 고창선동권역을 대상으로 - (Developing Rural Landscape Evaluation Model and Its Application to Gochang-Seondong Region, Korea)

  • 반영운;이영훈;김민아;최나래;백종인
    • 농촌계획
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    • 제20권4호
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    • pp.25-33
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    • 2014
  • This study has intended to build a rural landscape evaluation model based on an integrated landscape assessment paradigm of rural region using an additive integration index method and applied the model to the Seondong Region of Gochang-gun, Jeollabuk-do, Korea. To reach this goal, this study developed a model to calculate Integrated Landscape Assessment Index. The model has employed the Objective Landscape Index, the Subjective Landscape Index, and the weighted values, and was applied to the Seondong region. This study has found the following results: 1) forests and water spaces were assessed with relatively better visual preferences and better landscape ecosystem; 2) the historic cultural area and scenic agriculture as well as general farm land were assessed with moderate ratings; and, 3) the villages included in development plan, their adjacent arable farming land, and the village watercourses were forming relatively poorer landscape.

Parameterized Simulation Program with Integrated Circuit Emphasis Modeling of Two-level Microbolometer

  • Han, Seung-Oh;Chun, Chang-Hwan;Han, Chang-Suk;Park, Seung-Man
    • Journal of Electrical Engineering and Technology
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    • 제6권2호
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    • pp.270-274
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    • 2011
  • This paper presents a parameterized simulation program with integrated circuit emphasis (SPICE) model of a two-level microbolometer based on negative-temperature-coefficient thin films, such as vanadium oxide or amorphous silicon. The proposed modeling begins from the electric-thermal analogy and is realized on the SPICE modeling environment. The model consists of parametric components whose parameters are material properties and physical dimensions, and can be used for the fast design study, as well as for the co-design with the readout integrated circuit. The developed model was verified by comparing the obtained results with those from finite element method simulations for three design cases. The thermal conductance and the thermal capacity, key performance parameters of a microbolometer, showed the average difference of only 4.77% and 8.65%, respectively.

통합 접근 제어를 위한 시뮬레이션 모델 설계 (Design of a Simulation Model for Integrated Access Control)

  • 이호
    • 한국컴퓨터정보학회논문지
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    • 제9권4호
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    • pp.49-54
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    • 2004
  • 규칙 기반 접근 제어가 신분 기반 접근 제어의 완전한 대체 방법이 아니듯이 직무 기반 접근 제어도 신분 기반 접근 제어와 규칙 기반 접근 제어의 병합이 아닌 상호 보완적인 방법이다. 본 논문에서는 기존의 접근 제어 메커니즘을 통합하여 보안성 무결성 및 흐름 제어 보안 기능을 제공하며 직무 중심 조직의 접근 제어 요구를 용이하게 수용할 수 있는 새로운 방식의 통합 접근 제어를 위한 시뮬레이션 모델을 설계하여 이를 실제의 응용 시스템에 적용할 수 있도록 한다.

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