• 한국건설관리학회논문집
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• 제5권4호
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• pp.79-86
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• 2004

One of the most difficult tasks in pavement management information systems is establishing the links between performance measures of a structure and the design and construction inputs. In-situ pavement performance can be considered a response variable to many project input variables, such as design, construction, and traffic loading effects. If we are to fully understand the component of pavement performance and specify the inputs through design and construction specifications to achieve that performance we must develop quantitative relationship between input and response variables through a scientific, fully integrated Pavement Performance Analysis System (PPAS). Hence, the objective of this study is to design a database model required for developing an effective database template that will allow analysis of pavement performance measures based on design and construction information linked by location. In order to select the most appropriate database model, a conceptual database model (Entity Relationship Model) and dimensional model, which is believed to be the most effective modeling technique for data warehouse project, are designed and compared. It is believed that other state highway agencies could adopt the proposed design strategy for implementing a PPAS at the discretion of the state highway agencies.

• 한국군사과학기술학회지
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• 제17권2호
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• pp.223-234
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• 2014

This paper proposes a flexible and highly reusable modeling methodology for a next-generation combat entity which enables joint analysis of performance/engagement effectiveness. According to the scope of the proposed work, the paper is divided into two parts; Part 1 focuses on a conceptual model design, whereas Part 2 proposes detailed model specification and implementation. In Part 1, we, first, classify the combat entity model as combat logic and battlefield function sub-models for joint analysis. Based on the sub-models, we propose two dimensional model partition method, which creates six groups of a single combat entity model by two dimensions: three-activity and two-abstraction. This grouping enables us to reconfigure the combat entity model by sharing the same interface within the group, and the same interface becomes the fundamental basis of the flexible model composition. Furthermore, the proposed method provides a model structure that effectively reflects the real world and maximizes the multi-level reusability of a combat entity model. As a case study, we construct a model design for anti-surface ship warfare. The case study proves enhancement of model reusability in the process of scenario expansion from pattern running to wire guided torpedo operations.

• 한국시뮬레이션학회논문지
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• 제4권1호
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• pp.1-11
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• 1995

The model of a FMS (Flexible Manufacturing System) admits to a natural hierarchical decomposition of highly decoupled units with similar structure and control. The FMS fractal architecture model represents a hierarchical structure built from elements of a single basic design. A SES (System Entity Structure) is a structural knowledge representation scheme that contains knowledge of decomposition, taxonomy, and coupling relationships of a system necessary to direct model synthesis. A substructure of a SES is extracted for use as the skeleton for a model. This substructure is called pruned SES and the extraction operation of a pruned SES from a SES is called pruning (or pruning operation). This paper presents a pruning operation called recursive pruning. It is applied to SES for generating a model structure whose sub-structure contains copies if itself as in FMS fractal architecture. Another pruning operation called delay pruning is also presented. Combined with recursive pruning the delay pruningis a useful tool for representing and constructing complex systems.

• 한국시뮬레이션학회논문지
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• 제22권4호
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• pp.109-118
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• 2013

전통적으로 신뢰도 분석에 사용되는 Fault Tree Analysis의 경우 관련 분야의 전문가가 필요하고 작성자의 판단에 따라 신뢰도 분석 결과가 달라진다. 반면, Reliability Block Diagram의 경우 시스템 구성도나 Process Flow Diagram (PFD), Piping and Instrument Diagram (P&ID)을 기반으로 하기에 작성에 필요한 비용과 시간이 절감되는 장점이 있다. 본 논문에서는 Dynamic Reliability Block Diagram과 이산 사건 시뮬레이션에 널리 사용되는 DEVS 형식론을 이용하는 신뢰도 분석 방법을 제안한다. 또한 시스템 모델링 방법론 중 하나인 System Entity Structure/Model Base의 개념을 도입함으로써 다양한 설계 대안에 대한 신뢰도 분석 모델을 자동으로 생성할 수 있도록 하였다. 그리고 Reliability Block Diagram을 이용한 신뢰도 분석 시 오래 소요되는 계산 시간을 단축시키기 위해 GPU 가속 기술을 신뢰도 분석 시뮬레이션에 접목하였다.

• 인터넷정보학회논문지
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• 제11권4호
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• pp.143-158
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• 2010

기업의 전자기밀유출은 생존을 위협하는 피해를 입힌다. 중소기업은 유출사실을 알아도 적절히 대응하지 못하는 현실에서 추적 불가능한 유출을 원천봉쇄하는 전자기밀보호 시스템으로만 전자기밀정보는 보호된다. 현재 DRM 기반 문서보호 시스템은 전자기밀 보호에 여러 보안 취약점을 보인다. 본 논문은 전자기밀정보의 불법유출 경로 및 취약점을 분석하여, 가장 위험한 내부자 유출시도조차 불가능하게 하는 보안조건을 만족시키면서도 성능저하가 없는 그룹통신 기반 시스템의 구조를 연구하였다. 구조의 핵심은 암호화 상태로 유통, 암호키와 기밀정보파일의 분리원칙, 다중 엔티티(entity)의 DSA 기반 다중 인증기법으로 간단한 정보도용으로는 기밀정보를 얻을 수 없는 시스템의 기본 구조의 설계를 논의한다.

• 한국시뮬레이션학회논문지
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• 제18권1호
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• pp.27-34
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• 2009

현재 네트워크 사용자 특히 인터넷 사용자 증가 속도는 가히 기하급수적이라 할 수 있다. 더불어 질 높은 서비스에 대한 요구가 제기되고 있는데 이것은 필연적으로 트래픽의 폭증을 가져오고 있다. 따라서 네트워크 트래픽의 효율적 분석 관리는 과거에 비해 더욱 중요한 사항으로 대두되고 있다. SES를 이용한 네트워크 분석은 네트워크 관리자들에게 쉽고, 효율적으로 트래픽데이터를 접근이 가능하다. 따라서 본 연구의 목적은 대용량의 네트워크 트래픽 데이터 효과적으로 처리하기 위해 최적화된 네트워크 트래픽 시스템을 구현하기 위하여 데이터 엔지니어링 방법론인 SES를 이용하여 네트워크 패킷의 정보 구조를 설계한후 DEVS를 이용하여 분석하는 시스템을 구현하고자 한다.

• 한국국방경영분석학회지
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• 제17권2호
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• pp.100-112
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• 1991

Software system is a hierarchical structure with collection of program units. Software system can import external packages globally or locally depending on the usage within a system. If the imported package is used globally, the soft-ware system can be influenced globally by any change of package and programmer's debugging time for the program maintenance will be greater. To solve these problems, it is desirable to use the imported package locally right on the usage point within the system. The model presented in this paper analyzed entity usage of package in structure of program, identified the usage level to obtain localization and provided information for restructure of the program to localize package usage. To obtain localization, it identified declared entities inside the imported package and analyzed the specification and body part of program unit to identify entities referenced from the imported package. The proposed model can be used to improve the maintainability of software system and contributed to reduction of programmer's debugging time in program maintenance.

• International Journal of Safety
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• 제4권2호
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• pp.12-17
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• 2005

This paper aims at the development of an knowledge base for an electrical fire cause diagnosis system using the entity relation database. The relation database which provides a very simple but powerful way of representing data is widely used. The system focused on database construction and cause diagnosis can diagnose the causes of electrical fires easily and efficiently. In order to store and access to the information concerned with electrical fires, the key index items which identify electrical fires uniquely are derived out. The knowledge base consists of a case base which contains information from the past fires and a rule base with rules from expertise. To implement the knowledge base, Access 2000, one of DB development tools under windows environment and Visual Basic 6.0 are used as a DB building tool. For the reasoning technique, a mixed reasoning approach of a case based inference and a rule based inference has been adopted. Knowledge-based reasoning could present the cause of a newly occurred fire to be diagnosed by searching the knowledge base for reasonable matching. The knowledge-based database has not only searching functions with multiple attributes by using the collected various information(such as fire evidence, structure, and weather of a fire scene), but also more improved diagnosis functions which can be easily wed for the electrical fire cause diagnosis system.

• 한국농촌건축학회논문집
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• 제23권4호
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• pp.55-62
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• 2021

This study conducted a management system and business analysis related to urban and architecture in local small and medium cities. The current status of the management department of the master plans, which were established based on the laws related to the spatial environment and implemented projects based on them, was analyzed, and the problems were derived. The basic urban master plan of the local government is classified as a hierarchical higher plan than other plans established within the same city, but there was a problem in that the timing of each plan was different. As a problem, the contents of the sub-plan were not included in the upper plan, or the opposite phenomenon occurred. In addition, the management entity of the master plan and sub-projects was different. To solve this problem, it is necessary to form a consistent structure of systematic planning and management subjects. In addition, in the future planning stage, it is necessary to establish a master plan establishment system according to hierarchies. This study is meaningful in that it can be used to establish a master plan establishment system according to hierarchy in the future planning stage and to establish the same management entity as the master plan in the projects stage.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2004년도 춘계학술대회 논문집
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• pp.13-19
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• 2004

본 논문은 SIMVA(Simulation Vulnerability Analyzer)를 이용한 시뮬레이션 기반의 네트워크 취약성 분석을 주목적으로 한다 SIMVA는 네트워크 상태를 감시하고, 이를 토대로 취약성을 분석하기 위하여 개발된 S/W로서, SES/MB (System Entity Structure / Model Base) 프레임워크 및 DEVS(Discrete Event System Specification) 이론을 적용하여 네트워크 보안 모델링을 수행할 수 있으며, 취약성 메트릭스를 통하여 정량적으로 취약성을 분석할 수 있다. 본 연구에서는 SIMVA를 이용하여 최근 네트워크 보안 문제에 심각한 영향을 미치는 슬래머 웜 공격 시나리오에 대한 취약성 분석을 수행함으로써 SIMVA의 검증 및 적용 가능성을 제시한다.