• Proceedings of the Korean Information Science Society Conference
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• 2003.04a
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• pp.449-451
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• 2003

인터넷 인구의 확산과 개방된 시스템 환경속에서 네트웍과 시스템에 대한 침해사고 건수가 날로 증가하고 있는 가운데 최근 국내 인터넷망 대부분이 다운되는 등 그 피해 규모도 점차 막대해지고 있다. 이에 따라 침해 사고에 대해 사고 발생 즉시 민첩하게 대응하여 피해를 최소화하고, 더 나아가서는 사고를 미연에 방지하기 위한 보안 관련 시스템들에 관한 연구가 활발히 진행되고 있다. 본 연구에서는 보안관련 솔루션 중에 하나인 침입탐지시스템(IDS: Intrusion Detection System)에 대해 살펴보고, IDS의 탐지방식 중 비정상탐지(Anomaly Detection)분야에 은닉 마르코프 모델(HMM: Hidden Markov Model)을 적용하여 사용자별로 명령어 사용 패턴을 프로파일링하는 HMM 기반 비정상 침입탐지 시스템을 제안하고자 한다. 실험결과 자신의 데이터에 대해서는 평균 93% 이상의 만족할만한 탐지 정확도를 보였고, 다른 사용자의 데이터에 대해서는 모델마다 다소 차이를 나타냈다.

• Journal of Digital Convergence
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• v.14 no.10
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• pp.159-166
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• 2016

Recent public information project, which has been organized mainly to large companies is a situation that is being reorganized to small and medium-sized systems integration company. However, many of the small and medium-sized companies lack knowledge of the systematic risk management. Thus, in connection with the revenue, it involves a number of problems. Therefore, in this paper, we present a risk element that occurs mainly in the field of the project, providing a model for measuring the risk element by risk level costs associated with this. Through the convergence, we aim at providing a management system that is able to make the project successfully accomplished, predicting the risk that occurs in advance to pursue the project; Based on the proposed model, it is possible to secure a proper size of reserve fund so it is expected to enable companies to ensure the cost of risk analysis.

• Journal of Digital Convergence
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• v.14 no.11
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• pp.233-240
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• 2016

Information system development projects, have a mechanism for many of the costs generated by a variety of risk factors. In general, the probability that the software project of the information system is carried out successfully in the delivery time is very low. This prediction of a formal cost is needed as the most important factor since it can prevent the project from being failed. However, objectivity of most of the project scale calculation during the calculation criteria is insufficient. Further, it is the actual situation that the management of the base line is not properly made during the project. Therefore, in this paper, we propose a model to calculate the number of steps it takes to develop on the basis of a methodology in an attempt to overcome the limitation of being unpractical in the early stage of the information system development project. It is expected to be a tool to estimate the effort and cost required by the information system development business through these convergence proposals model.

• Journal of the Korea Society of Computer and Information
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• v.11 no.3
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• pp.281-289
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• 2006

Even though software developing environment has been changing to Web basis very fast, there are just few studies of quality metric or estimation model for Web software. In this study after analyzing the correlation between the risk level and property of objects using linear regression, six middle sized industrial system has been used to propose the correlation model of size and Number of Classes(NOC), size and Number of Methods(NOM), complexity and NOC, and complexity and NOM. Among of six systems 5 systems(except S06) have high correlation between size(LOC) and NOM, and four systems(except S04 & S06) have high correlation between complexity and NOC / NOM. As Web software architecture with three sides of Server, Client and HTML, complexity of each sides has been compared, two system(S04, S06) has big differences of each sides compleity values and one system(S06) has very higher complexity value of HTML, So the risk level could be estimated through NOM to improve maintenance in case of that the system has no big differences of each sides complexity.

• The Journal of the Korea Contents Association
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• v.21 no.5
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• pp.581-591
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• 2021

This study aims to understand the community sense and need for community programs for large scale cooperative rental housing residents, and to set the direction of the construction plan. To this end, a survey was conducted on visitors and contractors of the model house in Westaybyeolnae. As a result of the analysis, the most visitors to the model house were in their 20s and 30s, while the number of contractors in their 30s was the most. Most of the model house visitors currently do not participate in community activities, but the contractors wanted to interact with neighbors about once a week. The contractors had high demands for sports facilities and child-rearing facilities, and the most demanded for living cooperatives and child care services. However, the range of neighbors required by age, the degree of meeting, common facilities and programs required were different.

• Annual Conference on Human and Language Technology
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• 2023.10a
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• pp.683-689
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• 2023

자연어 처리 분야는 최근에 큰 발전을 보였으며, 특히 초대규모 언어 모델의 등장은 이 분야에 큰 영향을 미쳤다. GPT와 같은 모델은 다양한 NLP 작업에서 높은 성능을 보이고 있으며, 특히 챗봇 분야에서 중요하게 다루어지고 있다. 하지만, 이러한 모델에도 여러 한계와 문제점이 있으며, 그 중 하나는 모델이 기대하지 않은 결과를 생성하는 것이다. 이를 해결하기 위한 다양한 방법 중, Retrieval-Augmented Generation(RAG) 방법이 주목받았다. 이 논문에서는 지식베이스와의 통합을 통한 도메인 특화형 질의응답 시스템의 효율성 개선 방안과 벡터 데이터 베이스의 수정을 통한 챗봇 답변 수정 및 업데이트 방안을 제안한다. 본 논문의 주요 기여는 다음과 같다: 1) QA Pair Passage RAG을 활용한 새로운 RAG 시스템 제안 및 성능 향상 분석 2) 기존의 LLM 및 RAG 시스템의 성능 측정 및 한계점 제시 3) RDBMS 기반의 벡터 검색 및 업데이트를 활용한 챗봇 제어 방법론 제안

• The Journal of Engineering Geology
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• v.8 no.2
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• pp.99-114
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• 1998

The Yangsan fault system of Kyungsang Basin in the southeastern part of Korean peninsula is one of the most important structures in the peninsula. A number of strong earthquakes occurred in the vicinity of the fault. It was suggested that this fault can be divided into three segments: northern, central and southern ones. Earthquake data around the Yangsan fault were classified into two groups as incomplete and complete ones; the former is the data before the Choseon Dynasty and the latter is those since the dynasty. The maximum likelihood method was applied to compute seismicity parameters such as earthquake occurrence rates, b-values of frequency-magnitude relation and maximum possible magnitudes for each segment and the entire fault. These parameters show considerably different values from segment to segment. The b-value for the entire fault turned out to be 0.85 and maximum possible magnitudes for the northern, central and southern segments are 5.2, 6.8 and 6.0, respectively. The mean return periods for the maximum possible magnitudes for each segments are greater than 1000 years. In addition, according to the analysis of the frequency-magnitude relation, the occurrence pattern of earthquakes around the Yangsan fault show more similarity to the characteristic earthquake model than the Gutenberg-Richter model. The data for each segments are, however, too scarce to obtain any physically meaningful results.

• Atmosphere
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• v.31 no.2
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• pp.241-249
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• 2021

A smart city utilizes data collected from various sensors through the internet of things (IoT) and improves city operations across the urban area. Recently substantial research is underway to examine all aspects of data that requires for the smart city operation. Atmospheric data are an essential component for successful smart city implementation, including Urban Air Mobility (UAM), infrastructure planning, safety and convenience, and traffic management. Unfortunately, the current level of conventional atmospheric data does not meet the needs of the new city concept. New and innovative approaches to developing high spatiotemporal resolution of observational and modeling data, resolving the complex urban structure, are expected to support the future needs. The geographic information system (GIS) integrates the atmospheric data with the urban structure and offers information system enhancement. In this study we proposed the necessity and applicability of the high resolution urban meteorological dataset based on heavy fog cases in the smart city region (e.g., Sejong and Pusan) in Korea.

• Proceedings of the Korean Information Science Society Conference
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• 2007.06b
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• pp.513-518
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• 2007

시뮬레이션 방법론에 있어서 모델기반 시뮬레이션과 프로세스기반 시뮬레이션으로 나눌 수 있는데, 재사용성, 확장성, 시뮬레이터 기술 용이성 등의 장점으로 모델기반 시뮬레이션이 많이 사용되고 있다. 이러한 이유로 근래에는 컴퓨터 시스템, 항공, 자동차 등에서 모델 기반 시뮬레이션 방법이 사용되고 있다. 모델기반 시뮬레이션 방법으로 수학적 이론을 기반으로 모델을 정의하는 DEVS(Discrete Event System Specification) 형식론은 계층적이고 모듈화 된 형태로 이산사건 시스템을 기술한다. 대규모의 복잡한 시뮬레이션 모델을 검증 할 목적으로 분산 시뮬레이션 방법론이 있는데, 이들은 크게 동기적인 방법과 비동기적인 방법이 있다. 동기적 방식보다 빠른 수행을 위해 비동기적 방법은 전체 Time-order 순이 아닌 로컬 Time-order를 가진다. 그러나 비동기적 방식에는 분산된 시뮬레이터들 간의 전체 Time-order를 유지하기 위해 전 처리된 시뮬레이터 결과들을 저장하는데, Time-order 상으로 현재의 시뮬레이션 시간보다 과거의 사건이 왔을 때 그 이벤트를 처리해주어야 되기 때문이다. 이러한 비동기적 분산 시뮬레이션 방법론에서는 전체 Time-order를 유지하기 위해 과거의 Time-order를 가지는 이벤트가 왔을 때 rollback operation을 수행한다. 그러나 rollback operation은 분산 시뮬레이션 방법론에서 성능 장애요소 중 하나이다. 본 논문에서는 rollback operation을 최소할 할 수 있는 DEVS 모델 분배 방법을 제안한다.

• The Journal of Engineering Geology
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• v.19 no.1
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• pp.9-14
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• 2009

In this work applicability of a sharp-interface model to well-scale problems is examined. In coastal areas one of the main concerns in groundwater development is saltwater intrusion. To determine the saltwater intrusion at a well one needs to evaluate the saltwater content from a pumping well. We conducted laboratory sand-tank experiments to determine if a sharp-interface model can simulate the saltwater content of a pumping well. Lateral saltwater intrusion experiments and freshwater lens experiments are conducted. A partially penetrating well and a fully penetrating well are used. Comparison between numerical results and observation results indicates that the sharp-interface model can determine saltwater contents reasonably well. We conclude that a sharp-interface model can be applied to well-scale groundwater flow problems in coastal areas.