• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.144-147
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• 1999

The objective of this study is to quantitatively evaluate the effects of various SAR speckle reduction methods for multisource land-cover classification by backpropagation neural network, especially over the coastal region. The land-cover classification using neural network has an advantage over conventional statistical approaches in that it is distribution-free and no prior knowledge of the statistical distributions of the classes is needed. The goal of multisource land-cover classification acquired by different sensors is to reduce the classification error, and consequently SAR can be utilized an complementary tool to optical sensors. SAR speckle is, however, an serious limiting factor when it is exploited for land-cover classification. In order to reduce this problem. we test various speckle methods including Frost, Median, Kuan and EPOS. Interpreting the weights about training pixel samples, the “Importance Value” of each SAR images that reduced speckle can be estimated based on its contribution to the classification. In this study, the “Importance Value” is used as a criterion of the effectiveness.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2015년도 춘계학술대회
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• pp.181-182
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• 2015

최근에는 대내외적 환경변화로 인하여 해양산업의 중요성은 높아지고 있다. 자원고갈, 기후변화, 북극해 개방 등으로 해양산업의 발전을 촉발하고 있다. IT와 융복합화가 요구되고 있는 신해양산업의 수요는 점차 높아지고 있다. 해양산업의 중요성에 대한 재인식이 필요한 시점이다. 따라서 국가차원의 해양산업 활동 수준을 평가하기 위해서는 해양산업에 대한 체계적인 분류체계가 구축되어야 한다.

• 디지털융복합연구
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• 제13권1호
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• pp.305-311
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• 2015

현대에 들어 IT 시장은 대형화와 복합화가 진행되고 경쟁이 더 심화되고 있기 때문에 전통적인 사업관리 방식으로는 관리하기 어려운 정보시스템구축 사업이 많아지면서 이를 효율적으로 관리할 수 있는 제도적 장치와 이를 지원하는 사업관리 프로세스를 도출하기 위하여 실무자(현장PM 및 사업참여자)를 대상으로 설문조사를 실시하였다. 이를 통해 소프트웨어개발 사업관리 요소기술의 중요도와 취약도를 파악하여 개선해야 할 요소기술이 도출되었고, 이를 활용하여 사업관리의 필요성과 총괄사업관리자의 역할과 핵심 사업관리 분야를 결정하는데 논리적 근거를 제시하는 매우 유의미한 결과를 얻었다.

• 한국안전학회지
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• 제34권1호
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• pp.14-20
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• 2019

This paper presents a safety assessment based approach for the safe operation for PCS(Power Conditioning System) of photovoltaic and energy storage systems, applying FTA. The approach established top events as power outage and a failure likely to cause the largest damage among the potential risks of PCS. Then the Minimal Cut Set (MCS) and the importance of basic events were analyzed for implementing risk assessment. To cope with the objects, the components and their functions of PCS were categorized. To calculate the MCS frequency based on IEEE J Photovolt 2013, IEEE Std. 493-2007 and RAC (EPRD, NPRD), the failure rate and failure mode were produced regarding the basic events. In order to analyze the top event of failure and power outage, it was assumed that failures occurred in DC breaker, AC breaker, SMPS, DC filter, Inverter, CT, PT, DSP board, HMI, AC reactor, MC and EMI filter and Fault Tree was drawn. It is expected that the MCS and the importance of basic event resulting from this study will help find and remove the causes of failure and power outage in PCS for efficient safety management.

• 정보보호학회논문지
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• 제22권6호
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• pp.1407-1417
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• 2012

소프트웨어 시스템을 보안 침해로부터 보호하기 위해서는 소프트웨어의 개발 단계에서부터 생명주기 전체에 걸쳐 보안약점을 제거하는 작업이 요구된다. 이러한 작업을 수행함에 있어서 계속하여 보고되고 있는 다양한 보안약점들에 대하여 시스템 보안과 실제 활용 목적에 미치는 영향이 큰 보안약점을 선별하여 적절히 대처하는 것이 효과적이다. 본 논문에서는 소프트웨어 보안약점 및 보안취약점의 중요성에 대한 기존의 정량 평가 방법론들을 소개하고, 이를 기반으로 신뢰도가 중요시되는 소프트웨어 시스템에 대하여 보안약점의 일반적인 심각성을 객관적으로 평가할 수 있는 정량 평가 기준을 제안한다. 또한 제안된 기준을 사용하여 2011 CWE/SANS Top 25 보안약점 명세에 대한 중요도 평가를 수행하고 그 결과를 기존 점수와 비교함으로써 제안된 평가기준의 유용성을 보이고자 한다.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.716-717
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• 2015

A construction temporary work is main process and importance trade section. A technology system of construction temporary has very low availability of field works and needs improvements in Korea as construction site has a quick response about new requirements. This study reviews literature researches and can verify that changes to a comprehensive technology system for construction site. In addition, it suggests a breakdown structure of new standards for temporary construction technology based on views of construction site managers. Meanwhile, temporary construction technology in Korea has changed with a specification of construction temporary work which had been revised in 2014. However, the revision is merely dividing the design and building off of construction temporary technology. It is lacking in many ways to change this in a new standard system for temporary construction technology. Henceforth, it needs to develop a standard system for temporary construction technology and a professional system that is appropriate for different purposes by detail trade sections.

• 산업경영시스템학회지
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• 제33권4호
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• pp.145-152
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• 2010

Under limited resources such as budgets and experts, it is necessary to make decisions for promotion strategy of standardization work items in Information and Communication Technologies (ICTs). This paper focuses on a method of setting standardization promotion strategies for each item of personal information security standardization. As a decision making tool, the Importance Performance Anaysis (IPA) is applied and analyzed to the decision processes. The results are showed and illustrated for useful inputs to practical policy making in the field of standardization activities.

• Journal of Multimedia Information System
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• 제2권1호
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• pp.187-192
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• 2015

The aim of this study was to develop and analyze a short course educating App Inventor and Arduino that showed the importance of software for youth. The course consists of a total of 10 missions for a 4 hour course divided into 2 parts, each 2 hours respectively. We conducted a basic course of Arduino for hardware and software, Processing for server programming, and App Inventor for programming for smartphones. The final mission was to send a signal to a server with a smartphone and to control light connected to a relay which passes Arduino connected with a server and serial communication. Participants completed 95% of missions, and we found the course had an educational effect for improving creativity and realization of software importance.

• 산업경영시스템학회지
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• 제24권63호
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• pp.33-43
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• 2001

To estimate the reliability of a large and complex network with a small variance, we propose two dynamic Monte Carlo sampling methods: the sequential minimal cut set (SMCS) and the sequential minimal path set (SMPS) methods. These methods do not require all minimal cut sets or path sets to be given in advance and do not simulate all arcs at each trial, which can decrease the valiance of network reliability. Based on the proposed methods, we develop the importance sampling estimators, the total hazard (or safety) estimator and the hazard (or safety) importance sampling estimator, and compare the performance of these simulation estimators. It is found that these estimators can significantly reduce the variance of the raw simulation estimator and the usual importance sampling estimator. Especially, the SMCS algorithm is very effective in case that the failure probabilities of arcs are low. On the contrary, the SMPS algorithm is effective in case that the success Probabilities of arcs are low.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.943-946
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• 1993

This paper presents design criteria of an overlapping decentralized controller by investigating the controllability and closed loop stability of the expanded system. To determine the criteria we classify the overlapping decentralized controller into an overlapping expanded controller and a contractible controller. It is shown that conditions of system expansion to design these controllers are differently used. The overlapping expanded controller needs the aggregation conditions due to the importance of a structure of the expanded system. The contractible controller which intends to use in the original space needs the restriction because of stability of the original system.