• 한국기계가공학회지
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• 제19권8호
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• pp.64-72
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• 2020

In this study, a stability analysis was conducted through finite element analysis (FEA) of a simplified model of a fire ladder truck by changing the ascending angle, turning angle, and boundary conditions between the outrigger and the ground. The results of the analysis showed that decreasing the angle of the ladder car increases the moment due to the ladder weight, decreasing the safety factor despite being under the same load conditions. In the case of a rotating radius, the stability was found to vary depending on the boundary conditions. A comparative analysis in the future with these results and the experimental values from the actual fire ladder truck may determine the most appropriate boundary conditions based on the analysis program. It is expected to predict the risk of damage and rollover by assessing the stability of aerial ladder vehicles under different conditions.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2001년도 학술대회지
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• pp.81-87
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• 2001

동적 변화가 상존하는 건설환경에서, 보수·리모델링 프로그램의 관리자는 자원하의 복수 프로젝트를 조정·관리하는데 어려움을 겪게 된다. 프로그램에 내재하는 불확실성과 상호종속성으로 인해, 단위작업의 지연과 그로 인한 연쇄적인 공정계획의 동요는 프로그램 전체의 안정성과 관리가능성을 저해한다. 본 논문은 먼저 건설관리에 적용되었던 생산관리기법들이 프로그램관리에 적용될 수 있는가를 살펴본 후, 프로그램 내부의 자원유동의 흐름에 주기적으로 버퍼를 설치하는 공정 안정화 모델을 제안하고자 한다. 몬테-칼로 시뮬레이션에 의한 비교실험으로 제안된 버퍼 관리모델의 성능을 프로그램의 생산성, 유연성, 그리고 안정성의 관점에서 분석하였다.

• 한국정보시스템학회지:정보시스템연구
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• 제29권4호
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• pp.137-151
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• 2020

Purpose Domestic asset management fintech companies are expected to grow by leaps and bounds along with the implementation of the "Data bills." Contrary to the market fever, however, academic research is insufficient. Therefore, we want to analyze user reviews of asset management fintech companies that are expected to grow significantly in the future to derive strengths and complementary points of services that have been provided, and analyze key elements of asset management fintech companies. Design/methodology/approach To analyze large amounts of review text data, this study applied text mining techniques. Bank Salad and Toss, domestic asset management application services, were selected for the study. To get the data, app reviews were crawled in the online app store and preprocessed using natural language processing techniques. Topic Modeling and Aspect-Sentiment Analysis were used as analysis methods. Findings According to the analysis results, this study was able to derive the elements that asset management fintech companies should have. As a result of Topic Modeling, 7 topics were derived from Bank Salad and Toss respectively. As a result, topics related to function and usage and topics on stability and marketing were extracted. Sentiment Analysis showed that users responded positively to function-related topics, but negatively to usage-related topics and stability topics. Through this, we were able to extract the key elements needed for asset management fintech companies.

• 가정과삶의질연구
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• 제11권2호
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• pp.69-82
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• 1993

Financial stability of households is the basic and most important factor of the quality of life. It affects emotional psychological mental and social aspects of family personal develop-ment and family healths etc. This study investigated and analyzed the data on financial stability of households. The data collected through the self-administered questionnaire from 466 house-holds in Kwangju area were analyzed. As statistical methods Frequency Percentile. Anova Duncan-test and Regression analysis were used. The results obtained are as follow: Education job status housing tenure type numbers of income source assets income and income flexibility have positive effects on financial stability. Especially numbers of income sources has most important effect. Significant correlation coefficients between financial stability and economic pressures mental healths financial satisfaction life satisfaction and coping behaviors were revealed respectively To improve the quality of life financial stability of household is severely considered. To be financially stable providing various income sources is more desirable than having regular and fixed income.

• 환경정책연구
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• 제1권1호
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• pp.91-110
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• 2002

Ecosystem health assessment is an emerging concept regarded as a useful diagnostic tool for evaluating ecosystems. The stability of ecosystem is the main theme in the assessment. Generally, two components - resilience and resistance - are involved in the mechanism of ecosystem stability. In this study, relative degrees of the resistance and the resilience were quantified for most aquatic Insects Inhabiting running waters in Korea. A total of 34 groups were newly categorized based on previous studies, and a conceptual model has been produced. The model was applied for the aquatic insect communities inhabiting different streams and demonstrated that each stream ecosystem possessed different degrees of stability. This study also indicated that it was possible to compare stabilities of different ecosystems using relative degrees of resilience and resistance. Using the conceptual model, suitable conservation and management strategies could be recommended in ecological assessments. The model can be used as a stepping-stone for developing more comprehensive methodology that objectively diagnoses and evaluates the ecosystem stability.

• 자원ㆍ환경경제연구
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• 제32권2호
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• pp.77-105
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• 2023

본 논문은 상장 에너지 공기업의 경영 안정성에 대해 중위투표자이론의 관점에서 분석한다. 2011~2022년 기간 동안 KOSPI에 상장된 한국가스공사, 한국전력공사, 한국지역난방공사, 한국전력기술(주), 한전KPS(주)의 수익성과 안정성에 대해 분석하고, 일반 국민을 대리할 수 있는 중위투표자의 선호와 관련이 있는지 실증분석을 수행한다. 상장 에너지 공기업의 총자산 수익률, 매출액 영업이익률, 자기자본 순이익률로 대리되는 수익성과 자본 대비 부채비율로 대리되는 안정성을 분석한 결과, 근년 들어 상장 에너지 공기업의 경영 안정성은 악화되는 추세에 있는 것으로 나타났다. 또한 공기업의 경영 안정성이 중위투표자의 선호와 관련이 있음이 실증분석 결과로 나타났다. 중위투표자의 소득이 평균소득보다 낮을수록 공기업의 수익성은 하락하고 부채비율은 증가하는 결과를 보여준다. 본 논문은 중위투표자관점에서 공공·에너지 요금의 지나친 부담은 정부와 정치권의 요금 인상 억제의 유인을 강화시켜 공기업의 수익성은 하락하고 부채는 증가하는 결과를 초래할 수 있음을 시사한다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제19권6호
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• pp.49-58
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• 2014

This study was implemented as a part of the experiment to develop two kinds of soil-based Benzo[a]pyrene (BaP) proficiency testing materials (PTMs) for soil analysis. A test was carried out for the check of solubility of the reference material (high purity reagent) using several solvents. Another test was also conducted for the evaluation of homogeneity and stability of two kinds of candidate soil reference materials. The test analysis of BaP in terms of the candidate materials was conducted according to the Standard Soil Analytical Methods by Ministry of Environment. Dissolution of the reference material was shown to vary depending on solvent type and was higher in the order of Dichloromethane > Acetone > Acetone/MeOH (9 : 1) > N-hexane. In addition, the slope on calibration curve for BaP standard solutions was largest on BaP standard solutions prepared with dichloromethane of the tested solvents. Such tendency appeared egually in the commercial BaP standard solution. Therefore, it is thought to be reasonable to use dichloromethane as the solvent in case of the standard stock solution that is used for the measurement of BaP concentration in soil. ISO 13528 and IUPAC protocol were used for verification of homogeneity on the two kinds of soil candidate materials, Both candidate materials were sufficiently homogeneous. Stability assessment of the two candidate materials was made according to ISO Guide 35 and the result showed that both batches did not have any long-term and short term stability issues that might occur during shipping. However, monitoring results of BaP concentration in soil showed that BaP concentration of the two batches measured at 15 days after the sample preparation was reduced by about 24~37% compared with that of the samples measured on 0 day of the sample preparation. Identification was done with several treatments such as irradiation and sterilization etc. The major cause was shown to be irradiation to the samples.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제6권2호
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• pp.127-137
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• 2006

This paper presents an $H_{\infty}$ controller synthesis method for discrete time fuzzy dynamic systems based on a piecewise smooth Lyapunov function. The basic idea of the proposed approach is to construct controllers for the fuzzy dynamic systems in such a way that a Piecewise smooth Lyapunov function can be used to establish the global stability with $H_{\infty}$ performance of the resulting closed loop fuzzy control systems. It is shown that the control laws can be obtained by solving a set of Bilinear Matrix Inequalities (BMIs). An example is given to illustrate the application of the proposed method.

• 대한전기학회논문지:전력기술부문A
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• 제53권5호
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• pp.257-265
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• 2004

The complex documentation involved in power system analysis software require a well-defined and friendly database system. We have developed an object-oriented database management system for power system analysis, and have described load flow analysis and transient stability analysis using object-oriented database(OODB). Database management systems are widely used and achieve high reliability of data management in the engineering fields. However relational database system have shortcomings in application to power system analysis. ill relational database, the data model is too simple for modeling complex data and database languages are very different from programming languages. Object-oriented techniques are sufficiently powerful to support data-modeling requirements of GUI applications. The GUI is implemented using C++ on a MS windows platform. The OODB supports data modeling requirements of GUI applications and the performance is well acceptable for Gill applications.

• 경영과정보연구
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• 제25권
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• pp.321-337
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• 2008

The house price rise suddenly is not only Economic stability but economic, mental state of a heavy burden to people. This paper is a house finance environment analyzed in this research about the rise factor of the house price and the result to present the plan to the natural disposition. The financial institute has an influence on the disguised demand extension of the house and The mortgage Lending in commercial Banks with the earnings as the stability high than the industry loaning. A house finance environment changes and will go from economic factor of the variety of the life style, the housing conditional according to the income level, a children education condition, and the population structure many this little. The disposition of the house need changes according to this and will have an influence on the house price. Necessary for a house market environment house policy of the market need which the consistency reflects so that we are suitable and is desired.