• 대한교통학회지
• /
• 제14권1호
• /
• pp.29-42
• /
• 1996

Among trip distribution models, The BPR type Gravity Model is the one which is the most widely used. The key issue associated with this model is a functional form of friction factor which should be calibrated in the process, and interpretation for socioeconomic factor known as K-factor(Kij) which is used to adjust the difference between observed zone-to-zone trips and the estimated trips. In this study, the BPR type Gravity Model has been fitted to 1990 O/D data for Seoul. Two type of function form for friction factor has been employed : one is a form of Generalized function and the orther is UTP function. With above two function, the parameters for travel distance(Skin-tree) are prepared. The relationship between socioeconomic factor and trips is identified by calculating and analyzing the characteristics of Kij. Consequently, both of the friction factor functions are statistically signified. However, it show an overestimation tendency when estimated with UTP function. It is found that the Generalized function is suitable for the city of Seoul, and also, in case there are a lot of trips correlatively, the socioeconomic factor is close to 1, on the other hand if it's small, it shows a bias which is dispersed around 1.

• 한국정밀공학회지
• /
• 제20권7호
• /
• pp.208-216
• /
• 2003

In this paper, a two-dimensional electroelastic analysis is performed on a piezoelectric material with an open crack. The approach of Lekhnitskii's complex potential functions is used in the derivation and Bueckner's weight function theory is extended to piezoelectric materials. The stress intensity factors and the electric displacement intensity factor are calculated by the weight function theory.

• 한국해양공학회지
• /
• 제24권3호
• /
• pp.59-63
• /
• 2010

In this paper, an electroelastic analysis is performed on a piezoelectric material with an open crack in anti-plane deformation. Bueckner’s weight function theory is extended to piezoelectric materials in anti-plane deformation. The stress intensity factors and electric displacement intensity factor are calculated by the weight function theory.

• 산업경영시스템학회지
• /
• 제3권3호
• /
• pp.59-66
• /
• 1980

The purpose of this paper to study on measuring method in technical progress. Technology is combination method of raw material and capital, land, labour. The first step to technical Progress is COBB-DOUGLAS production function, so technical progresses are important role in economic growth and development. General production function from Y=f(K, L, T) and COBB-DOUGLAS production function Y=${AK^I}{L^b}$ is first condition. Technical progress is saving of production factor In capital saving, labour saving, neutral saving. Marred Hicks Robinson has Insist on technical progress by each view of production factor, but, what is most excellent measuring method of technical progress\ulcorner I : productivity index method. II : Gross Production function method. Productivity method used in every products level in weight values, gross method function method used in production factor attributed to products. Above two measuring method has delicate problem in each input factor, substitution relation and production factor simultaneously linked each others This basic problem based on technical progress is not solubable in this time.

• 한국인터넷방송통신학회논문지
• /
• 제18권2호
• /
• pp.105-110
• /
• 2018

본 논문에서는 NM-MMA (Novel Mixed-Multi Modulus Algorithm) 알고리즘에서 mixed 비용 함수를 얻기 위한 scaling factor값에 의한 적응 등화 성능을 비교하였다. NM-MMA의 mixed 비용 함수는 MMA와 SE-MMA 비용 함수에서 gradient vector를 적절한 scaling factor 가중치 합으로 구성되며, 이를 이용하여 탭 계수 갱신을 하므로서 기존 방식들의 수렴 속도와 MSE양을 개선할 수 있다. 논문에서는 scaling factor를 변화시킬 때 동일한 채널과 스텝 크기 및 신호대 잡음비의 환경에서 컴퓨터 시뮬레이션을 수행하여 등화기 출력 성상도, 잔류 isi, MD, MSE 및 SER 성능을 비교하였다. 컴퓨터 시뮬레이션의 결과 MMA 비용 함수의 가중치가 SE-MMA 비용 함수의 가중치보다 큰 경우에는 성능 지수의 잔여량에서 우월하며, 그 반대의 경우 수렴 속도가 개선됨을 확인하였다.

• 디지털융복합연구
• /
• 제17권12호
• /
• pp.117-127
• /
• 2019

본 연구의 목적은 중국 소비자의 휴대폰 선택 시 고려하는 주요 평가영역에 대한 세부 특성요인의 만족도가 해당 평가영역 만족도에 어떠한 영향을 미치며, 각 평가영역에 대한 만족도가 고객의 재구매의도와 타인추천의도에 어떠한 영향을 미치는가를 사용 휴대폰 유형에 따른 집단별로 분석하는데 있다. 설문조사 시 평가요인으로 가격, 디자인, 품질, 편리성, 기능 그리고 개인적 요인을 설정하였으며, 재구매의도와 타인추천의도로 구분 실시하였다. 연구결과, 가격을 제외한 모든 특성요인이 해당 평가영역의 만족에 유의한 것으로 나타났으며 유의한 경로가 집단별로 차이가 존재함을 알 수 있었다. 또한 모든 집단에서 평가영역에 대한 만족이 재구매의도와 타인추천의도에 유의한 것으로 평가되었다. 연구 결과 우리 기업의 경우 디자인, 기능, 개인적 요인에 관한 특성요인은 평가영역 만족에 유의한 영향을 미치나 해당 특성요인의 만족도는 상대적으로 낮은 것으로 나타난다. 따라서 이들 특성요인에 대한 만족도를 높일 수 있는 품질 개선방안을 강구하여야 할 것으로 사료된다.

• 한국조리학회지
• /
• 제14권2호
• /
• pp.99-114
• /
• 2008

The purpose of this study is to examine the relationships between each type of attitudes toward money and the attributes of choosing family restaurants. A self-administrated questionnaire was completed by 387 students, and data were analysed by frequency, factor, reliability and canonical correlation. Seven factors were obtained from factor analysis of attitudes toward money; Factor 1 "power", Factor 2 "obsession", Factor 3 "retention", Factor 4 "achievement", Factor 5 "anxiety", Factor 6 "distrust", and Factor7 "evaluation". The attributes of family restaurant choice were extracted into six factors: Factor 1 "quality of food", Factor 2 "restaurant event", Factor 3 "interior environment", Factor 4 "value of food", Factor 5 "convenience for approach", and Factor 6 "employees' service". Canonical correlation analysis showed three significant functions. Canonical function 1 showed that the attitudes of considering the power of money, its retention and achievement were indicated to have significantly positive relationships with the quality of food in the attributes of choosing family restaurants. Canonical function 2 showed that significantly negative relationships between distrust and restaurant events and convenience for approach. Canonical function 3 also showed that significantly positive relationships between obsession and anxiety and the interior of restaurants and employees' service, and significantly negative relationships between evaluation and the interior of restaurants and employees' service.

• 전기학회논문지
• /
• 제66권3호
• /
• pp.475-485
• /
• 2017

This paper develops a conversion function and method transforming from daily peak load curve used $LOLE_D$ [days/year] to hourly load curve used $LOLE_H$[hours/year]and describes relationship between $LOLE_D$ [days/year] and $LOLE_H$ [hours/year]. The indices can not only be transformed just arithmetically but also have different characteristics physically because of using their different load curves. The conversion function is formulated as variables of capacity and forced outage rate of generator, hourly load daily load factor and daily peak load yearly load factor, etc. Therefore, the conversion function (${\gamma}={\varphi}$(.)) can not be simple. In this study, therefore, the function is formulated as linear times of separated two functions. One is an exponential formed conversion function of daily load factor. Another is formulated with an exponential typed conversion function of daily peak load yearly load factor. Futhermore, this paper presents algorithm and flow chart for transforming from $LOLE_D$[days/year] to $LOLE_H$[hours/year]. The proposed conversion function is applied to sample system and actual KPS(Korea Power System) in 2015. The exponent coefficients of the conversion functions are assessed using proposed method. Finally, assessment errors using conversion function for case studies of sample system and actual system are evaluated to certify the firstly proposed method.

• 한국주거학회논문집
• /
• 제19권5호
• /
• pp.37-46
• /
• 2008

The purpose of this study is to derive and adapt the Valuation Factor of urban regeneration scientifically and synthetically, which is the basis of developing a rational plan for urban revitalization. For this, we have selected 37 factors relating to urban regeneration as outlined in preceding studies and inquiry about importance of factors. we analysed he Valuation factors influencing he importance of urban revitalization through a questionnaire which was completed by inhabitants and expert groups in Gwangju Metropolitan City. From he results of he Factor analysis using SPSSWIN(VER.14.0), it was found that the factors which influence the importance of urban regeneration are Environment, Function, Resources and Policy Factors. Environment Factor comprises amenity, culture, beauty and convenience, The while the Function Factor comprises interchange, information, complexity and security. This classification has credibility because of the high factor loading through the Varimax Factor Analysis and is due to a high Cronbach's coefficient. There is a strong correlation between the classified factors through correlation analysis. Finally, through AMOS (Analysis of Moment Structure) 16.0 it was found that the upper classification is credible because main suitability index confirms recommending an admission standard.

• 수산경영론집
• /
• 제53권1호
• /
• pp.1-16
• /
• 2022

This paper aims to propose a new systematic approach to analyze the factor productivity and to investigate those characteristics of factor productivity in operational and managerial perspectives. The Cobb-Douglas production function is adopted to estimate the labor and capital productivity. In estimating those productivities the data of The Research on the Actual Condition of Coastal Fisheries (RACF), especially those of Jeon-Nam Province are used. The statistical analysis of RACF data shows that the characteristics are a little bit different between labor and capital of the operational equipment in the coastal fisheries. The Cobb-Douglas type production function is useful in estimating the factor productivity, especially in case of 'coastal Stow-net fishery' even though the limited data is used. However, in case of 'trap fishery,' the Cobb-Douglas production function appears to have some limitations in estimation. This implies that estimating the factor productivities in fisheries employing broad perspectives and various methods are needed.