• 대한수학회지
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• 제43권1호
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• pp.87-98
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• 2006

In this paper, a class of constrained inverse eigenvalue problem for antisymmetric matrices and their optimal approximation problem are considered. Some sufficient and necessary conditions of the solvability for the inverse eigenvalue problem are given. A general representation of the solution is presented for a solvable case. Furthermore, an expression of the solution for the optimal approximation problem is given.

• 대한수학회지
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• 제45권2호
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• pp.405-423
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• 2008

By using critical point theorem, we study a higher order difference system, and obtain some new sufficient conditions ensuring the existence of periodic solutions for such a system.

• 농촌계획
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• 제22권4호
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• pp.25-36
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• 2016

The purpose of this study is to construct a quantitative evaluation method that can analyze the policy effectiveness with the construction of a implicit composite index incorporating spatial econometrics models. In order to propose a methodological framework for the program evaluation, this study conducts an empirical analysis with the application of the Comprehensive Rural Village Development Project (CRVDP) which explicitly claims to achieve comprehensive goal of community development. The present study pays particular attention to quantifying the composite evaluation index and drawing net effect through the application of a series of spatial econometrics models. The spatial unit of the analysis is drawn at Eup-Myeon level in rural areas in Korea, and the time horizon is in between 2005 and 2010. We utilize the Korean Agricultural Census data in 2005 and 2010. Three steps of methodological processes are needed to satisfy the objective of the present study. First, we apply factor analysis to construct the composite index that represents comprehensive settlement environment in rural area. The index should be matched with the main objective of the CRVDP. Second, we apply the derived index to a series of spatial econometrics model as dependent variable. Lastly, utilizing the estimated coefficients of the econometrics models, we apply decomposition technique to estimate CRVDP's net effect from both cross-sectional and longitudinal perspectives. We find that the results of the decomposition analysis by the execution of the CRVDP are positively associated with the explicit object of the project.

• 도시과학
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• 제9권1호
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• pp.33-40
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• 2020

This research aims to analyze the determinants of apartment rents in the Seoul Metropolitan area using spatial econometrics approaches. Since spatial econometrics approaches have advantages to solve limitations of ordinary multiple regression such as spatial dependence and spatial heterogeneity. This research includes structural variables such as number of rooms and baths, neighborhood variables such as number of housing units in the apartment complex, and location variables including distances to subway stations, to traditional markets, to educational institutes, and to urban services such as parks, etc. The result shows that the accessibilities to the CBD, to subcenters, to subway station, to school, and to parks contribute to apartment rent uplift and also shows different spatial variations in rent premiums by accessibility variables. In particular, apartments located south of Han river along the Lines 2, 3, 7 and 9 have the highest rent premiums due to the accessibility to the subway.

• International Journal of Advanced Culture Technology
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• 제9권2호
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• pp.32-38
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• 2021

The purpose of this study is to examine the spatial characteristics of violent and burglary crimes in South Korea. Violent crimes and burglary crimes depend on a spatial setting with good conditions for their criminal purposes. This study defines population density, racial heterogeneity, types of houses, and density of commercial facilities as variables of place affecting crime in cities and counties. The study collects data from 229 cities in Korea to analyze the effect of spatial characteristics on crime. We conduct additional analyses to meet the statistical requisites of the spatial econometrics model using the open-source software R and GeoDa 1.12.1.129. From the analytical result, population density, racial heterogeneity, apartments, and commercial areas relate to crime occurrence. We suggest the implication of the theoretical and practical contributions to the relationship between place and crime.

• 응용통계연구
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• 제28권6호
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• pp.1075-1091
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• 2015

이 리뷰논문은 경제분석체계의 발전과정을 계량경제학을 중심으로 살펴보고 불확실성이 더해지는 최근 경제현상의 통계학적 응용성을 모색한 것이다. 지난 반세기 동안 경제학의 분석체계는 발전을 거듭하며 현실 경제문제를 실효적으로 분석하고 예측해왔다. 그 중심에 이론통계학의 추론을 기반으로 하는 계량경제학의 절대적인 기여가 있었다. 최근 들어서는 IT발전, 인터넷과 SNS의 확산 등으로 계량경제학과 통계학의 새로운 연구 환경이 조성되고 있다. 앞으로 경제현상의 복잡다기화와 변동성 증대에 비례하여 분석체계도 정치화되며 발전할 것으로 보이지만, 급변하는 경제환경 변화를 적실하게 분석해내지 못하는 한계를 지적하는 시각도 있다. 한걸음 더 나아가 주류 경제학의 패러다임을 넘어 복잡계, 경제물리학과 같은 접근방법을 적극적으로 적용해야한다는 주장도 나오고 있는데, 이 또한 통계학에게는 도전이 되고 있다.

• 농촌지도와개발
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• 제6권2호
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• pp.105-118
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• 1999

There are two viewpoints in agricultural extension. One is economics(econometrics) the is non-econometric social sciences. In Korea economic means mainstream economics. Most mainstream economists have tried to solve the social and economic problems of Korea using their basic principles and econometrics. This mainstream economics have been supported by the Korean government and many people due to its convenience, effectiveness, and clearness. However, Agriculture and agricultural extension should be studied through multidisciplinary approaches after considering their specific social structures. Especially, Korean agriculture and agricultural extension have many aspects that can not be easily explained by main stream economics. In this study, the researchers will; 1)identify the origin, growth, and limitation of mainstream economics, i.e. econometrics 2)identify the paradigm and the view of social sciences and out-of-mainstream economics to make up for the limitation of main stream economics in explain the agriculture and agricultural extension in Korea, and 3)suggest to use multidisciplinary approaches to solve the agriculture and agricultural extension in Korea.

• 한국콘텐츠학회논문지
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• 제11권8호
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• pp.409-418
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• 2011

본 연구의 목적은 특수 목적관광유형들 간의 대체보완관계 및 총 개인관광수요와 각 유형의 특수목적관광 사이의 인과관계를 조사하기 위한 것이다. 서울에 거주하고 있는 500개의 표본 중에서 349개의 유효표본이 분석에 이용되었다. 통계적 분석방법으로서 상관관계분석은 대체보완관계의 파악을 위해 그리고 인과관계분석을 위해서는 계량경제모델이 적용되었다. 연구결과, 농촌관광과 해양관광은 상호 경쟁적 대체관계에 놓여 있었으며, 해양관광은 다른 어느 유형의 특수 관광보다 총 개인관광수요에 미치는 영향이 강하게 나타났다.

• 농촌계획
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• 제26권3호
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• pp.103-113
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• 2020

Land price can be affected by convenience or psychological repulsion like PIMFY (Please In My Front Yard) or NIMBY (Not In My Back Yard) for various facilities. The purpose of this study is to evaluate whether non-preferred facilities are related to NIMBY impact that negatively affect land prices using the spatial econometrics models which are spatial autoregressive models (SAR), spatial errors models (SEM), and general spatial model (SAC). The land price in urban area increases by 0.07-0.2% when the distance from aversion facilities increases by 1%. However, the land price in rural areas decreases when the distance from aversion or pollution facilities increase. Therefore, these facilities in rural areas located in the areas with higher land price because funeral homes located in center of rural administrative areas and charnel house or crematorium located in the fringe of urban areas. That is, this study explain the difference between land price and non-preferred facilities in urban and rural areas and why there are more N IMBY symptoms in urban areas.

• 농촌계획
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• 제14권4호
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• pp.97-108
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• 2008

The present study construct a new technique that can evaluate diverse rural policies, which have been applied to the rural development programs at the village level. The method incorporates spatial econometrics models with a decomposition method that has little been utilized before. We applies the technique to evaluate the rural development programs that have been carried out by the Korea Forest Service and. Korea Rural Development Agency. The technique proved to be quite useful in that the technique efficiently separate the direct effect caused by the government policy from the effect explained by the endowment effect such as regional or area characteristics, and residual effect that cannot be identified by the models. The present study concludes with suggesting more quantitative methods need to be developed to evaluate diverse government policy programs, which enables us to discern correct policy effects.