• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.4
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• pp.612-623
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• 2022

Estimation of the presence of people in real time is extremely useful for businesses in providing better services. Many companies and researchers have attempted various researches in order to count the number of floating population in a specific space. Recently, as part of smart cities and digital twins, commercialization of measuring floating populations using Wi-Fi signals has become active in the public and private sectors. In this paper we present a method of estimating the floating population based on MAC-address values collected from smartphones. By distinguishing Real MAC-address and Random MAC-address values, we compare the estimated number of smartphone devices and the actual number of people caught on CCTV screens to evaluate the accuracy of the proposed method. And it appeared to have a similar correlation between the two datas. As a result, we present a method of estimating the floating population based on analyzing Wi-Fi Probe Requests.

• Korea journal of population studies
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• v.28 no.2
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• pp.1-32
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• 2005

The optimum population of a society or country can be defined as 'the population growth path that maximizes the welfare level of the society over the whole generations of both the present and the future, under the paths allowed by its endowments of production factors such as technology, capital and labor'. Thus, the optimum size or growth rate of population depends on: (i) the social welfare function, (ii) the production function, and (iii)demographic economic interrelationship which defines how the national income is disposed into consumption(birth and education of children included) and savings on the one hand and how the demographic and economic change induced thereby, in turn, affect production capacities on the other. The optimum population growth path can, then, be derived in the process of dynamic optimization of (i) under the constraints of (ii) and (iii), which will give us the optimum population growth rate defined as a function of parameters thereof. This paper estimates the optimum population growth rate of Korea by: specifying (i), (ii), and (iii) based on the recent development of economic theories, solving the dynamic optimization problem and inserting empirical estimates in Korea as the parametric values. The result shows that the optimum path of population growth in Korea is around TFR=1.81, which is affected most sensitively, in terms of the size of the partial elasticity around the optimum path, by the cost of children, share of capital income, consumption rate, time preference, population elasticity of utility function, etc. According to a survey implemented as a follow up study, there are quite a significant variations in the perceived cost of children, time preference rate, population elasticity of utility across different socio-economic classes in Korea, which implied that, compared to their counterparts, older generation and more highly educated classes prefer higher growth path for the population of Korea.

• Proceedings of the Korean Statistical Society Conference
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• 2004.11a
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• pp.271-276
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• 2004

이 논문에서는 유한모집단 분포함수에 대한 추정량들을 소개하고, 이론적인 측면과 경험적인 측면으로 비교하였다 분포함수 추정량은 설계기반 특성을 갖는 추정량과 모형기반 특성을 갖는 추정량으로 구분되며, 각각 설계기반 특성과 모형기반 특성을 갖는다. 수치적인 비교를 위하여 분포함수 추정량들을 2000년 인구주택 총 조사의 서울 가구수와 가구원수 데이터에 적합하여 비교하였다.

• Feed Journal
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• v.2 no.8
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• pp.68-74
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• 2004

세계 인구는 이미 1999년 10월에 이미 60억원을 넘어섰고 앞으로 중간정도의 예측치를 가정해도 2050년에는 90억 정도가 될 것으로 추정된다. 이러한 세계 인구의 증가와 식량생산의 한계성을 들어서, 세계 최고 권위의 민간 환경 연구 단체인 월드워치 연구소의 창설자이자 소장인 Lester R. Brown 박사는 번역서 “누가 중국을 먹여 살릴 것인가?”(따님환경신서 18; 1998)와 “풀하우스: 인구ㆍ식량 ㆍ환경”(따님환경신서 15; 1997)에서 세계의 식량난이 21세기에 불어닥칠 것으로 예측하고 있다.(중략)

• Journal of the Korean Regional Science Association
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• v.31 no.1
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• pp.21-42
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• 2015

This paper investigates whether urban expansion and the vitalization of the local economy can be achieved through new city development. The results show that regardless of the starting point (origin) or destination point, traffic increases closer to the origin for the purpose of transportation and decreases farther from the origin. However, traffic tends to increase in districts 20 to 40 km away from the origin. Hence, building a new city in this district may be effective in terms of geography and functionality.

• Journal of the Korean Data and Information Science Society
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• v.26 no.4
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• pp.907-914
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• 2015

Reduction in the number of students due to the low birth rate has notice very many changes in the national education policies. The purpose of this study is to propose a method for estimation of the number of students (the population) by age or grade promotion rate of progression rate to estimate the exact number of students (the population) by 2032. It was suggested the nth moving average proportional method and the weighted proportional moving average method as the method of population projections. It presents the means and standard deviations of the measurement errors of the suggested methods by Monte Carlo simulation. Measured in this study are predicted result was a phenomenon is estimated lower than the actual value.

• International Area Studies Review
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• v.21 no.4
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• pp.85-100
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• 2017

The study tries to shed empirical light on the relation between the concentration of population in the primary city and per capita economic growth of the country, using the data for 113 nations over the period, 2000-2010. The concentration of population is measured in two ways, the ratio of the primary city's population to the total and to the second city. Using the ratio of the primary city's population to that of the entire nation, the empirical results neither show the robust negative relations nor the reverse U relation between primary city's concentration and economic growth. The ratio of the primary city to the second city however turns out to have a negative relation to per capita GDP growth. This result implies economic growth of a nation can be enhanced by decreasing the gap between the primary and the second ranked cities and does not support the reverse U hypothesis by Handerson(1974, 2003).

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.5
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• pp.479-485
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• 2011

A number of case studies that find distribution of longevity population and influencing factors through the spatial data fusion using GIS techniques are growing. The majority cases of these studies are adopt census administrative boundary data for the spatial analysis. However, these methods cannot fully explain the phenomenon of longevity because there are a variety of spatial characteristics within the census administrative boundaries. Therefore, studies of spatial unit are required that realistically reflect the phenomenon of human longevity. The dasymetric mapping method enables to product of spatial unit more realistic than census administrative boundary map and statistic estimates of small area utilizing diversity spatial information. In this study, elderly population of small area has been estimated within statistically significant level that applied the vector based dasymetric mapping method. Also, the cluster analysis confirmed that the variation of local spatial relationship within census administrative boundary. The result of this study implied that the need for local-level studies of the human longevity and the validity of the dashmetric mapping techniques.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.7 no.2
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• pp.6-13
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• 1986

세계인구는 매년 8천 5백만명이 증가 총49억명에 달했으며 20세기말에는 60억을 돌파할 것으로 추정된다. 인구 증가율은 다소 감소했으나 사망률이 낮아진 반면 출산율이 계속 높은 수준을 보여 세계인구는 계속 증가하는 추세이다. 이에 반하여 세계 농업생산 증수율은 인구 증가에 비하여 점차 떨어지는 실정이다. 최근 우리나라의 식량 자급율(自給率)은 50$\%$를 밑돌고 있는 형편이다. 더구나 근래에 와서 세계적 기상이변(氣象異變)으로 특히 아프리카의 수단과 같은 나라는 수년간 한발(旱魃)이 계속되어 수백만의 사람들이 굶어 죽거나 굶주리고 있는 상황이다. 이와 같은 인구 증가에 따른 식량의 확보(確保)와 농산물의 증산(增産)은 이용 가능한 농경지(農耕地)가 제한되어 있는 한 단위 면적당(單位 面積當) 수량(收量)을 높이는 수 밖에 없다. 이 목적을 달성시키기 위하여는 품종개량(品種改良), 경종법(耕種法) 개선 등 여러 가지 방법을 들 수 있으나 그 중에서도 가장 간편하고 효과가 큰 방법으로는 병$\cdot$해충$\cdot$잡초(病$\cdot$害蟲$\cdot$雜草)의 피해(무방제시의 감수율 $40\sim60\%$)를 막아 수량을 올리는 것이다.

• Korea journal of population studies
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• v.35 no.2
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• pp.1-28
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• 2012

In this study, labor force projections are made in order to examine the process and magnitude of labor shortage caused by population ageing in Korea. Starting from theoretical review and analysis of population projection data, this study presents that serious transitions of labor market are expected to begin between 2020 and 2030. This study shows even in case of encouraging higher labor participation, labor shortage cannot be offset but only delay and alleviate effects of population ageing. Finally, this study points out some important implications of labor policy including sensitive social and political issues which should be considered.