• Title/Summary/Keyword: Korean Population

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Study of Countermeasures of Population Decrease in Marginal Village in Japan (일본 '한계취락(限界聚落)'의 인구감소 대책방안 사례연구)

  • Joung, Kyung-Hee;Lee, Jae Hoon;Kim, Byung-Ryang
    • Journal of the Korean housing association
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    • v.25 no.3
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    • pp.35-43
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    • 2014
  • Korea is the most rapidly aging country in the OECD countries, becoming 'an aging society' in 2010, when over 12% of the population had reached the age 65 and beyond. Along with the population aging, problems of the elderly have become a social issue. Also, the elderly population in most farming villages is increasing due to the cityward concentration of younger generation and the rapid urbanization centered around the capital area. Yet no definite success in revitalization of these villages has been reported despite the acknowledgement of the problems arising from such phenomena. Therefore, by examining "marginal villages" (communities whose joint social activities are difficult to maintain as over 50% of the population is 65 years or older) in Japan, which at this point has entered "the ultra-aged society" before Korea, this study intends to compare and analyze the countermeasure plans for the population decrease in these villages. The case study has been done with the focus on the literary references published in Japan such as papers, various reports, statistics, newspapers, and journals.

Genetic Distances between Two Echiuran Populations Discriminated by PCR

  • Yoon, Jong-Man
    • Development and Reproduction
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    • v.23 no.4
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    • pp.377-384
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    • 2019
  • Genomic DNA extracted from representatives of two populations, Gunsan and Chinese, of Urechis spp. was amplified using PCR with several primers. The band-sharing (BS) value between individuals no. 05 from the Gunsan population and no. 22 from the Chinese population was 0.206, which was the lowest recognized value. Oligonucleotides primer OPC-04 revealed 44 unique loci, which distinguished the Chinese population. Primer OPB-17 allowed the discovery of 22 loci shared by the two populations, which were present in all samples. Based on the average BS results, individuals from the Gunsan population demonstrated lower BS values (0.661±0.012) than did those from the Chinese population (0.788±0.014; p<0.05). The shortest genetic distance (GD) displaying a noteworthy molecular difference was between individuals CHINESE no. 12 and no. 13 (GD=0.027). Individual no. 06 from the Gunsan population was most distantly related to CHINESE no. 22 (GD=0.703). A group tree of the two populations was constructed by UPGMA Euclidean GD analysis based on a total of 543 fragments generated using six primers. The explicit markers recognized in this study will be used for genetic analysis, as well as to evaluate the species security and proliferation of echiuran individuals in intertidal regions of the Korean Peninsula.

Returning Farmers and the Aging of Farm Households: Prospects of Changes in Rural Population by Their Influx (귀농과 농가 고령화: 귀농인구 유입에 따른 농촌 인구구조 변화 예측)

  • Roh, Jae-Sun;Jung, Jin Hwa;Jeon, Ji Yeon
    • Journal of Korean Society of Rural Planning
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    • v.19 no.4
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    • pp.203-212
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    • 2013
  • The aging of farm households has caused serious problems such as productivity slowdown and aggravated income polarization in South Korea. Urban-to-rural migration has been recently suggested as a measure to attenuate the aging of rural population and other related problems. The inflow of migrants for farming can have a substantial effect on agriculture and rural communities while the natural adjustment of rural population caused by birth and death is slow. This paper forecasts population distribution of different provinces using the Origin-Destination (OD) analysis, taking into account both the size and directions of migration. In the analysis, nodes where the migration takes place are divided by the industrial sectors (agriculture and non-agriculture), regions, and ages. The results of a ten-year forecast shows that the aging of total population in most provinces will be intensified, but the portion of people over sixty will decrease in the agricultural sector. This finding implies that migration into rural areas, when occurring by a large extent, can mitigate the aging process and attendant problems.

Vegetation Structure and Ecological Properties of Eleutherococcus senticosus Population (가시오갈피(Eleutherococcus senticosus)개체군의 식생구조와 생태특성)

  • Jung, Jiyoung;Gwon, Jaehwan;Song, Hokyung
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.16 no.5
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    • pp.27-38
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    • 2013
  • This study was conducted to analyze the correlation between vegetation, environmental factors, and soil characteristic of an endangered species, Eleutherococcus senticosus. Eighteen quadrats in population zones of Seoraksan, Odaesan, Chiaksna, Duckhangsan, Sobaeksan, Juwangsan, and, Jirisan were set up and ordination was analyzed. In the study sites, soil pH, available phosphorous, organic matter and nitrogen were ranged from 5.06~5.43, 24.63~57.77mg/kg, 14.01~18.37%, and 0.63~0.75%, respectively. Eleutherococcus senticosus is classified into Morus bombycis dominant population, Cornus controversa dominant population, and Eleutherococcus senticosus typical population. The importance value of Acer pictum subsp. mono, Morus bombycis, Magnolia sieboldii, Cornus controversa, Tilia taquetii, and Ulmus laciniata in Eleutherococcus senticosus population were 23.76%, 23.61%, 18.06%, 17.82, 15.31%, and 13.57%, respectively. The correlation between vegetation and environmental factors of Eleutherococcus senticosus vegetation distribution were shown to be affected by altitude, slope, and direction.

A Study on the Valuation of Real Estate Using the Applies Real Option Model Considering Population Structure Changes (실물옵션 기법을 응용한 부동산 가치평가 연구: 인구구조 변화를 고려하여)

  • Gu, Seung Hwan;Ping, Wang;Jang, Seong Yong
    • Korean Management Science Review
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    • v.31 no.1
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    • pp.17-26
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    • 2014
  • This study presents a new real estate value analysis model considering the changes in the population structure. We propose a new model that takes advantage of the binomial option model one of the techniques of real options and considers the changes in the population structure. The real estate market price data of Seoul city from year 2001 to 2012 were extracted and the correlation analysis between real estate prices and changes in the population structure was performed. The result shows that they have positive correlation with one year time lag. The coefficient between the real estate prices and demographic changes was estimated using the OLS analysis and included in the traditional binomial option model to calculate the value of the property. It is assumed for the future price prediction that real estate invested in Seoul in January, 2013 will be sold within five years. Analysis result shows that the values of real estate in September of 2013 were predicted as 583.5 million won in the new model and as 582.4 million won in the traditional model. This reflects that the new model considering the change of population change gives better realistic performance than the traditional one.

A Survey on Housing Environment of Vulnerable Population - Focused on the Recipients of Visiting Health Care Services - (취약계층의 주거환경 실태조사 -보건소 방문보건사업 대상을 중심으로-)

  • Kim, Hee Gerl;Nam, Hye Kyung
    • Journal of Korean Public Health Nursing
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    • v.29 no.3
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    • pp.528-539
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    • 2015
  • Purpose: The aim of this study is to provide baseline data on the housing environment of a vulnerable population. Methods: This study provides a descriptive survey on the housing environment of a vulnerable population of a city in Gyeong-gi province. A total of 9,061 households were selected as research participants. Data were collected through face-to-face interviews by visiting nurses from February 2014 to March 2014. Results: Interviewees answered "poor" on items including cold drafts, illumination, daylight penetration, inflow of polluted air, house odor, stairs safety, noise, mold, pests, and ventilation. The score for housing environment problems showed a significant group difference due to gender, age, economic status, family type, type of housing, and type of ownership. Conclusion: These results indicate that the vulnerable population is exposed to a poor housing environment. Thus, there is an urgent need to improve the housing environment for the vulnerable population. Based on this study, linking a visiting health care service program and housing environment improvement projects from relevant administrative agencies might be recommended in order to effectively improve the housing environment.

Genetic Studies on the Lady-Beetle , Harmonia axyridis Pallace, Population in Korea 3. Variation of elytral pattern and elytral edge in southern population (한국산 무당벌레(harmonia axyridis)의 유전학적 연구 3. 남부집단의 초혈반문 및 초혈벽의 변이에 관하여)

  • 강영선;김창효
    • The Korean Journal of Zoology
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    • v.8 no.1
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    • pp.8-10
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    • 1965
  • 1. We have observed the frequency , geographi variation and microgeographic variation of the elytral pattern types and the elytral edge of the population of Lady-beetle, Harmonia axyridis PALLACE, collected in Jinju and other 6 localitites in South Korea. 2. the number of specimen collected were 6,625 in which Succinea was 90.32% : Axyridis ; 0.74% : Spectabilis , 3.82% ; and Conspicua 5.07%. 3. We have found that 92.26% of all specimens have elytral edge. 4. There were some differences in the compositional of the elytral pattern types and elytral edge to the population among the Western seaside , inland and southern seaside of South Korea , whereas as great difference was in the compositional proportion tot he population of Spectabilis between the western and southern seaside . There was also a gret difference of the elytral edge between the inland and southern seaside. 5. A micro-geographic variation was observed in Jinju , located on southern area of South Korea. In the samples collected from the pine trees at Jinju area the Succinea occupied 73.25%, and 69.61 % were found to be provided with elytral edge, while in the general population 92.46% of specimen were Succinea and 98.35% were found to have elytral edge.

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NMDA Receptor-dependent Inhibition of Synaptic Transmission by Acute Ethanol Treatment in Rat Corticostriatal Slices

  • Choi, Se-Joon;Kim, Ki-Jung;Choi, Hyeong-Seok;Kim, Seong-Yun;Yim, Dong-Seok;Cho, Young-Jin;Hahn, Sang-June;Sung, Ki-Wug
    • The Korean Journal of Physiology and Pharmacology
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    • v.10 no.6
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    • pp.303-307
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    • 2006
  • The effects of ethanol on corticostriatal synaptic transmission were examined, using extracellular recording and analysis of population spike amplitudes in rat brain slices, to study how acute ethanol intoxication impairs striatal function. Ethanol caused a decrease in population spike amplitudes in a dose dependent manner (50200mM). Pretreatment with picrotoxin, a γamino butyric acid (GABA)A receptor antagonist, increased the population spikes but ethanol (100 mM) was still effective in decreasing the population spikes under this condition. In the presence of (DL)2amino5phosphonovaleric acid (APV), N-methyl-D-aspartate (NMDA) receptor antagonist, the inhibitory action of ethanol on population spikes was not shown. These results suggest that ethanol inhibits the glutamatergic corticostriatal synaptic transmission through blockade of NMDA receptors.

Efficient Method to Estimate the Number of Exposed People to Industrial Noise Using the GIS and Three Dimensional Noise Mapping - Focusing on the Industrial Noise - (GIS와 3차원 소음지도를 이용한 소음 노출 인구 산정 방법에 관한 연구 - 공장 소음을 중심으로 -)

  • Ko, Joon-Hee;Chun, Hyung-Joon;Chang, Seo-Il
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.17 no.6 s.123
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    • pp.491-497
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    • 2007
  • Reasonably accurate estimation of the exposed population to the distinct levels of noise is essential to the efficient management of urban environmental noise. This study proposes a method of calculating the number of exposed people to industrial noise by using GIS tool and noise mapping. The exposed population of noise based on estimation of the number of people that lived in each building in urban area is compared with the one based on density of population. This study suggests the five step method that consists of gathering the fundamental data, extracting the property from the digital map, noise mapping based on the three dimensional topography, estimating population that lives in each building, merging the various results with GIS tool, and estimating exposed population to industrial noise through analyzing the noise map with GIS tools.

Updated confidence intervals for the COVID-19 antibody retention rate in the Korean population

  • Kamruzzaman, Md.;Apio, Catherine;Park, Taesung
    • Genomics & Informatics
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    • v.18 no.4
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    • pp.45.1-45.5
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    • 2020
  • With the ongoing rise of coronavirus disease 2019 (COVID-19) pandemic across the globe, interests in COVID-19 antibody testing, also known as a serology test has grown, as a way to measure how far the infection has spread in the population and to identify individuals who may be immune. Recently, many countries reported their population based antibody titer study results. South Korea recently reported their third antibody formation rate, where it divided the study between the general population and the young male youths in their early twenties. As previously stated, these simple point estimates may be misinterpreted without proper estimation of standard error and confidence intervals. In this article, we provide an updated 95% confidence intervals for COVID-19 antibody formation rate for the Korean population using asymptotic, exact and Bayesian statistical estimation methods. As before, we found that the Wald method gives the narrowest interval among all asymptotic methods whereas mid p-value gives the narrowest among all exact methods and Jeffrey's method gives the narrowest from Bayesian method. The most conservative 95% confidence interval estimation shows that as of 00:00 November 23, 2020, at least 69,524 people were infected but not confirmed. It also shows that more positive cases were found among the young male in their twenties (0.22%), three times that of the general public (0.051%). This thereby calls for the quarantine authorities' need to strengthen quarantine managements for the early twenties in order to find the hidden infected people in the population.