• Korean Chemical Engineering Research
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• 제51권1호
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• pp.127-135
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• 2013

본 연구에서는 개선된 바이오필터설계를 가지는 새로운 바이오필터의 압력강하 및 미생물 population 분포 등을 관찰하고, 같은 유효부피를 갖고 unidirectional flow (UF)를 갖는 전통적 바이오필터의 경우와 비교하였다. 개선된 바이오필터는 운전 초기 또는 정상상태의 장기운전에서 전통적 바이오필터 압력강하의 약 40~80% 이상을 감소시켰다. 미생물 population 분포는 바이오필터 담체인 폐타이어담체와 입상 활성탄의 두 경우 모두 바이오필터 top 단에서 가장 낮았고 바이오필터 밑으로 내려갈수록 미생물 population이 커졌다. 한편 폐타이어담체는 입상활성탄 담체보다 월등히 큰 미생물 population을 나타내는 미생물 콜로니 개체수(CFU counts)를 보였다. 개선된 바이오필터에서 악취가스가 $bottom{\rightarrow}up$으로 공급되는 경우에 악취가스가 $top{\rightarrow}down$으로 공급되는 경우보다 미생물 population 성장이 더욱 컸으며, 입상활성탄 담체보다 폐타이어담체에서 이 현상이 더욱 두드러졌다. 전통적 바이오필터와 개선된 바이오필터시스템 각각의 미생물 population 분포도를 비교하였을 때에, 개선된 바이오필터의 미생물 population은 전통바이오필터보다 입상 활성탄 담체와 폐타이어담체의 경우에 각각 약 15배 및 2.5배 만큼 더 고르게 분포되었다.

• 환경생물
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• 제37권3호
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• pp.335-342
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• 2019

The purpose of this study was to investigate the toxic effects of zinc in collembolan Paronychiurus kimi at the individual (survival and juvenile production) and population (population growth and age structure) levels after 28 days of exposure in artificially spiked soil. These toxic effects were interpreted in conjunction with the internal zinc concentrations in P. kimi. The EC₅₀ value for juvenile production based on the total zinc concentration was 457 mg Zn kg^-1 dry soil, while the LC₅₀ value for adult survival and r_i=0 value for population growth were within the same order of magnitude (2,623 and 1,637 mg Zn kg^-1 dry soil, respectively). Significant differences in adult survival, juvenile production, and population growth compared with the control group were found at concentrations of 1,500, 375, and 375 mg Zn kg^-1 dry or higher, respectively, whereas significant differences in the age structure, determined by the proportion of each age group in the population, were observed in all treatment groups. It appeared that the internal zinc level in P. kimi was regulated to some extent at soil zinc concentrations of ≤375 mg Zn kg^-1 dry soil, but not at high soil zinc concentrations. These results indicate that, despite zinc being regulated by P. kimi, excess zinc exceeding the regulatory capacity of P. kimi can trigger changes in the responses at the individual and population levels. Given that population dynamics are affected not only by individual level but also by population level endpoints, it is concluded that the toxic effects of pollutants should be assessed at various levels.

• 대한인간공학회지
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• 제33권5호
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• pp.387-394
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• 2014

Objective: The purpose of this study is to survey trend and the real state of ageing population in UK, and its charge organizations, relevant policies and studies. Background: As in other countries, UK population is ageing and people aged 65 or over account for about 17% of population in UK. Considering this ageing population, there are varying basic studies and policies for older people in UK. Method: First, the author consulted ageing and its policies in UK with some faculties in an UK university. Next, based on the results of consultation, wide literature survey was conducted, which includes papers in relevant academic journals, publications and website surfing. Results: A number of basic studies for surveying status and characteristics of older people as well as simple population trend for them have been conducted in UK. Healthcare services are free for all UK residents, and varying social care services including equipment, home and residential cares, financial support, etc., are provided by local governments. Cost of social cares is means-tested and is not free for everyone. There are a number of governmental or non-profit organizations dedicated to help older people access social care services or to financially fund research projects older people. Conclusion: There are more basic studies, and healthcare and social care services for older people in UK, compared to Korea. Application: It would be useful as basic data for establishing effective polices for old people in Korea.

• 한국지역사회생활과학회지
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• 제15권2호
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• pp.137-150
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• 2004

The aged population in Korea, especially in rural areas, has been growing rapidly. The welfare for the rural elderly has become a major concern, however we don't have enough information about that population; we don't even have detailed demographics of it. The present research is aimed at; 1) investigating the tendency and changing geographical distributions of the rural elderly, and 2) introducing GIS(Geographic Information Systems) as a useful tool in analyzing geographical distributions of the aged. The General Census Data from 1960 to 2000 was used to carry out this study. The major findings are; 1) There has been a gradual decrease in the rural population over the past 40 years, but this tendency has slowed down more recently; 2) It was observed that the 'oldest-old' group aged 85 years old and over has actuality increased in rural areas faster than any other age group; 3) The changing patterns of the elderly population were different in metropolitan areas and rural areas. In brief, there are far more aged people, especially of the 'oldest-old' group and females in rural areas than those in urban areas. These population, the 'oldest-old' or females, are the most vulnerable and have the greatest need for social welfare and social services of different kinds.

• 한국지역지리학회지
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• 제22권4호
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• pp.761-773
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• 2016

이 연구는 1800년대 중반부터 대한제국까지의 시간 범위에서 한반도를 관찰한 여러 서구인들의 기록들을 인구지리학적 관점에서 고찰한 것이다. 주요 연구 내용은 다음과 같다. 첫째, 여러 서구인들에 의한 기록 중에서 한반도 인구에 관한 내용을 포함하고 있는 약 20여 편의 문헌들을 찾았고, 둘째 해당 문헌에서 한반도 인구와 관련된 서술들을 확인하였는데, 주요 내용은 한반도 전체 인구수, 지역별 인구수, 분포, 밀도, 그리고 이동에 관한 것이었다. 마지막으로 당시 그들이 인구를 매개로 한반도와 그 위의 삶의 모습들을 어떻게 인식하고 있었는지를 해석하였다.

• 한국인구학
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• 제11권1호
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• pp.131-145
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• 1988

1960년 이래 한국사회는 빠른 속도로 인구변천을 경험했다. 인구변천으로 인한 인구구조의 변화는 한국사회의 전반적인 현상이기는 하지만, 특히 이 기간중 많은 인구를 도시로 내보내지 않으면 안되었던 농촌지역에서 그 변화의 폭이 더욱 클 수밖에 없다. 이와 같은 관점에서 이 연구는 주로 최근 농촌사회에서 관찰되는 인구구조의 왜곡현상이 주로 농촌-도시로의 인구이동에 원인이 있으며, 지역단위별로 차별적인 영향을 받을 것이라는 점에 착안하여 농촌의 지역단위별 인구특성에 따른 인구분포의 변화를 비교분석하는 데 초점을 두었다. 이 연구결과 밝혀진 결과를 종합해 보면 농촌은 각 지역단위(군)별로 인구구조상의 격차가 매우 크다는 것이 확인되었다. 따라서 각 지역단위별 인구구조의 변화로 예상되는 농촌의 문제는 군부나 면부의 총괄분석을 통해 알려진 농촌 문제보다 각 지역단위별로 분석할 때 알 수 있는 농촌문제가 훨씬 더 심각함을 알 수 있었다. 이 결과는 농촌을 위한 정책수립 과정에서 지역단위별로 특수성이 고려될 수 있어야 한다는 점을 말해준다.

• 한국농촌건축학회논문집
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• 제24권4호
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• pp.77-84
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• 2022

The purpose of this study is to derive implications by comparing the spatial distribution of each service facility per unit population(1,000 people) with population decline areas. For this purpose, major concepts such as living infrastructure services, Spatial Distribution of Rural Living Service Facilities, areas of declining population, and regional extinction were reviewed and trends in prior research. Based on the literature review, 'Spatial Distribution of Rural Living Service Facilities' analysis criteria were set, and it was derived by 'the number of facilities per 1,000 population by township' using population data and rural space data. And the trend of each service sector was identified and implications were derived with 89 cities and counties in 'depopulation areas' suggested by the Ministry of Public Administration and Security. The derived implications are as follows. In the medical, leisure, and sports infrastructure sectors, 'rural areas with few service facilities per unit population' and 'depopulated areas' tended to coincide. In addition, the distribution characteristics of rural and urban areas differed by sector, which is judged to depend on the inclusion of rural facilities and population density.

• 대한의생명과학회지
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• 제23권2호
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• pp.133-137
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• 2017

Periodontitis is the major causation of tooth loss in the elderly population. Multiple risk factors include oral microorganisms, smoking, metabolic syndrome, and genetic factors influence periodontitis development. In this study, we conducted a replication study of using previous Korean GWAS results by examining an independent population. The study population was recruited from Mir Dental Clinic, Daegu, Korea. In total, 93 samples were evaluated from July 2016 to January 2017. The sample groups include relatively older patients (>60 years) with no periodontitis (n = 31) and relatively younger patients (range 40~60 years) with severe periodontitis (n = 62). A total of seven markers which were previously reported to be associated with periodontitis were genotyped. Among the seven SNPs, rs16846206 and rs2392510 showed a significant association by logistic regression analysis and Chi square test, respectively. The former SNP showed significant association with severe periodontitis, whereas this study also showed same tendency in which individuals with the minor allele are significantly more frequent in cases than those in controls. The SNP is located on a coding gene (SLC9C2), where the alanine residue 505 is replaced by glycine (Ala505Gly). The later SNP was significant when differed between case and control groups, but there was no significance by logistic regression analysis when controlled for age and sex as covariant. Although the study population size examined in the current study was relatively smaller compared to previous studies, our results implicated that at least the two SNPs (rs16846206 and rs2392510) might be important candidates for the further genetic study.

• 산업경영시스템학회지
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• 제20권44호
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• pp.69-79
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• 1997

We investigate both of central and dispersion tendencies of the observed test statistics in control charts in order to judge whether a production process is abnormal or not. In order to do it, first, we study about detection of changes of the population mean as a central tendency The $\bar{x}$ and x control charts are used for detecting the change of the population mean $\mu$. We shows the probability detecting the change of population mean using the $\bar{x}$ and x control charts. Secondly, we study about detection of changes of the population standard deviation as a dispersion tendency in the s control chart. In our studies, for the given several parameters the detection probabilities of changes of central and dispersion tendencies are calculated, the necessary sample size values n are suggested for detecting the changes, and their informations are given as various tables.

• Animal Systematics, Evolution and Diversity
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• 제29권1호
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• pp.18-22
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• 2013

A recent study on the mitochondrial genetic variation of the Carassius auratus population in South Korea suggested that there are 3 distinct mitochondrial lineages in the country, and that they are geographically separated between westward rivers and southward rivers, respectively. In this study, the population genetic structure of amplified fragment length polymorphism (AFLP) of Carassius auratus was investigated. The results of analysis of molecular variance (AMOVA) supported the geographic distinction between westward and southward river populations, but only 3.66% of total genetic variance lies among these populations. The panmicticity of the AFLP genetic variation is backed up by the results of the neighbor-joining dendrogram drawn from a linearized pairwise $F_{ST}$ matrix and Bayesian clustering analysis. The discordance of genetic structure between mitochondrial and AFLP genetic variation may come from difference in effective population size between these markers and/or gene flow between westward and southward river populations through river capture events.