• 노동경제논집
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• 제42권4호
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• pp.1-29
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• 2019

이 연구는 장래의 우리나라 여성(25~54세) 경제활동참가율이 미국이나 일본의 역사적 경험을 따라 변화하는 경우 최근(2018년)의 경제활동참가율이 유지되는 경우에 비해 2065년까지 여성경제활동인구가 어떻게 변화하는지를 추정하였다. 결과에 따르면 미국이나 일본의 역사적 사례에 기초한 시나리오가 실현되는 경우 25~54세 여성 경제활동인구가 2042년까지 각각 약 14%(약 797,000명) 및 15%(약 831,000명) 더 늘어날 것으로 예상된다. 특히 현재 경력단절현상이 심한 30대와 40대 초반 여성경제활동인구가 큰 폭으로 증가할 것으로 전망된다. 이 연구의 결과는 비교적 가까운 장래에 인구변화로 인한 전체경제활동인구 감소효과가 크지 않을 것임을 시사한다. 일본의 사례를 적용한 시뮬레이션 결과는 여성 경제활동을 증가시키기 위한 정책적인 노력이 인구구조변화가 노동시장에 미칠 것으로 우려되는 잠재적인 영향에 대응하는데 있어서 적어도 가까운 장래에 있어서는 장년고용을 증가시키기 위한 노력에 비해 효과적이라는 것을 보여준다.

• 한국인구학
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• 제24권1호
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• pp.5-40
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• 2001

농촌사회의 변화를 사회 구성원인 인구와 원초제도인 가족의 변화를 중심으로 접근하였다. 연구지역은 청주시로 출퇴근이 가능한 충북 청원군 옥산면의 2개리 (근교농촌)와 도시와 접하지 않은 충북 보은군의 2개리(일반농촌)를 선정하였다. 농촌사회의 변화를 측정하기 위하여 연구지역에서 1995-1996년의 1차 조사와 1999-2000년의 2차조사를 실시하였다. 조사원에 의한 면접전수조사이므로 연도 및 지역별 조사결과를 직접 비교하였다. 일반농촌의 경우 성.연령별 인구구조는 전형적인 역삼각형을 그리고 있으며, 이 현상은 지속적인 젊은 연령층의 전출로 더욱 심화되고 있다. 젊은 연령층의 자녀세대가 도시로 이주하고, 새로운 가족형성이 이루어지지 않고, 노 부모세대만 잔류하다가 노령으로 사망하게 되면 기존 가족의 해체와 더불어 농촌의 지역사회 자체의 존속이 어려워 진다. 한편 근교농촌의 경우에도 노령화 현상이 나타나지만 청장년층에서 전출과 전입이 교차하고 있다. 그러므로, 주로 농업에 종사하는 원주민 세대의 노령화가 진행되면서 농촌의 전통적 특성이 감소하는 대신 비농업에 종사하는 젊은 연령층의 전입으로 중간 연령층을 형성하게 되므로 앞으로 도시 특성이 강한 새로운 지역사회로 변모할 것이다.

• 식물병연구
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• 제7권1호
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• pp.25-30
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• 2001

인삼 뿌리썩음병의 발생을 경감시키기 위한 효과적인 담수조건을 확립하기 위해, 실험실 조건에서 인삼 재작지토양을 공시하여 인위적으로 담수처리하고, 담수전 유기물의 첨가 여부 및 담수후 처리온도가 토양내 Fusarium 을 비롯한 사상균과 세균 밀도에 미치는 영향을 조사하였다. 담수처리를 하였을 때 토양내 Fusarium 및 총사상균 밀도는 시일이 경과할수록 감소하였고, 담수에 의한 균밀도 감소효과는 온도가 높을수록 증가하였고, 또한 동일 온도조건에서 유기물을 첨가하였을 경우에는 그 효과가 더욱 증대하였다. 즉, 3$0^{\circ}C$ 조건에서 유기물을 첨가하지 않았을 경우 처리 60일후의 균밀도가 무담수 토양의 1/10 수준으로 감소하였던 반면, 유기물을 첨가하였을 경우에는 1/100 수준으로 감소하였다. 유기물 종류별로는 볏짚 처리효과가 청초에 비해 더 높았다. 한편 담수토양에서 총세균의 밀도변화 경향은 사상균의 경향과 유사하였으나, 담수에 의한 세균밀도 감소효과는 사상균에 비해 낮았다. 이상의 결과에서 인삼재작지 토양에 유기물을 첨가하고 포화상태로 담수한 후 3개월 이상 수온을 3$0^{\circ}C$이상 유지할 경우 뿌리썩음병 발생을 보다 경감시킬 수 있을 것으로 사료된다.

• The Korean Journal of Ecology
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• 제21권3호
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• pp.187-193
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• 1998

Seasonal changes of nitrogen fixation and growth characteristics of Melilotus suaveolens population under different light conditions were quantitatively analyzed during growting period. Height growth of M. suaveolens population was promoted after April and the shade (site 2) showed 10-20% increase of height growth in compared with that of sunny (site 1). Seasonal changes of biomass were in creased after March, the biomass at site 1 attained 78.5% that of site 2 in May. Chlorophyll content was maintained high value from March to April but, Chlorophyll content of leaf at site 1 was decreased 11.7% compared to that of site 2 in May. The nitrogen content of each organ of M. suaveolens showed higher value in March and then decreased, the high nitrogen contents of reproductive organ were achieved at the flowering stage at site 1. The root nodule of M. suaveolens population appeared in March and showed maximum value in early June and decreased remarkably after July, the amount of nodule formation of M. suaveolens at site 2 showed higher than that of site 1. The nitrogen fixation activity of root nodule of M. suaveolens initiated with shoot growth and showed maximum value in mid April, and attained second peak in early June and then decreased after July. The total nitrogen fixation of the plant showed higher value at site 2 than that of site 1. From the overall results, M. suaveolens showed increased growth under half-shady, well ventilated barren soil than fertile sunny site.

• Asian Pacific Journal of Cancer Prevention
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• 제17권9호
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• pp.4451-4456
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• 2016

Background: In this study, we examined epidemiological aspects of dynamic changes in incidences of laryngeal cancer in male and female populations in Kazakhstan. Materials and Methods: Primary data were for registered patients with malignant laryngeal tumors in the whole country during the period of 1999-2014. Evaluation of changes in laryngeal cancer incidence in the population of Kazakhstan was performed using component analysis. Results: It was determined that the number of patients with laryngeal cancer in the whole country is decreasing although with conflicting impacts of different factors. Despite population growth (all - ${\Delta}_P=+66.1%$, men - ${\Delta}_P=+70.9%$ and women - ${\Delta}_P=+46.4%$), and aging (all - ${\Delta}_A=+45.1%$, men - ${\Delta}_A=+54.3$ and women - ${\Delta}_A=+22.2$), the reduction in risk of developing the disease (all - ${\Delta}_R=-165.6%$, men - ${\Delta}_R=-170.9%$ and women - ${\Delta}_R=-141.0%$) was overwhelming. Conclusions: This investigation was the first epidemiological study of dynamics of laryngeal cancer by component analysis in population of Kazakhstan. Implementation of the results of the study is recommended in management of anti-cancer activities for laryngeal cancer.

• Journal of Ginseng Research
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• 제9권1호
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• pp.15-23
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• 1985

The study was carried out to confirm the changes of soil physico-chemical properties and population of Fusarium solani by soil managements at preplanning fields for ginseng cultivation. Soil porosity and aggregation had been significantly increased during the managements while exchangeable nitrogen content and bulk density of the soil had been decreased. Available phosphate and exchangeable potassium content, in addition, seemed to be slightly increased. And soil aggregation showed positive correlation with clay, organic matter, soil moisture, and Ca content in the soil but negative with K content. Decrease rate of NH4-N and NO3-N content after soil managements were 55% and 41% in average, respectively. And better decrease effect for NH4-N was obtained in sand loam soil whereas no effect for NO3-N with soil textures. The more ploughing seemed to result in less propagules of F solani in the soil, however there was non significant decrease in population of the pathogen after the soil management. Number of F. solani in soil was significantly less in the fields where gramineous and leguminous crops had been grown as a precrop than other crops tested. Meanwhile there was no correlation between soil texture and population of the pathogen in the soil.

• The Plant Pathology Journal
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• 제24권3호
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• pp.352-356
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• 2008

Root discs of 4-year-old ginseng, Panax ginseng C. A. Meyer, were inoculated with the higher($10^8$ colonyforming units(CFU)/ml) and lower($10^6\;or\;10^5$ CFU/ml) initial inoculum levels of a plant-growth promoting rhizobacterium(PGPR), Paenibacillus polymyxa GBR-1 to examine rot symptom development and bacterial population changes on the root discs. At the higher inoculum level, brown rot symptoms developed and expanded on the whole root discs in which the bacterial population increased continuously up to 4 days after inoculation. In light and electron microscopy, ginseng root cells on the inoculation sites were extensively decayed, which were characterized by dissolved cell walls and destructed cytoplasmic contents. However, no rot symptoms were developed and the bacterial population increased only during the initial two days of inoculation at the lower inoculum level($10^6$ CFU/ml) of P. polymyxa GBR-1. At the lower inoculum level($10^5$ CFU/ml), boundary layers with parallel periclinal cell divisions, structurally similar to wound periderm, were formed internal to the inoculation sites, beneath which the cells were intact containing numerous normal-looking starch granules and no disorganized cell organelles, suggesting that these structural features may be related to the suppression of symptom development, a histological defense mechanism.

• 한국환경보건학회지
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• 제39권1호
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• pp.19-31
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• 2013

Objectives: Elevated temperatures during summer months have been reported since the early 20th century to be associated with increased daily mortality. However, future death impacts of high temperatures resulting from climate change could be variously estimated in consideration of the future changes in historical temperature-mortality relationships, mortality, and population. This study examined the future death burden of high temperatures resulting from climate change in Seoul over the period of 2001-2040. Methods: We calculated yearly death burden attributable to high temperatures stemming from climate change in Seoul from 2001-2040. These future death burdens from high temperature were computed by multiplying relative risk, temperature, mortality, and population at any future point. To incorporate adaptation, we assumed future changes in temperature-mortality relationships (i.e. threshold temperatures and slopes), which were estimated as short-term temperature effects using a Poisson regression model. Results: The results show that climate change will lead to a substantial increase in summer high temperature-related death burden in the future, even considering adaptation by the population group. The yearly death burden attributable to elevated temperatures ranged from approximately 0.7 deaths per 100,000 people in 2001-2010 to about 1.5 deaths per 100,000 people in Seoul in 2036-2040. Conclusions: This study suggests that adaptation strategies and communication regarding future health risks stemming from climate change are necessary for the public and for the political leadership of South Korea.

• Food Science and Biotechnology
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• 제27권6호
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• pp.1865-1869
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• 2018

This study examined the effects of alfalfa seed germination on growth of Salmonella enterica. We investigated the population changes of S. enterica during early sprout development. We found that the population density of S. enterica, which was inoculated on alfalfa seeds was increased during sprout development under all experimental temperatures, whereas a significant reduction was observed when S. enterica was inoculated on fully germinated sprouts. To establish a model for predicting S. enterica growth during alfalfa sprout development, the kinetic growth data under isothermal conditions were collected and evaluated based on Baranyi model as a primary model for growth data. To elucidate the influence of temperature on S. enterica growth rates, three secondary models were compared and found that the Arrhenius-type model was more suitable than others. We believe that our model can be utilized to predict S. enterica behavior in alfalfa sprout and to conduct microbial risk assessments.

• 식품보건융합연구
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• 제7권5호
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• pp.1-7
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• 2021

The aging of the population has a fundamental impact on the national economy, including decline in productive population, atrophy of available funds, slowdown of technological innovation, slowdown of economic growth, and decrease in vitality of society as a whole. Increase of elderly population would lead to increase in elderly welfare consumers, which would also lead to increase the demand for elderly welfare services. However, due to the continuation of the low birth rate, there is a great shortage of human resources who can handle this. In such a situation, the main goal of the elderly welfare system in the future should aim to actively try to design effective policies, prepare systems, and implement services for the problems of the aged society, and to find ways to expand the finances, manpower, methods, and facilities necessary for the welfare of the elderly. Elderly welfare services in Korea have been changed and developed in accordance with socioeconomic changes such as industrialization and urbanization. This study examines the changes in elderly welfare services in Korea by the flow of times and presents a method which utilizes artificial intelligence and Internet of Things in services for the elderly welfare consumers to improve both quality and efficiency.