• 한국물환경학회지
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• 제20권6호
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• pp.703-707
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• 2004

In this study, a simple regression model is proposed in order to analyse the effect of population and urban land use on the water quality of Paldang lake, Gyeonggi. As a comparison result with Qua12E water quality model, the proposed model shows very good predicting performance in simulating several alternative scenarios. In order to accomplish BOD 1ppm of Paldang lake, various model applications show that the population incoming and urban land use management should be afoot in addition to stricter outflow water quality from sewer treatmement systems.

• 농촌계획
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• 제29권3호
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• pp.15-24
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• 2023

The sense of crisis regarding regional extinction due to low birth rates and an aging population is expanding. Generally, the local extinction index is used to analyze local extinction. However, it is challenging to diagnose the actual situation of village extinction risk in rural areas, even though the regional extinction index can be analyzed in units such as Si-Gun-Gu and Eup-Myeon-Dong. This difficulty arises because the regional extinction index solely relies on natural population growth indicators (elderly population and female population aged 20-39). Therefore, the purpose of this study is to develop a village extinction index that can identify the disappearance of rural villages. Additionally, the aim is to apply the developed indicators to the village (administrative ri) spatial unit. The existing regional extinction index used only mortality-related indicators as factors for natural population decline and fertility-related indicators as factors for natural population growth. However, the developed village extinction index included not only the factors of natural population change but also incorporated social population growth factors and factors related to the pace of village extinction. This is the key difference between the developed village extinction index and the existing regional extinction index. In this study, the indicators of "total population," "number of young women aged 20-44," "number of elderly population aged 70 or older," and "number of incoming population" were selected to develop a village extinction index. The village extinction index was developed by incorporating both natural population growth indicators and social population growth indicators. The developed village extinction index was applied to administrative villages. This research is expected to provide a more accurate understanding of the current state of rural villages facing extinction.

• KIEAE Journal
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• 제17권1호
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• pp.29-36
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• 2017

Purpose: Residential differentiation is often considered to be one of the social problems that intensify urban inequality. The purpose of the study was to analyze the changes in the Gwangju urban landscape due to foreign inflows after reviewing the different frameworks about the causes of residential segregation and verifying compliance through case analysis. Method: This study analyzed the increase of Gwangju Foreign Population based on the data of the Statistics Korea and derived the concentrated areas of foreign population using GIS program. Then through the field research around the target areas, the changes of urban landscape by the foreign residents was analyzed. The foreign population in Korea recently surpassed 1.5 million is expected to increase further, and has already raised numerous social issues especially in urban area. Result: Therefore, basic and systematic analyses on foreign population and its impacts on urban residential landscape are necessary to resolve the issues. Since Gwangju is also in a similar situation, this research is first, to address the current situation and identify the problem, and then to suggest the directions for resolving them. It is also expected to be helpful provide a basic reference for related further researches.

• 경영과학
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• 제19권2호
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• pp.169-178
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• 2002

The growth of Internet usage even accelerated by the spread of high-speed Internet access network such as ADSI is affecting our socioeconomic activities and culture in a great way. Korea is recently reported to be the number one high-speed Internet network subscription per 100 people in the world. In a way to reflect this situation, we collect a moderate size of sample proportional to the population of each region across country and investigate what factors might explain the level of user's dissatisfaction with respect to Internet service they have been receiving. The results indicate that the set of gender, age, Internet usage, service kinds, incoming e-mails, and e-shopping is significantly influencing user's dissatisfaction, in that dissatisfaction is measured in 11 perspectives. In particular, user's age, gender, and e-shopping experiences are considered to be mostly explainable.

• 한국멀티미디어학회논문지
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• 제5권3호
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• pp.307-315
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• 2002

인터넷 사용자의 증가로 전자 메일은 여러 형태의 미디어를 지원하게 되었고, 멀티미디어 데이터를 포함한 전자 메일의 크기는 점점 더 커지고 있다. 더욱이, 이러한 멀티미디어 전자 메일은 모바일 장치들을 포함한 여러 통신 단말을 통해서 이용되어지고 있다. 본 논문의 주된 목적은 메일 서버의 저장 용량과 사용자 처리 측면에서 고성능과 확장성을 제공하는 효과적인 메일 서버를 설계하고 구현하는데 있다. 따라서 본 논문은 외부에서 들어오는 메일 메시지를 IP 주소 포워딩을 이용해 여러 메일 서버 노드로 분산하는 부하분산-노드를 가진 클러스터 기반의 메일 서버 구조를 제안한다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 춘계학술대회 논문집
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• pp.630-631
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• 2009

Recent developments such as concern over global warming, depletion of fossil fuels and increase in energy demands by the increasing world population has eventually lead to mass production of electricity using renewable sources. Apart from wind and solar, ocean holds tremendous amount of untapped energy in forms such as geothermal vents, tides and waves. The current study looks at generating power using waves and the focus is on the primary energy conversion (first stage conversion) of incoming waves for two different models. Observation of flow characteristics, pressure and the velocity in the augmentation channel as well as the front guide nozzle are presented in the paper. A numerical wave tank was utilized to generate waves of desired properties and later the turbine section was integrated. The augmentation channel consisted of a front nozzle, rear nozzle and an internal fluid region representing the turbine housing. The analysis was performed using the commercial CFD code.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.594-599
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• 2009

Recent developments such as concern over global warming, depletion of fossil fuels and increase in energy demands by the increasing world population has eventually lead to mass production of electricity using renewable sources. Apart from wind and solar, ocean holds tremendous amount of untapped energy in forms such as geothermal vents, tides and waves. The current study looks at generating power using waves and the focus is on the primary energy conversion (first stage conversion) of incoming waves for different models. Observation of flow characteristics and the velocity in the augmentation channel as well as the front guide nozzle are presented in the paper. A numerical wave tank was used to simulate the waves and after obtaining the desired wave properties; the augmentation channel plus the front guide nozzle and rear chamber were integrated to the numerical wave tank. The waves in the numerical wave tank were generated by a piston type wave maker which was located at the wave tank inlet. The inlet which was modeled as a plate wall moved sinusoidally with the general function, x=asin$\omega$t The augmentation channel consisted of a front nozzle, rear nozzle and an internal fluid region representing the turbine housing. The analysis was performed using the commercial CFD code ANSYS-CFX.

• 천문학회보
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• 제43권2호
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• pp.42.1-42.1
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• 2018

Collisionless shocks with low sonic Mach numbers, M<4, are expected to accelerate cosmic ray (CR) protons via diffusive shock acceleration (DSA) in the intracluster medium (ICM). However, observational evidence for CR protons in the ICM has yet to be established. Performing particle-in-cell simulations, we study the injection of protons into DSA and the early development of a nonthermal particle population in weak shocks in high ${\beta}$ plasmas. Reflection of incident protons, self-excitation of plasma waves via CR-driven instabilities, and multiple cycles of shock drift acceleration are essential to the early acceleration of CR protons in supercritical quasi-parallel shocks. We find that only in ICM shocks with $M{\geq}2.3$, a sufficient fraction of incoming protons are reflected by the overshoot in the shock electric potential and magnetic mirror at locally perpendicular magnetic fields, leading to efficient excitation of magnetic waves via CR streaming instabilities and the injection into the DSA process. Since a significant fraction of ICM shocks have M < 2.3 CR proton acceleration in the ICM might be less efficient than previously expected. This may explain why the diffuse gamma-ray emission from galaxy clusters due to proton-proton collisions has not been detected so far.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제4권6호
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• pp.197-204
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• 2015

고령화와 만성질환의 만연 등으로 인한 헬스케어환경의 급격한 변화는 착용형 인체센서, 무선네트워크 및 스마트폰이 결합한 새로운 적용영역을 창출하고 있다. 본 연구는 예외 관리적 관점에서 재택환자의 일상의 건강상태를 효과적으로 모니터링하며, 재택환자는 스마트폰을 활용한 건강모니터링을 통해 자기관리 및 적절한 건강 개입을 할 수 있는 시스템을 제공함으로써 새로운 의료서비스를 창출할 수 있는 기반을 제공하였다. 특히 기존 연구에서는 스마트폰이 단지 데이터 전달자로서의 역할에 그친 데 반하여, 본 연구에서는 스마트폰의 컴퓨팅 기능을 활용하여 의료인의 재택환자 일상생활 관리를 위한 데이터가공, 모니터링 시스템의 핵심인 필터링과 큐잉 등의 전처리과정을 구현함으로써 시스템의 효율성을 높였고, 환자 스스로의 자기관리를 위한 UX 디자인을 제시하였다. 제안 시스템의 성능을 검증하기 위해 총 94,467건의 실제 임상 데이터를 수집하여 제안시스템을 테스트한 결과 전체 대비 64.8%가 필터링 되는 등 높은 효율성이 검증되었다.

• 한국콘텐츠학회논문지
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• 제20권5호
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• pp.585-594
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• 2020

2006년 제주특별자치도 출범 이후 여러 개발사업이 진행된 제주는 유입인구 증가 등의 영향으로 2011년 이후 여타 지역에 비해 부동산업이 성장하였다. 이러한 성장 이후에 2017년부터는 미분양주택 증가, 순유입인구 감소 등의 현상이 나타나고 있다. 본 연구에서는 2006년부터 2016년의 기간을 회복기(2006~2010년)와 확장기(2011~2016년)로 구분하여 변이할당분석과 성장률시차분석을 통해 제주 부동산업의 성장이 국가의 성장에 따른 영향인지, 지역의 산업구조와 경쟁력에 의한 것인지를 분석하였다. 분석결과 제주 부동산업의 매출액과 종사자수는 회복기에는 국가 성장의 영향에 의해 성장하였으나, 확장기에는 산업구조와 지역의 경쟁력에 의해 성장한 것으로 나타났다. 부동산업의 성장에 기여한 세부산업으로는 부동산 개발 및 공급업을 들 수 있으며, 경쟁력이 약화된 세부산업으로는 부동산관리업으로 나타났다.