• 한국경제지리학회지
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• 제20권3호
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• pp.405-418
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• 2017

본 연구에서는 서울시 장기전세주택(SHIFT 이하 시프트)이 주변 아파트의 전세가격에 미치는 영향을 분석했다. 시프트 공급단지 5km 이내에 위치한 아파트들의 전세 실거래가 데이터를 이용하여, 시프트로 인한 주변 아파트 전세가격의 변화를 추정했다. 주요 결과는 다음과 같다. 첫째, 시프트 공급 이후 2-3km 이내 아파트들의 전세가격은 공급 이전을 기준으로 4.4% 하락했다. 반면 그 보다 근접한 1-2km 이내 위치한 아파트의 전세가격은 유의미한 변화를 확인할 수 없었다. 그 이유는 시프트 단지의 공급으로 주변지역이 함께 개발되면서 아주 근접한 아파트들의 경우 시프트 공급으로 인한 가격하락 요인을 입지환경 개선으로 인한 가격상승 요인이 상쇄한 것으로 해석된다. 시프트 단지별 분석에서는 천왕2지구1단지와 서초네이처힐 1, 3, 6단지에서는 주변 아파트 전세가격을 하락시키는 효과가 나타났다. 그러나 양재1단지, 묵동리본타워, 신내3지구2단지에서는 유의미한 효과를 확인할 수 없었다. 단지별 효과가 상이한 이유는 해당 지역의 전세수요와 시프트 공급물량 등의 차이로 인한 결과로 판단된다.

• 대한산업공학회지
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• 제32권3호
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• pp.210-218
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• 2006

Traditional statistical process control (SPC) applied to discrete part industry in the form of control charts can look for and eliminate assignable causes by process monitoring. On the other hand, engineering process control (EPC) applied to the process industry in the form of feedback control can maintain the process output on the target by continual adjustment of input variable. This study presents controlling and monitoring rules adopted by variable sampling interval (VSI) to change sampling intervals in a predetermined fashion on the predicted process levels under integrated EPC and SPC systems. Twelve rules classified by EPC schemes(MMSE, constrained PI, bounded or deadband adjustment policy) and type of sampling interval combined with EWMA chart of SPC are proposed under IMA (1,1) disturbance model and zero-order (responsive) dynamic system. Properties of twelve control rules under three patterns of process change (sudden shift, drift and random shift) are evaluated and discussed through simulation and control rules for integrated VSI EPC and SPC systems are recommended.

• 한국사회복지학
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• 제69권2호
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• pp.9-30
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• 2017

체제의 전환은 정책의 변화나 정부의 교체보다는 덜 자주 발생한다. 사회경제 연합, 정치경제 제도, 공공정책의 양상이라는 체제를 구성하는 세 가지 요소 모두의 변화가 이루어질 때 체제의 전환은 가능하다. 이 연구는 한국 생활보장체제의 전환 가능성이 상당히 높은 지금의 시점에서 필요한 과제를 모색하는 것을 목적으로 한다. 이를 위해 2절에서는 한국 생활보장체제의 전개과정과 특성을 필자의 선행연구들에서 주장한 '개발국가형 생활보장체제'의 관점에서 살펴보았다. 3절에서는 한국 생활보장체제의 전환을 위해 필요하다고 생각하는 3가지의 과제를 제시하였는데, 그것은 정치제도의 개혁, 재정지출 구조의 개혁, 그리고 비공식 취업의 축소 등이다. 이러한 과제들은 사회경제 연합의 변화와 새로운 정치경제 제도의 등장을 요구한다는 점에서 체제전환과 관련한 정책적 과제이다. 한편, 4절에서는 한국 사회복지의 새판 짜기와 관련하여 우리 학문 공동체에 붙여보고 싶은 두 가지의 토론거리를 결론을 대신하여 제기하였다.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.123.2-123.2
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• 2010

Fuel Cell cogeneration system is a promising technology for generating electricity and heat with high efficiency of low pollutant emission. We have been developed 5kW class fuel cell cogeneration system for commercial and residential application. The fuel processor is a crucial part of producing hydrogen from the fossil fuels such as LNG and LPG. The 5kW class high efficiency fuel processor consists of steam reformer, CO shift converter, CO preferential oxidation(PrOx) reactor, burner and heat exchanger. The one-stage CO shift converter process using a metal oxide catalyst was adopted. The efficiency of 5 kW class fuel processor shows 75% based on LHV. In addition, for the purpose of continuous operation with load fluctuations in the commercial system for residential use, load change of fuel processor was tested. Efficiency of 30%, 50%, 70% and 100% load shows 75%, 75%, 73% and 72%(LHV), respectively. Also, during the load change conditions, the product gas composition was stable and the outlet CO concentration was below 5 ppm. The Fuel processor operation was carried out in residential fuel cell cogeneration system with fuel cell stack under dynamic conditions. The 5kW class fuel processor have been evaluated for long-term durability and reliability test including with improvement in optimal operation logic.

• Bulletin of the Korean Chemical Society
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• 제12권5호
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• pp.574-582
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• 1991

The CO molecules adsorbed on Ni(111) surface is studied in the cluster approximation employing EH method with self-consistent charge iteration. The effect of CO coverage is simulated by allowing the variation of valence state ionization potentials of each Ni atom in model cluster according to the self-consistent charge iteration method. The CO coverage dependent C-O stretching frequency shift, adsorption site conversion, and metal work function change are attributed to the charge transfer between metal surface and adsorbate. For CO/Ni(111) system, net charge transfer from Ni surface to chemisorbed CO molecules makes surface Ni atoms be more positive with increasing coverage, and lowers Ni surface valence band. This leads to a weaker interaction between metal surface valence band and Co $2{\pi}^{\ast}$ MO, less charge transfer to a single CO molecule, and the bule shift of C-O stretching frequency. Further increase of coverage induces the conversion of 3-fold site CO to lower coordination site CO as well as the blue shift of C-O stretching frequency. This whole process is accompanied by the continuous increase of metal work function.

• 한국항만경제학회지
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• 제31권4호
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• pp.169-187
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• 2015

항만은 물류산업의 중심 및 공업 활동의 중요기지로 사회 경제 발전에 적극적으로 기여하고 있다. 본 연구는 중국 10대 컨테이너항만의 2000년부터 2014년까지의 물동량 데이터를 중심으로 지니계수 및 변이 할당 기법을 이용하였고 항만집중도의 변화와 물동량의 이동을 분석하여 중국 항만시스템 발전 단계를 제시하는 데 목적이 있다. 본 연구결과는 다음과 같이 요약된다. 첫째, 컨테이너항만 체계의 중심이 북방으로 뚜렷하게 이동하는 것이다. 변이할당기법 분석 결과에 따라 3개 지역의 물동량이 주강삼각주 지역으로부터 다른 두 지역으로 이동하여 중국 컨테이너항만 체계 중심이 북방으로 이동하는 것으로 나타났다. 둘째, 컨테이너항만 분산화 발전은 컨테이너 물동량 공간 구조 변화의 주요한 요인으로 작용하였다. 지니계수의 계산한 결과 분산화 발전은 중국 컨테이너 항만체계 공간변화에서 뚜렷해지고 있는 추세이다.

• 한국태양에너지학회 논문집
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• 제33권3호
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• pp.9-16
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• 2013

In this research, the effect of a heating system, which is powered by direct solar energy accumulated in phase change material (PCM) as heat storage material installed on the floor surface, on the cooling load was studied. Cooling load of a test building designed for this research was measured with fan coil unit and factors affecting it were also estimated. Experiments were performed with and without PCM installed on the building floor to understand the effect of the PCM on the cooling load. Additionally, to confirm the experiments results, the prediction calculation formula by average outside temperature and integrated solar radiation was composed using multivariate regression model. The results suggested that the heating system with PCM on the floor surface has the potential to shift electric power peak by radiating heat, stored during the daytime in it, at night, not increasing the total cooling load much.

• 한국환경복원기술학회지
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• 제9권5호
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• pp.32-40
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• 2006

This study's objects are to suggest effective forest community-level management measures by identifying the vulnerable forest vegetation communities types to climate change through a comparative analysis with present forest communities identified and delineated in the Actual Vegetation Map. The methods of this study are to classify the climatic life zones based on the correlative climate-vegetation relationship for each forest vegetation community, the Holdridge Bio-Climate Model was employed. This study confirms relationship between forest vegetation and environmental factors using Pearson's correlation coefficient analysis. Then, the future distribution of forest vegetation are predicted derived factors and present distribution of vegetation by utilizing the multinomial logit model. The vulnerability of forest to climate change was evaluated by identifying the forest community shifts slower than the average velocity of forest moving (VFM) for woody plants, which is assumed to be 0.25 kilometers per year. The major findings in this study are as follows : First, the result of correlative analysis shows that summer precipitation, mean temperature of the coldest month, elevation, soil organic matter contents, and soil acidity (pH) are highly influencing factors to the distribution of forest vegetation. Secondly, the result of the vulnerability assessment employing the assumed velocity of forest moving for woody plants (0.25kmjyear) shows that 54.82% of the forest turned out to be vulnerable to climate change. The sub-alpine vegetations in regions around Mount Jiri and Mount Seorak are predicted to shift the dominance toward Quercus mongolica and Pinus densiflora communities. In the identified vulnerable areas centering the southern and eastern coastal regions, about 8.27% of the Pinus densiflora communities is likely to shift to sub-tropical forest communities, and 3.38% of the Quercus mongolica communities is likely to shift toward Quercus acutissima communities. In the vulnerable areas scattered throughout the country, about 8.84% of the Quercus mongolica communities is likely to shift toward Pinus densiflora communities due to the effects of climate change. The study findings concluded that challenges associated with predicting the future climate using RCM and the assessment of the future vulnerabilities of forest vegetations to climate change are significant.

• 한국초등과학교육학회지:초등과학교육
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• 제36권3호
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• pp.286-301
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• 2017

Nowadays, the public as well as science educators pays much attention to the fourth industrial revolution and wonders what will happen to the societies in the future. Thus, this study aimed at predicting the education environment which will be brought from the fourth industrial revolution, and suggesting the solutions or tasks to be investigated in science education. Through the literature review, this study categorized the major changes of future society into a wild fluctuation of job market, the shift from possession-based economy to sharing economy, post-urbanized and distributed system, and the crisis of dehumanization. According to the four major changes, this study predicted the future environment that will occur to the educational system. First, the students should the competences necessary for the future and the school curriculum will be changed in terms of width and depth. Second, sharing economy may bring about the open platform similar to MOOC (Massive Open Online Course) or TED. Third, the manifestation of artificial intelligence in education will enable the individual and paced learning, and thanks to the change, the concept of distributed cognition will be more focused in education research. Fourth, the collaborative learning and character education should be more stressed to resist the dehumanization. This study suggests relevant tasks and issues that should be tackled for the successful change in primary and secondary schools.

• Asian Journal of Innovation and Policy
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• 제9권2호
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• pp.145-163
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• 2020

The COVID-19 is a pandemic that affects all facets of our life and will change many patterns in science technology and innovation. A qualitative study was conducted using Focus Group Interview involving ten industry-academia-research experts with the objective of identifying changes in Korea's national innovation system and science & technology policy after the COVID-19. Eight questions were designed, based on the major components of the national innovation system, such as companies, universities, and research institutes, to discuss the changes in the national innovation system and science & technology policy. Also, keyword analysis and cluster analysis were performed using the network analysis program VOSviewer. It is predicted that, in the wake of the COVID-19, Korea's national innovation system will shift to a new paradigm that is more decentralized, responsive, and autonomous. Furthermore, several policy agendas that can turn these changes into positive momentum of change in science & technology policy are presented.