• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.3
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• pp.129-134
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• 2020

Moisture infiltration inside the solar cell module, filling of EVA sheet, melting of the frame seal, and deterioration of power generation performance in the module one year after installation are occurring. Whitening phenomenon, electrode corrosion phenomenon, and dielectric breakdown phenomenon are appearing in solar cell module installed in Korea before 5-7 years, leading to deterioration of power generation performance, and big problems for long-term reliability and long life technology are emerging. Therefore, in order to solve these problems, the development of a micro inverter (MiCrco Inverter Converter, MiC) including the function of securing the durability of the solar cell module and monitoring the aging progress and the solar cell based on the monitoring data from the MiC smart monitoring programs have been proposed to determine the aging of modules. In addition, in order to become a highly efficient solar smart monitoring system through systematic operation management through IT convergence with MiC that has enhanced monitoring function of solar cell module, SoC(System On Chip) in micro inverter is the environment for solar cell module. There is a demand for functions that can detect information in a complex manner and perform communication and control when necessary. Based on these requirements, this paper aims to develop SoC-based low-cost MiC smart photovoltaic system technology.

• Korean journal of communication and information
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• v.81
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• pp.122-152
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• 2017

The media movement is a movement to separate from the political power and to dismantle the media power and to seek the control of citizens' media. Political power is the biggest factor that violates the fairness and independence of the media in the public domain. On the other hand, the factor that interferes with the healthy and responsible media of the press in the private sector is the media power originating from the owner. Citizens 'media campaign emphasizes citizens' mobility as a subject that monitors the political power and media power that have the sovereignty of the media belonging to the citizen and may infringe on this sovereignty.In the Lee Myung Bak - Park Geun Hye regime, the civil press movement was a period of resistance and struggle. Citizen media campaigns have completely collapsed with governance. As a result, the intellectuals who have expertise in the media have lost their place in the discussion and presentation of the policy alternatives in which the policy production is centered. The influence of citizen media organizations, which are centered on activists rather than citizen's direct action, is limited. In order to strengthen the power of the media reform, it is necessary to reconstruct social forces such as civil society, media unions, media organizations and political forces. We should also look for various ways in which citizens can participate actively in the agenda and activities of the movement. In addition, it is necessary to expand the movement of the media.

• Journal of Digital Convergence
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• v.15 no.6
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• pp.407-414
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• 2017

With an increase in urban crimes in various forms, this study is intended to analyze the effectiveness of the service design that presented a new model resolving crime risks through differentiated thinking paradigm and problem approaches. The empirical case addressed in this study is 'the project to create resident-driven safe community in Duryu-dong, Dalseo-gu, Deagu though service design'. This project is evaluated as having prepared a prevention-oriented local safety system through a preemptive and resident-centered process. The project was promoted as a 'natural monitoring capacity building program' for residents to prevent local crimes, a 'social role expansion program' for local safety, and 'crime prevention environment design', which provides comprehensive solutions for residents' safety. Here, designers act as exerts in designing a task-based platform that can be driven by residents rather than a visual environment improver, and reorganizing the local ecosystem by expanding the opportunities for residents to interact. This case identifies the role of service design as binding the solidarity of local residents beyond the improvement of the crime environment and giving them the potential capacity to maintain a safe living space in relation to a safety issues of community.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.1D
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• pp.149-155
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• 2011

The aim of this study is to grasp how the dwellers of apartment cognize the real condition of the management such as general control of janitor office or management of maintenance, environment, account and imposing price of management. The analysed results of recognition are as following. First, as the dwellers judged that the janitors are incapable to control dispute among the households, it needs to develop the ability to cope with the demand of control dispute by various curriculum. There should be more strict management of parking lot for the handicapped. Second, it needs to establish the plan to improve maintenance of the rest facility. Third, as dwellers thought the management expenses not to be made public clearly, it needs to use various way, not only by neighborhood meeting but also information system such as establishing web page or E-mail notice for better announcement of the settled matters such as management expenses. Forth, the audit result of management expenses and the measures conducted after audit should be reported widely, contract of construction work services needs to be publicized by neighborhood meeting or other information system.

• Journal of the Korea Society for Simulation
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• v.23 no.4
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• pp.31-39
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• 2014

Seasonal influenza epidemics cause 3 to 5 millions severe illness and 250,000 to 500,000 deaths worldwide each year. To prepare better controls on severe influenza epidemics, many studies have been proposed to achieve near real-time surveillance of the spread of influenza. Korea CDC publishes clinical data of influenza epidemics on a weekly basis typically with a 1-2-week reporting lag. To provide faster detection of epidemics, recently approaches using unofficial data such as news reports, social media, and search queries are suggested. Collection of such data is cheap in cost and is realized in near real-time. This research aims to develop regression models for early detecting the outbreak of the seasonal influenza epidemics in Korea with keyword query information provided from the Naver (Korean representative portal site) trend services for PC and mobile device. We selected 20 key words likely to have strong correlations with influenza-like illness (ILI) based on literature review and proposed a logistic regression model and a multiple regression model to predict the outbreak of ILI. With respect of model fitness, the multiple regression model shows better results than logistic regression model. Also we find that a mobile-based regression model is better than PC-based regression model in estimating ILI percentages.

• Journal of Distribution Research
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• v.15 no.5
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• pp.37-60
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• 2010

Department Stores have been in place as typical large-scale retailer in Korean retail market. After Asian financial crisis in 1997, the market share of major three department stores has been increased and they have had a dominant position in relationship with vendors or manufacturers. Thus, they are able to control sales commission. Sales commission is defined as things that department stores which contribute to products sales instead of manufacturers take some portion of price as their revenue. In other words, vendors or manufacturers pay some amount of money from their sales by contracted ratio to department stores. The problem is that vendors or manufacturers think that sales commission is high. However, department stores have a different opinion that sales commission is not high because they generate new value from gathering customers and doing marketing activity on behalf of vendors or manufacturers. Because department stores have operated with business model of renting sales space to vendors or manufacturers instead of buying goods directly from them, this situation has been taken place. The revenue of department stores depend on sales commission. Thus, they want to get a dominant power to control sales commission in relationship with vendors or manufacturers. So, they have tried to increase their size and brand power. The considered policies related in sales commission of department stores are as following: preventing monopoly or oligopoly of department store, being strength of monitoring for department stores' unfair trade, strict enforcement of law for large-scale retailer's unfair trade, and inducing win-win strategy doing voluntarily by department stores.

• Korean Journal of Clinical Laboratory Science
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• v.49 no.4
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• pp.420-426
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• 2017

Methicillin-resistant Staphylococcus (MRS) can be colonized in various body sites and is more frequently isolated in healthcare associated persons. This study aimed to evaluate the contamination rate of MRS in a high school environment, those living with closed life style. Staphylococcus aureus was isolated from only the hands of 2 students among a sample of 28 students, and S. aureus were susceptible to methicillin antibiotics. Coagulase negative Staphylococci (CoNS) were isolated from the hands of 26 students (26/28, 92.9%), and among them, 14 (53.8%) isolates were methicillin-resistant CoNS (MRCoNS). Among the 14 MRCoNS, S. warneri was the most common (8/14, 57%) and susceptible to most $non-{\beta}-lactam$ antibiotics, such as clindamycin, erythromycin, ciprofloxacin, tetracycline, gentamicin, and vancomycin. In a culture of 31 desks, S. aureus was not isolated but CoNS were isolated from 26 desks (26/31, 83.6%), which did not harbor the mecA gene. The other bacteria isolated from the hands and desks were Micrococcus and Bacillus spp. In conclusion, methicillin-resistant S. aureus was not isolated from the hands and desks of high school students. However, the frequency of MRCoNS harboring mecA gene were high in the hands of high school students. Therefore, to prevent and to control the transfer of infection, intensifying preventive education, such as hand washing, and active surveillance systems, such as an investigation of contamination or carrier rate of resistant bacteria are necessary.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.556-559
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• 2007

고탁수 장기화 문제를 해결하기 위한 방법으로는 고탁수층을 선택취수하여 우선 배제함으로써 하류하천의 고탁수 발생일수를 최소화하는 방법이 있는데, 이와 같은 선택적 취수기법은 저수지 운영에 있어서 고탁수층을 우선 배제한 후 홍수기 이후에 저수지내로 유입되는 청수를 담수하여 호소 내 탁도 저감 효과를 얻을 수 있다. 본 연구에서는 선택취수 시 성층수괴의 동수역학적 변화를 분석하기 위하여 국내에서 처음으로 Two-tank 기법을 이용하여 성층구조를 구현해 내었는데, 소금물의 밀도변화를 이용하여 수심 1m의 성층수조를 만들었고, 밀도경사가 상이한 성층구조에서 취수조건을 변화시키면서 비교란 유속계인 PIV 시스템을 이용해 유속의 흐름을 Vector와 Contour로 분석하였다. 선택취수에 대한 흐름의 동수역학적 분석결과 취수유량보다는 밀도성층경사 변화에 더 민감한 반응을 보였다. 취수유량을 줄이거나 밀도성층경사를 급하게 했을 때에는 선택취수 영역(withdrawal zone)의 수직방향 폭은 줄어드는 반면, X축으로의 영향범위는 증가함을 나타냈다. 취수유량을 증가시키거나 성층밀도경사를 완만히 했을 땐 선택취수 영역(withdrawal zone)의 수직방향 폭은 증가하였고 X축으로의 영향범위는 축소됨을 나타내었다. 이 결과는 Richardson 수로도 판단되어지는데, Richardson 수가 증가하면 유속에 비해 상대적으로 밀도성층경사가 크다는 것인데 이럴 경우 선택취수 영역(withdrawal zone)의 수직방향 폭 최대가 되고 선택취수 영역(withdrawal zone)의 수직방향 폭은 최소가 된다. 선택취수 영역(withdrawal zone)의 수직방향 폭이 최소가 되면 취수구 직경 D의 1.8배의 값을 가지고 Richradson 수가 최소가 되더라도 취수구 직경 D의 3.3배를 벗어나지 않는다는 결과를 도출할 수 있었다.링 목적으로 사용될 수 있다. 본 연구에서 개발한 영상수위계는 한강홍수통제소 관할의 전류, 청담대교 등 4개소 낙동강 홍수통제소 2개소, 지자체 등에 적용되었으며, 적용 결과 비교적 안정적이면서 정확하게 수위를 측정하는 것으로 나타났다. 한편 기존 CCD 카메라 이외에 CCTV를 이용한 영상수위계를 개발하여 영상의 화질 개선뿐 아니라 하천화상 감시 기능을 강화하였다.소류의 섭취율은 높았다. 집단간의 상관도를 보면 교육별로 김치, 장아찌, 콩이 각각 p>0.5 수준에서 유의한 차가 없었고, 나머지는 유의한 차가 있었다. 연령별로는 멸치가 유의한 차가 없었고(p>0.5), 수입별로는 콩이 유의한 차가 없었다(p>0.5). 4. 영양지식(營養知識) 검토 가정생활(家庭生活)에 필요(必要)한 일반적(一般的)인 영양지식(營養知識)은 대체적으로 낮은 편이었다. 어린이 영양, 편식의 해로움, 비만증의 해로움, 임신부 그리고 수유부 영양에 대하여는 일반적으로 알고 있다고 하였으며, 그다음으로 이유기 영양, 어린이 발육에 필요한 식품, 식품과 영양소와의 관계, 우유의 성분, 노인영양에 대하여 잘 알고 있는 비율이 낮았으며, 인체의 영양소, 식단작성여부, 간식의 이론, 식품감별법에 대하여는 가장 낮은 비율을 나타냈다. 각 영양지식은 교육정도가 높을수록 영양지식이 높았고, 교육별 집단간의 유의한 차가 나타났다. (0.001

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.532-536
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• 2007

급속한 도시화 및 지구온난화로 인한 집중호우로 홍수피해가 해마다 증가하고 있다. 홍수피해를 최소화하기 위하여 4대강 중심의 홍수예경보시스템이 구축되는 등 다양한 제도적 장치가 마련되고 있으나 중소하천이 분포되어 있는 도시유역에서의 홍수예측기능은 부족한 실정이다. 본 연구에서는 중소 도시하천에 적용 가능한 실시간 도시홍수예측서비스 시스템(Realtime Urban Flood Forecasting Service, U-FFS)을 개발하였다. 경기도 성남에 위치한 탄천을 대상유역으로 선정하고 실시간 강우 및 수위관측소를 설치하여 수문데이타를 수집하였으며 이를 바탕으로 수위예측모형을 구축하였다. 모형구축에는 이미 국내외 학계에서 그 정확도가 입증된 바 있는 Data-driven 모델의 일종인 ANFIS(Adaptive Neuro-Fuzzy Inference System)를 이용하였다. 개발된 수위예측모형은 지정된 시간에 자동으로 작동 가능한 실행파일로 프로그래밍되어 최종적으로 홍수예측 웹서비스와 연동된다. U-FFS는 집중호우 발생 시 최종 유출구의 30분, 1시간, 2시간 후의 수위 예측값을 웹 상을 통해 제공함으로써 언제 어디서나 홍수예측 정보를 누구나 손쉽게 획득할 수 있는 장점이 있다. 시범운영 결과, 30분 및 1시간 후의 수위 예측은 정확도가 매우 뛰어났으며 2시간 후의 수위 예측의 정확성은 다소 떨어지는 것으로 확인되었으나 전반적인 홍수예측 판단에는 무리가 없을 것으로 예상된다. 본 시스템의 홍수예측모형은 생성 및 수정이 간편하여 그 활용성이 매우 높을 것으로 기대된다. 특히 안전함을 지향하는 각종 U-City나 홍수피해가 빈번한 도시유역에 적용하면 기존 시스템과 차별화된 실시간 홍수예측 서비스가 가능해져 홍수피해를 최소화할 수 있을 것이다. 취수구 직경 D의 3.3배를 벗어나지 않는다는 결과를 도출할 수 있었다.링 목적으로 사용될 수 있다. 본 연구에서 개발한 영상수위계는 한강홍수통제소 관할의 전류, 청담대교 등 4개소 낙동강 홍수통제소 2개소, 지자체 등에 적용되었으며, 적용 결과 비교적 안정적이면서 정확하게 수위를 측정하는 것으로 나타났다. 한편 기존 CCD 카메라 이외에 CCTV를 이용한 영상수위계를 개발하여 영상의 화질 개선뿐 아니라 하천화상 감시 기능을 강화하였다.소류의 섭취율은 높았다. 집단간의 상관도를 보면 교육별로 김치, 장아찌, 콩이 각각 p>0.5 수준에서 유의한 차가 없었고, 나머지는 유의한 차가 있었다. 연령별로는 멸치가 유의한 차가 없었고(p>0.5), 수입별로는 콩이 유의한 차가 없었다(p>0.5). 4. 영양지식(營養知識) 검토 가정생활(家庭生活)에 필요(必要)한 일반적(一般的)인 영양지식(營養知識)은 대체적으로 낮은 편이었다. 어린이 영양, 편식의 해로움, 비만증의 해로움, 임신부 그리고 수유부 영양에 대하여는 일반적으로 알고 있다고 하였으며, 그다음으로 이유기 영양, 어린이 발육에 필요한 식품, 식품과 영양소와의 관계, 우유의 성분, 노인영양에 대하여 잘 알고 있는 비율이 낮았으며, 인체의 영양소, 식단작성여부, 간식의 이론, 식품감별법에 대하여는 가장 낮은 비율을 나타냈다. 각 영양지식은 교육정도가 높을수록 영양지식이 높았고, 교육별 집단간의 유의한 차가 나타났다. (0.001

• Journal of Korea Water Resources Association
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• v.53 no.spc1
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• pp.813-826
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• 2020

This study analyzes the effects of the Smart Water City (SWC) project that was introduced from 2014 to 2016 in Paju City, Gyeonggi Province, Korea, focusing on the achievement of the business goals. The SWC is referred to as a city that embraces a healthy water supply system based on Smart Water Management (SWM) that promotes the efficiency of water management by combining Information and Communication Technologies (ICTs) with water and sewerage facilities. In order to evaluate the effectiveness of the SWC project, this study deploys evaluation criteria corresponding to the project objectives, and analyzes the outputs before and after the project. The results show that the SWC has contributed to enhancing water supply services and the reliability and drinking rate of tap water. Specific improvement areas include the rise of average water flow rate and water leakage reduction, the diffusion of water quality monitoring system, and the reduction of floating particle concentration and turbidity in drainage pipes was achieved. These were possible because of specific implementation plans for clear goal setting and achievement and active services for citizens. The data related to water quantity and quality showed improved performance compared to before the introduction of SWMS, which is a positive effect. However, a quantitative analysis of the outputs has limitations in identifying other external factors that have led to the changes. In the future, guidelines for spreading SWC and more comprehensive and specific evaluation indicators for SWC should be prepared, and SWMS should be developed in consideration of the needs of users.