• 한국학교보건학회지
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• 제30권3호
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• pp.181-193
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• 2017

Purpose: This is a qualitative descriptive study with the purpose of identifyng the health problems and related factors of socially vulnerable school-age children in Seoul, South Korea. Methods: Two focus group interviews and two individual interviews were conducted with eleven participants. They were two class teachers, three school nurses and two daycare teachers working at elementary schools and three social workers and a welfare worker working at community childcare centers. Data were analyzed using qualitative content analysis. Results: The identified psychosocial problems were 'distracting and excessive behavior', 'depression and helplessness,' 'aggression and violent behaviors', and 'internet overdependence'. The revealed physical health problems were 'poor hygiene', 'obesity', and 'gastrointestinal problems'. In addition, the fact that physical and psychosocial problems are closely inter-linked was reaffirmed through practical examples. Meanwhile, socioeconomic, family environmental, social experiential and individual factors were found to affect children's health. Relationships within a family or a peer group and healthy lifestyle were considered critical issues to deal with in order to improve the childrens' health status. Conclusion: It was proved that socially vulnerable school-age children have various physical and mental health problems due to multiple factors. Therefore, it is required to design nursing approaches that help them achieve optimal health status.

• 한국보육지원학회지
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• 제19권1호
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• pp.43-67
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• 2023

Objective: This study aimed to validate a scale which could measure the correct mediation behavior of parents for their children's smart media use. Methods: The subjects were comprised of 514 parents of 5-year-old children. The collected data were analyzed using Jasp. Results: First, in the primary validation process, a total of 19 items and five factors were extracted through exploratory factor analysis. Through secondary validation process, we found that the scale model satisfies the goodness-of-fit evaluation criteria and is valid through confirmatory factor analysis. The newly constructed parents smart media mediation scale in early childhood emerged as a valid and reliable scale. Second, it was found that the more parents pursue 'active mediation', 'instructive mediation', and 'supervision', and avoid 'co-viewing', and 'technical restrictions', the more they had a positive effect on children's smart media usage capabilities. Third, the total score of smart media mediation for young children's parents was found to significantly differentiate young children's smart media overdependence, and self-regulation. Conclusion/Implications: The final smart media mediation scale for young children's parents was composed of 19 items, with five factors: 'co-viewing', 'instructive mediation', 'technical restrictions', 'active mediation', and 'supervision'.

• 한국기계가공학회지
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• 제16권2호
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• pp.88-93
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• 2017

Due to the requirement of the development of the precision manufacturing industry, the accuracy of machine tools has become a key issue in this field. A critical factor that affects the accuracy of machine tools is the feed system, which is generally driven by a ball screw. Basically, to improve the performance of the feed drive system, which will be thermally extended lengthwise by continuous usage, a thermal error compensation system that is highly dependent on the feedback temperature or positioning data is employed in the machine tool system. Due to the overdependence on measuring technology, the cost of the compensation system and low productivity level are inevitable problems in the machine tool industry. This paper presents a novel feed drive thermal error compensation system method that could compensate for thermal error without positioning or temperature feedback. Regarding this thermal error compensation system, the heat generation of components, principal of compensation, thermal model, mathematic model, and calculation method are discussed. As a result, the test data confirm the correctness of the developed feed drive thermal error compensation system very well.

• Advances in Energy Research
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• 제4권1호
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• pp.69-86
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• 2016

The quest to reduce the level of overdependence on fossil fuel product and to provide all required information on proven existing alternatives for renewable energy has resulted into rapid growth of research globally to identify efficient alternative renewable energy sources and the process technologies that are sustainable and environmentally friendly. The present study is aimed at production and characterization of bioethanol produced from sugarcane juice using a $2^4$ factorial design investigating the effect of four parameters (reaction temperature, time, concentration of bacteria used and amount of substrate). The optimum bioethanol yield of 19.3% was achieved at a reaction temperature of $30^{\circ}C$, time of 72 hours, yeast concentration of 2 g and 300 g concentration of substrate (sugarcane juice). The result of statistical analysis of variance shows that the concentration of yeast had the highest effect of 7.325 and % contribution of 82.72% while the substrate concentration had the lowest effect and % contribution of -0.25 and 0.096% respectively. The bioethanol produced was then characterized for some fuel properties such as flash point, specific gravity, cloud point, pour point, sulphur content, acidity, density and kinematic viscosity. The results of bioethanol characterization conform to American society for testing and materials (ASTM) standard. Hence, sugarcane juice is a good and sustainable feedstock for bioethanol production in Nigeria owing relative abundance, cheap source of supply and available land for large scale production.

• Journal of Preventive Medicine and Public Health
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• 제53권5호
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• pp.307-310
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• 2020

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has placed unprecedented pressure on healthcare systems, even in advanced economies. While the number of cases of SARS-CoV-2 in Africa compared to other continents has so far been low, there are concerns about under-reporting, inadequate diagnostic tools, and insufficient treatment facilities. Moreover, proactiveness on the part of African governments has been under scrutiny. For instance, issues have emerged regarding the responsiveness of African countries in closing international borders to limit trans-continental transmission of the virus. Overdependence on imported products and outsourced services could have contributed to African governments' hesitation to shut down international air and seaports. In this era of emerging and re-emerging pathogens, we recommend that African nations should consider self-sufficiency in the health sector as an urgent priority, as this will not be the last outbreak to occur. In addition to the Regional Disease Surveillance Systems Enhancement fund (US$600 million) provided by the World Bank for strengthening health systems and disease surveillance, each country should further establish an epidemic emergency fund for epidemic preparedness and response. We also recommend that epidemic surveillance units should create a secure database of previous and ongoing pandemics in terms of aetiology, spread, and treatment, as well as financial management records. Strategic collection and analysis of data should also be a central focus of these units to facilitate studies of disease trends and to estimate the scale of requirements in preparation and response to any future pandemic or epidemic.

• 정보화정책
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• 제24권1호
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• pp.100-112
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• 2017

본 연구는 인터넷 사용, 가족 관계, 사이버폭력 피해 간의 관계를 모형 비교를 통해 검증한 것이다. 변인 간의 관계를 검증하기 위해 한국정보화진흥원의 2013년 인터넷중독 실태조사를 활용하였다. 구조방정식 분석을 통해 인터넷 사용이 가족관계를 완전 매개하여 사이버폭력 피해에 영향을 미치는 모형(모델 1)과 인터넷 사용이 가족관계를 부분 매개하여 사이버폭력에 영향을 미치는 모형(모델 2)을 비교하였다. 최종모형(모델 1)에 의하면, 인터넷 사용이 증가할수록 가족 간의 유대는 더 낮아지는 것으로 나타났고, 가족 간의 유대가 낮을수록 사이버폭력 피해는 더 커지는 것으로 나타났다. 본 연구는 인터넷 사용이 사이버폭력 피해에 직접적인 영향을 미치기 보다는 가족 관계가 두 변인간의 관계가 성립되는데 중요한 역할을 한다는 것을 밝혀낸 것에 의미가 있다. 본 연구결과를 참조하여 정책적 시사점을 제안했다.

• 디지털융복합연구
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• 제15권1호
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• pp.1-9
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• 2017

이 연구의 목적은 청소년의 성별과 학교급별 휴대전화 과다사용의 차이를 규명하는 것이다. 연구를 위해 경기도 소재의 남녀공학 중 고등학교를 각 1개씩 편의표집하고, 휴대전화 과다사용을 측정하는 자기보고식 검사지를 이용하여 자료 수집하였으며, 565명의 자료 중 휴대전화 과다사용 수준이 표본 평균보다 높은 253명을 추출하여 일원다변량분산분석을 통해 연구문제를 검증하였다. 다변량분산분석결과가 통계적으로 유의하였다. 추가적인 단변량 분석 결과에서 성별에 따른 차이는 '일상생활장애'와 '내성' 요인에, 학교급에 따른 차이는 '학교생활장애', '일상생활장애', '긍정적기대' 요인에 대한 차이가 통계적으로 유의하였다. 단계적 분석을 적용할 경우 성별 차이는 '일상생활장애'에서, 학교급별 차이는 '긍정적기대'를 제외한 4개 요인에서 통계적 유의성이 나타났다. 연구결과를 통해 휴대전화 과다사용 예방과 치료에 있어서 성별과 학교급과 같은 사용자의 기본 특성이 고려되어야 함을 논의하였다.

• 재활복지공학회논문지
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• 제10권3호
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• pp.185-197
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• 2016

본 연구는 장애인의 스마트폰 중독 실태 및 중독 특성을 알아보고 장애인의 스마트폰 중독 예방 및 해소를 위한 대응책을 제안하고자 하였다. 장애인 20~59세 총494명을 대상으로 스마트폰 중독 특성을 분석한 결과, 장애인 스마트폰중독위험군 비율은 12.55%였다. 장애인의 스마트폰, 모바일메신저, SNS 및 게임 사용시간은 2015년 인터넷 과의존 실태조사의 스마트폰 과의존 잠재위험군과 비슷하거나 더 높게 나타났다. 스마트폰중독에 관한 인식 분석 결과, 조사대상자의 2/3 정도가 스마트폰 중독이 심각하다고 생각하고 있었고, 중독관련 상담기관을 알고는 있었으나, 실제 도움을 받을 의향이 있는 사람은 그 절반 수준으로 나타났다. 이는 장애인을 대상으로 한 정책 홍보와 장애인을 위한 제도적, 구조적 기능을 갖추는 것이 필요함을 시사한다.

• Journal of Electrochemical Science and Technology
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• 제13권4호
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• pp.472-478
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• 2022

Solar energy harvesting is practiced by various nations for the purpose of energy security and environment preservation in order to reduce overdependence on oil. Converting solar energy into electrical energy through Photovoltaic (PV) module can take place either in on-grid or off-grid applications. In recent time Lithium battery is exhibiting its presence in on-grid applications but its role in off-grid application is rarely discussed in the literature. The preliminary capacity and Peukert's study indicated that the battery quality is good and can be subjected for life cycle test. The capacity of the battery was 10.82 Ah at 1 A discharge current and the slope of 1.0117 in the Peukert's study indicated the reaction is very fast and independent on rate of discharge. In this study Lithium Iron Phosphate battery (LFP) after initial characterization was subjected to life cycle test which is specific to solar off-grid application as defined in IEC standard. The battery has delivered just 6 endurance units at room temperature before its capacity reached 75% of rated value. The low life of LFP battery in off-grid application is discussed based on State of Charge (SOC) operating window. The battery was operated both in high and low SOC's in off-grid application and both are detrimental to life of lithium battery. High SOC operation resulted in cell-to-cell variation and low SOC operation resulted in lithium plating on negative electrode. It is suggested that to make it more suitable for off-grid applications the battery by default has to be overdesigned by nearly 40% of its rated capacity.

• 디지털융복합연구
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• 제15권7호
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• pp.111-121
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• 2017

스마트폰의 사용은 청소년뿐만 아니라 장, 노년층에서도 일상의 한 부분이 되고 있는 것에 비해 이들을 대상으로 한 스마트폰 과의존 관련 연구는 찾아보기 어렵다. 따라서, 본 연구는 전국의 장 노년층을 대상으로 스마트폰 과의존과 관련된 변인들을 탐색하기 위해 인구사회학적 변인, 스마트폰 사용 양, 스마트폰 사용 유형과 심리 정서적 변인이 장 노년층의 스마트폰 과의존에 미치는 영향을 확인하였다. 본 연구에서는 한국정보화진흥원의 2016년 인터넷 과의존 실태조사 자료 중 50대와 60대에 해당하는 5627명의 자료를 분석하였다. 위계적 다중회귀분석 결과, 스마트폰 주중사용횟수, 주말 사용횟수, 주중사용시간이 많을수록 그리고 정보추구와 게임을 위한 스마트폰 사용이 증가할수록 스마트폰 과의존이 높았다. 반면, 오락추구와 커뮤니케이션 유형은 스마트폰 과의존에 영향을 미치지 못했다. 또한, 외로움과 불안이 증가할수록 스마트폰 과의존이 증가한 반면, 사회적 자본이 클수록 스마트폰 과의존이 낮았다. 본 연구를 통해 장, 노년층의 스마트폰 과의존과 관련된 특성들을 이해하고, 이러한 지식을 장, 노년층의 스마트폰 과의존 문제를 해결하는데 활용할 필요가 있다. 향후 연구에서는 장, 노년층의 스마트폰 과의존에 영향을 미치는 예측변인들 간의 인과관계에 대한 가설검증도 필요해 보인다.