청소년의 스마트폰 중독과 우울 및 불안과의 관계

김경은,김필송,민주연,박수경,신서인,이지은,정해인,조호정,최정원,최정인 이화여자대학교 간호과학대학 2013 이화간호학회지 Vol.- No.47

Purpose: The purpose of this study was to investigate the relationships between the degree of smart phone addiction among adolescents and their depression and anxiety levels. Method: In this study, 379 high school students were selected using the convenient sampling method. The instruments used for this study were smart phone addiction measure, the CES-D (Center for Epidemiological Studies-Depression Scale), and the STAI (State-Trait Anxiety Inventory). Data were analyzed using the SPSS 20.0 program with descriptive statistics, t-test, ANOVA with Scheffe test, and Pearson’s correlation coefficient. Result: The mean score for smart phone addiction was 40.45±17.27, depression was 36.56±9.58, state anxiety was 44.00±9.61, and trait anxiety was 45.70±9.75. There were significant differences between the degree of smart phone addiction and the following variables: gender (t=-4.953, p<.001), hours of smart phone use per day (F=12.259, p<.001), types of frequently used features (F=3.485, p=.008), and satisfaction level for smart phone (F=5.18, p<.001). There were statistically significant relationships (p<.001) among degree of smart phone addiction, depression level, and state and trait anxiety levels. Conclusion: The results of this study suggested that there was a significant relationship between smart phone addiction and mental health, specifically, depression and anxiety among adolescents. Further research is needed to develop nursing strategies to provide care for adolescents who frequently utilize smart phones.

디젤엔진排出에서 나노PM 粒子計測用 凝縮核개수기(CPC) 特性에 關한 比較解析

鄭珉元,崔源鶴,柳鍾植,李海喆,車京玉 明知大學校 産業技術硏究所 2008 産業技術硏究所論文集 Vol.27 No.-

Recently, the nano-PM 's number concentration emitted by diesel internal combustion engine has focused on attention because this particulate matters are suspected being hazardous of human health. In this study, the particulate matters (PM) emissions of these vehicles were investigated by number concentration. A condensation particle counter (CPC) system was applied to measure the particle number and size concentration of diesel exhaust particles at the end of dilution tunnel along the NEDC(ECE15+EUDC) vehicle test mode using TSI 3010D and HCT 4312 CPC. As the research result, the characteristic of CPC comparison diesel nano-particle number and size distribution was investigated in this study.

그람양성구균에 대한 Teicoplanin과 Vancomycin의 시험관내 항균력

최태열,김경숙,전용관,서일혜,김정욱,이웅수,안정열,김홍석,정재용,최효선,김덕언,유진우 대한감염학회 1994 감염 Vol.26 No.1

An increasing frequency of methicillin resistant S. aureus(MRSA), methicillin resistant coagulase negative staphylococci(MRCNS) and Enterococcal infection have been observed in recent years. Teicoplanin is a new glycopeptide antibiotic obstained from the Actinoplanes teicomycetius. The molecular structure and spectrum of antimicrobial activity of teicoplanin is simillar to those of vancomycin, and has been reported to have an excellent in vitro and in vivo effect against various gram-positive infections. Therefore, we evaluated the in vitor susceptibility of gram positive cocci, such as, S. aureus, coagulase negative Staphylococci(CNS), and Enterococci to teicoplanin and vancomycin. The total 253 strains consisted of MSSA(40), MRSA(53), MSCNS(47), MRCNS(48), and Enterococci(65). They were assayed by disc diffusion and agar dilution. During the study, 57% of S. aureus and 49% of CNS showed resistance to methicillin. The inhibitory diameter of teicoplanin was 15-20mm in MSSA, 12-19mm in MRSA, 13-24mm in MSCNS, 11-23mm in MRCNS, and 15-22mm in Enterococci respectively, and showed sensitivity in all but 8 strains(3.2%). The range of the minimum inhibitory concentration (MIC) of teicoplanin to MSSA, MRSA, MSCNS, MRCNS and Enterococci were 9.12-2.0㎍/ml, 0.25-2.0㎍/ml, & 0.25-32㎍/ml, 0.12-1.0㎍/ml respectively. One case of S. haemolyticus was resistant to teicoplanin (32㎍/ml) by the agar dilution method. Eight minor (3.2%) and one major(0.4%) error was observed when the MIC and disk diffusion data were correlated with teicoplanin. As for vancomycin the inhibitory diameter was 17-21mm in MSSA, 15-21mm in MRSA, 18-26mm in MSCNS, 18-25mm in MRCNS, and 16-22mm in Enterococci respectively. The range of the MIC of vancomycin to MSSA, MRSA, MSCNS, MRCNS, and Enterococci were 0.25-1.0㎍/ml, 0.25-4.0㎍/ml, 0.5-2.0㎍/ml and 0.5-2.0㎍/ml respectively. One minor error (0.4%) was seen with the vancomycin disk. The MIC90 of MSSA and MRSA exhibited the same results in teicoplanin (1.0㎍/ml, 1.0㎍/ml), and vancomycin(2.0㎍/ml, 2.0㎍/ml). MSCNS and MRCNS exhibited greater MIC90 with teicoplanin(4.0㎍/ml, 8.0㎍/ml) than vancomycin(2.0㎍/ml, 2.0㎍/ml). Incontrase Enterococci were more susceptible to teicoplanin(0.5㎍/ml) than to vancomucin (2.0㎍/ml). Results from this analysis indicated that both teicoplanin and vancomycin were very excellent for gram positive infections, especially those resistant to methicillin.

SrTiO₃첨가에 따른 (x)BaTiO₃-(1-x)SrTiO₃의 유전적, 전기적 특성

정해덕,장동환,김덕근,홍경진,최창주 木浦大學校 工業技術硏究所 1998 工業技術硏究誌 Vol.8 No.-

In this paper, a ferroelectric material BaTiO3 was added to SrTiO3, then (x)BaTiO3-(1-x)SrTiO3(0.7≤x≤1) ceramics were fabricated with stable electrical properties in high voltage. Microstructures and electrical properties were investigated according to mixing conditions of addition material SrTiO3. As a result of the investigation of all experiments, the shrinkage was excellent in 0.9BaTioO3-0.1SrTiO3. The grain size was increased, the curie temperature was shifted low temperature. The 0.9BaTiO3-0.1SrTiO3 was appeared stable property in temperature vs. permittivity. Also, 0.9BaTiO3-0.1SrTiO3 was showed stable dielectric properties at 25~85[C]. V-I properties of specimen were observed in the temperature range of 21~143[C], were divided into three regions. the region I below 10[kV/cm] was shown Ohmic conduction, the region II from 10 to 30[kV/cm] was explained by the poole-Frenkel emission theory and the region III above 30[kV/cm] was analysed by the tunneling effect.

慶南의 輸出과 地域經濟成長에 대한 因果關係 硏究

정대철,최해범 昌原大學校 社會科學硏究所 1998 사회과학연구 Vol.4 No.-

慶南의 地域經濟 强化方案에 관한 硏究

鄭大喆,崔海範 昌原大學校 産業經濟硏究所 1996 産經硏究 Vol.13 No.-

공공부문 정보시스템의 하드웨어 용량산정 방식 설정을 위한 실증적 연구

정해용,나종회,최광돈 한국정보사회진흥원 2005 정보화정책 Vol.12 No.3

2002년도부터 2006년도까지의 국가정보화촉진계획인『e-Korea Vision 2006』에 의하면 과거 수년 동안 정보시스템에 대한 투자액은 급격하게 증가하고 있으며, 정보시스템에 대한 투자액의 50%이상은 하드웨어 구축에 소요되는 비용인 것으로 분석되고 있다. 따라서 정보시스템 구축∙운영에 소요되는 하드웨어 규모를 적정하게 산정하는 작업은 효과적인 정보화 투자를 위한 필수불가결한 작업으로 인식되고 있으며, 이를 통하여 자원낭비를 최소화하고 기회비용을 절감할 수 있다는 점에서 그 중요성이 증대되고 있다. 이러한 관점에서 본 연구에서는 공공부문에서의 정보시스템 구축∙운영에 필요한 하드웨어 용량을 객관적으로 산정할 수 있도록 용량산정식 및 용량산정식에 포함될 항목들을 실증적으로 제시하였다. 즉, 업무중심의 정보시스템 프로젝트 단위별로 CPU 및 메모리와 하드디스크의 용량을 산출하는데 고려해야 할 항목들과 이러한 항목들을 통하여 적정 용량을 산정할 수 있는 용량 산정식을 도출하였다. 이론적 문헌검토와 SI업체 및 하드웨어 공급업체의 사이징 전문가들의 경험적 노하우 등을 통하여 기존에 활용되고 있는 용량산정식에 근거하여 기준이론을 설정하고 이를 현장의 실무전문가들을 대상으로 설문조사 및 전문가 집단토의 방식을 통하여 타당도를 검증하였다. 본 연구의 주요 의의로는 공공기관의 현장실무 전문가 및 공급업체의 용량산정 전문가들을 대상으로 실행적 측면에서 CPU(Web/WAS용 및 OLTP용), 메모리, 디스크에 대한 용량산정식 및 각 용량산정식에 포함되어야 할 항목들이 실증적으로 도출되고 전문가 집단토의를 통하여 확인함으로써 객관성을 확보한 용량산정식을 제시하였다는 점이다.

의류 중의 미생물에 대한 소비자의 지식과 세탁습관 실태조사 분석

최해운,정찬진,박명자 服飾文化學會 2002 服飾文化硏究 Vol.10 No.6

Microorganisms living in clothing cause damage to fabric as well as unhygienic conditions with unpleasant odor for wearers. Removal or growth of microorganisms are affected by the conditions during washing and storage. The purpose of this research was to study the consumer's knowledge and habits in laundering with respect to microorganisms in clothing. For survey method, questionnaires were administered to 580 housewives, age of 20~60s living in Seoul. Employing 479 respondents, the data were analyzed by using deseriptive statistics. The results are as follows; The level of knowledge about microorganisms of clothing was high in general, but wasn't expert level. Many people had experienced damages of textiles, clothing and unpleasant odor due to microorganisms. Fabric softeners and bleaches were rarely used for disinfection but usually used for antistatic. whitening or removal of stains. There was no relationship between laundering habits the knowledge of microorganism, and experience of clothing damage by microorganism

디젤 乘用車輛에서 DPF 條件에 따른 極微細粒子의 排出 特性에 關한 硏究

鄭珉元,崔源鶴,柳鍾植,李海喆,車京玉 明知大學校 産業技術硏究所 2008 産業技術硏究所論文集 Vol.27 No.-

Recent1y, the nano-PM(Particulate Matters) number concentration emitted by diesel internal combustion engine has focused on attention because this nano-PM is suspected being hazardous of human health. In this study, the PM of the diesel passenger vehicles were investigated by number concentration. A condensation particle counter (CPC) system was used to measure the particle number concentration and size of diesel exhaust particles at the end of dilution tunnel during the NEDC(ECE15+EUDC) vehicle test mode using light-duty diesel passenger vehicles with DPFs. As a research result, the characteristic of DPF performance about diesel nano-particle number concentration and size distribution was investigated in this study.

한국인에서 구강상피세포를 이용한 발암물질 대사효소의 유전자 다형성에 관한 연구

최민아,박해준,정원윤,이재원,이정복,박광균 대한암예방학회 2002 Journal of cancer prevention Vol.7 No.3