물 전해에서 초음파에 의한 과전압 저감에 관한 연구

宋旼根,孫承佑,朱恩選 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-

The production of hydrogen fuel depends basically on the water electrolysis. The study on the overpotential which activates the hydrogen production is the core to elevate the hydrogen production efficiency on the principle. Characteristics according to the macroscopic effects of the ultrasonic are extracted to elevate the hydrogen production efficiency through measuring the hydrogen production quantity by using the electrolytic cell of the Hoffmann manner. For the above, several devices for measuring by new ideas are developed and applied. Characteristics on the overpotential decrease and the Debye phenomena are observed through the micro reaction by ultrasonic in electrolytic cell. For the above, the electrochemical analyzer, i.e., BAS is applied. Experiments with ultrasonic forcing into 4 kinds of solution such as city water, city water plus nitrogen, distilled water, and distilled water plus nitrogen are carried out. Various methods of ultrasonic forcing such as the improving method, the direct vibrating method, the indirect vibrating method, and etc., are applied as the transmissible method of ultrasonic force. The data base is constructed to design a new ultrasonic modern electrolyzer by using all the above data.

CATV홈쇼핑에서 패션제품의 구매행동에 관한 연구

송봉주,소귀숙,박은주 한국의류산업학회 2004 한국의류산업학회지 Vol.6 No.3

The purpose of this study were to investigate the differences of shopping value, promotional affects and product characteristics between buyers and non-buyers, and to examine the most influenced variable on purchasing behaviors of fashion products in CATV home-shopping. We collected data from 595 consumers related to CATV home-shopping in Busan. Data were analyzed by factor analysis, t-test, x²-test and discriminant analysis. Results showed that there are significant differences between buyers and non-buyers of shopping value demographic characteristics, promotional affects and product characteristics. Especially, shopping value perceived by consumers(e,g., practical value and hedonic value) and product characteristics(e.g., response of others) discriminated whether consumers purchased the fashion products of CATV home-shopping or not. We discussed the implications of results to encourage the purchasing behavior of fashion products in CATV home-shopping

Bovine teeth에 대한 수 종 상아질 접착제의 미세인장결합강도

송은주,김재문,김신,정태성 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.3

AAC를 이용한 PECS(사진 교환 의사소통 체계) 중재가 정신지체아동의 사물요구하기 수행에 미치는 효과

송은주 국립특수교육원 2002 특수교육연구 Vol.9 No.1

본 연구는 구어사용에 제한을 받은 중도정신지체아동에게 AAC를 이용한 PECS 중재을 사용하였을 때, 정신지체아동의 의사소통기능 중 사물요구하기 기능의 습득 및 일반화와 유지가 이루어지는지를 살펴보고, 더불어 PECS체계가 적절한 사물요구하기 뿐만 아니라 발화하기에도 영향을 미치는지 알아보고자 하였다. 본 연구는 표현언어가 1세 미만인 중도정신지체 아동 네 명을 대상으로 대상자간 중다 간헐기초선 설계로 기초선, 중재, 일반화, 유지단계로 실시하였다. 본 연구결과 첫째, AAC를 이용한 PECS중재에서 중도정신지체아동들의 적절한 사물요구하기 수행이 습득 및 유지, 일반화되었고 둘째 AAC를 이용한 PECS중재로 아동들의 발화하기의 습득이 향상되었다. 이에 본 연구의 결과가 갖는 교육적 시사점 및 제한점을 논의하고 앞으로의 연구에 대해 제언하였다. The purpose of this study is to investigate the effects of PECS intervention using AAC(Augmntative and Alternative Communication) in requesting objects of young children with mental retardation. Four young children with mental retardation who were in nonverbal language and showed few conventional forms of requesting objects participated in this study. Using Multiple probe design across subjects, The percentage of requesting objects was measured. The following questions were addressed : (1) The acquisition, generalization and maintenance of reasonable requesting objects with PECS intervention using AAC (2) The increase of verbal language in requestion function through PECS intervention using AAC (3) The generalization to new objets, adults and place of reasonable requesting objects. The results of this study were as follows : First, Through PECS intervention using AAC in requesting objects of young children with mental retardation, the level of advanced performance in requestion objects was increased. Second, The level of verbal language with PECS intervention using AAC was increased. Third, The increased level of advanced performance in requesting objects was generalized to new objects, adults, and place. The results from this investigation suggest that PECS intervention using AAC is effective in requesting objects of young children with mental retardation

에너지 소비를 고려한 Ad-Hoc 네트워크에서의 라우팅 알고리즘

송지원,박희주,차은희,이주영 덕성여자대학교 자연과학연구소 2004 자연과학 논문집 Vol.10 No.-

Ad-Hoc 네트워크는 배터리를 에너지원으로 사용하는 휴대용 기기들이 동적으로 연결되어 자치적인 네트워크 망을 형성한다. 따라서 제한된 에너지 자원을 효율적으로 관리하는 것은 시스템 수명(활동시간)을 좌우하는 중요한 문제가 된다. 본 논문에서는 위치 정보를 기반으로 한 라우팅에서 다양한 metric으로 이동 호스트의 에너지 소비와 네트워크의 시스템 수명을 비교하며, 각 이동 호스트의 잔여에너지와 소모된 에너지의 비율, 그리고 메시지 전송에 필요한 에너지들을 함께 고려한 새로운 라우팅 방법을 제시한다. 이 방법은 전체 네트워크 시스템 수명을 최대화하는 균형된 에너지 소모를 고려한 라우팅 방법이다.

신고리 지역 기상관측을 통한 계절별 대기안정도 특성분석

송상근,김유근,오인보,정주희,조윤미,우경은,강태훈 부산대학교 환경문제연구소 2003 環境硏究報 Vol.21 No.-

In this study, we analyzed the characteristics of atmospheric stability to investigate local environment change at an atomic power plant in Gori region. The used data was obtained from field observation of major meteorological variables such as wind direction and speed, air temperature, relative humidity, and solar radiation using AWS (Automatic Weather System) in Gori region from February to September in 2003. As a result, when strong northerly winds (more than 4~6 m/s) and weak northwesterly winds (2~3m/s) blow, atmospheric stability was neutral and stable from winter to spring, respectively. Atmospheric stability (neutral) in summer was similar to that in two other seasons (winter and spring), but it was stable for weak southwesterly winds (2~3 m/s). Finally, atmospheric stability was neutral for strong winds (over 4~6 m/s) in fall without respect to wind direction, while that was stable for very weak winds (less than 2 m/s).

HYPER 빔창주위의 열유동 해석에 의한 안전성 평가에 관한 연구

송민근,최진호,주은선,송태영 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-

A spent fuel problem has prevented the nuclear power from claiming to be a completely clean energy source. The nuclear transmutation technology to incinerate the long lived radioactive nuclides and produce energy during the incineration process is believed to be one or the best solutions. HYPER(Hybrid Power Extraction Reactor)is the accelerator driven transmutation system which is being developed by KAERI(Korea Atomic Energy Research Institute). Some major feature of HYPER have been developed and employed. On-power fueling concepts are employed to keep system power constant with minimum variation of accelerator power. A hollow cylinder-type metal fuel is designed for the on-line refueling concept. Lead-bismuth(Pb-Bi) is adopted as a coolant and Spallation target material. One of the issues related to the HYPER target system is the thermal and mechanical loads imposed on the Pb-Bi and the beam window. FLUENT is used for thermal-hydraulic calculation, and finally stress calculation is performed by ANSYS. A beam condition such as current is varied. The initial velocity of Pb-Bi is also varied.

八味地黃湯 煎湯液의 投與가 마우스의 自然致死 細胞의 活性度 및 免疫反應에 미치는 影響

朱松竹,李彦政,吳昇煥 圓光大學校 韓醫學硏究所 1992 원광한의학 Vol.2 No.1

This study was done to know the effects of Palmijihwangtang(八味地黃湯) on the cytotoxic activity of NK cells, the phagocytic activity of macrophages, the antibody production of B cells, and delayed-type hypersensitivity reaction by T cells in the mouse. The results were as follows. 1. The administration of Palmijihwangtang enhanced the cytotoxic activity of NK cells against YAC-1 cells. 2. The administration on Palmijihwangtang increased the production of reactive oxygen intermediate(ROI) production from macrophages without any effect on phagocytic activity. 3. The administration of Palmijihwangtang decreased the delayed-type hypersensitivity against dinitrochlorobenzene without affecting T cell subtypes. 4. The administration of Palmijihwangtang increased the antibody production against sheep red blood cells. The above results suggest that Palmijihwangtang could be used for the prevention and treatment of the diseases caused by the abnormalties of the body's immune functions.

일부 소규모 시계조립 사업장의 상지 누적외상성장애의 유병률

장은철,김현주,권영준,박시복,이수진,송재철 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.4

목적 : 단순 반복작업을 하는 시계조립 사업장 근로자를 대상으로 상지 누적외상성장애의 자각증상 유병률과 상지 누적외상성장애 유병률을 파악하고자 하였다. 방 법 : 인구학적 특성, 상지의 자각증상, 사회심리적 요인은 자가 설문지법으로, 인간공학적 특성은 점검표를 이용한 면담법으로 조사하였다. 상지의 자각증상 조사와 사회심리적 요인은 각각, N10SH (1993) 설문지와 Karasek(1979)의 Job strain model을 번역하여 조사하였다. 상지 누적외상성장애 판정은 의사가 작업 현장에서 직접 환자 면담과 이학적 검사를 수행한 후, 연구에서 규정한 증례정의에 의해 수행하였다. 수집된 자료는 x2 teat와 exact test로 단별량 분석을 하였고, 이중 의미있는 변수와 위험 인자로 알려진 변수들로 다중 로지스틱 회귀분석을 시행하였다. 결 과 : 대상자들의 자각증상 유병률은 54.2 %였고, 부위별로는 목 34.9 %, 손/손목 31.3 %, 어깨 30.1 %, 팔/팔꿈치 18.0 %순이었다. 상지 누적외상성장애의 유병률은 45.8 %였고, 근막동통증후군이 26명으로 가장 많았고, De Quervain씨 병 8명, 수부/전완부의 건염 및 건활막영 8명, 수근관 증후군 5명, 이두건염 5명, 척골 신경병증 5명, 내상과 염 4명, 외상과염 2명, 경추 디스크 질환 2명, 흥곽 출구 증후군 1명순으로 나타났다. 단변량 분석시 자각증상 유병률은 작업부서 중 완성 부에서, 상지 누적외상성장애 유병률은 여자와 완성 부에서 통계학적으로 유의하게 높았다. 다중 로지스틱 회귀분석 결과 완성부와 근무긴장도가 높은 군이 상지 누적외상 성장애와 통계학적으로 유의한 결과를 보였다. 결 론 : 이 연구에서 상지 누적외상성장애 유병률은 45.8 %으로서 저강도의 단순 반복작업을 하는 시계조립 사업장 근로자에서도 누적외상성장애의 위험이 있는 것으로 생각된다. 또한, 사회심리적 요인과 작업 부서별 공정 및 환경이 유병률에 영향을 미치는 주요 요인으로 생각되며, 향후 이들에 관한 다양한 연구가 진행되어야 할 것이다. 산업보건 현장에서는 시계조립 사업장과 같이 저 강도의 단순 반복작업을 위주로 하는 사업장에 대한 지속적인 관심과 각 사업장별 위험요인을 파악하여 적절한 예방 및 관리 대책을 세워야 할 것이다. Objectives : The prevalence of cumulative trauma disorders of upper extremities mons watch assembly workers in small-scaled industry was studied. Methods. In 83 workers at five watch assembly factories, symptoms and psychosocial questionnaire, ergonomic Interview, physical examination were conducted. Results : Prevalence of self-reported symptoms was 54.2% and neck 34.9%, wrist/hand 31.3%, shoulder 30.1%, elbow/arm 18.0% by anatomical site. Prevalence of cumulative trauma disorders was 45.8%. Most common disease was myofascial pain syndrome (31.3%). The other diseases were De Quervain disease (9.6%), tenosynovitis/tendinitis at wrist/hand (9.6%), bicipital tendinitis(6.0%), fat. epicondylitis(4.8%), meIn. epicondylitis(2.4%), and cervical disc disease(2.4%). As result of ergonomic interview, repetitiveness was 79(98.8%). There were no differences in the prevalence of self-reported symptoms and cumulative trauma disorders for age, sex, marital status, duration of work In the study, The significant factors of cumulative trauma disorders were occupational task and psychosocial stress in the study. The prevalence of cumulative trauma disorders in high strain group was hlgher (68.4%) than other three groups. The prevalence of self-reported symptoms and cumulative trauma disorders in assembly task was higher (70.0%, 64.0%) than other two tasks. Conclusions : Prevalence of self-reported symptoms was 54.2%, prevalence of cumulative trauma disorders was 45.8% in watch assembly workers. In this study, factor related to self-reported symptoms was occupational task and factors relaxed to cumulative trauma disorders were occupational task and psychosocial stress. This results suggest that differences of ergonomics and environment in occupational task cause differences of prevalence of self-reported symptoms and cumulatlve trauma disorders.

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.