• 한국수산과학회지
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• 제35권6호
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• pp.639-643
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• 2002

막분리여과 시스템을 이용한 수질환경의 조절과 인공종묘생산 어류의 성장에 미치는 영향을 조사하기 위하여 사육수의 수질분석, 세균상 조사 및 자어의 성장률 등을 조사하여 비교하였다. 실험구는 고압모래여과기구 (SFS)와 막분리여과시스템구 (WS)을 두었으며, 수질에 대해서는 pH, 염분도, $DO,\;SS,\;COD,\;NH_{4}^{+},\;NO_{2}^{-},\;NO^{-},\;DIN,\;DIP$를 분석하였다. 대부분의 분석항목에서는 SFS구와 UFS구에서 큰 차이가 없었으나, 염분도는 SFS구 $33.5\%_{cdot}$, UFS구 $30.2\%_{cdot}$이었으며, 55는 SFS구 15.5mL/L, 7.0mL/L으로써 염분도와 SS에 대해서는 낮은 값을 나타내었다. 세균상 및 총균수의 변동에서 자연해수의 $6{\times}10^{5}CFU/mL$은 SFS구에서 약 1/6의 비율로 낮아지고 9일째 이후 총균수와 Vibrio속이 급격히 증가하고 Acinetobacter속 및 Micrococcus속 세균이 급증하기 시작하였으나, UFS구에서는 Ajteromonas속 세균의 일부가 남아있는 것 이외에 실험기간 중 안정적인 세균상을 유지하였다 성장률은 SFS구가 전장 17.0mm (SGR 14.0)이었으며, UFS구가 18.8mm (SGR 14.3)로서 유의적으로 높은 성장을 나타내었다. 막분리여과시스뎀을 이용하여 무균해수를 종묘생산장에 공급하는 것은 수질환경의 안정과 제균효과에 의해 세균의 증식이 억제되므로 자치어의 사육환경이 안정적으로 유지되어 질 수 있는 것으로 판단된다.

• 응용통계연구
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• 제16권2호
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• pp.427-440
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• 2003

휴대전화, PDA와 같은 이동 단말기와 무선 통신의 발전으로 인하여, 이동 단말기를 이용한 전자 메일, 게임, 주식거래 등이 가능하게 되었다. 무선 단말기를 통한 주식거래나 게임 등을 위하여서는 난수발생기(Random Number Generator)의 사용이 필수적이다. 그런데 최근까지의 난수발생기는 우수한 난수성에 중점을 두어 개발되었으며, 이동 단말기에서의 에너지 소비량에 대한 연구는 없었다. 이동 단말기는 무게 및 크기의 한계 때문에 배터리의 용량에 제한이 있게되므로, 되도록 에너지 소비량을 줄여서 주어진 배터리를 오랫 동안 사용하기를 원하게 된다. 본 논문에서는 이동 단말기에서 많이 사용되는 여러 난수발생기들을 살펴보고, 저전력 에너지 측정도구인 SES(SNU Energy Scanner)를 이용하여 각 난수발생기의 에너지 소비량을 측정하여 이들을 비교한다. 이를 바탕으로 이동 단말기 환경에서 저전력을 소모하는 난수발생기를 제안하였다.

• Journal of Microbiology and Biotechnology
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• 제19권2호
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• pp.147-154
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• 2009

The carboxylesterase-encoding gene(bioHs) of a newly isolated strain, Serratia sp. SES-01, was cloned from the genomic DNA library by detecting formation of transparent halo around the colony on LB-tributyrin agar plates. The amino acid sequence of BioHs was highly similar to the members of the BioH enzyme family involved in the biotin biosynthetic pathway; it showed the highest similarity(91%) with that of Serratia proteamaculans. To compare BioHs with other BioH enzymes, the relatively well-known bioHe gene of E. coli was cloned with PCR. After we achieved high-level expression of soluble BioHs and BioHe through the exploration of different culture conditions, the purified BioHs and BioHe enzymes were characterized in terms of specificity, activity, and stability. BioHe was generally more robust to a change in temperature and pH and an addition of organic solvents than BioHs. The two enzymes exhibited a strong preference for carboxylesterase rather than for thioesterase and were optimal at relatively low temperatures($20-40^{\circ}C$) and alkaline pHs(7.5-9.0). The results in this study strongly suggested that both the BioHs and BioHe enzymes would be potential candidates for use as a carboxylesterase in many industrial applications.

• 생물치료정신의학
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• 제24권3호
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• pp.163-172
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• 2018

Objectives : The aim of this study was to examine associations between quality of life in patients with schizophrenia and their family relationships. Methods : A total of 68 patients with schizophrenia participated in the study. Socio-demographic and clinical data were collected, as well as results from the Subjective Well-being under Neuroleptic Treatment Scale-Short Form(SWN-K), Family Emotional Involvement and Criticism Scale(FEICS), a visual analogue scale for evaluating the degree of perceived criticism(VAS), the Family Adaptability and Cohesion Evaluation Scale(FACES), Beck Cognitive Insight Scale(BCIS), and Rosenberg Self Esteem Scale(R-SES). Psychiatrists administered the Positive and Negative Syndrome Scale and the Calgary Depression Scale for Schizophrenia(CDSS), and collected a history of previous suicide attempts. Results : The SWN-K total scores showed significant negative correlations with scores on the FEICS perceived criticism, CDSS, and VAS measures and significant positive correlations with scores on the R-SES, FACES, and BCIS. Multiple regression analysis revealed that FEICS perceived criticism, FACES, and BCIS scores were significantly associated with SWN-K scores. The FACES total score was significantly lower in patients with a history of previous suicide attempt. Conclusion : The quality of life of patients with schizophrenia was negatively associated with greater perceived familial criticism and positively associated with better family cohesion and higher patient insight. In patients with a history of suicide attempts, family adaptability and cohesion were significantly low.

• Child Health Nursing Research
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• 제22권4호
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• pp.370-378
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• 2016

Purpose: The purpose of this study was to examine current status of somatic symptoms of late school-aged children using the school health clinic and to investigate the influence of perceived attachment security and social support on their somatic symptoms. Methods: For this descriptive study, self-report questionnaires were completed by fifth and sixth graders attending 'A' elementary school in Gyeonggi-do. Data from 216 students were included. Data analysis included descriptive statistics, t-test, ANOVA, Pearson correlation coefficient, and multiple regression analysis. Results: Most frequent somatic symptoms were headache, fainting, backache, numbness in a body part, and muscle ache in that order. More frequent somatic symptoms were reported by girls, students who recognized their family SES as low, students who used school health clinic often and students who were dissatisfied with school life. Somatic symptom showed negative correlations with attachment stability and perceived social support from family and teachers. In the regression analysis, the variables; low attachment stability, female gender, and low satisfaction with school affected more frequent somatic symptoms. Conclusion: Careful monitoring of late school-aged children expressing frequent somatic symptoms is required. Intervention programs to improve attachment security and satisfaction with school should be developed for school children, especially girls, presenting with somatic symptoms.

• 대한가정학회지
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• 제46권10호
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• pp.97-106
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• 2008

We examined the effects of family and home literacy environments on the vocabulary and reading abilities of 3 to 5-year-olds. In particular, SES was considered against home literacy environment. The sample consisted of 366 Korean children and their mothers. We found that the level of mother's education was related to the child's vocabulary test score. After controlling for family factors, home literacy environment score positively predicted children's performance both in vocabulary and reading tests. Magnitudes of differences between the two literacy groups (high and low home literacy environment) became larger in the children from relative lower income families. Magnitudes of differences for vocabulary and reading tests was strikingly large in the low-income group both in vocabulary and reading tests. These findings shed lights on the importance of parent education and family services for low-income families with preschool children.

• Nutrition Research and Practice
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• 제4권6호
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• pp.528-534
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• 2010

This study explores the influence of health behaviors and individual attributes on adolescent overweight and obesity using data from Wave II (Add Health). Structural equation model/ path analysis using maximum likelihood estimation was utilized to analyze the relationships of health behaviors and attributes with obesity. Results of the model reveal that the causal paths (adolescents' attributes and health behaviors) for overweight and obesity were different for African American and Caucasian adolescents. Generally, African Americans were more susceptible to overweight and obesity than Caucasians. Although increasing levels of vigorous physical activities lowers the risk for obesity among African American and Caucasian adolescents alike, low family SES and being sedentary were associated with overweight and obesity among Caucasians. No significant associations were found among African Americans. Increased hours of sleep at night relate positively with obesity among African Americans. These findings suggest important elements in the consideration of race in developing effective intervention and prevention approaches for curbing the obesity epidemic among U.S. adolescents.

• 아동학회지
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• 제25권5호
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• pp.163-178
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• 2004

The hypothesis was tested that children whose families differ in socioeconomic status(SES) and educational level differ in their rates of productive language development because they have different language-learning experiences. Naturalistic interaction between mothers and their children was video taped. Transcripts of these interactions provided the basis for estimating the growth in children's productive vocabularies and properties of maternal speech. The sixty children from age 1 to 3 were selected in Yanji, China. The results show that the high educated mothers' children grew more than the low educated mothers' children in their mean length of utterances. Properties of maternal speech that differed as a function of mother's educational level fully accounted for this difference. Implications of these findings for mechanisms of environmental influence on child development are discussed.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1995년도 춘계학술대회
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• pp.155-159
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• 1995

A design method that can easily construct intelligent patient monitoring systems is proposed. To achieve the design method, the SES/MB concept and a discrete event-based logic control formalism based on a set theory is introduced. In this control paradigm the controller expects to receive confirming sensor responses to its control commands within definite time windows determined by DEVS model of the system under control. Because data to be used for rule-based symbolic reasoning are to be abstracted, several AI methods are applied the processes. These methods are applied to intelligent patient monitoring systems so that they facilitate transformation from low level raw data to high level linguistic data. Model-based system representations have advantages of reusability, extensibility, flexsibility, independent testability and encapsulation.

• 한국진공학회지
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• 제15권1호
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• pp.1-13
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• 2006

한국표준과학연구원 진공연구실은 1983년 설립된 이후 초음파간섭 수은주압력계, 정적형 표준기 및 동적교정장치 등을 개발하여 저진공에서 초고진공까지 국가 진공표준의 확립 및 보급을 하고 있다. 본 연구에서는 각각의 진공표준기, 국제표준화기구의 권고에 의한 불확도 분석방법, 그리고 핵심측정표준 국제비교 및 국가간 상호비교 결과를 소개한다.