• International Journal of Reliability and Applications
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• 제11권2호
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• pp.69-87
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• 2010

The optimal replacement problem was investigated for a multi-state deteriorated system for which the true internal state cannot be observed directly except when the system breaks down completely. The internal state was assumed to be monitored incompletely by a monitor that gives information related to the true state of the system. The problem was formulated as a partially observable Markov decision process. The optimal procedure was found to be a monotone procedure with respect to stochastic increasing ordering of the state probability vectors under some assumptions. Limiting the optimal procedure to a monotone procedure would greatly reduce the tremendous amount of calculation time required to find the optimal procedure.

• 대한수학회보
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• 제54권3호
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• pp.993-1002
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• 2017

Let ${\Omega}$ be a bounded, uniformly totally pseudoconvex domain in ${\mathbb{C}}^2$ with the smooth boundary b${\Omega}$. Assuming that ${\Omega}$ satisfies the negative ${\bar{\partial}}$ property. Let M be a positive, finite area divisor of ${\Omega}$. In this paper, we will prove that: if ${\Omega}$ admits a maximal type F and the ${\check{C}}eck$ cohomology class of the second order vanishes in ${\Omega}$, there is a bounded holomorphic function in ${\Omega}$ such that its zero set is M. The proof is based on the method given by Shaw [27].

• 대한치과기공학회지
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• 제40권3호
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• pp.163-172
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• 2018

Purpose: The research comprehends learning attitude level of Dental Technology Department students, searches variable element to affect and is trying to provide basic material of method arrangement to induce change of positive learning attitude. Methods: It was conducted survey 410 students, who understand purpose of the research, consentient to involve research, in universities which is located in Daegu area, Daejeon City, Gangwon province from Aug., 1stto Nov.,10th2017, Questionnaires were distributed to 410 students totally. it was finally analyzed 374 questionnaires except 36 questionnaires that answer was not sufficient. Results: The positive answer over 'Average (3)' among study attitude factors was presented highly in order of 'Targeting & Execution' (3.351). 'Effective Content Summary' (3.307), 'Study Plan' (3.173), 'Priority and Self-Management' (3.116), and 'Study Habit & Enhancement' (2.925) showed negative trend under average. The five sub-factors of learning attitude were examined according to general characteristics and there were statistically significant differences according to gender, grade, high school of origin, academic aptitude(p<0.01, p<0.001). Conclusion : As male students show more positive learning attitude than female students, we need to develop more special programs to encourage them. Meanwhile we also need to find out a motive to bring positive effect to change the academic aptitude and learning attitude of female students, or methods to improve their learning attitude in a complementary way by their high school, gender and grade.

• 부모자녀건강학회지
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• 제21권1호
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• pp.11-19
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• 2018

Purpose: This study aimed to explore the experiences and needs about sex education of university entrants in Korea, and to identify the relationship among the levels of sex-related knowledge, sexual attitude and reproductive health promoting behavior. Methods: Totally 188 freshman year of two different university were recruited to reply. The design of study was a exploratory research, using a cross-sectional survey. A self-administered questionnaire was used to measure the experiences and needs about sex education. The data were analyzed with the SPSS/WIN 21.0 program. Results: 95.2% of the experienced sex education but the level of satisfaction about sex education was 38.3%. The sex education methods that subjects wanted were comfortable and interesting using videos and practices. Sex-related knowledge significantly differed according to sex. Sexual attitude differed according to the experience of sex, the line of dating and the route of information about sex. There was positive correlations among sex-related knowledge, sexual attitude and reproductive health promoting behavior of female entrants. Conclusion: So sex education program, composed of knowledge, attitude and behavior should be interesting and helpful in order to fit current trends and fulfill university entrants' needs.

• 대한치과기공학회지
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• 제36권2호
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• pp.99-110
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• 2014

Purpose: This study was carried out in order to examine the relationship of job satisfaction and social support on the dental technicians and to analyze its influence. Methods: A self-reported questionnaire survey was carried out by having convenience sampling as 220 dental technicians who work in Seoul Metropolis, Gyeonggi-do Province, Daejeon and Chungnam Province. A research tool was used questionnaire that was proved reliability and validity. It was prepared with totally 37 questions such as 12 items for subjects' general characteristics, 18 items for job satisfaction measurement, and 7 items for social support measurement. An analysis of the collected data was computationally processed by using SPSS Win 17.0 program. An analytical technique was made by using statistical techniques such as frequency & percentage, T-test or One-way ANOVA analysis. The following are the analytical results of the collected materials. Results: As a result of analyzing research subjects' job satisfaction level, there was significant difference(P<0.05) in items of religion, hobby life, working environment, and rest time out of daily work. The whole mean in job satisfaction was indicated to be relatively high with 3.13. However, job satisfaction with social recognition, salary, and safety was indicated lowly. As a result of analyzing research subjects' social support level, there was significant difference(P<0.05) in items of age, working environment, and rest time out of daily work. The whole mean in social support was indicated to be relatively high with 3.49. As a result of analyzing correlation between job satisfaction and social support, all variables were indicated to be positive correlation in high significance level, thereby having been indicated that the higher job satisfaction leads to the higher social support. Conclusion: As a result of this study, there is high correlation between social support and job satisfaction. An effort and a support are considered to be necessary for forming positive personal relations among members such as relationship with family member and with fellow employee, for improving the working conditions, and for enhancing dental technicians' pride and social recognition in order to promote dental technician's job satisfaction.

• 한국치위생학회지
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• 제10권6호
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• pp.1129-1139
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• 2010

Objectives : The purpose of this study was to examine the toothbrushing practice behavior of preschool children by observing children's actual toothbrushing behavior and further to offer basic data available for being reflected in direction and goal establishment of the systematic and organized oral health education in consideration of individual characteristic. Methods : It targeted 225 preschool children from May 6, 2010 to June 8, and analyzed by having the survey results of totally 208 people, except 17 who are noncooperative with the observation survey. As for the collected materials, it carried out frequency analysis and $x^2$-test in order to grasp subjects' general characteristics and toothbrushing practice behaviors and to examine correlation, by using SPSS 12.0 for window. Results : 1. A grasp of toothbrush was indicated 47.1% for "proper" and 52.9% for "improper." The position of holding a toothbrush was indicated to be the highest with 59.6% for "the center in grip." 2. Toothpaste amount was indicated to be 49.0% for" tip in toothbrush, "followed by 38.9% for "half in toothbrush" and 12% for "every side of toothbrush" in order. Significant difference was shown according to age($x^2$=19.125. p<.05). 3. Average toothbrushing time per once was surveyed to be $106{\pm}56$ seconds. 4. As for a toothbrushing method by region, the labial and the baccal surface were indicated to be horizontal scrub with 63% and fones method 11.5%. Significant difference was shown according to gender($x^2$=10.275. p<.05). The anterior lingual surface wasn't washed with 72.6%. Significant difference was shown according to appearance of education($x^2$=6.056. p<.05). 5. A case of requiring exchange because of being widened toothbrush was indicated to be 59.2%. The toothbrush replacement in the highest ratio was needed in kindergarten teachers. Conclusions : The actual toothbrushing practice attitude of preschool children was surveyed to be not right as a whole such as toothbrushing time, toothbrushing method, toothpaste amount, and replacement of toothbrush. Accordingly, the oral health education will need to be performed in order for a change into positive attitude and for improvement in practice level. In addition, it is considered to be likely necessary for development in substantial oral health educational program available for enhancing knowledge level of oral health care in mothers and kindergarten teachers.

• Asian-Australasian Journal of Animal Sciences
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• 제27권3호
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• pp.431-438
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• 2014

The study was carried out in order to verify the effects of piglets' weight at birth on their surface temperature change (ST) after birth, and its relationship with ingestion time of colostrum. Piglets from four different sows were weighed at birth and divided into a totally randomized design with three treatments according to birth weight (PBW): T1 - less than 1.00 kg, T2 - 1.00 to 1.39 kg, and T3 - higher than or equal to 1.40 kg. The time spent for the first colostrum ingestion was recorded (TFS). Images of piglets' surface by thermal imaging camera were recorded at birth (STB) and 15, 30, 45, 60, and 120 min after birth. The air temperature and relative humidity were recorded every 30 min and the indexes of temperature and humidity (THI) were calculated. A ST drop after 15 min from birth was observed, increasing again after sixty minutes. Positive correlations were found between the PBW and the ST at 30 and 45 min after birth. The PBW was negatively correlated with the TFS. The THI showed high negative correlations (-0.824 and -0.815) with STB and after 15 min from birth. The piglet's surface temperature at birth was positively correlated with temperature thereof to 15 min, influencing therefore the temperatures in the interval of 45 to 120 min. The birth weight contributes significantly to postnatal hypothermia and consequently to the time it takes for piglets ingest colostrum, requiring special attention to those of low birth weight.

• 한국보육지원학회지
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• 제6권3호
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• pp.103-125
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• 2010

본 연구는 보육시설에서 이루어지는 영아 감각활동을 가정과 연계하여 실시함으로써 영아의 신체발달과 영아-부모 상호작용에 미치는 효과를 알아보고 이를 통해 영아의 발달과 부모의 자녀양육에 도움을 주고자 하였다. 본 연구의 연구대상은 K시의 S어린이집과 D어린이집에 재원중인 만 1 2세 영아 56명과 영아의 어머니 또는 아버지 56명이다. 연구도구는 교사용 1 2세 영아발달평가도구(이영자, 이종숙, 신은수, 곽향림, 이정욱, 2002)중 일부와 Assessment Profile for Early Childhood Program(APECP)(Abbott-Shim & Sibely, 1987)를 수정하여 사용한 선행연구(강숙현, 2002)를 참고하여 영아-부모 상호작용 설문지를 작성하여 사용하였다. 보육시설-가정연계 감각활동은 표준보육과정에 근거하여 육아정책개발센터(2007)에서 개발한 프로그램과 삼성복지재단(2003)의 영아프로그램을 바탕으로 선정된 감각활동을 보육시설의 월간 계획안에 반영하여 1주일에 3회씩 총 8주에 걸쳐 24회 실시하였다. 연구결과, 첫째, 보육시설-가정연계 감각활동을 적용한 집단은 통제집단보다 영아의 신체발달에서 부분적으로 효과가 있는 것으로 나타났다. 둘째, 보육시설-가정연계 감각활동을 적용한 집단은 통제집단에 비해 전체적으로 영아-부모 상호작용 증진에 효과가 있는 것으로 나타났다.

• 분석과학
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• 제11권5호
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• pp.332-340
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• 1998

Salicylaldehyde와 2-hydroxy-1-naphthaldehyde를 2-aminophenol과 2-amino-p-cresol에 반응시켜 세자리 Schiff base 리간드($SIPH_2$, $SIPCH_2$, $HNIPH_2$, $HNIPCH_2$)들을 합성하였다. 이들 리간드를 Ni(II) 이온과 반응시켜 세자리 Schiff base Ni(II) 착물들을 합성 하였다. 이들 리간드와 그 착물들의 가상적인 구조와 특성을 원소분석, $^1H$-NMR, IR, UV-vis 분광법과 열 무게 분석법으로 알아보았다. Schiff base 리간드와 Ni(II) 착물의 몰비는 1:1로 결합하며, Ni(II)착물들은 3분자의 수화물이 배위된 6배위의 8면체 구조임을 알았다. 지지 전해질로서 0.1 M TBAP를 포함한 DMSO 용액에서 순환 전압전류법과 미분 펄스 전압전류법으로 세자리 Schiff base 리간드와 이들의 Ni(II) 착물들의 전기 화학적인 산화 환원 과정을 알아보았다. 세자리 Schiff base 리간드들의 전기 화학적 환원은 확산 지배적이고 비가역적으로 진행되었다. Ni(II) 착물의 전기화학적 환원과정은 1단계 1전자 반응으로 확산 지배적이고 준가역적으로 진행되었다. Ni(II) 착물들의 환원전위는 [$Ni(II)(HNIP)(H_2O)_3$]>[$Ni(II)(SIP)(H_2O)_3$]>[$Ni(II)(SIPC)(H_2O)_3$]>[$Ni(II)(HNIPC)(H_2O)_3$]순으로 양전위 방향으로 이동하였으며, 리간드의 영향은 크게 받지 않았다. 이들 결과로 부터 본 연구에서 합성한 Ni(II)착물은 [$Ni(II)(HNIPC)(H_2O)_3$] 착물이 DMSO용매에서 가장 안정함을 알 수 있다.

• 대한화학회지
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• 제42권4호
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• pp.422-431
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• 1998

Salicyladehyde와 2-hydroxy-1-naphthaldehyde를 2-aminophenol과 2-amino-p-cresol에 반응시켜 세자리 Schiff base 리간드$(SIPH_2,\;SIPCH_2,\;HNIPH_2,\; HNIPCH_2)$들을 합성하였으며 이들 리간드를 Co(II) 이온과 반응시켜 세자리 Schiff base Co(II) 착물들을 합성하였다. 리간드와 착물들의 구조와 특성을 원소분석, $^1H$-NMR, IR, UV-vis 분광법과 열 무게 분석법으로 예측하였다. Co(II) 착물들은 Schiff base 리간드와 금속(II)의 몰비가 1:1로 결합하였으며, 3분자의 수화물이 배위된 6배위 착물 구조임을 알았다.지지 전해질로서 0.1M TBAP를 포함한 DMSO 용액에서 순환 전압전류법으로 세자리 Schiff base 리간드와 이들의 Co(II) 착물들의 전기 화학적인 산화·환원 과정을 알아보았다. 리간드들의 전기 화학적 환원은 확산 지배적이고 비가역적으로 진행되었으며 Co(II) 착물의 전기 화학적 환원과정은 2단계의 1전자 반응으로 확산 지배적이고 비가역적으로 진행되었다. Co(II) 착물들의 환원전위는 [Co(II)$(HNIPC)(H_2O)_3$]>[Co(II)$(HNIP)(H_2O)_3$]>[Co(II)$(SIPC)(H_2O)_3$]>[Co(II)$(SIP)(H_2O)_3] 순으로 약간 양전위 방향으로 이동하였으나 리간드의 영향은 크게 받지 않았다.