• 한국전기전자재료학회논문지
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• 제31권5호
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• pp.307-312
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• 2018

Liquid phases in ZnO varistors cause more complex phase development and microstructure, which makes the control of electrical properties and reliability more difficult. Therefore, we have investigated 2 mol% $CaCO_3$ doped $ZnO-Co_3O_4-Cr_2O_3-La_2O_3$ (ZCCLCa) bulk ceramics as one of the compositions without liquid phase sintering additive. The results were as follows: when $CaCO_3$ is added to ZCCLCa ($644{\Omega}cm$) acting as a simple ohmic resistor, CaO does not form a secondary phase with ZnO but is mostly distributed in the grain boundary and has excellent varistor characteristics (high nonlinear coefficient ${\alpha}=78$, low leakage current of $0.06{\mu}A/cm^2$, and high insulation resistance of $1{\times}10^{11}{\Omega}cm$). The main defects $Zn_i^{{\cdot}{\cdot}}$ (AS: 0.16 eV, IS & MS: 0.20 eV) and $V_o^{\bullet}$ (AS: 0.29 eV, IS & MS: 0.37 eV) were found, and the grain boundaries had 1.1 eV with electrically single grain boundary. The resistance of each defect and grain boundary decreases exponentially with increasing the measurement temperature. However, the capacitance (0.2 nF) of the grain boundary was ~1/10 lower than that of the two defects (~3.8 nF, ~2.2 nF) and showed a tendency to decrease as the measurement temperature increased. Therefore, ZCCLCa varistors have high sintering temperature of $1,200^{\circ}C$ due to lack of liquid phase additives, but excellent varistor characteristics are exhibited, which means ZCCLCa is a good candidate for realizing chip type or disc type commercial varistor products with excellent performance.

• Radiation Oncology Journal
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• 제33권3호
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• pp.179-187
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• 2015

Purpose: The purpose of this study was to investigate the predictable value of pretreatment $^{18}F$-fluorodeoxyglucose positron emission tomography-computed tomography ($^{18}F$-FDG PET-CT) in radiotherapy (RT) for patients with hepatocellular carcinoma (HCC) or portal vein tumor thrombosis (PVTT). Materials and Methods: We conducted a retrospective analysis of 36 stage I-IV HCC patients treated with RT. $^{18}F$-FDG PET-CT was performed before RT. Treatment target was determined HCC or PVTT lesions by treatment aim. They were irradiated at a median prescription dose of 50 Gy. The response was evaluated within 3 months after completion of RT using the Response Evaluation Criteria in Solid Tumors (RECIST). Response rate, overall survival (OS), and the pattern of failure (POF) were analyzed. Results: The response rate was 61.1%. The statistically significant prognostic factor affecting response in RT field was maximal standardized uptake value (maxSUV) only. The high SUV group (maxSUV ${\geq}5.1$) showed the better radiologic response than the low SUV group (maxSUV < 5.1). The median OS were 996.0 days in definitive group and 144.0 days in palliative group. Factors affecting OS were the %reduction of alpha-fetoprotein (AFP) level in the definitive group and Child-Pugh class in the palliative group. To predict the POF, maxSUV based on the cutoff value of 5.1 was the only significant factor in distant metastasis group. Conclusion: The results of this study suggest that the maxSUV of $^{18}F$-FDG PET-CT may be a prognostic factor for treatment outcome and the POF after RT. A %reduction of AFP level and Child-Pugh class could be used to predict OS in HCC.

• 한국산학기술학회논문지
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• 제17권6호
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• pp.226-232
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• 2016

본 연구는 비만 노인여성을 대상으로 아쿠아로빅 운동을 적용한 후 신체조성 및 혈중지질의 개선효과를 알아보고 노인운동프로그램에 관한 다각적인 기초자료를 제공하는데 목적이 있다. 실험참가자들 (n=31)은 12주 동안 주 3회 60분의 아쿠아로빅 운동을 Borg의 운동자각도 12-13의 강도로 실시하였다. 신체조성은 inbody의 생체전기저항분석법을 사용하여 측정하였고 채혈된 혈액에서 혈중지질 (고밀도지단백(HDL), 저밀도지단백(LDL), 중성지방(TG)와 총콜레스터롤(TC))을 분석하였다. 자료의 분석은 대응 t-test를 이용하였고 유의수준은 0.05로 설정하였다. 아쿠아로빅 운동 후 체지방량과 허리둘레는 유의하게 감소하였고 (p < 0.05) 혈중지질 중 LDL (p < 0.05), TG (p < 0.001), 그리고 TC (p < 0.05)은 유의하게 감소하였다. 이상과 같은 결과를 볼 때 아쿠아로빅 운동은 신체조성과 혈중지질에 긍정적인 방향으로 변화시켰으며, 지방대사의 활용을 높여 지질분해의 향상과 신체조성을 증진시키고 고지혈증의 위험성을 낮출 것으로 생각된다. 따라서 아쿠아로빅 운동이 지상에서의 유산소 운동 및 저항 운동을 대체할 수 있는 유용한 운동이라 할 수 있다.

• 한국운동역학회지
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• 제17권2호
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• pp.177-185
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• 2007

Even though there were no clear definitions of the short game and short game distance, short game capability is crucial for a good golf score. Generally, chip shot and pitch shot are regarded as two principal components of the short game. Chip shot is a short, low trajectory shot played to the green or from trouble back into play. Pitch shot is a high trajectory shot of short length. Biomechanical studies were conducted usually to analyze full swing and putting motions. The purpose of the study was to reveal the kinematical differences between professional golfers' 30 yard $53^{\circ}wedge$ chip shot and $56^{\circ}wedge$ pitch shot motions. Fifteen male professional golfers were recruited for the study. Kinematical data were collected by the 60 Hz three-dimensional motion analysis system. Statistical comparisons were made by paired t-test, ANOVA, and Duncan of the SPSS 12.0K with the $\alpha$ value of .05. Results show that both the left hand and the ball were placed left of the center of the left and right foot at address. The left hand position of the chip shot was significantly left side of that of the pitch shot. But the ball position of the pitch shot was significantly right side of that of the chip shot. All body segments aligned to the left of the target line, open, at address. Except shoulder, there were no significant pelvis, knee, and feet alignment differences between chip shot and pitch shot. These differences at address seem for the ball height control. Pitch shot swing motions(the shoulder and pelvis rotation and the club head travel distance) were significantly bigger than those of the chip shot. Club head velocity of the pitch shot was significantly faster than that of the chip shot at the moment of impact. This was for the same shot length control with different lofted clubs. Swing motion differences seem mainly caused by the same shot length control with different ball height control.

• Journal of Periodontal and Implant Science
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• 제29권1호
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• pp.173-192
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• 1999

The purpose of this study was to evaluate the effects of bioactive glass and natural coral on the human periodontal ligament fibroblast(HPLF) behaviors during the regeneration process of peridontium. To determine the cellular events occuring in the presence of the particles of bioactive glass and natural coral, HPLF were isolated from healthy premolar teeth extracted for orthodontic treatment. Cells were cultured in ${\alpha}$MEM at 37$^{\circ}C$, 5% $CO_2$, 95% humidity incubator. Bioactive glass and natural coral were powdered, and each particles(<40${\mu}$m) were placed on the cultured cells at the concentration of 0.3mg/ml, and 1,0mg/ml for experimental group. In control group no particles were added. And each group was evaluated by examining the cell morphology under phase-contrast micrograph at 4 day and transmission electron micrograph(TEM) and scanning electron micrograph(SEM) at 14 day, alkaline phosphatase activity at 5 and 9 day, protain synthesis at 4 day, DNA synthesis at 1, 2, 3 and 4 day, cell proliferation at 1, 3, 5,7 and 9 day and the formation of bone nodule at 30 day after culturing all groups in mineralizing supplemented mediun, No significant changes in cell morphology by adding these two matirials were found under phase contrast microscopy and TEM. HPLF phagocytocized each particles suggesting that HPLF is involved in the process of resorbing each particles and that bioactive glass were more biocompatible than natural coral. The ALPase activity of bioactive glass 0.3 mg/ml was similar with control groups and all the rests of control groups were significantly low(P<0.01) indicating a transient dedifferentiation of HPLF in the presence of bioactive glass and natural coral particles. There were no significant differences of protein synthesis between all groups. The DNA synthesis in experimental groups were significantly lower than control groups at 1, 2 and 3 day (P<0.01) but became similar to control groups at 4 day. Between control groups, the DNA synthesis in bioactive glass O.3mglml group was significantly higher than other groups(P<0.01). Cell proliferation in natural coral 1.0mg/ml and bioactive glass 1.0mglml groups were significantly lower than control group at 3 day(P<0.05) and there were no differences at 5, 7, 9 day. There were more bone nodule formation in experimental groups than in control groups. In conclusion, these results indicated that bioactive glass and natural coral have some effects of a transient dedifferentiation on HPLF and regeneration of periodontal tissues, however any significant cytotoxic effect on HPLF by these two particles were not found.

• 동아시아식생활학회지
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• 제7권4호
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• pp.429-444
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• 1997

This study aimed at investigating correlation of nutrients intake and serum lipids in middle-aged korean male and female workers. One hundred sixty eight(male ;105, female ;63) for adult aged 30-59yr(average age male ;36.5yr, female ;44.5yr) were selected as subjects during 2 months, from April to May, 1996. Nutrients intake status was investigated by questionnaire, 24-hour recall method. Antropometric assessments, serum lipids and blood pressure of the subjects were investigated. The results as follows: 1. Nutrients intake status ; male was superior to female. Vitamin A intakes of 40-49yr group were inferior to other group but amounts of intake were above Korean RDA(recommended dietary allowances), Intakes of calcium and vitamin C of 30-39yr and over 50yr group in female were below Korean RDA. In overweights group of male and underweight group of female, most nutrients intake were increased than other groups. 2. Antropometric assessments ; female was higher than male in BMI (body mass index). All subjects increasingly with age were increased in BMI. 3. Blood components were above normal range in triglyceride in both sexes and all subjects increasingly with age were increased In level of serum lipids and blood pressure, especially in male's forty and in female's fifty were higher than other groups In serum lipids and blood pressure. In overweights group, serum lipids and blood pressure had a significantly($\alpha$=0.05) increasing tendency in both sexes. 4. Serum lipids and connected factors; atherogenic index correlated positively with triglyceride, total-chol(total cholesterol), LDL-chol(low density-lipoprotein cholesterol) and negatively with HDL-chol(high-density-lipoprotein cholesterol) significantly(P＜0.001). Systolic blood pressure correlated positively with total-chol and diastolic blood pressure correlated positively with total-chol, LDL-chol significantly(P＜0.05). 5. Serum lipids and nutrients intake status: energy correlated positively(P＜0.05) with BMI, dietary fiber correlated positively with LDL-chol(P＜0.05), calcium correlated positively with triglyceride, atherogenic index and dietary fiber correlated negatively with BMI in male significantly(P＜0.05). Triglyceride correlated positively with vitamin C and phosphorus correlated negatively with BMI in female significantly(P＜0.05). Above results, in male's forty and in female's fifty were liable to variation in terms of serum lipids and blood pressure. As increasing triglyceride, total-chol, LDL-chol and decreasing HDL-chol Increased atherogenic index that suggest increasing risk of atherosclerosis. But, this point will be considered more subdivided study.

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2003년도 춘계학술대회 논문집
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• pp.423-423
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• 2003

The radiative properties of atmospheric aerosol are determined by the mass and chemical characteristics, and optical properties such as aerosol optical depth (AOD), ngstr m parameter ( $\alpha$) and single scattering albedo (SSA). In particular these aerosol optical properties also determine surface temperature perturbation that may give some information in understanding the regional atmospheric radiative forcing. For understanding the radiative forcing and regional surce of aerosol, this paper summarizes and compares the aerosol optical properties results from and compares the atmospheric aerosol optical properties results from two different experiments: Anmyeon 2000 and Jeju 2001. Korea Global Atmosphere Watch Observatory (KGAWO) at Anmyeon island and ACE-Asia super-site at Gosan Jeju island have measured the radiations and aerosols since the year of 2000. The sites are located in the mid-west and south of Korea peninsula where it is strongly affected by the Asian dust coming from China region in every spring. Aerosol optical properties over both sites were measured through the ground-based sun and sky radiometers were analyzed for understanding the radiation and climate properties. Number concentration and chemical components of aerosol were additionally analyzed for the source estimation in the transportation. The frequency distributions of aerosol optical depth are rather narrow with a modal vaiue of 0.38 at both sites. However, the distributions of show one peak (1.13) at Jeju but two peaks (0.63 and 1.13) at Anmyeon. In the cases of Anmyeon, one peak around 0.63 corresponds to relatively dust-free cases, and the second peak around 1.13 characterizes the situation when Asian dust is presented. The correlation between AOD and resulted high correlation on the wide range with high values of optical depth at Anmyeon, otherwise a narrow range of with moderate to low AOD at Jeju. In dust free condition SSA decrease with waveleneth while in the presence of Asian dust SSA either stays neutral or increases slightly with wavelength. The change of surface temperature shows the stronger positive correlations with aerosol optical depth increase at Anmyeon than Jeju. In the chemical properties the aerosol are related to high concentrations in inorganic matters, SO$^4$, NO$_3$, CA2+ in fine and coarse.

• 대한간호학회지
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• 제27권4호
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• pp.831-842
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• 1997

The purpose of the study was to test the reliability and validity of the Korean version of Task Self-Efficacy Scale for activities of dally living (ADL). The Task Self-Efficacy Scale was developed by Roberts(1996) for low-intensity exercise study with older people to predict their performance of ADL. The scale was translated and back translated by bilingual persons, and then was modified to resolve variations in the translations. The Korean version of Self-Efficacy Scale for ADL was then administered to 193 elderly people including 95 hospitalized patients and 98 outpatients or healthy people. Face to face interview was used to fill out the structured questionnaire, and each interview took approximately 30 minutes. The subjects for the study were 80 women and 112 men with an age range of 65 to 95 years(M=71 years) of whom 82.6% classified themselves as moderate or quite active Most subjects(80.2%) had an education level of elementary school or less. The Self-Efficacy Scale for ADL is measured on a 0 to 10 VAS, assessing three areas of ADL : self care activities, household tasks, and motor tasks. The higher the score is, the higher person's confidence in performing ADL. Psychometric testing revealed that the scale was found to be internally consistent, showing a Cronbach's alpha of .97 The scale was significantly correlated with subjects' level of activity and subjective assessment of their health status. Moderate correlation with health-related hardiness scale also supported the validity. Factor analysis was performed to confirm whether the scale represents the three sub-areas as suggested in the literature. The results of the factor analysis led to a three factor solution according to Kaiser's criterion, but the items were not strongly and cleanly loaded for the third factor. This can be explained in that, among the three sub-ADL areas of the self-efficacy scale, the areas of self care activities and household tasks seem to have similar levels of difficulty in performance with not enough differences for the self-efficacy scale to distinguish between the two areas. Therefore, one factor solution was suggested since ADL can be seen as a unit of activities at similar level of difficulty in performance. One factor solution explained 68.1% of variance of the 19-item scale and all items were correlated over .6 with the factor, showing that the selected factor solution fits the model. The results indicated that the Korean version of Task Self-Efficacy Scale for ADL was reliable and valid in producing useful information to evaluate the effects of various interventions toward promoting health and quality of life for elderly people.

• 지역사회간호학회지
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• 제9권2호
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• pp.396-409
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• 1998

The purpose of this study is to inquire into the degree of health promotion activity of university students, and to confirm the general factors of health promotion behavior in order to offer basic data for a nursing strategy to improve health promotion behavior. For this research, data was collected from university men and women through questionnaires from February 18 to March 20 in 1998. The author develop a measuring instrument on the basis of related reviews of health promoting behavior in the prevention of chronic disease, as well as accounting for demographic factors, biological factors, and circumstanctial factors. The content validity of the instrument was authenticated by two professors of the science of nursing,. and the reliability was confirmed by a 'cronbach' ${\alpha}'$ after moditying the content through a pre-test on 30 students. 475 persons were analyzed in terms of an average, percentage, t-test, ANOVA by 'SPSS-PC'. The analyzed data was the following. 1. The acting degree of health promoting behavior was 3.26 point out of 6. Among the sub-levels of health promoting behavior, the order of importance was the following. self-actualization (4.62), interpersonal(4.60), stress management (4.0l), nutrition(3.68), responsibility(3.1l), liquid and cigaretles ues(2.85), and exercise (2.33). 2. The differences in health promoting behavior according to subject's general character were the following. Age(F=6.012, p=.003), major (F=7.243, P=.000), sex(t=7.60, P=.000), religion(F=2.454, p=.045), living status(F= 2.849, p=.024), health concern of parents(F= 7.596, P=.000), taking health programs(F= 2.710, p =.007), case history of the family( t = -1.980, p=.048). Health promoting behavior is affected by a higher age, majoring in the social sciences, having religion, male, living in the relatives' home, having to take health programs and a higher health concern of the parents. Suggestions: 1. The degree of health promoting behavior appears low in this study. It is crucial, therefore, to develop a health program to improve health promoting behavior and to study how to center the daily health life of students.

• 한국식품영양과학회지
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• 제35권5호
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• pp.588-593
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• 2006

방사선조사를 이용하여 돈피유래 올리고펩타이드를 제조하고자 하였다. 생박돈피를 chopper를 이용하여 조분쇄한 후 $-20^{\circ}C$ 아세톤으로 탈지하였고, $\gamma$-ray irradiator를 이용하여 0, 20, 40, 50, 100, 150, 200, 250, 300 kGy의 총 흡수선량을 얻도록 탈지돈피에 방사선조사를 하였다. 탈지돈피의 pH는 150 kGy이상에서 소폭 증가하였고, SDS-PAGE에서 방사선조사선량이 증가할수록 분자량 24 kDa이하의 저분자 물질이 점차 증가하였고, 효소처리를 병행했을 때 $\alpha$- 및 $\beta$-나선구조의 100 kDa 및 200 kDa의 콜라겐 밴드가 소실되는 반면에 24 kDa의 밴드가 형성되고 있으며, 방사선 조사선량이 증가할수록 10% SDS-polyacrylamide gel 하단에 콜라겐 분해 물질로 예상되는 저분자 물질이 축적되는 현상을 보였다. 방사선조사선량에 따른 수용성 단백질의 용해도, 점도 및 탁도를 측정한 결과 방사선조사선량이 증가할수록 용해도가 증가하고 점도 및 탁도가 감소하는 현상을 보였고, 방사선을 조사한 돈피에 papain 1%를 첨가하여 수용성 단백질을 추출한 경우 비 효소처리구에 비하여 점도가 낮아지는 현상을 보여 돈피 단백질이 papain에 일정수준 가수분해되고 있음을 알 수 있었다. 300 kGy로 방사선을 조사한 돈피 가수분해물을 gel permeation chromatography한 결과 분자량 9,000, 2100, 860, 170 Da의 분획물을 확인하였다. 이상의 결과는 환경오염 문제를 최소화하고 제조공정을 단순화하여 경제성 있는 콜라겐 유래 기능성 올리고펩타이드를 제조함에 있어 방사선조사기술(RT: Radiation Technology)이 고분자물질의 저분자화에 직접 이용될 수 있는 기술로 실용화되어 환경오염을 최소화할 수 있는 대체기술로 가능할 것으로 생각된다.