• 한국항공우주학회지
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• 제50권10호
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• pp.729-737
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• 2022

하반기에 발사 예정인 차세대소형위성2호(NEXTSat-2)에 탑재된 고상-액상 상변화물질 열제어장치(Phase Change Material Thermal Control Unit, PCMTCU)의 비행모델에 대한 위성 차원 열진공시험 결과로부터 융해-응고에 따른 작동과정을 분석하였다. 시험결과 PCM의 상변화는 발열부품의 온도 안정화에 기여함을 확인하였다. 시험에서 계측된 온도변화를 이용하여 타당한 정도의 정확도를 갖도록 PCMTCU의 열해석모델에 대한 보정을 수행하였다. 보정된 열해석모델로써 임무궤도의 정상 작동에 따른 PCMTCU의 주기적 온도변화를 예측하였으며, PCM의 액상분율로써 정량적 기여도를 평가하였다. 향후 임무궤도에서의 비행자료를 수신하여 PCMTCU의 우주 환경 검증을 완료할 예정이다.

• 자동차안전학회지
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• 제14권1호
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• pp.26-31
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• 2022

Changwon City has the second highest accident rate with 79.6 according to the city bus accident rate. In fact, 250,000 people use the city bus a day in Changwon, The number of accidents is increasing gradually. In addition, a recent fire accident occurred in the engine room of a city bus (CNG) in Changwon, which has gradually expanded the public's anxiety. In the case of business vehicles, the government conducts inspections with a short inspection cycle for the purpose of periodic safety inspections, etc., but it is not in the monitoring stage. In the case of city buses, the operation records are monitored using Digital Tacho Graph (DTG). As such, driving records, methods, etc. are continuously monitored, but inspections are conducted every six months to ascertain the safety and performance of automobiles. It is difficult to identify real-time information on automobile safety. Therefore, in this study, individual automobile management solutions are presented through machine learning techniques of inspection results based on driving records or habits by linking DTG data and Vehicle Inspection Management System (VIMS) data for city buses in Changwon from 2019 to 2020.

• 치위생과학회지
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• 제23권4호
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• pp.343-350
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• 2023

Background: Digital panoramic dental X-ray equipment (PDX) is frequently used by patients and dental workers for diagnosis and examination in dental institutions; however, infection control has not been properly implemented. Therefore, in this study, we aimed to systematically review the potential risk of cross-infection in the dental environment by investigating the contamination level of general aerobic bacteria and Staphylococcus aureus, which are important in hospital infections, in PDX areas that people mainly contact. Methods: This survey was conducted from March to May 2023 and covered one general hospital, three dental hospitals, and nine dental clinics equipped with PDX. Bacteria samples were collected from the left-handle, right-handle, forehead support, and head side support as the patient's contact areas, as well as the X-ray exposure switch and left-click mouse button as the dental hygienist's contact areas of the PDX. The collected bacteria were spread on Petrifilm, and colonies formed after 48 hours of culture were counted. Results: General aerobic bacteria and S. aureus were detected in all areas investigated. Significant differences in bacterial counts between different regions of the PDX were observed in both groups (p<0.001). The detection rates of general aerobic bacteria (p<0.001) and S. aureus (p<0.001) were significantly higher in the contact areas of patients than those of dental hygienists. A positive correlation was observed between the forehead and the temple region in terms of general aerobic bacteria and S. aureus detection (r=1) (p<0.01). Conclusion: Taken together, the presence of many bacteria, including S. aureus, detected in PDX indicates that PDX has a potential cross-infection risk. Our results therefore highlight the need for the development of appropriate disinfection protocols for reusable medical devices such as PDX and periodic infection prevention training for hospital-related workers, including dental hygienists.

• 한국수자원학회논문집
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• 제57권1호
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• pp.9-19
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• 2024

본 연구는 공개된 수질측정 자료를 이용하여 담수호의 수질변화추이를 분석하고 수질항목의 이상여부의 판단기준을 마련하며, 자료로부터 부영양화의 지표인 Chlorophyll-a를 예측할 수 있는 회귀모형을 구성하여 담수호 관리에 이용할 수 있는 방안을 검토하고자 하였다. 이에 따라 서해안 담수호 3개소를 선정하여 약 20년간의 수질항목자료를 회귀분석 방법으로 분석하고, 각 수질항목의 연중 주기적인 변화를 나타내는 회귀식과 신뢰도 95%에서의 표준편차를 산정함으로서 이상 여부의 판단방법을 제시하였다. 또한 불규칙한 관측일로부터 Chlorophyll-a의 시간적 변화율을 산정하고, 다른 수질항목간의 상관관계 분석 및 회귀모형을 구성하여 분석함으로서 수질측정 자료만을 이용하여 Chlorophyll-a의 변화를 예상할 수 있는 방법을 제시하였다. 본 연구결과는 통계학적 모형에 의한 근사적인 수질예측방법으로서 향후 수질측정 자료의 양적·질적 개선이 이루어진다면 담수호 수질관리에 기여할 것으로 기대된다.

• 대한치위생과학회지
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• 제1권1호
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• pp.57-63
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• 2018

The coffee demand market in Korea is growing every year, and the adults drink an average of one cup of coffee every day. In order to investigate the effect of coffee on oral malodor, 15 Korean subjects were recruited. There were no significant differences in the values of oral malodor using BB checker(Taiyo, Japan) in the factors of sex, smoking, drinking, feeling oral malodor by themselves, feeling oral malodor by others, periodic scaling, activity of Streptococcus mutans, bleeding on probing, and coffee drinking habits. Patient hygiene performance index, calculus index, index of coat on the tongue, toothbrushing time, toothbrushing frequency had no correlation with oral malodor. The difference between before and after drinking coffee with syrup(17.93±16.54) was significant, but the difference between before and after drinking coffee without syrup(1.13±14.75) was not significant. We suggested the cause of oral malodor after drinking coffee was syrup, but not coffee.

• 치위생과학회지
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• 제8권2호
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• pp.97-101
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• 2008

본 연구는 임플란트 시술에 대한 환자의 기능별 만족도를 파악하고 이와 관련된 요인을 분석함으로써 환자만족도 향상에 도움이 될 수 있는 기초자료를 제공하고자 시행되었다. 2007년 1월 3일부터 9월 30일 까지 서울 인천 경기도에 소재한 치과 의료기관에서 임플란트를 식립한 환자를 대상으로 설문조사를 하였으며, 최종 분석은 120부(92.3%)를 사용하였다. 수집한 자료는 t-test와 ANOVA 분석, Pearson 상관분석을 수행하였으며, 다음과 같은 결과를 얻었다. 1. 일반적 특성에 따른 각 기능별 만족도는 통계적으로 유의한 차이를 보이지 않았다. 2. 자가 구강위생관리에 따른 각 기능별 만족도의 차이를 분석한 결과 정기적으로 치석을 제거하고 일일잇솔질 횟수가 4회 이상인 집단에서 사회적 기능 및 심미적 기능에 대한 만족도가 가장 높은 것으로 나타났다(p < .05). 3. 저작기능에 대한 만족도는 소구치 부위에 식립하였을 때 가장 높았고, 사회적 심미적 기능에 대한 만족도는 전치 부위에서 가장 높았으나 통계적인 유의성은 없었다. 4. 사회적 기능과 심미적 기능에 대한 만족도는 치과병원에서 가장 높았으며 다음은 치과의원, 종합병원순으로 나타났다(p < .05).5. 저작기능과 사회적 기능, 심미적 기능 및 총만족도는 서로 양(+)의 상관관계를 보였고, 특히 총만족도와 사회적 기능의 만족도간에 상관계수가 가장 높은 것으로 나타났다(p < .01).

• 성인간호학회지
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• 제13권3호
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• pp.397-408
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• 2001

Currently, breast cancer ranks third among women' s cancers, and as its incidence is increasing, the incidence age is also becoming lower. Therefore it is necessary to address breast cancer for women in their twenties. As there is no way presently to prevent breast cancer, it is imperative that women take available interventions against predisposing factors. It is thus advisable that women acquire the necessary skills to recognize their own health status. The purposes of this study were to identify the effects of education on breast self-examination (BSE) through supportive education among college women during the period from August 2000 to February 2001, and to attempt to design an effective BSE educational program. The first class was implemented through lectures, pamphlets, videotapes, breast palpation on cloths, demonstration and practice for identification of breast masses through palpation using breast model. Supportive education was implemented bimonthly to the experimental group, and effects of the education between experimental and control groups were compared 6 months later. The results of this study are summarized as follows: 1. The effects on supportive education of college women in BSE 1) The mean score of retained knowledge about breast cancer and BSE was 30.88 in the experimental group, and 29.66 in the control group and significantly greater in the experimental group than in the control group (t= -2.062, p= 0.041). 2) Frequency of BSE practice was significantly greater in the experimental group than in the control group($\chi^2=0.045$, p=0,012). 3) The mean accuracy score in BSE practice was 19.10 in the experimental group, and 18.29 in the control group; accuracy was higher in the experimental group than in the control(t= -2.035, p= 0.444). 4) The mean score of self-efficacy was 35.05 in the experimental group, and 31.22 in the control group. The experimental group mean score was higher(t=-3.016, p=0.003). 2. There was a statistically significant correlation between self-efficacy and accuracy of BSE(r=0.447, p=0.000), knowledge of breast cancer and BSE(r= 0.306, p=0.000) and frequency of BSE(r=0,259, p=0,002) but no significant correlation between knowledge of breast cancer and BSE and frequency of BSE (r=0.071, p=0.403). On the basis of this study, periodic supportive education can increase knowledge of breast cancer and BSE, frequency of BSE, accuracy of BSE and self-efficacy. Suggestions: 1. There is a need to compare the effects of individual programs to acquire BSE behaviors in the young. 2. Further research is needed to test the continuity of the effects of BSE education.

• Journal of Preventive Medicine and Public Health
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• 제31권4호
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• pp.728-739
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• 1998

To improve wellness and quality of life by recognizing the health efforts of stress, the author estimated the relationships between stress, subjective symptoms and clinical diagnosis through a questionnaire and a battery of specified laboratory tests; electrocardiography, blood pressure, cholesterol, aspartate aminotransferase(AST), alanine aminotransferase(ALT), gamma glutamyl transferase$(\gamma-GTP)$, fasting blood sugar, gastro-endoscopy or UGI, abdominal sonography, etc. The data was gathered from 337 clients who were undergoing multiphasic screening program at a University Hospital from January to March 1998. The mean age of subjects was $46.5{\pm}11.2$ years and the mean of body mass index was $24.0{\pm}3.7kg/m^2$. The mean vol of stress was $18.5{\pm}6.0$ expressed as the score out of 40. By general characteristics and lift style among male, mean level of stress was significantly higher in case of lower socioeconomic status, habitual drug use, longer daily working time(>10 hours), no regular exercise, drinkers, irregular meal, skip-ping breakfast(p<0.05). In case of female, that was significantly higher in case of lower education, lowe. socioeconomic status, longer daily working time(>10 hours), no regular exercise, drinkers, smokers, irregular meal, skipping breakfast(p<0.05). Significant correlations were observed between stress and subjective symptoms in all kinds of organ system (p<0.01). Correlation coefficients of stress among male were relatively high with neuro-psychiatric symptom$(\gamma=0.476)$ and cardio-vascular symptom$(\gamma=0.361)$ in order, and correlation coefficients of stress among female was highest with neuro-psychiatric symptom$(\gamma=0.371)$. The prevalence of the diagnosis through the battery of laboratory tests was high in upper gastrointestinal disorders and hypercholesterolemia in order in both sex group. Among male the mean score of stress was significantly high in ulcerative peptic disorder of upper gastrointestine and hepatopathy in order (p<0.05) . Among female that was significantly high in diabetes mellitus. In summary, it is likely that there are associations between stress, subjective symptoms and clinical diagnosis. To promote wellness and quality of life it would be of value that periodic stress evaluation program and stress management including apropriate control of smoking and drinking, regular exercise and meal.

• 대한임상검사과학회지
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• 제43권2호
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• pp.57-67
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• 2011

In this study, we investigated the correlation between the administration of various antiviral agents and the alternation of specific biomarkers induced by the hepatitis B virus (HBV). Eligible subjects diagnosed with chronic hepatitis B were prescribed with antiviral drugs at the Gastroenterology Internal Medicine Department of E University Hospital in Daejeon between May 2004 and September 2009. Lamivudine was prescribed to 66 out of 100 patients. Of the 12 patients, 6 (50.0%) showed a change from being HBe-antigen-positive to being HBe-antigen-negative. Of the 39 patients, 23 (59.0%) showed higher than 40 IU/L alanine aminotransferase (ALT). Of the 65 patients, 41 (63.1%) showed HBV DNA decrease of 1 log, and were prescribed with Lamivudine. Adefovir was prescribed to 3 out of 100 patients. Of the 12 patients, 1 (8.3%) showed a change from being HBe-antigen-positive to being HBe-antigen-negative, and was prescribed with Adefovir. Entecavir was prescribed to 19 (19.0%) out of 100 patients. Of the 12 patients, 3 (25.0%) showed a change from being HBe-antigen-positive to being HBe-antigen-negative. Of the 12 patients, 3 (125.8%) showed higher than 40 IU/L ALT. Of the 65 patients, 14 (21.5%) showed HBV DNA decrease of 1 log, and were prescribed with Entecavir. Clavudine was prescribed to 7 out of 100 patients. Of the 12 patients, 1 (8.3%) showed a change from positive HBe antigen to negative HBe antigen. Of the 39 patients, 5 (12.8%) showed higher than 40 IU/L ALT. Of the 65 patients, 6 (9.2%) showed HBV decrease of 1 log, and were prescribed with Clavudine. These results do not show a statistically significant correlation between drugs and biomarkers. Data on combination therapy using Lamivudine and Adefovir show no statistically significant difference between drugs and biomarkers. Medications for periodic inspection was not correlated to HBe-antigen-negative conversion, ALT, and HBV DNA. HBV DNA was significantly reduced in patients with high levels of AST(aspartic acid aminotransferase) and ALT before treatment. In addition, the decrease of HBV DNA after 12 months of treatment was less frequently observed in patients treated with Lamivudine compared with other drugs. This result is associated with Lamivudine resistance. Although the association of drugs with diagnostic markers and the correct choice of treatment is difficult to determine, these results may be useful for further research on diagnosis and treatment of the hepatitis B virus.

• 한국산학기술학회논문지
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• 제19권8호
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• pp.183-192
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• 2018

본 연구는 간호대학 여학생의 음주실태, 음주동기와 문제음주의 상태 비교를 하고자 실시하였다. 연구대상자는 일부 지역 간호 대학생을 대상으로 하였고, 자료수집기간은 2018년 4월부터 5월까지이며, 분석대상은 181명 이었다. 자료 분석은 정상음주 군과 문제 음주 군과의 차이를 알아보기 위하여 빈도 분석을 사용하였고, 문제음주와의 상관관계는 Pearson's correlation을 이용하였으며, 문제음주 관련요인을 분석하기 위해 로지스틱회귀분석(Logistic regression)을 실시하였다. 그 결과 음주횟수, 마시는 속도, 음주동기, 생활스트레스, 음주문제발생경험이 문제음주에 대한 위험비가 높았다. 구체적으로 살펴보면, 음주횟수로 볼 때 음주횟수가 일 년에 1-4회인 군보다 일주일에 2-3회인 군에서 문제음주에 대한 위험비가 21.53배 높았으며, 음주동기는 음주동기가 낮은 군 보다 음주동기가 높은 군에서 5.96배, 음주문제발생경험은 음주문제발생경험이 낮은 군에 비해 음주문제발생경험이 높은 군에서 8.80배 문제음주에 대한 위험비가 높게 나타났다. 결론적으로, 여대생의 문제음주 관련 요인은 음주횟수, 마시는 속도, 음주동기, 생활스트레스, 음주문제발생경험이 관련성이 높게 나타났다. 따라서 대학생들의 음주실태와 위험요인을 파악하고, 주기적인 절주교육, 문제음주선별과 예방프로그램을 통해 문제음주가 될 위험성을 낮추고, 건전음주문화 정착을 위해 노력해야 할 것이다.