• 대한임상검사과학회지
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• 제44권3호
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• pp.136-141
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• 2012

The hearts of highly trained athletes show morphologic and electrocardiographic (ECG) changes that suggest the presence of cardiovascular disease, including sinus bradycardia, a striking increase in precordial R-wave or S-wave voltages, ST segment depression, and T-wave inversions. Despite a number of previous observational surveys, the determinants of abnormal ECG patterns in trained athletes remain largely unresolved. In this study, we compared the electrocardiographic characteristics of athletes to determine any sensitive indicators. Comparison between ECG patterns and cardiac physiology was performed in 21 junior athletes and 25 untrained subjects with no signs of cardiac disease. Sinus bradycardia was detected in a subset of athletes but not statistically significant between the athletes ($69.9{\pm}11.1bpm$) and the control ($72.7{\pm}9.9bpm$) group. The mean values of the PR and QTc intervals in the athletes' group were $149.2{\pm}15.4ms$ and $402.3{\pm}28.8ms$, respectively. Also, there were no significantly differences between control group and the athletes' group. In addition, the athletes demonstrated a spectrum of alterations in the 12-lead ECG pattern, including marked increase in precordial R-wave or S-wave voltages ($$SV_1+RV_5{\geq_-}35mm$$, 23.8%), QRS duration ($${\geq_-}90ms$$, 90.5%), suggestive of left ventricular hypertrophy. However, left axis deviation, ST segment depression, and T-wave changes in V5, V6 were not observed in either the athletes or control group. Our findings suggest that sinus bradycardia, precordial R-wave or S-wave voltages, and QRS duration seem to be more sensitively detected in athletes than in control group. Further researches on the electrocardiographic patterns of athletes should be carried out to improve the sensitivity and specificity of diagnostic criteria.

• 한국병원경영학회지
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• 제12권1호
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• pp.75-99
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• 2007

The purpose of this study was to provide basic materials needed to enhance quality of organizational life by identifying the improvements of labor union management in the perspective of general hospital organization management. The subjects of this study were 428 employees in 8 Hospitals in Metro Capital including Seoul. Materials were collected from administrators, nurses and medical technicians in target hospitals from November 10 to November 30, 2006 through survey questionnaires. The main results of this study were as follows: 1. The commitment level of the subjects according to their characteristics was higher in older employees than the younger ones, large family to support than small family to support and those who had higher positions in labor union. 2. The commitment level of the subjects according to the Job and role related variables were higher those who had higher satisfaction level to their job, role conflict in all hospitals. 3. The commitment level of the subjects according to union related variables, variables jointly controlled by union and employer was statistically significant positive correlation. 4. The results of multiple regression analysis shows that formal and informal socialization, satisfaction with the labor union's were all found as important antecedents of labor union commitment. 5. The results of AMOS shows that structure characteristics of hospital, Job and manager satisfaction, socialization were statistically significant labor union satisfaction. The satisfaction level of labor union was statistically significant labor union commitment To summarize study results, the level of commitment in labor union depends on job satisfaction, managers' attitudes, union satisfaction factors, their colleagues attitudes toward union. Therefore hospital managers should have democratic and flexible attitudes toward labor union. Additionally, as formal and informal socialization is important determinant in union commitment, hospital managers should have countermeasures to enhance the colleague attitude and job satisfaction level of hospital employees. Moreover, as managerial factors of the principal of hospital influence union commitment directly, the attitudes of hospital managers toward union and transparency of hospital management should be improved.

• 대한불안의학회지
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• 제11권1호
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• pp.69-74
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• 2015

Objective : Positive psychotherapy is based on the premise that positive thoughts and satisfaction with life are determinants for improving the symptoms of depressive disorder. This article highlights the effectiveness of group positive psychotherapy on the elderly living alone with depressive disorder in Korea. Methods : A total of 25 Korean elderly living alone with depressive disorder participated in group positive psychotherapy. The participants completed the Hamilton rating scale for depression (HAMD) and the Positive Thinking Questionnaire (PTQ) before and after the group positive psychotherapy. Results : The HAMD and PTQ scores of the participants after the group positive psychotherapy were higher than before the psychotherapy. A correlation between the age of patients and improvement of symptoms after group positive psychotherapy was found : the older the patients were, the better the improvements were. Conclusion : The study shows that group positive psychotherapy in the elderly living alone is effective in improving the symptoms of depressive disorder. The participant's age was found to be a factor that affects the improvement of depressive disorder symptoms.

• 대한치과교정학회지
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• 제45권2호
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• pp.74-81
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• 2015

Objective: The purposes of this study were 1) to classify lingual dental arch form types based on the lingual bracket points and 2) to provide a new lingual arch form template based on this classification for clinical application through the analysis of three-dimensional virtual models of normal occlusion sample. Methods: Maxillary and mandibular casts of 115 young adults with normal occlusion were scanned in their occluded positions and lingual bracket points were digitized on the virtual models by using Rapidform 2006 software. Sixty-eight cases (dataset 1) were used in K-means cluster analysis to classify arch forms with intercanine, interpremolar and intermolar widths and width/depth ratios as determinants. The best-fit curves of the mean arch forms were generated. The remaining cases (dataset 2) were mapped into the obtained clusters and a multivariate test was performed to assess the differences between the clusters. Results: Four-cluster classification demonstrated maximum inter-cluster distance. Wide, narrow, tapering, and ovoid types were described according to the intercanine and intermolar widths and their best-fit curves were depicted. No significant differences in arch depths existed among the clusters. Strong to moderate correlations were found between maxillary and mandibular arch widths. Conclusions: Lingual arch forms have been classified into 4 types based on their anterior and posterior dimensions. A template of the 4 arch forms has been depicted. Three-dimensional analysis of the lingual bracket points provides more accurate identification of arch form and, consequently, archwire selection.

• Imaging Science in Dentistry
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• 제44권1호
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• pp.37-41
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• 2014

Purpose: The aim of this study was to investigate the accuracy of cone-beam computed tomography (CBCT) in the diagnosis of vertical root fractures in a tooth with gutta-percha and prefabricated posts. Materials and Methods: This study selected 96 extracted molar and premolar teeth of the mandible. These teeth were divided into six groups as follows: Groups A, B, and C consisted of teeth with vertical root fractures, and groups D, E, and F had teeth without vertical root fractures; groups A and D had teeth with gutta-percha and prefabricated posts; groups B and E had teeth with gutta-percha but without prefabricated posts, and groups C and F had teeth without gutta-percha or prefabricated posts. Then, the CBCT scans were obtained and examined by three oral and maxillofacial radiologists in order to determine the presence of vertical root fractures. The data were analyzed using IBM SPSS 20.0 (IBM Corp., Armonk, NY, USA). Results: The kappa coefficient was $0.875{\pm}0.049$. Groups A and D showed a sensitivity of 81% and a specificity of 100%; groups E and B, a sensitivity of 94% and a specificity of 100%; and groups C and F, a sensitivity of 88% and a specificity of 100%. Conclusion: The CBCT scans revealed a high accuracy in the diagnosis of vertical root fractures; the accuracy did not decrease in the presence of gutta-percha. The presence of prefabricated posts also had little effect on the accuracy of the system, which was, of course, not statistically significant.

• 노동경제논집
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• 제27권2호
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• pp.139-159
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• 2004

10년 이상 장기복무한 후 제대한 군인의 사회에서 재취업률은 최근 들어 연평균 30%에도 미치지 못하는 실정으로 향후 군비축소에 따른 국방인력 감축까지 고려한다면 제대군인의 실업문제는 매우 우려할 수준에 와 있다. 본 연구는 장기복무 제대군인들의 전역 후 취업진로 결정에 영향을 미치는 요인을 설문조사를 통해 도출한 후 계량분석하였다. 결과를 요약하면, 봉급생활을 선택한 집단에 비해 자영업을 선택한 집단이 배우자의 소득이 높은 것으로 나타났으며, 경제활동을 포기한 계층은 군복무 기간이 더 길고 계급도 높으며, 질병이나 장애가 있는 경우로 나타났다. 그리고 군복무 기간이 길수록, 직업보도교육에 참여하지 않은 사람일수록 제대 후 첫 직장탐색 기간이 단축되는 반면, 교육수준이 높을수록, 가장 오래 복무한 지역이 서울 지역인 사람이 여타 지역 근무자에 비해 직장탐색 기간이 길어진다는 결과를 얻었다.

• Journal of Preventive Medicine and Public Health
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• 제26권1호
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• pp.37-48
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• 1993

This study was conducted to investigate the prevalence rate of low back pain during past one year and its risk factors. The data were collected from 1,384 manufacturing factory workers from March 1, 1992 to August 30, 1992. The results obtained were as follows: 1. The one year prevalence rate of low back pain by manufacturing company was 38.4% in textile manufacturing, 35.2% in concrete reenforcement, 31.0% in cigarette and 26.1% in metal part(P<0.01). 2. In textile manufacturing, age groups with high prevalence rate of low back pain were 30's(36.8%) and 40's(36.4%) (P<0.05), and the one year prevelence rates of low back pain by marital state were 34.9% in married workers and 28.5% in unmarried(P=0.0511). 3. The one year prevelence rates of low back pain by job part are 35.0% in labor workers and 26.1% in clerical(P<0.05), and by work hour per day it was 34.9% in 9 or more and 28.9% in 8 or less(P<0.05). 4. The highest group of low back pain by work posture was 43.5% in 'lifting and transfering materials', and it by fitness of chair was 56.0% in uncomfortable one, and by height of working board was 33.6% in low working one. 5. In logistic regression analysis, significant determinants with low back pain were marital state(p<0.05), work hour per day(P<0.05), height of working board(P<0.01), and work posture(P<0.01).

• 디자인학연구
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• 제16권1호
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• pp.251-260
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• 2003

근무환경을 개선함으로써 업무효율이 높아지는 것이 자명한 상황에서 사무환경의 중요한 요소인 공간구획용 패널의 연구 개발은 필수적이다. 단순히 물리적 환경만이 아니라 심리적, 생리적, 경제적 환경까지 고려할 때 조립형 벽체 패널의 요구 조건으로는 차음/흡음 성능, 통신설비 설치 용이성 등을 포함한 기능적 요소, 최초 설치비용, 재활용성, 설치 용이성 등의 경제적 요소, 최종 마감 재질 및 형태 둥을 통한 시지각적 만족도를 위한 심미적 요소, 구조적 안정성, 건강성 등을 포함하는 안전 요소 등이 포함된다. 제품 개발을 통한 분석 결과, 재활용성을 높이고 현장작업의 축소 및 제품완성도를 높이기 위해 프레임식 구조의 장점을 살린 패널식 구조의 연구가 요구된다. 공장에서 많은 공정이 이루어질 수 있는 패널식 부재는 제품의 완성도를 높일 수 있는 장점이 있으나 시공현장에서의 융통성이 떨어질 수 있다. 따라서 현장 조건의 완성도가 낮아 발생하는 문제를 보완할 수 있는 디테일의 개발이 요구된다. 더불어 환경적 쾌적성에 영향을 주는 차음 및 흠음 성능, 안전과 건강을 고려한 디자인 및 재료에 대한 지속적 연구가 요구된다.

• 한국인구학
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• 제26권2호
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• pp.91-110
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• 2003

고위험 음주는 개인 건강 뿐 아니라 사회에 막대한 부담을 초래한다. 본 연구는 보건복지부와 서울대학교외 건강위험요인 전국조사 자료에 중도 절단 이변량 프로빗 모형(bivariate probit model with censoring)을 활용하여 한국 사회에서 15세 이상 인구계층의 고위험 음주에 미치는 요인을 규명하였다. 연구결과에 따르면 우리나라에서 소주가 음주 주종 중 고위험 음주와 가장 관련성이 큰 주종임이 밝혀졌다. 그동안 소주의 문제점에 관해서는 대부분 인식하고 있었으나 전국 조사 자료 및 최신 통계분석방법을 적용한 연구가 전무하여 실증적인 뒷받침이 되지 않았던 사실이 밝혀진 셈이다. 또한 나이가 많은 계층, 배우자와 동거하지 않는 계층, 경제활동에 종사하는 계층, 스트레스에 취약한 계층, 다양한 주종을 소비하는 계층이 각각 상대적으로 그렇지 않는 계층에 비해 고위험 음주를 할 가능성이 높았다. 본 연구결과로써 한국 사회에서 음주로 인한 위해를 감소시키기 위해서는 주종별로 차별화된 정책과 함께 고위험 음주 가능성이 상대적으로 높은 인구계층을 대상으로 정부 및 민간 노력이 집중되어야 한다는 정책적 시사점을 도출할 수 있었다.

• Journal of Microbiology and Biotechnology
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• 제26권2호
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• pp.270-276
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• 2016

Extended-spectrum β-lactamases (ESBLs), particularly those of the CTX-M types, are the predominant resistance determinants of Escherichia coli that are rapidly spreading worldwide. To determine CTX-M types, E. coli isolates were collected from retail chickens (n = 390) and environmental samples from chicken farms (n = 32) and slaughterhouses (n = 67) in Korea. Fifteen strains harboring bla_CTX-M genes were isolated from 358 E. coli isolates. The most common CTX-M type was eight of CTX-M-15, followed by six of CTX-M-1 and one of CTX-M-14. The bla_CTX-M genes were identified in the isolates from retail chickens (n = 9), followed by feces, water pipes, floors, and walls. Conjugations confirmed the transferability of the plasmids carrying bla_CTX-M genes to the recipient E. coli J53 strain. Furthermore, eight addiction systems carried by the replicons in CTX-M types were confirmed. The dominant system was identified as ccdAB, vagCD, and pndAC in donor strains and transconjugants. The clonal relationship between the two strains carrying bla_CTX-M genes indicates that E. coli may transmit from the farm to retail chickens, suggesting a possible public health risk. Our findings demonstrate that the detection of CTX-M types in E. coli isolates is important for tracking ESBL production in animals, and suggest linkage of multiple addiction systems in plasmids bearing bla_CTX-M genes.