• Journal of Korean Neurosurgical Society
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• 제54권5호
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• pp.384-389
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• 2013

Objective : Use of quantitative computed tomography (CT) to evaluate bone mineral density was suggested in the 1970s. Despite its reliability and accuracy, technical shortcomings restricted its usage, and dual-energy X-ray absorptiometry (DXA) became the gold standard evaluation method. Advances in CT technology have reduced its previous limitations, and CT evaluation of bone quality may now be applicable in clinical practice. The aim of this study was to determine if the Hounsfield unit (HU) values obtained from CT correlate with patient age and bone mineral density. Methods : A total of 128 female patients who underwent lumbar CT for back pain were enrolled in the study. Their mean age was 66.4 years. Among them, 70 patients also underwent DXA. The patients were stratified by decade of life, forming five age groups. Lumbar vertebrae L1-4 were analyzed. The HU value of each vertebra was determined by averaging three measurements of the vertebra's trabecular portion, as shown in consecutive axial CT images. The HU values were compared between age groups, and correlations of HU value with bone mineral density and T-scores were determined. Results : The HU values consistently decreased with increasing age with significant differences between age groups (p<0.001). There were significant positive correlations (p<0.001) of HU value with bone mineral density and T-score. Conclusion : The trabecular area HU value consistently decreases with age. Based on the strong positive correlation between HU value and bone mineral density, CT-based HU values might be useful in detecting bone mineral diseases, such as osteoporosis.

• Journal of Korean Dental Science
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• 제11권1호
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• pp.1-4
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• 2018

Purpose: The aim of this study was to evaluate the ossification and maturation of the midpalatal suture in young Koreans using cone-beam computed tomography (CBCT). Materials and Methods: The study sample consisted of 40 patients with ages from 8.2 to 23.6 years who visited the Department of Orthodontics, Chung-Ang University Dental Hospital. CBCT images were taken for diagnosis. From the CBCT image, morphological stages and Hounsfield units (HU) of midpalatal suture were obtained to evaluate the midpalatal suture maturation. Spearman's correlation coefficients were calculated to analyze relationships between chronological age, morphological stage, and HU. Result: There was a wide variation in the morphology of the midpalatal suture in each age group. It showed a modest relationship between the chronological age and the degree of morphological stages. Also there was a modest relationship between the chronological age and HU. In contrast, there was a significant relationship between morphological stages and HU of midpalatal suture (P<0.01). Conclusion: CBCT images can be used for the evaluation of midpalatal suture maturation. For the estimation of the prognosis of rapid maxillary expansion, CBCT may be reliable for the assessment of the maturation of the midpalatal suture.

• Journal of Preventive Medicine and Public Health
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• 제12권1호
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• pp.24-30
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• 1979

This study was conducted to find out the most suitable weight-height index out of the $weight/height^{p}-type$ indices that could be used for the evaluation of nutritional status in an epidemiological survey and for the screening of the obesity. The subjects were chosen randomly, 2,182 males and 719 females from college students and office workers in Seoul districts. The 'best' power-type weight-height index for Korean men and women of all ages from 16 to 59 was found to be $weight/height^{1.54}$ for males and $weight/height^{1.42}$ for females. $Weight/height^2$ (Kaup index), however, was the best suited weight-height index for each age group of both sexes except that relative weight (weight/height) was considered to be desirable to apply for males of teen-aged and of over fifties and for females of over forties of age. Normal ranges of Kaup index values for males and females of each age group were presented in tables 5 and 6. These findings suggest that Koreans are generally leaner than other ethnic groups of the same sex and age.

• 디자인학연구
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• 제19권3호
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• pp.19-30
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• 2006

This study was carried out to present design guidelines for developing electric bikes which could be used for more users regardless of gender and age. Through a survey with 336 male and female respondents in Seoul aged between 10s and 70 years or older, the convenience of bicycle use and image preference by gender and age were investigated. To evaluate convenience of bicycle use, the 7 principles of universal design made by Universal Design Center were customized to fit for accessing bicycles. The following are results of statistical analysis on 301 valid data: (1) of the 7 principles, conventional bicycles were identified to be the most inconvenient in principle 6(low physical effort), followed by in principle 5(tolerance for error) and 7(size and space for approach and use). Women appeared to feel more inconvenience than men in all evaluation criteria while using bicycles. The relation between the convenience of use and users' age was not identified. (2) Preferred images by bicycle users turned out to be those of 'simple' and 'light.' By gender, male preferred more 'technical' and 'dynamic' images than female. By age, users in their 10s-20s preferred more 'individual' image than 70 years or older.

• Asian Pacific Journal of Cancer Prevention
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• 제16권7호
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• pp.2871-2877
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• 2015

Background: Urothelial carcinoma (UC) is a malignant neoplasm that most commonly occurs in the urinary bladder. The primary aim of this study was to evaluate the clinicopathologic features, recurrence and progression in patients with bladder urothelial cancer. Materials and Methods: The medical records of patients diagnosed with UC in the state pathology laboratory between January 2006 and July 2014 were retrospectively included. Carcinomas were categorized according to age, gender, histologic grade, tumor configuration, pathologic staging, recurrence status, and progression. Results: A total of 125 (113 men, 12 women) patients were examined. The mean age was 65.9 years and the male-to-female urothelial cancer incidence ratio was 9.4:1. Low-grade UCs were observed in 85 (68%) and high-grade in 40 (32%). A papillary tumor pattern was observed in 67.2% of the UCs. Cases were classified with the following pathological grades: 34 (27.2%) cases of pTa, 70 (56%) of pT1, and 21 (16.8%) of pT2. Recurrence occurred in 27 (21.6%) patients. Ten progressed to a higher stage (pT1 to pT2), and three cases to higher grade (low to high). We also analyzed the results separately for 70 (56%) patients 65 years of age and older. Conclusions: With early detection and diagnosis of precursor lesions in older patients, by methods such as standard urologic evaluation, urinary cytology, ultrasound scanning and contrast urography, and cystoscopy, in addition to coordinated efforts between pathologists and urologists, early diagnosis may reduce the morbidity and mortality of patients with urothelial carcinoma.

• Journal of Chest Surgery
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• 제26권2호
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• pp.115-121
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• 1993

Between March, 1988 and July, 1992, 114 patients underwent Open Heart Surgery under hypothermic cardiopulmonary bypass. There were 29 cases of congenital heart anomalies (25％), and 85 cases of acquired heart diseases (75％) consisting of 53 cases of valvular heart disease, 31 cases of ischemic heart disease, and a case of left atrial myxoma. The age distribution of 114 cases was 4 to 73 years, and mean age was 43 years old consisting of mean age of congenital heart disease 23, valvular heart disease 47, and ischemic heart disease 57 years old. Overall operative mortality was about 7.9％.

• 한국산업정보학회논문지
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• 제28권2호
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• pp.61-75
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• 2023

본 연구는 고령층에서도 많이 사용하는 뱅킹앱의 사용성을 평가하고자 한다. 이를 위해 모바일에서 사용될 수 있는 사용성(People At the Center of Mobile Application Development) 모델을 설명하고 60세 이상의 고령층을 대상으로 사용성 평가를 실증적으로 검증하였다. 본 연구를 위하여 은행앱을 사용해 본 경험이 있는 고령자 165명을 대상으로 SPSS 25.0를 이용해 기술통계 및 분산분석을 실시했다. 본 연구의 분석결과를 살펴보면, 효율성, 만족도, 효과성은 상대적으로 높은 점수를 보였으며, 학습가능성, 기억가능성, 오류, 인지부하는 상대적으로 낮은 점수를 보였다. 또한, 연령별 차이 검증에서 모든 변수가 연령별로 차이가 존재하는 것을 확인했다. 이러한 결과는 뱅킹앱에 대한 고령층의 사용성 평가와 연령별 차이를 확인할 수 있었다. 특히, 컨택스트 부분에 대한 보완이 필요하다는 시사점을 제시하지만, 연령이 고령층에 한정되어 일반인과의 비교가 어렵다는 점과 다양한 통제변수를 고려하지 못한 한계도 존재한다.

• Archives of Plastic Surgery
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• 제33권1호
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• pp.67-74
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• 2006

Palatoplasty using Furlow's double-opposing Z-plasty has been performed from June, 1995 to September, 1999 at Seoul National University Children's Hospital. The goal of this study is to determine the optimal timing of repair and cleft severity affecting velopharyngeal function. This is the retrospective study of patients operated by the second author. The mean age of patients was 10.53 months. The patients could be divided into three groups-isolated cleft palate(n=70), unilateral cleft lip and palate(n=88), and bilateral cleft lip and palate(n=42). To evaluate the velopharyngeal function, we used two parameters, speech evaluation and cineofluorography using DSR(digital subtraction radiography). Also, to determine the relevance between cleft severity and speech development, we measured the distance between maxillary tuberosities and cleft margins. Among 200 patients, about 96% had no or minimal hypernasality and 87% had no or mild nasal emission. The cleft width and length of soft palate seemed not to be related with the speech development. Palatoplasty at the age under 12 months resulted in less 'nasal emission' and better 'articulation' of the parameters that were assessed at the age of 7 years. It can be concluded Furlow palatoplasty shows satisfactory results and also it seems that it is better to perform the operation before the age of 12 months.

• 고려인삼학회:학술대회논문집
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• 고려인삼학회 1980년도 학술대회지
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• pp.143-150
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• 1980

The purpose of this double-blind study was to study the standardized ginseng-extract (marketed form, GINSANA), in regard to its efficacy on the reaction time, pulmonary function and general health in subjects of various age-groups. The trial was conducted as a double-blind study in a total of 120 subjectsm allocated to different groups, according to age (30 to 39 and 40 to 60 year age-groups), sex and preparation administered (ginseng/placebo). The study lasted 12 weeks and the dosage was fixed at 2 capsules per day. The rusults regarding reaction time and pulmonary function showed significant differences in favour of the GINSANA group, over the placebo group, in the 40 to 60-year-old men and women. In the self-evaluation (performance, mood, concentration) we observed a clear improvement (p < 0.001) in the subjects treated with GINSANA, with the exception of the men age 30-39 years. The results botained, which are specially related to reaction, pulmonary function, self evaluation and tolerability, have shown that GINSANA, as standardized ginseng extract, has a favourable effect on the psychic and physical functions studied. 3. Performance test in top sportsmen before and after 9 weeks' treatment with GINSANA To what extent can GINSANA influence physical performance? It is precisely we the physicians whose task it is to find drugs which in physiological amounts do not have any special pharmacodynamic effects. We were therefore interested in the preparation, GINSANA which was made available to us, since it contains a qualitatively and quantitatively standardized GINSENG EXTRACT and is not doping agent.

• 한국생활과학회지
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• 제18권1호
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• pp.201-210
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• 2009

The purpose of the study is to examine the demographic characteristics and socio-psychological factors affecting willingness to take health foods among elderly, which is to get the basic materials of educational program for helping their desirable intake of healthy food. The data were collected from 1,032 elderly subjects and analyzed by SPSS Windows Version 12.0. About forty-one percent of the respondents were taking health foods in the period of survey. The main reason of taking health foods was to maintain and improve their health. The elderly subjects were classified into three groups: (1) a group having willingness to take healthy food, (2) a group having unwillingness to take healthy food, and (3) a group having a wait-and-see attitude. According to the results of chi-square and analysis of one-way variance, there were significant differences among three groups in the variables of 'sex', 'age', 'educational level', 'marriage status', 'monthly allowance', 'eating habit', 'concerns about health', 'self -evaluation of health condition', 'self-evaluation of health condition compared to the same age', 'concerns about health foods', and 'awareness of health foods'. In addition, the result of multinomial logistic regression analysis showed that the factors affecting willingness to take health foods in the future are 'age', 'concerns about health', 'self-evaluation of health condition compared to the same age', 'awareness of health foods', and 'intake of health foods in the period of survey'.