• 제목/요약/키워드: mean height rate

검색결과 354건 처리시간 0.031초

냉각탑 주위의 장애물에 의한 재순환 현상에 관한 수치해석 (Numerical Analysis on Recirculation Generated by Obstacles around a Cooling Tower)

  • 이정희;최영기
    • 설비공학논문집
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    • 제18권7호
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    • pp.578-586
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    • 2006
  • The present study has been conducted to examine the effect of obstacles around a cooling tower and an air-guide to prevent recirculation. In order to analyze the interaction between external flow and cooling tower exit flow, the external region as well as the cooling, tower are included in computational domain. Two dimensional analysis is performed using the finite volume method with non-orthogonal and unstructured grid system. The standard ${\kappa}-{\varepsilon}$ turbulence model is used. To investigate the recirculation phenomena, flow and temperature fields are calculated with three approaches such as, the distance between cooling tower and obstacle, the allocated geometrical type, and the effect of height of obstacle. In addition, the air-guide is considered in the current computation. The mean recirculation rate increases with the height of obstacle. The effect of air-guide to reduce the mean recirculation rate is obviously observed.

상악동골이식 후 임플란트 생존율 및 골이식재의 흡수율에 관한 임상적 연구 (Clinical Study on Implant Survival and Graft Resorption Rate After Maxillary Sinus Bone Grafting)

  • 이재환;지영덕;민승기;오승환;권대근;전인철
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제32권6호
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    • pp.529-536
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    • 2010
  • Purpose: The Purpose of this study is to show the total survival rate of implants with maxillary sinus grafting and the effects that reach the survival rate by classifying types of graft materials, implant type, operation method, residual bone height and evaluate graft material resorption rate after sinus grafting Patients and Methods: 61 dental implants placed with sinus bone grafting in 24 patients at Wonkwang University Sanbon Dental Hospital were installed simultaneously or after regular healing. Various bone grafts (autograft, xenograft, allograft, alloplast) and fourth implant type (GSII, Xive, Implantium, Novel biocare) were used. All implants were investigated clinically and radiographically, being with average 20 months follow-up period after installation. Results: 3 fixtures were lost, resulting in 95.1% cumulative survival rate of 61 osseointegrated dental implant. Survival rate according to bone material type, Implant type, operation method, residual bone height, have no statistically significant differencies. The mean preoperative residual alveolar bone height was 4.75 mm, average postoperative height of graft materials 10.8 mm, vertical bone resorption rate was 10% after 2 years. Resorption rate according to operation method was 7% (simultaneous) and 5% (delayed) after 1 year. Conclusion: It can be suggested that maxillary sinus grafting may have predictable result with various bone graft materials and implant type, residual bone height, operation method

태풍 기인 연안침식 예측의 불확실성 분석: 사례연구-일산해변 (Sensitivity Analysis in the Prediction of Coastal Erosion due to Storm Events: case study-Ilsan beach)

  • 손동휘;유제선;신현화
    • 한국연안방재학회지
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    • 제6권3호
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    • pp.111-120
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    • 2019
  • In coastal morphological modelling, there are a number of input factors: wave height, water depth, sand particle size, bed friction coefficients, coastal structures and so forth. Measurements or estimates of these input data may include uncertainties due to errors by the measurement or hind-casting methods. Therefore, it is necessary to consider the uncertainty of each input data and the range of the uncertainty during the evaluation of numerical results. In this study, three uncertainty factors are considered with regard to the prediction of coastal erosion in Ilsan beach located in Ilsan-dong, Ulsan metropolitan city. Those are wave diffraction effect of XBeach model, wave input scenario and the specification of the coastal structure. For this purpose, the values of mean wave direction, significant wave height and the height of the submerged breakwater were adjusted respectively and the followed numerical results of morphological changes are analyzed. There were erosion dominant patterns as the wave direction is perpendicular to Ilsan beach, the higher significant wave height, and the lower height of the submerged breakwater. Furthermore, the rate of uncertainty impacts among mean wave direction, significant wave height and the height of the submerged breakwater are compared. In the study area, the uncertainty influence by the wave input scenario was the largest, followed by the height of the submerged breakwater and the mean wave direction.

사회복지시설 아동의 신체발육 및 영양상태 (Anthropometric and Nutrition Status of Institutional Children)

  • 정혜경;장영은
    • 대한지역사회영양학회지
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    • 제4권1호
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    • pp.3-10
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    • 1999
  • This study was designed to investigate the malnutrition rate with anthropometric indices for the nutrient intake of 74 children aged 4-12 years old in three child welfare institutions in Cheonan city. The average heights and weights of the children are much lower than the Korean average height and weight. The mean BMI is $17.0{\pm}1.53$. In terms of height-for-age, 16.0% of the samples belong to below -2 standard deviation from the mean of the reference group. In terms of weight-for-age, 16.0% of the children belong to below -2 standard deviation. In terms of weight-for-height, 4.0% of the children belong to below -2 standard deviation. The standard deviation scores(Wt/Age, Ht/Age) indicate negative signs for seventy to eighty percent of the children. This is due to the lower consumption of the important nutrients that children consumed and almost all nutrients much less than the recommended daily allowances. Special nutrition welfare policies and programs targcting child welfare institutions should be developed to provide adequate nutrition for children in residential care.

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허약아와 성장지표의 상관성에 대한 연구 (A Study on Comparison between Growth Indices of Weak Children Groups via Analyzing Bone Age and Body Composition)

  • 이혜림;한재경;김윤희
    • 대한한방소아과학회지
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    • 제28권2호
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    • pp.1-22
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    • 2014
  • Objectives The purpose of this study is to investigate the relationship between weak children and growth indices. Methods One hundred twenty-six of the first and the second grade elementary school students who didn't have to develop yet their secondary sexual characteristics answered the questionnaire. Their bone age and body composition were measured. Results 1. According to the Weak Children questionnaire analysis, respiratory problem was one of the biggest problems in the weak children group (35.7%), followed by digestive problems (23.0%), psycho-neurological problems (22.2%), neuromotor problems (9.5%), and urogenital problems (8.7%). 2. From the comparison between growth indices of weak children and that of normal children are as follows: 1) The group of children who had problem in their digestive system had lower growth indices than the normal average children group. The growth indices includes mean height, weight, total body water, protein mass, mineral mass, body fat, skeletal muscle mass, body fat percentage, body mass index (BMI), and basal metabolic rate (BMR). 2) The children who had urogenital weakness had lower mean height, RH (Recent Height), RH - MPH {Recent Height(%) - Mid-Parental Height(%)}, RUS (Radius, Ulna and Short bone) score, weight, protein mass, body fat, BMI, and visceral fat than the normal children group. 3. The results of the multiple comparisons of growth indices and weak children groups are as follows: 1) Digestive weak children were the lowest in total body water, protein mass, mineral mass, skeletal muscle mass, and basal metabolic rate. 2) Urogenital weak children were the lowest in height, RH, RH - MPH, RUS score, and weight. Conclusion These results showed that children's growth is strongly correlated to their own growth problems, especially to those children who have digestive and urogenital problems. Therefore, this may be an effective way for children growth treatment in Korean medicine to treat weak symptoms.

상악동골이식과 임프란트 식립에 관한 후향적 임상 연구 : $7{\sim}41$개월간의 경과관찰 (CLINICAL RETROSPECTIVE STUDY OF SINUS BONE GRAFT AND IMPLANT PLACEMENT)

  • 김영균;윤필영;임재형
    • Maxillofacial Plastic and Reconstructive Surgery
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    • 제30권3호
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    • pp.249-257
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    • 2008
  • The authors performed the clinical and radiographic evaluation in the 29 patients with sinus bone graft and $Osstem^{(R)}$ implant placement between Sep 2003 and Jan 2006 and got the following results. 1. Fifteen complications developed in the 13 patients. Intraoperative sinus membrane perforation and postoperative maxillary sinusitis developed frequently. 2. The mean preoperative residual alveolar bone height was 4.5 mm, postoperative height 18.5 mm, height 1 year after operation 16.9 mm. 3. Three primary osseointegration failures(3.7%) developed in 3 patients. 4. The survival rate of prosthodontics was 100% at the final follow up. The mean marginal bone resorption around the implants was 0.69 mm 1 year after prosthodontic loading. Marginal bone resorption more than 1.5 mm developed in nine implants and the success rate was 88%.

측면적계측에 의한 하악골 성장에 관한 연구 (A LONGITUDINAL STUDY OF CHANGE IN MANDIBULAR LATERAL SURFACE AND ITS RELATIONSHIP TO THE BODY HEIGHT)

  • 정규림;이기수
    • 대한치과교정학회지
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    • 제17권2호
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    • pp.215-221
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    • 1987
  • This study was designed to investigate the growth amount and rate of mandible by the measurements of mandibular lateral surface and the relationship of peak growth increments between mandible and body height The sample consisted of twenty-five boys and fifteen girls between the ages of 6 and 13 The surface of mandible was measured from digitized roentgenocephalometric analysis (A 27 point mandibular model) The findings of this study can be summarized as follows 1 No significant difference was found between mandibular lateral surfaces of the both sexes at the ages studied. 2 The mean growth amount of mandibular lateral surface from 6 to 13 years of ages was $9\;09cm^2$ in boys and $8\;29cm^2$ in girls, and the mean growth rate was 46 07% in boys and 42 57% in girls 3 The prepubertal peak growth increment in mandible was found between the ages of 11-12 in girls and 12-13 in boys 4 The prepubertal peak growth increments of mandible occured one year later that of body height in boys and girls.

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성장기 소녀의 초경에 따른 비만도 및 성장 발달 비교 (Comparison of Obesity and Growth Development in Menarcheal and Nonmenarcheal Girls)

  • 김은경;이선희
    • 대한영양사협회학술지
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    • 제9권2호
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    • pp.106-113
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    • 2003
  • The purpose of this study was to compare the growth development between age-matched 51 postmenarcheal girls (mean age 153.1$\pm$5.8 month) who were rapidly maturing and 51 premenarcheal girls (mean age 153.1$\pm$5.7 month) who were slowly maturing. Anthropometirc measurements were taken for height, body weight, body fat(%), waist and hip circumferences of subjects. These measurements of menarcheal girls were significantly higher than those of nonmenarcheal girls. There was no significant difference in BMI distribution between two groups. However, 43.2% and 20.0% respectively in the menarcheal and nonmenarcheal girls had body fat levels of 30% or above. There were significant differences in the anthropometric measurements during past 4 years from 3rd grade elementary school to present. The greatest difference between the two groups were the amount and the rate of increased height and body weight from age 9 to 10. Among menarcheal girls, height, body weight, BMI, and Röhrer index were positively related to the onset of menarche. Distinctively, there was a stronger relationship between age at menarche and anthropometric measurements when the girls were 5th grade elementary school children. These findings support that during childhood and puberty, obese girls grow faster and have earlier menarche. Furthermore, the importance of prevention of obesity was recognized in order to accelerate growth of height among the girls by delaying the age of menarche.

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The Analysis of Patterns and Risk Factors of Newly Developed Vertebral Compression Fractures after Percutaneous Vertebroplasty

  • Yoo, Chai Min;Park, Kyung Bum;Hwang, Soo Hyun;Kang, Dong Ho;Jung, Jin Myung;Park, In Sung
    • Journal of Korean Neurosurgical Society
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    • 제52권4호
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    • pp.339-345
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    • 2012
  • Objective : The purpose of this study was to investigate the patterns and the risk factors of newly developed vertebral compression fractures (VCFs) after percutaneous vertebroplasty (PVP). Methods : We performed a retrospective review of the 244 patients treated with PVP from September 2006 to February 2011. Among these patients, we selected 49 patients with newly developed VCFs following PVP as the new VCFs group, and the remaining 195 patients as the no VCFs group. The new VCFs group was further divided into 2 groups : an adjacent fractures group and a nonadjacent fractures group. The following data were collected from the groups : age, gender, body weight/height, body mass index (BMI), bone mineral density (BMD) score of the spine and femur, level of initial fracture, restoration rate of anterior/middle vertebral height, and intradiscal cement leakage, volume of polymethylmethacrylate (PMMA). Results : Age, gender, mean body height/weight, mean BMI and volume of PMMA of each of the group are not statistically significantly associated with fractures. In comparison between the new VCFs group and the no VCFs group, lower BMD, intradiscal cement leakage and anterior vertebral height restoration were the significant predictive factors of the fracture. In addition, new VCFs occurrence at the adjacent spines was statistically significant, when the initial fracture levels were confined to the thoracolumbar junction, among the subgroups of new VCFs. Conclusion : Lower spinal BMD, the greater anterior vertebral height restoration rate and intradiscal cement leakage were confirmed as risk factors for newly formed VCFs after PVP.

서울시내 일부 여고생의 食行動 및 家族環境과 관련된 營養攝取樣相 조사연구 (A Study on Nutrition Intake Related to Food Habit and Family Environmental Factor of High School Girls in Seoul)

  • Kim, Hyong Ran
    • 한국환경보건학회지
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    • 제12권2호
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    • pp.49-66
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    • 1986
  • The purpose of this study was to investigate nutrition intake of high school girls related to food habit, physical status, family environmental factor. The survey of 216 high school girls, aged 15 to 17 years old in Seoul area was conducted from April, 21 to 30, 1986. Food habit and family environmental factor were researched by means of questionnaires and nutrition intake was surveyed. by recording the kinds, amounts and ingredients of foods taken by the girls for two days, and height and weight were also measured during the period. The findings are summarized as follows: 1. Mean value of height and weight of the girls were 157.6cm and 50.9kg. 2. Number of family members per household was 5.2. Mean value of father's age was 47.1 and mean value of mother's age was 43.6. 44.9% of the girls had fathers who graduated the college, 41.6% of the girls had mothers who graduated the high school and 29.2% of the girls had mothers who had the job. 3. Breakfast missing rate was high, most of the reason for breakfast missing was 'have no time to eat' and time for breakfast was short. 64.4% of the girls had meal irregularly. 4. Mean daily intake of all nutrients except vitamin A and riboflavin was higher than Recommended Dietary Allowances. Mean caloric intake was 89.8% of R.D.A.. Breakfast intake of energy and most of nutrients was less than snack. Mean meal balance score was 47.9 and mean food diversity score was 13.4. 5. Mother's education level was related to intake of protein and calcium and height. Breakfast and lunch missing and number of snack intake were related with nutrition intake.

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