• 마이크로전자및패키징학회지
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• 제18권2호
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• pp.35-41
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• 2011

Recently, board level solder joint reliability performance of IC packages during drop impact becomes a great concern to semiconductor and electronic product manufacturers. The handheld electronic products are prone to being dropped during their useful service life because of their size and weight. The IC packages are susceptible to solder joint failures, induced by a combination of printed circuit board (PCB) bending and mechanical shock during impact. The board level drop testing is an effective method to characterize the solder joint reliability performance of miniature handheld products. In this paper, applying the JEDEC (JESD22-B111) standard present a finite element modeling of the FBGA. The simulation results revealed that maximum stress was located at the outermost solder ball in the PCB or IC package side, which consisted well with the location of crack initiation observed in the failure analysis after drop reliability tests.

• 복식
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• 제53권6호
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• pp.145-159
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• 2003

The purpose of this study was to classify body type for ready-to-wear sizes. The subjects were 300 women ages of 18-24. they were measured direct anthropometry. The body types for sizing system were divided by Rohrer Index. KS drop value and ISO drop value. The results of this study were as follows. 1. By adapting the Rohrer Index. we classify 3 types from anthropometric measurements. The thin type covered 39.3%, the standard type 51.0% and the obesity type 18.7%. The characteristics of clusters were as follows. Thin type was characterized by tall. slender type and slim. The standard type was characterized by middle sized. The obesity type was characterized by short. fat type. and large bust. 2. By adapting the KS system drop value. we classify 3 types from anthropometric measurements. The H type(drop 0) covered 25.6%. the N type(drop 6) 65.2% and the A type(drop 12) 9.2%. Type H was slightly tall large bust. and curved from waist to hip. Type A was slightly thin. large hip and smaller bust than type N. Principal factor components were bust size. The height could be divided into three groups. The Petite(l50cm) covered 5.5%. the Regular(l60cm) 64.7% and the Tall(l70cm) 29.8%. Through the crosstab of height and body type. we extracted regular height by N type 46.2% the largest cell. The body type was the higher order of N type. H type and A type. The tall was the higher order of Regular. Tall and Petite. 3. By adapting the ISO system drop value. we classify 3 types from anthropometric measurements. The H type(drop 0) covered 15.0%. the M type(drop 6) 41.0% and the A type(drop 12) 44.0%. Type H was slightly short. slightly fat and large bust. Type A was slightly tall. slight thin than type M. The height could be divided into three groups. We adjust the height section after allow for height distribution. The Short(152cm) covered 12.8%. the Regular(160cm) 66.9% and the Long(168cm) 20.3%. Through the crosstab of height and body type, we extracted regular height by M type 29.3% the largest cell. The body type was the higher order of M type, A type and H type. The tall was the higher order of Regular, Long and short.

• 한국의류학회지
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• 제21권7호
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• pp.1247-1257
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• 1997

The purpose of this study was to classify size specifications of Korean adult male for the men's ready·made garments, especially jacket and dress shirts. Concept of the comfort and fitness has become a major concern in the basic function of the ready-made garments. Data were collected by the real anthropometric measurement and by the photographic sources. Sample size was 1.290 subjects as the sample and their age range was from 19 to 54 pean old by the stratified sampling method. 66 variables from the direct anthropometric data in total were applied to analyze. ANOVA in SAS package was applied to the data and the expected frequency distribution of 10.000 men was calculated by the extraction of density function. Control dimensions for jacket and dress shirts has been designated by Bcorean Apparel Sizing System (KS-K). Therefore this study was performed to classify size specifications by the control dimensions and at the same interval of KS-K. The drop values of 15, 12 and 9 has the high coverage rate of 22.1%, 21.0% and 18.8% respectively and are composed of the majority of 61.9% of the subjects. According to the drop values, size specifications and distribution of control and reference dimensions are predicted. About 65.75% of the expected frequency distribution without stature were covered by 19 size specification.

• 한국분무공학회지
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• 제3권1호
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• pp.27-33
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• 1998

Correlations of drop size and velocity in a spray from the disintegration of liquid jet and liquid film from an internal mixing twin-fluid atomizer, were determined by phase Doppler method. The distribution pattern of Sauter mean diameter(SMD) in a spray was changed by a behavior of liquid flow. As smaller droplets became faster and slower easily by the surrounding conditions, the correlation between drop size and mean velocity was found to be varied as next 3 steps; firstly smaller droplets have a higher mean velocity at the area near atomizer, droplets have almost the same mean velocity and finally larger droplets have a higher mean velocity at the area far from an atomizer.

• Journal of Welding and Joining
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• 제13권2호
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• pp.42-52
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• 1995

In the evaluation of aging degradation on the structural materials based on the fracture mechanics, the detection and size prediction of defect are very important. Aiming at nondestructive detection and size prediction ol defect with high accuracy and resolution, therefore, an lnduced Current Focusing Potential Drop(ICFPD) technique has been developed. The principle of this technique is to induce a focusing current at an exploratory region by an induction wire flowing an alternating current(AC) that is a constant ampere and frequency. Defects are assessed with the potential drops that are measured the induced current on the surface of metallic material by the potential pick-up pins. In this study, the lCFPD technique was applied for evaluating the location and size of the surface crack and blind crack made in plate specimens, and also for detecting the defects existing in valve, a field component, that were developed by SCC etc. during the service. The results of this present study show that surface crack and blind crack are able to defect with potential drop. these cracks are distinguished with the distribution of potential drop, and the crack depths can be estimated with each normalized potential drop that are parameters estimating the depth of each type crack. In the field component, the defects estimated by experiment result correspond with those in the cutting face of the measuring point within a higher sensitivity.

• 한국의류산업학회지
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• 제10권6호
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• pp.979-988
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• 2008

The purpose of this study is to analyze the lower body size and forms of married women in their thirties who have experienced pregnancy and parturition. Their measurements derived from the direct anthropometry and indirect photographic measures were compared to those of 20's. Improving consumer satisfaction for missy brand, especially in fitness of skirt and pants, some lower body classification were presented. The results were as follows : 1. The characteristics of lower body showed many differences by individuals especially in depth, girth, length and angle measures rather than height and breadth measures. Many items including index, calculations and angles revealed significant differences compared to those of 20's. Several breadth items, crotch length had distinct increase than those of women in twenties. Flattened buttocks side silhouette from waist to hip, buttocks drooping and decrease of inclination implied the influence of pregnancy, parturition and aging. 2. We hardly find out sizing system differences between missy brand and miss brand. Based on waist and hip girth measurements of subjects, sizing system of missy apparel wasn't suitable for their body size. Excessive drop(hip girth-waist girth) of missy brands, 25~30 cm, was almost the same to the drop of miss brands. 3. To improve the size satisfaction of missy women, we classified the lower body into 5 types according to drop, buttocks angle and hip length. Type 1 was small waist with large buttocks projection, and hip length was close to an average. Type 2 was small waist with medium buttocks projection, and the hip length was close to an average. Type 3 was medium waist, with average projection of the buttocks and hip length. Type 4 was large waist, projection of the buttocks and the hip length were close to an average. Type 5 was large waist, projection of the buttocks was small and the hip length was close to an average.

• 패션비즈니스
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• 제15권6호
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• pp.85-100
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• 2011

The objective of this study was to analyze body measurements, BMI and body type according to age in the male and female groups based on 3D scan body measurement data of adult men and women in their 20's~30's and to provide basic information usable in the clothing and fashion industry. For this purpose, we analyzed 3D scan body measurement data of 848 adults measured in the 6th Size Korea project and the results were as follows. First, there were differences in 3D scan body measurements according to age in the male and female groups, and in general the measurements of the height items were larger in younger adults and the measurements of the circumference, breadth and depth items were larger in older ones. Second, there were differences in 3D scan body measurements according to BMI in the male and female groups, and in general body measurements were largest in the obesity group and lowest in the underweight group. Third, BMI was different according to gender and in general BMI was higher in men and obesity and overweight were more frequent in men than in women. Moreover, BMI was significantly different according to age and was higher in the 30's than in the 20's. Fourth, the mean difference in the drop and lower drop values according to age in the male and female groups was significant, and the drop and lower drop values were lower in the 30's than in the 20's. These results are considered meaningful as data for the development of clothing size systems, patterns and grading in the areas of clothing and fashion targeting consumers in their 20's~30's.

• 대한한의학방제학회지
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• 제6권1호
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• pp.141-156
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• 1998

This histological study was performed to investigate the effects of .Paljeungsan-gagambang on the epididymal fat cell size, number and the fat drop area of hepatic lobule of rats fed High Fat Diet. Paljeungsan-gagambang was orally administered to the rats of sample group 26mg per 200g of rat's weight everyday for 4 weeks, and the control group were just fed with equal amount of saline solution. Then they are the epididymal fat cell size, epididymal fat cell numberand fat drop area of hepatic lobule that were measured. The results were summarized as follows; 1. The size of the epididymal fat cell was decreased significantly as compared with the control group. 2. The number of the epididymal fat cells was decreased significantly as compared with the control group in distribution chart classified by cell size 3. The Area(%) of the Fat drops in the hepatic lobule was decreased significantly as compared with the control group. According to the above results, it is considered that Paljeungsan-gagambang have effects on the decrease of the epididymal fat cell size, number and fat drop area of hepatic lobule of rats fed high fat diet; Thus, the adminisrtation of Paljeungsan-gagambang is considered to have an improving effect on obesities and liver diseases caused by high fat diet.

• 조명전기설비학회논문지
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• 제16권3호
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• pp.84-92
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• 2002

저압간선의 굵기는 계통의 전압강하, 간선의 포설조건별 온도 보정계수를 적용한 허용 전류 및 간션의 임피 던스 값에 따라 결정된다. 따라서, 간선의 허용전류 값올 결정하기 위하여 간선의 포셜조건에 따른 적정 보정계 수가 적용되어야 하며, 저압간선의 정확한 임피던스 값을 분석하기 위하여 간선의 종류, 간선의 규격, 포셜조건 에 따른 온도, 표피효과 및 근접 효과 둥이 고려되어야 한다. 본 연구는 저압계통의 전압강하를 고려한 간선의 굵기 산정에 대한 체계적인 설계 흐름도를 제시 하였으며, 일반적인 계산 방식에 비하여 오차가 적은 계수로서 저압간선 굵기 선정 설계 실무에 적용할 수 있는 계산 방식을 연구하였다.

• 한국의상디자인학회지
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• 제22권3호
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• pp.99-110
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• 2020

In terms of junior high school girls' growth patterns during early adolescence, are unlike childhood when relatively balanced growth patterns are found and high school years in which the normal adult body type is nearly reached, growth patterns displayed are imbalanced and rapid. In fact, diverse size changes by body part growth occur significantly different from individual to individual. Therefore, it has been hard for junior high school students to select their proper size when buying school uniforms. This study attempted to acquire basic data needed to address adolescent body shapes and school uniform patterns for junior high school girls, using the data from the 7th Size Korea Survey (2015). Specifically, it provides basic data for the development of school uniform patterns through the classification of their body into particular types, After extracting body shape components and a cluster analysis using ANOVA. According to a factor analysis conducted to determine body shape components, six factors were obtained: Factor 1: bulk and horizontal size, Factor 2: body height and length, Factor 3: shoulder shape and length, Factor 4: shape of upper body, Factor 5: lower drop, Factor 6: upper drop with a variance of 81.46%. To classify junior high school girls' body shape and determine their characteristics, a cluster analysis was performed with the variables obtained using factor analysis. Body shape was classified into three different types: Type 1 accounted for 30.7%. This was a short, slender body with the smallest bulk, size, and upper drop. Type 2 accounted for 24.9%. This was the largest in bulk and horizontal size and highest and length as well. Type 3 accounted for 44.5%. This type was close to average in terms of horizontal size, length and height, and high drop values. To develop school uniforms with great accuracy and body fit for junior high school students, there should be further studies on changes in body shape and their causes. The study results can serve as basic data for comparing branded school uniform patterns for junior high school girls and developing school uniform patterns based on body shape, using 3D virtual clothing simulations.