• 한국의류학회지
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• 제26권10호
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• pp.1467-1477
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• 2002

This study was investigated physical properties of stretch fabrics by KES-FB system to show suitable basic data to making skirts of excellent capacity and develop more organized basic skirt pattern by fitness evaluation. 1. The results of T. H. V.(Total Hand Value) were as followa: In the kind of blending fiber, cotton/spandex was more excellent than nylon/spandex and polyester/spandex, in the direction of stretch, one-way(weft inserted polyurethan yarn) polyester/spandex and cotton/spandex were higher than two-way(warp and wet inserted polyurethan yarn) polyester/spandes and cotton/spandex, two-way nylon/spandex was higher than one-way nylon/spandex. 2. The results of calculating the variance between sample stretch fabrics and Japanese s/s women's suit fabrics after standardizing were as follows: Stretch fabrics has 2 range of tensile, bending, shearing, compression, surface, thickness and weight as compared with Jpanese s/s women's suit fabrics. In the tensile property, one-way stretch fabrics were almost the same with Japanese s/s women's suit fabrics, only two-way polyester/spandex had+1～+2 range. In the bending, shear property, there was no difference between sample fabrics and Japanese s/s women's suit fabrics 3. In the total fitness of the skirt, nylon/spandex is the best in the fabrics and one-way stretch fabric is better than two-way strethch fabric.

• 한국운동역학회지
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• 제25권1호
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• pp.11-19
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• 2015

Objective : The purpose of this study was to analyze the correlation between physical factors (X-factor, X-factor stretch) and club factors (club speed, ball speed, club path, smash factor, vertical launch angle, spin rate, flight time, total length) during impact and it affect on the total distance of the ball during a golf driver swing. Background : There were not enough studies that analyzed the correlation between physical factors(X-factor, X-factor stretch) and club factors(club speed, ball speed, club path, smash factor, launch angle, spin rate, flight time, total length) during a purpose swing to increase total distance. Method : For this study, 9 right handed professional male golfers (KPGA) were chosen. The test subject group used their own drivers and each took a total of 10 swings. These swings consisted of 5 purpose swings to increase total distance and 5 normal swings. Results : The purpose swing to increase total distance showed larger physical factors(X-factor, X-factor stretch) compared to a normal swing however the results were not statistically significant. Total distance increased during a purpose swing as a result of ball and club speed. Conclusion : The results showed that club factors, ball speed and club speed contributed the most in affecting the total distance of the ball during a purpose swing.

• 대한산업공학회지
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• 제40권6호
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• pp.642-647
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• 2014

In this paper, a hybrid genetic algorithm (HGA) approach is proposed for an n-job, m-machine flow shop scheduling problem with limited capacity buffers with blocking in which the objective is to minimize the total stretch. The stretch of a job is the ratio of the amount of time the job spent before its completion to its processing time. HGA adopts the idea of seed selection and development in order to improve the exploitation and exploration power of genetic algorithms (GAs). Extensive computational experiments have been conducted to compare the performance of HGA with that of GA.

• Management Science and Financial Engineering
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• 제20권2호
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• pp.33-37
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• 2014

A flow shop scheduling problem involves scheduling jobs on multiple machines in series in order to optimize a given criterion. The flow time of a job is the amount of time the job spent before its completion and the stretch of the job is the ratio of its flow time to its processing time. In this paper, a hybrid genetic algorithm (HGA) approach is proposed for minimizing the total stretch in flow shop scheduling. HGA adopts the idea of seed selection and development in order to reduce the chance of premature convergence that may cause the loss of search power. The performance of HGA is compared with that of genetic algorithms (GAs).

• 산업경영시스템학회지
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• 제37권4호
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• pp.187-192
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• 2014

Lot-streaming is the process of splitting a job (lot) into sublots to allow the overlapping of operations between successive machines in a multi-stage production system. A new genetic algorithm (NGA) is proposed for an n-job, m-machine, lot-streaming flow shop scheduling problem with equal-size sublots in which the objective is to minimize the total stretch. The stretch of a job is the ratio of the amount of time the job spent before its completion to its processing time. NGA replaces the selection and mating operators of genetic algorithms (GAs) by marriage and pregnancy operators and incorporates the idea of inter-chromosomal dominance and individuals' similarities. Extensive computational experiments for medium to large-scale lot-streaming flow-shop scheduling problems have been conducted to compare the performance of NGA with that of GA.

• 생태와환경
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• 제40권2호
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• pp.273-284
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• 2007

동물플랑크톤의 공간적 시간적 동태 변화에 대해서 섬진강 중하 류(하구언 댐 무)및 영산강 중 하류(하구언 댐 유)약 100 km구획 내에서 2004년 11월부터 2006년 8월까지 월 간격으로 조사하였다. 두 수계 내 동물플랑크톤 생체량의 공간적 변이는 뚜렷하였다. 영산강 조사 구획 내 총 동물플랑크톤 밀도의 종적 변이는 뚜렷하였다. 강 하류 지역의 하구언 댐으로 향할수록 총 동물플랑크톤 밀도가 증가하였다. 이에 반해 섬진강의 조사 구획 내 총 동물플랑크톤 밀도 변이는 통계적으로 유의하지 않았다. 영산강 구획 내 평균 총 동물플랑크톤 밀도는(평균범위: $199{\sim}817$ 개체수 $L^{-1}$), 3 조사지점, n=20) 섬진강 구획 내 평균 총 동물플랑크톤 밀도(평균범위: $4{\sim}60$개체수 $L^{-1}$, 4 조사지점, n=20)보다 약 $4{\sim}60$ 배 정도 높았다. 영산강 수계(총 동물플랑크톤 밀도의 86% 이상)에서 윤충류의 상대 풍부도는 섬진강 수계에 비해 현저히 높았다. 두 수역에서 우점 한 종은 Polyarthra spp., Brachionus spp., Colurella spp., 및 Keratella spp. 였다. 섬진강 구획 내에서의 요각류의 탄소 생체량은 강 하류로 향할수록 증가하였다(총 동물플랑크톤 탄소 생체량의 40% 이상). 식물플랑크톤에 대한 총 동물플랑크톤 섭식률의 평균 범위는 영산강 구획 내에서는 $21.2{\sim}92.6mL\;L^{-1}\;D^{-1}$이며, 섬진강 구획 내에서는 $2.1{\sim}2.6mL\;L^{-1}\;D^{-1}$의 변동 범위를 보였다. 동물플랑크톤의 섭식률을 고려 해 볼 때, 영산강 구획 내에서 동물플랑크톤에 의한 플랑크톤 먹이환내에서의 역할의 중요성이 섬진강 구획 내에서 보다 상대적으로 높을 것으로 사료된다.

• 정형스포츠물리치료학회지
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• 제14권2호
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• pp.91-97
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• 2018

Purpose: The purpose of this study was to observe the effects of sport massage and McKenzie stretch exercise on forward head posture. To understand the effect, this study measured and analyzed body alignment of the neck. Methods: In this study, a total of 14 subjects with forward head posture were analyzed. Subjects were divided into two groups: group 1 (n=7) received a McKenzie stretch exercise and group 2 (n=7) received a McKenzie stretch exercise and a sport massage. The McKenzie stretch exercise was performed three times a week, for four weeks, while the sport massage was performed once a week. The body alignment of the neck (CVA, CRA) was measured using a goniometer. Results: The improvements in neck body alignments (CVA, CRA) after the McKenzie stretch exercise and sport massage were both significant (group 1: p<0.05; group 2: p<0.05), whereas the between-group comparison found no significant differences. Conclusions: In conclusion, our study confirmed that the McKenzie stretch exercise and sport massage had a significant positive effect on the body alignment of the neck. However, a study that included a greater number of subjects and a long-term treatment period is needed to generalize these results.

• 한국전자거래학회지
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• 제20권1호
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• pp.79-88
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• 2015

웹 서버나 데이터베이스 서버와 같은 컴퓨터 서버들은 연속적으로 리퀘스트 스트림을 받는다. 이런 서버들은 유저들에게 최선의 서비스를 제공하기 위해 리퀘스트들을 스케줄링하여야 한다. 이 논문은 분할 가능 리퀘스트들을 스케줄링할 때 총 스트레치를 최소화하기 위해 혼합 유전자 알고리즘을 제안한다. 리퀘스트의 스트레치는 리퀘스트가 시스템에 머무는 시간에 대한 반응 시간의 비율로 정의된다. 혼합 유전자 알고리즘은 유전자 알고리즘의 활용과 탐구 능력를 개선하기 위해 시드 선택과 개발의 아이디어를 도입하였다. 혼합 유전자 알고리즘과 유전자 알고리즘의 성능을 비교하기 위하여 광범한 컴퓨터 실험이 실행되었다.

• 대한안전경영과학회지
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• 제17권1호
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• pp.139-148
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• 2015

For design research of teenagers' posture correcting shirt, postures of teenagers were analyzed and became the base of inventing suitable patterns. The subjects of this study were 198 of both female and male middle school students from the city of Seoul. Students' postures in classroom and length change of body surface were observed and analyzed; based on this, total of 5 postures was selected, and length changes of body surface were applied. The patterns in this study were designed with stretch material to help antagonism by muscle movements. Each fabric that was used in this study had 110% of stretch, 120~140% of stretch, and 150~170% of stretch. Both of one-way-fabric and duplex-fabric were used in this study, depending on application site.

• Bulletin of the Korean Chemical Society
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• 제15권3호
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• pp.228-236
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• 1994

The effect of the vibration mode coupling induced by the vibration-rotation interaction on total energy was investigated for the states with zero total angular momentum(J=0) in a quasilinear symmetric triatomic molecule of $AB_2$ type using a model potential function with a slight potential barrier to linearity. It is found that the coupling energy becomes larger for the levels of bend and asymmetric stretch modes and smaller for symmetric stretch mode as the excitation of the vibrational modes occurs. The results for the real molecule of $CH_2^+$, which is quasilinear, generally agree with the results for the model potential function in that common mode selective dependence of coupling energy is exhibited in both cases. The differences between the results for the model and real potential function in H-C-H system are analyzed and explained in terms of heavy mixing of the symmetric stretch and bend mode in excited vibrational states of the real molecule of $CH_2^+$. It is shown that the vibrational mode coupling in the potential energy function is primarily responsible for the broken nodal structure and chaotic behavior in highly excited levels of $CH_2^+$ for J= 0.