• 대한기계학회논문집B
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• 제38권2호
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• pp.173-181
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• 2014

정상초음파장의 주파수 변이가 프로판/공기 예혼합화염의 전파거동 및 구조변이에 미치는 영향을 규명하기 위해 실험적 연구를 수행하였다. 다양한 당량비 조건에서 슐리렌 기법을 적용한 전파화염 가시화와 연소실 내부압력 측정을 통해 생성물 영역에서의 화염 구조변화 및 전파특성을 관찰하였다. 정상초음파가 존재할 경우 화염선단이 찌그러지고 기연부에서 횡방향 줄무늬가 생성되며, 이러한 구조변이는 정상초음파의 주파수에 종속한다. 또, 전파속도는 정상초음파가 교반하는 경우 증가되며, 화염전파 거동에 미치는 초음파의 영향은 주파수의 증가에 따라 보다 명확해진다는 사실도 확인되었다.

• 대한물리의학회지
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• 제5권3호
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• pp.363-373
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• 2010

Purpose : The purpose of this study was to compare differences in thoracolumbar ranges of motions by comparing ratios among 4 type diagnosis for patient with chronic low back pain. Methods : The subjects were 58 chronic low back pain patients. A motion analysis program (Global Postural System) was used after photography for posture measurement. To analyze differences in mobility percentages and ratios of thoracolumbar ranges of motion, one-way ANOVA was used. Results : Regional difference spinal posture and movement were found to diagnosis patients with chronic low back pain. Comparison of thoracolumbar ranges of motion revealed significant differences in the thoracic region during forward-bending of the trunk (p<.05). In the upper thoracic region, the herniated intervertebral lumbar disc (HILD) group was significantly larger than the spinal stenosis/herniated intervertebral lumbar disc (SS/HILD) group (p<.05). In the lower thoracic region, chronic sprains (CS) were significantly greater than in the spinal stenosis (SS) group and in the (SS/HJLD) group (p<.05). Comparative analysis of thoracic/lumbar mobility ratio showed the CS group's ratio during forward bending was largest: 1.66, while the HILD group's ratio was smallest: 84 a significant difference between the two groups (p<.01). Diagnosis was not associated with difference in thoracolumbar backward-bending range of motion (p>.05). Conclusion : Theses results indicate the clinical efficacy of diagnosing for chronic low back pain by evaluating spinal mobility.

• 대한물리의학회지
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• 제14권4호
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• pp.173-181
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• 2019

PURPOSE: This study examined the necessity of a musculoskeletal injury-prevention program for automobile parts manufacturing workers by assessing the body composition, muscle strength, and posture according to sex and age. METHODS: Two hundred eighty-two workers (men, 218; women, 64; mean age, 38.97 years; and mean work tenure, 10.29 years) participated in this study. They completed a questionnaire on their general characteristics, excluding personal identification codes. The participants were evaluated for body composition, muscle strength, and posture using InBody, a hand dynamometer, and the Image J program through photography, respectively. An independent t-test and one-way analysis of the variance were used for the comparisons according to sex and age, respectively. RESULTS: Significant sex-related differences in muscle strength and grip force were observed (p<.05). In addition, the left-side pelvic inclination was significantly higher in the female participants than in the male participants (p<.05). Significant age-related differences in the skeletal muscle mass and muscle strength were observed around 40 years (p<.05). Significant correlations were observed among the body composition (skeletal muscle and body fat masses), muscle strength, and posture (pelvic inclination; p<.01). CONCLUSION: Significant differences in pelvic inclination by sex and muscle strength by age were found, even in healthy workers. Additional posture and muscle strength measurements will be needed for workers who participate in the musculoskeletal injury prevention program because they are exposed to an incorrect posture for many hours or in many repetitive tasks.

• 한국측량학회지
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• 제11권1호
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• pp.19-27
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• 1993

대규모 쓰레기 매립장의 신설계획을 추진하기 위해서는 기존 매립장의 이용상태에 대한 정확한 현황분석을 통해 이용계획이 선행되어야 하며, 이를 위해 현 매립장의 쓰레기 매립양과 도시 경관 및 제반조건에 부합되는 여부를 파악하기 위해 현 매립상태에 대한 정확한 분석이 수반되어야 한다. 본 연구에서는 항공사진촬영에 의해 구축된 수치표고모형을 이용하여 현 쓰레기 매립상태 및 매립양의 정확한 분석을 수행하기 위해 지형분류에 따른 최고 자료보관방법과 면·체적결정방법을 결정함으로써, 현재 쓰레기 매립장의 장래 이용계획에 정확한 기초자료를 제공하는데 목적이 있다. 본 연구의 수행결과 대상지역의 지형분류를 객관적으로 수행하기 위한 알고리즘을 정립하였으며, 표본자료에 대해 각 지형의 최적보관법과 면· 체적결정방법을 결정하였다. 또한 이와 같이 얻어진 결과를 난지도 쓰레기 매립장에 적용함으로써 매립현황 및 매립가능량을 분석할 수 있었다.

• 한국측량학회지
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• 제11권2호
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• pp.7-15
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• 1993

대상 지역의 자료기반을 구축하기 위해서는 필요한 목적에 따라 신속하고 정확한 지형정보를 얻어야 한다. 일반적으로 지형정보의 취득에 이용되는 방법에는 지도, 위성영상 및 항공사진의 입체모형을 이용하는 방법이 있으나 대상지역의 크기, 영상의 공간해상력, 소요정확도 및 경제성 등을 고려하여 최적방법을 선택하여야 한다. 따라서, 본 연구에서는 소규모 대상지역인 농촌 정주권사업 계획 지구를 선정하여 Photoballoon 시스템을 활용한 지형정보의 취득 및 기본도제작 방법과 지형공간정보체계의 공간 중첩기법을 활용함으로써 소규모 대상지역의 효율적인 지형자료기반 구축방법을 제시하는데 목적이 있다. 본 연구의 수행결과, 대상지역의 정밀한 입체사진을 얻기 위한 Photoballoon 시스템의 최적 촬영조건을 결정하고 이에 따른 정확도 분석을 통해 소규모지역에 대한 입체사진 및 지형도를 신속하고 경제적으로 얻을 수 있었으며, 이를 이용하여 대상지역에 필요한 각종 계획을 수행함으로써 소규모지역의 효율적인 계획 및 설계에 활용가능한 자료기반을 구축할 수 있었다.

• 한국인쇄학회지
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• 제31권1호
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• pp.51-64
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• 2013

When it comes to current growth trend for the printing process in Asia printing market, offset printing, gravure printing and screen printing are reduced respectively -4%, -19%, -55%. In judging from the fact, the change in the printing production system from mass production on small amount to small production on mass amount is the biggest issue. For this reason, digital printing shows the significant growth. According to the increase of the growth 78% for electro photography way and 67% for ink-jet, it's not enough to catch up with digital printing which is increasing as time goes by to equip with hardware like as digital press. There's been necessary to install the BOD(Book on Demand) system which is the advanced and regular publication edit solution based on web-to-print model in the prepress, and it has made the BOD system be considered in relation to maximization of efficiency and production. Therefore, this research tries to step forward from the POD concept, which is refired to "Print along with the ordered quantities, the ordered appropriate time and the demanded place", so that it could expand the range of the printing/publishing environment using the BOD system, the order-made publication based on automatically operating template. And it tried to make the relation to digital web press on ink-jet method which is adequate to "mass production on small amount" with such advanced concept. This research also aims to use actively BOD solution model to promote the productivity of labor, and then to produce the printings across all related industries, which means to manufacture maximally the products on the shortest time at minimum place through PC equipments.

• 한국생활과학회지
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• 제15권4호
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• pp.651-658
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• 2006

This study was performed to provide the analysis on their size and the structural factors required in the process of design and manufacture of school girls' shoes. 371 elementary school girls in Kyungin and Youngnam area were participated in the size measurement. 25 foot items and 6 main body items were measured directly or indirectly using a digital photography. The results of the study are as follows: first, by most of measured items, the range of their foot size was very wide from the size of toddlers to adults'. That shows that the change of school girls' foot size occurred with their growth is pretty big. Second, from the structural factor analysis on 25 foot items, five factors were extracted such as 'the size of the foot', 'the volume of the foot,' 'the height and inclination of the foot,' 'the shape of the foot,' and 'the inside and outside inclination of the foot'. Third, from the cluster analysis, three clusters were classified: Cluster 1 was the group of 10 to 11 year old girls who had big-sized feet. The elementary school girls in the fourth to sixth grade belonged to this group. Cluster 2 consisted of girls who had small-sized and big-volumed feet. Cluster 3 had medium-sized and slim-shaped feet. Most of 6 to 7 year old elementary school girls belonged to this group. The above-mentioned results imply that many continual researches are required on children's shoe production reflecting the change of elementary school girls' feet size owing to their growth. The quantitative data on elementary school girls' feet size in this study could be used as basic information for the development of children's shoe design and its production.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제39권1호
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• pp.21-26
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• 2013

Objectives: Full thickness skin grafts (FTSG) offer several advantages; they are esthetically superb, have less postoperative shrinkage, and offer minimal postoperative pain and scar formation at the donor site. As a donor site of FTSG, the groin offers a relatively large area of skin with high elasticity. The aim of this study was to evaluate FTSG from the groin for reconstruction in oral and maxillofacial surgery. Materials and Methods: In a retrospective study, 50 patients (27 males, 23 females) who received FTSG from the groin were evaluated for their operation records, clinical photography, and medical records. Results: The width of skin from the groin was distributed from 2-8 cm (mean: 5.1 cm) at the donor site, while the long axis length was distributed from 3-13 cm (mean: 7.4 cm). A high number of patients, 47 patients (94%) out of 50, showed good healing at the donor site. Wound impairment was seen in 3 patients (6%), minor wound dehiscence in 2 patients, and severe wound dehiscence in 1 patient. In the recipient site, delayed healing was observed in 2 patients (4%). Conclusion: FTSG from the groin to repair soft tissue defects in reconstruction surgery is a good method due to the relatively big size of the graft, decreasing morbidity at the donor site, and higher graft survival rates.

• 복식문화연구
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• 제16권1호
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• pp.1-21
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• 2008

The purpose of this study is to typify femininity and masculinity represented in mainstream women's and men's fashion magazines in Korea since 2000 and infer sexual ideology appearing in contemporary Korean society by content analysis with the view of plural sexuality. For the content analysis total 259 editorial fashion photography was analyzed. As the result, 5 femininities and 5 masculinities were typified, and then sexual discourse was inferred out of the frequency of each type and texts with the images. On the basis of previous studies and historical considerations of this topic, the types of sexuality represented in mainstream fashion magazines in Korea since 2000 were classified as follow.: in women's fashion magazines Traditional Femininity and Androgynous Femininity were almost similarily dominant sexuality, and Glamor Femininity, Babydoll Femininity, and Genderless sexuality were alternative. Meanwhile, in men's fashion magazines Traditional Masculinity formed clear dominant sexuality, and Macho Masculinity, Androgynous Masculinity, Adolescent Masculinity, and Genderless sexuality were alternatives. In addition, Androgynous Masculinity in women's fashion magazines occupied the highest frequency, while Glamor Femininity in men's fashion magazines did so. From this sexual discourses represented in mainstream fashion magazines in Korea since 2000 are as follow.: First, mainstream fashion in Korea sticks to the modern values preserving traditional sexual ideology even in this postmodern period of the former 21C. Second, Androgynous Femininity as another dominant femininity with Traditional Femininity connotes the change of conception of femininity in Korean society. Third, Androgynous Masculinity to females is preferred, while femininity to males is still regarded as fetish or adorned object. Fourth, the appearance of various alternative sexualities leads to pluralization of sexuality, and then fashion gradually codifies youthfulness and feminine values, such as body and sexual desire more than before.

• 대한구순구개열학회지
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• 제6권2호
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• pp.91-105
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• 2003

There are significant limitations in the precision of mandibular distraction in setting a desired occlusal and facial esthetic outcome. The purpose of this study is to present the simulation method for the distraction osteogenesis treatment planning. 3-D surgery simulation software programs V-works and V-Surgery(Cybermed, Seoul, Korea) were used from the 3D CT data in addition to the conventional data facial photography, panorama and cephalogram, dental cast model. We have utilized already for the various surgical procedures to get information preoperatively for the maxillofacial surgery like cancer localization and reconstructive surgery, orthognathic surgery and implant surgery in the department of Oral and Maxillofacial surgery, Seoul National University Hospital. On the software, bone cutting can be done at any place and any direction. Separated bone segment can be mobilized in all 3 dimensional direction. After the 3D simulation on the software program, mock surgery on the RP model can be performed. This planning method was applied to two hemifacial microsomia patients. With this protocol, we could simulate the movement of bony segment after maxillofacial distraction osteogenesis