3차원 프린팅을 이용한 어린이용 무릎보호대의 분절형 하드쉘 설계

이효정,이예진,Lee, Hyojeong,Lee, Yejin 한국패션비즈니스학회 2017 패션 비즈니스 Vol.21 No.4

This study applied a segmented hard shell design on knee protectors for children with the objective of increasing mobility. The prototype of the hard shell that does not correspond to movement of the body among components of the knee protector was developed. Surface modeling was conducted based on 3D knee data to enhance comfort through optimized fit on the knee joint where the hard shell would be worn. For this, previous studies on changes in skin near the knee joint during knee flexion were reviewed to establish basic segmental lines. The basic design included six segments, and the number of segments was used as the design variable by increasing or decreasing it to 0, 3, 6, 9, and 14 segments. A prototype was produced from 3D printing with TPU material, worn for wearing assessment. Results revealed fewer numbers of segments resulting in less fit with the body, while actual appearance was stable. Meanwhile, the number of proper segments improved better fit with the body during movement. The wearing assessment revealed the amount of gap reflects change in skin length depending on movement. Assessment results demonstrated basic segment design, S6 with 6 segments, had the best design and most optimized fit. Findings in this study can provide key data for designing knee protection products for children.

동작가동성이 향상된 작업복 하의 개발을 위한 시판 제품의 착용감 및 여유량 평가

이효정,엄란이,이예진,Lee, Hyojeong,Eom, Ran-i,Lee, Yejin 한국의류학회 2017 한국의류학회지 Vol.41 No.4

This study provides a size specification and ease for the development of pants for working clothes in the construction industry according to season. We collected and measured the size specification of 4 types of Spring/Fall pants, 4 types of winter brushed bonding pants, and 4 types of winter padded pants. Subjective comfort evaluation and analysis of ease sensation were performed for all products on 12 subjects. The average size specifications for the pants according to seasons were as follows. Spring/Fall pants had 74.0/80.0cm waist size (relaxed/maximum stretched) and 104.0cm hip size. Winter brushed bonding pants had 76.0/83.4cm for waist size and 106.0cm for hip size. Winter padded pants had 71.5/84.0cm for waist size and 112.8cm for hip size. When designing a pattern by comparing product size specification and subject body size, the recommended ease is 0.2/7.2cm for waist size (relaxed, maximum stretched) and 13.6cm for hip size for Spring/Fall pants, and 0.2/6.2cm for waist size and 11.6cm for hip size of winter brushed bonding pants, and -5.3/7.2cm for waist size and 19.4cm for the hip size of winter padded pants.

시판 3D Spacer Fabrics의 기능성 의복에의 적용 가능성 확인을 위한 물성평가

이효정,엄란이,이예진,Lee, Hyojeong,Eom, Ran-i,Lee, Yejin 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.4

In this study, the physical properties of commercially available 3D spacer fabrics are analyzed, and their applicability to functional apparel is investigated. Six samples were prepared by purchasing four types of 3D spacer fabric with different thicknesses and surface structures (A1, B1, C1, and D1). Moreover, A2 and B2 are produced by two layers of A1 and B1, respectively, and their applicability to functional apparel was examined through the evaluation of the tensile strength, elongation, air permeability, Q-max, and thermal insulation. In addition, based on these, 3D spacer fabric modeling for 3D printing was attempted. It was observed that the tensile strength was higher in the wale direction than in the course direction, and it increased with increasing thickness. The elongation was the highest in C1, with large surface holes and low density. The air permeability was also the highest in C1, with large holes and relatively high thickness. It was observed that the air permeability of A1 and B1 significantly decreased when they were two layered fabrics. With regard to the Q-max, C1 and D1, which were thick samples, exhibited high warm feeling, while A1 and B1, which were thin samples, exhibited high cold touch. Finally, the thermal insulation was the highest in D1, which was the thickest sample, demonstrating a positive correlation with thickness and volume. As a result, considering the advantageous properties of each sample and the related specific performance required for functional apparel obtained from the above results, it was confirmed that the 3D spacer fabric could be applied to functional apparel.

컴프레션 웨어용 경편성 스트레치 소재의 반복세탁이 치수, 의복압 및 신장 특성에 미치는 영향

이효정,이예진,Lee, Hyojeong,Lee, Yejin 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.5

This research was conducted to analyze changes in physical properties of stretch material for compression ware after repeated laundry and to provide implications regarding management of compression wear. Five types of warp knit most frequently used in market were collected. Basic physical properties of the materials were analyzed. Each material had its % stretch (stretchability) measured. Based on the information, cylinder type were produced by applying 56% and 76% pattern reduction rate as a test specimen. Laundry was repeated for 10, 20 and 30 times. Afterward, area and clothing pressure of the test specimens were measured. Also, rate of measurement change after laundry and changes in stretching properties before and after 30 times of laundry was measured. The result confirmed that the areas of test specimens tend to change not proportionate to rate of measurement change after laundry. Clothing pressure remained without noticeable changes after 10 or 20 times of laundry. But 30 times of laundry decreased clothing pressure of every material by 0.1-0.3 kPa and deteriorated stretch characteristics. It implied that functions of compression ware could be lost or changed by repeated laundry over certain times.

국내 철강의 물발자국 및 철 교역을 통한 가상수의 이동 효율성 분석

이효정 ( Hyojeong Lee ),이건범 ( Geonbeom Lee ),최민서 ( Minseo Choi ),김다미 ( Dami Kim ),김은영 ( Eunyoung Kim ),박제량 ( Jeryang Parkf ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-

전 세계적으로 기후변화에 의한 물 부족 문제가 증가하면서 수자원을 효과적으로 이용하기 위한 한 방안으로써 물발자국(Water footprint) 개념이 도입되었으며 이를 이용한 가상수의 흐름을 분석하는 연구가 주목을 받고 있다. 현재까지는 농산품의 물발자국 및 가상수 이동에 대한 많은 연구가 있었으나, 상대적으로 공산품에 대한 연구는 미비하다. 철강은 매년 전 세계적으로 수백만 톤 단위로 생산되는 주요 건설 자재 중 하나이다. 한국의 경우 1973년 포항제철이 가동을 시작하면서 조강생산량 100만 톤을 돌파한 이래 세계적인 철강 생산국 및 수입·수출국의 위치를 지키고 있다. 철강 생산에는 많은 양의 가상수가 사용되며, 이는 다른 국가들과의 무역을 통해 적지 않은 가상수가 수입 및 수출되고 있음을 의미한다. 본 연구에서는 (1) 한국을 중심으로 가상수의 이동 효율을 평가하기 위해 국내의 철강 생산 공정을 토대로 물발자국을 계산하였다. 계산된 물발자국 값은 그 유효성을 확인하기 위해서 기존 연구 결과와의 비교 평가를 하였다. (2) 계산된 물발자국을 기반으로 한국에서 수출 및 수입되는 철강의 가상수 양을 평가하고, 이를 가상수 흐름의 네트워크로 시각화하였다. (3) 국가별 물부족 지수를 이용하여 현재 한국과의 철강 무역을 하고 있는 주요 국가와의 가상수 이동의 효율성을 평가하였다. 수자원의 측면에서는 가상수의 이동이 물이 풍부한 국가에서 부족한 국가로 이뤄질 경우 효율적이라고 볼 수 있다. 반면, 물이 부족한 국가로부터 풍족한 국가로 가상수가 이동할 경우 물의 비효율적 이용으로 평가할 수 있다. 본 연구 결과, 현재의 철강 무역은 가상수의 흐름을 전혀 고려하지 않기 때문에 주로 물이 부족한 국가에서 물이 풍족한 국가로 가상수가 이동하는 비효율적인 흐름을 보이는 것으로 나타났다. 이러한 가상수 흐름 분석은 수자원의 비효율적 이동을 판별하기 위해 이용할 수 있으며, 향후 공산품의 생산, 가공, 무역을 위한 의사 결정 시 물 이용 효율성 및 수자원 지속가능성을 감안할 수 있는 의사 결정 도구로 이용될 수 있다.

동작가동성이 향상된 건설업 근로자 작업복 상의 개발을 위한 시제품의 착용감 및 여유량 평가

이효정(Lee, Hyojeong),엄란이(Eom, Ran-i),이예진(Lee, Yejin) 한국생활과학회 2017 한국생활과학회지 Vol.26 No.4

This study aimed to quantitatively determine an appropriate size-margin for activities based on the analysis of existing products to improve the mobility of jumpers among the items worn by construction workers. In this study, four types of currently available spring/autumn jumpers and winter jumpers worn by construction workers were collected, and their size specifications were examined. After wearing the jumpers, the subjects evaluated the jumpers’fit and margin for movement. The average chest circumference of the collected spring/autumn jumpers was 113.4 cm, and that of the winter jumpers was 116.2 cm. The winter jumpers had ribs around the sleeves and hems. Both types of jumpers showed significant differences in the “comfort level” with motion for the sleeves and cuffs in the subjective fit evaluation; furthermore, the winter jumpers also had significant differences in the hem circumference. We found that in the design of construction work jumpers, the pattern and dimension of the sleeves affecting arm movement we revery important specifications, regardless of the season. Furthermore, the circumference of the hem, which can be pulled up by the movement of the arms and waist, is a sensitive part of the fit evaluation. It was confirmed that the dimension specifications for the ease of workwear should be changed according to the season, and the ease for work derived from this study were as follows: 20.0 cm for the chest circumference, 26.0 cm for the hem circumference, 15.8 cm for the sleeve circumference, and 5.6 cm for the cuff circumference, for the spring/autumn jumpers, and 19.5 cm for the chest circumference, 4.0 cm (28.0 cm for maximum height)forthe hem circumference with ribs, 13.8 cm for the sleeve circumference, and -0.4 cm(15.6 cm for maximum height) for the cuff circumference with ribs, for the winter jumpers.

의료 이미지 모달 변환을 위한 고주파 가종 필터링 기법의 효과 분석

이효정(Hyojeong Lee),조영완(Youngwan Jo),박상현(Sanghyun Park) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.12

뇌졸중환자의 과제지향몸통훈련이 몸통 근활성도에 미치는 효과

이효정(Hyojeong Lee),우성희(Sungheeg Woo),오규빈(Gkubin Oh) 한국정보통신학회 2020 한국정보통신학회 종합학술대회 논문집 Vol.24 No.1

전도성사의 심 퍼커와 봉합강도 평가

이효정 ( Hyojeong Lee ),박선희 ( Sunhee Park ),이예진 ( Yejin Lee ) 한국의류학회 2021 한국의류학회지 Vol.45 No.1

Seam puckering and the seam strength of conductive threads used to produce smart clothing were analyzed according to stitching methods and fabrics. Samples were prepared in a lock stitch and zigzag stitch on plain woven and jersey knit fabric, using one type of polyester sewing thread and three types of commercial conductive threads that consisted of two types of stainless-steel conductive threads (TST and MST) and one type of silver conductive thread (SSV). Seam pucker percentages, shapes, and seam strength were measured. On plain woven fabric as well as jersey knit fabric, three-ply TST and MST showed a higher SP percentage compared to a polyester sewing thread. Meanwhile, single-ply SSV showed the lowest SP percentage. In addition, the SP percentage of the zigzag stitch decreased along the weft and course directions of the fabric, and decreased significantly as the number of fabric layers increased. Moreover, there was a marked tendency for a higher SP percentage in jersey knit fabric compared to plain woven fabric, and the two-dimensional cross-section waveforms of stitches obtained using three-dimensional data that showed increased irregular waveforms and peaks in the zigzag stitch. There were no correlations between seam strength and tensile strength.

보행환경변화에 따른 이중과제훈련이 뇌졸중환자의 기능에 미치는 효과

이효정(HyoJeong Lee),우성희(Sunghee Woo),김수진(SooJin Kim) 한국정보통신학회 2020 한국정보통신학회 종합학술대회 논문집 Vol.24 No.2

임상에서 주로 사용하는 이중과제를 통해 기능에 미치는 효과를 확인하고자 장애물보행과 인지과제 훈련과 평지보행과 인지과제 훈련 후 변화를 보기 위해 기능을 평가하였다. 기능 중 자기관리, 이동과 보행에서 장애물보행훈련을 한 실험군1이 유의미한 차이를 보였고 실험군1과 2는 자기관리와 보행에서 두 군간에 유의미한 차이를 보였다. Objectives :This study aimed to determine whether dual-task training can improve function in stroke patients. Methods : Cognitive task with obstacle walking training and Flatland walking training was accordingly applied in each group for 60 minutes per session, 3 times per week for 6 weeks. Function were assessed using a Functional Independence Measure, respectively, before and after training. Results : Functional Independence Measure in the self care, transfer and locomotion significantly increased in experimental 1 groups after training (p<.05), and self care and locomotion there were a significant difference between the groups.