• 대한가정학회지
• /
• 제25권1호
• /
• pp.11-18
• /
• 1987

The purpose of this study was to investigate the crease recovery and the elastic recovery as a function of the direction of plain woven fabrics. The crease recovery was measured by Mosanto's Method and the elastic recovery was investigated by Autograph for ten kinds of plain woven fabric samples. The results were as follows; 1. Values of crease recovery were in the order of bias>weft>warp. 2. The lengthening of recovery time had a little effect on crease recovery. 3. The directions of crease recovery were affected by that of thread twist. 4. The linearity was shown between total crease recovery and warp-weft crease recovery. 5. The linearity was found between crease recovery and elastic recovery in the fabrics.

• 한국항공우주학회지
• /
• 제35권10호
• /
• pp.905-911
• /
• 2007

이 논문에서는 기하학적 및 재료적 비선형 유한요소해석을 통하여 멤브레인의 접힘 거동을 연구하였다. 얇은 멤브레인의 단면에 대해 평면변형률을 가정하여 2차원 요소로 모델링 하였다. 접힘 과정은 먼저 멤브레인 메쉬를 접은 후, 두 개의 강체 접촉면을 사용하여 지정된 접힘 간극까지 압축한 다음, 강체 접촉면을 풀어 접힘 형상을 얻는 순서로 모사하였다. 다양한 접힘 간극에 대해 해석을 수행하여 접힘 강도가 초기 전개각에 미치는 영향을 중심으로 결과를 고찰하였다. 또한 실제 시편에 대하여 실험을 수행하여 그 결과를 해석결과와 비교하였다.

• 전자공학회논문지 IE
• /
• 제44권2호
• /
• pp.32-40
• /
• 2007

본 논문에서는 지문 영상 내부에서 특징 정보 추출의 정확성을 향상시킬 수 있는 주름선 검출 방법을 제안한다. 먼저 각 방향별 슬릿의 평균 픽셀 값과 분산에 의하여 픽셀이 주름선 후보 영역에 해당하는지를 결정하고, 그 위치에 해당하는 주름선 방향을 검출한다. 그리고 후보 영역에 해당하는 픽셀의 주름선 방향에 의하여 8개의 영상으로 분해한다. 각 방향별 분해 영상에서 주름선 후보 영역 픽셀들이 형성하는 클러스터의 길이, 주름선 방향과 픽셀 분포 방향의 일치성, 융선 방향과 픽셀 분포방향의 차, 후보 픽셀들의 평균 픽셀 값을 이용하여 주름선 클러스터를 검출한다. 마지막으로, 각 방향별 분해 영상의 주름선 클러스터들을 합성함으로써 주름선 영역을 검출한다. 제안한 방법을 구현하고 주름선 검출을 수행한 결과, 91.4%의 높은 정확성을 확인하였다.

• 전자공학회논문지CI
• /
• 제44권3호
• /
• pp.90-97
• /
• 2007

지문인식 시스템이 높은 신뢰도를 가지기 위해서는, 정확한 특징 정보 검출이 이루어져야 한다. 본 논문에서는 지문 영상내부에서 특징 정보 추출의 정확성을 향상시킬 수 있는 효율적인 주름선 검출 방법을 제안한다. 제안한 방법은 각 화소에 대하여 1차원 방향성 slit을 적용한 다음 slit에 해당하는 화소의 평균 밝기 값과 분산을 이용하여, 화소가 주름선 후보 영역인지를 결정하고 그 위치에 해당하는 주름선 방향을 검출한다. 그리고 후보 영역에 해당하는 화소의 주름선 방향에 의하여 8개의 영상으로 분해한 다음, 각 방향별 분해 영상에서 주름선 영역의 성질을 이용하여 주름선 클러스터를 검출한다. 마지막으로 각 방향별 분해 영상의 주름선 클러스터들을 합성함으로써 주름선 영역을 검출한다. 제안한 방법을 구현하고 실험한 결과 주름선 검출에서 높은 정확성을 나타내었다.

• 한국생활과학회지
• /
• 제9권4호
• /
• pp.483-489
• /
• 2000

The purpose of this study is to verify the effect of cellulase treatment on crease resistance of cotton. Cotton fabrics was treated with cellulase under different concentration at $50^{\circ}C$ for 40 min. Also to compare the effect of DMDHEU treatment, DMDHEU treatment was conducted before and after cellulase treatment, also with cellulase. Weight loss, crease resistance and tentile strength of each samples were measured and compared. Maximum weight loss showed at 1g/l con. with 40 min. treatment. Cellulase enzyme treatment was more effective than DMDHEU in the crease resistance and tensile strength. Crease resistant of cotton which treated under different condition with cellulase and DMDHEU showed in the order of cellulase+DMDHEU> cellulase> DMDHEU treatment. Also, tensile strength showed in the order of cellulase> cellulase+DMDHEU> DMDHEU. Among those treatment conditions, condition which treated with cellulase considered more effective to increase crease resistance while keeping tensile strength too.

• 한국의류학회지
• /
• 제13권3호
• /
• pp.259-267
• /
• 1989

In this paper, the fabric specimen undergoes repeated laundering under given condition. After this cyclic laundering was applied, the crease recoveries of the specimen were measured using shirley crease revovery tester in order to evaluate the effect of factors at given condition during crease deformation. 5 samples of grey plain cloth were desized, alkali-scoured, bleached, whased with water, and air-dried. All tests were made on samples preconditioned to $65\%\;RH\;and\;20^{\circ}C$. The experimental results were analysed statistically to relate crease recoveries and the properties of smaples, recovery periods (time) of crease. Furthermore, the crease recoveries of core-spun yarn woven fabrics were discussed in comparison with those values for $100\%$ combed cotton yarn woven fabric and $65\%$ polyester $35\%$ carded cotton blended yarn woven fabric. The results obtained are as follows; 1. Regardless of materials, remarkable decrease are observed in crease recoveries about 1-5 cycles of the repeated laundering, but slack decrease are observed in crease recoveries after 5 cycle of the re-peated laundering. 2. Crease recoveries ($\alpha$) of core-spun yarn woven fabrics are relate to recovery periods (t) of crease as follows; log$\alpha$=0.01415 log t+2.1168 ($r^2=0.94$) 3. Core-spun yarn woven fabrics were superior to $100\%$ combed cotton yarn woven fabrics and $65\%$ polyester $35\%$ carded cotton blended yarn woven fabric in crease recoveries. 4. Crease recoveries ($\alpha$) of core-spun yarn woven fabrics are relate to cover factor (CF), thickness (T) at pressure 0.5 $gf/cm^2$, weight (W) as follows; log$\alpha$=-0.3482 log CF-0.4924 log T-0.4727 W+2.4243 ($r^2=0.88$) 5. Crease recoveries ($\alpha$) of core-spun yarn woven fabrics are relate to 2HB/B, 2HB/W, $\sqrt[3]{B/W}$, WC/T which are concerning to formation of weared clothes and bending Iran formation behavior as follows: log $\alpha$=0.0091 2HB/B+0.4667 2HB/W+0.0185 $\sqrt[3]{B/W}$+0.0114 WC/T+1.8433 ($r^2=0.86$)

• 한국산업정보학회논문지
• /
• 제14권4호
• /
• pp.57-64
• /
• 2009

본 논문에서는 지문 영상 내부에서 특징 정보 추출의 정확성을 향상시킬 수 있도록 영상 전처리 과정에 방향성 중간 값 필터를 적용한 주름선 검출 방법을 제안한다. 제안한 방법은 먼저 픽셀이 주름선 후보 영역에 해당하는지를 결정하여 그 위치에 해당하는 주름선 방향을 검출한다. 그리고 주름선 검출의 성능 향상을 위해 후보 영역에 대한 방향성 중간값 필터를 적용하여 지문 영상을 향상시킨 다음, 후보 화소로 구성된 영상에서 후보 화소가 가지는 주름선 방향을 이용하여 영상의 분해 및 합성을 통해 주름선 영역을 검출한다.

• 대한두개안면성형외과학회지
• /
• 제22권6호
• /
• pp.310-318
• /
• 2021

Background: Transcutaneous lower eyelid approaches are associated with a risk of postoperative scarring depending on the distance between the incision line and the lower eyelid margin. The lower eyelid crease of Caucasians corresponds to a ridge-shaped fold in young Asians. However, this relationship has not been sufficiently evaluated in the latter. The authors, therefore, investigated the location of the scar and the lower eyelid crease or ridge to find the optimal location for the incision line. Methods: This study included 60 out of 139 patients who underwent inferior orbital wall reconstruction through a lower eyelid skin incision between July 2019 and June 2020. According to the location of the scar, the patients were classified into three groups: group A (≥ 2 mm above the lower eyelid crease or ridge), group B (within the lower eyelid crease or ridge to 2 mm above the lower eyelid crease or ridge), and group C (within the lower eyelid crease or ridge to 2 mm below the lower eyelid crease or ridge). At 6 or 12 months after surgery, the Patient and Observer Scar Assessment Scale (POSAS) score was obtained, the distance between the lower eyelid margin and the scar (DMS) and the distance between the margins of the peripheral pupil and the lower eyelid (DMPE) were measured, and the occurrence of ectropion was evaluated. Results: Group B had the lowest POSAS score (A: 22.7 ± 8.0, B: 20.9 ± 2.4, C: 32.5 ± 4.1, p< 0.001). Linear regression analysis showed that the DMS was positively correlated with the POSAS score (p< 0.001) and that the risk of DMPE widening increased as the DMS decreased (p= 0.029). None of the patients had ectropion. Conclusion: When using the transcutaneous approach for inferior orbital wall reconstruction, the optimal incision site is within the lower eyelid crease or ridge to 2 mm above the lower eyelid crease or ridge.

• 한국의류산업학회지
• /
• 제6권2호
• /
• pp.229-233
• /
• 2004

Andongpo, 100% Korean hemp fabric was treated with the glyoxale resin type finishing agent and/or the soluble urethane type finishing agent to determine the optimum process condition of the crease resistant finish and the crease recovery of treated sample fabrics was evaluated for the study. The treatment conditions for the study were 6 conditions, such as, A-1~A-6, in which A-1 was the condition of treatment glyoxale resin type finishing agent only and A-2~A-6 were the condition of treatment both glyoxale resin type finishing agent and soluble urethane type finishing agent. Among the 6 conditions, the crease recovery of the sample treated with A-4 condition was $148^{\circ}$(angle of recovery method) and grade 3.2(appearance method) and so, these samples showed the excellent crease recovery. From the result, 15g/l of the catalyst conc., 50g/l of the glyoxale resin type finishing agent cone., and 40g/l of the softner were the optimum treatment condition for the crease resistant finish of the andongpo.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2000년도 추계종합학술대회 논문집(4)
• /
• pp.247-250
• /
• 2000

This paper proposes a finger crease pattern identification algorithm utilizing a clustering method. The algorithms has been developed for the use of biometric person identification system. Since the finger crease pattern may be well-imaged utilizing low cost imaging devices such as low-end CCD camera with LED lighting, the feasibility of commercialization of the algorithm and the system utilizing the algorithm may be well justified if the finger crease pattern is a reasonable choice for the biometric feature. In this paper, we exploit this possibility and show the potential of using the finger crease pattern as a feature for biometric person identification.