• 한국산학기술학회논문지
• /
• 제11권10호
• /
• pp.3923-3927
• /
• 2010

대전롤러는 감광체의 표면과 접촉된 상태로 회전하면서 드럼 표면을 대전시켜야 하므로 접촉이 잘 되도록 적당한 도전성을 갖는 탄성체로 만들어 진다. 또한 그 롤러 표면은 코팅을 하게 되는데 코팅제의 종류나 코팅 방식에 따라서 대전특성이나 화상특성이 달라지고, 또한 환경의 변화에 따라 화상특성이 달라진다. 본 연구에서는 고품질의 화상형성을 얻을 수 있는 대전 롤러의 제조를 위하여 적합한 도전성 탄성체 롤러를 개발하였다.

• The Journal of the Acoustical Society of Korea
• /
• 제27권3E호
• /
• pp.84-94
• /
• 2008

Displacement estimation is a crucial step in ultrasonic strain imaging. The displacement between a pre- and postcompression signal in the current data window is estimated by first shifting the postcompression signal by the displacement obtained in the previous data window to reduce their decorrelation and then determining the remaining part of the displacement through autocorrelation and conversion of phase difference into time delay. However, since strain image quality tends to vary with the amount of compression applied, we propose two new methods for enhancing strain image quality, i.e., displacement normalization and adaptive persistence. Both in vitro and in vivo experiments are carried out to acquire ultrasound data and produce strain images in real time under the application of quasi static compression. The experimental results demonstrate that the methods are quite effective in improving strain image quality and thus can be applied to implementing an ultrasound elasticity imaging system that operates in real time.

• 한국산학기술학회논문지
• /
• 제10권2호
• /
• pp.243-247
• /
• 2009

일차 충전 롤러는 OPC 드럼의 접촉 표면를 회전하면서 OPC드럼을 충전한다. 이러한 이유로, 일차 충전 롤러는 전도성을 갖는 탄성물질로 만들어진다. 충전 및 이미지의 특성은 코팅의 등급, 방법 및 환경에 의해 변한다. 본 연구에서는 좋은 품질의 이미지를 프린트할 수 있는 코팅 물질 및 방법을 개발 하였다.

• 한국산학기술학회논문지
• /
• 제9권2호
• /
• pp.347-351
• /
• 2008

PCR은 OPC 드럼의 표면과 접촉된 상태로 회전하면서 드럼의 표면을 대전시켜야 하므로 접촉이 잘 되도록 적당한 도전성을 갖는 탄성체로 만들어야 하고, 또한 그 롤러 표면은 코팅을 하게 되는데 코팅제의 종류나 코팅 방식에 따라서 대전특성이나 화상특성이 달라지고, 또한 환경의 변화에 따라 화상특성이 달라진다. 본 연구에서는 양질의 프린트 화상을 얻을 수 있는 대전 롤러의 제조를 위하여 적합한 도전성 탄성체 롤러가 새롭게 개발되었다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2006년도 춘계학술대회논문집
• /
• pp.1391-1395
• /
• 2006

In non-contact mode atomic force microscopy, the response of a resonating tip is used to measure the nanoscale topography and other properties of a sample surface. However, the tip-surface interactions can affect the tip response and destabilize the non-contact mode control. Especially it is difficult to obtain a good scanned image of high adhesion surfaces such as polymers using conventional hard NCHR tip and non-contact mode control. In this study, experimental investigation is made on the non-contact mode imaging and we report the microcantilever having low stiffness (OMCL) is useful to measure the properties of samples such as elasticity. In addition, we proved that it was adequate to use low stiffness microcantilever to obtain a good scanned image in AFM for the soft and high adhesion sample.

• 한국음향학회지
• /
• 제29권8호
• /
• pp.504-508
• /
• 2010

기존의 초음파 의료용 탄성영상에서 변형률 영상을 모니터에 표시할 때 인간 시각 특성을 반영하여 단단한 부위는 어둡게 표시하고 무를수록 밝게 나타낸다. 따라서 종양이나 암이 존재하는 단단한 부위는 어둡게 나타나서 병변 내부의 콘트라스트는 저하되어 나타난다. 병변 영역은 단단하여 변형률 영상에서 어둡게 나타나므로 병변 내부를 좀 더 자세히 진단하는 방법으로, 누른 후의 신호를 누른 변형률만큼 다시 신장시켜서 얻는 전역 균일 신장 방법을 적용하여 영상의 명암을 반전시킴으로써 병변 부분의 콘트라스트를 올리는 방법을 제안하였다. 의료용 초음파 영상 진단기를 이용하여 탄성 모사 팬텀에서 초음파 데이터를 얻어서 제안한 알고리즘을 검증하여 유용성을 확인하였다. 전역 균일 신장 없이 회색조 컬러 맵을 반전해서 얻은 변형률 영상법에 비해 콘트라스트 대 잡음비가 최대 1.8배 정도 향상되었다.

• 대한화장품학회지
• /
• 제27권1호
• /
• pp.83-98
• /
• 2001

Inositol, is a water-soluble crystalline compound. It helps with people’s metabolism and decreases cholesterol levels. It is also known to have anti-cancer results. In order to find out the affects of Inositol on the skin, Inositol skin lotion was produced with each amount of Inisitol: 0, 0.5, 1.0, 2.0, 3.0 wt% and tested on the faces and the arm areas of women in all ages for 7 weeks. The moisture, sebum, change in elasticity, and improvement of wrinkles were measured. Corneometer, Sebumeter, Cutometer, and an image analyzer were used as measuring equipments. There are subtle differences in the subjects when 1-2% of Inositol is used the moisture of the skin improved 19%, elasticity by 17%, and the amount of sebum for dry and oily skin types adjusted to the amount of sebum of the neutral skin types. This influenced the length, width, the number of peak, and the height of the wrinkles to improve 12.4%. It is thought that Inositol would be an effective new raw material in cosmetics.

• 대한화장품학회지
• /
• 제21권1호
• /
• pp.1-18
• /
• 1995

Amino propane sulfonic acid가 피부에 미치는 영향을 non-invasive technique으로 사람의 피부를 이용하여 비교 분석하여 보았다. 측정변수로는 보습, 탄력, 피부색, 피부주름 등 4가지 측면에서 실험을 수행하였다. In vitro culture에서는 fibroblast의 증식은 촉진하였으나 keratinocyte의 중식에는 영향을 주지 못하였다. 또한 raft culture법을 이용해 APSA를 처리하였을 때도 keratinocyte에서 유사한 결과를 얻을 수 있었으므로 in vitro 상에서 표피보다는 진피 부분에서 영향을 주는 것으로 보인다. 임상시험 결과, 피부 보습에는 영향을 주지 않았으며 피부색, 탄력, 잔주름 등이 개선된 효과를 얻을 수 있었다. 특히 New Opticoprofilometry 법인 Visiometer법을 이용하였을 때 피부 주름 변화에 대해 더 유의한 결과를 얻을 수 있었다.

• Korean Journal of Radiology
• /
• 제23권3호
• /
• pp.308-321
• /
• 2022

Transabdominal ultrasound (TAUS) is useful in all aspects of lesion screening, monitoring activity, or treating/diagnosing any related complications of inflammatory bowel disease. Its ability to screen or diagnose complications is almost the same as that of other methods, such as CT or MRI. Moreover, its noninvasiveness makes it a first-line examination method. A TAUS image depicting ulcerative colitis will show large intestinal wall thickening that is continuous from the rectum, which is mainly due to mucosal layer thickening, while for Crohn's disease, a TAUS image is characterized by a diversity in the areas affected, distribution, and layer structure. Indicators of activity monitoring include wall thickness, wall structure, and vascular tests that use Doppler ultrasound or contrast agents. While all of these have been reported to be useful, at this time, no single parameter has been established as superior to others; therefore, a comprehensive evaluation of these parameters is justified. In addition, evaluating the elasticity of lesions using elastography is particularly useful for distinguishing between fibrous and inflammatory stenoses. However, the lack of objectivity is the biggest drawback of using ultrasound. Standardizing and popularizing the ultrasound process will be necessary, including scanning methods, equipment settings, and image analysis.

• 한국의류학회지
• /
• 제27권11호
• /
• pp.1318-1329
• /
• 2003

The purpose of this study was to examine the effects of the structural characteristics of men's suit fabrics on the texture image and the preference, and to analyze the relationship between the preference and the practical sales ratio. In addition, the texture images and the preference of fabric and jackets made of the same fabrics were compared. As specimen, jackets for men's suit of 2002' S/S and their fabrics were collected. Questionnaires composed of 22 sensibility related and 21 fabric image related adjectives were developed. For the subjective evaluation of the texture image, both jackets and fabric samples were tested. Tests were performed with 100 female subjects in clothing department and apparel industry. For the objective evaluation, structural characteristics such as fiber contents, yarn twist, fabric count, thickness and weight were analyzed. Total Hand Value were calculated from mechanical properties determined by the KES-FB system. Factor analysis showed sensibilities were classified into 6 categories; "surface roughness", "weight", "density", "stiffness", "elasticity" and "wetness". Fabric images were classified into 4 categories; "classic", "original", "practical", and "stuffy". Depending on the method to show the specimen to the subjects, whether it is suit or fabric, statistically significant differences were observed with a number of adjectives for sensibilities and fabric images. The results of THV of KES did not agree with the preference of subjects, which suggests that we should be careful when using the KES system, which was developed for Japanese people. Price was considered to be another factor besides the texture image that influenced on purchase.