• Composites Research
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• 제36권6호
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• pp.402-407
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• 2023

Activated carbon fibers (ACFs) are fibrous form of activated carbon (AC) with higher mechanical strength and flexibility, which make them suitable for building modules for applications including directional gas flow such as air and gas purification. Similarly, ACFs are anticipated to excel in the efficient capture of CO₂. However, due to the difficulties in fabricating monofilament carbon fibers at a laboratory scale, most of the studies regarding ACFs for CO₂ capture have relied on electrospun carbon fibers. In this study, we fabricated monofilament carbon fibers from PAN-based monofilament precursors by stabilization and carbonization. Then, ACFs were successfully prepared by chemical activation using KOH. Different weight ratios ranging from 1:1 to 1:4 were employed in the fabrication of ACFs, and the samples were designated as ACF-1 to ACF-4, respectively. As a function of KOH ratio, increase in surface area could be observed. However, the CO₂ adsorption trend did not follow the surface area trend, and the ACF-3 with second largest surface area exhibited the highest CO₂ adsorption capacity. To understand the phenomena, nitrogen content and ultramicropore distribution, which are important factors determining CO₂ adsorption capacity, were considered. As a result, while nitrogen content could not explain the phenomena, ultramicropore distribution could provide a reasoning that the excessive etching led ACF-4 to develop micropore structure with a broader distribution, resulting in high surface area yet deteriorated CO₂ adsorption.

• Journal of Gastric Cancer
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• 제3권2호
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• pp.93-96
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• 2003

Purpose: Synthetic absorbable monofilaments offer excellent glide characteristics and cause minimal tissue trauma as a result of their smooth monofilament structure and gradual absorption within the healing tissues. For these reasons, these suture materials are commonly used in various surgical fields such as gastroenterology, urology, gynecology, and plastic surgery. The aim of this study was to evaluate the safety and usefulness of a new synthetic absorbable monofilament, Glycoside-..-caprolactone-trimethylene carbonate interpolymer (GCT), in gastrointestinal anastomosis and closure. Materials and Methods: We evaluated 55 gastrointestinal anastomoses and closures using GCT $MONOSYN^{R}$, B. Braun, Germany) in 47 patients who underwent gastric surgery between December 2001 and May 2002 at Seoul National University Hospital. Patient's characteristics, operative procedure, surgeon's opinion of handling properties of GCT, and suture-related complications were analyzed. Results: There were 34 males and 13 females (M:F= 2.6:1) with an average age of 54.2 years old. Forty-five cases of gastrointestinal anastomosis (20 gastrojejunostomies and 25 jejunojejunostomies) and 10 cases of intestinal closure (7 gastrostomy closures and 3 duodenal stump closures) were performed in 41 cases of stomach cancer, three of peptic ulcer disease, two of GIST, and one MALToma. The handling properties of GCT according to the criteria of knot breaking load, knot security, and placing property were always scored with 7 to 9 points (10=excellent, 1=very poor). Two cases of postoperative complications ($3.6\%$) were noted. One was a leak of the gastrojejunostomy site which was successfully managed conservatively, and the other was a stricture of the gastrojejunostomy site which was managed by reoperation (side-to-side jejunojejunostomy). Conclusion: GCT seems to be an applicable suture material for various gastrointestinal anastomoses and closures.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2010년도 춘계총회 및 학술발표대회
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• pp.95-98
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• 2010

• Fisheries and Aquatic Sciences
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• 제14권2호
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• pp.130-137
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• 2011

Visual stimuli of nets, which affect fishing selectivity, vary by twine diameter, color, and material under different light conditions and visual geometries. In this study, two cylindrical model codends of two mesh sizes, 28 and 43 mm, were made of high-contrast, dark brown polyethylene (PE) netting twine and low contrast, light-blue polyamid (PA) monofilament twine. Each model codend was filled with juvenile seabream and set in the water channel of a light-blue circular tank under a flow speed 0.8 m/s for 30 min. Light conditions were set to relatively bright, dim, and dark. The resulting retention rates of juvenile seabream were 15-35% lower for the low-contrast codend with PA monofilament than for the high contrast PE twine netting under bright and dim light conditions, while no difference was observed under dark conditions. The effects of mesh size and netting contrast on the retention rate were dependent on the light level, while the retention rate due to netting contrast was independent of mesh size. Therefore, low-contrast nets in the codend could help to reduce juvenile bycatch by disturbing the orderly optomotor response.

• Journal of Periodontal and Implant Science
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• 제41권4호
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• pp.185-191
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• 2011

Purpose: The objective of this study was to compare and evaluate the inflammatory responses of three widely used suture materials in the keratinized gingiva and buccal mucosa of beagle dogs. Methods: Silk, polyglycolic acid, and nylon sutures were placed within the mandibular keratinized gingiva and maxillary buccal mucosa of four male beagle dogs. Biopsies were taken 3, 7, and 14 days after suturing. Specimens were prepared with hematoxylineosin stain for evaluation under a light microscope. Results: The suture materials placed in the oral mucosa elicited more inflammatory reactions than did those placed in the keratinized gingiva. The multifilament suture materials caused more inflammatory tissue reactions than did the monofilament suture materials in the oral mucosa. Conclusions: If oral hygiene is well maintained and suture materials are placed in the keratinized gingiva, silk, nylon, and polyglycolic acid are considered to be proper suture materials for oral surgery. However, it is advisable to use monofilament suture materials if the suture site is within the oral mucosa.

• 기본간호학회지
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• 제13권2호
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• pp.225-234
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• 2006

Purpose: This study was done to investigate the effect of self-foot reflexology on peripheral blood circulation, peripheral neuropathy and to determine the feasibility of self-foot reflexology as a nursing intervention. Method: This was nonequivalent control pretest-posttest study with 76 patients with type 2 diabetes mellitus (ages between 40-79) recruited from public health centers in Busan city. Intervention was a 6 week self-foot reflexology, and outcome variables were peripheral blood circulation and peripheral neuropathy(tactile response to monofilament, intensity of symptoms of peripheral neuropathy). ANCOVA was used to do the statistical analysis. A.05 significance level was set for evaluating the effects of self-foot reflexology. Results: The self-foot reflexology was relatively effective not only in reducing peripheral neuropathy(especially tingling sensation and pain) but also in improving ability to sense the 10-g force monofilament. Conclusion: Even though self-foot reflexology was not effective in improving peripheral circulation, it had good effect on improving peripheral neuropathy. Therefore self-foot reflexology can be used as a nursing intervention program for promoting foot care for patients with DM patients.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 1999년도 추계학술발표대회 논문집
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• pp.189-193
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• 1999

Glass fiber의 국내ㆍ외 현황은 최종 용도에 따라 여러 가지 유리섬유를 선별, 적절히 그의 물성을 이용하는데 있으며 아울러 꾸준히 이용도를 넓히고 개척하는데 있다고 할 수 있다. 따라서 유리섬유의 종류도 최고 10여가지가 개발되어 사용하고 있는데 국내는 아직 E-glass fiber만 생산하고 있는 실정이다. 이런 이유는 여러 가지가 있겠지만 시장성 및 활용도가 외국에 미치지 못해 섬유 종류의 다변화가 요구되지 못하며 방사기술의 낙후성도 문제가 있지 않나 추론하고 있다. 특히 spinning system 차이로 인해 현재는 multi-PCB용 유리섬유는 전량 수입하고 있는 실정이다. (중략)

• 패션비즈니스
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• 제10권6호
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• pp.28-37
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• 2006

The purpose of this work is to present three-dimensional models of plain fabrics having various warp and filling yarn diameters. In order to simulate a woven fabric, a 3-dimensional CAD software with NURBS modeling capability was used. Final rendering was performed on the fabric model. It was demonstrated that the changes in yarn diameter could be three-dimensionally modeled through the use of fabric geometry and the 3D CAD. A short RhinoScript program was composed to implement the data importing and model building on the 3D CAD.

• 대한족부족관절학회지
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• 제8권1호
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• pp.16-21
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• 2004

Purpose: To investigate the characteristics of the patients and therapeutic shoes for diabetic patients. Materials and Methods: Forty two diabetic patients who had their own therapeutic shoes which were prescribed somewhere else were studied from March 2003 to December 2003. There were 27 males and 15 females, and the mean age was 62.1 years (range, 49-72 years). Duration of diabetes was average 14 years (range, $6{\sim}30$ years), all had type 2 diabetes. Sensation was examined with 5.07 nylon monofilament. The route of purchasing the shoes, compliance to the prescribed shoes were investigated by interview. The shape of shoe, stiffness of upper, conformity of insole to the shape of the foot were recorded. In-shoe plantar pressure was measured in 15 patients. Results: Eighteen patients were insensate to the monofilament. Seven patients did not wear the therapeutic shoes, and only 18 of 35 patients were wearing the therapeutic shoes more than 6 hours a day. The shoes of 17 patients were prescribed by medical doctor and the rest were purchased by the recommendation of acquaintances or advertisement. Ulcer recurred in four of five patients to whom the shoe was prescribed by medical doctor and the cause of three recurrences were evident by just observing the foot and shoe. The therapeutic shoes were made from 11 different makers. Eight shoes were adequate for diabetic patients with respect to the material, shape of insole, type of shoe. In-shoe plantar pressure was examined in 15 patients and was less than 300 kPa in all patients. Conclusion: The therapeutic shoes for the diabetic patients need to be prescribed by medical doctor for selective patients with neuropathy or previous history of ulcer and follow-up examination is important to monitor the compliance of the patients and adequacy of the shoes.

• Archives of Reconstructive Microsurgery
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• 제21권1호
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• pp.1-7
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• 2012

Purpose: This retrospective study was to determine the functional results of patients who were amputated of their fingertip between patients who were treated with replantation and patients who were treated with thenar flap. Materials and Methods: From 2004 to 2007, we identified and operated 159 patients who were diagnosed with fingertip amputations. Of 159 patients, Eighty-two patients were treated by replantation (67 in men and 14 in women) and the mean age at the operation was 41 years (range, 15-68 years). Seventy-nine patients was treated with thenar flap(54 in men and 25 in women) and the mean age at the operation was 43 years(range, 21-70 years). We compared variables between two groups including, age, gender, diagnosis, duration of hospital admission, grip strength, two-point discrimination, Semmes Weinstein monofilament test, active range of motion (ROM) of the proximal and distal interphalangeal (PIP and DIP) joint, pain (or tenderness), paresthesia, cold intolerance, the Disabilities of the Arm, Shoulder, and Hand (DASH) questionnaire, and finger for activities of daily living (ADLs). Results: The duration of admission was longer in Replantation group than in Thenar flap group(p=0.001). However, the grip strength (p=0.003) and Semmes Weinstein monofilament test (p=0.029) in the Replanation group were statistically superior to the Thenar flap group. The average DASH disability (p=0.003)/symptom score (p=0.007) and ADLs (p<0.001) in the Replantation group was statistically better. In addition, cold intoleranace test of Thenar flap group is worse than the Replantation group. Conclusion: This study demonstrate that fingertip replantation have demonstrated not only to obtain the best appearance but also to gain better functional outcome. However, it is impossible to perform replatation, the thenar flap can be limited alternative method for fingertip amputation in aspect of preservation of range of motion and hospitalization time.