• 공업화학
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• 제3권3호
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• pp.491-498
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• 1992

2-hydroxyethyl methacrylate(HEMA)나 스틸렌을 단독 혹은 혼합하여 ${\gamma}-ray$를 사용한 동시조사법으로 불소수지 필름에 공중합시켰다. 단량체 농도, 조사속도, 조사량, 용매형태 및 HEMA와 스틸렌의 혼합조성비가 방사선 그라프트율에 미치는 영향을 검토하였다. HEMA 단독으로 불소수지 필름에 그라프트시킨 경우의 그라프트율은 자주 적었으나 HEMA와 styrene 혼합물의 그라프트 공중합은 좋은 수율을 나타내었다. 그라프트 용액에 황산을 첨가하면 그라프트율 상승효과가 나타났다.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제23권2호
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• pp.163-168
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• 2001

Purpose : This study is conducted to evaluate the clinical success of secondary alveolar bone grafting using autogenous iliac particulate cancellous bone marrow in cleft maxilla. Materials and methods : We evaluated 107 cleft patients who had been admitted to the Dept. of Oral and Maxillofacial Surgery of Pusan National University Hospital from January 1, 1991 to January 31, 1999 and had been performed secondary alveolar bone grafting with autogenous particulated cancellous bone marrow from iliac crest. Results : 1. Men were 70 and women were 37, which shows 65.4% and 34.6% and the proportion of males to females was 1.9:1. Unilateral cases were 89(83.2%) and bilateral cases were 18(16.8%). 2. Age of bone grafting is widely distributed from 7 to 29, and the average was 13.2. 3. Success rate was 97.8% in unilateral cases, 94.4% in bilateral cases. Overall success rate was 96.7%. 4. We evaluated the bone graft contour by the percentage of bone attachment level adjacent to the alveolar cleft and the menial side showed 82.4% and the distal 87.7%. 5. The amount of notching the alveolar ridge at the grafted site through the ratio of notching length up to the most apical base to the length of proximal segment anatomic root was 0.19.

• 폴리머
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• 제33권3호
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• pp.268-271
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• 2009

본 연구에서는 방사선 동시조사법에 의해 제조된 FEP-g-PSSA 막 단면을 SEM-EDX 기기로 분석하여 스티렌 술폰산 고분자(PSSA)의 막 내부로의 분포 경향을 연구하였다. 본 실험에서는 그래프트율, FEP 필름 두께, 선량률, 그래프팅 용매 등 여러 조사조건이 그래프트 고분자의 분포에 미치는 영향을 중점적으로 연구하였다. 실험 결과 균일하게 그래프트된 FEP-g-PSSA 막을 얻기 위해서는 필름 두께가 증가할수록 높은 그래프트율이 요구되어지고, 같은 조사 선량에서는 낮은 조사 선량률로 그래프트하는 것이 효과적임을 보여준다.

• Nuclear Engineering and Technology
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• 제8권2호
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• pp.89-99
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• 1976

Polyvinyl Chloride 섬유에 Acrylic acid (AA)를 방사선을 이용하여 Graft 중합 반응시킬 때 Homopolymer의 방지제인 Ferrous, Ferric, Cupric salt을 첨가시켰다. 방사선 선원으로서는 Co-60의 ${\gamma}$-선 또는 Van de Graaff 가속기를 사용하였으며 조사방법으로는 상호조사법을 이용하였다. Graft 중합반응과 Homopolymerization은 반응계에 첨가시킨 Cation에 의해서 영향을 받았으며 그 효율은 $Cu^{2+}$>$Fe^{2+}$>$Fe^{3+}$의 순서였다. Graft 중합반응속도는 방사선 선량율이 $8.5\times10^3$부터 $1.4\times10^{5}$rad/hr 사이에서 선량율의 0.76중에 비례하였고, Craft 중합반응에 대한 활성화 에너지는 $25^{\circ}$부터 $75^{\circ}C$ 사이에서 6.1 Kcal/mole이었다. 이 때 중합반응 용액은 AA-$H_2O$-$(CH_2Cl)_2$로서 Homopolymer inhibitor의 농도는 $4\times10^{-3}$ mole/1이었다. Graft율은 총선량과 선량율이 클 때 증가하였거나 또는 Polymer 팽윤제인 Ethylene dichloride가 monomer 혼합용액과 포화되었을 때 증가되었다. Acrylic acid가 Craft된 Polyvinyl Chloride 섬유는 흡습율, 열수축성, 용융성이 크게 증진되었고 Tensile properties는 original과 별차이를 나타내지 않았다.

• 대한골관절종양학회지
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• 제2권1호
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• pp.78-87
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• 1996

The results of treatment of eighteen lesions of fibrous dysplasia which of them seventeen lesions were treated with surgery were reviewed at the Department of Orthopedic Surgery, College of Medicine, Hanyang University Hospital. We studied to evaluate the functional clinical results and the recurrence according to the type of disease, grafted bone, methods of treatment and location of lesion. We treated sixteen patients(five males and eleven females) and their mean age was 22.6 years. There was no association with skin pigmentation or dysfunction of endocrine system. Twelve patients had a monostotic pattern and four patients had a polyostotic pattern. Twelve lesions were treated with curettage and bone grafting and four lesions in the proximal femur were treated by internal fixation with curettage and bone grafting. One lesion was treated by en-bloc resection. There were eleven satisfactory results in twelve monostotic lesions and there were four satisfactory results in five polyostotic lesions, but the recurrence were four cases, respectively. The two unsatisfactory results were seen in two patients treated by autografting, but there were three recurrence of four lesions in autografting only, one of five in autografting and allografting, four of eight in allgrafting or xenografting. Four of six lesions in upper extremity were recurred after curettage and bone grafting and five of them showed satisfactory results. In pelvic and lower extremity lesions, the recurrence were occurred in two lesions after curettage and bone grafting and in two lesions after internal fixation and bone grafting. The recurrence does not always provide an unsatisfactory functional results and the recurrence showed higher rate in radiologic pattern of ground glass appearance with-out marginal sclerotic rim, but the recurrence according to grafted bone showed similar rates. Curettage and bone grafting is adequate for a symptomatic lesion and firm internal fixation is needed for a lesion in proximal femur. In use of grafted bone, xenograft or allograft may be preferable to autograft because of the disadvantage of autografting like a increased blood loss, prolonged operation times, etc.

• Journal of Periodontal and Implant Science
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• 제30권3호
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• pp.639-650
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• 2000

The purpose of this study was to evaluate clinical changes in graft size after treatment with connective tissue autograft in human. 40 premolar teeth in 23 patients having the following mucogingival problemswere selected. The width of extension, attached gingiva including free marginal gingiva, width of transplant and clinical sulcus depth were measured at the initial examination, 2, 12 and 24 weeks following the connective tissue autograft and free gingival autograft. The change of width of extension, attached gingiva including free marginal gingiva, width of transplant and clinical sulcus depth according to healing process in both graft procedures was statistically analyzed by ANOVA test and independent ttest using SPSS program. The results were as follows : 1. The change of keratinized gingiva in both grafting procedures was increased significantly at 24 weeks post-op. 2. The clinical sulcus depth exhibited no marked changes throughoutthe entire investigation in both grafting procedures. 3 . After 12 weeks, no dimensional variation was seen in graft size in both grafting procedures. 4. Shrinkage differs significantly in both grafting procedures. From the day of graft to 24 weeks after surgery the percentages of shrinkage were connective tissue autograft 55% and free gingival autograft 29%.

• 방사선산업학회지
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• 제8권1호
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• pp.53-57
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• 2014

The kenaf is quickly developing as a renewable resource. Kenaf can be grown under a wide range of weather conditions. Modification of kenaf fiber by graft polymerization provides a significant route to alter the chemical properties, including surface hydrophilicity or hydrophobicity. In this study, kenaf fiber surfaces were grafted with acrylic acid as a hydrophilic group using electron beam irradiation. The grafting rate increased with an increase in grafting time. The FT-IR results confirmed that acrylic acid was successfully grafted onto the kenaf fibers. The wettability of the kenaf fiber was increased, accompanied by acylic acid grafting on the fiber surface. According to the permeability test result, it was found that acrylic acid grafted kenaf fiber reinforced cement composite was more reduced than non-grafted kenaf fiber reinforced cement composite.

• 한국조경학회지
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• 제32권2호
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• pp.120-129
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• 2004

This study was carried out to develop new varieties with early maturing and large fruit size in the Korean native dogwood (Cornus kousa) for woody landscape plants from native sites or cultivated area. The results are obtained as follows; We selected strains with early maturing and large fruit. size from the habitats from 2000 to 2003. ‘SKK 2-1’ had 4.0cm of fruit size while 2.0 cm of native variety. In addition, ‘SKK 2-2’, ‘SKK 2-3’, ‘SKK 2-4’, and ‘SKK 2-5’ with large fruit and early maturing were preliminary selected from the habitats. In the preliminary selections, ‘SKK 2-1’ was finally selected as new early maturing variety with large fruits in 2003. New early maturing variety with large fruit size, C. kousa var. ‘SKK 2-1’ was selected from 200 plants of 5-year-old seedlings in C. kousa in 5-12 Nung wean ri Goo sung myun Yong In, Kyung gi do, Korea in 2000. Their fruits were colorized in September 18, 20∼25 days earlier than October 7 of native varieties. Its fruit diameter is larger than 4cm. Its fruit weight was 5 times as heavy as native cultivars grown in Korea. This useful characters were still inherited after grafting. However, characteristics of growth, leaf, flower, and flowering period were not different from those of native varieties. Therefore, it was very promising landscape woody plant, having large fruits in early fall season. The rooting rate of Korean dogwood was high by the IBA treatment. The optimum date for softwood cutting was on June 25 ∼ July 25 when the rooting rate was more than 80%. In addition. Korean dogwood was easily propagated by grafting. Therefore, new early maturing variety with large fruits, C. kousa var. ‘SKK 2-1’ is easily propagated by softwood cutting or grafting and then is a promising cultivar as a woody landscape plant.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제21권2호
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• pp.189-197
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• 1999

The use of osseointegrated implant has been reported that is an acceptable procedure for the restoration of totally or partially edentulous patient and that offers good predictability of long term success. It is difficult to get high success rate in edentulous maxillae with inadequate bony quality and quantity, and anatomic limitations such as pneumatic maxillary sinus and nasal floor. The various trials such as sinus lifting, bone grafting, guided bone regeneration, trabecular condensation with osteotome, and the use of wide-diameter implant have been introduced to solve these problems. This study was undertaken to assess the evaluation of clinical prognosis of the implant restorations with these various implantation techniques in the maxillary edentulous area. One hundred eight patients were treated with a total of 386 endosseous implants from March 1994 to January 1998 at Dept. of Dentistry, Korea Veterans Hospital in Seoul Korea. The various techniques for implantation in the edentulous maxillae were supplied to overcome the limitations of implant fixation. These techniques consist of sinus lifting, guided bone regeneration, onlay bone grafting, and osteotome trabecular condensation technique. The total success rate of implant restoration of this study was 93% in the maxillae. The success rate of implant restorations with conventional technique was 94.6%, with osteotome trabecular condensation technique was 94.1%, with guided bone regeneration technique was 93.3%, with bone grafting technique was 92.9%, with sinus lifting technique was 83.8%. The success rate on the maxillary anterior area was 95.2% and that on the posterior area was 91.9%. The failures were associated not only with surgical installation techniques but also bony quality and quantity, characteristics of implant, and stress distribution when in function.

• Archives of Reconstructive Microsurgery
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• 제26권1호
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• pp.9-13
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• 2017

Purpose: Fingertip amputations are the most common type of upper limb amputations. Composite grafting is a simple and cost-effective technique. Although many factors have investigated the success of composite grafting, the success rate is not high. Therefore, this study was conducted to investigate whether the microscopic procedure process during composite grafts improves the success rate. Materials and Methods: Thirteen cases of unreplantable fingertip amputation underwent a microscopic resection procedure for composite graft in the operating room. The principle of the procedure was to remove the least devitalized tissue, maximize the clean tissue preservation and exact trimming of the acral vessel and to remove as many foreign bodies as possible. Results: All fingertips in the thirteen patients survived completely without additional procedures. Conclusion: Composite grafting allows for the preservation of length while avoiding the donor site morbidity of locoregional flaps. Most composite grafts are performed as quickly as possible in a gross environment. However, we take noticed the microscopic resection. This process is thought to increase the survival rate for the following reasons. First, the minimal resection will maximize the junction surface area and increase serum imbibition. Second, sophisticated trimming of injured distal vessels will increase the likelihood of inosculation. Third, accurate foreign body removal will reduce the probability of infection and make it possible to increase the concentration and efficiency in a microscopic environment. Although there is a need for more research into the mechanisms, we recommend using a composite graft under the microscopic environment.