Effect of Impact Load on Splice Length of Reinforcing Bars

Hyeon?Jong Hwang,Fan Yang,Li Zang,Jang?Woon Baek,Gao Ma 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.5

Impact loading damage of reinforced concrete (RC) members deteriorates bond strength of reinforcing bars. To understand the effect of strain rate on the bond strength of reinforcing bars in RC beams under impact load, drop hammer test was performed on twenty-four simply supported RC beams with lap spliced bars at the mid-span. The test parameters were reinforcing bar diameter, splice length, drop height, and hammer mass. The dynamic responses including the impact load history, mid-span deflection history, crack distribution, and strain history of reinforcing bar were evaluated. Although the designed bar development length was 31–69% of the requirement of current design codes under static load, the tensile strength of bar splices was greater than the dynamic yield strength when subjected to large impact energy under impact load. On the basis of the test results, existing design equations for the bar development length under static load were modified to consider the impact loading effect on the bond strength. Factors related to the strain rate effect of materials, impact damage, and impact energy loss were proposed. The prediction of the proposed method agreed well with the tensile strength of bar splices under impact load.

김종삼 시에 나타난 타자적 공간 연구

김소현(Kim, So-Hyeon),김종회(Kim, Jong-Hoi) 부산대학교 인문학연구소 2018 코기토 Vol.- No.85

본 연구는 김종삼 시에 나타난 타자적 공간을 규명하는 것을 목적으로 한다. 레비나스의 ‘타자’라는 개념을 차용하여 김종삼 시에 드러난 공간을 단순히 물리적 공간(physical space)만으로 해석하는 것이 아닌, 정신적 공간(mental space), 실존의 구조로서 그의 시 세계를 논하고자 한다. 궁극적으로는 존재(시인)의 타자적인 것들로 구성된 외부적 공간이 결국 존재의 실존 문제와 직결되어있다는 점을 밝혀내는 일이다. 첫째로, 시인이 주체라는 전제하에 어린아이, 여성, 이웃과 같은 타자의 공간을 살펴보았다. 시인이 축조한 세계는 어린아이, 여성, 이웃으로 명명되는 타인의 공간이다. 이러한 타자적 공간 내부에 진입한 시적 주체는 타자들과 마주보는 형태를 보인다. 따라서 시적 주체는 타자의 얼굴을 ‘마주봄’을 통해 자신의 존재를 확인한다. 둘째로, 시인의 비극적 세계인식이 비롯된 근간을 시인이 체험한 전쟁의 상흔으로 보았다. 시인이 끌어온 레바논, 아우슈비츠 수용소 등의 이 국정서의 공간이 결국 전쟁이라는 거대한 메타포 안에서 시인이 체험한 한국전쟁과 동일한 참혹성, 폭압성을 드러내고 있다. 시인은 전쟁을 겪으며 고통 받은 이들의 비애와 비극적 정서를 공유한다. 시인은 본문에서 이국에 대한 단어들을 가감 없이 사용하는데, 여기서 이국이 주는 거리감은 느껴지지 않는다, 시적 주체는 이러한 이국적 벌거벗음 속에서 실재할 수 있다는 점을 밝혀냈다. 셋째로, 시인이 동경한 신성․초월․환상의 공간을 살펴보며 이러한 타자적 공간이 시인을 계속해서 욕망하게 만들고 강한 애착을 갖게 하지만, 사실상 신성 공간으로의 진입은 불가능하며 결국 추방당하게 되면서 주체의 욕망이 좌절될 수밖에 없는 과정을 확인했다. The purpose of this study is to examine the space of otherness found in Kim Jong-sam’s poems. Borrowing the concept of Levinas’ ‘others’, this author intends to discuss the world of his poems by analyzing space revealed in his poems not just as physical space but as mental space and also the structure of existence. Ultimately, it is to reveal the fact that space as the world of externality consisting of others to the being(poet) is directly associated with the existential matters of the being after all. First, this author has understood that the poet examines the space of others, for example, young children, women, or neighbors, under the precondition of an agent and learns that the space of others named as young children, women, or neighbors confronts the agent and allows the agent to exist as the face of others eventually. Second, this researcher regards the origin of the poet having that tragic view of the world is his wound from the war that he experienced, and the space of exotic mood that the poet draws such as Lebanon and Auschwitz Camp reveals the same cruelty and oppression that he experienced from the Korean War within the enormous metaphor of war after all, and he shares the sorrow and tragic sentiment of those in pain suffering from war. This author has learned that distance from the foreign land is irrelevant here and one can exist within that exotic nakedness. Third, examining the space of divinity․transcendence․fantasy that the poet longs for, this researcher has found that that space of otherness lets the poet keep desiring and become strongly attached, but in fact, it is impossible for him to enter the space of divinity, and finally, he gets to be exiled in the end and the agent’s desire ends up withering helplessly.

제1급 부정교합 환자에서 치료전후 PAR 지수와 두부방사선 계측치의 변화

김현혜,김종철 전남대학교 치과대학 1998 전남치대논문집 Vol.10 No.1

The purpose of this study was to evaluate the relation between the treatment duration and cephalometric measurements and the PAR index in Class Ⅰ malocclusion patients. In 100 Class Ⅰ malocclusion patients, PAR score and cephalometric measurements were taken and analyzed from study model and cephalometric radiographs. The results of this study were obtained as follows; 1. Excellent correlation was exhibited within and between examiners in measuring the PAR score. 2. Treatment duration was correlated with extraction and pre PAR index. 3. ANB, FMA, FMIA and IMPA exhibited positive correlation between pre PAR index and pretreatment cephalometric measurements. 4. 1_ to FP exhibited positive correlation between post PAR index and posttreatment cephalometric measurements, and 1￣ to FP exhibited negative correlation. 5. 1_ to SN, IIA and 1￣ to exhibited positive correlation between % PAR reduction and the change of cephalometric measurements and FMA, FMIA, WITS and UL exhibited negative correlation.

표피 성장인자의 국소적용이 인체 표피화에 미치는 효과에 대한 연구

김현옥,유성종,정승문,김성수 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.3

An understanding of the mechanism of healing has increased dramatically during the past decade. The phenomenon of epithelization is important in the normal resurfacing of a donor site or a partial thickness burn wound. This study was conducted to clarify the effect of epidermal growth factor in wound healing of human. Paired donor sites were created in 18 patients who required skin grafting for either burns or reconstructive surgery. One donor site from each patient was treated topically with silver sulfadiazine cream, and the other was treated with silver sulfadiazine cream containing epidermal growth factor(10ug/ml) (Human recombinant epidermal growth factor ; Sigma, St.Louis, Mo). The donor sites were photographed daily, and healing was measured with the use of planimetric anlysis. The donor sites treated with silver sulfadiazine containing epidermal growth factor had an accelerated rate in all 18 patients as compared with that in the paired donor sited treated with silver sulfadiazine alone. Combining data from all patients demonstrated reduced the average time to 100% healing by approximately 2 to 3 days (p<0.01). Light and electron microscopical study of biopsy specimens taken from the centers of donor sites three days after the onset of healing supported these results. In conclusion, epidermal growth factor accelerates the rate of healing of partial thickness skin wound.

溫山工團 海松林의 衰退分析

朴芝賢,金鍾甲 경상대학교 농업생명과학연구원 2002 농업생명과학연구 Vol.36 No.1

울산ㆍ온산공업단지 주변의 해송림을 대상으로 해송의 잎과 토양에 대한 각종 중금속 및 잎속의 수용성 유황함량 등의 오염물질 분석을 통해 주변의 해송림의 활력도를 파악하여 대기오염에 의한 해송임분의 피해 상태를 분석한 결과는 다음과 같다. 산림토양 pH는 경기화학 주변 해송림이 4.01로 가장 낮게 나타났으며 고려화학 주변 해송림을 제외한 모든 조사지역에서 강산성을 나타내었다. 산림토양 내 중금속함량에서, Zn은 6.20~526.42 ppm, Al은 671.69~2,168.41 ppm, Fe은 59.14~171.97 ppm, Cu는 1.87~159.74 ppm, Cd은 0.02~0.68 ppm, Pb은 3.18~48.63 ppm으로 나타났으며, 일반적으로 고려화학 및 경기화학 주변에서 대체적으로 높게 나타났다. 해송 잎속 수용성유황함량은 공단지역이 0.12-0.24 ppm로 나타났으며, 공단외 지역인 진하리에서는 0.08-0.10 ppm로 나타났다. 특히 경기화학 및 여천동지역은 0.16-0.23 ppm로 높게 나타났다. 잎의 연령별함량 분석에서는 3년생>2년생>1년생의 순으로 잎의 연령이 높을수록 증가하였다. 해송 잎속 중금속 함량에서, Zn은 63.57~1,105ppm, Al은 245.9~1,073ppm, Fe은 158.1~1,322ppm, Cu은 34.74~883.5ppm, Cd은 0.09~2.38ppm, Pb은 1.16~67.99ppm으로 나타났다. 잎의 연령별 중금속함량은 3년생>2년생>1년생으로 잎의 연령이 높을수록 중금속함량이 증가되었고, 특히 경기화학 주변의 해송 잎속 중금속함량이 다른 조사지역보다 높게 나타났다. 산림토양과 해송 잎속 오염물질 간이 상관분석에서 토양속의 Cu, Pb과 잎속 Cu, Pb간에는 정의 상관을 나타내어 밀접한 관계가 있음을 알 수 있다. This study carried out to understand the degree of vigour of Pinus thunbergii forest growing around Ulsan and Onsan industrial complex. It was analyzed the pollutants on leaves and soil of P. thunbergii forest. The pH of soil in P. thunbergii forest around Kyunggi chemical co. was the lowest as 4.1 and severe acidity in all survey areas besides Korea Chemical Co. In the content of heavy metals in soil of survey areas, each content of Zn, Al, Fe, Cu, Cd, and Pb showed as 6.20~526.42 ppm, 671.69~2,168.41 ppm, 59.14~171.97 ppm, 1.87~159.74 ppm, 0.02~068 ppm and 3.18~48.63 ppm, respectively, and were relatively high at the forest soil of Kyunggi Chemical Co. and Korea Chemical Co. The content of soluble sulfur in leaves by leaf age showed to 0.12~0.24ppm at each industrial complex besides Jinhari(0.08~0.10 ppm) of non-industrial area, and increased in order of 3-year-old needles, 2-year-old needles and teh current needles. Especially soluble sulfur content in leaves around Kyunggi Chemical Co. and Yochondong complex showed high as 0.16~0.23 ppm. In the content of heavy metals in P. thunbergii leaves at survey areas, the content of Zn, Al, Fe, Cu, Cd, and Pb showed to 63.57~1,105ppm, 245.9~1,073ppm, 158.1~1,322ppm, 34.7~883.5ppm, 0.09~2.38ppm and 1.16~67.99ppm, respectively and increased in order of 3-year-old needles, 2-year-old needles and the current needles. The heavy metal content of P. thunbergii leaves around Kyunggi Chemical Co. was especially higher than other survey areas. In the relationship of heavy metals in forest soils and leaves, there were positive correlations at Pb content and Cu content in soil and P. thunbergii leaves.

초등학교장의 변혁적 지도성과 교사 효능감과의 관계

임종철,김현정 부산교육대학교 교육대학원 2004 논문집 Vol.6 No.-

이 연구에서는 초등학교장의 변혁적 지도성과 교사 효능감과의 관계를 규명하고자 하였다. 문헌연구를 통해 지도성의 개념과 변천과정 학교장의 변혁적 지도성 이론, 교사 효능감에 대한 이론을 살펴 보았으며, 이러한 배경 이론에 근거하여 학교장의 변혁적 지도성의 하위요인으로 결속촉진, 카리스마, 지적인 자극, 개별적 관심을, 교사 효능감의 하위요인으로 자신감, 자기조절 효능감, 과제난이도 선호를 파악하였다. 그리고 선행연구를 통해서 두 변인의 관계를 고찰해 보았다. 문헌연구를 토대로 연구문제를 해결하기 위하여 부산시내 36개 초등학교 교사를 대상으로 학교장의 변혁적 지도성 및 교사 효능감 질문지로 측정하여 상관관계를 살펴본 결과 교사가 인식한 학교장의 변혁적 지도성 수준은 보통 수준 이상(M=3.30)으로 나타났으며, 하위요인별로는 다른 요인에 비해 지적인 자극을 많이 인식하고 있는 것으로 나타났다. 교사의 교사 효능감 수준도 보통 수준 이상(M=3.29)으로 나타났으며 하위요인별로는 다른 요인에 비해 자기조절 효능감을 보다 많이 지각하고 있는 것으로 나타났다. 학교장의 변혁적 지도성과 교사 효능감의 상관관계는 r=.294(p<.001)로 유의한 상관이 있기는 하나 얕은 것으로 나타났으며, 하위요인간의 상관관계에서는 학교장의 변혁적 지도성의 하위요인인 결속촉진, 카리스마, 지적인 자극, 개별적 배려가 교사 효능감의 하위요인인 자기조절 효능감과 유의한 상관이 있기는 하나 얕고, 자신감, 과제난이도 선호와는 상관이 거의 없는 것으로 나타났다. The purpose of this study was to find out the relationship between the elementary school principals' transformational leadership and the teacher efficacy. To achieve this goal, several research problems were established as follows: First, what is the elementary school principals' transformational leadership (contribution to cohesion, charisma, intellectual stimulation and individual concern)? Second, what is the teacher efficacy(confidence, self-control and preference for task difficulty)? Third, what is the relationship between the elementary school principals' transformational leadership and the teacher efficacy? To solve these problems, both the literature research and questionnaire surveys were used in this study. Through the literature research, the concept of leadership and the process of its change was examined, and theory of the school principals' transformational leadership and its background of formation, the concept and the specific character of the transformational leadership, the primary factors and the effects of the transformational leadership were examined. And then it's attempted to find out contribution to cohesion, charisma, intellectual stimulation and concern for individual teachers, which were subordinate factors of principal transformational leadership. Concerning the teacher efficacy, self-efficacy, the concept of the teacher efficacy, the features of teachers with good the teacher efficacy and the elements of the teacher efficacy were examined. As for the teacher efficacy subordinate factors, teacher confidence, self-control efficacy and preference for task difficulty were investigated. Finally, earlier studies were reviewed to identify the relationship of the two factors. Based on the results of literature research and to solve the research problems, 36 elementary schools and 524 teachers of the schools in Busan Metropolitan City were selected randomly. The instruments used in this study were Gweon In-tak's transformational leadership questionnaire and Lee Hyeon-jeong's the teacher efficacy questionnaire. As for reliability, the former's Cronbach α coefficient was .98, and the latter's was .85. The collected data were analyzed with SPSSWIN Ver 10.07 program. The statistical data on mean and standard deviation were obtained, and t-test and F-test were conducted. In case there was any intergroup gap, Scheffe´ test was implemented as post-test, and the correlation between the two factors was measured by calculating Pearson'r. The findings of this study were as follows: First, the teachers considered their principals' transformational leadership to be on the average(M=3.30). By subordinate factors, intellectual stimulation were rated better than the others. Second, as for the impact of their background variables on their perception of principal transformational leadership, the principals were thought to exercise more transformational leadership by those who were lead teachers, had more than career of 20 years, in their 40s and worked at the schools of C and D grade. And they felt that the female principals displayed transformational leadership more than the male principals did. Third, the teacher efficacy is to be on the average (M=3.29). By subordinate factors, they put higher value on self-control efficacy than on the other factors. Fourth, as for the impact of their background variables on their the teacher efficacy, those who were male, lead teachers, had more than career of 20 years, in their 40s, and whose principals were male, viewed the teacher efficacy more favorably. Fifth, there was significant but weak correlation between the transformational leadership of their principals and their self-efficacy (r=.294, p<.001). By subordinate factors, contribution to cohesion, charisma, intellectual stimulation and individual concern had significant yet weak correlation to self-control efficacy, and they were scarcely correlated to confidence and preference for task difficulty. Based on the above-mentioned findings, the following conclusion was reached: First, how principals could be encouraged to exert more transformational leadership should be studied, and a variety of programs should be prepared to boost the transformational leadership of male principals. Second, in which way the teacher efficacy could improve should be considered. Especially, it's necessary to instill more confidence in teachers and urge them to make a challenge to difficult tasks. Third, as principal transformational leadership had weak yet significant correlation to the teacher efficacy, the former factor can predict the latter to some extent. Fourth, since questionnaire method was utilized in this study, future research should make a qualitative approach by using ethnography

Resilon을 이용한 근관충전 시 수종의 치면처리제에 따른 미세누출 평가

오종현,박세희,신혜진,조경모,김진우 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.2

이 실험의 목적은 Resilon으로 근관충전된 치아에서 자가산부식전처리제에 따른 치근단 미세누출을 평가하고자 함이다. 70개의 단근치를 사응하였고 .04 Taper ProFile을 사용하여 ISO #40까지 근관성형 하였다. 치아는 근관충전 재료와 자가산부식 전처리제에 따라서 15개씩 4개의 실험군과 5개씩 2개의 대조군으로 나누었다. 실험 치아는 치아 장축에 평행하게 잘라내어 염색액의 최대 침투 길이를 측정하였다. 통계분석은 One-way ANOVA test로 분석하였으며 Scheffe test로 사후검정 하였다. 실험결과 자가산부식전처리제를 사용한 2, 3, 4군 사이에서는 통계적으로 유의한 차이를 나타내지 않았다. 그러나 1군과 4군 사이에서는 통계적으로 유의한 차이가 나타났으며 (p < 0.05), 1군에서 가장 적은 치근단 미세누출을 나타냈다. 이 실험 결과에 따르면 Resilon으로 근관충전을 한 치아는 gutta percha와 AH26^(ⓡ)으로 근관충전할 치아와 비교했을 때 더 좋은 치근단 밀폐를 나타내지 않는다는 결론을 얻었으며, Resilon을 사용하여 근관충전을 한 경우에 자가산부식 전처리제의 차이에 따른 치근단 밀폐효과의 차이를 보이지 않는다는 결론을 얻었다. The purpose of this study was to compare the apical microleakage in root canal filled with Resilon by several self-etching primers and methacrylate-based root canal sealer. Seventy single-rooted human teeth were used in this study. The canals were instrumented by a crown-down manner with Gate-Glidden drills and .04 Taper Profile to ISO #40. The teeth were randomly divided into four experimental groups of 15 teeth each according to root canal filling material and self-etching primers and two control groups (positive and negative) of 5 teeth each as follows: group 1 - gutta percha and AH26^(ⓡ) sealer; group 2 - Resilon, RealSeal™ primer and RealSeal™ sealer; group 3 - Resilon, Clearfil SE Bond^(ⓡ) primer and RealSeal™ sealer group 4 - Resilon, AdheSe^(ⓡ) primer and RealSeal™ sealer. Apical leakage was measured by a maximum length of linear dye penetration of roots sectioned longitudinally by diamond disk. Statistical analysis was performed using the One-way ANOVA followed by Scheffe' s test. There were no statistical differences in the mean apical dye penetration among the groups 2, 3 and 4 of self-etching primers. And group 1, 2 and 3 had also no statistical difference in apical dye penetration. But, there was statistical difference between group 1 and 4 (p < 0.05). The group 1 showed the least dye penetration. According to the results of this study, Resilon with self-etching primer was not sealed root canal better than gutta precha with AH26^(ⓡ) at sealing root canals. And there was no significant difference in apical leakage among the three self-etching primers.

Message Filtering을 통한 TMN의 성능향상에 관한 연구

이종옥,김현준 동국대학교 경영대학원 1996 經營論叢-東國大學校 經營大學院 Vol.20 No.-

Today, Distributed Telecommunication Networks are consist of various hetrogeneous equipments. ITU-T suggests TMN for managing these hetrogeneous equipment and services. In reality, there is a few equipment which support ITU-T suggestions. So Q Adaptor is in charge of converting non-TMN qiupment's interface into TMN's. But these QAF(Q Adapter Function) can cause significant overhead if there are many non-TMN equipments in the network. In this paper, the method which can improve management efficiency in TMN by reducing QAF's overhead is proposed. By moving Q Adapter's filtering function from TMN's management system to the outside, the QAF's overhead can be reduced. Prototype network Management System was built using NetExpert, lex and c. The proposed system was simulated using 1,647,977 sample messages from TDX-PS switches. The result of the simulation are as follows; 1) With proposed system, the number of message row was reduced from 9,876,917 to 6,067,913 with 61.44 % reducing rate. 2) With proposed system, Q Adapter's message processing time was reduced from 4,961 seconds to 1,471 seconds with 29.7% reducing rate. 3) With proposed Message Filtering System, the QAF's performance improvement was founded, so TMN's management efficiency is expected. Though there is significant improvement on Q Adaptor's functions, the proposed system has some limitaions. The prototype was developed and simulated in batch processing mode and for only TDX-PS switches. So, from now on, the sudy on generalizing proposed system to fit on only hetrogeneous equipment will be suggested.

濟州道 菜蔬·花卉園藝의 生産實態, 育成方案 및 流通構造改善에 관한 硏究

李宗錫,吳現道,蘇寅燮,張田益,姜志勇 濟州大學校 亞熱帶農業硏究所 1986 亞熱帶農業硏究 Vol.3 No.-

濟州道의 施設을 理用한 菜蔬類와 球根切花類 및 洋蘭類의 재배실태를 調査한 結果는 다음과 같이 要約할 수 있다. 1. 作目이 토마토와 오이에 編重되어 있어 딸기等을 첨가하여 作目이 多樣化하여야 할 것으로 思料되었다. 2. 施設內의 土壤管理에 대한 認識이 不足하며, 均衡施肥가 施行되지 않고 있었고 土壤酸度도 矯正해야 할 농가가 많았다. 3. Mg이 缺乏된 施設이 대부분이므로 이의 是正이 時急한 課題였다. 4. 施設內 土壤에서 鹽類集積의 被害가 우려되는 곳은 거의 없었으나 裁培年限이 5年以上된 施設에서는 土壤改良이 이뤄저야 할 것으로 思料되었다. 5. 作付體係를 改善해서 年 2期作 體係가 確立되어야 겠으며 施設管利技術이 普及, 育苗技術의 改善 및 共同育苗를 施行해서 健全苗의 養成이 重要課題였다. 6. 濟州道內에서 産業的으로 栽培되고 있는 蘭類 中에서 熱帶産 Cymbidium類가 全體 洋蘭 栽培量의 67.8%로 가장 많았는데 그 中에서도 Eiko, sharnell-5, Kenny가 數的으로 많았다. 7. 溫帶産蘭(東洋蘭)類 中에서는 새우난초類가 數的으로 가장 많았고, 나도풍난, Dendrobrum moniliforme, Cymbidium 風蘭의 順位이었으며, 自生寒蘭은 대 40,396촉이 栽培되고 있었다. 8. 供試 5種의 球根類들은 virus 감염이 甚하여 全量이 virus 無病株로 대체되어야 할 것으로 판단되었다. 9. 서귀포지역의 土壤은 害蟲이 많이 分布하여 球根切花栽培에 큰 위협조건으로 나타났으며 앞으로 도양소독에 대하여 보다 집약적이고 효율적인 方法이 개발되어야 하겠다. 10. 한라산의 고냉지를 利用한 球根의 低溫處理 效果에 對하여 많은 적응시험이 요망되며 道當局은 고냉지의 개발과 利用에 적극적인 지원을 투여하여야 할 것이다. 11. 植栽되고 있는 5種의 球根類 모두 50% 以上이 外國수입에 의존하고 있으므로 國內의 組織培養技術을 利用한 virus 無病良質球根의 生産이 절실히 요망된다. Studies on various cultural practices of vegetable crops, and orchids have been conducted in Chejudo. Followings are the results of such studies. 1. Too much importance has been given to Tomato and Cucumber crops. An additional crop such as Strawberry should be included to broaden the studies. 2. In general, lack of informations on soil managements appear to be prevailing; scheduled fertilization, for instance, has not been performed and pH level must be adjusted on many farm lands. 3. Mg deficiency has been very much in common, therefore, is corection are matter of utmost importance. 4. Problems arising from salt accumulation were nearly unimportant, however, soil improvements through various cultural practices are recommended for those soils which have been continuous cropping for more than 5 years. 5. Planting system should be improved so as to establish 2-crops/year system. In addition, proper extention of various soil management techniques and improvement on nursing techiques are of inportant matters. Commonly sharing community nursing practices must be accompanied in order to provide healthy-seedlings. 6. Among commercially growing orchid species in Chejudo, the tropical Cymbidium species found to be the most widely grown, nearly 67.8% 'Kiko', 'Sharnell-5', 'Kenny' appear to be most in common. 7. Among oriental orchids, Calanthe spp are found to be most prevalent followed in the order of Aerides japonica, Dendrobium moniliforme, Cymbidiums, respectively. 8. The total number of the shoots of Cymbidium kanran being cultivated in Chejudo were found to be 40,396. 9. Virus infections appear to be universal in all 5 species of bulbs studied therefore, virus-free stocks must be essential. 10. Sogwipo-soil, in general, heavily infected by soil-born insects of various kinds are badly affecting bulb productions. More efficient methods of soilsanitations must be studied and introduced in the future. 11. The studies of low temperature treatment on bulb crops by utilizing the high altitude growing in the area of mountain Halla are in great need. An extensive assistance from the provincial government are very much in need in order for the development and utilization of the high-altitude cultivation. 12. More than 50% of the bulbs of the 5 species grown are being imported. Domestic production utilizing 'meristem culture' which enable the virus free stocks are in great demand.

탈회동종골을 이용한 신혈류화골판 형성에 관한 연구

이종호,김현태 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.3

Microsurgical vascularized bone transfer has the disadvantages of limitation of available donor sites, loss of donor function, and possibility of donor site defects or deformity. To overcome these shortage of current microsurgical tissue transfer, the method of creating the neovascularized free flap has been introduced. Potentially, this technique must be an innovation in providing the free vascularized bone grafts that are not limited by natural vascular anatomy. But, as could be imagined technique resulted in unavoidable donor bone defect and additional operation for harvesting the autologous bone. The purpose of this study was to evaluate the efficacy of demineralized allogeneic bone as a possible substitute for autologous bone in fabricating the neo-osseous flap. By histologic, microangiographic and radioisotope method, the viability and vascularity of neo-osseous flap, which has been fabricated using allogeneic bone or autologous bone, was assessed in rat model. After 6 weeks, demineralized allogeneic bone showed consistent bone formation and neovascularization. The clinical and microscopic findings of demineralized allogeneic bone group were inferior to those of autogenous bone with regard to bone regeneration. The amount of bone blood floow per dry weight of demineralized allogeneic bone group was significantly higher than that of autogenous bone, even higher that of control intact iliac bone. In conclusion, findings supported that allogeneic bone could be the potential substitute for autologous bone source in creating a prefabricated neo-osseous flap.