大學新入生의 化學의 基礎知識에 對한 調査硏究

呂煥鎭 경북대학교 과학교육연구소 1979 科學敎育硏究誌 Vol.3 No.-

최근 5년간 시행한 구순열 및 구개열에 대한 고찰

여환호,김수민,이기혁,김수관 大韓顎顔面成形再建外科學會 1997 Maxillofacial Plastic Reconstructive Surgery Vol.19 No.3

The congenital deformities of cleft lip and cleft palate have been known to afflict man since prehistoric time. Efforts to correct these abnormities have evolved over the centuries as scientific knowledge has advanced. Although there is no agreement as to when the surgery should be performed, most surgeons adhere to "rule of 10" : the infant must be 10 week old weigh 10 Ibs, have a hemoglobin value 10gm/㎗ and have a white blood cell count no greater than 10 thousands/㎣. Consensus favors performing initial palatal surgery in the child when he is between 18 and 24 months old. The timing of cleft alveolus surgery is usually between 10 and 11 years old. In the period from 1992 to 1996, 38 patients with cleft lip and cleft palate treated at the department of oral and maxillofacial surgery, Chosun university, dental hospital were analysed clinically. The obtained results were as follows. 1. The ratio of male to female was 1.92 : 1 (25/23) 2. The ratio of cleft lip, cleft palate and cleft lip & palate was 1.5 : 1 : 2.5 (12/8/18) 3. The ratio of unilateral to bilateral cleft lip was 5 : 1 (25/5) 4. The ratio of left to right side in unilateral cleft lip was 1.5 : 1 (15/10)

비안와 사골골절의 치료 : 증례보고

여환호,김영균 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1

A naso-orbito- ethmoid(NOE) fracture is very complex diagnostically and therapeutically. The diagnosis of this fractures is usually made by physical findings aided by a CT scan. The primary treatment of NOE fracture must be directed toward the reconstruction of medial canthal ligament and bony skeleton. We prefer to correct lacrimal system abnormalities secondarily A 32-year old male patient visited emergency room of our hospital with NOE fracture. After emergency treatment and consultation with neurosurgery and ophthalmology, we treated this patient by performing reconstruction of medial canthal ligament, bone graft of media orbital rim bloeout fracture, and dorsal nasal cantilever bone graft with calvarial bone. The authors present a case report with literature review.

하악골 골절의 견고고정에 사용된 monocortical titanium miniplate와 관련된 감염증에 관한 연구

여환호,김영균,이효빈,김경원 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.4

Eighty-nine patients with mandibular fracture were treated by open reduction and internal fixation using the monocortical titanium miniplate(Leibinger Co.). Postsurgical intermaxillary fixation was carried out for 2 to 18 days according to the patient's status. Seven patients developed infections postoperatively(7.9%). Five patients were favorably treated by incision and drainage and/or saucerization. But two patients were not controlled by early surgical intervention and should have been followed by plate removal, saucerization and secondary reconstruction including the bone graft. This article reports the postoperative infection associated with miniplate fixation of mandibular fractures and discuss the incidence, cause, treatment and prognosis with careful case analyses.

매복된 하악 제3 대구치 발치시 항생제 투여의 효용성

여환호,박주철,정종훈,강태호 大韓顎顔面成形再建外科學會 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.4

To evaluate the efficacy of antibiotic administration in the impacted mandibular third molar extraction the author investigated 107 patients requiring extraction of the lower third molar who visited at the Department of oral and maxillofacial Surgery. Chosun Dental Hospital and were healthy without medical problems and had no signs and symptoms of infection around the lower third molar. The patients were divided into 4 groups according to the method of antibiotics administration : 13 patients without antibiotics administration(group 1), 30 patients with only intravenous injection of Cefazoline 2.0g 30 minutes before the procedure(group 2), 39 patients with intravenous injection of Cefazoline 2.0g 30 minutes before the procedure and oral administration of follow-up dosages of Augmentin for 1 day(group 3), and 25 aptients with intravenous injection of Cefazoline 2.0g 30 minutes before the procedure and oral administration of follow-up disages of Augmentin for 3 day(group 4). Infection rates after extraction wer calculated and compared according to gender, the age of the patients, the level of impaction, and also compared between four groups. The results were as follows. 1. The overall infection rate was 8.4%. 2. The infection rate was higher in male(11.9%) than in female(4.2%), but there were statistically no significant differences between them. 3. Infection rate was lower in patients under age 30(7.2%) than in patients over age 30(12.5%), but there were statistically no significant between them. 4. Infection rate was higher in patients with complete bony impacted tooth(11.1%) than in patients with partial bony impacted tooth(6.5%), but there were statistically no significant differences between them. 5. Infection rate was 7.7% in group 1, 10.0% in group 2, 10.3% in group 3, 4.0% ingroup 4 and there were statistically no significant differences between groups. In summary, it is more important to extract the impacted lower third molar under aseptic condition and to minimize the injury of tissue if possible than to administer the preventive antibiotics in reducing the infection rate in healthy patients without medical problems who had no signs and symptoms of infection around the lower third molar.

初·中等學校 科學敎育課程(化學嶺域)의 連繫性 考察

呂煥鎭,金鎭憲 慶北大學校 師範大學 1987 敎育硏究誌 Vol.29 No.-

We must select the adequate teaching-learning contents to the step of learning development to learn material and energy, the fundamental concepts of modern chemistry and it is inevitable that teaching-learning contents should connect between curricula of elementary-secondary school. Therefore this study analyze the following items on chemistry sphere of science curricula in elementary-middle-high school. 1) The character of chemistry-education. 2) The objective. 3) The learning-contents in units and concept sphere. 4) The contents and inquiry process in experiments. The major findings of this study are drawn as follows: 1) The connection is considered in the character of chemistry education. 2) The connection is considered well in general objective and affective objective but badly in cognitive and psychomotar objective. 3) The connection of the unit in learning contents is considered well between elementary school and middle school but badly on the whole. The connection of the learning-contents is different according to concept sphere and the connection between middle school and high school is better than that between elementary school and middle school. 4) The mean ratios of elements in inquiry process is increased gradually acceding to the level of each degree-school but is relatively high in middle school.

대부도 및 제부도 연안해역 독립영양 부유생물군집의 생태학적 고찰

여환구 한서대학교 산학협력연구원 부설 환경연구소 1999 환경연구소 논문집 Vol.2 No.-

대부도 및 제부도 인근 해역에서 식물플랑크톤 군집구조의 파악을 위해 1996년 5월과 10월에 현장관측을 실시하였다. 연구해역의 식물플랑크톤 군집은 대체로 규조류 종들이 우점하였고 특히 Skeletonema costatum과 Parlia sulcata는 계속 우점하였다. 식물수문적 수역구분을 위해 시도한 집괴분석의 결과는 5월에는 특징적 양상이 보이지 않았으나 10월에는 육지에 인접한 수역과 바깥쪽 수역이 분리되었다. 한편 식물플랑크톤 군집의 종다양성지수는 5월에 1.98 - 2.54, 10월에는 1.91 - 2.53의 범위에 있었으며 대체로 2.0을 넘는 갑을 보였다. The structures of phytoplankton communities in the coastal waters of Taebudo and Jebudo were investigated two times, in May and October, 1996. Skeletonema costatum and Paralia sulcata, diatom species dominated in this study area continuously. The result of cluster analyses between the sampling stations didn't show characteristics in May, but the result in October showed seperated phytohydrographic regions, adjacent waters to the land and the waters far away from the land. Species diversities ranged from 1.98 to 2.53 in May and from 1.91 to 2.53 in October, and most of the values were higher than 2.0.

신경섬유종증 환자의 외과적 치험 2례

여환호,안병후,김수관,김영균 大韓顎顔面成形再建外科學會 1992 Maxillofacial Plastic Reconstructive Surgery Vol.14 No.4

Tumors arising from nerve tissue are uncommon in the oral maxillofacial regions. Neurofibroma, a benign neurogenic tumor, can occur as circumscribed solitary or multiple lesions. A solitary neurofibroma is seldom undergo sarcomatous transformation, but fibromatosis is common. Therfore, it is important that we observe the oral and radiographic changes to help minimize the tremendous potential of the disease for facial disfigurement and altered function. The turmors were exised and there are no evidence of recurrence. The patients are satisfied with function and esthetic aspects.

白金錯物의 抗癌性에 對한 分子軌道論的 考察

呂煥鎭 慶北大學校 1984 論文集 Vol.37 No.-

Extened L.C.A.O.M.O. investigations in to the anticancer activity of platinum-complexes were carried out. Cis-Dichlorodiammine platinum (DDP) and its derivatives were successfully explained to have anticanccer activity but the trans-forms not to have. It has been found that the crystal field splitting of the cis-Pt complexes are narrower than that of the transforms, and the Pt-Cl bond strengths of cis-forms are weaker than that of the trans-forms. It could be belied that the cis-forms are more easily excited than the trans-forms, and the Pt-Cl bonds are easily breaking. It also found thau the bound beteen Pt-atom and Cl-atom in DDP molecules have jonic character, while Pt-N bond have covalent character. This means that the Cl-atom in DDp is easy to leave out as Cl^- in vivo. In Conclusions. It agress with experimental result that the species. <표 참조> combine to cellular component and interfere with the growth of cancer cell.

금속사출성형에 의한 중합금 소결체 부품 제조에 관한 연구

여환균,김병진,김길수,김성훈,송준호,한관희 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.2

In this study we demonstrate that a small complex part of a tungsten-based heavy alloy (W-Ni-Cu) can be readily manufactured by utilizing the metal injection molding (MIM) technology. We use a simple thermoplastic binder system, containing low density polyethylene, paraffin wax, and stearic acid. To remove the organic binder from the molded part, we employ the solvent extraction and thermal debinding processes. Densification of debound parts is achieved by sintering in hydrogen atmosphere. The experimental results of the optimization of process variables to manufacture the heavy alloy part are described, with a brief discussion.