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조현이,정종철,김호성,최재욱,성대경,서지훈,김성범,이계혁 大韓顎顔面成形再建外科學會 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.1
Osteosarcoma is a primary malignant tumor arising most often in the long bone, but rare in jaw bone. Especially osteogenic sarcoma of the mandible is a rare tumor, comprising less than 0.5% of all head and neck tumors. Osteosarcoma occurs cheifly in young persons, and presenting very survival rates. Histopathologically this tumor can be classified three types, osteoblastic, fibroblastic, chondroblastic and classified from low grade to high grade by anaplasia or mitosis of the tumor cells. Sometimes, the exact diagnosis of osteosarcoma is difficult especially in low grade osteosarcoma, even if clinical or radiographical findings suggest to osteosarcoma. So suspcious to malignant bone tumor in clinical or radiological findings, biopsy should be taked from deep portion and multiple area, and sharing the patient history and radiographs with pathologist will assist in the development of the diagnosis. We report a case of low grade osteosarcoma on the mandible initially difficulty in accurate diagnosis. The patient visited our hospital for routine dental treatment but radiographic findings displayed ill-defined radiolucency with osteoid formation on the mandible. Final diagnosis was difficulty in initial biopsy but subsequent biopsy taked from deep portion presented infiltrative growth and mitosis of the tumor cell in some area with small osteoid bone formation, so we could reach final diagnosis as low grade sarcoma. We treated this patient with bloc resection of the mandible and immediate reconstruction with iliac corticocancellous block.
조현석,김대희,송근호 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2011 動物醫科學硏究誌 Vol.18 No.1
A 8-year-old male castrated yorkshire terrier dog with a infectious tracheobronchitis was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. Infectious tracheobronchitis was diagnosed by the history, clinical signs, polymerase chain reaction, laboratory examinations (complete blood count, serum chemistry) and the diagnostic imaging. The clinical signs were improved after antibiotics treatment. Doxycycline is effective for Bordetella bronchiseptica as infectious tracheobonchitis in a dog.
D.C Magnetron sputtering법으로 제조된 GMR 스핀밸브 조성막에서 증착변수들이 증착속도에 미치는 영향
조대현,이찬규,김병수 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
In this study, we have investigated the influence of sputtering conditions(Ar pressure, Input power) on deposition rate of Ni81Fe19, Fe, Co, Cu, Cr86A114, Cr93Ga7 thin films produced by the method of DC magnetron sputtering. In all films, we have observed that the deposition rate increased with input power because of increasing sputter yield, and ion current density. we have found that the deposition rate was decreased with the pressure of Ar gas.
AE 신호의 주파수분석에 의한 Chatter진동의 감시
조대현,이상태,원종식,정윤교 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.5
A machine tool generally has some serious stability problems in the form of tool chatter during the cutting process. Chat-ter vibration deteriorates the surface finish, reduce tool and machine life, accelerates machine tool system component wear, and may lead to an unacceptable noise sound in the working environment. In this study, the behavior of spectral density of AE signal and principal cutting force signal in order to monitor the chatter vibration in the cutting process has been investi-gated. From the results, the reliability of proposed monitoring method has been confirmed.
흉배혈관의 근피 천공분지에 기초한 유리피판의 임상적 이용
조규성,김대영,안호범,이삼용,조백현 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.3
The latissimus dorsi muscle or musculocutaneous flap is one of the most useful flaps in reconstructive surgery. This flap has many advantages, such as its reliable anatomy, long pedicle with large caliber vessels, minimal functional deficit of the donor site, and low incidence of donor site complications. However, the bulkiness of the flap has been considered a disadvantage, so various modifications of technique have been devised. The cutaneous portion of the flap can be safely elevated based on the cutaneous perforating branch of the thoracodorsal vessel. From March 1997 to February 1998, 10 patients underwent reconstructive procedures with thoracodorsal perforator-based free flaps. The composition of the flaps varied in accordance with the nature of the defect. The variances in the flaps were as follows; 3 were cutaneous, 6 musculocutaneous, and 1 osteomusculocutaneous including the rib. All flaps survived with good contour. We concluded that this thin and reliable flap was useful for reconstruction of various defects, and that the composition of the flap, such as subcutaneous, muscle and bone, gave it considerable flexibility as needed.
Chiral Cu(Ⅱ)착화합물과 촉매로 유도된 Carbenoid반응에 의한 2-phenylcyclopropane-carboxylic acid의 광화학 이성체의 합성
조남숙,신대현,이종철,나도영 충남대학교 1985 忠南科學硏究誌 Vol.12 No.2
(-)-(IR, 2R)-trans-menthyl-2-phenylcyclopropanecarboxylate has been synthesized with aid of chiral Cu(Ⅱ) complex catalyst by the addition reaction of menthyldiazoacetate to the styrene. The yield was 80%, the purity of trans-compound over 90% and optical purity 75%. These results show the possibility of synthesis of (-)-(IR, 2R)-trans-2-phenylcyclopropane-carboxylic acid with high purities of optical activity and geometric specificity.
Ruled Surface로 형성된 임펠러 블레이드 전용 CAD/CAM 시스템 개발 Ⅱ : 5-축 가공에 관한 연구 A Study on the 5-Axis Machining
조현덕,정대일,윤문철,최두선,신보성,이응숙,董玉革 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.3
This study is continuous with the study 1 (A Study on the Modeling) and the sample impeller of this study is defined by the modeling process of the exclusive CAD/CAM system developed in the study I. And, this study describes a method for the 5-axis machining of impeller blades formed by ruled surface. Therefore, the exclusive CAD/CAM system is the software for modeling and machining of impeller blades. By using the machining method suggested in this study, we could manufacture impeller blades on 5-axis CNC machining center and the machined impeller was very agreeable to the designed impeller. Thus, theories proposed in this study can be very useful for the 5-axis machining of impeller blades.
이족보행로봇용 통합개발환경의 구현 및 이동경로계획 알고리즘의 설계
조규현,김대원 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
In this paper, an integrated developing environment(IDE) for a biped robot is presented, through which a new path planning algorithm is designed. The IDE is composed of four modules, each of which is designed by using the object-oriented programming techniques. Four modules have the capability of gait control, path planning, mission-level language interpretation, and monitoring respectively. Also, each module exchanges its information each other through database. The new path planting a1gorithm is composed of an environment analysis algorithm and a path search algorithm, and is used in the IDE. In this paper, an extended visibility graph algorithm is proposed as the environment analysis algorithm and the A algorithm is used as the path search algorithm for the path planning of biped robots. Since the path planning a1gorithm is designed by using the object-oriented techniques and is also implemented within the IDE, it has a good adaptability to the changes of algorithm and construction, and also has a high reusability of the designed capabilities.
조경수,정현대 전남대학교 치과대학 1992 전남치대논문집 Vol.4 No.1
Transcranial radiography has the benefit of providing low equipment cost, and it does not require additional space. The diagnosis of the internal derangement can be made on the basis of the measurement of the joint space by using transcranial radiograph. Thus transcranial radiography is one of the most commonly used radiographic techniques of the diagnosis of TMJ disorders. It is generally known that the transcranial radiograph delineates the lateral third of the condyle. This article intends to help reader understand the morphology of the condylar bony structures through the transcranial radiography. Four radiopaque wire were placed on the condyla surface at intervals of two millimeter from the lateral pole. Using 20 dry mandibles and an Accurad-200 healholder (Denar Corp. U.S.A.). The transcranial radiographs were taken. The results were as follows: 1. The wires that are attached at the distance of 2㎜ from the lateral pole delineate the anterior partition of the condylar outline in the standard and corrected transcranial radiographs. 2. The anterosuperior partition of the condylar outline consists mainly of the image of the wires that are attached at the distance of 2.4㎜ from the lateral pole. 3. The posterosuperior partition of the condylar outline consists mainly of the image of the wires that are attached at the distance of 4.6㎜ from the lateral pole. 4. The posterior partition of the condylar outline consists mainly of the image of the wires that are attached at the distance of 6, 8㎜ from the lateral pole.