RF Magnetron Sputtering법에 의해 증착된 Ni - Zn Ferrite 박막의 물성 연구

공선식,조해석,김형준 한국진공학회 1992 한국진공학회 학술발표회초록집 Vol.- No.-

RF Magnetron Sputtering에 의해 증착된 Ni-Zn-Cu Ferrite 박막의 물성에 미치는 기판온도의 영향

공선식,조해석,김형준,김경용 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.5

We investigated the effect of substrate on the properties of the Ni-Zn-Cu ferrite thin films deposited on SiO2 (1000∼3000${\AA}$) / Si (100) substrate at various conditions by rf magnetron sputtering. A disktype Ni-Zn-Cu ferrite sintered by conventional ceramic process and argon gas were used as a target and a sputtering gas, repectively. The compositions of the thin films measured by EPMA were similar to target composition (Fe: 65.8 at%, Ni: 12.7 at%, Cu: 6.7 at%, Zn: 14.8 at%) irrespective of substrate temperature. Amorphous thin films were deposited when substrate was not intentionally heated, but the films came to crystallize with increasing substrate temperature, and crystalline thin films were deposited at substrate temperature above 200$^{\circ}C$. Below 250$^{\circ}C$ saturation magnetization (Ms), remanence (Mr) and coercivity (Hc) of the ferrite thin film increased with the substrate temperature due to the increase of grain size and the improvement of crystallinity. And above 250$^{\circ}C$, Ms, Mr increased slightly, but Hc of the amorphous thin films increased due to crystallization, whereas that of the crystalline thin films decreased because of grain growth and stress release.

임산부의 체형변화에 다른 임부복 연구

강성미,공선식,박연희,박은자,서경숙,유수미,세끼구찌,이현영 연세대학교 생활과학대학 1991 婦學 Vol.24 No.-

LTCC-M 기술을 이용한 내부실장 R, L, C 수동소자의 특징 및 LMR용 PAM개발

김인태,박성대,강현규,공선식,박윤휘,문제도 한국마이크로전자및패키징학회 2000 마이크로전자 및 패키징학회지 Vol.7 No.1

Low temperature co-fired ceramics on metal (LTCC-M) is efficient for embedding passive components with good tolerance in a module due to the dimensional stability in x and y directions by the constraint of metal core during the firing. In addition, the radiation noise can be reduced by metal core. In this paper, embedded passive components were introduced and a power amplifier module (PAM) fabricated by using the passive components was explained. The embedded passive components in test patters showed the tolerance of 10~20% and the good repeatability in tolerance of embedded passives was maintained in module fabrication. The shortened traces in multi chip modules (MCMs) make the signal delay time decreased and the embedded passives simplify the packaging processes owing to the less solder points, which enhance the electrical performance and increase the reliability of the modules. The LTCC-M technology is one of the promising candidates for RF application and is expected to expand its applications to power and high performance devices. 금속기판 위에 결합된 저온 소성 세라믹(low temperature co-fired ceramics on metal, LTCC- M)은 소성 후에 x-, y- 방향으로의 수축을 1% 이하로 억제할 수 있어 수동 소자를 내장하는데 매우 유리하며, 금속 기판 전체를 접지로 사용함으로써 노이즈를 감소시킬 수 있다. 본 고에서는 내부 실장 수동 소자별 특성차에 대하여 소개하고, 이러한 내부 실장 소자를 이용하여 실제로 제작된 PAM(power amplifier module)을 소개하였다. 내장된 수동 소자는 테스트 패턴 상에서 10~20%의 변화값을 보였으며 실제 모듈에 적용하여도 목표치에 부합하는 소자 구성이 가능하였다. 수동 소자가 내부에 실장됨으로써 신호 처리 시간을 감소시킬 수 있고, 납점의 감소로 공정을 단순화시킬 수 있을 뿐만 아니라 신뢰성 또한 증가시킬 수 있으므로 향후 RF모듈 외에 파워 및 고기능 소자 등 다양한 분야에 응용이 가능할 것이다.

탄소섬유강화 유리복합재료의 제조 및 특성분석

조해석,김상덕,조호진,공선식,최원봉,백용기,김형준,김환,Cho, H.S.,Kim, S.D.,Cho, H.J.,Kong, S.S.,Choi, W.B.,Baek, Y.K.,Kim, H.J.,Kim, H. 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.8

We investigated the influence of several processes, including the preparation of slurry and preform and the heat-treatment of the preform, on the properties of composites to fabricate the carbon-fiber reinforced glass composites having good mechanical properties. Cerander was determined to be the best binder among Cerander, Rhoplex and Elvacite 2045 by the dipping test and the binder within a preform could be completely eliminatd by burning out the specimen under 10-6 Torr at 400$^{\circ}C$ for more than 1h. The fracture behavior of a composite was largely dependent on the uniformity of carbon-fiber distribution within the composite and the heat-treatment condition of the composite. The higher the glass content, the more difficult to obtain uniform distribution of carbon-fiber. As the hot-pressing temperature increased, the densification process of the composite and the formation of pore due to oxidation of carbon fiber occurred competitively. But, above 1000$^{\circ}C$ the latter played a predominant role. We could fabricated the densest 15 vol.% carbon-fiber-content glass composite having the highest toughness and flexural strength of 250 MPa by hot-pressing under 15 MPa at 900$^{\circ}C$ for 30 min.

下顎骨에 發生한 良性白堊芽細胞腫의 治驗例

Sang Chull Lee(李相喆),Yeo Gab Kim(金麗甲),Seon Sik Kong(孔宣植),Hyun Chull Kim(金賢哲),Jong Tae Lee(李宗泰) 대한구강악안면외과학회 1984 대한구강악안면외과학회지 Vol.10 No.2

We had presented a case of benign cementoblastoma of left mandibular body area of 16 year old female patient. The benign cementoblastoma, as defined by the W.H.O., is a neoplasm characterized by the formation of sheets of cementum-like tissue which may contain a very large number of reversal lines and be unmineralized at the periphery of the mass or in the more active growth area. The patient was admitted to Department of Oral & Maxillofacial Surgery, Kyung Hee University Medical Center with chief complaint of painless swelling on the left mandibular body area. We were certained of benign cementoblastoma through clinical and radiographic feature, and then performed surgical enucleation of tumor including removal of involved teeth. After 9 months follow up check, we noticed the bony replacement of operation site and no recurrence and so patient had an temporary removable partial denture.

顎顔面部에 發生한 軟組織疾患의 診斷時 Ultrasonography의 應用에 관한 硏究

Lee Sang Chull(李相喆),Kim Yeo Gab(金麗甲),Kong Seon Sik(孔宣植) 대한구강악안면외과학회 1985 대한구강악안면외과학회지 Vol.11 No.2

Ultrasonography is known to provide valuable information concerning the size, nature and location of soft tissue lesions. So that It was utilized for diagnostic purposes for the ten years. It was originally utilized mainly in opthalmology and obstetrics and gynecology. But in recent years, it was very useful in diagnosis of soft tissue masses In oral and maxillofacial area. This technique is non-invasive and inexpensive, and has not radiation hazard when compared to computerized tomography. Ultrasonography is capable of differentiating not only cystic form solid lesions but also can be helpful in the diagnosis of malignant vs. benign masses. A ultrasonic study was performed in 5 patients with various soft tissue lesions in oral and maxillofacial region (cystic hygroma, intramuscular hemangioma, neurilemmoma, tuberculous lymphadenitis, abscess) using B-scan(gray scale) ultrasonography. The results are summerized below. 1. Cystic hygroma showed internal echo free pattern, enhancement of posterior detail and multiloculated well delineated oval shaped outline. 2. In intramuscular hemangioma, ultrasonography demonstrated internal echo free pattern and two posterior attenuation were made by two calified body. 3. Neurilemmoma showed homogenous internal echo pattern, and well delineated oval shaped outline. 4. In tuberculosis lymphadenitis, internal nature was not coincided with computerized tomography, but size and location were coincided with that. 5. Suppurative abscess on masseter muscle showed internal echo free pattern.

成長期 患者의 下顎頭 骨折時 顎關節의 再形成에 關한 考察

Sang Chull Lee(李相喆),Yeo Gab Kim(金麗甲),Jae Hee Ahn(安在羲),Seon Sik Kong(孔宣植),Hyoun Chull Kim(金賢哲) 대한구강악안면외과학회 1984 대한구강악안면외과학회지 Vol.10 No.2

This is a case report that deals with TMJ remodeling after both condylar fractures in a puberty child. Patient, 14 years old boy, was referred to our department from local hospital for the evaluation of the traumatic injuries on the face which was developed by traffic accident 10 days ago. On the basis of clinical and radiographic examinations, he was diagnosed as both mandibular condyles and symphysis fractures, right maxillary alveolar fracture, and multiple teeth injury. The mandibular and maxillary fractures were treated with closed reduction and intermaxillary fixation with arch bar and multiple loop wiring. IMF was applied for two weeks and early movement of jaw was carried out to prevent TMJ ankylosis. Endodontic and prosthodontic treatments were performed for the restoration of the missing teeth. Patient was examined periodically for the evaluation of TMJ function and remodeling. On the 10th day after trauma (on the admission day), the intracapsular both condylar fractures were observed in the panormaic view. The both fragments were displaced anteriorly which were located below the articular emnences. The contour of fragments was superimposed with condylar stump in the panormaic view. In the P-A mandible view, both fragments was slightly displaced to the medial side. On the 3rd week after trauma (after removal of IMF), the contour of condylar fragments were slightly disappeared and the radiopacity of both TMJ was observed, but the sigmoid notches and coronoid processes were seen as normal contour. On the 3rd month after trauma, the fragments of condylar heads resorbed completely and the articular surfaces of condyle became round in shape. Both coronoid processes were elongated and the articular space was observed distinctly. On the 9th month after trauma, condylar processes similar to normal were repositioned anterior to glenoid fossae. The deepening of sigmoid notch and elevation of coronoid process to zygomatic arch were noted. Articular fossa became to be shallow and articular eminence was flattened. On the 18th month after trauma, the complete resorption of condylar fragments and remodeling of condyle were observed. Deepended sigmoid notch and elongated coronoid process were apparently recognized. Condylar heads were repositioned anterior to articular fossae in the panoramic view. In the P-A mandible view, left condyle was seen as normal, but the neck portion of right condyle was markedly curved to lateral side. In spite of the changes of TMJ function and structures, viz elongation of coronoid process, deepending of sigmoid notch, flattening of articular fossa and eminence, and anterior repositioning of condylar process, patient complained nothing and could function absolutely.

顎下部에 發生한 Cystic Hygroma의 治驗例 및 文獻的 考察

Sang Chull Lee(李相喆),Yeo Gab Kim(金麗甲),Jae Hee Ahn(安在羲),Seon Sik Kong(孔宣植) 대한구강악안면외과학회 1984 대한구강악안면외과학회지 Vol.10 No.1

This is to report a case of cystic hygroma occured in the left submandibular area of 12 year-old male patient. The patient was admitted to Department of Oral and Maxillofacial Surgery, Kyung-Hee University Medical Center with the chief complaints of left submandibular swelling. Cystic hygroma are a benign neoplasm of developmental origin that are characterized by large endothelial-lined space and found predominantly in the region of the head and neck, commonly in the posterior trianglar of the neck, but in this case, the lesion was found in the anterior triangle. In this case, cystic hygroma is not invade the floor of the mouth and base of the tongue and surgically excised specimen is ovoid, lobulated and 6㎝ × 2㎝ × 4㎝ in size and that is filled with watery, straw-colored fluid. The histological appearance is that of multiple dilated and collapsed lymphatic channels lined by a single layer of flattened endothelium. Focal lymphocytic infiltration as well as small sprouts or buds of lymphangiomatous tissue may extend into adjacent tissue. It is best treated by surgical excision soon after recognition in order to prevent extensive local growth and expansion. This case is of interest because their diagnosis was made when the patient was 12 year-old male patient.

Acrylic Resin Splint 와 Circumferential Wiring을 使用한 小兒의 下顎骨 骨折의 治験 2例

Sang Chull Lee(李相喆),Yeo Gab Kim(金麗甲),Jae Hee Ahn(安在羲),Seon Sik Kong(孔宣植) 대한구강악안면외과학회 1983 대한구강악안면외과학회지 Vol.9 No.1

The mandibular fracture in children is rare than adults. The features of fracture and techniques for treatment of mandibular fracture in children is various and poses special problems of reduction and immobilization of the fractured fragment. Acrylic resin splint with circumferential wiring is a valuable fixation which permits the movement of the jaw immediately after operation. The present studies reveal that acrylic resin. splint with circumferential wiring may be successful fixation for the management of mandibular fracture in children.