國産스테인레스鋼線系 矯正用線材의 開發과 物理的 性質에 關한 硏究

권오원,성재현,이기대,경희문 대한치과교정학회 1989 대한치과교정학회지 Vol.19 No.2

The physical properties of seven sizes of control groups and experimental group in stainless steel orthodontic wires were studied in tension, hardness, bending, torsion and observation of microstructure. The wires (0.40 - 0.90mm dia.) of round type were tested in the as-received condition. The wires of control groups were TRU-CHROME and REMANIUM, and experimental group was SK wire which was developed by ourselves and made in Korea. The results were as follows: 1. The chemical compositions of control groups and experimental group were austentie stainless steel wires of SOS 304. 2. Higher values of tensile and yield strength in tension were control group I, experimental group, control group II. Maximum tensile and yield strength of experimental group were 203.63 ±1.41kg/mm²in 0.70mm diameter and 148.96 ± 4.88kg/mm² in 0.60mm diameter, and maximum elongation was 5.20 ± 0.57% in 0.45mm diameter. 3. Hardness values of experimental group were similar to control groups. Maximum hardness values were 596.2 ± 13.66 Hv in 0.45mm diameter wire of control group I, 590.5 ± 20.08Hv in 0.50 mm diameter wire of control group II, and 563.6 ± 5.35 Hv in 0.70mm diameter wire of experimental group. 4. Torsion properties of experimental group were similar to control group I and more than control group II. Maximum torsion cycles were 31.8 ± 2.48 in 0.45mm diameter of control group I,17.4 ± 4.84 in 0.60mm diameter of control group II, and 24.6 ± 3.04 in 0.45mm diameter of experimental group. 5. Maximum bending cycles of experimental group were smaller than control groups. Maximum bending cycles were 9.00 ± 0.00 in 0.50mm diameter wire of control group I, 10.0 ± 0.82 in 0.40mm diameter wire of control group II, and 8.0 ± 1.26 in 0.50 mm diameter wire of experimental group. 6. Microstructures of experimental and control groups co-existed with martensited austenite structure and elongated austenite structure. 7. The direction of wire fracture was propagated parallel to torsion direction typically and there was no probability showing wire fracture at inclusions and surface scratches. 8. The type of wire fracture was brittle fracture at initiation site and ductile fracture at core.

부정교합 아동의 성장에 따른 연조직 측모의 변화

권오원,경희문,장병천,성재현,김정민 대한치과교정학회 1989 대한치과교정학회지 Vol.19 No.3

This investigation was undertaken to know how soft tissue facial profile could changed with age. The 3 serial lateral cephalometric roentgenograms of the twenty nine boys and twenty six girls between 9 and 13 years of age were studied and the findings seemed to warrant the following conclusions. 1. The author made the tables of means, standard deviations in each item, sex, age. 2. Soft tissue facial angle, soft tissue facial convexity including the nose tended to increase, but others tended to remain relatively stable. 3. Facial soft tissue thickness increased with age and the growth of facial soft tissue in the middle rgion (point A, LS, LI)was greater than others in the facial region. 4. In the soft tissue vertical proportions, GI'-Sn/Sn-Me' was 1.1, Sn-St/St-Me' was 0.51:1, Sn-LI/LI-Me' was 0.82.1 and those were stable with age.

치성낭종으로부터 유래된 편평상피세포암종 : Report of a Case & Review of Literatures

권혁진,현재훈,박형국,김용각 大韓顎顔面成形再建外科學會 1997 Maxillofacial Plastic Reconstructive Surgery Vol.19 No.2

Odontogenic cysts are relatively common pathologic lesions found in the oral and perioral structures, but the case of squamous cell carcinoma arising from those cysts are very uncommon. After first reported of that case in 1889 by Herman, Schwimmer collected 56 cases of previously reported squamous cell carcinoma arising in residual odontogenic cyst during about past one century. More than 60% of cases of carcinoma developing in odontogenic cysts arising in inflammatory periapical or residual cyst, and these tumors are usually well-differentiated with relatively good prognosis, and often are diagnosed as benign lesion in radiographic or clinical examination, therefore definitive diagnosis must be made by histologic examintation. We report a case and review the literatures, in our case, 78-year old woman were clinically and radiographically diagnosed as residual odontogenic cyst. But in histologic examination after enucleation of lesion, mass of squamous cell carinoma were observed, but in other area, typical cyst wall and lining epithelium were observed. And in some area, carcinoma in situ and invading squamous cell carcinoma into the lining epithlium were also observed.

XENIX OS에서 TERMINAL을 이용한 조합형한글 구현에 관한 연구

권순걸,박재철,이현우,서기영,홍성태 慶南大學校 附設 工業技術硏究所 1992 硏究論文集 Vol.10 No.-

제닉스 시스템의 커널에서는 한글을 읽거나 쓸수가 없으며 한글을 구현하기 위해 바이어스콜이나 비디오램을 직접 억세스하는 등의 컨트롤이 허용되지 않는다. 그러나 제닉스 시스템의 입, 출력 시스템을 잘 살펴보면 한글을 사용하기 위한 해결점을 찾을 수 있다. 영문 제닉스는 키보드에서 입력되는 8비트 코드에서 최상위비트를 무시하여 7비트로 스트립 시키는데 이것을 막고 제닉스가 FOH~FFH까지의 코드를 제어 코드로 사용하지 못하게 함으로써 모든 한글을 터미널상에서 사용 할 수 있게 된다. 한편 제닉스의 표준 메일을 이용 할때에는 80H 이상의 코드가 입력되면 모두 \와 8진수의 조합으로 변경시켜서 출력하는 C함수를 사용하기 때문에 이부분을 수정하고 한글 에코 명령이 포함된 쉘 스크립은 8진코드로 바꾸어 주는 소오스를 활용함으로서 제닉스에서 터미널을 이용한 조합형 한글의 구현이 완벽하게 이루어졌다. Hangul can't be read and used from the kernel of XENIX system. To embody Hangul, the control of direct access of BIOS call or video RAM is not permitted. But a solution to use Hangul can be found through the search of input and output system of XENIX system. English XENIX OS disregards MSB from 8bit code inputting from key board and strip 7 bit. To prevent this, stty-istrip command is used. And by using stty-ixion command not to use control code from FOH to FFH of XENIX, All of Hangul can be used at the terminal. To satisfy these conditions stty-istrip-ixon command is inserted at each user's profile. While sending the letter through the standard mail of XENIX, /user/lib/mail. local program is available. then Hangul is not supported on mail. local, the reason is that if the code over ASCII code 80H is inputted in the mail. local program. C function outputting through the change into the combination of all \and octal number is used, but by modifying mail. local, all of Hangul can be available, and the shell script containing Hangul echo command can treat Hangul at the terminal by using convc source which change source to octal code. In this way combinated Hangul using the terminal from XENIX OS ard completely embodied.

신경섬유종증 환자에게서 발생한 특발성 혈소판 감소증 1예

권세훈,김형호,강지인,장재혁,원경준,장재현,김상용,배학연 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.3

Idiopathic thrombocytopenic purpura is a disease characterized by thrombocytopenia in peripheral blood with positive anti-platelet antibody titer, no splenomegaly, the presence of megakarocyte. The causes of idiopathic thrombocytopenic purpura were usually related to autoimmune disease, infection and drugs. A 46-years-old man was admitted for evaluation of abdominal mass. He has many cafe-au-lait spots and nodules in almost skin for 30 years. Several years ago, he palpated mass in Lt. inguinal area. hIe has known the abdominal mass after checking abdomen CT in local clinic and visited our hospital for evaluation of abdominal mass. At admission, laboratory tests showed hemoglobin 12.5 g/dL, hematocrit 38.4 %, WBC 5,460 /㎣ (neutrophil 64.5%, lymphocyte 21.7%, monocyte 4.1%, eosinophil 5.4%), reticulocyte 0.7%, Platelet 52,000 /㎣, total protein 6.51 g/dL, albumin 3.80 g/dL, alkaline pohsphatase 161 IU/L, AST 110.7 IU/L, ALT 64.9 IU/L, total bilirubin 0.44 ㎎/dL, BUN 18.4 ㎎/dL, creatinine 0.79 ㎎/dL. Peripheral blood smear showed normocytic normochromic anemia, thrombocytopenia. Bone marrow aspiration smear showed normoplastic myeloid and erythroid precursor. The bone marrow biopsy section shows normocellular marrow (35%) for his age and mildly increasing myeloid cell lineage. We have experienced a case of idiopathic thrombocytopenic purpura in a patient being in neurofibromatosis and therefore reporting it with documentary records. 저자들은 신경섬유종증 환자에서 특별한 원인을 발견할 수 없었음에도 특발성 혈소판 감소증이 발생한 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.

정상교합자의 치열궁 형태

권용철,성정옥,권오원,성재현 대한치과교정학회 1989 대한치과교정학회지 Vol.19 No.1

This study was designed to investigate dental arch shapes buccally and lingually at Bracket Level of Koreans. This involved studying 63 inviduals (37 males, 26 females) with normal occlusion ranging in age from 17 to 24 yesrs old. The landmarks were digitized and measurements and statistical analysis were performed by NEC 9801 V-M computer. The Results were as Follows: Bicanine width, Bipremolar width and Bimolar width were larger in males than in females. Buccal and lingual arch form and coordination form were obtained by NEC 9801 V-M computer. The parabolic equations which represents buccal and lingual arch form were obtained.

탈수 케이크의 내부 특성 I-수분 및 비저항 분포

권재현 인제대학교 1999 仁濟論叢 Vol.14 No.3

정수장 슬러지와 침출수 처리장에서 발생하는 활성슬러지의 탈수성을 비교 평가하고 케이크의 내부특성을 규명하였다. 본 연구에서는 부크너 판넬 실험에 의해 여과구성식을 결정하였는데, 압축계수 n가 모두 1 이상으로 고압축성임을 알 수 있었고 활성슬러지의 압축성이 상대적으로 더 높았다. 압축성은 압축계수 n 뿐만 아니라 경험상수 pa에 의해서도 큰 영향을 받았는데 작은 압력 차에도 압축성이 높고 폐색되기 쉬운 케이크 내부 특성을 갖고 있는 활성슬러지(침출수)의 경우 여재 부근 약 10% 구간에 부분공극율이 급속히 감소하는 밀막이 존재하여 케이크내 공극율 변화율이 가장 큰 값을 나타내었고 이로 인해 평균비저항이 크게 상승함으로서 고압축성 슬러지의 밀막 형성과 케이크 폐색성이 슬러지 탈수의 중요한 저해 요인임이 밝혀졌다. Dewatering is an essential process in accomplishing volume reduction or moisture reduction of water and wastewater treatment plant sludges. This moisture removal results in decreased transportation costs, improved sludge handleability and provides a more readily combustible material for incineration. Because the cost of sludge dewatering is often the greatest expense of sludge management, there is much interest in improving the design, energy efficiency and performance of sludge dewatering facilities. Compressible sludges used in this study formed a thin skin next to the media during filtration. This implied that porosity(moisture content) and specific resistance changed rapidly at low pressures.

이동 단말기용 내장형 slot 안테나 구현

권원현,허재헌 안양대학교 산업기술연구소 2002 自然科學硏究 Vol.9 No.-

본 논문에서는 이동통신 단말기용 내장형 안테나를 연구 개발하였다. 개발된 안테나는 동축형 구조를 갖고 있으며, 스트립 선로를 이용하여 급전 구조를 구현하였다. 안테나의 공진부는 슬롯 구조를 갖는 동축 슬롯 공진형으로 설계하여 IMT-2000 대역인 2.0 GHz 대역에서 공진이 가능하도록 하였다. 구현된 안테나는 26 x 13 x 1.2 ㎣의 크기를 지녀 이동통신 단말기에 쉽게 내장할 수 있음을 알 수 있었다. In this paper, embedded antenna for wireless mobile phone is developed. Developed antenna uses the coaxial type slot structure and its feeding line is implemented by using microstrip line. Resonator part of slot antenna is designed utilizing coaxial type slot resonator structure, and its design parameters are optimized to have 2.0 GHz resonance frequency for IMT-2000 handset. Implemented antenna has 26 x 13 x 1.2 ㎣ physical dimensions, which can be easily applicable to an embedded antenna of mobile phone.

BaTiO₃PTC 소자와 진공 열증착된 Al 전극의 접촉 특성

권혁주,전본근,이재성,이용수,이용현 경북대학교 센서기술연구소 1992 센서技術學術大會論文集 Vol.3 No.1

개인휴대 단말용 무선부 회로 설계 개발

권원현,허지헌,홍진표 안양대학교 자연과학연구소 1996 自然科學硏究 Vol.3 No.-

본 논문에서는 미래의 개인휴대통신 서비스용 단말인 1세대 PDA (Personal Digital Assistant)의 설계, 개발 및 시험에 관하여 서술하였다. 135 x 76 x 18 ㎜ 크기의 개발된 제품은 기존의 전자수첩에 pager의 기능을 부가시킨 Pager PDA로서 320 MHz 대역의 1200bps/2400bps 정보를 모두 수신 가능하며, 전국적인 서비스가 가능한 광역 페이져의 형태로 설계하였다. 이를 위해 사용지역에 따라 주파수가 자동으로 변환되는 PLL 형태의 국부 발진기를 설계 개발하였다. 시험결과 개발된 제품은 일반 페이져가 만족하여야 할 IEC 표준 규정을 모두 만족하였으며, 수신감도 또한 우수함을 알 수 있었다. In this paper, first generation of PDA(personal digital assistant) in which the function of pager is merged into electronic notebook has been developed and commercialized to fulfill the requirement of PCS equipment. Developed product of 135 x 76 x 18 ㎣ size operates in 320 MHz paging frequency bands and receives 1200bps or 2400bps paging data. And also, it adopts PLL type local oscillator whose operating frequency changes with the user locations to ensure the nationwide paging services. Experimental results show that the developed product meets well all of the IEC specifications and has high receiving sensitivity.