치아 수복용 불소함유 glass filler의 제조 및 특성

김대성,최세영,김경남,김광만,김중곤 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.3

The purpose of this study was the reaching test of restorative glass according to composition. Mixtures of SrF₂, CaF₂and SiO₂were fused in platinum crucible. The glasses were ground and fraction which passed through a 400 mesh (38㎛) sieve were collected. The powder specimens were analyzed by a DTA and XRD. Then powder specimen were inserted to D. I. water with various of dissolution time and composition at 37℃. Fluoride ion, cation release, solubility, and pH change were estimated. It was clear that the glasses were formed except S0.65. In S0.40, Tg, Ts, and Tc were 630, 672, and 813℃ respectively. In initial 0.5 hrs., amounts of released fluoride ion and cation were about 90% of total released amounts and released rate was decreased with dissolution time. Amount of released fluoride ion and cation were increased with decreasing SiO₂ in glass filler. And released rate was decreased rapidly by adding CaF₂. This was caused by structural variation in glass filler. Solubility was similar tendency with ion released. The pH of D.I. water was 4.5. But in intial 0.5 hrs., pH was 8.2∼9.8., and decreased according to dissolution time. This is caused by ionic changing with cation and H* ion.

지점부 다이아프램의 응력분배 거동

김동표,정경섭,김경남,양경환 충북대학교 건설기술연구소 2002 建設技術論文集 Vol.21 No.1

These days, bridges have a tendency to be long-spanned and simple ‘ thus, the importance of economy and efficiency has increased for bridge construction. As a result, one of the main members on which interest is focused is the diaphragms. In this study, stress variation of the support diaphragms in a steel box girder was considered. This paper deals with the behavior of the stress distribution on the diaphragms on the bearings of a closed section steel box girder bridge due to the continuous casting of concrete slab. Both experimental and structural analyses were performed to verify the behavior of the stress distribution a composite steel box girder bridge under construction. Strain was continuously checked at intervals of 10 to 30 min. from the beginning of the placement by the Time Interval Function of the measuring instrument. The variation of strain on the diaphragms on the bearings are presented herein.

근대 실내 공간 구성원리의 한국적 변형에 관한 연구 : 김수근과 김중업 작품의 실내공간 분석을 중심으로

김은홍;남경숙 한양대학교 2007 韓國 生活 科學 硏究 Vol.27 No.1

Modernism Architecture in international style has made new spatial paradigm using steel and glass until 1900s. This paradigm influenced in indoor space was shown to Works of four great masters, Mies van der rohe, Le Corbusier, Aalvar alto, Frank L. Wright, and some characteristics are found in four great masters' works in common. These characteristics are simplicity of spatial form, usefulness and functionality of design, openness of indoor space, Total design, internal and external interpenetration. These are shown in interior space of Korea modern architecture as changing their conditions. This study drives at what major characteristics changes the way of proper transformation and adaption in two modern architect of Korea, Kim Swoogeun and Kim Chungup as according to modern architecture principals. Some controlling principles are found out in their works, and the ways of transformation and adaption are analogy with its special occasion of Korea.

일렬 자가조혈모세포이식을 받은 다발성 골수종 환자에서 발생한 뇌 톡소포자충증 1례

김계형,송경호,전재현,박완범,박상원,김홍빈,김남중,김인호,오명돈 대한감염학회 2010 감염과 화학요법 Vol.42 No.3

Toxoplasmosis is a rare but fatal complication in hematopoietic stem cell transplant recipients, usually associated with allogeneic hematopoietic stem cell transplantation (HSCT). We report a case of cerebral toxoplasmosis in a patient with multiple myeloma, following tandem autologous stem cell transplantation. A 55-year-old Korean male presented with weakness in both legs that had progressed to both arms. A magnetic resonance imaging scan of the brain revealed multiple, variablesized ring-enhancing lesions with surrounding edema in the cerebral hemispheres and brain stem. Stereotactic biopsy revealed bradyzoites of Toxoplasma gondii in the brain tissue. The patient received trimethoprim-sulfamethoxazole, followed by pyrimethamine and sulfadiazine, accompanying treatment for progressive multiple myeloma. Cerebral toxoplasmosis should be considered as one of the differential diagnoses in patients with neurologic signs following autologous HSCT.

산후에 발병한 특발성 부갑상선 기능저하증 I 예

김정인,김상용,신병철,김경남,서영욱,이범주,김진화,배학연 朝鮮大學校 附設 醫學硏究所 2002 The Medical Journal of Chosun University Vol.27 No.2

Hypoparathyroidism is usually the result of an inadvertent surgical removal of all the parathyroid glands, In some instances, not all the tissues are removed, but the remainder undergoes vascular supply compromise secondary to the fibrotic changes in the neck after surgery, Previously, the surgery for hyperthyroidism was the most frequent cause of acquired hypoparathyroidism. Idiopathic hypoparathyroidism is a relatively rare disease that is characterized by hypocalcemia and hyperphosphatemia due to a parathyroid hormone deficiency of an unknown cause, It usually develops at a young age, and shows various clinical symptoms and signs accompanied with hypocalcemia. In addition, it is rarely associated with polyglandular autoimmune syndrome during the follow-up. Hypocalcemia and idiopathic hypoparathyroidism associated with labor and lactation are rarely reported condition previously. We here describe a case of a woman in whom the symptomatic severe hypocalcemia appeared after her delivery. We reviewed all the previously reported cases and suggest a possible physiological explanation for the association between pregnancy, lactation, and the appearance of symptomatic hypocalcemia.

반복적인 부비동염으로 내원한 Good 증후군 1예

송경호,김계형,김충종,박경운,전상훈,김홍빈,김남중,오명돈,최강원 대한감염학회 2007 감염과 화학요법 Vol.39 No.5

Good 증후군은 흉선종과 면역결핍이 동반되는 질환으로, B세포의 감소로 인한 범저감마글로불린혈증과 CD4^(+)T세포의 감소로 인한 세포성 면역저하가 동시에 나타나는 것을 특징으로 한다. 본 증례는 18개월 전부터 발생한 반복적인 부비동염을 주소로 내원한 43세 남자 환자로, 내원 1년 전 흉선종절제수술을 시행받았으며, 면역학적 검사상 범저감마글로불린혈증과 T세포의 감소 등의 이상 소견이 발견되었다. 정주 면역글로불린과 경험적 항생제(amoxicillin/clavulanic acid) 사용 후 부비동염이 호전되었으며, 예방접종과 정기적인 면역글로불린 투여 후 특이 합병증없이 경과 관찰 중이다. Good's syndrome is the association of thymoma with immunodeficiency, characterized by hypogammaglobulinemia, B-cell lymphopenia and variably defects in cellular immunity with CD4^(+) T-cell lymphopenia and an inverted CD4^(+):CD8^(+) T-cell ratio. We report a 43-year-old male patient who presented with a 18-month history of productive cough and postnasal drip. One year ago, he underwent the operation for resection of a thymoma. Despite of appropriate management, sinusitis relapsed multiple times. He was found to have hypogammaglobulinemia with nearly absent B cells(4/μL). The CD4^(+) T-cell count was 554/μL with an inverted CD4^(+):CD8^(+) T-cell ratio of 0.6. His symptoms and signs improved with antibiotic treatment and monthly administration of intravenous immunoglobulin (IVIG, 400 mg/kg).

보문 : Polyethylene Film포장이 포도 Sheridan의 저장력에 미치는 영향

남상영(Sang Young Nam),김경미(Kyoung Mi Kim),박종천(Jong Chun Park),주선종(Seon Jong Joo),정재현(Jai Hyun Jung) 한국식품저장유통학회(구 한국농산물저장유통학회) 1997 한국식품저장유통학회지 Vol.4 No.1

정사면체에 있어서 2arctam √2 와 109.47˚

金南慶 慶北大學校 1992 論文集 Vol.52 No.-

2arctan √2(=109.47˚) is an angle of vertex-center-vertex in a regular tetrahedron structure. Two derivation methods of the angle are presented Usefulness of 2arctan√2 against 109.47˚, as applied to the solution of regular-tetrahedron structure problems, is demonstrated.

수종 근관충전용 sealer의 물리적 성질

김경남,이서영,석주경 大韓齒科器材學會 1993 대한치과재료학회지 Vol.20 No.2

A primary goal of successful endodontic therapy is the complete obturation of the root canal. The root canal sealer is an extremely important component of the root canal filling in order to achieve three-dimensional obturation of the canal space. All root canal sealers are required to possess certain physical and biological properties included biocompatibility, antimicrobial effect, strength, sealing ability, adequate working and setting times, solubility, and various other characteristics for clinical use. The physical properties of four commercial root canal sealers - AH 26, Nogenol, Sealapex and Tubli-seal-were evaluated in this study. Solubility, dimensional change, fluidity and film thickness were tested according to American Dental Association Specification No. 57 for endodontic filling materials. The results were as follows : 1. Dimensional change of AH 26 was higher than specification. The other tested properties were acceptable. 2. Nogenol showed 17.8mm of fluidity and 60.6㎛ of film thickness. Solubility and dimensional change were not able to evaluate since this material does not set. It seems that this material is not suitable for multiple canal and needs higher skill of manipulation. 3. Sealapex showed suitable fluidity and film thickness. Solubility and dimensional change were not able to evaluate since this material does not set like Nogenol. 4. Tubli-seal showed good properties except solubility. In this study, all materials showed different physical properties. It is important that dentist have to understand all characteristics of paticular root canal sealing materials to achieve better result. Reevaluation of specification for root canal sealer may be recommended from the result of this study.

항공우주용 복합재튜브의 충격압궤특성에 관한 연구

김영남,최효석,기경서,김기형,양인영 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1

본 연구의 목적은 준정적 및 충격실험에 대한 CFRP 박육부재의 에너지흡수특성에 관하여 고찰하고자 한다. 준정적실험은 신강좌굴실험기를, 충격실험은 수직식 충격압궤실험장치를 사용하였으며, 총 178개의 CFRP 박육부재에 대하여 준정적 및 충격압궤실험을 수행하였다. CFRP 원형관의 압궤실험시 그 응답특성은 매우 복잡하며, 압궤과정중 상이한 역학적 상호관계에 의존하게 된다. 본 연구에서는 다양한 적층조건을 갖는 박육부재의 압궤특성과 흡수에너지에 관하여 실험후 고찰하였다. 그 결과 CFRP 박육부재의 에너지 흡수 특성은 초기결함(Trigger)과 계면수 등에 관한 다양한 함수로 나타났으며, 일반적으로 CT-타입의 CFRP 박육부재의 에너지 흡수특성이 다른 박육부재에 비해 가장 높음을 알수 있었다. The purpose of this study is to investigate on the energy absorption characteristics of CFRP (Carbon Fiber Reinforced Plastics) tubes on quasi-static and impact tests. Quasi-static and impact compression tests were performed on 178 tubes. Static compression tests have been carried out using the static testing machine(Shin-gang buckling testing machine) and impact compression tests have been carried out using the vertical crushing testing machine. When such tubes are subjected to crushing loads, the response is complex and depends on the interaction between the different mechanisms that control the crushing process. The collapse characteristics and energy absorption of a variety of tubes have been examined. The results varied significantly as a function of trigger and interlaminar number. In general, the CT-type tubes absorbed more energy than the others.