BaFBr:Eu²+,Na+ 영상판 제작과 특성

김찬중,김성환,이병화,김완,강희동,김도성,서효진,도시홍 경북대학교 센서기술연구소 2002 센서技術學術大會論文集 Vol.13 No.1

경도 및 중등도 본태성 고혈압환자에서 Amlodipine단독요법

안기완,서영환,김상도,박윤환,김철,조경상,김완중,홍순표 최신의학사 1992 最新醫學 Vol.35 No.9

불응성 자가면역질환에서의 자가조혈모세포이식

민도준,양동원,민창기,김완욱,이상헌,박성환,김동욱,이종욱,조철수,민우성,김범생,김호연,김춘추 대한조혈모세포이식학회 2001 대한조혈모세포이식학회지 Vol.6 No.1

배경: 기존의 치료에 불응하고 예후가 불량한 자가면역질환 환자들에게 최근 고용량 면역억제 및 조혈모 세포이식이 새로운 치료방법으로 대두되고 있다. 저자들은 다발성 경화증(multiple sclerosis, MS) 및 류마티스 관절염(rheumatoid arthritis, RA) 등 2명의 자가면역질환 환자들에서 자가조혈모세포 이식을 시행하였다. 방법: 말초혈액 조혈모세포 가동화를 위하여 cyclophosphamide (4 g/㎡) 및 granulocyte colony stimulating factor (10 g/kg/day)를 투여하였고, CD34+ 세포를 분리·채집 하였다, 이식 전처치로 MS 환자에서 BEAM 및 antihymocyte globulin (ATG) (3.75 mg/kg), RA 환자에서 fludarabine (180 mg/㎡), ATG (10 mg/kg)와 busulfan (8 mg/kg)을 투여하였다. 결과: 호중구 수가 500/㎕ 이상으로 회복되는 기간은 MS 환자에서 9일, RA 환자에서 15일이었다. 혈소판이 20.000/㎕ 이상으로 회복되는 가간은 RA 환자에서 9일 이었고, MS 환자에서는 혈소판 감소증이 발생하지 않았다. 비혈액학적 독성으로 MS 환자에서 WHO 1도의 오심 및 점막염이 관찰되었다. MS 환자는 이식 6개월 후까지 시력감소가 남아있었으나, 이식전에 관찰되던 감각이상 및 운동장애 등의 신경학적 이상 소견은 더 이상 관찰되지 않았다. RA 환자는 이식 1개월 후 관절 증상 및 검사소견의 호전을 보였다. 결론: 불응성 자가면역질환 환자에서 고용량 면역억제 및 조혈모세포이식은 적은 독성으로 높은 치료효과를 기대할수 있으며, 향후 이 시술의 임상적 의의를 규명하기 위하여 전향적이고 장기적인 연구가 필요할 것으로 사료된다. Background: High-dose immunosuppressive therapy followed by autologous hemathpoietic stem cell transplantation (HSCT) has been proposed as a new approach to treat severe, refractory autoimmune diseases. We describe two patients with refractory autoimmune diseases (one multiple sclerosis 〔MS〕and one rheumatoid arthritis〔RA〕) who underwent T-cell-depleted autologous peripheral bleed stem cell transplantation for the first time in Korea. Methods: We mobilized autologous stem cells with cyclophisphamide (4 g/㎡) and granulocyte colony-stimulating factor (10 ㎍/kg/day). Stem cells were enriched ex vivo using CD34-positive immunoselection and reinfused after high-dose chemotherapy with BEAM and antithymocyte globulin (ATG) (3.75 mg/kg) in MS, or fludarabine (180 mg/㎡), ATG (10 mg/kg) and busulfan (8 mg/kg) in RA. Results: The engraftment with an absolute nerutrophil count greater than 500㎕ occurred on day 9 in MS and 15 in RA, respectively. The time to nontransfused platelet count greater than 2.000/㎕ was 9 day in RA. MS patient did not show ant episode of thrombocytopenia. Regimen-related non-hematopoietic toxicity was minimal. For 6 months since HSCT, them patient with MS had been free from previously existed sensory and motor abnormalities except decreased visual acuity. Then patient with RA and only one tender joint and two mildly swollen joints with improvement in laboratory parameters at one month after HSCT. Conclusion: These results underscore the feasibility and potential efficacy of intensive immunosuppression followed by autologous HSCT for treatment of intractable autoimmune diseases. The durability of remission, however, remains to be clarified.

SrCI_2:Eu^2+ 형광체의 광발광 및 광자극발광 특성

도시홍,서효진,김영국,김도성,김성환,김찬중,이병화,김완,강희동 한국센서학회 2002 센서학회지 Vol.11 No.6

고상반응법으로 SrCl_2:Eu^2+ 형광체를 제작하고, 제작한 형광체의 광자극발광과 광발광 특성을 조사하였다. SrCl_2:Eu^2+ 형광체와 광발광 및 광자극발광은 Eu^2+ 의 5d->4f 천이에 기인되었으며, 355 nm의 광으로 여기시켰을 때 광자극발광과 광발광 스펙트럼의 파장범위는 모두 380~440nm이었고, 피이크 파장은 407nm이었다. SrCl_2:Eu^2+형광체의 선량의존성은 2.5 mGy~200mGy영역에서 우수한 선형성을 나타내었으며, 상온에서 광자극발광의 fading은 20분에 60%이었다. SrCl_2:Eu^2+ phosphors were prepared by the solid phase reaction method, and their photostimulated luminescence(PSL) and photoluminescence(PL) characteristics were investigated. The PSL and PL peak of the SrCl_2:Eu^2+ phosphors are due to the 5d->4f transition of Eu^2+ ions in phosphors. The PSL and PL spectrum obtained by the 355 nm exitation was observed in 380~440 nm region with the peak at 407 nm. The dose response of the PSL phosphors were linear within 2.5 mGy ~ 200 mGy of 100kV X-ray. The fading of the phosphors at room temperature was approximately 60% after 20 min.

BaFBr:Eu^2+ 형광체의 열발광 및 광자극발광 특성

도시홍,서효진,강갑중,김영국,김도성,김성환,김찬중,이병화,김완,강희동 한국센서학회 2002 센서학회지 Vol.11 No.5

BaFBr:Eu^2+ 형광체를 제조하고, 이 형광체의 열발광 특성과 광자극발광 특성을 조사하였다. 이 형광체의 열발광 g1ow 피이크 온도는 352K와 448K였으며, 주 피이크(352K)에 관여하는 트랩의 활성화에너지는 약 0.96eV이었다. 또한 이 형광체의 광자극발광 스펙트럼의 파장범위는 350~450nm 사이였으며, 광자극발광에 기여하는 트랩의 활성화에너지는 약 0.98eV이었다. 열발광트랩과 광자극발광 트랩의 활성화에너지는 실험오차 내에서 일치하였다. BaFBr:Eu^2+ phosphors were prepared, and the thermoluminescence(TL) and photostimulatedluminescence(PSL) of the prepared phosphors were measured. Two glow peaks around 352 and 448 K are observed for x-ray irradiated BaFBr:Eu^2+ phosphors, and the activation energy of the main glow peak(352 K) was about 0.96 eV. The spectral range of the PSL was 350 ~450 nm, and the activation energy of the trap giving rise to PSL was about 0.98 eV. The activation energy of the traps giving rise to TL is agreed to those giving rise to PSL within experimental error.

재생골재 콘크리트 보강블록을 이용한 증설벽의 구조성능

김선우,이갑원,박완신,한병찬,최창식,윤현도 대한건축학회 2004 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.24 No.1(구조계)

The use of recycled aggregate concrete is increasing faster than the development of appropriate design recommendations. Also noises and shocks caused remodeling and reinforcement work do harm to residents. This paper reports limited experimental data on the structural performance of shear wall used concrete blocks made in recycled aggregates. Reinforced concrete frame and shear wall were tested to determine their diagonal cracking and ultimate shear behavior. The variable in the test program was the existence of infilled wall used concrete blocks Made in recycled aggregates. Based on the experimental results, Infilled wall has a high influence on the maximum strength and initial stiffness of reinforced concrete frame. Structural performance of specimen WSB is quite different from RCF specimen, particularly strength, stiffness and energy dissipation capacity.

자가부식형 상아질접착제와 레진시멘트와의 적합성에 관한 연구

김도완,박상진,최경규 大韓齒科保存學會 2005 Restorative Dentistry & Endodontics Vol.30 No.6

본 연구는 상아질 접착제와 레진 시멘트의 적합성 여부를 알아보고자 시행하였다. 발거한 제3대구치의 상아질 표면을 노출시킨 후 Tescera ATL 복합레진 시편을 상아질 접착제 [All Bond 2 (Bisco), Clearfil SE Bond (Kuraray), Adper Prompt L-POP (3M), One-Up Bond F (Tokuyama)]와 레진시멘트 [Choice (Bisco), Panavia F (Kuraray), RelyX ARC (3M), Bistite II DC (Tokuyama)]로 접착하고 미세인장 결합강도 및 주사전자 현미경 관찰을 시행한 결론은 다음과 같다. 1. Clearfil SE Bond와 All-Bond 2가 Prompt L-Pop과 One-Up Bond F 보다 높은 미세인장 결합강도를 보였다(p < 0.05). 2. Clearfil SE Bond와 All-Bond2 사용시 1-step 상아질 접착제보다 혼성층이 두껍고 레진 tag가 길었다. This study was performed to investigate the compatibility between 4 dentin adhesives and 4 resin luting cements. Dentin adhesives used in this study were All-Bond 2 (Bisco Inc., Schaumbrug, IL, USA), Clearfil SE-Bond (Kuraray Medical Inc, Osaka, Japan), Prompt L-Pop (3M Dental Products, St. Paul, MN, USA), One-Up Bond F (Tokuyama corp., Tokyo, Japan). Resin luting cements used in this study were Choice (Bisco Inc., Schaumbrug, IL, USA), Panavia F (Kuraray Medical Inc, Osaka, Japan), RelyX ARC (3M Dental Products, St. Paul, MN, USA), Bistite II DC (Tokuyama corp., Tokyo, Japan). Combination of each dentin adhesive and corresponding resin cement was made to 16 experimental groups. Flat dentin surfaces was created on mid-coronal dentin of extracted mandibular third molars, then dentin surface was polished with 320-grit silicon carbide abrasive papers. Indirect resin composite block (Tescera, Bisco) was fabricated. Its surface for bonding to tooth was polished with silicon carbide abrasive papers. Each dentin adhesive was treated on tooth surface and resin composite overlay were luted with each resin cement. Each bonded specimen was poured in epoxy resin and sectioned occluso-gingivally into 1.0 ㎜ thick slab, then further sectioned into 1.0 × 1.0 ㎟ composite-dentin beams. Microtensile bond strength was tested at a crosshead speed of 1.0 ㎜/min. The data were analysed by one-way ANOVA and Duncan's multiple comparison tests. The results of this study were as follows; 2-step self-etching dentin adhesive which has additional bonding resin is more compatible than 1-step self-etching dentin adhesive.

고반복 펄스형 CO₂ 레이저 전원장치의 개발

김희제,정현주,김도완,이동훈 釜山大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.57 No.-

본 연구에서는 1㎑ 부근의 펄스 반복율을 가지는 경제적이고 컴팩트한 펄스형 CO₂레이저의 동작 특성에 관해서 기술하였다. 고압·고주파 펄스 변압기와 수 십 ㎑의 스위칭에 적합한 IGBT를 사용한 고압 펄스전원 장치를 레이저 공진기에 접목시켜 새로운 방식의 고반복 CO₂레이저 전원장치를 개발하였다. 공진기는 수냉방식의 저속축류형으로 제작되었고 제어부에는 전원장치에 사용된 2개의 IGBT를 정밀하게 제어하기 위해서 PIC 마이크로프로세서가 사용되었다. 완성된 장치의 펄스 반복율과 동작압력 그리고 레이저 매질 가스의 혼합비의 변화에 따른 레이저빔의 출력 특성실험을 통하여 가스 배압비 CO₂: N₂: He = 1 : 9 : 15, 펄스 반복율 700 ㎐, 동작압력 15 Torr에서 최대 레이저 출력 약 20.5W, 최대 효율 약 8 %였다. In this study, we aim to develope a cheap and compact pulsed CO₂laser with pulse repetition rate range of 1 ㎑. We used a IGBT as the switching element of a power supply, which is cheap and simple comparing to others. PIC one-chip microprocessor was used for precise. control of a laser power supply on the control part. And the laser cavity was fabricated as an axial and water cooled type. The laser performance characteristics as various parameters, such as pulse repetition rate, gas pressure, and gas mixture rate have been investigated. The experiment was done under the condition of three gas mixture rates of CO₂: N₂: He = 1 : 3 : 10, 1 : 1.5 : 5, and 1 : 9 : 15. For this experiment, working pressure was from 6 Torr to 15 Torr and pulse repetition rate from 100 ㎐ to 900 ㎐. As a result, the maximum average output was about 20.5 W at the working pressure of 15 Torr, the gas mixture CO₂: N₂: He = 1 : 9 : 15 and the pulse repetition rate of 700 ㎐.

축구 로봇의 전략 알고리즘 개선

김재헌,이대훈,이성민,최환도,김중완 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

This paper presents an strategy algorithm of a soccer robot. We simply classified strategy of soccer robot as attack and defense. We use DC-motor in our Soccer Robot. We use the vision system made by MIRO team of Kaist and Soty team for image processing. Host computer is made by Pentium III. The RF module is used for the communication between each robot and the host computer. Fuzzy logic is applied to the path planning of our robot. We improve strategy algorithm of soccer robot. Here we explain improvement of strategy algorithm and fault of the our soccer robot system.

철근콘크리트 장방형 전단벽의 비선형 유한요소 해석

윤현도,한민기,김선우,박완신,양일승,한병찬 대한건축학회 2005 大韓建築學會論文集 : 構造系 Vol.21 No.2

The major objective of the present study is to conduct parametric study and to propose a finite element analysis(FEA) technique of the reinforced concrete rectangular shear walls using ABAQUS under constant axial and monotonic lateral load. A FEA of the reinforced concrete walls are different to aspect ratio and a detailed finite element models are created to study the post-cracked mode of failure in plastic region of the walls. The proposed models account for the effect of material inelasticity, concrete cracking, and geometric nonlinearity. The prossed FEA model is verified by Lefas's benchmark data and validated through comparisons with experiment result of reinforced concrete shear walls. Finally, the study considered various parameters and compared with ACI 318-02 to confirm accuracy of this study: aspect ratio, axial force ratio, vertical and horizontal reinforcement ratio.