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Gelfoam이 백서악골 손상치유에 미치는 영향에 관한 연구
박창준(Chang Joon Park),윤중호(Jung Ho Yoon) 대한구강악안면외과학회 1983 대한구강악안면외과학회지 Vol.9 No.1
This study was undertaken to evaluate the effects of Gelfoam preparations on the healing process of rat s mandibular bony defects. 24 rats, sprague dawley strain, weighing about 400gm were used, devided into control group (4 rats) and experimental group (20 rats) Six rats were sacrificed every one week serially for four weeks and prepared microscopic slides with Hematoxylin-Eosin stain for pathological examination. The obtained results from this study were as follows. 1. Acute and chronic inflammatory cell infiltration was remarkable in first week control group and it showed decreasing tendency in second week control group. 2. New bone formation was found in second week control group and bony defect was filled with osseous tissue devoiding of lamella structure. 3. Inflammatory cell infiltration was obvious up to second week experimental group, foreign body reaction and necrotic bone were also observed. 4. New bone formation was noted in third week expeimental group and it showed very similar findings with control group in fourth experimental group. 5. There was no definit distinction both in control and experimental group as to periosteal bone formation. 6. There were persistant inflammatory reaction and delayed new bone formation in experimental groups compared with control groups by fourth weeks. Healing process was essentially the same in all groups.
수소화물 발생-유도결합플라스마 질량분석법에 의한 철강 중의 납의 정량
박창준,송선진,이동수,Park, Chang Joon,Song, Sun Jin,Lee, Dong Soo 한국분석과학회 2001 분석과학 Vol.14 No.5
철강 시료 중의 납 분석을 위하여 수소화물 발생법을 플라스마에 납을 선택적으로 주입하고 유도결합플라스마 질량분석법으로 측정하는 분석법을 개발하였다. 납 수소화물 $PbH_4$의 생성을 위해서는 $NaBH_4$와 반응 전에 먼저 준안정 상태의 Pb(IV)로 만들어주기 위하여 산화제가 필요하다. $1000{\mu}g/mL$ 이상의 철 매질을 함유하는 시료용액으로 납 수소화물을 발생시키기 위한 최적조건을 찾는 연구를 수행하였다. 철 매질이 $10{\mu}g/mL$ 이상 존재할 때는 $K_2Cr_2O_7$이 효과적인 산화제로 작용하였으며 젖산을 가하여 감도를 향상시켰다. 시료용액의 산농도 그리고 산화제와 젖산 농도의 최적값은 철 매질의 농도에 따라 달랐다. 동위원소 희석법을 사용하여 납을 정량하였으며 철강 표준물질 NIST SRM 361, 362 분석결과는 불확도 범위안에서 검정값과 잘 일치하였다. An analytical method has been developed which determines lead in steel samples by inductively coupled plasma mass spectrometry (ICP-MS) with sample introduction by the hydride generation. The lead hydride is not stable and requires and oxidant for the oxidation into metastable Pb(IV) before reduction to $PbH_4$ with $NaBH_4$. A study was carried out to find and optimum lead hydride generation condition for a sample solution with more than $1000{\mu}g/mL$ Fe matrix. $K_2Cr_2O_7$ was found to work as an efficient oxidant when more than $10{\mu}g/mL$ Fe matrix was present. Lactic acid was used with the oxidant as a complexing agent of the metastable Pb(IV) to enhance sensitivity. Optimum concentrations of the sample acidity, oxidant and lactic acid were different depending on the matrix concentration. The isotope dilution method was employed for the quantitation of lead. The determined Pb concentrations of the NIST steel SRM 361 and 362 were in good agreement with the certified values within the uncertainty range.
동위원소희석 질량분석법에 의한 1000 ㎍/g 염소 표준용액 중 브롬 불순물 분석
박창준,서정기,송현주,이동수,Park, Chang Joon,Suh, Jung Kee,Song, Hyun Joo,Lee, Dong Soo 한국분석과학회 2006 분석과학 Vol.19 No.1
The isotope dilution method was used for the determination of Br impurity in $1000{\mu}g/g$ Cl standard solution. Since relatively pure KCl salt was used for the preparation of the Cl standard solution, the Br impurity determination suffers from both spectral and non-spectral interferences due to the presence of a large amount of K and Cl matrices. AG2-X8 anion-exchange resin was employed to separate the Br analyte from the matrices, and RF power was raised to 1500 W and nebulizer gas flow rate was lowered to 0.77 L/min to reduce background from the $ArArH^+$ molecular ions. The Br impurity in the $1000{\mu}g/g$ Cl standard solution was determined to be 43.7 ng/g with the standard addition method. The analytical result was in good agreement with 41.2 ng/g (RSD 1.6%) determined by the isotope dilution method to lower uncertainty from poor reproducibility of the anion-exchange process.
ICP-MS에 의한 생체시료 중의 극미량 금속오염도 측정
박창준,이상호,정구순,이광우,Park, Chang-Joon,Lee, Sang-Ho,Chung, Koo-Soon,Lee, Kwang-Woo 대한화학회 1993 대한화학회지 Vol.37 No.9
정도관리용 생체기준물질 중의 극미량원소에 대한 분석법을 확립하였다. 생체시료를 질산-과산화수소 혼합산화제와 함께 테플론 가압분해용기에 넣어 마이크로파 오븐에서 분해하는 시료전처리법(microwave digestion)을 사용하였다. 시료를 분해시키기 전에 정량할 극미량금속의 안정 동위원소를 첨가하여 동위원소희석 질량분석법을 적용하였다. 혈액과 소나무잎 기준물질에 이러한 분석방법을 적용하여 기준값과 일치되는 결과를 얻었다. An analytical method has been developed to determine trace elements in biological samples. The biological samples are added to a laboratory-bulit Teflon bomb together with nitric acid-hydrogen peroxide mixture and enriched stable isotopes. The samples are decomposed in a microwave oven. The decomposed sample solutions are analyzed by isotope dilution inductively coupled plasma mass spectrometry. The analytical results of the biological samples agree well with the reference values.
게임용 동작 인터페이스를 위한 블롭 특징 기반 마커프리 모션캡쳐 시스템
박창준(Chang Joon Park),김성은(Sung Eun Kim),이인호(In Ho Lee) 한국컴퓨터게임학회 2004 한국컴퓨터게임학회논문지 Vol.4 No.-
본 논문에서는 사용자 직접 참여형 게임의 동작 인터페이스를 위한 실시간 마커프리 모션캡쳐 시스템 MIMIC(motion interface & motion information capture)을 제안한다. 2대의 동기화된 카메라에서 캡쳐되는 영상에서 컬러와 형태 특징 모델을 이용하여 인체의 루트 (root)와 머리, 손, 발과 같은 끝점 (end-effectors)들을 검출한다. 그리고, 칼만 필터 (Kalman filter)를 이용하여 검출된 루트와 끝점들을 추적하고, 보정된 카메라 위치로부터 3차원 좌표를 복원한다. 그리고, 팔꿈치와 무릎과 같은 중간관절 위치는 해부학적 제한 조건이 가해진 역운동학 해석에 의해 추정함으로 3차원 인체 동작을 실시간으로 복원한다. 일반적인 조명 환경에서 MIMIC 시스템을 구현해 본 결과, 다양한 3차원 인체동작을 실시간으로 복원할 수 있었다.