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Tb<SUB>3-x</SUB>Bi<SUB>x</SUB>Fe₅O₁₂(x = 0.5, 0.75, 1.0, 1.25)의 자기적 특성 연구
박일진(Il Jin Park),김철성(Chul Sung Kim) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.5
Tb<SUB>3?x</SUB>Bi<SUB>x</SUB>Fe?O₁₂ has been studied by x-ray diffraction (XRD), vibrating sample magnetometer, Mossbauer spectroscopy. The crystal structures were found to be a cubic garnet structure with space group Ia3d. The lattice constants increase linearly with increasing bismuth concentration. With increase of bismuth substitution, the Neel temperature increases but the compensation temperature decreases. We have observed the negative magnetization in Bi-TbIG system which has not been reported in garnet systems. Mossbauer spectra were measured at various temperatures from 4.2 K to Neel temperature. The isomer shifts at room temperature are ~0.26 ㎜/s which is consistent with ferric state.
Tb₂Bi₁Ga<SUB>x</SUB>Fe<SUB>5−x</SUB>O<SUB>12</SUB>(x = 0, 1)의 뫼스바우어 분광연구
박일진(Il Jin Park),김철성(Chul Sung Kim) 한국자기학회 2008 韓國磁氣學會誌 Vol.18 No.2
Tb₂Bi₁GaxFe<SUB>5?x</SUB>O<SUB>12</SUB> (x = 0, 1) fabricated by sol-gel and vacuum sealed annealing process. Tb₂Bi₁GaxFe<SUB>5?x</SUB>O<SUB>12</SUB> (x = 0, 1) have been studied by x-ray diffraction(XRD), vibrating sample magnetometer, and Mossbauer spectroscopy. The crystal structures were found to be a cubic garnet structure with space group Ia3d. The determined lattice constants a? of x = 0, and 1 are 12.497 A, and 12.465 A, respectively. The distribution of gallium and iron in Tb₂Bi₁GaxFe<SUB>5?x</SUB>O<SUB>12</SUB> is studied by Rietveld refinement. Based on Rietveld refinement results, the terbium and bismuth ions occupy the 24c site, iron ions occupy the 24d, 16a site, and nonmagmetic gallium ions occupy the 16a site. In order to verify the magnetic site occupancy of iron and gallium, we have taken Mossbauer spectra for Tb₂Bi₁GaxFe<SUB>5?x</SUB>O<SUB>12</SUB> (x = 0, 1) at room temperature. From the results of Mossbauer spectra analysis, the absorption area ratios of Fe ions for Tb₂Bi₁Fe?O<SUB>12</SUB> on 24d and 16a sites are 60.8 % and 39.2 %, respectively, and the absorption area ratios of Fe ions for Tb₂Bi₁Ga₁Fe₄O<SUB>12</SUB> on 24d and 16a sites are 74.7% and 25.3%, respectively. It is noticeable that all of the nonmagnetic Ga atoms occupy the 16a site by vacuum annealing process.
박일진 ( Il-jin Park ),구태완 ( Tae-wan Gu ),박경국 ( Kyung-kook Park ),정연진 ( Yeon-jin Jung ),이광모 ( Kwang-mo Lee ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.2
현재 시맨틱 웹에 존재하는 동일 도메인에서 2 개 이상의 온톨로지가 존재할 때, 동일한 의미에 대하여 모든 온톨로지들을 통합한다는 것은 실질적으로 불가능하다. 그래서 본 논문에서는 각 온톨로지로부터 메타정보를 수집하여 시맨틱 저장소에 저장한다. 시맨틱 저장소에서는 동치와 유사성을 가진 요소들로 그룹을 생성하게 되는데, 이때 각 온톨로지에서 추출한 메타정보에 대해서 동치인 요소에 대해서는 동일한 그룹으로 통합하고, 그렇지 않은 요소에 대해서는 구분된 그룹으로 구성하도록 한다. 동일한 그룹 내의 요소는 각 요소들을 포함하고 있는 온톨로지의 URI 를 가지게 된다. 그러므로 사용자들은 모든 온톨로지를 검색하지 않고 그룹 내에 존재하는 요소에 대해서만 검색을 수행하며, 각 온톨로지의 특성에 무관하게 동일한 방법(interface)를 이용하여 모든 대상 온톨로지 개체의 URI 를 획득 할 수 있게 된다.
주관식,박일진,김종호,남기용,백승화,Ju, Gwan-Sik,Park, Il-Jin,Kim, Jong-Ho,Nam, Gi-Yong,Baek, Seung-Hwa 대한의용생체공학회 1997 의공학회지 Vol.18 No.3
3.6cm${\times}$2.0cm (지름 ${\times}$ 두께) 크기의 $BaF^2$ 섬광체로 검출기를 제작하여 감마 카메라등 의료용 진단장치에서 센서로 사용되고 있는 NaI(씨)검출기와 방사선 검출특성을 비교하여 보았다. 특정에 사용된 선원은 $^{22}Na,\;^{54}Mn,\;^{57}Co,\;^{137}Cs$의 ${\gamma}$선 방출선원으로 검출기와 선원간의 거리를 7cm로 유지하였다. 시간특성을 분석하기 위하여 511keV의 양전자 방출선원을 사용하여 NaI(Tl)(1" ${\times}$ 1"), NaI(Tl)(3" ${\times}$ 3")순으로 $BaF^2$가 가장 빠르게 나타났으며, $BaF^2$ 검출기의 효율은 500keV에서 가장 높게 측정되었다. he scintillation detector having $BaF^2$ crystal with 3.6cm dia${\times}$2.0 cm thick was provided. The energy and timing characteristics were measured and compared with NaI(Tl) scintillation detectors, which widely used in unclear medicine. In order to measure the energy spectrum, the radioactive sources used were $^{22}Na,\;^{54}Mn,\;^{57}Co,\;^{137}Cs$ and the source to detector distance was 7cm. For the timing characteristic, NaI(Tl)(1" ${\times}$ 1")-$BaF^2$ and NaI(Tl)(3" ${\times}$ 3")-$BaF^2$ timing coincidence systems were prepared and the used source was $^{22}Na$ emitting 511keV annihilation photons. For the 511keV gamma-ray emitted from $^{22}Na$, It was revealed that the timing response of the $BaF^2$ detector was faster than NaI(Tl)(1" ${\times}$ 1") and NaI(Tl)(3" ${\times}$ 3") detector used in this experimental investigation. The energy characteristics of the $BaF^2$ detector had a good values for about 500keV energy range.
Artificial Bilirubin Standard를 이용한 혈청 Bilirubin 정량법의 검토
김태운 ( Tae Woon Kim ),윤균 ( Kyun Yoon ),박일진 ( Il Jin Park ) 대한임상검사과학회 1984 대한임상검사과학회지(KJCLS) Vol.16 No.1
Bilirubin in serum exists in two forms; one relatively water soluble, reacts readi1 y in aqueous solution called direct bilirubin or conjugated bilirubin. The other form reacts very slowly unless a solubilizing agent is used and is termed as indirect or unconjugated bilirubin. The ratio of conjugated to unconjugated bilirubin may vary in different types of liver diseases. Most methods for the determination of bilirubin are based on the diazo reaction in which azobil-irubin is formed. The Evelyn-Malloy method, which is widely used, has been almost standard method. Direct bilirubin is determined by photometric measurement of the color developed exactly one minute after diazotization. Methanol is then added which releases indirect bilirubin into solution permitting it to undergo diazotization. The final color developed represents total bilirubin. Bilirubin (Bilirubin standard) is stable for approximately 24 to 48 hours at room temperature if kept in total darkness. When exposed to white light, either sunlight or artificial, direct and indirect bilirubin undergo photo-oxidation or dehydrogenation to biliverdin some itermidiate product. So we attempt to introduce and establish more stable bilirubin determination method using a artificial bi1irubin standard (Pontacyl viloet 6R solution).
주관식,박일진,김종호,남기용 명지대학교 자연과학연구소 1996 자연과학논문집 Vol.14 No.-
핵의학 분야에서 최근 많이 사용되고 있는 BGO 검출기를 제작하고, 에너지 특성을 상용의 NaI검출기와 비교하여 보았다. 에너지 측정에 사용된 선원은 ??Na, ???Mn, ??Co,??Cs이며, 이들의 에저지의 영역은 500~1400 keV이다. 실험결과, 효율은 BGO검출기기보다 511 keV에서 2.8배 좋은 것으로 나타났고 반면 에너지 분해능은 떨어졌다. The BGO scintillation detector widely used in nuclear medicine was constructed. The energy characteristics of the BGO detector was measured and compared with that of NaI(Tl)detector. The radioactive sources used were ??Na , ??Mn, ??Co and ??Cs. There energy range was 500~1400 keV. For the 511 keV, the detection efficiency of the BGO detector was about 2.8 times better than Nal(Tl). In other hand the energy resolution was not better.