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이진규,김택수,Lee, Jin-Kyu,Kim, Taek-Soo 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6
The Cu-based bulk metallic glass (BMG) composite was fabricated by spark plasma sintering (SPS) using of gas-atomized metallic glass powders and ductile brass powders. No defect such as pores and cavities was observed at the interface between the brass powder and the metallic glass matrix, suggesting that the SPS process caused a severe viscous flow of the metallic glass and brass phases in the supercooled liquid region, resulting in a full densification. The BMG composites shows some macroscopic plasticity after yielding, although the levels of strength decreased.
기계적 밀링 및 방전 플라즈마 소결 공정을 이용한 벌크 비정질 복합재의 제조
이진규,김택수,김정곤,Lee, Jin-Kyu,Kim, Taek-Soo,Kim, Jeong-Gon 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.3
Bulk metallic glass (BMG) composite was fabricated by consolidation of milled metallic glass composite powders. The metallic glass composite powder was synthesized by a controlled milling process using the Cu-based metallic glass powder blended with 30 vol% Zr-based metallic glass powders. The milled composite powders showed a layered structure with three metallic phases, which is formed as a result of mechanical milling. By spark plasma sintering of milled metallic glass powders in the supercooled liquid region, a fully dense BMG composite was successfully synthesized.
Purification of Human Interferon-${\beta}$ from Recombinant E. coli
이진규,이석재,최문기,정광회,신광순,백승복,Lee, Jin-Kyu,Lee, Seok-Jae,Choe, Moon-Kee,Chung, Kwang-Hoe,Shin, Kwang-Soon,Paik, Sung-Bok 생화학분자생물학회 1990 한국생화학회지 Vol.23 No.2
유전자 재조합 인간 Interferon-${\beta}$를 초음파 처리, 8 M Guanidine-HCl 추출, inclusion body의 용해, 희석, Blue Sepharose CL-6B column chromatography, HPLC gel filtration 방법 등을 이용하여 대장균으로부터 정제하였다. 정제된 IFN-${\beta}$의 specific activity는 $3.1{\times}10^8$ IU/mg이었고 정제도는 1,902이었다. 정제된 IFN-${\beta}$는 환원된 상태와 환원되지 않은 상태에서 SDS polyacrylamide gel electrophoresis 한 결과 모두 단일 띠로 나타났으며 분자량은 18,000 dalton이었다. N-말단 아미노산을 조사한 결과 재조합 인간 IFN-${\beta}$는 천연형 인간IFN-${\beta}$와 같이 N-말단이 methionine임이 밝혀졌다. 전자 현미경을 이용하여 inclusion body 형성을 조사한 결과 IFN-${\beta}$ 유전자를 가지고 있는 대장균에서는 inclusion body의 형성을 확인할 수 있었으나 숙주(wild type)에서는 확인되지 않았다. 최종적으로 정제된 IFN-${\beta}$의 정제도는 HPLC gel filtration 한 결과 99% 이상으로 나타났다. Recombinant human interferon-${\beta}$ was purified to homogeneity from E. coli by methods of sonication, extraction with 8 M Guanidine HCl, solubilization of inclusion body, dilution, Blue Sepharose CL-6B column chromatography and HPLC gel filtration. Specific activity of purified IFN-${\beta}$ was $3.1{\times}10^8$ IU/mg protein and the purification was 1,902 fold. The purified IFN-${\beta}$ was a single band on SDS polyacrylamide gel electrophoresis under reducing condition and non-reducing condition and its molecular weight was estimated to 18,000 dalton. The results of N-terminal analysis showed that recombinant human IFN-${\beta}$ has N-terminal methionine same as natural human IFN-${\beta}$. The inclusion bodies were observed in the E. coli cells harboring IFN-${\beta}$ gene but not observed in the host cells (MM 294). The purity of finally purified IFN-${\beta}$ was more than 99% by HPLC gel filtration.
이진규,Lee, Jin-Kyu 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.4
The Ni-based bulk metallic glass matrix composites were fabricated by spark plasma sintering of mixture of gas-atomized metallic glass powders and ductile brass powders. The successful consolidation of metallic glass matrix composite was achieved by strong bonding between metallic glass powders due to viscous flow deformation and lower stress of ductile brass powders in the supercooled liquid state during spark plasma sintering. The composite shows some macroscopic plasticity after yielding, which was obtained by introducing a ductile second brass phase in the Ni-based metallic glass matrix.
방전플라즈마 소결법에 의한 비정질/비정질 복합재의 제조
이진규,Lee, Jin-Kyu 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.6
The Cu-based bulk metallic glass (BMG) composites containing Zr-based metallic glass phase have been consolidated by spark plasma sintering using the mixture of Cu-based and Zr-based metallic glass powders in their overlapped supercooled liquid region. The Zr-based metallic glass phases are well distributed homogeneously in the Cu-based metallic glass matrix after consolidation process. The successful consolidation of BMG composites with dual amorphous phases was corresponding to the sound viscous flow of the two kinds of metallic glass powders in their overlapped supercooled liquid region.
유전자 재조합 대장균으로부터 인간 Interferon - α2 의 정제
이진규,강인철,박성희,정광희,문홍모 ( Jin Kyu Lee,In Chul Kang,Sung Hee Park,Kwang Hoe Chung,Hong Mo Moon ) 생화학분자생물학회 1992 BMB Reports Vol.25 No.1
Recombinant human IFN-α2 was purified from E. coli by methods involving sonication, extraction with 8 M Guanidine-HCI, dilution, CuSO₄ fractionation, copper-chelating column chromatography, S-Sepharose column chromatography. Specific activity of purified IFN-α2 was 1.6 × 10^9 IU/㎎ protein and the degree of purification was 94 fold from the starting material. Purified IFN-α2 was formed a single band on SDS-PAGE under reducing condition and also on non-reducing condition. Its molecular weight was estimated to be 18,000 dalton and the isoelectric point of purified IFN-α2 was 6.0. Purity of the recombinant IFN-α2 was better than 99% by densitometric analysis of SDS-PAGE.
랜덤 포레스트를 이용한 감정인식 결과를 바탕으로 스마트폰 중독군 검출
이진규,강현우,강행봉,Lee, Jin-Kyu,Kang, Hyeon-Woo,Kang, Hang-Bong 한국전기전자학회 2015 전기전자학회논문지 Vol.19 No.2
최근 기술의 발달로 국내에 10명 중 8명은 스마트폰을 사용하고 있다. 또한, 스마트폰을 이용한 다양한 어플리케이션들이 개발되었다. 이로 인해, 스마트폰 중독현상이 사회적인 문제로 대두되고 있다. 특히, 스마트폰 중독은 스스로가 조절하기 어렵고, 자각하기 힘들다. 주로 설문지를 중심으로한 연구들에서, 스마트폰 중독을 진단하기 위해 예를 들면 S-척도와 같은 연구를 수행해왔다. 본 연구에서는 ECG(심전도)와 Eye Gaze 신호를 이용한 검출 방법을 제안하고자 한다. 피험자가 감정 영상을 시청했을 때, 피험자의 ECG 신호와 Eye Gaze 신호를 각각 Shimmer와 스마트아이를 이용하여 측정한다. 더불어, ECG 신호의 S-transform 결과를 특징으로 추출한다. 또한 동공의 직경, 시선과의 거리, 눈 깜빡임으로 구성된 Eye Gaze 신호로부터 12개의 특징을 추출한다. 분류기는 랜덤 포레스트를 이용하여 학습시키고 피험자의 데이터를 이용하여 스마트폰 중독군을 검출한다. 검출한 결과와 실험 전 진행한 S-척도 결과와 비교한 결과 ECG는 87.89%의 정확도, Eye Gaze는 60.25%의 정확도를 보여주는 것을 알 수 있었다. Recently, eight out of ten people have smartphone in Korea. Also, many applications of smartphone have increased. So, smartphone addiction has become a social issue. Especially, many people in smartphone addiction can't control themselves. Sometimes they don't realize that they are smartphone addiction. Many studies, mostly surveys, have been conducted to diagnose smartphone addiction, e.g. S-measure. In this paper, we suggest how to detect smartphone addiction based on ECG and Eye Gaze. We measure the signals of ECG from the Shimmer and the signals of Eye Gaze from the smart eye when the subjects see the emotional video. In addition, we extract features from the S-transform of ECG. Using Eye Gaze signals(pupil diameter, Gaze distance, Eye blinking), we extract 12 features. The classifier is trained using Random Forest. The classifiers detect the smartphone addiction using the ECG and Eye Gaze signals. We compared the detection results with S-measure results that surveyed before test. It showed 87.89% accuracy in ECG and 60.25% accuracy in Eye Gaze.
유전자 재조합 대장균으로부터 인간 Interferon - β
이진규,이석재,최문기,정광희,신광순,백승복 ( Jin Kyu Lee,Jae Lee,Moon Kee Choe,Kwang Hoe Chung,Kwang Soon Shin,Sung Bok Paik ) 생화학분자생물학회 1990 BMB Reports Vol.23 No.2
Glutathione S-transferase ρ (EC 2.5.1.18) has been purified to homogeneity from human erythrocytes. A combination of gel filtration, ion exchange and hydroxylapatite chromatographic procedure yields the specific activity of 20.8 units/㎎. The purified enzyme gives a single band corresponding to 24,000 M.W. on a sodium dodecyl sulfate polyacrylamide gel electrophoresis. The enzyme molecule is characterized to be an acidic protein (pI 4.6) having a dimeric structure with 48,000 M.W. composed of identical size of polypeptide chains. Apparent K_m and V_(max) were determined to be 1.1 mM and 1.0 mmol/1/min for 1-chloro-2,4-dinitro benzene respectively while 0.3 mM and 0.55 mmol/l/min for glutathione. Results obtained from chemical modification studies suggest that essential amino group(s) critically connected to the catalytic function of glutathione S-transferaseρ.