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Bahk, Yeon-Kyoung,Kim, Hyung-Hoon,Park, Deog-Su,Chang, Seung-Cheol,Go, Jeung-Sang Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.12
This study introduces a new concept for a simple, efficient and cheap sensitivity amplification of a Quartz Crystal Microbalance (QCM) based immunosensor system for the detection of tumor necrosis factor-alpha (TNF-${\alpha}$, TNF) by using an in-built magnetic system. The frequency shift due to the applied magnetic field was successfully observed on magnetic particles labeled detection antibodies, anti-human TNF-${\alpha}$, which were bound to the immunologically captured TNF-${\alpha}$ on the gold coated quartz crystals. In the present system, the magnitude of frequency shift depends on both the strength of magnetic field and the amount of target antigen applied. Significant signal amplification was observed when the additional built-in residual stress generated by the modified magnetic particles under the magnetic field applied. Used in conjunction with a sandwich type non-competitive immunoassay format, the lower detection limit was calculated to be 25 $ngmL^{-1}$ and showed good linearity up to TNF-${\alpha}$ concentrations as high as 2.0 ${\mu}gmL^{-1}$. The sensitivity, most importantly, was improved up to 4.3 times compared with the same QCM system which was used only an antigen-antibody binding without additional magnetic amplification.
고정상,장승철,박덕수,김형훈,Yeon Kyoung Bahk 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.12
This study introduces a new concept for a simple, efficient and cheap sensitivity amplification of a Quartz Crystal Microbalance (QCM) based immunosensor system for the detection of tumor necrosis factor-alpha (TNF-α, TNF) by using an in-built magnetic system. The frequency shift due to the applied magnetic field was successfully observed on magnetic particles labeled detection antibodies, anti-human TNF-α, which were bound to the immunologically captured TNF-α on the gold coated quartz crystals. In the present system, the magnitude of frequency shift depends on both the strength of magnetic field and the amount of target antigen applied. Significant signal amplification was observed when the additional built-in residual stress generated by the modified magnetic particles under the magnetic field applied. Used in conjunction with a sandwich type non-competitive immunoassay format, the lower detection limit was calculated to be 25 ngmL−1 and showed good linearity up to TNF-α concentrations as high as 2.0 μgmL−1. The sensitivity, most importantly, was improved up to 4.3 times compared with the same QCM system which was used only an antigen-antibody binding without additional magnetic amplification.
연마제 워터젯을 이용한 복합재 미세가공의 백화현상에 대한 연구
박강수(Kang-su Park),박연경(Yeon-kyoung Bahk),고정상(Jeung-sang Go),신보성(Bo-sung Shin) 한국생산제조학회 2007 한국생산제조학회지 Vol.16 No.5
It is well known that abrasive waterjet(AWJ) was developed as a kind of high-density energy processing technologies. AWJ is used to obtain the better cutting quality of various materials such as metals, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However, AWJ device still has some problems to obtain the high quality of thin workpiece. In this paper, we investigated the optimal microcutting conditions of AWJ, such as maximum pressure, cutting speed and standoff distance of thin multi-layered materials. The experimental results show that AWJ has possibilities and potential to apply to the microcutting of thin multi-layered materials for IT industrial applications.
신보성(Bo-sung Shin),박강수(Kang-su Park),박연경(Yeon-kyoung Bahk),고정상(Jeung-sang Go) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.5
It is well known that abrasive waterjet (AWJ) was developed a kind of high-density energy processing technologies. AWJ is used to obtain the better cutting quality of various materials such as metals, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However AWJ have still been some difficulties to improve the quality of thin workpiece. In this paper, we investigate the optimal microcutting conditions of AWJ, such as maximum pressure, cutting speed and standoff distance, of thin multi-layered materials. The experimental results show that AWJ have possibilities and potential to apply to the microcutting of thin multi-layered materials for IT industrial applications.
신보성(Bo-sung Shin),박강수(Kang-su Park),박연경(Yeon-kyoung Bahk),고정상(Jeung-sang Go) 한국생산제조학회 2007 한국공작기계학회 춘계학술대회논문집 Vol.2007 No.-
It is well known that abrasive waterjet (AWJ) was developed a kind of high-density energy processing technologies. AWJ is used to obtain the better cutting quality of various materials such as metals, ceramics, glass and composite materials within a short manufacturing time because of the characteristics of heatless and noncontact processing. However AWJ have still been some difficulties to improve the quality of thin workpiece. In this paper, we investigate the optimal microcutting conditions of AWJ, such as maximum pressure, cutting speed and standoff distance, of thin multi-layered materials. The experimental results show that AWJ have possibilities and potential to apply to the microcutting of thin multi-layered materials for IT industrial applications.
증례보고 : 총대동맥활치환술 이후 혈액투석을 받은 환자에서 발생한 헤파린 기인성 혈소판 감소증 -증례보고-
정희진 ( Hee Jin Jeong ),김재광 ( Jae Kwang Kim ),최주연 ( Ju Yeon Choi ),윤승주 ( Seung Zhoo Yoon ),전윤석 ( Yun Seok Jeon ),박경운 ( Kyoung Un Park ),박재현 ( Jae Hyon Bahk ),안혁 ( Hyuk Ahn ),김종성 ( Chong Sung Kim ),김용락 ( 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.50 No.5
Heparin-induced thrombocytopenia (HIT) is an immunologically mediated complication of heparin therapy resulting in the consumption of platelets and a catastrophic thromboembolism. Both the clinical and laboratory features are important for a diagnosis of HIT. There have been 3 case reports of suspected HIT in Korea. However none have satisfied the laboratory features. We experienced a case of HIT, which satisfied both clinical and laboratory features, in a patient who received heparin during continuous veno-venous hemodiafiltration (CVVHD) used to treat acute renal failure that developed after a total aortic arch replacement with a cardiopulmonary bypass. The decreased platelet count and obstruction of extracorporeal filter of CVVHD by the blood clot was observed while receiving unfractionated heparin. The serum from the patient contained the anti heparin-platelet factor 4 antibody, and the condition was thus diagnosed as HIT. Argatroban, which is a direct thrombin inhibitor, was used to treat the thrombosis. (Korean J Anesthesiol 2006; 50: 600~4)