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( Pyoung Ahn ),( Jae Young Jang ),( Euiju Park ),( Soung Won Jeong ),( Young Hun Kim ),( Won Young Park ),( Dong Joon Oh ),( Sang Woo Cha ),( Young Deok Cho ),( Sae Hwan Lee ),( Hong Soo Kim ),( Boo S 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Poster Session Background: The lack of ideal biomarkers for the diagnosis and evaluation of the treatment effect has posed a major challenge to hepatocellular carcinoma (HCC). In the present study, the usefulness of AFP-L3 was analyzed and compared with AFP and protein induced by vitamin K absence or antagonist-II (PIVKA-II) for the detection of HCC. Methods: From July 2013 to March 2014, a retrospective comparison study was conducted at Soonchunhyang University Seoul Hospital. A total of 305 patients were investigated; 165 (54.1%) patients had chronic liver disease and 140 (45.9%) had HCC. Among the patients with HCC, 98 (70%) had newly diagnosed or viable HCC after treatment. We used a current diagnostic cut-off of 20ng/mL for AFP, 10% for AFP-L3 and 40 mAU/mL for PIVKA-II. We analyzed the diagnostic value of these tumor markers for the detection of HCC, respectively. Results: In all patients, the sensitivity and specificity of AFP, AFP-L3 and PIVKA-II were 55.1% and 89.4%, 62.2% and 92.8%, and 46.9% and 87.9%, respectively. The area under curve (AUC) of combination AFP and AFP-L3 showed higher value than the AUCs of other markers and combination (sensitivity of 79.6%, specifi city of 84.1%, and AUC of 0.818). ). In the viable HCC with AFP < 20ng/mL, the proportion with AFP-L3 of =10% was 54.5% (24/44). Conclusions: AFP-L3 was more sensitive and specifi c marker than conventional AFP and PIVKA-II. Additionally, the combination of AFP and AFP-L3 improved diagnostic value for the detection of viable HCC.
양식넙치(Paralichthys olivaceus)의 복수증에 관한 연구 -Edwardsiella tarda의 일부 특성과 병원성 및 대책-
한재철 ( Jae Cheol Han ),김영진 ( Young Jin Kim ),서형석 ( Heyng Seok Seo ),김영길 ( Young Gill Kim ),이근광 ( Keun Kwang Lee ),안병목 ( Pyoung Mok Ahn ) 한국동물위생학회 1997 한국동물위생학회지 (KOJVS) Vol.20 No.1
Characteristics, pathogenicity and control of the causative organisms isolated from diseased cultured flounder, Paralichthys olivaceus were studied. The causative organisms were identified as E tarda by biochemical and biophysical characteristics. Also, it strains were named as E tarda KBF-1 and E tarda KMF-1, and optimal pH of E tarda KBF-1 and E tarda KMF-1 were 8.0, and optimal concentration of NaCl. E tarda KBF1 was 0% and E tarda KMF-1 was 1%. In the pathogenicity test, 0~10 of the flounders of artificially infected group(E tarda KEF-1) with l0×l07cfu/fish were died within 60 hrs, but 0~9 flounders infected group with l.0×106 cfu/fish were died within 60 hrs. Also, 0~10 flounders infected group(E tarda KMF-1) with 1.0×l07cfu/fish were died within 36 hrs, while 0~7 flounders infected with l0×l06cfu/fish were died within 60 hrs. Drug sensitivity of E tarda KBF-l strain was resistant to AM, CF and N, and intermediate to E, K and S, and sensitivity to C, G, SxT and FF. But E tarda KMF-l strain was resistant to CF, E and V, and intermediate to AM, C, N and SxT, and sensitivity to GM and FF.
박재석(Jae-suk Park),최주평(Joo-pyoung Choi),박순규(Soon-kyu Park),이수복(Su-bok Lee),안동명(Dong-myung Ahn),이원철(Won-cheol Lee) 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.11C
본 논문에서는 연방통신위원회 (Federal Communication Commission; FCC) 에서 제안한 CR (Cognitive Radio) 사용자가 주사용자 (primary user) 와 공존할 수 있는 간섭온도의 개념에 대해 살펴보고, 스펙트럼 센싱 (sensing)후 주사용자의 신호와 간섭 및 잡음 신호의 구분가능성 여부에 따라 이상적인 간섭온도 모델과 일반적인 간섭온도 모델로 구분하여 각각의 모델에 대한 CR 사용자의 대역폭, 송신전력 및 용량을 산출할 수 있는 구체적인 간섭온도 모델 및 간섭온도 다중접속 기술에 대해서 살펴본다. 특히, T. Clancy가 제안한 간섭온도 다중접속 기술에서 공존을 위해 주사용자에게 간섭을 미치지 않게 CR 사용자에게 할당하는 방안만을 고려하였지만, 본 논문에서는 CR 사용자의 성능까지도 고려하는 공존방안을 제시하였다. 또한, 간섭온도 모델링을 통해 CR 사용자의 허용할 수 있는 최대송신전력을 도출하였으며, 도출된 대역폭과 송신전력 이용 시 주사용자 및 CR 사용자의 QoS를 만족하여 서로 공존할 수 있는 방안을 제시하였다. In this paper, we examine the scheme that the CR (Cognitive Radio) user can coexist with primary user with obeying the concept of interference temperature proposed by FCC. Regarding to the capability of classifying the signals of primary user after the spectrum sensing, the interference temperature model can be discriminated by the ideal and generalized ones. And then, about each model, it can optimize the bandwidth and transmit power with satisfying predetermined capacity of CR user. Especially, it has been considered to allocate to CR user not to interfere to primary users for proper coexistence in conventional interference temperature multiple access technique, proposed by T. Clancy, but this paper proposes the scheme that considering QoS of not only primary users, but also CR user. The hill-climbing algorithm is employed to produce the bandwidth and transmit power subject to satisfying the required capacity.
SiC/2014Al 복합재료의 계면현상 : (2) 계면의 제어 Tailoring the Interfaces
이재철,이호인,심재혁,석현광,안재평 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.2
A methodology to control the interfacial microstructures, while suppressing the formation of Al₄C₃ in wrought Al alloy composites reinforced with SiC, was demonstrated. Thermodynamic calculations were carried out to elucidate how one can select process parameters in terms of alloy composition and fabrication temperature to obtain intended interfaces. Experimental verifications were conducted using SEM and TEM to validate calculated results. The reaction mechanisms for forming various interfaces were identified both theoretically and experimentally. The evaluations of the interfacial bonding strengths and interfacial stability, at elevated temperatures were carried for various interface type.
<i>In vivo</i> corrosion mechanism by elemental interdiffusion of biodegradable Mg–Ca alloy
Jung, Jae‐,Young,Kwon, Sang‐,Jun,Han, Hyung‐,Seop,Lee, Ji‐,Young,Ahn, Jae‐,Pyoung,Yang, Seok‐,Jo,Cho, Sung‐,Youn,Cha, Pil‐,Ryung,Kim, Yu‐,Chan,Seo Wiley Subscription Services, Inc., A Wiley Company 2012 Journal of biomedical materials research. Part B, Vol.b100 No.8
<P><B>Abstract</B></P><P>We elucidated the <I>in vivo</I> corrosion mechanism of the biodegradable alloy Mg–10 wt % Ca in rat femoral condyle through transmission electron microscope observations assisted by focused ion beam technique. The alloy consists of a primary Mg phase and a three‐dimensional lamellar network of Mg and Mg<SUB>2</SUB>Ca. We found that the Mg<SUB>2</SUB>Ca is rapidly corroded by interdiffusion of Ca and O, leading to a structural change from lamellar network to nanocrystalline MgO. In contrast to the fast corrosion rate of the lamellar structure, the primary Mg phase slowly changes into nanocrystalline MgO through surface corrosion by O supplied along the lamellar networks. The rapid interdiffusion induces an inhomogeneous Ca distribution and interestingly leads to the formation of a transient CaO phase, which acts as a selective leaching path for Ca. In addition, the outgoing Ca with P from body fluids forms needle‐type calcium phosphates similar to hydroxyl apatite at interior and surface of the implant, providing an active biological environment for bone mineralization. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2012.</P>
Rapid <i>In Vitro</i> Corrosion Induced by Crack-Like Pathway in Biodegradable Mg-10% Ca Alloy
Jung, Jae-Young,Kwon, Sang-Jun,Han, Hyung-Seop,Yang, Gui Fu,Lee, Ji-Young,Yang, Seok-Jo,Cho, Sung-Youn,Cha, Pil-Ryung,Kim, Young-Yul,Kim, Yu-Chan,Seok, Hyun-Kwang,Ahn, Jae-Pyoung Cambridge University Press 2013 Microscopy and Microanalysis Vol.19 No.5
<B>Abstract</B><P>The <I>in vitro</I> corrosion mechanism of the biodegradable cast Mg-10% Ca binary alloy in Hanks' solution was evaluated through transmission electron microscopy observations. The corrosion behavior depends strongly on the microstructural peculiarity of Mg2Ca phase surrounding the island-like primary Mg phase and the fast corrosion induced by the interdiffusion of O and Ca via the Mg2Ca phase of lamellar structure. At the corrosion front, we found that a nanosized crack-like pathway was formed along the interface between the Mg2Ca phase and the primary Mg phase. Through the crack-like pathway, O and Ca are atomically exchanged each other and then the corroded Mg2Ca phase was transformed to Mg oxides. The <I>in vitro</I> corrosion by the exchange of Ca and O at the nanosized pathway led to the rapid bulk corrosion in the Mg-Ca alloys.</P>
SiC/2014Al 복합재료의 계면현상 : (1) 계면특성 개질 (I) Modification of Interfacial Characteristics
이재철,이호인,안재평,시충양 대한금속재료학회(대한금속학회) 1999 대한금속·재료학회지 Vol.37 No.11
Methodologies both to avoid the formation of Al₄C₃ and to tailor the interfacial structures in the SiC/2014Al composite were demonstrated. Modification of the interfacial structures in the SiC/2014Al composite were made by forming SiO₂ layers on the surfaces of SiC via the passive oxidation at elevated temperatures. In the 2014Al composite reinforced oxidized SiC, nano-sized MgAl₂O₄ and Si crystals were observed to form at the interfacial region as a result of the reaction between the SiO₂ layer and the matrix. On the other hand, in the case of the 2014Al composite reinforced unoxidized SiC, SiC were found to react with Al to form both Al₄C₃ and Si. Crystallographic structures of the observed interfacial products were characterized using EDS and CBED of TEM.
Lee, Jongmin,Ahn, Jae-Pyoung,Kim, Sang Woo American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.1
<P>Well-crystallized cerium dioxide with cubic phase were formed and self-assembly grown to nanofibers or nanosheets via a solvothermal precipitation from near-supercritical fluids without any help of metal catalysts or capping agents. The self-assembly attachment process without any preferred or selective orientation dominated the growth of the polycrystalline nanofibers or nanosheets consisting of grains of approximately 3 nm to which are formed by the coalescence of the single crystalline cerium oxide seeds. The growth is attributed to be driven by phase separation due to partial compatibility between ethyl alcohol and supercritical carbon dioxide fluid during the precipitation reaction, not by different surface energies or defects. With increasing temperature, the nanofibers with a weblike network structure were formed and then fused to large spherical particles. As a result, the polycrystalline fibers or sheets consisting of pure cerium dioxide phase were produced by the solvothermal reaction with an aid of the supercritical carbon dioxide from the alcoholic metal salt solution.</P>