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Cross Hole Type 비 연삭 밀링 인서트의 가공특성에 관한 연구
김택수,이상민,박휘근,채승수,이충석,손일복,김학규,이종찬 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-
This paper reports some experimental results on the machining performance of non-ground cross hole type milling inserts. Six kinds of milling inserts were manufactured without using grinding process. Machining experiments were carried out to compare the machining performance of non-ground inserts with that of ground ones. The experimental results indicate that the cutting forces and surface roughnesses of machined surface of both ground and non-ground inserts are comparable.
간세포암의 고주파 열치료 후 천자침 경로를 통한 전이 1례
조영완,박석주,진한영,김준영,이재익,강명주,박정하,윤정희,박성재,지삼룡,이연재,이상혁,설상영 인제대학교 2006 仁濟醫學 Vol.27 No.-
Radiofrequency ablation(RFA), as a form of minimally invasive therapy for hepatocellular carcinoma, has become an important treatment modality. Because of limitation of surgery, RFA has become standard therapy for hepatocellular carcinoma in some situations. But there are some complications of RFA such as bleeding, infection, hematoma, adjacent organ thermal damage including intestinal perforation, needle track seeding, and so on. There are few reports in the literature that systematically evaluate the incidence of needle tract seeding and its associated risk factors. And only 2 cases of needle tract seeding of hepatocellular carcinoma after RFA were reported in Korea. We report a case of needle tract seeding of hepatocellular carcinoma after RFA.
Kim, Yoon Jun,Kim, Hwi Young,Lee, Jeong-Hoon,Yu, Su Jong,Yoon, Jung-Hwan,Lee, Hyo-Suk,Kim, Chung Yong,Cheong, Jae Youn,Cho, Sung Won,Park, Neung Hwa,Park, Byung Lae,Namgoong, Seok,Kim, Lyoung Hyo,Cheo Oxford University Press 2013 Human Molecular Genetics Vol.22 No.20
<P>Hepatitis B virus (HBV) infection is the predominant risk factor for chronic hepatitis B (CHB), liver cirrhosis (LC) and hepatocellular carcinoma (HCC). Recently, several genome-wide association studies (GWASs) of CHB identified human leukocyte antigen (HLA) loci, including HLA-DP and HLA-DQ in Asian populations, as being associated with the risk of CHB. To confirm and identify the host genetic factors related to CHB infection, we performed another GWAS using a higher-density chip in Korean CHB carriers. We analyzed 1400 samples from Korean population (400 CHB cases and 1000 population controls) using a higher-density GWAS chip [1 140 419 single nucleotide polymorphisms (SNPs)]. In subsequent replication analysis, we further analyzed in an independent study of a Korean CHB cohort consisting of 2909 Korean samples (971 cases and 1938 controls). Logistic regression methods were used for statistical analysis adjusting for age and sex as covariates. This study identified two new risk-associated loci for CHB on the HLA region of chromosome 6, e.g. rs652888 on euchromatic histone-lysine-methyltransferase 2 (EHMT2, <I>P</I> = 7.07 × 10<SUP>−13</SUP>) and rs1419881 on transcription factor 19 (TCF19, <I>P</I> = 1.26 × 10<SUP>−18</SUP>). Conditional analysis with nearby HLA CHB loci that were previously known, confirmed the independent genetic effects of these two loci on CHB.</P><P><B>Conclusion</B>: The GWAS and the subsequent validation study identified new variants associated with the risk of CHB. These findings may advance the understanding of genetic susceptibility to CHB.</P>
Kim, Seong-Yeon,Na, Yeon-Joo,Kim, Dong-Ju,Kim, Yeong-Seok,Kim, Hyeong-Min,Hwang, Sung-Ha,Kwak, Ji-Yeon,Kuh, Hyo-Jeong,Lee, Jae-Hwi The Korean Society of Pharmacology 2012 The Korean Journal of Physiology & Pharmacology Vol.16 No.3
The objective of the present study was to establish the method of measurement of hydrogen peroxide and to estimate the anti-oxidative effect of genistein in the skin. UVB induced skin oxidation and anti-oxidative effect of genistein formulations were evaluated by determining levels of hydrogen peroxide. The mechanism involved in the determination of hydrogen peroxide is based on a color reaction between ferric ion ($Fe^{3+}$) and xylenol orange, often called FOX assay and subsequent monitoring of absorbance values of the reactant at 540 nm. The reaction was to some extent pH-dependent and detection sensitivity was greatest at pH 1.75. Genistein liposomal gel demonstrated better anti-oxidative effect with regard to lowering hydrogen peroxide levels elevated by UVB irradiation compared to genistein-suspended gel. A linear relationship has been observed between anti-oxidative effect of genistein and drug deposition in the skin tissue. Genistein liposomal gel resulting in the localization of the drug in the deeper skin led to improved anti-oxidative effect compared to genistein gel. The suggested method for evaluation of oxidation of the skin can be used as a tool to screen effective anti-oxidative agents and their delivery systems acting on the skin.
Kim, Jae Il,Lee, Sang Hyo,Kang, Hwi Ju,Kwon, Doo Yeon,Kim, Da Yeon,Kang, Won Seok,Kim, Jae Ho,Kim, Moon Suk Royal Society of Chemistry 2011 SOFT MATTER Vol.7 No.18
<P>Thermogelling block copolymers are central to a variety of biomedical applications. Here, we examined the thermal phase transition behavior of the MPEG-<I>b</I>-PCL diblock copolymer (MC) with carboxyl (MC–COOH) and amine (MC–NH<SUB>2</SUB>) groups, and their salt forms (MC–COO<SUP>−</SUP>Na<SUP>+</SUP> and MC–NH<SUB>3</SUB><SUP>+</SUP>Cl<SUP>−</SUP>) at the chain ends of the PCL segment. All MC copolymers formed an opaque emulsion sol at room temperature when prepared as 20 wt% aqueous solutions. As the temperature increased from room temperature, a sol-to-gel transition was observed for MC, MC–COOH, and MC–NH<SUB>2</SUB> copolymers, although not for their salt forms (MC–COO<SUP>−</SUP>Na<SUP>+</SUP> and MC–NH<SUB>3</SUB><SUP>+</SUP>Cl<SUP>−</SUP>). Introduction of a carboxyl and an amine group into the PCL segment decreased the crystallinity and hydrophobicity of the PCL block domains, which altered the onset temperature of gelation (the gel temperature range) and the maximum viscosity. We confirmed that the sol-to-gel phase transition behavior, which indicated the formation and destruction of a structured gel network of MC copolymers, depended on the crystallinity and hydrophobicity of the PCL domains in aqueous media.</P> <P>Graphic Abstract</P><P>In this work, we showed that the formation and destruction of a structured gel network of thermogelling block copolymers (MC, MC–COOH and MC–COO<SUP>−</SUP>Na<SUP>+</SUP>) depended on the crystallinity and hydrophobicity of the hydrophobic domains in aqueous media. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1sm05977g'> </P>