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RISS 인기검색어
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- 저자 : Prokopenko Yuriy (검색결과 3 건)
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( Kulpash Kaliaskarova ),( Yuriy Prokopenko ),( Zhansaya Muratova ),( Sergey Borovskiy ),( Tokan Sultanaliyev ),( Adilbek Mukazhanov ),( Bakhyt Zharkimbekov ),( Assan Zhexembayev ),( Gani Kuttymuratov 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: End-stage liver disease represents a major healthcare problem worldwide and in Kazakhstan, carrying a high risk for mortality. Around 1000 patients with end-stage liver disease need liver transplantation in Kazakhstan, more than 50 of them dying yearly without being transplanted. The aim of this paper was review treatment methods for end-stage liver cirrhosis in our center. Methods: Results of various treatment options for end-stage liver disease patients, treated in JSC National Scientific Center for oncology and transplantology since June 2013 so far, were reviewed. Results: Total of 18 liver transplantations, including 6 from cadaveric and 12 from live donors, were performed in our clinic since June 2013, so far. Etiology of liver disease was as follows: HCC (due to nonalcoholic steatohepatitis in 2, hepatitis B in 1) 3 patients, liver cirrhosis (due to alcoholic liver disease in 3, hepatitis C in 2, hepatitis B+D in 6, autoimmune hepatitis in 1, primary biliary cirrhosis in 2 and autoimmune hepatitis and hepatitis B in 1) 14 patients, remaining was 7-year old pediatric patient with biliary atresia. Out of 18 transplanted patients, 2 have succumbed in the early post-operative period due to hemorrhage, remaining 16 are followed-up, counting up to 32 months of disease and rejection-free survival. Since the establishment of hepatology beds at department of general therapy in June 2015, total of 122 patients with liver cirrhosis and hepatocellular carcinoma were treated so far up to February 2016. Methods of treatment of hepatocellular carcinoma included transarterial chemoembolisation used 10 times in 6 patients, 1 patient has succumbed after 3 months of being diagnosed. Treatment options for portal hypertension in 113 liver cirrhosis patients included: esophageal varices ligation and sclerotherapy in 45 patients, splenic artery and esophageal varices embolisation in 22 patients with no complications dated and treatment with beta blockers in the rest of the patients. Out of 113 patients, 1 has succumbed due to the disease progression since start of follow-up in June 2015. Conclusions: Liver transplantation is the only viable option for end-stage liver disease patients. Portal hypertension treatment options using endoscopic and endovascular methods may provide sufficient short-term effect with good safety profile while being waitlisted, thus making liver transplantation available for more patients.
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Piezo-controlled Dielectric Phase Shifter
Victor Kazmirenko,Yuriy Poplavko,Moongi Jeong,Beomjin Kim,Yuriy Prokopenko,Sunggi Baik 한국전자파학회JEES 2006 Journal of Electromagnetic Engineering and Science Vol.6 No.1
A sandwich structure of dielectric material and air gap inside a rectangular waveguide is proposed as a fast electrically tunable low-loss phase shifter. As the dielectric material is shifted up and down by piezoelectric actuator and, thereby, the thickness of air gap is changed, the effective dielectric constant of the sandwich structure is varied. Phase shifters based on the sandwich structure with different dielectric materials showed phase shift of 20~200˚/㎝ at X-band as the thickness of air gap varied up to 30 ㎛. The idea can be extended toward low-loss millimeter wave phase shifters since modern microwave ceramics have been developed to show very low dielectric loss(tanδ~10<SUP>-4</SUP>).
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Jeong, Moongi,Kim, Beomjin,Poplavko, Yuriy,Kazmirenko Victor,Prokopenko Yuriy,Baik, Sunggi The Korean Ceramic Society 2005 한국세라믹학회지 Vol.42 No.7
A waveguide method is developed to study the materials with relatively large dielectric constants at microwave range. Basically, the method is similar to the previous waveguide methods represented by short-circuit line and transmission/reflection measurement methods. However, the complex permittivity is not determined by the shift in resonance frequencies, but by numerical analysis of measured scattering parameters. In order to enhance microwave penetration into the specimen with relatively large permittivity, a dielectric plate with lower permittivity is employed for impedance matching. The influences of air gap between the specimen and waveguide wall are evaluated, and the corresponding errors are estimated. The propagation of higher order modes is also considered. Experimental results for several reference ceramics are presented.
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