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VRender3D 프로세서를 위한 Mobile 3D Engine 포팅
정일동(Il-dong Jung),Alexander O. Fedorov,김용태(Yong-tae Kim),이군석(Koon-seok Lee) 한국정보과학회 2008 한국정보과학회 학술발표논문집 Vol.35 No.1
PDA와 같은 이동단말에서 화려한 3D 그래픽을 보여주는 것은 그래픽 시스템 리소스의 제약이 있다. Mobile 3D 엔진은 모델의 움직임을 계산하여 동적으로 3D 그래픽을 만들어 내기 때문에 그래픽 시스템 뿐만 아니라, 충분한 성능의 프로세서와 여유의 메모리까지 지원되어야 한다. 본 논문에서는 Mobile 3D 엔진의 제약 사항과 그 해결 방법을 제시하였다. ARM9 Core를 기반으로 3D 가속 기능을 가진 VRender3D에 실제로 OpenGL/ES를 기반으로 하는 Mobile 3D 엔진을 포팅 (porting) 하고, 그 성능을 동적인 3D 영상으로 평가하였다.
Naumov, Nikolai G.,Tarasenko, Maria S.,Virovets, Alexander V.,Kim, Youngmee,Kim, Sung-Jin,Fedorov, Vladimir E. Wiley-VCH 2006 European journal of inorganic chemistry Vol. No.
<P>The interaction of aqueous solutions of octahedral cluster anions [Re<SUB>6</SUB>Q<SUB>8</SUB>(CN)<SUB>6</SUB>]<SUP>4–</SUP> with rare earth cations in the presence of glycerol resulted in the formation of a new family of compounds [Ln<SUB>2</SUB>(H<SUB>2</SUB>L)<SUB>2</SUB>(H<SUB>3</SUB>L)<SUB>4</SUB>][Re<SUB>6</SUB>Q<SUB>8</SUB>(CN)<SUB>6</SUB>] (where Ln = La, Nd, and Gd; Q = S, Se; H<SUB>3</SUB>L = glycerol; H<SUB>2</SUB>L<SUP>–</SUP> = glycerolate anion). All compounds are isostructural and crystallize in the P<TEX>$\bar {1}$</TEX> space group. Crystal structures are built from octahedral cluster anions [Re<SUB>6</SUB>Q<SUB>8</SUB>(CN)<SUB>6</SUB>]<SUP>4–</SUP> and centrosymmetrical dimers [Ln<SUB>2</SUB>(H<SUB>2</SUB>L)<SUB>2</SUB>(H<SUB>3</SUB>L)<SUB>4</SUB>]<SUP>4+</SUP> that have three different binding modes of glycerol. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)</P> <B>Graphic Abstract</B> <P> <img src='wiley_img/14341948-2006-2006-2-EJIC200500542-fig000.gif' alt='wiley_img/14341948-2006-2006-2-EJIC200500542-fig000'> </P>
Anisotropic absorption of CdSe/ZnS quantum rods embedded in polymer film
Mukhina, Maria V.,Maslov, Vladimir G.,Baranov, Alexander V.,Artemyev, Mikhail V.,Fedorov, Anatoly V. Techno-Press 2013 Advances in nano research Vol.1 No.3
An approach to achieving of spatially homogeneous, ordered ensemble of semiconductor quantum rods in polymer film of polyvinyl butyral is reported. The CdSe/ZnS quantum rods are embedded to the polymer film. Obtained film is stretched up to four times to its initial length. A concentration of quantum rods in the samples is around $2{\times}10^{-5}$ M. The absorption spectra, obtained in the light with orthogonal polarization, confirm the occurrence of spatial ordering in a quantum rod ensemble. Anisotropy of the optical properties in the ordered quantum rod ensemble is examined. The presented method can be used as a low-cost solution for preparing the nanostructured materials with anisotropic properties and high concentration of nanocrystals.
Long-term Survival in Patients Treated with a Robotic Radiosurgical Device for Liver Metastases
Sebastian Stintzing,Jobst von Einem,Christoph Fueweger,Alfred Haidenberger,Michael Fedorov,Alexander Muavcevic 대한암학회 2019 Cancer Research and Treatment Vol.51 No.1
Purpose The treatment of liver metastases with local procedures is a fast progressing field. For the most, long-term survival data is missing raising questions with regard to the efficacy of such modalities when compared to surgical resection. Radiosurgery using the CyberKnife device enables the treatment of liver lesions with a single-session approach. Here we present longterm survival data to explore the curative potential of this strategy. Materials and Methods Patients with oligo-metastatic disease limited to the liver have been treated with single-session or hypo-fractioned radiosurgery in curative intent and prospectively followed until death. Follow-up (FU) was performed using magnetic resonance imaging (MRI) 2 months after radiation and at 3-month intervals for the first 2 years. After that annual computed tomography or MRI scans were performed until 5 years post-treatment. Local recurrence in the radiated volume and recurrence outside the treated volume were used to define local and distant progression. Survival times were censored at the time of the last FU. Results One hundred twenty-six patients treated between 2005 and 2015 with 194 lesions were included into this study. Median FU was 30.0 months. According to Response Evaluation Criteria in Solid Tumors, 55.2% had a complete remission and 11.3% a partial remission. Seventy-two point two percent recurred outside the radiated lesion and median overall survival was 35.2 months with a 3-year survival rate of 47.7%. Conclusion This is currently the largest cohort of stereotactic body radiation therapy treated liver lesions with a median long-term follow of 30 months. Robotic radiosurgery using a single session approach has a high efficacy to control the radiated lesion with the potential to cure patients.
Baek, Woohyeon,Gromilov, Sergey A.,Kuklin, Artem V.,Kovaleva, Evgenia A.,Fedorov, Alexandr S.,Sukhikh, Alexander S.,Hanfland, Michael,Pomogaev, Vladimir A.,Melchakova, Iuliia A.,Avramov, Paul V.,Yusen American Chemical Society 2019 NANO LETTERS Vol.19 No.3
<P>For the first time, lonsdaleite-rich impact diamonds from one of the largest Popigai impact crater (Northern Siberia) with a high concentration of structural defects are investigated under hydrostatic compression up to 25 GPa. It is found that, depending on the nature of a sample, the bulk modulus for lonsdaleite experimentally obtained by X-ray diffraction in diamond-anvil cells is systematically lower and equal to 93.3-100.5% of the average values of the bulk moduli of a diamond matrix. Density functional theory calculations reveal possible coexistence of a number of diamond/lonsdaleite and twin diamond biphases. Among the different mutual configurations, separate inclusions of one lonsdaleite (001) plane per four diamond (111) demonstrate the lowest energy per carbon atom, suggesting a favorable formation of single-layer lonsdaleite (001) fragments inserted in the diamond matrix. Calculated formation energies and experimental diamond (311) and lonsdaleite (331) powder X-ray diffraction patterns indicate that all biphases could be formed under high-temperature, high-pressure conditions. Following the equation of states, the bulk modulus of the diamond (111)/lonsdaleite (001) biphase is the largest one among all bulk moduli, including pristine diamond and lonsdaleite.</P> [FIG OMISSION]</BR>
Nayeon Ko,Hansu Park,Hyejung Jung,Go Iwahana,Alexander Fedorov,Jinho Ahn 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
Multiple geochemical analyses may provide important implication about the ice-wedge formation and in-situ greenhouse gas (GHG) production mechanisms. Here we present new results from ice-wedge ice sampled at Zyryanka, Northeastern Siberia (65°93’N, 150°89’E). To constrain the age of the ice wedge, plant residues and CO₂ gas in the ice were analyzed for 14C dating and we obtained ~ 4000 and ~ 1000 years before 1950 CE for the side and center parts of the ice wedge, respectively. The δ(N2/Ar) of the ice wedges ranges from -43.9 to -1.8% with regard to modern air, indicating that the Zyryanka ice wedge was formed by both liquid water and dry snow. Using the δ(N₂/Ar) we calculate the melting fraction of gas species. The melting fraction is well supported by bubble shapes and orientation: In areas where melting fractions are relatively high the bubble are elongated with preferred orientation. The δ(O₂/Ar) value of the Zyryanka ice wedges ranges from -99.1 to -37.6% with regard to modern air, implying oxygen gas might have been consumed considerably by respiration of microorganisms in the ice wedge ice. We observe a negative correlation between CO₂ and O₂ gas concentrations (r=-0.92, p=0.01), indicating microbial respiration within the ice wedge ice. N₂O and CO₂ concentrations shows a weak positive correlation (r = 0.23, p = 0.0003), as does the correlation between CH₄ and CO₂ correlation (r = 0.35, p = 0.0007). We also observe a weak negative correlation between N₂O and CH₄ (r =-0.39, p = 0.04). The δ<SUP>18</SUP>O of ice melt ranges from -28.6 to -19.1‰, and the horizontal profile shows a symmetric structure with high δ<SUP>18</SUP>O values in the side parts and low in the center part. We will continue to scrutinize ice wedge formation process with additional stable water isotope data of modern precipitates at Zyryanka. Our study shows that the gas mixing ratios in ice wedges and stable water isotope analysis may help better understanding the biogeochemical environments during and after the formation of ice wedges.
Hansu Park,Na-Yeon Ko,JeongEun Kim,Thomas Opel,Sebastian Wetterich,Alexander Fedorov,Anderei Shepelev,Jinho Ahn 대한지질학회 2021 대한지질학회 학술대회 Vol.2021 No.10
The Batagay megaslump (Yana Uplands, Northeast Siberia) exposes Pleistocene and Holocene permafrost layers with two massive ice complexes. Previous studies suggest that the ages of these ice layers as MIS4-2 and MIS16 for the Upper and Lower Ice Complexes, respectively. In this study, we present gas concentrations in air bubbles occluded in the ice complexes. We extracted gas by both wet and dry extraction methods and using gas chromatography system to analyze dry molar mixing ratios. CO₂, N₂O, and CH₄ concentrations cover large ranges. We observe CO₂ concentrations of 1.9-10.3%, N₂O of 0.1-8 ppm, and CH₄ of 30-170 ppm for the Lower Ice Complex, while CO₂ of 0.03-8.89%, N₂O of 0.3-70 ppm, and CH₄ of 5-980 ppm for the Upper Ice Complex. The N₂O concentration in the Upper Ice Complex is extraordinarily high compared with other permafrost regions. Also, the CH₄ and N₂O show a weak negative correlation in both ice complexes. The δ(N₂/Ar) values range from -8.06% to 33.86% for the Lower Ice Complex and -5.49% to 30.64% for the Upper Ice Complex. These values indicate that there is little melting during and after the ice complex formation, which is also supported by investigation of the bubble shapes. On the other hand, the δ(O₂/Ar) values range -89.01 to –67.43% and -98.07 to -47.06% for the Lower and Upper Ice Complexes, respectively. The highly depleted δ(O₂/Ar) values may indicate strong oxidation reactions by microbial activities and/or abiological oxidation reactions. Our future research with isotope analyses such as δ<SUP>15</SUP>N of N₂O and δ<SUP>13</SUP>C, <SUP>14</SUP>C of CO₂ may help us better constrain formation processes of the ice wedges and origin of the greenhouse gases. These studies will serve as a basis for studying the impact of global warming on permafrost.