排序方式: 共有26条查询结果,搜索用时 15 毫秒
1.
Parametric embedding for class visualization 总被引:1,自引:0,他引:1
Iwata T Saito K Ueda N Stromsten S Griffiths TL Tenenbaum JB 《Neural computation》2007,19(9):2536-2556
We propose a new method, parametric embedding (PE), that embeds objects with the class structure into a low-dimensional visualization space. PE takes as input a set of class conditional probabilities for given data points and tries to preserve the structure in an embedding space by minimizing a sum of Kullback-Leibler divergences, under the assumption that samples are generated by a gaussian mixture with equal covariances in the embedding space. PE has many potential uses depending on the source of the input data, providing insight into the classifier's behavior in supervised, semisupervised, and unsupervised settings. The PE algorithm has a computational advantage over conventional embedding methods based on pairwise object relations since its complexity scales with the product of the number of objects and the number of classes. We demonstrate PE by visualizing supervised categorization of Web pages, semisupervised categorization of digits, and the relations of words and latent topics found by an unsupervised algorithm, latent Dirichlet allocation. 相似文献
2.
Tomoyuki Adachi Naoki Wakiya Naonori Sakamoto Osamu Sakurai Kazuo Shinozaki Hisao Suzuki 《Journal of the American Ceramic Society》2009,92(S1):S177-S180
Fe3 O4 –BaTiO3 composite particles were successfully prepared by ultrasonic spray pyrolysis. A mixture of iron(III) nitrate, barium acetate and titanium tetrachloride aqueous solution were atomized into the mist, and the mist was dried and pyrolyzed in N2 (90%) and H2 (10%) atmosphere. Fe3 O4 –BaTiO3 composite particle was obtained between 900° and 950°C while the coexistence of FeO was detected at 1000°C. Transmission electron microscope observation revealed that the composite particle is consisted of nanocrystalline having primary particle size of 35 nm. Lattice parameter of the Fe3 O4 –BaTiO3 nanocomposite particle was 0.8404 nm that is larger than that of pure Fe3 O4 . Coercivity of the nanocomposite particle (390 Oe) was much larger than that of pure Fe3 O4 (140 Oe). These results suggest that slight diffusion of Ba into Fe3 O4 occurred. 相似文献
3.
Naonori Sakamoto Shunji Araki Masahiro Yoshimura 《Journal of the American Ceramic Society》2009,92(S1):S157-S161
Eutectic melt solidification is shown to avoid cracking during solidification by quenching an amorphous phase. Subsequent annealing results in micro/nanostructure ceramics. This strategy has been applied to HfO2 –Al2 O3 –GdAlO3 and Y2 O3 –CaO–Al2 O3 ternary systems that have deep eutectics. In most cases, ceramic materials cracks when they are solidified from melt due to the thermal stress accumulated on the grain boundaries, the large specific volume difference between the melt and the crystalline solid, etc. The main reason why this strategy works is that a eutectic composition yields an amorphous phase from the melts by rapid cooling and the amorphous phase enables to design crystallization without cracking by postannealing. Appropriate postannealing for the quenched amorphous enables to control the crystallization behavior from the amorphous phase, which yields nanostructured composites without cracking. For the HfO2 –Al2 O3 –GdAlO3 case, the melt solidification and postannealing yields a nanocomposite with high transparency due to reduced scattering of 5–10 nm crystallites. For the Y2 O3 –CaO–Al2 O3 case, a plate-shaped bulk composite is obtained without cracking by molding the melt and postannealing. 相似文献
4.
Shiro Usui Nilton Liuji Kamiji Tatsuki Taniguchi Naonori Ueda 《Neural computing & applications》2011,20(7):993-999
With the increasing amount of information available in recent years, searching for the desired content is becoming a challenging
task. In this work, a tool for searching abstracts submitted to scientific conferences is introduced. It not only searches
abstracts by the given keyword(s) but also displays abstracts related to a single or multiple selection. It also displays
highly relevant abstracts together with possible keywords to help users refine their search. Analysis of the conditional similarity
algorithm proposed here has shown that it does provide better output compared to ordinary cosine similarity, as well as the
list of possible keywords reflects results of latent topic analysis. An interface for storing and sorting selected abstracts
for future review and/or printing is also provided. 相似文献
5.
Aoi Sugiyama Shunji Araki Naonori Sakamoto Tomoaki Watanabe Masahiro Yoshimura 《Journal of Electroceramics》2006,17(1):71-74
Ceramics have generally been fabricated from powders by shape forming & sintering methods except for glasses and glass ceramics.
Glasses and glass ceramics can be fabricated by melting methods. The melting method has not only higher productivity but also
higher shape forming ability than powder processes via forming & sintering methods. Thus we have reinvestigated melting methods
in binary and ternary oxides systems to fabricate amorphous bulk ceramics and bulk nano composites. We have successfully fabricated
amorphous phases by simple melt solidification methods in ternary eutectic melts in the HfO2-Al2O3-Gd2O3system. The present study demonstrates the formation of the amorphous phases in quaternary systems HfO2-Al2O3-Gd2O3-Eu2O3. Furthermore, we have also succeeded to fabricate nano-structured bulk ceramics, which consisted of constituent oxide grains
with 20–100 nm in size, by post annealing of the amorphous phase. 相似文献
6.
Harinarayan Das Nipa Debnath Atsushi Toda Takahiko Kawaguchi Naonori Sakamoto Hiromichi Aono Kazuo Shinozaki Hisao Suzuki Naoki Wakiya 《Advanced Powder Technology》2017,28(7):1696-1703
The superparamagnetic magnesium ferrite (MgFe2O4) dense nanospheres are synthesized by ultrasonic spray pyrolysis (USP) method from different concentrations of the initial precursor solution. The effect of precursor solution concentration on the particle’s size, morphology, and superparamagnetic behavior has been investigated. XRD results confirm that studied precursor concentration (0.06, 0.12 and 0.24 M) exhibited single phase cubic structure. The mean crystallites size (called as primary particles) of 0.06, 0.12 and 0.24 M samples are 9.6, 11.5, 11.0 nm, respectively but the entire nanosphere’s diameter (called as secondary particles) increases from 206 to 340 nm with increasing precursor concentration. TEM analysis also reveals that nanospheres consist of densely aggregated crystallites of spherical shape and smooth surface. The value of polydispersity index (PDI) shows narrower size distribution for lower concentration. Magnetic properties indicate the superparamagnetic nature for all samples. Herein, the appropriate induction heat generation rate with better morphology was obtained for 0.06 M concentration. Ion release in the aqueous solution of the composition (about 95% for Mg; 99% for Fe) indicating better stability has been confirmed by ICP-OES test. In this approach, as-synthesized nanospheres are suitable for using as a heating agent in magnetic thermotherapy application. 相似文献
7.
Minakawa N Kawano Y Murata S Inoue N Matsuda A 《Chembiochem : a European journal of chemical biology》2008,9(3):464-470
We describe the design and proof of concept of a pair of chemical probes for investigating DNA-protein interactions-specifically, the incorporation of 7-bromo-7-deazaadenine and 3-bromo-3-deazaadenine 2'-deoxynucleosides (Br(7)C(7)dA and Br(3)C(3)dA) into oligodeoxynucleotides (ODNs)-and their utility. Whereas the bromo substituent of the Br(7)C(7)dA unit in an ODN duplex acts sterically to inhibit binding with NF-kappaB, which interacts with the duplex in its major groove, the bromo substituent of the Br(3)C(3)dA unit acts sterically to inhibit binding with RNase H, which interacts with the duplex in its minor groove. In addition, the utilization of ODNs containing 7-deazaadenine and 3-deazaadenine 2'-deoxynucleosides (C(7)dA and C(3)dA), together with the pair of chemical probes, afforded valuable information on the requirement for nitrogen atoms located in either the major or minor grooves. Accordingly, we were able to show the utility of ODNs containing Br(7)C(7)dA, Br(3)C(3)dA, C(7)dA, and C(3)dA for the investigation of DNA-protein interactions. 相似文献
8.
9.
Ryo Usami Naonori Sakamoto Kazuo Shinozaki Hisao Suzuki Naoki Wakiya 《Science and Technology of Advanced Materials》2011,12(3)
TiO2 thin films with a periodical two-dimensional close-packed hemispherical structure were prepared on Si substrates using pulsed laser deposition and close-packed monolayer polystyrene colloidal crystals as a template. Compared with conventional methods, which use a top-down approach, this route supports low-cost production of a periodic structure. Additionally, it is applicable to various ceramics for use in applications related to photonic crystals, surface self-cleaning materials, data storage media, bioassays, and so on. 相似文献
10.
Tadashi Ishigaki Kenji Toda Tomoaki Watanabe Naonori Sakamoto Nobuhiro Matsushita Masahiro Yoshimura 《Journal of Materials Science》2008,43(14):4749-4752
In order to synthesize compounds of various Perovskite-related structures, we have utilized a novel “melt synthesis technique”
for phosphors rather than the conventional solid state reaction techniques. The solid state reactions require multi-step processes
of heating/cooling with intermediate grindings to make homogeneous samples. However, for the melt synthesis, it is possible
to make a homogeneous sample in a single step within a short period of time (1–60 s) due to the liquid phase reaction in the
molten samples, which were melted by strong light radiation in an imaging furnace. In this study, we have prepared a red-phosphor
CaLaGaO4:Eu3+ which has a perovskite—related layered K2NiF4 structure. Well-crystallized CaLa1−x
Eu
x
GaO4 samples with the K2NiF4 structure have been obtained up to x = 0.25, but there was the formation of an olivine phase when x = 0.5–1.0. The red emission at 618 nm increased with the increasing value of x up to x = 0.25.
相似文献
Tadashi IshigakiEmail: |
Masahiro Yoshimura (Corresponding author)Email: |