Takahiro Yoshida

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This paper examines numerical algorithms for factorization of a low-rank matrix with missing components. We first propose a new method that incorporates a damping factor into the Wiberg method to solve the problem. The new method is characterized by the way it constrains the ambiguity of the matrix factorization, which helps improve both the global(More)
The quantitative performance indicators of Physical Unclonable Functions (PUFs)\Randomness, Steadiness, Correctness, Diffuseness and Uniqueness\are strictly defined and applied to the evaluation of 45 arbiter PUFs on Virtex-5 FPGAs. The indicators effectively reflect the characteristics of PUFs ranging from 0 to 1 with 1 being the highest(More)
Temperature is a primary environmental cue for seed germination of many weeds and vegetables. To investigate the mechanism of germination regulation by temperature, we selected five high temperature (thermoinhibition)-resistant germination mutants (TRW lines) from 20,000 T-DNA insertion lines of Arabidopsis. Segregation analyses indicated that each of the(More)
Antitumor 2'-deoxycytidine (dCyd) analogs such as gemcitabine (dFdC), cytarabine (Ara-C), and 2'-C-cyano-2'-deoxy-1-β-d-arabinofuranosylcytosine (CNDAC) are activated by dCyd kinase, whereas cytidine deaminase (CDA) inactivates them by conversion to their uracil forms. To elucidate the relationship between the chemosensitivity to antitumor dCyd nucleosides(More)
Recently, not only still pictures but also moving pictures are displayed on the PDAs or cellular phones. When we take a look such pictures, the picture quality seems to be better than those on the CRTs or the large LCDs. In order to clarify the reason, we have investigated the relationship between the subjective quality of different size of pictures with(More)
absTracT It is desirable to build up a lecture video library to enable students to view past lectures at any time and from anywhere on their PCs. For this purpose, we developed a lecture video player/maker system (Yoshida, 2002, 2003). In developing this system, we considered the usability for students and oper-ability for teachers. The player includes a(More)
Although any networked control system is specified by the combination of the <italic>network structure</italic> and the <italic>dynamics of the components</italic>, one often encounters a situation where the former is <italic>known</italic> but the latter is (almost) <italic>unknown</italic>. In such a case, we cannot apply any analysis and design method(More)
In recent years, biometrics authentication has been widely used to realize high security in airports, office buildings and so on. In public area, surveillance cameras, which are combined with a high efficient coding recorder such as MPEG2 or MPEG4 recorder, are set to take face images of pedestrians and car license plates. However, high compression for(More)