Mizuho–DL Financial Technology Co., Ltd.Mizuho–DL Financial Technology Co., Ltd.

One MIZUHO

Research and Studies

Patents both in Japan and in the US granted for a random number generation on a GPU

Date:Sep. 1, 2014
Author:Tomohisa Yamakami

We are pleased to announce that we have earned patents for a method and apparatus of random number generation by a GPU in Japan and in the US.
The invention is for a method to parallelize to generate random numbers without changing its sequence, when we convert existing codes for GPU computing to speed up.
It is possible to minimize the numerical differences between CPU and GPU.
This has the effect of reducing the work relating to the development and verification of GPU computing and we will be able to respond to customer needs quickly.
(Japan patent number 5059928 and US patent number 8786617.)

A comprehensive framework for implementing quantitative stress tests

Date:Dec. 27, 2013
Author:yasushi–takano/jiro–hashiba/rintaro–anraku/ryuichi–sato/sakae–mizuki/akinori–kohno

In this paper, we propose an extension of the firm–value model, which is a standard method for measuring credit risk, so that the model can incorporate the information about macroeconomic indicators. We also explain the method for performing macro stress tests with this model. The extension, which is consistent with the firm–value model, has several advantages. First, we can perform a wide range of analyses with a lot of macroeconomic indicators taken into account. Second, we can calculate credit risk measures under stressed conditions at industry– or firm–level. Finally, stress tests are easy to implement with this model, thereby enabling us to examine various stress scenarios. Using this method, we can identify the weak points of a credit portfolio and obtain the information useful for working out effective action plans. In addition, we propose a method for performing reverse stress tests with the extended firm–value model.

Patents both in Japan and in the US granted for a fast and highly accurate method of calculating credit risks of portfolios

Date:Apr. 23, 2010
Author:yasushi–takano⁄jiro–hashiba

We are pleased to announce that we have granted patents both in Japan and in the United States for a method and apparatus of quickly and accurately calculating credit risks of portfolios.
Please see the document here for more information about this invention. (US patent number 7627511.)

An Extension of CreditGrades Model Approach with Levy Process (published in "Quantitative Finance")

Date:Jul. 30, 2008
Author:Takaaki Ozeki⁄Yuji Umezawa⁄Akira Yamazaki⁄Daisuke Yoshikawa

This paper proposes an extended CreditGrades model called the Levy CreditGrades model, which is driven by a Levy process. In this setting, quasi closed-form formulae for pricing equity options on a reference firm and for calculating its survival probabilities are derived.

A Novel Methodology for Credit Portfolio Analysis:
Numerical Approximation Approach

Date:Apr. 24, 2008
Author:Yasushi Takano⁄Jiro Hashiba

This paper proposes a novel numerical methodology for quickly and accurately computing risk measures of a credit portfolio such as VaR(Value at Risk) and CVaR(Conditional Value at Risk), and risk contributions of obligors to these risk measures.

For a brief review of the paper, refer to the following document.

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