著者

Takeyasu Ichikohji Koji Nakano Masamichi Ogami

出版者

Global Business Research Center

雑誌

Annals of Business Administrative Science (ISSN:13474464)

巻号頁・発行日

vol.21, no.2, pp.47-60, 2022-04-15 (Released:2022-04-15)

参考文献数

26

被引用文献数

1

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This study examines how the performance of startups during the time period up to their initial public offering (IPO) is affected by the macro environment, a topic that has not been given much consideration to date. Taking the end of 2012 (the beginning of Abenomics), when Japan’s economic environment shifted to a hot market, as the transition point, we analyzed companies that did IPOs in terms of such variables as the target market, the attributes of the companies in the sample (type of entrepreneurship), and the date of their actual establishment. We found that for those companies operating in an economically favorable environment, the average time period from startup to IPO was relatively long. This could be because an economically favorable environment and improved business conditions spurred startups that had been implementing a wait-and-see attitude. We have some reservations about using “time to IPO” naively as a performance indicator, and caution should be exercised when using it.

著者

Shunji FUNASAKA Koji NAKANO Yasuaki ITO

出版者

The Institute of Electronics, Information and Communication Engineers

雑誌

IEICE Transactions on Information and Systems (ISSN:09168532)

巻号頁・発行日

vol.E99.D, no.12, pp.2986-2994, 2016-12-01 (Released:2016-12-01)

参考文献数

22

被引用文献数

2 8

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The main contribution of this paper is to present a work-optimal parallel algorithm for LZW decompression and to implement it in a CUDA-enabled GPU. Since sequential LZW decompression creates a dictionary table by reading codes in a compressed file one by one, it is not easy to parallelize it. We first present a work-optimal parallel LZW decompression algorithm on the CREW-PRAM (Concurrent-Read Exclusive-Write Parallel Random Access Machine), which is a standard theoretical parallel computing model with a shared memory. We then go on to present an efficient implementation of this parallel algorithm on a GPU. The experimental results show that our GPU implementation performs LZW decompression in 1.15 milliseconds for a gray scale TIFF image with 4096×3072 pixels stored in the global memory of GeForce GTX 980. On the other hand, sequential LZW decompression for the same image stored in the main memory of Intel Core i7 CPU takes 50.1 milliseconds. Thus, our parallel LZW decompression on the global memory of the GPU is 43.6 times faster than a sequential LZW decompression on the main memory of the CPU for this image. To show the applicability of our GPU implementation for LZW decompression, we evaluated the SSD-GPU data loading time for three scenarios. The experimental results show that the scenario using our LZW decompression on the GPU is faster than the others.

著者

Koji HIRAKAWA Masaaki KATAYAMA Nobuaki SOH Koji NAKANO Toshihiko IMATO

出版者

The Japan Society for Analytical Chemistry

雑誌

Analytical Sciences (ISSN:09106340)

巻号頁・発行日

vol.22, no.1, pp.81-86, 2006 (Released:2006-02-24)

参考文献数

27

被引用文献数

6 10

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A rapid and sensitive immunoassay for the determination of vitellogenin (Vg) is described. The method involves a sequential injection analysis (SIA) system equipped with an amperometric detector and a neodymium magnet. Magnetic beads, onto which an antigen (Vg) was immobilized, were used as a solid support in an immunoassay. The introduction, trapping and release of magnetic beads in an immunoreaction cell were controlled by means of the neodymium magnet and by adjusting the flow of the carrier solution. The immunoassay was based on an indirect competitive immunoreaction of an alkaline phosphatase (ALP) labeled anti-Vg monoclonal antibody between the fraction of Vg immobilized on the magnetic beads and Vg in the sample solution. The immobilization of Vg on the beads involved coupling an amino group moiety of Vg with the magnetic beads after activation of a carboxylate moiety on the surface of magnetic beads that had been coated with a polylactate film. The Vg-immobilized magnetic beads were introduced and trapped in the immunoreaction cell equipped with the neodymium magnet; a Vg sample solution containing an ALP labeled anti-Vg antibody at a constant concentration and a p-aminophenyl phosphate (PAPP) solution were sequentially introduced into the immunoreaction cell. The product of the enzyme reaction of PAPP with ALP on the antibody, p-aminophenol, was transported to an amperometric detector, the applied voltage of which was set at +0.2 V vs. an Ag/AgCl reference electrode. A sigmoid calibration curve was obtained when the logarithm of the concentration of Vg was plotted against the peak current of the amperometric detector using various concentrations of standard Vg sample solutions (0 - 500 ppb). The time required for the analysis is less than 15 min.

著者

Koji Nakano

出版者

Global Business Research Center

雑誌

Annals of Business Administrative Science (ISSN:13474464)

巻号頁・発行日

pp.0191220a, (Released:2020-03-10)

参考文献数

15

被引用文献数

2

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This paper reexamines product development in the Japanese electrical industry after WWII from the perspective of strategies for reducing licensing costs. Immediately after the war, Japanese electronics manufacturers raised their own level of technology by introducing technology from abroad. However, in their effort to arrive at corporate policies enabling them to provide products at as low a price as possible, there was a limit to the sheer amount of licensing costs they could bear to carry out licensed production. Japanese electronics manufacturers, in many cases, engaged in cross-licensing based on their own patents in order to offset licensing fees and keep costs down. To further control licensing costs, manufacturers had no choice but to produce products based on licenses already in hand; each electronics manufacturer established a central R&D laboratory. Up until the early 1990s, “Not Invented Here” was a widely adopted philosophy which, as it turns out, was a historically unique approach.

著者

Koji Nakano Toru Ohara

出版者

Global Business Research Center

雑誌

Annals of Business Administrative Science (ISSN:13474464)

巻号頁・発行日

vol.18, no.2, pp.75-84, 2019-04-15 (Released:2019-04-15)

参考文献数

8

被引用文献数

2

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Japan has since ancient times had a custom called omiai (loosely translated as “matchmaking” when searching for a marriage partner). The examples of the matching of large firms and start-ups at the Innovation Leaders Summit in Japan discussed in this paper can truly be called “omiai.” Unlike Western-style matching, in this summit, participating firms and managers alike have little experience with alliances, and matchmakers have no strong commitment, as noted by Holzmann, Sailer, and Katzy (2014). Instead, just as with omiai, matchmakers exchange profiles of large firms and start-ups new to alliances and simply create a place for them to meet and make matches.

著者

Takumi Honda Yasuaki Ito Koji Nakano

出版者

IJNC Editorial Committee

雑誌

International Journal of Networking and Computing (ISSN:21852839)

巻号頁・発行日

vol.7, no.1, pp.69-85, 2017 (Released:2017-02-07)

参考文献数

20

被引用文献数

1

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The main contribution of this paper is to present an implementation that performs the exhaustive search to verify the Collatz conjecture using a GPU. Consider the following operation on an arbitrary positive number: if the number is even, divide it by two, and if the number is odd, triple it and add one. The Collatz conjecture asserts that, starting from any positive number m, repeated iteration of the operations eventually produces the value 1. We have implemented it on NVIDIA GeForce GTX TITAN X and evaluated the performance. The experimental results show that, our GPU implementation can verify 1.31×1012 64-bit numbers per second. While the sequential CPU implementation on Intel Core i7-4790 can verify 5.25×109 64-bit numbers per second. Thus, our implementation on the GPU attains a speed-up factor of 249 over the sequential CPU implementation. Additionally, we accelerated the computation of counting the number of the above operations until a number reaches 1, called delay that is one of the mathematical interests for the Collatz conjecture by the GPU. Using a similar idea, we achieved a speed-up factor of 73.