- My current major research area is 3D printing. A position paper on this R&D was recently published. Several other papers are also being published.
I recommend you to select pages from the right-side categories in this page. Try some categories interesting for you. Each category page has an explanation and information for navigation. If you want to see whole blog, you can click the "ARCHIVES" title or look at the per-month archives.
To keep the page light, I exclude photos in individual pages from the archive page. Instead, I inserted some of them here.
I attended the SFF Symposium of this year and found that there were several presentations that focused on Printrbot, a 3D printer make. Printrbot was the first 3D printer that I built up from a kit. I found several design defects that causes my much labor. When I see what they have done since then, they seem to be mindless of users convenience. However, Printrbot seems to be still popular among much increased types of 3D printers. I do not understand the reason why so.
I made a business trip to Washington DC for a demo in 22nd GENI Engineering Conference (GEC 22). I explained a newly developed protocol called IPON.
I happened to look at a page in YouTube, and wrote a comment. The video is on Tchaikovsky's Violin Concerto played by Sayaka Shoji.
This video shows the facial expressions of the violinist very well. She shows both her emotion and technical issues. She seems to synchronize her performance with the orchestra by looking at the conductor (and probably by communicating with him). It is difficult to see such expressions in concerts.
By using a 3D printer in unusual way, interesting randomized "CA-like" patterns are generated (see this video). When the grids are relatively sparse, filament sometimes stacks regularly and sometimes stacks randomly.
By using a 3D printer in unusual way, interesting randomized "CA-like" patterns are generated (see this video). Sparse and more fluctuated patterns are generated when extruded less filament, and dense and more regular patterns are generated when extruded more filament.
A video on "Randomized shape creation with fluctuating 3D printing process" was submitted to YouTube. The title is "Creating naturally-fluctuated patterns using a 3D printer".
I assembled a 3D printer called “Printrbot Plus”. Lazer-cutted wooden parts are in plywoods. The plywoods contains many crosses.
Ethernet has been said to be a data-link layer protocol. It is true that Ethernet has data-link layer functions. However, it also has network-layer function, i.e., addressing. Therefore, if a network-layer protocol such as the internet protocol (IP) is used over Ethernet, the network-layer function is doubled. This causes protocol complexities, so I think this is a problem to be solved.
Sometimes I have to look at US patends. In such oppotunities, I usually look at the Web site of the US Patent Office first. However, when I look at patent descriptions, I need a TIFF viewer. Every time I want to do so, I fail to look at them! Why do they use unusable TIFF?!
I started a new trial “axis-specified” search service for Japanese version of Wikipedia yesterday. This service was announced in Japanese blog pages such as “Wikipedia 「軸づけ」 検索のインターネット上でのサービスをめざして”.
Father of President Obama was an African. Obama is not only Amarican African, but he is tightly connected to Africa, especially to Kenんa. The United States, of course, has been pay attention to African affairs. However, the presidents of the US seemed less attention to Africa than other areas in the world. So, I want to say "let there be light to Africa"!.
Relational databases are widely used. However, it is not very clear how queries written by SQL are executed by the DBMS. Don't you think we can understand the execution mechanism better by simulating the query execution using a procedural language?
I tried to translate some SQL queries into Perl programs. Although there are many methods to implement a join operation, I tried only one. However, I could implement an optimized join within 20 lines of Perl code, and I recognized the power of Perl again.
I wrote that I received an inquiry from a French on “Programming Linguistics” that I proposed in my graduate thesis in a blog article titled “Linguistics of programming languages ― now an inquiry on my graduate thesis came from France”. Yesteday I received another inquiry from a Japanese, and I searched for related work. As I wrote in the above article, there have been a few studies on programs regarded as human-written linguistic expressions. However, in this time, I found a paper by Masaru Ohba and Katsuhiko Gondow, which analyzes the strudture of identifiers.
In 1981, I chose “linguistics of programming languages” or “programming linuistics” for the theme of my graduate thesis. This was a trial to analyze programming languages by using the methodology of linguistics (of natural languages). I wrote a brief introduction to this work on a Web page in English. A scientist looked at this page and wanted to introduce this work in a tutorial in a workshop. So I wrote another Web page that contain an English abstract and contents. Because I wanted to introduce this paper since I started this blog, I try to write on this topic here. [The Japanese version of this page was written in September 2007, but I translated it to English in June 2008.]
As I wrote in a blog entry titled "Unifying hobby (play) and job" (sorry but currently available only in Japanese), the border between hobby (play) and job is not clear for me. This means, I do not know well how I should call it.
The Schönberg Center in Austria uploaded fragments of Arnold Schönberg's piano concerto performed by Mitsuko Uchida and a mixture of her talk and performance of the concerto to YouTube. I did not know Uchida had played Schönberg's concerto, but now I know there is a CD (Universal, UCCP1016). The talk is in English and I have not yet understood whole, but I could know how Uchida grasped Schönberg's music, and I was very interested.
The Schönberg Center in Austria uploaded tens of performance videos of Arnold Schönberg's music and documentary videos to YouTube. Most of the music performances are fragments, but some short pieces are completely included in the videos. "A Survivor from Warsaw" conducted by Holst Stein and "talked" by Herman Prei (by sprech-gesang) is a valuable video to be listened. Not only the performance but also the recording and the images are good.
Objects printed by using the new direction-specified design and printing technology are sold in Dasyn Yahoo! Japan shop.