Prof. Won-Yong Shin from Dankook University visited our laboratory who is an ex-colleague of Prof. Ishibashi at Harvard university. He gave us an exciting and impressive talk and shared his recent results with us. The title and abstract of his talk were as follows:

Title : Huge Challenges on Twitter Analytics Using Geolocation
Abstract : Research in the field of online social networks (OSN) has grown dramatically with the evolution of technologies while harvesting Big Data. Twitter is one of the most popular micro-blogs (or social media). In this talk, I’m going to briefly explain how to perform data collection and processing from the Twitter network via Twitter Streaming API. Next, I’m going to show two recent results analyzed based on geo-tagged tweets. First, I characterize a newly discovered friendship degree according to geographic distance by introducing a new definition of “bidirectional friendship”. The study demonstrates the fact that  the number of friends according to distance follows a double power-law (i.e., double Pareto law) distribution. Second, I introduce a low-complexity algorithm that detects a “point-of-interest (POI)” boundary. Detected boundaries are shown along with a variety of POI types, and it is verified that the runtime complexity scales linearly with the input size. 

Shun Ogata, our member, gave a presentation entitled “Frameless ALOHA with Multiple Base Stations” at 49th Asilomar conference on signals, systems and computers held at Asilomar Conference Grounds, CA, the United States on Nov. 9th.

11月9日，米国Asilomar Conference Groundsで開催された49th Asilomar conference on signals, systems and computerにおいて，M2尾形駿君が”Frameless ALOHA with Multiple Base Stations”と題して発表を行いました．

東北出身の学生達の企画によるAWCC芋煮会が開催されました。

We had a IMONI party arranged by students from the Tohoku region of Japan. IMONI is a thick potato and meat soup eaten traditionally in the autumn in the Tohoku region of Japan.

Our two papers about RF energy harvesting and spatial modulation, respectively, are ranked in the latest IEEE Wireless Communication Letters Popular Articles (September 2015).

IEEE Wireless Communication LettersのPopular Articles (September 2015)に，RFエナジーハーベスティングおよび空間変調に関する論文2本が，それぞれランクインしました（28位，33位）．空間変調の論文は18ヶ月連続のランクインとなります．

http://ieeexplore.ieee.org/xpl/topAccessedArticles.jsp?punumber=5962382

Our paper “A Simple Random Access Scheme with Multilevel Power Allocation” has been accepted for publication in the IEEE Communications Letters.

9月17日から19日の3日間、山尾研究室・藤井研究室と合同で菅平セミナーハウスにてAWCC合同合宿を行いました。

Our paper “Diversity-Multiplexing Tradeoff of Dynamic Harvest-and-Foward Cooperation” has been accepted for publication in the  IEEE Wireless Commun. Lett, which was co-authored with Prof. I. Krikidis and Dr. C. K. Ho.

Our paper entitled “Frameless ALOHA with Multiple Base Stations” has been accepted to Asilomar’15 will be held at Asilomar Conference Grounds, CA.

The program is available at the following website:

http://www.asilomarsscconf.org/webpage/asil15/AS15_AdvanceProgram_v007_Book.pdf

Prof. Ioannis Krikidis from Cyprus visited our laboratory on 15th July and we fully enjoyed fruitful discussions.