The donation from IEEE-ISAS2011 participants to the East Japan great earthquake and tsunami orphan fund was sent to the ASHINAGA funding organization.
Thank you very much for your great contributions.

Naoaki Yamanaka
Graduate School of Science and Technology
Keio University

Please see Global COE program of Keio Univ. Website about details.

Ms. Yonezu’s paper regarding with energy efficient network MiDORi was accepted for journal of IEICE．

Title:Energy Optimal Topology Calculation Method for Self Organized Network MiDORi
Authors: Haruka Yonezu, Daisuke Ishii, Satoru Okamoto, Eiji Oki, and Naoaki Yamanaka
Abstract: In order to reduce the energy consumption of transport/data center networks, MiDORi network technology is introduced. This network is based on the concept of aggregating traffic into specific links, and powering off interfaces of routers/switches that do not convey traffic. In this paper, a practical energy-optimal topology calculation method is proposed for the MiDORi PCE. The proposal can adjust the link reduction rate and the calculation time by setting different values for the depth. Moreover, two failure management methods are proposed in order to reduce the risk of traffic aggregation. By computer simulation, it is shown that the proposed method is effective from several perspectives. Lastly, a prototype system of MiDORi network is described to observe the aspect of self organization.

Mr. Yamada’s paper regarding with TCP/IP over SCTP/IP Parallel Networking with Parallel Routes Transmission
was published in journal of IEICE.

Title:Performance evaluation of TCP/IP over SCTP/IP Parallel Networking with Parallel Routes Transmission
Authors: Shota YAMADA Daisuke ISHII, Satoru OKAMOTO, and Naoaki YAMANAKA
Summary: In this paper, Transmission Control Protocol/Internet Protocol (TCP/IP) over Stream Control Transmission Protocol (SCTP)/IP parallel transmission system is proposed to realize large TCP/IP throughput over parallel transmission.
The proposed system is implemented on the software switch to evaluate parallel transmission performance. The evaluation results indicated that the proposed system can achieve 90% throughput compared with the serial transmission when the delay difference among parallel routes is 20 msec.

Japanese magazine “OPTCOM” (issued in August) picked up about “a self organized energy efficient network MiDORi” as a special report in the energy efficient network.

Yamanaka Lab. focuses on a self-organizing energy saving network which realizes the most energy-efficient network topology automatically based on traffic volume monitored at network devices, Generalized Multiprotocol Label Switching (GMPLS) automatic path control protocols, and Path Computation Element (PCE) energy optimal path computation system.
When traffic volume is low, MiDORi network system makes as many links as possible idle by aggregating traffic. The idle links are power shut down for energy saving.
The experimental network consists of commercially produced Ethernet switches (Alaxala AX6700S), green Ethernet switches developed by Keio Univ. which is now selling by AllGreen Networks Inc., and an energy saving network topology calculation system.
By adopting this self-organizing energy saving network system, about 61 percent link reduction is expected in the 100 nodes topology network.

This work is supported by PREDICT program of the Ministry of Internal Affairs and Communications (MIC) of Japan.

Mr. Shimada made presentations at Technical Committee on Photonic Network (PN) in June 23-24.

The titles and authours are as follows.

Authors: Yuji Shimada, Takehiro Sato, Kunitaka Ashizawa, Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto, Eiji Oki, Naoaki Yamanaka
Title： Recently,the power consumption of Internet is increasing rapidly. Thus,we have been proposing an optical aggregation network,which reduces the power consumption of today’s Internet greatly. The optical aggregation network connects solitary giant router and thousands of users in transparent 1-hop network. This research proposes new dynamic bandwidth allocation. The propose scheme groups ONUs by considering their distances from OLT (Optical Line Terminal), and calculates their bandwidth allocated to one group while other groups are sending data to OLT. Evaluation shows the proposed scheme achives high bandwidth utilization.

Dr. Okamoto recieved a letter of appreciation from IEICE.

His dedicated activity contributing to journal invigoration in the IEICE Communications Society Journal Editorial Committee was rewarded.
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Mr.Hara’s paper was selected as an award-winning paper of IEEE-ISAS2011.

Title and Auther are bellow.

Title: A Study of Next Generation Metro-Access Hybrid Scalable Network

by Using PLZT Ultra High Speed Optical Wavelength Selective Switch

Authors: Yutaro Hara, Takehiro Sato, Yuji Shimada, Kunitaka Ashizawa,Kazumasa Tokuhashi, Daisuke Ishii, Satoru Okamoto and Naoaki Yamanaka

It will present him at the awarding ceremony that will be held during the Banquet of IEEE-ISAS2011 on Saturday, June 18.

Mr. Ashizawa’s paper regarding with multicast using PLZT optical witch is accepted for Cyber Journal as follows.

Title: On-Demand Multicast Slot Allocation Scheme For Active Optical
Access Network Using PLZT High-Speed Optical Switches
Special Issue: Journal of Selected Areas in Telecommunications (JSAT)
Author(s): K. Ashizawa, T. Sato, K. Tokuhashi, D. Ishii, S. Okamoto, N.
Yamanaka, E. Oki

Abstract:
This paper proposes an on-demand multicast slot allocation scheme for an
active optical access network that uses Mach-Zehnder-type high-speed
optical switches, which are achieved by the Plumbum Lanthanum Zirconate
Titanate (PLZT) switching technology. The Active Optical Network, called
ActiON, is based on slot-based switching. Compared to the Passive
Optical Network (PON), ActiON quadruples the number of subscribers (128
users) per optical line terminal (OLT) and doubles the maximum
transmission distance (40 km) between OLT and optical network units
(ONUs). However, as ActiON uses slot-based switching, it needs a large
number of slots to deliver multicast contents to the requesting users.
This greatly lowers network utilization rates. The proposed multicast
slot allocation scheme overcomes this problem to provide on-demand
multicast services, while keeping the advantages of ActiON. Multicast
delivery is realized by running the Mach-Zehnder-type high-speed optical
switch elements in distribution mode, which forces the switch to behave
as an optical splitter. The proposed scheme iteratively solves the
integer linear programming (ILP) problem to associate multicast users
with slots. Numerical results show that the proposed scheme dramatically
reduces the required number of slots, compared to non-multicast ActiON
and provides comparable the performance of bandwidth efficiency to 10 G-
EPON, and the required computation time of the proposed scheme is less
than 0.3 sec, which is feasible for on-demand services.

Members of Yamanaka Labs. will make presentations on International Symposium at Access Spaces (ISAS) 2011 on 17-19 June 2011.
Members are as follows: Dr. Takenaka, Mr. Sato, Mr. Matsumoto, Mr. Shimada and Mr. Nomura.
The Subjects and the detailed time-line are seen at IEEE-ISAS 2011.

Miss Hirao got “Koizumi taiiku doryoku” award.

This prize is given to students who belong in official sports club of Keio.

Miss Hirao belongs in a “shorinji kempo” (one of Japanese martial arts) club.
She won the first prize in All Japanese students competition of Shorinji kempo last year and got this award.

We are so happy that the student in Yamanaka laboratory got such prize at once.
We wish she will continue to enjoy her great success.