Yoichi Hagiwara

A traffic identification method and evaluations for a pure p2p application

Pure P2P applications are widely used nowadays as a file sharing system. In the overlay networks, music and video files are the main items exchanged, and it is known that the traffic volume is much larger than that of classical client/server applications. However, the current status of the P2P application traffic is not well known because of their anonymous communication architectures. In particular, in cases where the application does not use the default service port, and the communication route and the shared file are also encrypted, the identification traffic has not been feasible. To solve this problem, we have developed an identification method for pure Peer-to-Peer communication applications, especially for traffic for Winny, the most popular Peer-to-Peer application in Japan, by using server/client relationships among the peers. We will give some evaluation results for our proposed identification method.

Field investigation of the radio transmission performance and distance in a environmental wireless sensor network

One of the problems affecting sensor networks in natural environments is the attenuation of radio waves due to high humidity. This attenuation is greatest in the case of a 2.4-GHz radio wave. A system is being developed that uses a transmission control method to estimate communication environment fluctuations caused by changes in the natural environment. This paper discusses the transmission performance in wireless sensor networks in terms of the relationships between wireless transmission performance, distance, and environmental conditions observed in field experiments. Measurements were made with sensor nodes equipped with a weather-sensing device at an experimental field of the university, called the Field Museum (FM) Tamakyuryo in Tokyo. Over the course of the two-month experiment, measurements of the parameters throughput, signal strength, humidity, and atmospheric pressure were taken in the field. The results confirmed that the distance between sensor nodes and the season of measurement affect the throughput and stability of data transmission. Therefore, it is suggested that node position, distance between nodes, and environmental conditions are important factors in improving transmission performance and battery efficiency for environmental wireless sensor networks.

Low-cost managed digital signage system with signage device using small-sized and low-cost information device

The Digital Signage Systems using some computer devices are widely used for displaying some dynamic information, unlike wall ads that are unchanged for a certain period. At the replacement time of our universitys digital signage system, we need to implement cost effective digital signage system. Therefore, we developed a brand-new style of the digital signage display device using low-cost information device and open intensive management system. In this demonstration, we introduce the total signage system, that include 1) the signage display device, and 2) the digital signage device / content management system.

Brand New Designed Virtual Computer Classroom in BYOD era

In Tokyo University of Agriculture and Technology, by the part of the information strategy, we promote to abolish the conventional computer room, and make the user to bring the users own computer (BYOD: Bring Your Own Device). The trend of this BYOD is expanding progressively in other universities in Japan. The type of users device is wide variety, its usability, is too. In this situation, it increases the cost of teacher due to the difference of the operation. To reduce this cost, we propose our brand new designed computer environment, TUAT Virtual Computer Classroom (TUAT-VCCr). TUAT-VCCr is based on virtual desktop technology, and each user can use the TUAT-VCCr by accessing to the remote desktop, which can be accessed from everywhere in our campus. TUAT-VCCr can be used through an HTML5-compliant web browser (e.g. Google Chrome, Mozilla Firefox), instead of the dedicated client in a conventional VDI or remote desktop environment. This enables the use from a variety of access device that are independent of the device type of the user (e.g. Windows, Mac, Linux, or Chrome). As a result of this, convenience for the user is significantly improved. We present the detail of the design and structure of TUAT-VCCr architecture. We also provide a TUAT-VCCr reservation system, which can adopt the class schedule in order to manage the number of the virtual desktops for class and self-study use efficiently. We also present the detail of this reservation system.

Cost effective digital signage system using low cost information device

Digital signage systems that include some computer devices are widely used for displaying some dynamic information, unlike wall ads that are unchanged for a certain period. At the replacement time of our universitys digital signage system, we need to implement cost effective digital signage system. Therefore, we developed a brand-new style of the digital signage system using low-cost information device. In this demonstration, we introduce two prototype systems, 1) the signage display device, and 2) the central digital signage management system, which is now in implementing.

Field experiments for developing transmission control based on weather estimation in an environmental wireless sensor network

One of the problems affecting sensor networks for natural environments is the attenuation of radio waves due to high humidity, and the attenuation is worst in the case of a 2.4 GHz radio wave. We are developing a transmission control method that estimates communication environment fluctuations caused by changes in the natural environment. This paper discusses a transmission performance in wireless sensor networks in terms of correlations between wireless transmission performance and environmental conditions observed in filed experiments. Measurements were made with sensor nodes equipped with a weather sensing device at an experimental filed of the university, Field Museum (FM) Tamakyuryo in Tokyo. During a one-week experiment, measurements of some parameters, a Throughput, signal strength, humidity, and atmospheric pressure were taken in the field. The results confirmed that increasing humidity definitely decreased the throughput. Temporal changes of the atmospheric pressure during the ongoing measurements will foresee short-term weather changes, which would enable to keep the transmission in control under the foreseen weather conditions.

New high-definition videoconference system for remote lectures connecting 18 National Universities in Japan

This paper describes construction of a high-definition videoconference system which is connected 18 National Universities. This system is supported two screens with high-definition, to provide videos and sounds in high quality. We can operate a videoconference device, high definition camera, audio and video equipment (an audio amplifier and data projectors, etc.) from a wireless touch panel. A wireless touch panel is connected to an administration system of reservation through a network. This system can reduce a burden of a user, because the user can use it with simple operation for reservation from Web, and a system starts automatically in reservation time and sets it. This system is a beginning in Japan, as for the remote lecture using a high-definition picture connected Japanese universities from the north to the south.

Secure Campus Network System with Automatic Isolation of High Security Risk Device

In recent years, there are many problems of network security such data breaches and unauthorized access due to targeted attacks on vulnerabilities. The campus network in a university is under various threats as well as corporate networks. In addition, many universities including the Tokyo University of Agriculture and Technology (TUAT) have taken Bring Your Own Device (BYOD), and the number and types of devices connected to our campus network are increasing. Since a campus network is used for wide range of education and research, there are many more types of connected devices than corporate network. Until now, we tried to reduce the security risk for our campus network by using the quarantine / authentication system, but it is not a sufficient system because some users bypass the quarantine using the systems loophole. Therefore, we designed a campus network security system based on automatic shutdown with network monitoring for brand-new security measures of our campus network. In our system, network traffic is monitored on the campus network side (e.g. core switch, edge switch), and a device considered as high security risk is automatically isolated from the campus network on the edge switch. A dedicated portal is also provided for presenting the reason for isolating to the user. This can make it possible to effectively implement high levels of security measures while reducing the management cost for an operation and a user support as much as possible. In this presentation, we introduce details of the design and actual architecture of our system.

First Year's Efforts and Operational Results of BYOD Action in TUAT with New Style Virtual Computer Classroom

In April of 2016, Tokyo University of Agriculture and Technology (TUAT) transitioned from an educational computer system to Bring Your Own Device (BYOD). In response, a brand-new computer system for the classroom, called TUAT Virtual Computer Classroom (TUAT-VCCR), replaced the old computer rooms and terminals. TUAT-VCCR is based in virtual desktop technology and users can access the tools with any HTML5-compliant web browser (e.g. Chrome, Firefox), removing the differences for various operating systems (e.g. Windows, macOS). In this article, we would like to share our efforts and operational reports for our first year. The project itself included redesigning lecture halls, creation of user guides and other ways to support users to efficiently use new system. We would also like to share the first year adoption experience and the reality of BYOD in the university of science and technology. In this article, we provide valuable information to other organizations planning a similar BYOD initiative.

A New Design of an Automated Remote Lecture System in Japanese 18 Universities in 2015

In this paper, we describe a new design of an automated remote lecture system in Japanese national 18 universities. Our current high-definition automated remote lecture system that was constructed in 2009 has many life-expired hardware. Thus we design a new remote lecture system for replace current system. In our design, new system controls room equipment automatically by reservation, connects rooms and mobile environment seamlessly. The designed system is expected to build actually with the goal of full-scale operations in 2016.