IRTF H. Baba
Internet Draft The University of Tokyo
Intended status: Informational Y. Ishida
Expires: September 10, 2016 Japan Internet Exchange, Co. Ltd.
T. Amatsu
Tokyo Electric Power Company
K. Kunitake
BroadBand Tower, Inc
K. Maeda
Lepidum Co. Ltd.
MAR 10, 2016
Problems in and among industries for the prompt realization of IoT
and safety considerations
draft-baba-iot-problems-01.txt
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Abstract
This document contains opinions gathered from enterprises engaging in
the IoT business as stated in the preceding version hereof, and also
examines the possibilities of new social problems in the IoT era.
Recognition of the importance of information security has grown in
step with the rising use of the Internet. Closer examination reveals
that the IoT era may see a new direct physical threat to users. For
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instance, the situation at a smart house may lead it to judge that
the owner has only temporarily stepped out, causing it to unlock the
front door, which in turn makes it easier for thieves to enter. These
kinds of scenarios may occur without identity fraud, hacking, and
other means of compromising information security. Therefore, for the
purpose of this document, this issue shall be referred to as "IoT
Safety" to distinguish it from Information Security.
We believe that it is necessary to deepen our understanding of these
new IoT-related threats through discussion and ensure there are
measures to address these threats in the future. At the same time, we
must also coordinate these measures with the solutions to the
problems described in the previous version of this document.
Table of Contents
1. Introduction ................................................. 4
2. Technical challenges ......................................... 5
2.1. Safety, Security and Privacy ............................ 5
2.1.1. Challenges in protecting lives and property from IoT-
related threats (IoT Safety) .............................. 5
2.1.2. Information Security ............................... 6
2.1.3. Privacy in acquiring data .......................... 7
2.2. Challenges posed by data acquisition, data distribution, data
management and data quantity ................................. 7
2.2.1. Traffic patterns ................................... 7
2.2.2. Acquired mass data ................................. 8
2.2.3. Explosive increase and diversity of data ........... 8
2.3. Mapping of the physical world and the virtual world ..... 9
2.3.1. Physically handling acquired data .................. 9
2.3.2. Data calibration ................................... 9
2.4. Product lifetime, generation management, and the cost of
equipment updates ............................................ 9
2.4.1. Product lifetime ................................... 9
2.4.2. Introducing IoT equipment into commodity equipment 10
2.5. Too many related standards and the speed of standardization10
2.5.1. Too many related standards ........................ 10
2.5.2. Speed of standardization .......................... 10
2.6. Interoperability, fault isolation, and total quality
assurance ................................................... 11
2.6.1. Interoperability .................................. 11
2.6.2. Fault isolation ................................... 11
2.6.3. Quality assurance ................................. 11
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2.7. Product design policy .................................. 12
2.7.1. Changes in design policy .......................... 12
2.8. Various technology restrictions within actual usage .... 12
2.8.1. Using radio waves ................................. 12
2.8.2. Batteries ......................................... 13
2.8.3. Wiring ............................................ 13
2.8.4. Being open ........................................ 13
3. Non-technical challenges .................................... 14
3.1. Changing the product paradigm .......................... 14
3.1.1. Ecosystems......................................... 14
3.1.2. Coordination and significant changes in strategy .. 14
3.2. Benefits ............................................... 15
3.2.1. Rising costs and monetization ..................... 15
3.3. Information security and privacy of social systems ..... 15
3.3.1. Classification of ownership, location, and the usage of
data ..................................................... 15
3.4. Disclosure of data ..................................... 15
3.4.1. Side effects and malicious use potentially caused by the
disclosure of data ....................................... 15
3.5. Preparing social support ............................... 16
3.5.1. Regulations ....................................... 16
3.5.2. Corporate social responsibility ................... 16
3.5.3. Customization for individual customers ............ 16
3.5.4. IoT literacy of the users ......................... 16
3.5.5. Individual vs. family. ............................ 17
4. Information Security Considerations ......................... 17
5. Privacy Considerations....................................... 17
6. Acknowledgments ............................................. 17
1. Introduction
Many activities are progressing in various fields, such as the
proposal of standards for creating an IoT world. There are also many
reports that analyze and predict the benefits that IoT can bring to
the economy and society. These developments remind us of the end of
the 20th century, when the effect and impact of the Internet was
actively debated.
The authors tried using the following approach to clarify the issues
for the prompt realization of IoT. First, the players were
conveniently divided into two groups: ICT industry players and Things
industry players. Next, we met major players in the ICT industry and
Things industry and asked about the challenges they faced and the
challenges the other side faced in creating IoT.
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The ICT industry players mentioned here include communication
carriers, ICT equipment vendors, the Internet service providers,
application vendors, and software houses. The Things industry players
include home and housing equipment manufacturers, infrastructure
providers such as railways companies and power companies, and
manufacturers of home appliances such as air conditioners and
refrigerators, which are also the ICT users.
This paper is principally a summary of the meetings results, and a
presentation of the micro case studies about the challenges for
realizing IoT services. It is not an overview of the IoT world or a
macro-proposal intended to promote the benefits of IoT.
In addition, the revised version includes an examination of the
possibilities of new direct physical threats in the IoT era that have
not yet been seen. These threats should affect the safety of our
bodies, lives, and "things," which includes property. For this reason,
this issue shall be referred to as "IoT Safety" to distinguish it
from Information Security for the purpose of this document.
2. Technical challenges
2.1. Safety, Security and Privacy
2.1.1. Challenges in protecting lives and property from IoT-related
threats (IoT Safety)
The introduction of IoT may generate threats to "Safety" through the
actual operation of mechanical devices, in addition to the
Information Security problems discussed in 2.1.2 below. For example,
the spread of applications for visualizing electric power consumption
allows for mischief in device operation without the use of identity
fraud or hacking. In addition, there is the potential for problems to
arise in the normal operation of individual devices that are not
caused by abnormal current or voltage, another troubling aspect of
the introduction of IoT.
These threats are categorized into three types: threat to physical
safety; the threat of the failure or destruction of equipment and
property; and the threat of impeding the proper performance of
equipment. The following section introduces examples of the different
threats.
2.1.1.1. Safety of body/life
Information on things such as the use of faucets and housing
equipment, the locking of the front doors and windows, and the state
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of electric power consumption based on the smart meter is used by
smart houses to regulate homes. This information is used to determine
whether anyone is at home, and the electronic lock of the front door
and windows is unlocked and a notice of absence is issued to a thief.
2.1.1.2. Safety of equipment
Air conditioners and other equipment that normally are not expected
to be frequently started or stopped each a day can be caused to break
down by repeatedly turning them on and off as many as hundreds of
times a day.
2.1.1.3. Proper performance of equipment
Water heaters containing a hot well can be caused to operate
erratically. This is done by frequently transmitting signals from the
mischief application instead of operation panel to tell the water
heater that only 10% of the normal amount of hot water is needed,
leaving the water heater perpetually low on water.
2.1.2. Information Security
We have confirmed two viewpoints regarding the information security
of services using IoT equipment and devices. The first is tangible
information security involving the critical infrastructure. The
second concerns the information security of individuals and homes.
In regards to information security involving the critical
infrastructure, the basic policy in the past was to stay physically
disconnected from an external network, such as the Internet, to
ensure information security. However, because of the advance in the
systems from proprietary communication protocols to open IP protocols
to detect symptoms of problems and to remotely maintain a large
number of facilities spread over a wide area, connecting to an
external network will become unavoidable to achieve various goals. In
addition, it is clear that isolated networks are also subject to the
same kind of risks, even though it is not directly connected to the
outside. There is no major difference in the information security
risks because isolated networks are already the target of
international cyber terrorism, with internal crimes and targeted
attacks occurring more frequently. Based on these reasons, the ICT
security of the social infrastructure requires an extremely high
level of information security.
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Looking at the information security of micro units, such as
individuals and homes, the improved convenience provided by the
introduction of IoT will lead to greater risks. For example, there is
a product available for connecting the entrance door to the network.
In ICT security technology, increasing the key length of the
encryption makes it much harder to break. But even if the latest
information security technology is used when it is installed, the
information security technology will become obsolete and even pose a
risk about halfway through the twenty- to thirty-year lifetime of the
entrance door. As has been explained in other items, the ICT sense of
time is completely different from that of Things.
2.1.3. Privacy in acquiring data
The problem of privacy in handling acquired data is a huge challenge
for companies promoting IoT. In addition, the ownership of this data
poses yet another challenge.
For example, railway companies have installed many cameras for
station security and for marketing beverage vending machines. This
creates problems for personal identification and privacy. At the
present time, the companies are processing the images in real time
and do not store the images to avoid the problems.
Another huge challenge is the ownership of data. Up until now, there
has been a divided debate on whether data belonged to the company or
to the users. Likewise, the relationship inside a small user group is
also extremely diverse and complicated. One specific example is of a
company that had obtained permission from the head of the household
to use the data when it carried out an HEMS trial. Later on, the
spouse of the head of the household disagreed and as a result
permission to use the data was withdrawn.
2.2. Challenges posed by data acquisition, data distribution, data
management and data quantity
2.2.1. Traffic patterns
The manner in which data is acquired from and distributed to IoT
equipment/devices differs immensely from the traffic patterns of the
present Internet. The present form of the Internet focuses on
distributing information, and its systems focus on effectively
delivering contents to the users. On the other hand, routinely or
temporarily sending or receiving data through a huge number of
various sensors and devices presents a very different kind of
Internet traffic. However, questions such as how much traffic will
come from what kind of Things, and how will they superimpose each
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other have not been sufficiently studied. There is no concrete
explanation about the backbone design and operation of traffic, and
there have been many cases in which the unclear specifications for
IoT traffic made the design difficult on the communication company
side. There are many challenges related to the set up and management
of IoT equipment. We have heard from the construction companies that
the configuration of IoT equipment with a large number of sensors
involves a lot of hard work.
2.2.2. Acquired mass data
It is necessary to develop a management method to reuse acquired data
safely and effectively. Even now, there are occasional instances of
the theft and leakage of social data (such as IDs) that can be used
to identify individuals. In the IoT era, there will be mass data that
can lead to Things, and the Things in turn will lead to individuals.
There are IoT industry players who do not invest as much in ICT
systems as government agencies and large companies do, and thus a
management system to safely and effectively reuse the acquired data
needs to be developed. The laws and regulations related to ID
management differ vastly by country and region. These issues related
to society and individuals are largely affected by differences in
common sense, and therefore need to be localized.
2.2.3. Explosive increase and diversity of data
In the future IoT era, there are concerns about the explosive
increase in data quantity and the diversity of data sent from sensors
and IoT equipment. On the other hand, M2M communication does not
require mass data like images, and an extraordinary increase in
traffic will be unlikely despite the increase in the number of
sensors.
If data is sent from all Things, there will be an infinite number of
different kinds of data. In addition, with the present form of
Internet traffic, data is received by people, and most of it consists
of video or image downloads. The download traffic is several times
greater than that of the upload traffic. If there is a tremendous
increase in the use of IoT, such as M2M communication, the difference
between upload and download traffic will probably not be that much.
It might be necessary to fundamentally review the network and in
particular the last mile characteristics. The importance of this
issue is not yet widely recognized.
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2.3. Mapping of the physical world and the virtual world
2.3.1. Physically handling acquired data
The acquired data simply represents certain kinds of digital value,
and it is important to uncover the meaning of this data. As described
previously, configuration of IoT equipment, such as the large number
of installed sensors, requires a lot of hard work. An even greater
amount of effort will be needed to determine the meaning of the data
and connect it to the physical world.
In energy management experiments, data is mapped manually. This is a
time consuming process, and one that is prone to human error. Cases
that rely on the use of human hands require the configuration of
automated setting systems to reduce labor, costs, and human errors to
introduce IoT
2.3.2. Data calibration
Another important thing is calibration. This involves properly
linking the data sent from Things to the Things concerned, and
correctly indicating the operating conditions.
It may be necessary to have a tool to treat this problem concerning
continuation of operation and the one pertaining to introduction of
IoT described previously as a package.
2.4. Product lifetime, generation management, and the cost of equipment
updates
2.4.1. Product lifetime
The life of most ICT equipment is about 5 years or less, while the
life of IoT equipment and devices is at least 10 years. There is a
clear gap between these two types of equipment.
In the example of the entrance door connected to the network
mentioned earlier, the door is often used for about twenty to thirty
years after installed. If is connected to a network, the
communication technology and communication service will most likely
have undergone numerous generation changes in that twenty- to thirty-
year time span. This presents a large gap between the ICT industry
and the Things industry.
A solution to this problem that was reached during the meeting with
the housing equipment manufacturers is that with the automatic
control of multiple shutters in a building, the portion between the
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controller and the multiple shutters, the so-called mature technology,
can be placed under the control of the shutter manufacturers, while
the controller connected to the network will deal with the generation
changes of the communication service.
2.4.2. Introducing IoT equipment into commodity equipment
It costs a lot to make the many different types of commodity
equipment popular around the world usable as IoT equipment and
devices. There are two ways to change commodity equipment into IoT
equipment. One way is to convert it to IoT compatible equipment. The
other way involves adding devices to commodity equipment. There are
costs in both cases, and it will take a long time to introduce IoT
unless different incentives are offered to help to overcome the
burden of cost.
2.5. Too many related standards and the speed of standardization
2.5.1. Too many related standards
There are many standards related to IoT equipment and devices. There
are multiple standards, technologies and services for communication
technology, such as Bluetooth, Wi-Fi, NFC, and LTE, and it is
difficult to choose which to apply.
The Things industry players do not always have the communication
technology professionals needed for IoT. In the meeting, we learned
that many companies were uncertain and hesitant about fields outside
their own area of expertise. On the other hand, technological
competition will improve quality as well as the level of completion,
and thus will be beneficial for users.
In the future, a consulting business for clarifying ICT technology
for the Things industry players may emerge. If there is a system that
can interconnect multiple standards, it will accelerate the Things
industry to enter IoT
2.5.2. Speed of standardization
The concept of product life in ICT industry is completely different
from that of the Things industry, and as a result the concept of
standardization also varies greatly. Before standardization occurs in
the ICT industry, many different proposals are made, from which the
best are selected. The final decision often changes, and products
have to be updated in order to follow the changes in standards. But
in the Things industry, the standards have to remain unchanged for as
long as possible because of the long product lifetimes. Therefore, it
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takes a long time to determine when a particular standard has become
mature. When the Things industry goes to implement a standard from
the ICT industry, it feels that the standard is incredibly fluid and
seemingly undecided. Furthermore, the standardization process of the
two industries is very different, and making it difficult to work on
the other side when trying to determine a standard.
2.6. Interoperability, fault isolation, and total quality assurance
2.6.1. Interoperability
The verification of interoperability poses a major challenge because
of the configuration used by multi-vendors. In addition to
interoperability between equipment, the ability to ensure backward
compatibility is also important for bringing about the IoT world.
If these capabilities cannot be provided, it will be very difficult
to create an IoT world in which past products can function.
2.6.2. Fault isolation
The method for fault isolation that may occur presents another
challenge.
Many PC users have experienced various kinds of problems. When their
PC experiences a problem, they have to isolate the faults by
themselves, with no one available to lend a helping hand.
In the IoT world, these issues become more difficult and complicated.
For example, a smart home is equipped with air conditioners, kitchen
supplies, and doors connected to the Internet. A problem that occurs
in the smart home poses a much more serious problem to end users than
an e-mail failure or problem with a PC.
If users are left to isolate the fault on their own, they may not
know which manufacturer they contact for repairs if they are unable
to isolate the fault on their own, or the manufacturer may refuse to
perform repairs because they fall outside the scope of their
responsibility. As can be seen, the issue is an important challenge
that will determine whether the B2C specific IoT world can be
established.
2.6.3. Quality assurance
The quality assurance of individual pieces of IoT equipment does not
guarantee the total quality of IoT. Since IoT involves connecting
multiple Things and communication, it is natural to assume that the
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total service quality will depend on the quality of the IoT equipment
and devices, which can sometimes become bottleneck. However, users
are not aware of this.
As was mentioned previously in 2.6.2, issues that are not directly
related to the quality of an individual component can be important
factors in determining the quality of the service. In this way, the
quality of IoT is not decided by each individual Thing, but needs to
be considered as a service spread across the network.
2.7. Product design policy
2.7.1. Changes in design policy
The design policy has to be changed from placing emphasis on the high
functionality of a single product to stressing the singular function
of individual products as well as how they work in coordination with
other products. For many years, the Things industry has focused on
producing high functionality products with added value. But in the
IoT era, the implicit assumption is to confine Things to their basic
function and enhance the level of coordination between Things, rather
than focusing on the added value. Simplified Things must be able to
be controlled with an external application that can also be used by
the Things of cross manufacturers.
Given this situation, the Things industry faces the challenge of
adopting a completely different policy. During the meeting with the
manufacturing industries, we could sense their difficulty in
understanding and recognizing the need to change the policy.
2.8. Various technology restrictions within actual usage
2.8.1. Using radio waves
There are many cases that have provided us with insight about issues
related to the use of radio waves in IoT (such as the wave traveling
range and whether or not it travels further than stated in
assumptions available). The suppliers or providers who configure IoT
are not always wave communication technology experts. People who are
unfamiliar with radio waves seem to think that waves travel from
antenna to antenna in a straight line, and that they can be blocked
by obstacles. As a result, they often ask questions about how many
meters radio waves can travel or whether radio waves can actually
travel. Few people understand the fact that the emitted radio waves
are reflected from various locations and are superimposed at the
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reception point where they are received, or that depending on how
waves are reflected a change in the reception signal intensity,
called fading, may occur. The lack of engineers who can advise on
specialized matters such as these poses a major obstacle.
2.8.2. Batteries
The power capacity and lifetime of batteries represent another set of
challenges similar in nature to the issue of radio waves traveling
distance. There are questions such as the difference between the real
and catalog specifications, as well as factors that affect the
battery power capacity. The IoT providers, who are also users of IoT,
have to solve these issues, while these are difficult problems even
for experts.
2.8.3. Wiring
The incredible amount of wiring and its complexity (power lines and
communication lines) pose major challenges. The complexity of wiring-
such as the large number of sensors and equipment, the power lines
that drive them, and the communication lines that connect them to the
network for acquiring information-is to the point that people doing
IoT installation work will start wishing for a wire harness. In
addition, the installation of cables and electric work are often done
by different engineers. This make the issue even more complicated.
2.8.4. Being open
A single company alone cannot make all the commodities for IoT. The
IoT world needs to be open, and this can only be achieved with the
cooperation of many different industries. Up until now, companies in
the Things industry have developed products in a closed loop process,
seeking to capture users with their company's own products. For this
reason, they lack an open design concept of interoperability. Today,
an entirely new design concept is needed to design products that can
interconnect with the products of other companies.
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3. Non-technical challenges
3.1. Changing the product paradigm
3.1.1. Ecosystems
While the goal of setting up IoT is to generate new value, it may
actually lead to the destruction of the ecosystems in which
industries operate. In the IoT era, the traditional vertically
integrated way of producing Things in manufacturing industries will
consume too much time and cost. This approach also makes it difficult
to incorporate the ideas of other cultures. The need for paradigm
shift is easy to understand, but difficult to implement. Promoting
this shift will pose a management challenge that requires a
considerable amount of skill and effort to overcome.
3.1.2. Coordination and significant changes in strategy
It will become necessary to run businesses jointly with new partners,
as well as cooperate and work in coordination with other industries
and competitors. This issue-even when it is fully understood-will be
very difficult to address and put into practice.
We have seen instances in which only a limited amount of information
was given when parties exchanged opinions. There have also been
instances in which communication was difficult because of differences
in terminology and culture.
3.1.3. Competition with existing industries
The issue of competition with existing industries often arises when
attempts are made to change or reform a business model change or
reform. This issue can also be viewed as the reorganization of
industries, rather than competition between existing industries.
However, this realignment of industries is difficult to move forward
in the absence of supervisors.
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3.2. Benefits
3.2.1. Rising costs and monetization
Introducing IoT within products will cause costs to go up, and yet
the benefits it provides are unclear. There is no specific killer
application available, and the number of users will not rise
immediately. Therefore, finding a way to make the business profitable
will be very difficult. This issue is especially difficult for
businesses and products that rely on cost reductions to deliver low
prices that make them competitive.
3.3. Information security and privacy of social systems
3.3.1. Classification of ownership, location, and the usage of data
There are many questions regarding the wide variety of data gathered
from IoT equipment, including questions related to ownership, storage
location, and the authorization to grant a license to use data. These
need to be addressed so that the system and equipment can be accepted
by society.
For example, if a company installs a door in a house that gathers
data on the opening and closing of the door, questions about the data
will arise. Does it belong to the users or the company? Can another
company use this data?
3.4. Disclosure of data
3.4.1. Side effects and malicious use potentially caused by the
disclosure of data
The disclosure of data can expose individuals and society to risks.
For example, it has been shown that the electricity smart meter can
lead to burglary because it shows when electricity is used and not
used, providing an indication of the time when no one is home. This
particular example demonstrates the importance of ensuring
information security and privacy.
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3.5. Preparing social support
3.5.1. Regulations
Systems of laws and regulations are important for ensuring the safety
of the conventional products, but they can also be a barrier for
innovation.
IoT can be affected by laws and regulations at home and abroad, and
can also be influenced by regulations that extend across multiple
countries. Regulatory authorities need to monitor IoT carefully and
adjust the regulations and laws they oversee in a way that does not
negatively impact the global competition environment.
3.5.2. Corporate social responsibility
In addition to pursuing profit, companies that promote IoT also need
to improve the benefits offered to users and society
3.5.3. Customization for individual customers
There is an ongoing shift in demand away from general products to
customized products for individual customers. This could also be
viewed as a shift away from manufacturing businesses to service
businesses. IoT will play an important role in this shift.
Instead of manufacturing Things through mass production, it will be
easier to customize a product by moving some of the functions to an
application. Likewise, the manufacturing business also needs to move
forward with the previously mentioned paradigm shift in order to
achieve customization
3.5.4. IoT literacy of the users
Because Things are connected to the network, apps will need to be
created. Some of these will serve as the interface with which people
interact with IoT.
In the IoT era of the future, users will need to possess a certain
amount of knowledge about IoT apps
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3.5.5. Individual vs. family
The issue of whether the data of Things in the house belongs to the
family or the individual will largely affect data analysis and the
handling of privacy.
As was mentioned in 2.1.2, the spouse could later object to the head
of the household granting authorization to use data.
4. Information Security Considerations
Meetings with the players in various IoT fields provided insight into
information security issues. These issues are described in the
following sections.
* 2.1.1 Physical damper of devices
* 2.1.1 Product lifetime and encryption strength
For details, please see the corresponding text.
5. Privacy Considerations
Similarly, issues regarding privacy are described in the following
sections.
* 2.1.2, 3.3.1 Ownership of the data
* 3.4.1 Data disclosure and malicious use
* 3.5.5 Individual vs. family
For details, please see the corresponding text.
6. Acknowledgments
The foundation of for the promotion of industrial science funds
research group for IoT issues named RC-88. The RC-88 consists of both
ICT enterprises and manufacturers as follows;
- Nippon Telegraph and Telephone Corporation
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- Nippon Telegraph and Telephone East Corporation
- NTT Communications Corporation
- LIXIL Corporation
- Intel K.K.
- Japan Internet Exchange, Co. Ltd.
- Lepidum, Co. Ltd.
- Paloma Co.,Ltd.
- BroadBand Tower,Inc.
- KOZO KEIKAKU ENGINEERING Inc.
- Tokyo Electric Power Company
- Toshiba Corporation
- MITSUBISHI ELECTRIC CORPORATION
- Sharp Corporation
- Hitachi Ltd.
- NEC Corporation
- Panasonic Corporation
- The University of Tokyo
We thank companies such as railway company, electric power company,
ICT chip vender, medical equipment vender, etc. that answered our
questions willingly. We also thank Ministry of Internal Affairs and
Communications for their cooperation.
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Authors' Addresses
Hiroyuki Baba
Institute of Industrial Science, The University of Tokyo
4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
Email: hbaba@iis.u-tokyo.ac.jp
Yoshiki Ishida
Japan Internet Exchange, Co., Ltd.
19F KDDI Otemachi Bldg.
1-8-1 Otemachi, Chiyoda-ku, Tokyo, 100-0004, Japan
Email: ishida@jpix.ad.jp
Takayuki Amatsu
Tokyo Electric Power Company, Inc.
1-1-3 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-8560, Japan
Email: amatsu.t@tepco.co.jp
Koichi Kunitake
BroadBand Tower,Inc.
Uchisaiwaicho Tokyu Bldg.7F,
1-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo 100-0011, Japan
Email: kokunitake@bbtower.co.jp
Kaoru Maeda
Lepidum Co. Ltd.
#602 village Sasazuka 3
1-30-3 Sasazuka, Shibuya-ku, Tokyo 151-0073 Japan
Email: maeda@lepidum.co.jp
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