January 2018 Vol. 16 No. 112018

https://www.ntt-review.jp/archive/2018/201801.html

View from the Top
Hiromichi Shinohara, Senior Executive Vice President
and Head of R&D Strategy Department, NTT

Front-line Researchers
Hiroshi Sawada, Senior Distinguished Researcher, NTT
Communication Science Laboratories

Feature Articles
Research and Development ofLife-cycle Maintenance ofTelecommunication Infrastructure
Direction of Research and Development of Life-cycle
Maintenance
Automatic Deterioration Evaluation Technique to Improve
the Efficiency of Manhole Inspection
Accelerated Corrosion Test for Evaluating the Corrosion
Resistance of Coatings
Risk Assessment of Outdoor Telecommunication
Facilities Based on Deterioration Mechanisms

Feature Articles
Terrestrial Wireless Systems for Disaster Recovery toProvide Customer Relief
Deployment of Terrestrial Wireless Systems for Disaster Recovery to Provide Customer Relief
Portable Digital Wireless System for Disaster Recovery with Long-range Operation andCompact/Lightweight Configuration
Business Radio System Providing Stable Means of Contact without Dependence on OtherCarriers’ Networks
Wireless Access System for Disaster Recovery Providing Safety and Security to Customers
Cell and Radio Frequency Planning Tool Supporting Wireless Systems for Disaster Recovery

Regular Articles
Color Enhancement by Optimizing the Illumination Spectrum

Global Standardization Activities
Activities toward TM Forum Frameworx 17.0 and TM Forum Live! 2017 ReportView from the Top

Hiromichi Shinohara, Senior Executive Vice President andHead of R&D Strategy Department, NTT▼Overview

Great expectations are being placed on the NTT Group both inside and outside Japanto provide high-quality and stable network services, ensure a safe and secure network
through advanced security measures, and provide a moving user experience and newvalue. The NTT Group itself is committed to solving social issues and providing newways of creating value. How will the NTT Group approach these needs in 2018? We
asked NTT Senior Executive Vice President Hiromichi Shinohara to tell us about hisoutlook and aspirations for the NTT Group.

Front-line Researchers

Hiroshi Sawada, Senior Distinguished Researcher, NTT
Communication Science Laboratories▼Overview

Nonnegative matrix factorization (NMF) enables big data such as Internet of Things
sensor data to be represented in the form of matrices having only nonnegative values
and to be analyzed by using simple mathematical expressions. NMF has foundapplication in many areas including the analysis of audio, image, and text data. Dr.
Hiroshi Sawada is a Senior Distinguished Researcher at NTT Communication Science
Laboratories known for his research and development efforts in NMF and signal
separation technology. We asked him about his current research projects and themind frame needed by a researcher.

Feature Articles
Research and Development of Life-cycle Maintenance of Telecommunication
Infrastructure

Direction of Research and Development of Life-cycle Maintenance▼Abstract

Various social-infrastructure facilities have been constructed in Japan since the period of the country’s rapid
economic growth. These facilities are currently aging, and the cost related to their maintenance,management, and renovation has become a serious issue. It is therefore necessary to improve the efficiencyof the maintenance and management cycle to reduce this enormous cost and extend the service life offacilities. In this article, we use the term life-cycle maintenance to refer to the entire life cycle of themaintenance and management of telecommunication infrastructure, from maintenance planning toinspection, diagnosis, and repair, reinforcement, and renovation. We introduce the direction of research anddevelopment of life-cycle maintenance and present case studies.

Regular Articles

Color Enhancement by Optimizing the Illumination Spectrum▼Abstract
A method is proposed to enhance color saturation while preserving the color appearance of white bycontrolling the spectral power distribution (SPD) of illumination. We used a color chart to design the SPD ofillumination, which enables the enhancement of several colors concurrently. We experimented with a16-color LED (light-emitting diode) lighting system as a light source, which can modulate the intensity ofeach color of light.