November 2018 Vol. 16 No. 11112018https://www.ntt-review.jp/archive/2018/201811.html

View from the Top
Kazuhiro Yoshizawa, President and Chief ExecutiveOfficer, NTT DOCOMO

Front-line Researchers
Ryuichiro Higashinaka, Senior Distinguished Researcher,
NTT Media Intelligence Laboratories

View from the Top

Kazuhiro Yoshizawa, President and Chief Executive Officer, NTT DOCOMO▼Overview
With its sights firmly on the 5G (fifth-generation mobile communications networks) era,
NTT DOCOMO has achieved a gigabit-capable mobile network by increasing its
effective download speed by 1.5 times over the previous year. Breaking away from its
traditional image of a mobile and smartphone company, NTT DOCOMO has strived toimprove its long-term corporate value and to create a safe and secure, comfortable,
and richer society. We asked Kazuhiro Yoshizawa, President and Chief Executive
Officer of NTT DOCOMO, about his outlook and aspirations based on theMedium-Term Strategy 2020 known as “Declaration beyond.”

Front-line Researchers

Ryuichiro Higashinaka, Senior Distinguished Researcher,
NTT Media Intelligence Laboratories

Feature Articles
Further Exploring CommunicationScience▼Overview

Shift to New Dimensions—Further Initiatives to Deepen
Communication Science
SpeakerBeam: A New Deep Learning Technology for
Extracting Speech of a Target Speaker Based on theSpeaker’s Voice Characteristics
Network Reliability Optimization by Using Binary
Decision Diagrams
Ukuzo—A Projection Mapping Technique to Give Illusory
Depth Impressions to Two-dimensional Real Objects
Cross-media Scene Analysis: Estimating Objects’ Visuals
Only from Audio
Measuring, Understanding, and Cultivating Wellbeing in
the Age of Technology

Feature Articles
Further Exploring Communication Science

Regular Articles
High-speed Avalanche Photodiodes toward 100-Gbit/s per Lambda Era

Global Standardization Activities
Telecom Infra Project—Its Structure and Activities

Information
Event Report: NTT Communication Science Laboratories Open House 2018

Short Reports
Ultrahigh-speed Integrated Circuit Capable of Wireless Transmission of 100 Gbit/s in the300-GHz BandThe spread of smartphones and artificial intelligence (AI) systems that speak meansthat the opportunities for general users to come into contact with AI are increasing.
Under these circumstances, NTT has continuously gained attention in announcing
pioneering technologies in the fields of question answering functions and language
processing. We visited Ryuichiro Higashinaka, Senior Distinguished Researcher at
NTT Media Intelligence Laboratories, and asked him about the progress and outlook of
his research, his attitude as a researcher, and how the development of AI and a futurein which robots and humans can talk smoothly will bring about changes in our society.

Shift to New Dimensions—Further Initiatives to Deepen
Communication Science▼Abstract

NTT Communication Science Laboratories aims to realize communication that reaches the heart, fromperson to person, and between people and computers. We are building fundamental theories in pursuit of
the essence of people and of information, and working to create core technologies that will transformsociety. This article introduces some of our initiatives to push deeper in communication science, in areas
including speech and audio processing, dialogue processing, human information science, sports brain
science, and machine learning and optimization.

Regular Articles

High-speed Avalanche Photodiodes toward 100-Gbit/s per Lambda Era▼Abstract
We have developed an avalanche photodiode (APD) in an effort to achieve 100-Gbit/s operation with asingle wavelength (100-Gbit/s/lambda). The APD features a gap-grading layer and was set between theabsorber and avalanche layers. It achieved an operating bandwidth of 42 GHz in low-gain conditions. An
optical receiver made with the APD demonstrated 106-Gbit/s 4-level pulse amplitude modulation operationand 40-km optical amplifier-free transmission over a single-mode fiber under assumption of a KP4 forward
error correction threshold.