November 2016 Vol. 14 No. 11112016

https://www.ntt-review.jp/archive/2016/201611.html

View from the Top

View from the Top

Eiji Ueki, Executive Vice President, NTT DATA▼Overview

Eiji Ueki, NTT DATA Executive Vice President, believes in the importance ofstrengthening global brand power by developing trustworthy relationships with clientsand providing new value with an eye to their future. We asked Mr. Ueki how NTT
DATA plans to face the challenges ahead.

Eiji Ueki, Executive Vice President, NTT DATA

Front-line Researchers

Front-line Researchers

Tomohiro Nakatani, Senior Distinguished Researcher,
NTT Communication Science Laboratories

Tomohiro Nakatani, Senior Distinguished Researcher,
NTT Communication Science Laboratories

Feature Articles
Basic Research Envisioning FutureCommunication
From Information Transmission to Mutual Understanding:Paradigm Shift in the Age of Data
Transmission of High-quality Sound via Networks Using
Speech/Audio Codecs
Learning from a Large Number of Feature Combinations
Towards User-friendly Conversational Systems
Child Language Development: The Differences between
Japanese and English
Elucidating the Brain Processing Mechanisms of Athletes
Using Virtual Reality Technology
How Tracking Technologies Improve Family Communication

Regular Articles
Indium Phosphide-based Heterojunction Bipolar Transistors with Metal Subcollector FabricatedUsing Substrate-transfer Technique

Global Standardization Activities
Standardization Activities in International Electrotechnical Commission Technical Committee 86(Fiber Optics)

Information
Event Report: NTT Communication Science Laboratories Open House 2016

Short Reports
Arkadin’s Unified Communications & Collaboration Portfolio and Service Strategy Position it for
Leadership in the Virtual Workplace▼Overview

Interfaces using speech recognition have become common practice these days.
However, commonly used technologies for this purpose can suffer a drop in recognition
performance in noisy environments or when the microphone is too far from the speaker.
There is therefore a growing need for technologies that can provide more robust andaccurate speech recognition. We asked Dr. Tomohiro Nakatani, Senior Distinguished
Researcher at NTT Communication Science Laboratories, whose technology last year
achieved the world’s highest performance for speech recognition in noisy
environments, to tell us about his recent research results and his approach to research.

Feature Articles
Basic Research Envisioning Future Communication

From Information Transmission to Mutual Understanding:Paradigm Shift in the Age of Data▼AbstractThe paradigm shift from information transmission to communication istaking place amid technological advancements in artificial intelligence(AI) and their attendant expectations. Against this background, I
introduce NTT’s AI-related research and development strategy and theresearch currently being pursued by NTT Communication ScienceLaboratories. I also examine the role played by communication scienceand present a vision of its future.

Regular Articles

Indium Phosphide-based Heterojunction Bipolar Transistors
with Metal Subcollector Fabricated Using Substrate-transferTechnique▼Abstract

We fabricated indium phosphide (InP)-based heterojunction bipolartransistors (HBTs) with a highly thermal conductive gold (Au)
subcollector on a silicon carbide substrate using a substrate-transfertechnique. The fabricated HBTs show good electrical characteristics
without any degradation caused by the transfer process. In addition, they exhibit about a 50% reduction inthermal resistance (Rth) compared with conventional HBTs on an InP substrate. The reduced Rth enables us
to increase collector current density without a rise in the junction temperature of HBTs, which improves theHBT high-frequency performance. The fabricated Au-subcollector HBTs have great potential for boosting
the operation speed of future telecommunications integrated circuits.