Nobutaka KUROKI


A Sub-1-µs Start-Up Time, Fully-Integrated 32-MHz Relaxation Oscillator for Low-Power Intermittent Systems
Hiroki ASANO Tetsuya HIROSE Taro MIYOSHI Keishi TSUBAKI Toshihiro OZAKI Nobutaka KUROKI Masahiro NUMA 
Publication:   
Publication Date: 2018/03/01
Vol. E101-C  No. 3  pp. 161-169
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
relaxation oscillatorfast start-updigital signal processinghigh accuracyintermittent operationPVT variations
 Summary | Full Text:PDF(2.4MB)

Multi-Channel Convolutional Neural Networks for Image Super-Resolution
Shinya OHTANI Yu KATO Nobutaka KUROKI Tetsuya HIROSE Masahiro NUMA 
Publication:   
Publication Date: 2017/02/01
Vol. E100-A  No. 2  pp. 572-580
Type of Manuscript:  Special Section PAPER (Special Section on Image Media Quality)
Category: IMAGE PROCESSING
Keyword: 
super-resolutionresolution enhancementconvolutional neural networksCNNdeep learning
 Summary | Full Text:PDF(3.3MB)

A Highly Efficient Switched-Capacitor Voltage Boost Converter with Nano-Watt MPPT Controller for Low-Voltage Energy Harvesting
Toshihiro OZAKI Tetsuya HIROSE Takahiro NAGAI Keishi TSUBAKI Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2016/12/01
Vol. E99-A  No. 12  pp. 2491-2499
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: 
Keyword: 
energy harvestingDC-DC convertercharge pumpMPPTlow-power
 Summary | Full Text:PDF(3.8MB)

An Energy-Efficient 24T Flip-Flop Consisting of Standard CMOS Gates for Ultra-Low Power Digital VLSIs
Yuzuru SHIZUKU Tetsuya HIROSE Nobutaka KUROKI Masahiro NUMA Mitsuji OKADA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/12/01
Vol. E98-A  No. 12  pp. 2600-2606
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Circuit Design
Keyword: 
D flip-floplow-powerlow-voltageenergy-efficientcompact
 Summary | Full Text:PDF(3.8MB)

A 32-kHz Real-Time Clock Oscillator with On-Chip PVT Variation Compensation Circuit for Ultra-Low Power MCUs
Keishi TSUBAKI Tetsuya HIROSE Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/05/01
Vol. E98-C  No. 5  pp. 446-453
Type of Manuscript:  PAPER
Category: Integrated Electronics
Keyword: 
ROSCRTCoscillatorcomparatorPVT variationlow-power
 Summary | Full Text:PDF(2.2MB)

A Fully On-Chip, 6.66-kHz, 320-nA, 56ppm/°C, CMOS Relaxation Oscillator with PVT Variation Compensation Circuit
Keishi TSUBAKI Tetsuya HIROSE Yuji OSAKI Seiichiro SHIGA Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/06/01
Vol. E97-C  No. 6  pp. 512-518
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
ROSCRTCoscillatorcomparatorPVT variationlow-power
 Summary | Full Text:PDF(2.3MB)

Subthreshold SRAM with Write Assist Technique Using On-Chip Threshold Voltage Monitoring Circuit
Kei MATSUMOTO Tetsuya HIROSE Yuji OSAKI Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/06/01
Vol. E94-C  No. 6  pp. 1042-1048
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
SRAMthreshold voltage variationcompensation circuitprocess variationtemperature variationPVT variation
 Summary | Full Text:PDF(837.7KB)

Robust Subthreshold CMOS Digital Circuit Design with On-Chip Adaptive Supply Voltage Scaling Technique
Yuji OSAKI Tetsuya HIROSE Kei MATSUMOTO Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/01/01
Vol. E94-C  No. 1  pp. 80-88
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
subthreshold operationdigital circuitsPVT variationdelay compensation
 Summary | Full Text:PDF(910.2KB)

An Error Diagnosis Technique Based on Clustering of Elements
Kosuke SHIOKI Narumi OKADA Kosuke WATANABE Tetsuya HIROSE Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/12/01
Vol. E93-A  No. 12  pp. 2490-2496
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Logic Synthesis, Test and Verification
Keyword: 
ECOerror diagnosisincremental synthesisLUT
 Summary | Full Text:PDF(1.4MB)

An Error Diagnosis Technique Based on Location Sets to Rectify Subcircuits
Kosuke SHIOKI Narumi OKADA Toshiro ISHIHARA Tetsuya HIROSE Nobutaka KUROKI Masahiro NUMA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2009/12/01
Vol. E92-A  No. 12  pp. 3136-3142
Type of Manuscript:  Special Section PAPER (Special Section on VLSI Design and CAD Algorithms)
Category: Logic Synthesis, Test and Verfication
Keyword: 
ECOerror diagnosisincremental synthesisLUT
 Summary | Full Text:PDF(926.5KB)

An Evaluation of Triple Density Error Diffusion for Medical Monochrome LCDs
Nobutaka KUROKI Nobuhiro OKA Masahiro NUMA Keisuke YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/06/01
Vol. E89-A  No. 6  pp. 1866-1868
Type of Manuscript:  LETTER
Category: Image
Keyword: 
error diffusionmedical LCDsub-pixel modulationeye-model
 Summary | Full Text:PDF(299.8KB)

Lossless Image Compression by Two-Dimensional Linear Prediction with Variable Coefficients
Nobutaka KUROKI Takanori NOMURA Masahiro TOMITA Kotaro HIRANO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1992/07/25
Vol. E75-A  No. 7  pp. 882-889
Type of Manuscript:  Special Section PAPER (Special Section on Multidimensional Signal Processing)
Category: Image Coding and Compression
Keyword: 
lossless image codingimage compression2D linear prediction
 Summary | Full Text:PDF(735.6KB)