記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

In recent years, we have been using biometric verification systems in various places such as daily life and businesses. However, it’s insufficient in hospital and food factory to introduction of the security system of the room access control. This is because they wear gloves, masks and hats in hospitals and factories, so they cannot verify faces or fingerprints. In this study, we propose a speaker verification system using HTM (Hierarchical Temporal Memory). We verify speaker and detection of unlearned speakers by experiments. In addition, we consider the use in hospitals and factories, and also evaluate it in a noisy environment. The evaluation values are Precision, Recall, and F-measure. The experimental results show that in the case of 10 learners, F-measure exceeded 0.6 in the classification of 2 classes of learners and non-learners.

DOI： 10.1007/978-3-030-55307-4_25

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Back pain is widespread in Japan in recent years. The economic loss from back pain in Japan was 82.1 billion yen in 2011. Therefore, it is necessary to construct a low back pain prevention system that can be easily used. First, system estimate the body part from the image using OPENPOSE. It extract the five coordinates (neck, shoulders, and buttocks) from the output. It calculate the z coordinate of each point. Finally, It estimate the front-back tilt and the left-right tilt. We compare three distances (2 m, 3.5 m, 5 m) and three angles (20°, 0°, −20°) in experiments. Review the results. In the distance, the discrimination rates are 2 m: 83%, 3.5 m: 99%, 5 m: 66%. Next, regarding the angle, the discrimination system was good in the order of 20°, 0°, 20°.

DOI： 10.1007/978-3-030-55307-4_53

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

The questionnaire method is generally used for present dementia screening. However, this method requires time for 10 to 15 min with a doctor and a clinical psychologist, which puts a burden on hospitals and test subjects. The purpose of this study is to reduce the burden of users by constructing a system to distinguish patients with mild dementia and healthy persons from speech data. Before that this paper examines the effectiveness of speech features. MFCC has been confirmed to be effective in previous research, this paper extracted six kinds of other speech features that are likely to be correlated with symptoms of dementia. This paper got about 90% accuracy rate for a sentence of conversational speech in SVM and Random Forest. Moreover, this paper has calculated the importance of the features by using the SVM-RFE method. As a result, this showed that log-mel spectrum was more important than MFCC.

DOI： 10.1007/978-3-030-55307-4_54

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kobe   2020年10月13日  -  2020年10月16日

© 2020 IEEE. There are a lot of social problems related to alcohol. To solve them, we are developing a non-invasive, wearable device that measures the blood alcohol concentration using nearinfrared lights of the two specific wavelengths, one responds to alcohol remarkably, and the other does less. The purpose of this work is to determine such two particular wavelengths. By measuring a near-infrared spectrum of the binary mixture solution of ethanol and water, and taking LED (Light Emitting Diode) and PD (Photo Diode) characteristics into account, 890 nm for the sample and 870 nm for the reference are the suitable wavelength combinations to measure alcohol.

DOI： 10.1109/GCCE50665.2020.9291911

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. Voice is very important in our daily life. However, some people cannot speak because of throat surgery. Electrolarynx (EL) is a way for them to speak again but this voice is flat and noisy like a buzzer. Therefore, we propose a new Electrolarynx system based on WaveRNN. When we use it, the EL voice is converted into a voice close to the natural voice. We assume that this system will be provided as a smartphone application. In the experiment, we evaluated the converted voice by the system and found that naturalness improved.

DOI： 10.1109/ICCE46568.2020.9043135

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. How to input characters without mistakes is one of very important points for the interface, when we consider usability of electronic devices such as personal computers and smartphones. Therefore, in this paper, we examine whether we can classify mistypes for Japanese input and inform the users how they make mistakes using 'Attention' and 'LSTM' of machine learning methods. First, we classified the category of mistypes in Japanese input into seven types (Replacement, Removal, Exchange, Insertion, Involvement, Repetition). Second, we asked subjects to input the displayed words and collected their data. Next, we classified the data and labeled it. Finally, we made the Neural Network (LSTM + Attention) to classify the mistype data and inform how they make mistakes. As a result, the correct answer rate of the Neural Network (LSTM + Attention) was about 70% and we were able to know where point the Neural Network focus on by putting in 'Attention'. We are planning to use 'LSTM' to correct mistype directly and use 'Attention' to inform how they frequently make mistakes in the future.

DOI： 10.1109/ICCE46568.2020.9043138

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery. In this paper, the horizontal sound image experiment of the real sound source was performed under the head resting condition using the band - limited noise using the low pass filter and the band pass filter. Then, the effect of each frequency band on direction perception of the hearing person and the elderly person was clarified. Five people with healthy men in their twenties and five elderly people in their 70s male hearing white noise pass through low-pass filters (2, 3, 4, 5, 6 kHz) and band-pass filters (1-4, 2-4, 2-5 [kHz]) passed through the directional perception experiment. As a result, similarly to the previous study [1], it is difficult to perceive directions sufficiently if two or more frequency bands are included, and it is difficult to perceive the direction of band-pass noise through a band-pass filter of a narrow frequency band. As a result of this research, Direction perception was found that the frequency band around 4 [kHz] and 6 [kHz] is small as an element of direction perception and the frequency band around 5 [kHz] is an important clue for direction perception.

DOI： 10.1145/3325291.3325395

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery. In recent years, malicious visit sales are increasing in Japan, targeting elderly people living alone and dementia patients. Since it is difficult for them to deal with problems with their own power, it is necessary for surrounding people to support damage deterrence. So, we aim to realize a watching system that anyone can use if there is only a smart speaker. In this study, we propose a method to detect door-to-door sales from conversation information of elderly people and visitors with the aim of realizing a system to prevent elderly consumers' troubles. In the evaluation experiment, we evaluate how accurately door-to-door sales can be detected out of the conversation dataset. In addition, we try to determine the risk degree by learning the door-to-door sales sample data given the risk label.

DOI： 10.1145/3325291.3325391

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery. In Japan, accidents are occurring when visually impaired people go out. For example, a collision with an obstacle such as a person or a wall, or a fall from the station platform. A current measure for this problem is a voice guidance. However, visually impaired people place importance on auditory information. Therefore, it is difficult for them to hear surrounding sounds during listening the voice guidance. There is a previous research that trying to guide the visually impaired people to their destination by vibration transmission. However, although this study have realized the guidance of the visually impaired people to their destination without interrupting environmental sounds, this method cannot correct the veering in real time. For above reason, we propose a veering correction system by vibration transmission, which does not disturb acquisition of auditory information. This is a system that gives them vibration by wearing a vibration motor on their shoulders and corrects the veering. In this article, we conducted verification experiment of the effectiveness of the veering correction by vibration transmission as a preliminary study in the development of the veering correction system. As a result of the research, we were able to keep the deviations from over 100 cm to less than 100 cm. As a conclusion, vibration transmission is effective as a method of correcting the veering of visually impaired people.

DOI： 10.1145/3325291.3325392

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery. In recent years, the damage caused by the earthquake has become very large in Japan. Secondary disasters such as tsunami and fire are the main causes of death due to the earthquake, both of which are causes of evacuation delay. Rapid evacuation is important in the event of a disaster. However, due to the earthquake, various obstacles will occur in the aisle. Obstacles may occur due to the collapse of houses due to the earthquake and it may take time to pass. If you can obtain information about the aisle in advance and avoid evacuation routes in advance, you can complete evacuation safer and more quickly. As a method of acquiring traffic information, We thought that the use of SNS is useful from the viewpoint of the real-time nature of information and the penetration rate of young people aggressively actively communicating information. In this research, we proposed an evacuation guidance system to evacuate users with a safe shortest route. Then we examined the danger of passing through obstacles. As a result, "road shredder" is evaluated as the most dangerous, and "road crack" is evaluated as the most secure.

DOI： 10.1145/3325291.3325390

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery. ACM In recent years, the demand for the logistics industry has increased enormously due to the spread of Internet mail order. On the other hand, the number of fatal accidents caused by trucks is more than 10,000 a year in Japan. Above all, there is a problem that there is an annual fatal and fatal accident due to truck load collapse. In this study, using the drive recorder, we calculated the inclination of the package photographed during driving by using KCF of object tracking method of image processing. Comparing the change of the Luggage tilt and the amount of change in 3-axis acceleration attached to the vehicle/ time of each frame in all the data, frames at each maximum value point almost agreed at the time of” When riding over convex part of inclined road”. On the other hand, “When a sudden steering wheel during driving”, a point where the absolute value of the change in package inclination during one frame reaches 0.005 ° and the point where the maximum change occurs after that. It almost coincided with the point where the curve was reached in the video. As for the 3-axis acceleration sensor, there is no difference in tendency between the curve and the straight running, and it is considered as the main cause that the influence of the roughness of the road is greatly influenced rather than the influence at the time of the curve.

DOI： 10.1145/3325291.3325393

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery. In the train while driving, there are many noises such as noises from the vibration of the vehicle and the shock noise generated at the vehicle connection, and the roar of human beings, etc. In addition to stressing the passengers, these noises it prevents you from listening to the announcements in the train. In this paper, a new noise canceling earphone system aimed at improving in-car announcement speech listening and reducing stress that the noise gives to passengers by separating surrounding speech and in-train announcement speech regarded as noise I devised. In this study, as a preliminary step to complete the system, in order to find the difference between the ambient speech and the announcement speech such as the roar of the passenger, both speeches were compared using acoustic features. As a result, among the acoustic features used in the comparison, differences were found in the spectral centroid, the spectral roll-off, and the intensity and spectral contrast when divided into sub-bands.

DOI： 10.1145/3325291.3325394

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery.ACM In Japan, there are about 30,000 people whose larynxes have been removed. These people are not able to make voice, so they have problems in communication. For example, they cannot communicate their will enough with communication by writing or gestures alone, thereby avoiding communication. However, they can move the mouth and tongue normally. Therefore, they speak using alternative vocalizations. Electrical artificial larynx (EL) is one of the alternative vocalizations. When the vibrator is pressed against the lower part of the jaw, the vibration sound is transmitted in the sound path. This speech method is easy to learn and is cleaner than other speech methods, but this voice sound is bad quality because it has no intonation and it is noisy. In this study, we tried to improve the EL sound quality by using WaveRNN that is one of Deep learning. After making WaveRNN learn human voice, we converted the EL voice. We evaluated the converted voice in a subjective evaluation experiment in 10 words that selected each consonant and vowels in a balanced manner. The evaluation items are: 1. Clarity of consonants, 2. Clarity of vowels, 3. Clarity of whole voice, 4. Natural, 5. Easy to hear. As a result, Clarity and naturalness of consonants improved in words containing two or more unvoiced consonants. On the other hand, in the voiced consonants and vowels, no improvement was seen by the proposed method. Therefore, we think that voice quality was improved in unvoiced consonants. On the other hand, there was no tendency for improvement in voiced consonants and vowels.

DOI： 10.1145/3325291.3325396

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記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.3390/s130101076

Kyutacar

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記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

This paper reports miniaturization on one-chip size of a receptor part of taste sensor, which can measure the taste using lipid/polymer membranes. The miniaturization was made by producing metal electrodes and making lipid/polymer membranes deposit on a glass substrate. The reference electrode also realized a miniaturization and stabilization of potential according to laminating structures of pHEMA and polymer layers. Therefore, an integration of the working and the reference electrodes was attained on the chip. By realization of this taste sensor chip, taste measurement can be easily performed now in all places, such as the distribution industry and the medicine manufacture industry, including the food industry. Moreover, we succeeded to fabricate the portable taste sensor system which unified the amplifier, a data-processing unit and an LCD display. © 2006 IEEE.

DOI： 10.1109/MMB.2006.251522

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

We study CMOS system LSI for radio communication implemented with low energy consumption (low power) and low cost as key device for mobile and ubiquitous computing. We designed the trial mixed-signal CMOS chip for 2.4GHz wireless LAN (IEEE 802.11b) in TSMC's 0.25um CMOS technology. As distinctive feature, coplanar waveguide (CPW) is used to realize the matching circuits placed between radio frequency (RF) amplifiers, at less cost than former inductor and capacitance (LC) circuit on chip. The trial chip operates the main functions of the 802.11b standard physical layer (PHY); carrier modulation by direct conversion, gain control, direct sequence spreading spectrum (DSSS), differential phase shift keying (DPSK) modulation, complementary code keying (CCK) modulation, framing the physical layer convergence procedure (PLCP) protocol data units (PPDUs), and, those reverse operations. This paper reports the structure of the trial chip containing RF circuits, base band analog circuits, and digital circuits on the very single chip. ©2004 IEEE.

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Phase Frequency Detectors (PFDs) for use in clock distribution PLLs and Phase Detectors (PDs) for clock recovery PLLs that we have proposed recently to achieve high performance are reviewed and discussed. For the PFD, operating speed limitation and phase detecting characteristics are improved with two kinds of approaches, i.e., gate/logic design and configuration design. For the PD, a simple compensation technique to prevent the deterioration of the phase detecting characteristics by D-F/F and a new PD with delay cell of VCO replica are proposed to reduce the jitter caused by PD. By SPICE simulations and experiments, it is confirmed that the maximum operating speed of PFD is improved to more than twice of conventional one and the jitter caused by PD is reduced to a minimum level.

DOI： 10.1023/A:1014428400796

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（大学，研究機関等紀要）

In this paper, a new fast lock-in PLL with FDD (Frequency Difference Detector) is described. The PLL which is charge-pump type PLL is composed of PFD, CP, VCO and LPF, and it features the adaptive loop gain realized by altering the current in CP or capacitance of LPF according to the frequency difference between input and VCO signal. The proposed PLL is designed in 0.6 μm CMOS and SPICE simulations show that its lock-in time is one-fourth faster than that of the conventional PLL at 5 V and 400 MHz.

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

A variable loop gain PLL for fast lock-in is proposed, it changes dynamically the loop gain by altering the charge pump current or the capacitance of LPF according to the frequency difference between input and VCO signals. PLL consists of charge-pump PLL core and loop gain control block which contains FDD (Frequency Difference Detector) and variable-capacitance circuits. The proposed PLL is designed in 0.5μm CMOS and computer simulation shows that its lock-in time is twice faster than that of the conventional PLL.

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記述言語：英語   掲載種別：研究論文（学術雑誌）

A design of clock generation PLL which improves the jitter performance and reduces the chip area is described. To reduce the VCO jitter. DC voltage regulator for stabilizing the supply voltage of PLL and a design method of optimum PFD characteristics are proposed. Utilizing the proposed design method, the jitter of the PLL is reduced to 40 psec at 320 MHz operating frequency under the noisy supply voltage condition. For the reduction of chip area, a filter circuit with variable capacitance are realized by a buffer and a small fixed capacitance. A new VCO bias circuit is also proposed to realize the linear VCO characteristics. The effective performance of the proposed filter and bias circuit is confirmed by SPICE simulation.

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（大学，研究機関等紀要）

Based on device structure, HEMT DC characteristics are estimated by device simulation Results show quantative agreement with measured results. To confirm that the device simaltion results can be applied to circuit simulation model, a nonlinear HEMT model recently proposed by Hirose and Watanabe, which employs an improved tanh function nonlinear fitting model has been investigated to prove its usefulness for our design system. The results are fitted by the nonlinear model better than SPICE MESFET model used in our previous work. These results show that HEMT DC characteristics can be estimated from the device simulation without fabrication to some extent.

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

An implementation technique of dynamic CMOS circuit is described. Based on the concept to represent the logic equation making use of the dynamic charge, most of asynchronous/synchronous logic can be implemented in dynamic CMOS circuit. In this paper, D-latch, D-Flip/Flop, JK-Flip/Flop and Phase Frequency Detector are shown that they can be implemented with the concept and technique and it is confirmed by SPICE simulation that they have a comparable or much better performance compared with the circuits designed with the transmission gate.

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

This paper describes a new PFD (Phase Frequency Detector) with feedforward reset structure, which is effective to realize a high performance PLL at low supply voltage. The feedforward reset signal generated with the shot pulse independently of D-F/F reduces the reset delay and reset pulse width otherwise enlarged by the propagation delay of D-F/F and also gives the independence of timing setting between D-F/F input and reset. Timing adjustment of D-F/F input utilizing the independence reduces the reset delay relatively and is able to improve the phase detecting characteristics such as dead zone. The proposed PFD constructed with dynamic CMOS gates achieves more than twice higher maximum operating frequency compared with the conventional PFD. The circuits have been designed with a 0.8 μm CMOS and evaluated by SPICE simulation.

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記述言語：英語   掲載種別：研究論文（大学，研究機関等紀要）

To reduce power dissipation of LSI drastically, it is very effective to lower supply voltage, for example from 5V to 3V or 3V to 1.5V, because power dissipation is proportional to the square of supply voltage. However, reduction of supply voltage results in the increase of propagation delay of the constituent gates. In case of PFD (Phase Frequency Detector) which is one of the components of PLL (Phase Locked Loop), increase of the propagation delay deteriorates its phase detecting characteristics and therefore pull-in characteristics of the PLL. One of the solutions to this problem is the construction of PFD with dynamic CMOS gates as we proposed in our earlier paper. In this paper, we propose a systematic and straightforward method to construct PFD with dynamic CMOS gates and clarify the effect of the dynamic structure on PFD and PLL performance.

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（大学，研究機関等紀要）

This paper describes low-power and high-speed RTD/HEMT (Resonant Tunneling Diode / High-Electron Mobility Transistor) logic circuits. In order to estimate RTD/HEMT logic gates using ordinary GaAs/AlGaAs HEMT in detail by using real device parameters extracted from measured values, we have examined their characteristics. Fundamental characteristics of logic gates are examined and compared with resistor-load and depletion-mode HEMT (D-HEMT) load inverters. The results show that RTD/HEMT inverter is the fastest among them. Their application to functional circuits such as phase comparator (PC) and voltage controlled oscillator (VCO) used in PLL are also described.

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記述言語：英語   掲載種別：研究論文（学術雑誌）

To realize the high speed and low power CMOS Phase Locked Loop, we have developed new components of PLL: VCO and PFD. In the VCO, high speed and low power is realized with source coupled inverter pairs in the single loop three gate ring oscillator. And in the PFD, low power and small chip area are realized with the dynamic inverter. And with the simple design adjustment , both reduction of dead zone and immunity of current fluctuation at "0" output are implemented in Charge Pump. A fully CMOS PLL with these components have been designed with 0.8 μ CMOS. At 622 MHz operation, the power dissipation of 18 mW is achieved by SPICE simulation.

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（大学，研究機関等紀要）

This paper describes a CMOS 1st-order delay-line DPLL in 1.2μm technology for clock regeneration. We have employed a parallel-architecture PC (Phase Comparator) to improve the speed and a DCO (Digitally Controlled Oscillator) without timing hazard. And we have also laid it out in 1.2/μm CMOS, and simulated its performance by SPICE as well as logic simulation. Results show that the DPLL operates up to 60MHz, and that lock-in ranges are +5/-5% for regular "10" input and +5/-5% for 213 - 1 PRBS (Pseudo-Random Bit Sequence) input, respectively.

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記述言語：英語   掲載種別：研究論文（学術雑誌）

With the development of high‐speed digital communications, e.g., optical fiber communications, smaller, faster, retiming devices are being required. The phase‐locked loops (PLLs) are suited to an integration compared to surface acoustic wave (SAW) or liquid crystal (LC) passive filters. Therefore, PLLs have been put to use gradually as clock extraction devices in any frequency range over 100 MHz. The authors have developed the previously reported PLL with frequency difference detector (FDD) to provide a new function, which is useful to overcome the pseudo‐lock problem in conventional retiming PLLs and also improved performance of the FDD. The proposed PLL has been constructed with ECL‐IC, PLA and other discrete parts. It has been evaluated experimentally and the PLL designed with a 0.8‐μ design‐rule bipolar transistor has been evaluated by simulation to confirm the following characteristics. 1. The PLL can detect an initial unlock state and pseudo‐lock state within almost the same time as FDD sampling time and can recover rapidly. 2. The jitter transfer function is almost equal to the usual first‐order PLL and is independent of input data patterns. 3. The FDD frequency detecting range, corresponding to the PLL lock‐in range, is more than four times that of the previously proposed FDD‐PLL. Copyright © 1995 Wiley Periodicals, Inc., A Wiley Company

DOI： 10.1002/ecjb.4420781213

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

PLLs are expected to be desirable components for clock extraction in high speed digital communication systems, typically in optical systems, because of the low cost, compactness, suitability for integration, and ease of treatment. In this paper, the authors will describe a total PLL system, in which a further improvement of the pull-in-time is realized and a pseudo lock (i.e. harmonic lock), which has been a serious problem in the past, can be avoided automatically.

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記述言語：英語   掲載種別：研究論文（学術雑誌）

A detailed and practical chip organization of Bloch line memory is proposed on the basis of preliminary experiments and computer simulations, The major line - minor loop organization is composed of two levels zigzag conductors to propagate bubbles (major line) and stripe domain walls surrounding grooved region where the epitaxial garnet layer is completely etched (minor loops), The garnet film thickness is chosen as one half of the usual bubble memory chip, which reduces the magneto-static attractive force between bubbles and between Bloch line pairs, and is preferable for Bloch line potential well generation to define bit position. New practical methods for VBL read-write operation are established by simulations and experiments. © 1986 IEEE

DOI： 10.1109/TMAG.1986.1064520

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開催期間： 2020年01月04日 - 2020年01月06日   記述言語：英語   開催地：Las Vegas, U.S.A.  

開催期間： 2019年09月27日   記述言語：日本語   開催地：北九州市  

開催期間： 2019年09月27日   記述言語：日本語   開催地：北九州市  

開催期間： 2019年09月27日   記述言語：日本語   開催地：北九州市  

開催期間： 2019年09月27日   記述言語：日本語   開催地：北九州市  

開催期間： 2019年09月27日   記述言語：日本語   開催地：北九州市  

開催期間： 2019年09月27日   記述言語：日本語   開催地：北九州市  

開催期間： 2019年08月22日 - 2019年08月24日   記述言語：英語   開催地：Nice, France  

開催期間： 2018年09月27日 - 2018年09月28日   記述言語：日本語   開催地：大分市  

開催期間： 2017年09月27日 - 2017年09月28日   記述言語：日本語   開催地：那覇市  

開催期間： 2017年09月27日 - 2017年09月28日   記述言語：日本語   開催地：那覇市  

開催期間： 2017年09月27日 - 2017年09月28日   記述言語：日本語   開催地：那覇市  

開催期間： 2016年09月29日 - 2016年09月30日   記述言語：日本語   開催地：宮崎市  

開催期間： 2016年09月29日 - 2016年09月30日   記述言語：日本語   開催地：宮崎市  

開催期間： 2016年05月12日 - 2016年05月13日   記述言語：日本語   開催地：北九州市  

インバータは、反転電圧を参照電圧とするインバータ回路と考えられるが、反転電圧はばらつき、反転電圧（参照電圧）を正確に規定することができない。反転電圧のばらつきが確率的と仮定すると、多数のインバータを並列化する冗長構成を採ることで、ばらつきがあっても統計的な処理によって反転電圧を規定することができる。本研究では、65nm CMOSプロセス、0.4V動作の冗長構成のインバータ型コンパレータを検討した。回路はVerirog HDL設計、論理合成およびP&Rの全合成であり、モンテカルロシミュレーションによりトランジスタレベルで特性を評価した。冗長度63のとき、反転電圧のばらつきσは0.5mVであった。

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開催期間： 2007年09月18日   記述言語：日本語   開催地： 那覇市  

開催期間： 2007年09月18日   記述言語：日本語   開催地： 那覇市  

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開催期間： 2006年11月28日   記述言語：日本語   開催地： 北九州市  

開催期間： 2006年09月29日   記述言語：日本語   開催地： 宮崎市  

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開催期間： 2004年05月   記述言語：日本語