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Nowadays, the population of the elderly people is increasing in Japan. The system to protect an elderly person who is living alone is needful. The bigger part of the accident in their house is falling. There are several kinds of products to detect a person's fall. However, there are some problems that it does not have enough detection range and privacy. Array antenna is an antenna, which detects radio...
Falling is a common health problem for elderly. To address the problem, we are currently developing an acoustic fall detection system, FADE, which automatically detects a fall and reports to the caregiver. Of great importance of the fall detection system is a low false alarm rate that can be achieved by knowing where the acoustic signal comes from. The previous work showed the sound source localization...
We are evaluating the linearity characteristics of digital voltmeters (DVMs) using a programmable Josephson voltage standard (PJVS) system. The PJVS system is composed of a 524 288 junction array and a 10 K compact cooler, which enables to generate an arbitrary output voltage of more than 10 V. The voltage signal output with the PJVS system was applied to DVMs, and the linearity characteristics were...
In this paper, a 10b SAR ADC is designed for low power and low speed application. A two-mode comparator is applied on a generalized non-binary algorithm for better power efficiency. The comparator works in the low accuracy mode during the first few steps, and works in the high accuracy mode for the last few steps. Compared to a conventional SAR ADC, which has a high-accuracy comparator to complete...
The host cardinality refers to the number of different peers that an Internet host communicates with. Stealthy superpoint is a host that its cardinality is between two thresholds during a measurement period. Detecting stealthy superpoints helps intrusion systems identify potential attackers. However, stealthy superpoints may perform scanning deliberately at a low rate, and they can easily evade the...
Pressure ulcers, commonly called bedsores, are defined as injuries to the skin and underlying tissue resulting from prolonged pressure usually on bony areas of the body, such as heels and hips. In order to alleviate pressure accumulation at high-risk regions, the current practice in clinics requires caregivers to reposition their patients every two hours. This relies on the engagement of nursing services...
Shape context is a classic shape retrieval method with translation invariance, but it has not scalar or rotational invariance, which limits its application. A new shape feature descriptor-centroid distance ratio (CdR) is proposed and an improved shape retrieval algorithm based on CdR and shape context is brought forth. First, the contour points are sampled in order to reduce computation and then,...
In this paper, one hybridized method, in which the periodic equivalence principle algorithm is combined with the equivalence principle algorithm, is proposed to solve the finite antenna array with large scale. This method based on the domain decomposition method is more efficient than full-wave methods and more accurate than asymptotical methods with periodic Green's function. Moreover, this approach...
A new technique for computing the location of each antenna element in a conformal array using general Bézier curves is presented here. More specifically, two cubic polynomial Bézier curves are used to compute the location of each antenna element in a conformal 1×4 phased-array antenna on a wedge- and cylindrical-shaped surface for various bend-angles and radius of curvature values, respectively. The...
In recent years, the design of cross-point array based on resistive random access memory (ReRAM) has been widely investigated because it offers extremely high storage density and low power consumption. However, the sneak-path leakage in such a resistive network is inevitable and grows fast as the array size increases, which severely constrains the scalability of cross-point array. This work proposes...
Despite being studied for more than two decades buffer overflow vulnerabilities are still frequently reported in programs. In this paper, we propose a hybrid approach that combines static and dynamic program analysis to audit buffer overflows. Using simple rules, test data are generated to automatically confirm some of the vulnerabilities through dynamic analysis and the remaining cases are predicted...
MouthPad is a tongue-computer interface, which enables the control of a computer pointer through tongue movements, in a joystick like manner. The movement of the tongue is monitored via an electrode array, placed on the palate; the contact impedance between the anterior tongue and the electrodes provides the position of the tongue relative to the electrode array. The performance of the device was...
Fusion of ambient breathing signals can be hampered by the current environmental conditions. Fusion methods that are resistant to most adverse ambient conditions may still be susceptible to some. The diversity of multiple fusion methods can be leveraged by employing a variety of fusion methods to fuse each breathing epoch. By using a trained linear classifier to select the best candidate fusion method...
The Hierarchical Graph Neuron (HGN) has already been known that, it implements a single-cycle memorization and recall operation. The scheme also utilizes small response time that is insensitive to the increases in the number of stored patterns. In this improved approach, the architecture of multidimensional HGN (mHGN) is developed so, that it is not only suitable for scrutinizing 1D- or 2D-patterns;...
This paper presents the design results of the prototype IP block of the successive approximation analog-to-digital converter (SAR ADC) for implementation by 0.18 um MMRF CMOS technology of UMC (Taiwan). Primarily the ADC unit was designed according to the technical requirements for the readout electronics of the silicon tracking system of the Compressed Baryonic Matter experiment at accelerator facility...
Direction of arrival (DOA) is an important parameter to be measured in pulse compression radar (PCR) systems. It is more favorable for DOA estimation to be done after pulse compression, because the targets have been separated in range domain and usually have higher SNR. But after pulse compression, only a single snapshot is available in each range cell. As a result, conventional DOA estimation methods...
This paper addresses the calibration of segmented current-steering Digital-to-Analog Converters (DACs). In many design cases, current-steering DACs are divided into a thermometer-coded unary section and a binary section. This is done mostly for dynamic reasons. However, the decisions on the segmentation also impact an eventual static calibration. In this paper, we show that the introduction of an...
A concept for a Multi-Function Phased Array Radar (MPAR) to provide next generation simultaneous aircraft and weather surveillance has been developed. This paper discusses a number of system design considerations that are needed to address the multi-mission challenges of MPAR, especially with respect to its stringent timeline objectives.
The Multiple Signal Classification (MUSIC) algorithm is widely used to estimate the direction of arrival (DOA) of signals impinging on a sensor array. In this work, we analyze the performance of the MUSIC algorithm in the presence of white noise, and when only a random, sample independent subset of the entries in the data matrix are observed, in both the sample rich and deficient regimes. We derive...
Contrary to claims made Multiple Input and Multiple Output (MIMO) radars do not provide an order of magnitude or better angle resolution, accuracy and identifiability (the ability to resolve and identify targets) over conventional radars. This claim is based on using a MIMO array radar system consisting of a full transmit array and thinned receive array (or vice versa; called here a full/thin array)...
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