The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
An all-digital positron emission tomography (PET) scanner for imaging small animals has been developed at Huazhong University of Science and Technology (HUST). The implementation of block detector with position sensitive photomultiplier (PSPMT) and multi-voltage threshold (MVT) technology is presented in this paper. The detector comprises 12 basic detector modules (BDMs), which can be used to construct...
Cooperation can improve the performance of spectrum sensing in the cognitive radio networks by taking advantage of diversity gains. It has been shown that sequential probability ratio test (SPRT) is a promising data fusion technique for cooperative spectrum sensing. However, most exiting works assume that the primary spectrum status stays unchanged during the cooperative sensing process. We argue...
This paper presents a feature recognition method based on randomized trees. We aim to improve the performance of Lepetit's work, whose actual results are very sensitive to large changes of viewpoint due to its limited ability of samples synthesizing and learning. We propose an approach to alleviate its limitation, which simulates the image appearance changes under actual viewpoint changes by applying...
A 1.0 V to 1.8 V mixed-voltage I/O buffer implemented with 90-nm 1-V standard CMOS devices is proposed. By using a dynamic gate bias generator to provide appropriate gate drive voltages for the output stage, the I/O buffer can transmit 2×VDD voltage level signal without any gate-oxide overstress hazard. Besides, the leakage current is eliminated by adopting a floating N-well circuit. The maximum data...
The evaporated substance of Scandia doped impregnated dispenser cathode is mainly composed of Ba and BaO and Ba evaporated more easily than BaO from the surface of the scandate cathode, which is consistent with the result of impregnated Ba-W cathode. However, the evaporation rate of total substance and the evaporated amount of Ba and BaO from the scandate dispenser cathode are lower than those from...
Recently, lattice-reduction (LR) has been proposed to improve the performance of linear and successive interference cancellation (SIC) detectors and precoders in MIMO systems. It is proved that LR-aided linear detectors collect the same diversity order as that exploited by the ML detector but with much lower complexity when perfect channel state information (CSI) is assumed to be available. However,...
The accuracy of corner detection is critical for many machine vision applications. A novel corner detector based on video is proposed in this paper. The corner detector can effectively constrain camera noise by using multiple frames from video. The kernel of this method is the similarity algorithm which including a special representation of binary image, a robust template, a simple similarity function...
This paper presents an evaluation of the SIFT (scale invariant feature transform), Colour SIFT, and SURF (speeded up robust feature) descriptors on very low resolution images. The performance of the three descriptors are compared against each other on the precision and recall measures using ground truth correct matching data. Our experimental results show that both SIFT and colour SIFT are more robust...
In this paper, a sequential change detection scheme is proposed to detect the emergence of a primary signal with unknown power. It can be shown that the proposed test can do better than the generalized likelihood ratio (GLR) test, under the same worst case average run length (ARL) of detection delay constraint. And performance of our test is evaluated using theoretical analysis and numerical simulations.
A 0.9 V to 5 V (0.9/1.2/1.8/2.5/3.5/5 V) mixed-voltage I/O buffer with NMOS clamping technique is proposed. By using a dynamic gate bias generator to provide appropriate gate drive voltages for the output stage, the I/O buffer can transmit 3 times VDD voltage level signal without gate-oxide overstress hazard. Besides, the leakage current effect is eliminated by adopting a floating N-well circuit....
Spectrum sensing is important for cognitive radios to utilize the idle spectrum opportunities, and recently cooperation schemes have been introduced to enhance spectrum sensing in specific areas. However, when a mobile cognitive node roams among heterogenous wireless network, it will be difficult to catch the changes of primary user's behavior, or to setup the cooperation relationship with local network...
Salient region of the image, which is composed of salient or interest points, is the most informative part of the image. In this paper, a saliency-based bottom-up visual attention computational model motivated by visual physiological experimental results is used to detect salient region and extract salient points of images. Meanwhile, a method to select number of the salient points to be extracted...
This paper presents an implemented system for testing IEEE 1451 standard by using PC computer and an implemented board with various sensors. Communication is according to IEEE 1451 standard through RS232
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.