This paper addresses the thresholding of biological images through multiobjective optimization techniques. Three objective functions are used during the optimization, which are combined at pairs: Shannon entropy versu...
详细信息
This paper addresses the thresholding of biological images through multiobjective optimization techniques. Three objective functions are used during the optimization, which are combined at pairs: Shannon entropy versus Otsu's inter-class and Shannon entropy versus Otsu's intra-class. We show that although both combinations are obtaining the same vector of thresholds, the first objective function pair presents less computational effort to compute the Pareto front. Furthermore, we have also show that the size of the initial population of the evolutionary algorithm can be selected as 1/10 of the full space. As a consequence, Pareto fronts can quickly be computed and without affecting its performance and diversity.
The Cave airflow system is widely used for long train caves to ensure adequate air airflow models. In the context of Indian Railways, ventilation serves multiple purposes such as air quality monitoring, fire preventio...
详细信息
ISBN:
(数字)9798350353778
ISBN:
(纸本)9798350353785
The Cave airflow system is widely used for long train caves to ensure adequate air airflow models. In the context of Indian Railways, ventilation serves multiple purposes such as air quality monitoring, fire prevention, and temperature regulation in case a diesel loco enters the tunnel. To ventilate a train cave effectively, motors are utilized as blowers or exhaust fans based on the specific requirements. The system has a gas sensor to activate blowers in case of smoke or dust detection after the train exits the tunnel. Additionally, a Flame sensor triggers one motor to operate as a blower at the entrance and the other as an exhaust which operates at a higher rpm than normal condition as mentioned above at the exit upon detecting fire inside the tunnel. A controller must collect and relay information to the control room to manage the entire operation. The programming for the drive mechanism is written in C using the Arduino IDE software, and it is operated by an Arduino combined with an acceleration circuit. Through the use of the Modbus interface and RS232 sequential connection, the complete system communicates information through the SCADA system. Effective collaboration among the linked devices has been demonstrated by the successful testing of this suggested configuration. The research results made it easier to automate these gadgets, allowing them to identify and keep track of the train cave's general condition. Online and offline modes have been made for optimized airflow and safeguard.
Direct time-of-flight (DToF) has become a prominent depth-sensing technique used in light detection and ranging (LiDAR) systems for consumer, industrial, and automotive applications. Compared with scanning LiDAR, flas...
详细信息
ISBN:
(纸本)9781665443500
Direct time-of-flight (DToF) has become a prominent depth-sensing technique used in light detection and ranging (LiDAR) systems for consumer, industrial, and automotive applications. Compared with scanning LiDAR, flash LiDAR eliminates mechanical moving parts and MEMS mirrors, making compact solid-state LiDAR systems available with high reliability and low cost [1]. Fig. 1(a) illustrates a solid-state flash DToF system consisting of a single photon avalanche diode (SPAD)-based receiver sensor, a high-power pulsed laser-diode driver (LDD), and a vertical cavity surface-emitting laser (VCSEL) array as the laser source. To detect longer range within power consumption constraints, short laser pulses with high peak power are required. Several integrated pulsed LDDs have been reported in recent years, but they either have over 50V supply voltage and un-programmable pulse width [2] [3], or 500mA low modulation current [4]. This work presents an integrated VCSEL array driver generating over 8A maximum peak current using a 12V supply, producing laser pulses up to 20.3W peak power, 120ps rise time, and down to 276ps full-width at half-maximum (FWHM).
For a table-top Compton camera, which is currently under development in our group, the interaction position resolution of the absorber detector is a critical or limiting detector parameter that most seriously affects ...
详细信息
ISBN:
(纸本)9781424409228
For a table-top Compton camera, which is currently under development in our group, the interaction position resolution of the absorber detector is a critical or limiting detector parameter that most seriously affects the imaging resolution of the Compton camera. Currently, it is assumed that all the interactions occur at the centers of the detector segments of the absorber detector, which is simple, but obviously not the best choice considering that the interaction depths of the photons in the absorber detector is not distributed uniformly, especially for the low-energy photons. To this end, the present study develops a novel method, called "average interaction depth (AID) method" to improve the imaging resolution of Compton camera by additionally considering the interaction depth of the incident photon in the absorber detector. Our simulation studies with Geant4 show that the imaging resolution of Compton camera can be signilicantly improved by using the AID method. The imaging resolution of the table-top Compton camera was improved from 9.9 mm to 7.6 mm in full width at half maximum (FWHM) for a 511 keV gamma point source. For a 364 keV gamma point source, the imaging resolution was improved more significantly, i.e., from 11.4 mm to 7.2 mm.
The residual stress of carburized and hardened gears have profound influence on durability. Residual stress of carburized and quenched steel varies with steel hardenability, carburizing processes, quench methods and c...
详细信息
With the continuous reduction of device size, layout routing has become an important factor affecting the performance and reliability of the chip, especially in consumer electronics. Good routing optimization can obta...
详细信息
ISBN:
(数字)9781728183190
ISBN:
(纸本)9781728183206
With the continuous reduction of device size, layout routing has become an important factor affecting the performance and reliability of the chip, especially in consumer electronics. Good routing optimization can obtain good chip delay performance in the last step of physical design. In this paper, interconnection based on deep submicron is studied in depth. The routing is analyzed from the perspectives of line width, line spacing and topology, and then verified by the physical simulation of layout. Finally, the results are illustrated by an operational amplifier case. This paper provides design and implementation reference for digital & analogical mixing integrated circuit designer in solving wiring.
MoS2 is a material of interest for two-dimensional (2D) field effect transistors (FETs) [1-3], however contact resistance (Rc) remains a key limiting factor. Here we present a systematic study of contact resistance to...
详细信息
ISBN:
(纸本)9781479954063
MoS2 is a material of interest for two-dimensional (2D) field effect transistors (FETs) [1-3], however contact resistance (Rc) remains a key limiting factor. Here we present a systematic study of contact resistance to MoS2 using various metals with different deposition conditions, compared to detailed simulations. We find that decreasing the metal deposition pressure improves the metal-MoS2 interface and brings Rc for Au contacts to <;1 k¦¸-¦Ìm, which is lower than previous reports with Ni, Sc, or Au [1,4]. Comparison to simulations suggest that while the contact resistivity is reasonably good (¦Ñc ?5¡¤10-7 ¦¸¡¤cm2), the lateral access resistance limits Rc in MoS2 FETs. This study is crucial for scalability of MoS2 devices, also suggesting methods to further improve Rc.
暂无评论