124 research outputs found
A Realistic Decision Making for Task Allocation in Heterogeneous Multi-agent Systems
No full textAbstractTask allocation is one of the keys to maximize organizational benefits by handling as many tasks as possible. Many computational multi-agent systems use agent's capability for task allocation. When a task arrives at the queue to be delivered a task allocator will determine which takes the task by finding the best-capable agent. In real world situation, each agent should not only consider the new task with their capability, but also tasks that they are currently handling before sending their capability to the task allocator. This research study proposes a CPU-scheduling based algorithm to allow agents to perform rational decision making when they think that they can handle the new task while taking care of its current tasks. The result shows that applying algorithm provide a significant improvement of their performance
Curvature-based interface restoration algorithm using phase-field equations
No full textIn this study, we propose a restoration algorithm for distorted objects using a curvaturedriven flow. First, we capture the convex-hull shaped contour of the distorted object using the mean curvature flow. With the supplemented mass on the captured feature, we evolve the constraint mean curvature flow to a steady state, preserving the non-distorted region. With respect to the mass, we select a restorative shape by considering the square of the curvature derivative. The Allen-Cahn and Cahn-Hilliard equations are applied to the generated restored image from the implicit curvature motions represented by the order parameter. We impose the Dirichlet boundary condition for the order parameter and the Neumann boundary for the chemical potential to fix the feature and to inherit the mass conservation, respectively. We provided examples of the restoration of half-circle and parentheses-shaped objects to reconstruct a circle shape. © 2023 Lee, Choi. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.11Nsciescopu
Characteristics of two-dimensional MoS2 grown on GaN substrates by metal-organic chemical vapor deposition
No full textReasons for Turnover Intention among Direct Care Workers in Korea’s Long-Term Care Insurance
No full textThis study explored reasons for turnover intention among direct care workers under the Korean long-term care insurance (LTCI) system. The author conducted semi-structured interviews with 19 care workers. The study revealed four main themes underlying the intention of care workers to change or leave their jobs. Care workers struggled with demanding working conditions, and their salaries were low. Moreover, the relationships with their directors and supervisors was not good, since some care workers felt that their directors despised them or gave them inappropriate instructions, and their supervisors did not complete administrative work fairly. Lastly, some workers’ health conditions prevented them from carrying out their care work. The results have implications for working practices of care workers, prices of LTCI services, training of directors and supervisors, and coverage of occupational health and safety insurance for care workers
Multiparametric investigation on NOx removal from simulated diesel exhaust with hydrocarbons by pulsed corona discharge
No full textThe influence of temperature and hydrocarbon additives on NOx removal and CO production has been studied by numerical modelling and process experiments for a synthetic gas mixture consisting of N2, O2, H2O and CO2
in a pulsed corona reactor. The NO reduction of more than 99% was achieved at the energy cost of ∼14 eV per NO molecule in the presence of 550 ppm C3H6 additive at T = 393 K. The simulated results agree well with
the experimental data measured in the NO and NOx removal and C2H4 and C3H6 decomposition. Within a limited framework of non-uniform
modelling approach, the temperature effect on the streamer nature discharge has been taken into account. Main reaction paths for the C2H4 and C3H6 decomposition and leading reactions of NOx conversion, CO, CH2O, CH3CHO productions are presented. Calculated concentrations of some by-products are given. The effect of the C3H6 + O reaction on the NOx oxidation and C3H6 decomposition using several channels and their rate
constants taken from the literature has been examined numerically. The best fitting data for the C3H6 + O reaction are chosen.Supported by the Korea Institute of Science and Technology Evaluation and Planning (KISTEP) and Seoul National University (SNU)
Application of Back-Step Coanda Flap for the Supersonic Co-flowing Fluidic Thrust Vector Control
No full textA Study on the Performance of the Fluidic Thrust Vector Control Utilizing Supersonic Coanda Effects
No full textInterstellar: Fully Partitioned and Efficient Security Monitoring Hardware Near a Processor Core for Protecting Systems against Attacks on Privileged Software
No full textThe existing approaches to instruction trace-based security monitoring hardware are dependent on the privileged software, which presents a significant challenge in defending against attacks on privileged software itself. To address this challenge, we propose Interstellar, which introduces a partitioned hardware near the CPU’s main core and leverages the benefit of hardware-level security monitoring. Interstellar is fully partitioned, parallelized, and simultaneously detecting security monitoring hardware. Interstellar’s design makes it hard for malicious software to reverse-engineer how Interstellar detects the attacks, and Interstellar efficiently protects the system against the attacks on the privileged software (e.g., Trusted Execution Environment (TEE)). Moreover, Interstellar not only monitors but also blocks various attacks in a timely manner without stalling a CPU core by designing with a finite-state machine.
We implemented a prototype of Interstellar in Rocket chip using a hardware description language and evaluated Interstellar with a Linux kernel and a custom TEE-equipped Linux kernel for Rocket chip on two different FPGA boards. The performance overhead of Interstellar is negligible for benchmark applications. The average performance overhead incurred from Interstellar on 50MHz Rocket core for three different benchmarks is 0.102%
Experimental data of inorganic gel based smart window using silica sol–gel process
No full textAbstractIn this article experimental data are presented for inorganic gel based smart window fabricated using silica sol–gel process. Parallel beam transmittances were measured as functions of voltages for samples fabricated with different concentrations of nitric acid. Spectroscopic transmittance data at different driving voltages for samples fabricated with different LC concentrations are shown. Transmittance spectra of the Si–Ti based gel-based-liquid-crystal (GDLC) device measured as different driving voltages were compared with those of PDLC. GDLC showed much lower operating voltages, 10–15V, for on-state. Formation of the LC droplet in gelation process is illustrated. The methyl organic group surrounds LC droplets. Demonstration of GDLC based smart window showed the successful operation with low driving voltages. GDLC window shows clear color, even at off-state, compared with PDLC
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