PASSIVATION, TRANSISTORS, MAGNITUDE (Mathematics), METHACRYLATES, and TRUCK maintenance & repair
Bottom gated thin-film transistors (TFTs) with various sputtered SnO active layer thicknesses ranging from 10 to 30 nm and different passivation layers have been investigated. The device with 20 nm SnO showed the highest on/off ratio of 1.7 × 104 and the smallest subthreshold swing of 8.43 V dec−1, and the mobility (0.76 cm2 V−1 s−1) was only slightly lower than in TFTs with a thicker SnO layer. However, both the mobility and the on/off ratio of the 15 nm SnO TFT dropped significantly by one order of magnitude. This indicated a strong influence of the top surface on the carrier transport, and we thus applied an organic or an inorganic encapsulation material to passivate the top surface. In the 20 nm TFT, the on/off ratio was doubled after passivation. The performance of the 15 nm TFT was improved even more dramatically with the on/off ratio increased by one order of magnitude and the mobility increased also significantly. Our experiment shows that polymethyl methacrylate passivation is more effective to reduce the shallow trap states, and Al2O3 is more effective in reducing the deep traps in the SnO channel. [ABSTRACT FROM AUTHOR]
POSTURAL muscles, MEASUREMENT errors, ONE-leg resting position, INTRACLASS correlation, RELATIVES, RELIABILITY in engineering, and TRUCK maintenance & repair
Purpose The aim of this study was to analyse absolute and relative reliability of a number of postural static stability measures obtained from a GYKO inertial sensor system in young adults. Methods The study examined 29 healthy non-athlete young adults. A test was performed for 30 s while standing on one foot, without moving, with eyes open and arms relaxed along the sides of the body. The examinations were performed twice, with a one-week interval. Relative reliability was measured using the intraclass correlation coefficient (ICC) and the 95% confidence interval (95% CI), whereas the absolute reliability was evaluated based on the standard error of measurement (SEM) and the minimal detectable change (MDC). Results The results of this study showed moderate to good relative reliability scores for all the postural stability measures, with ICC values ranging from 0.62 to 0.70. For most of the analysed variables, SEM% ranged from ca. 10% to 14%. Relatively high SEM% values were obtained only for two variables (Area, Convex Hull Area). Conclusions The low costs of GYKO inertial sensor systems, the fast and easy installation, the mobility and high reliability of the measurement of postural stability show that it can be effective alternative to stabilographic platforms. [ABSTRACT FROM AUTHOR]
Mirnenko, Volodymyr, Pustovyi, Serhii, Radko, Oleg, and Yablonskyi, Petro
Journal of Konbin. Mar2020, Vol. 50 Issue 1, p269-281. 13p.
FALSE positive error, CONDITION-based maintenance, MILITARY supplies, MILITARY miniatures, MATHEMATICAL models, INDUSTRIAL equipment maintenance & repair, and TRUCK maintenance & repair
For military equipment products maintained according to the condition-based operation strategy with control of parameters a mathematical model is constructed using semi-Markov random process. The diffusion-monotonic distribution law which is inherent in mechanical type products is taken for the fault model. The model takes into account type I errors. The analytical dependence of the utilization factor on the parameters of the scale and shape of the diffusion-monotonic distribution, the of regulated maintenance periodicity, the duration of complete restoration of a sample of equipment, the reliability of its control, is established. Graphs of the dependence of the utilization factor on the given parameters of the model are shown. [ABSTRACT FROM AUTHOR]
B Army researchers have discovered a way to monitor the performance of 3D printed parts, which tend to have imperfections that affect performance in ways traditionally-machined parts do not. b A new study showed that the U.S. Army could detect and monitor the wear and tear of 3D printed steel through sensor measurement. PHOTO (COLOR) "The strain or eddy current sensor would supply a measurement and let you know the part needs replaced", said Dr. Todd C. Henry, a mechanical engineer at the laboratory who co-authored the study. [Extracted from the article]
ASSEMBLY line balancing, ASSEMBLY line methods, BENCHMARK problems (Computer science), BRANCH & bound algorithms, NP-hard problems, TRUCK maintenance & repair, and BUSES
In the two-sided mixed-model assembly line, there is a process of installing two single stations in each position left and right of the assembly line with the combining of the product model. The main aim of this paper is to develop a new mathematical model for the mixed model two-sided assembly line balancing (MTALB) generally occurs in plants producing large-sized high-volume products such as buses or trucks. According to the literature review, authors focus on research gap that indicate in MTALB problem, minimize the length of the line play crucial role in industry space optimization.In this paper, the proposed mathematical model is applied to solve benchmark problems of two-sided mixed-model assembly line balancing problem to maximize the workload on each workstation which tends to increase the compactness in the beginning workstations which also helps to minimize the length of the line. Since the problem is well known as np-hard problem benchmark problem is solved using a branch and bound algorithm on lingo 17.0 solver and based on the computational results, station line effectiveness and efficiency that is obtained by reducing the length of the line in mated stations of the assembly line is increased. [ABSTRACT FROM AUTHOR]
The article presents the views of Robert Burns, Managing Director of Robert Burns Ltd., on record of working with some big blue-chip businesses for many years undoubtedly places us at the higher end of the market. Topics include the Robert Burns one-truck business being traction-only for then Irish reefer specialist Interland Transport, and the Northern Ireland-based that first truck came from Dennison Commercials at Ballyclare.
Przybysz, Kamil, Dygnatowski, Sławomir, and Grzesik, Norbert
Journal of Konbin. Oct2019, Vol. 49 Issue 3, p527-546. 20p.
RELIABILITY in engineering, SYSTEMS availability, MILITARY vehicles, FACTOR analysis, PROCESS optimization, DECISION making, MOTOR vehicle maintenance & repair, and TRUCK maintenance & repair
The paper describes issues related to reliability of military vehicles based on recorded operational events. Seeking the quantification of reliability for exploiting vehicles in military units, an extensive analysis of factors shaping the reliability level was made, taking into consideration all phases of military vehicles existence and a peculiar character of the exploitation process of military vehicles. The importance of reliability research in the decision process optimization was emphasized, controlling the efficiency and availability of the exploitation system. [ABSTRACT FROM AUTHOR]
DRIVERLESS cars, RELIABILITY in engineering, AUTOMATED guided vehicle systems, TRUCK maintenance & repair, LEAD time (Supply chain management), and EVALUATION methodology
In the Internet of Vehicles (IoV), with the increasing demand for intelligent technologies such as driverless driving, more and more in-vehicle applications have been put into autonomous driving. For the computationally intensive task, the vehicle self-organizing network uses other high-performance nodes in the vehicle driving environment to hand over tasks to these nodes for execution. In this way, the computational load of the cloud alleviated. However, due to the unreliability of the communication link and the dynamic changes of the vehicle environment, lengthy task completion time may lead to the increase of task failure rate. Although the flooding algorithm can improve the success rate of task completion, the offloading expend will be large. Aiming at this problem, we design the partial flooding algorithm, which is a comprehensive evaluation method based on system reliability in the vehicle computing environment without infrastructure. Using V2V link to select some nodes with better performance for partial flooding offloading to reduce the task complete time, improve system reliability and cut down the impact of vehicle mobility on offloading. The results show that the proposed offloading strategy can not only improve the utilization of computing resources, but also promote the offloading performance of the system. [ABSTRACT FROM AUTHOR]
COAL mining, DUMP trucks, MINERAL industries, COAL industry, CRITICAL analysis, and TRUCK maintenance & repair
This paper presents the reliability and performance assessment of articulated dump trucks (ADT) by using Weibull distribution as well as the determination of the lifetime component. The inspection for heavy duty equipment, which operates in coal mining is of particular interest. The main focus of this research is on assessing ADT’s component technical conditions, which is usually performed based on a fixed periodical basis. The sample of 32 ADT units at one of the coal sites in North Borneo is used as a reference with respect to the database of the spare part replacement collected during 2 years (2015-2017). The analysis shows that the critical components have been successfully identified. In addition, the lifetime of such component have also been predicted. [ABSTRACT FROM AUTHOR]
ANTENNAS (Electronics), LUMPED elements, TESTING, ARMED Forces, TEST methods, and TRUCK maintenance & repair
A lumped model of the rod antenna measurement setup adopted in the automotive (CISPR 25 ALSE test method) and military testing (MIL-STD 461 RE102 test method) is derived here. The model permits to get immediate physical insight into the different behavior observed when the counterpoise of the rod antenna is connected to the shielded enclosure or floated, as recently suggested by some authors for the purpose of improving measurement reproducibility. A new test configuration is also investigated here for the same purpose. The model is valid up to a few megahertz, where the lumped element approximation is effective. Several experimental results confirming the lumped model predictions and extending the investigated frequency range up to 30 MHz are offered. [ABSTRACT FROM AUTHOR]
RESOURCE allocation, SPECTRUM allocation, POWER spectra, POLYNOMIAL time algorithms, INFORMATION sharing, REDUNDANCY in engineering, TARDINESS, and TRUCK maintenance & repair
In vehicular communications, safety-critical information exchange has stringent reliability and latency requirements. However, lack of accurate instantaneous channel state information due to high mobility poses a great challenge to meet these requirements and the situation gets more complicated when packet retransmission is considered. Based on only large-scale fading channel information, we perform spectrum and power allocation to maximize the sum ergodic capacity of vehicular-to-infrastructure (V2I) links, while guaranteeing reliability and latency requirements of vehicular-to-vehicular (V2V) links. First, for each possible V2I–V2V spectrum reusing pair, we analyze the queueing system for the V2V link and derive the packet loss probability and average packet sojourn time under fixed power allocation. Then, an optimal power allocation is derived for each possible pair. Afterwards, we optimize the spectrum reusing pattern by addressing a polynomial time solvable bipartite matching problem. Simulation results confirm the accuracy of the proposed queueing analysis. Moreover, the proposed resource allocation strategy can improve the ergodic capacity of the V2I links under the precondition of guaranteeing the V2V links’ requirements on reliability and latency. [ABSTRACT FROM AUTHOR]
An interview with Peter Falco and Rory Mulholland of scenic company Global Scenic Services, is presented. Among the issues they discussed include their experience of working closely with scenic designer Clint Ramos constructing his set for the Boradway play "Grand Horizons," the automation and scenic solution they employed for the end of Act 1 finale where a U-Haul van is crashed through the kitchen wall of the set, and the challenges they experienced in getting the certain look of the set.
The article focuses on maintenance program in plant or warehouse needs maintenance, repair and operations (MRO) program on call to keep it running specially in ecommerce. Topics discussed include maintenance of spare parts management and automated systems or lift trucks, MRO accounted for supply chain spend for facilities, and equipment reliability which is essential for productivity.
PICKUP trucks, AUTOMOBILES, TRUCK maintenance & repair, TRUCK engines, and MODEL trucks
The article highlights some disassemble required for Ram 3500, a pickup truck. Topics include Ram 3500 which represent stunning piece of engineering which include metallic-red sheetmetal and deep-black leather; providing five onboard cameras, a massive tombstone infotainment screen; and new crank and forged rods which help to deal with the extra boost and redesigning cast-iron cylinder.
Journal of Konbin. Mar2019, Vol. 49 Issue 1, p405-423. 19p.
MILITARY vehicles, FUNCTIONAL analysis, MARKOV processes, RELIABILITY in engineering, STOCHASTIC processes, MOTOR vehicle maintenance & repair, and TRUCK maintenance & repair
The paper pertains to matters related to the quantification of functional availability of military vehicles, with reference to exploitation intensity and reliability aspects. The conducted exploitation research paved the way for elaborating methods of determining functional availability for military vehicles, in particular focusing on exploitation intensity and reliability. The essential research was conducted using the developed mathematical model based on the probabilistic, stochastic Markov process, which allowed modelling the process of changes in the exploitation states of military vehicles. In the course of the research, which enabled the authors to estimate the functional availability value, four-layered probes of the military vehicles were used (different types and makes), from the second exploitation phase, with varied mileage from the beginning of the exploitation and average mileage per year. [ABSTRACT FROM AUTHOR]
WIRELESS hotspots, QUALITY of service, TRUCK maintenance & repair, RELIABILITY in engineering, and ENERGY consumption
In a vehicular network with high mobility, it is challenging to ensure reliable and efficient connections among vehicles and between vehicles and roadside communication units (or infrastructure) such as base stations or WiFi hot spots. In this paper, we propose a method that utilizes cooperative communications for a combined vehicle-to-infrastructure (V2I) with vehicle-to-vehicle (V2V) approach to improving quality of service (QoS) across the vehicular network. In this approach, we have obtained the closed-form expressions of key QoS performances such as outage probability, throughput, energy efficiency, packet delivery ratio, packet loss rate and average end-to-end-delay for different investigated transmission schemes. These performances can be optimized by adaptively selecting appropriate transmission schemes and, as a results, good trade-offs between system reliability and efficiency can also be achieved under various environmental conditions. [ABSTRACT FROM AUTHOR]