37 research outputs found
Distributed Charging Coordination of Electric Trucks with Limited Charging Resources
Electric trucks usually need to charge their batteries during long-range
delivery missions, and the charging times are often nontrivial. As charging
resources are limited, waiting times for some trucks can be prolonged at
certain stations. To facilitate the efficient operation of electric trucks, we
propose a distributed charging coordination framework. Within the scheme, the
charging stations provide waiting estimates to incoming trucks upon request and
assign charging ports according to the first-come, first-served rule. Based on
the updated information, the individual trucks compute where and how long to
charge whenever approaching a charging station in order to complete their
delivery missions timely and cost-effectively. We perform empirical studies for
trucks traveling over the Swedish road network and compare our scheme with the
one where charging plans are computed offline, assuming unlimited charging
facilities. It is shown that the proposed scheme outperforms the offline
approach at the expense of little communication overhead.Comment: Paper for ECC 202
ASTF: Visual Abstractions of Time-Varying Patterns in Radio Signals
A time-frequency diagram is a commonly used visualization for observing the
time-frequency distribution of radio signals and analyzing their time-varying
patterns of communication states in radio monitoring and management. While it
excels when performing short-term signal analyses, it becomes inadaptable for
long-term signal analyses because it cannot adequately depict signal
time-varying patterns in a large time span on a space-limited screen. This
research thus presents an abstract signal time-frequency (ASTF) diagram to
address this problem. In the diagram design, a visual abstraction method is
proposed to visually encode signal communication state changes in time slices.
A time segmentation algorithm is proposed to divide a large time span into time
slices.Three new quantified metrics and a loss function are defined to ensure
the preservation of important time-varying information in the time
segmentation. An algorithm performance experiment and a user study are
conducted to evaluate the effectiveness of the diagram for long-term signal
analyses.Comment: 11 pages, 9 figure
Application of bronchoscopy in the diagnosis and treatment of peripheral pulmonary lesions in China: a national cross-sectional study
Predictive value of the resistance of the probe to pass through the lesion in the diagnosis of peripheral pulmonary lesions using radial probe endobronchial ultrasound with a guide sheath
BackgroundTransbronchial lung biopsy guided by radial probe endobronchial ultrasonography with a guide sheath (EBUS-GS-TBLB) is becoming a significant approach for diagnosing peripheral pulmonary lesions (PPLs). We aimed to explore the clinical value of the resistance of the probe to pass through the lesion in the diagnosis of PPLs when performing EBUS-GS-TBLB, and to determine the optimum number of EBUS-GS-TBLB.MethodsWe performed a prospective, single-center study of 126 consecutive patients who underwent EBUS-GS-TBLB for solid and positive-bronchus-sign PPLs where the probe was located within the lesion from September 2019 to May 2022. The classification of probe resistance for each lesion was carried out by two bronchoscopists independently, and the final result depended on the bronchoscopist responsible for the procedures. The primary endpoint was the diagnostic yield according with the resistance pattern. The secondary endpoints were the optimum number of EBUS-GS-TBLB and factors affecting diagnostic yield. Procedural complications were also recorded.ResultsThe total diagnostic yield of EBUS-GS-TBLB was 77.8%, including 83.8% malignant and 67.4% benign diseases (P=0.033). Probe resistance type II displayed the highest diagnostic yield (87.5%), followed by type III (81.0%) and type I (61.1%). A significant difference between the diagnostic yield of malignant and benign diseases was detected in type II (P = 0.008), whereas others did not. Although most of the malignant PPLs with a definitive diagnosis using EBUS-GS-TBLB in type II or type III could be diagnosed in the first biopsy, the fourth biopsy contributed the most sufficient biopsy samples. In contrast, considerably limited tissue specimens could be obtained for each biopsy in type I. The inter-observer agreement of the two blinded bronchoscopists for the classification of probe resistance was excellent (κ = 0.84).ConclusionThe probe resistance is a useful predictive factor for successful EBUS-GS-TBLB diagnosis of solid and positive-bronchus-sign PPLs where the probe was located within the lesion. Four serial biopsies are appropriate for both probe resistance type II and type III, and additional diagnostic procedures are needed for type I
Investigation on the microstructure and machinability of ASTM A131 steel manufactured by directed energy deposition
10.1016/j.jmatprotec.2019.116410JOURNAL OF MATERIALS PROCESSING TECHNOLOGY27
Feasibility and Reliability of Laser Powder Bed Fused AlSi10Mg/Wrought AA6061 Hybrid Aluminium Alloy Component
10.1007/s40684-022-00456-6INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING-GREEN TECHNOLOG
Microstructure and mechanical properties of additively manufactured multi-material component with maraging steel on CrMn steel
10.1016/j.msea.2020.140630MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING80
Abnormal thermal expansion behaviour and phase transition of laser powder bed fusion maraging steel with different thermal histories during continuous heating
10.1016/j.addma.2022.102712ADDITIVE MANUFACTURING5
Effect of heat treatment on the microstructure and mechanical properties of maraging steel by selective laser melting
10.1016/j.msea.2019.05.115Materials Science and Engineering A760105-11
Densification Behavior and Influence of Building Direction on High Anisotropy in Selective Laser Melting of High-Strength 18Ni-Co-Mo-Ti Maraging Steel
10.1007/s11661-020-05978-9METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE51115861-587