Miracle-dz/UniFAR-FTUs huggingface dataset:
Seaport Research: An Analysis of Research Collaboration using Social Network Analysis

The collaboration of researchers has become the norm due to the increasingly interdisciplinary and complex characteristics of modern science. Many studies in informatics and various disciplines including logistics and supply chain management have explored how researchers conduct collaborative works and have shown a strong relationship between collaboration and research productivity. In seaport research, however, research collaboration has not been studied even though this may provide useful information about collaboration patterns, networks, behavior, and especially the effect on growth of port research. The purpose of this study, therefore, is to explore how maritime researchers and institutions have collaborated in port research and examine whether the collaboration has increased publishing productivity. This study uses co-authorship as an indicator of research collaboration and the number of papers as an indicator of research productivity. Using a database of academic papers published in English-language international journals for the last three decades (1980–2009), descriptive statistics show a growth in levels of co-authorship by decade and international geography of research collaboration. Social network analysis is then used to draw a map of collaboration and reveals the structure and decadal change of these collaborative networks. The analysis also shows who and which institutions have been at the center of port research and how co-authorship and collaboration have affected productivity of researchers and institutions over the period.
A brief history of design studies on innovative nuclear reactors

In a short period after the success of CP1, many types of nuclear reactors were proposed and investigated. However, soon only a small number of reactors were selected for practical use. Around 1970, only LWRs with small number of CANDUs were operated in the western world, and FBRs were under development. It was about the time when Apollo moon landing was accomplished. However, at the same time, the future of human being was widely considered pessimistic and Limits to Growth was published. In the end of 1970’s the TMI accident occurred and many nuclear reactor contracts were cancelled in USA and any more contracts had not been concluded until recent years. From the reflection of this accident, many Inherent Safe Reactors (ISRs) were proposed, though none of them were constructed. A common idea of ISRs is smallness of their size. Tokyo Institute of Technology (TokyoTech) held a symposium on small reactors, SR/TIT, in 1991, where many types of small ISRs were presented. Recently small reactors attract intere.
Adaptive frequency with power-level tracking system for efficient magnetic resonance wireless power transfer

To supply the optimum amount of required power to a load device, an adaptive frequency and power-level tracking system is proposed for an efficient magnetic resonance wireless power transfer in the high frequency band. As a result, the proposed system is able to maintain a power transfer efficiency (PTE) of more than 75% with an optimum received power-level of 88%W for any transfer distance within 0.6%m by directly monitoring the PTE and received power-level via wireless communication.
Study on Design of Air-water Two-phase Flow Centrifugal Pump Based on Similarity Law

Abstract A conventional centrifugal pump causes a drastic deterioration of air-water two-phase flow performances even at an air-water two-phase flow condition of inlet void fraction less than 10% in the range of relatively low water flow rate. Then we have developed a two-phase flow centrifugal pump which consists of a tandem arrangement of double rotating cascades and blades of outer cascade have higher outlet angle more than 90 o . In design of the two-phase flow pump for various sized and operating conditions, similarity relations of geometric dimensions to hydraulic performances is very useful. The similarity relations of rotational speed, impeller diameter and blade height are investigated for the developed impeller in the present paper. As the results, the similarity law of rotational speed and impeller diameter is clarified experimentally even in two-phase flow condition. In addition, influences of blade height on air-water two-phase flow performances indicate a little difference from the similarity relations.
Benzocyclobutene (BCB)-based spiral inductor for wireless application

This paper describes new type of MEMS spiral inductor using benzocyclobutene (BCB) for wireless applications. BCB consists of several attractive features for on-chip RF inductors, i.e., high resistivity, low dielectric constant and lower curing temperature. The fabricated inductor coils had 2.5 turns with 20μm for width, 20μm for pitch and the thickness of 2μm. The inductor coils are suspended about 12μm from the bottom BCB substrate. Our measured quality factor was 19 at 3.1GHz frequency. The measured inductance was approximately 3nH and it remained constant up to 10 GHz. The self resonant frequency (SRF) was at 13.6GHz.
DC voltage control and harmonic current suppression in a single‐phase PFC converter

This paper presents a DC voltage control scheme for a single‐phase PFC converter which can realize both the harmonic suppression of the input current and the fast dynamic response to the DC voltage. Instead of using a constant DC voltage reference, the controller calculates a fluctuating DC voltage reference, having the frequency at twice the source frequency. In the calculation of the DC voltage reference, the circuit parameters are used. Since the parameter errors may cause an error in the DC voltage reference, parameter identification is also described. The effectiveness of the proposed control algorithm has been verified experimentally. © 2002 Wiley Periodicals, Inc. Electr Eng Jpn, 141(1): 54–64, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10060
Epigenomic Landscape of Arabidopsis thaliana Metabolism Reveals Bivalent Chromatin on Specialized Metabolic Genes

Metabolism underpins development and physiology, but little is known about how metabolic genes and pathways are regulated, especially in multicellular organisms. Here, we identified regulatory patterns of 16 epigenetic modifications across metabolism in Arabidopsis thaliana. Surprisingly, specialized metabolic genes, often involved in defense, were predominantly regulated by two modifications that have opposite effects on gene expression, H3K27me3 (repression) and H3K18ac (activation). Using camalexin biosynthesis genes as an example, we confirmed that these two modifications were co-localized to form bivalent chromatin. Mutants defective in H3K27m3 and H3K18ac modifications showed that both modifications are required to determine the normal transcriptional kinetics of these genes upon stress stimuli. Our study suggests that this type of bivalent chromatin, which we name a kairostat, controls the precise timing of gene expression upon stimuli. One Sentence Summary This study identified a novel regulatory mechanism controlling specialized metabolism in Arabidopsis thaliana.
Modelling profitability and effectiveness of Greek-listed construction firms: an integrated DEA and ratio analysis

Existing research on construction performance measurement is dominated by project level studies, and the firm stakeholders require the development of models that compare performance in terms of efficiency. A new framework that integrates data envelopment analysis (DEA) and ratio analysis using a two-step approach is described to evaluate performance in terms of profitability and effectiveness of a sample of construction firms listed on the Athens Exchange. In the first step, profitability and effectiveness are assessed by employing DEA and by using the profit margin (i.e. income-to-sales ratio), respectively. In the second step, a Tobit and an ordinary least squares model are used in order to identify the drivers of profitability efficiency and effectiveness, respectively. Results do point out positive links between profitability efficiency and effectiveness. Profitability inefficiency can be explained by the size and expenses-to-total revenue ratio, whereas effectiveness can be explained only by the latter explanatory variable. The research framework may benefit not only Greek construction firms, but also firms in other countries to quantify their performance and improve their competitive advantages.
A Real-Time Embedded Blind Spot Safety Assistance System

This paper presents an effective vehicle and motorcycle detection system in the blind spot area in the daytime and nighttime scenes. The proposed method identifies vehicle and motorcycle by detecting the shadow and the edge features in the daytime, and the vehicle and motorcycle could be detected through locating the headlights at nighttime. First, shadow segmentation is performed to briefly locate the position of the vehicle. Then, the vertical and horizontal edges are utilized to verify the existence of the vehicle. After that, tracking procedure is operated to track the same vehicle in the consecutive frames. Finally, the driving behavior is judged by the trajectory. Second, the lamps in the nighttime are extracted based on automatic histogram thresholding, and are verified by spatial and temporal features to against the reflection of the pavement. The proposed real-time vision-based Blind Spot Safety-Assistance System has implemented and evaluated on a TI DM6437 platform to perform the vehicle detection on real highway, expressways, and urban roadways, and works well on sunny, cloudy, and rainy conditions in daytime and night time. Experimental results demonstrate that the proposed vehicle detection approach is effective and feasible in various environments.
Multi-directional optimisation against biomechanical criteria of a head–helmet coupling

Abstract The main function of a helmet is to reduce or to avoid injuries that may occur to the head during an impact. Today, helmets are designed to reduce headform deceleration and not optimised to reduce head injury. The aim of this work is to optimise numerically a full face helmet finite element model (FEM) based on the dynamic behaviour of its components against biomechanical criteria. After a validation with a headform FEM as used in the experimental normative tests (ECE-R022/04), the helmet model was coupled with a previously developed FEM of the human head in order to predict intra-cranial field parameters (brain pressure, Von Mises stress and global energy of the cerebro- spinal-fluid) sustained during the normative impacts (frontal, lateral rear and top impact). Results show that normative impacts led some lesions; it is the reason we propose a solution to optimise the helmet's mechanical parameters against intra-cerebral stress levels.
INTELLIGENT COMBINATORIAL AUCTION OF DECENTRALIZED TASK ASSIGNMENT FOR AGV WITH MULTIPLE LOADING CAPACITY

The need to have an efficient transportation system has attracted worldwide researches. Although there are increasing number of demands to implement distributed control system for industrial application, there is still an unexplored potential of deploying distributed transportation system. This paper focuses on dynamically assignment of transportation requests to a fleet of vehicles in a real-time manner. We introduce an improved combinatorial auction methodology to accommodate distributed tasks assignment procedure. Based on multi-agent architecture, each vehicle is represented by intelligent agent that bids for task and plans its own schedule. On the other hand, auctioneer has the objective to minimize transportation tardiness. Automated Guided Vehicle (AGV) has been selected as the case study and numerical experiments have been carried out. The result obtained shows that improved task assignment approach is able to outperform conventional task assignment substantially.
Realistic Simulation of Water Distribution System

Due to financial constraints in developing countries, water supply to various consumers is quite less than actual demand. A technique for simulation of water distribution network duly considering this low supply situation is presented. This is accomplished by satisfying an additional constraint of head-flow relationship at each node. The conventional methods just give the resulting pressures at various nodes in the prescribed demand condition. This is meaningless in a low-supply situation. The proposed method gives actual supply quantity from each node based on inherent characteristics of the system. The practical advantages are also discussed.
Design and implementation of a low-cost multiple-range digital phase detector

This article describes the design, simulation, implementation and testing of a novel low-cost multiple-range programmable digital phase detector. The detector receives two periodic signals and calculates the ratio of the time difference to the time period to measure and display the phase difference. The resulting output values are in integer form ranging from −180° to 180°. Users can select the detector pre-set operation frequency ranges using a three-bit pre-scalar. This enables to use the detector for various applications. The proposed detector can be programmed over a frequency range of 10 Hz to 25 kHz by configuring its clock divider circuit. Detector simulations were conducted and verified using ModelSim and the design was implemented and tested using an Altera Cyclone II field-programmable gate array board. Both the simulation and actual circuit testing results showed that the phase detector has a magnitude of error of only 1°. The detector is ideal for applications such as power factor measurement and correction, self-tuning resonant circuits and in metal detection systems. Unlike other stand-alone phase detection systems, the reported system has the ability to be programmed to several frequency ranges, hence expanding its bandwidth.
Fault Diagnosis of Rolling Bearing Based on Improved Independent Component Analysis and Cepstrum Theory

Based on the advantages of independent component analysis (ICA) and cepstrum, this paper adopts a novel feature extraction scheme for rolling bearing fault diagnosis utilizing improved independent component analysis and cepstrum analysis. Firstly, the fast fixed-point algorithm (FastICA) based on negative entropy was used here as the ICA approach to separate the mixed observation signals of rolling bearing vibration. Then, the largest spectral kurtosis value was used to confirm the characteristic separated signal associated with the Rolling bearing faults. Finally, cepstrum analysis was employed to deal with the selected signal to extract the original fault feature. The experimental results show that sensitive fault feature can be extracted prominently after the presented processing, and the proposed diagnostic method is effective for the fault diagnosis of rolling bearing. In addition, the proposed method provides an effective technical means for weak fault diagnosis.
Interactive control for an automatic polariscope

The problems of interpreting and analysing photo-elastic data have deterred non-specialists from making use of this technique when undertaking detailed design studies. Practical difficulties in understanding complex fringe patterns and in making the necessary optical measurements with sufficient precision have implied that considerable experience is necessary to obtain reliable stress values at internal points or across critical sections. By interconnecting two minicomputers it has been possible to develop an interactive polariscope control system which will allow the design engineer, with minimal prior knowledge of photoelastic techniques, to employ relatively sophisticated methods for evaluating the stresses in both two and three dimensional models. The data acquisition sequence involves new procedures for determining both the isoclinic angle and the isochromatic fringe number, and the interactive nature of the control system allows the desired analysis to proceed in response to the replies to a series of simple questions posed by the machine. The application of the system will be illustrated by examples of its use to determine boundary stresses at critical locations, where the high stress gradient presents problems, and in evaluating the separate stress components across the critical section of a grooved cylindrical rod.
An alternative implementation for fabricating a Schiffman phase shifter

This article presents an alternative implementation for fabricating a Schiffman phase shifter. The method consists of initially deciding the gap width between the coupled microstrip lines and using the derived equation to determine the width of the coupled microstrip lines. The proposed approach does not have to remove the ground plane underneath the coupled microstrip lines and install an additional isolated rectangular conductor under them. One Schiffman phase shifter is designed and fabricated on a double‐sided FR4 printed circuit board as an example to verify the performance of the proposed approach, and the design is simulated using Ansoft HFSS and validated by the measurements. The simulated and measured return losses are found to be better than −15 dB over the frequency band from 1.0 to 4.0 GHz and the insertion loss is within −2 dB. The bandwidth in 90° phase difference from 1.6 to 3.4 GHz is about 72%. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:9–12, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27266
Concordia Transform-Based Current Analysis for Induction Motor Diagnosis

This paper presents a new approach for bearing defect diagnosis in induction motor by taking advantage of three-phase stator current analysis based on Concordia transform. The current signature caused by bearing defect is firstly analyzed using an analytic model. Concordia transform is performed to extract the instantaneous frequency based on phase demodulation. The bearing defect feature is then identified via spectrum analysis of the variation of current instantaneous frequency. Both simulation and experimental studies are performed to demonstrate the effectiveness of proposed method in identifying bearing defects. The method is inherently low cost, non-invasive, and computational efficient, making it a good candidate for various applications.
Prestress-force monitoring of PSC girder bridges using wireless impedance sensor nodes

In this study, a technique using wireless impedance sensor node and interface washer is proposed to monitor prestressforce in PSC girder bridges. In order to achieve the goal, the following approaches are implemented. Firstly, a wireless impedance sensor node is designed for automated and cost-efficient prestress-force monitoring. Secondly, an impedance-based algorithm is embedded in the wireless impedance sensor node for autonomous prestress-force monitoring. Thirdly, a prestress-force monitoring technique using an interface washer is proposed to overcome limitations of the wireless impedance sensor node such as measureable frequency ranges with narrow band. Finally, the feasibility and applicability of the proposed technique are evaluated in a lab-scaled PSC girder model for which several prestress-loss scenarios are experimentally monitored by the wireless impedance sensor node.
Design of RFID Reader Antenna for Exclusively Reading Single One in Tag Assembling Production

A design of RFID reader antenna including a fixture, which is equipped with a chip-attaching machine producing the RFID tags, is presented. Such an antenna is constrained to read exclusively one tag only for the purpose of functional check of the whole tag when it passes the reader antenna. Namely, the other neighbor tags on the same rolling band are ignored that time. A wideband microstrip antenna is designed and a fixture with shielding material is set up for such a reading constraint. Low efficiency with high return loss is allowed for this constraint, yet wideband is still a must to treat all possible produced tags used in different countries and areas in the world.
A novel three vector sum active phase shifter design for W‐band automotive radar applications

This article presents a novel active W‐band phase shifter implemented using IHP SiGe Heterojunction Bipolar Transistor (HBT) 0.25‐µm SG25H1 technology with three vector (0°‐120°‐240°) sum technique. The integrated chip consists of a 3‐way Wilkinson power divider/combiner with 0°‐120°‐240° phase shifting lines and three low‐noise amplifiers (LNA) working at 77 GHz, which comprises a total of 1.5 × 1.1 mm2 die area. The phase shifting is based on the weighted sum of three vectors which have 120°‐angle separation so that all 360° could be scanned with simple amplitude control only. The LNAs are fabricated using IHP technology and can be used successfully in the active phase shifter design. LNA measurement results show that a variable gain of 0–14 dB at 77 GHz can be obtained by sweeping the base voltage between 1.8 and 2.3 V. The simulation results of complete system, including power dividers, phase shifting lines, LNAs, power combiners show that phase can be adjusted by 360° with a maximum gain of 1.8 dB. Input/output return loss for all the possible phase states are below 15 dB. The proposed phase shifter can be used in W‐band applications for full scan of 360°. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1715–1720, 2014
On the Economic Selection of Capacitive Compensator Sizes in Nonsinusoidal Conditions

The selection of the optimal capacitor is a multiobjective op- timization problem. An approach to solving a multiobjective optimization problem is to transform it into a single objective problem. In this letter the use of the power factor and the efficiency as constraints is proposed be- cause power factor in distributions systems may be allowed within certain limits such as 0.85 and 1.0 and similarly for the efficiency. Keywords: Harmonics, power factor, power quality. Introduction: Reference (1) discussed the different criteria for the design of the compensating capacitor for the system shown in Figure 1, taking into consideration the skin effect (a) Maximizing the power factor,
Transient Instability Detection Using Line Transient Potential Energy

Transient instability detection is investigated using a new analytical tool derived from the line transient potential energy. Instead of following the conventional approach of observing the rotor swings or comparing the critical energy and transient energy at fault clearing time, a new instability detection criterion based on the examination of the line potential energy along post-fault trajectory is developed. The main advantage of this method is that only local dynamic measurements of transmission line variables (power and phase angle differences) are required for detecting first- or multi-swing transient instability. Case studies on the 10 machine 39 bus IEEE test system showed that the proposed method is very effective and opens up new possibilities of studying transient stability and control using local transient network energy.