Fast IPv4 scanning significantly improves network measurement and security research. Nevertheless, it is infeasible to perform brute-force of the IPv6 address space. Alternatively, one can find active addresses through candidate generated by state-of-the-art algorithms. However, probing efficiency such algorithms often very low. In this paper, our objective improve addresses. We first a longitudinal study build high-quality dataset, hitlist, including more than 1.95B distributed in 58.2K BGP...

We describe a microelectromechanical systems-based actuator for three-dimensional (3D) positioning of polymer microlens implemented using silicon-on-glass technology. The combines comb drives lateral tracking with electrostatic parallel plates out-of-plane focusing as well tilting microlens, yielding fully 3D actuation. complete is fabricated wafer bonding silicon and pyrex wafers; the lens integrated dispensing techniques. 3 DOF focusing, tracking, are experimentally characterized,...

In this paper, a model to predict the thermal effects in flashlamp-pumped direct-liquid-cooled split-disk Nd:LuAG ceramic laser amplifier has been presented. addition pumping distribution, calculates thermal-induced wavefront aberration as function of temperature, stress and deformation gain medium. Experimental measurements are carried out assess accuracy model. We expect that study will assist design optimization high-energy lasers operated at repetition rate.

Due to its advantages, such as shock resistance, low power consumption, and so on, solid state drives are considered a next generation storage device. And write amplification is very import system parameter for evaluating performance. To simplify the analytical model of adopting page-level address translation mechanism, this paper proposes probability model. Furthermore, numerical results based on our proposed also obtained. This can pose guideline first-order estimation ranges in taking...

Although recent studies have reported potential benefits of laparoscopic approach in distal pancreatectomy, reports conversion during minimally invasive pancreatectomy (MIDP) were limited.This was a retrospective study using data from Sir Run Shaw Hospital around May 2013 to December 2018. Outcomes patients who had conversions MIDP compared with successful and undergoing open (ODP).Two-hundred eighty-three cases included this study: 225 (79.5%) MIDP, 30 (10.6%) 28 (9.9%) outpatient...

This paper reports on a Joule-level multi-pass laser amplification device with diode end-pumped square-rod neodymium glass (Nd:glass) bonded to K9 glass. The generated 1.17 J pulse energy at 1 Hz and 1053 nm. optical-to-optical efficiency was 13.01%, the effective extraction 44.23%. Comparing Nd:glass of same specification without under conditions, thermal wave aberration former 85.71% that latter, which is 0.78 um. near-field modulation degree highest output 1.42 within 90% spot, far-field...

Here we report the construction of carbon quantum dots (CQDs)/Bi 4 O 5 I 2 photocatalyst with improved photocatalytic performance for methyl orange (MO) degradation under visible light.In particular, CQDs/Bi samples synthesized wt.%CQDs achieved best MO among all samples.This enhancement is ascribed to optimized CQDs content, which causes strong light adsorption and efficient electron separation Bi .According spin resonance measurement quenching experiments, • -and h + were found be main...

This study presents the hydrodynamic simulation for high energy large-size Nd:YAG liquid-cooled laser amplifier. Based on equations, heat transfer coefficient as a function of cooling fluid velocity is derived. The could be chosen 0.8m/s by considering critical Reynolds numbers laminar and turbulent flows. In order to assess uniformity fluid, four-channel model established. four D₂O channel in gain region are 98.5%, 98.7%, 98.6%, respectively. Besides, A simple built assessing...

We present PerfTrace, an end-to-end tool for efficient, real-time, and multi-metric network performance monitoring. PerfTrace provides a high integration of different existing measurement functions, supporting the essential metrics such as latency, jitter, packet loss, available bandwidth. More importantly, innovative schemes algorithms are proposed to address weaknesses tools.After conducting comprehensive evaluations, we find that (i) measures one-way two-way loss ∼9.4× faster ∼3.6× more...

One-way delay (OWD) is one of the essential network performance metrics. In large-scale resilient overlay networks (RONs), OWD measurements can be used for shortest path selection and troubleshooting. However, remain difficult because need precise time synchronization. Especially in networks, clock synchronization all nodes has always been a considerable challenge. Therefore, many cases, people use half round-trip (RTT/2) as rough substitute OWD. This paper presents an efficient...

In this paper, a millimeter wave (mmWave) antenna with wide angle scanning is proposed. The coupled feed to excite the certain current distribution same as magnetic dipole and image theory, can realize beam width larger than 120° good polarization. A 1×8 phased array designed simulation data show scan from -70° +70°, polarization side lobe level. It be applied mmWave communication systems.

In this paper, a wide scan angle phase array antenna is proposed by utilizing the magnetic dipole concept. The element composed coupled fed patch and two grounded metal strips, hence an equivalent can be obtained for obtaining radiation pattern larger than 120° in 25GHz to 28GHz band. With beam unit, $1 \times 8$ phased designed realizing scanning from −70° +70° with good cross polarization discrimination (XPD) side lobe level (SLL) less -10 dB.

The lens actuator is the important mechanical-electrical component in optical disk reading/recording system. According to error signals from pickup reading/writing process, namely focusing and tracking signals, coils as well are applied corresponding corrective current (or voltage), thus, force generated by current-on magnetic field will real-time actuate objective make spot precisely fall on disc information track, realizing data reading/writing. As wire suspension type, model determines...

Due to the non-ionizing radiation, microwave has advantage reduce injury for tissue and organs compared with X-ray CT. In most situations, however, antenna is used by directly illuminating human energy radiated into free space which leads low efficiency poor treatment effect. We proposed a planar millimeter lens could gather electromagnetic radiation limited area in superficial realize physiotherapy.

The characterization of a laser diode (LD)-pumped neodymium-doped silica glass (NDSG) is here described. gain performance and wavefront distortion were measured, the thermal toughness uniformity distribution material experimentally observed. At pumping frequency 1 Hz energy 7.79 J, small-signal 1.16 was reached 2.67 λ (wavelength = 1053 nm). 25 with 194 W power, NDSG still not cracked, which consistent its high shock parameter. However, relatively poor. These results indicate good prospects...

In global communications, severe one-way delay (OWD) asymmetry often occurs. Due to the difficulties of OWD measurement (need control both ends and synchronize their clocks), now RTT/2 is commonly used estimate OWD. However, can lead large errors in halving RTT method, which turn affects end-to-end quality service (QoS) guarantees. this paper, we investigate through large-scale measurements on a scale. The show that more than 11% network paths have OWDs with relative difference 10% compared...