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We present a hybrid fiber link to realize the local two-way optical frequency comparison with self-synchronization. It enables us to detect round-trip fiber noise and one-way fiber noise, and estimate the residuals. Moreover, we can check, to the best of our knowledge for the first time, the reciprocity of the accumulated noise forth and back over a bi-directional fiber, and also evaluate the noise...
We present a frequency comb-assisted experimental setup which enables us to both coherently transfer the stability and accuracy of a remote near-infrared (NIR) ultrastable laser to a mid-infrared (MIR) quantum cascade laser (QCL), and widely tune the QCL frequency for spectroscopic applications. The QCL is stabilized at the level of 2×10−15 from 1 to 100 s, with an accuracy of 10−14 after 100 s. The...
Lag compensation is widely implemented in shooter games to mitigate the impact of network latency. “Shot around a corner” is an inconsistency introduced by lag compensation that still exists in many recent titles. In this paper, we investigate the influence of network latency and movement speeds on the rollback distances, and how they in turn affect the perceived “shot around a corner” frequencies...
As the incidence of cancer continues to escalate, the demand for alternative anticancer therapeutics increases. The use of viruses in cancer treatment is well documented (1); however, as knowledge in the fields of virology, cell biology, and oncology expands, refined techniques and novel viral-based therapeutics emerge. The oncolytic potential of a wide spectrum of viruses has been explored, such...
Ballistocardiogram (BCG), which displays the mechanical activity of heart, has been a subject of interest for several years due to its advantages in taking unobtrusive physiological measurements. In the field of sleep science, researchers actively study sleep architecture and clinically apply various sleep-related conditions through BCG-derived biological information such as the heartbeat, respiration...
In this study, a robust Cu chemical mechanical polishing (CMP) process with better Cu polishing profile, lower defectivity and tighten metal line sheet resistance (Rs) control has been evaluated on a dual wafer polisher to meet the CuCMP process criteria at 28nm node. As the metal line width kept shrinking to 28nm node, the CMP correlated performance such as metal line resistance which resulted from...
This paper highlights major reliability concerns in the trend of building smartness in everything from devices to systems. It alerts engineers to determine the trade-off equilibrium of new smartness in a more practical and realistic manner. The discussion is based on several common roles of smart practices that include software; driver; and redundancy. The major concerns are expressed in five areas:...
The Standards and Calibration Laboratory (SCL) of Hong Kong has developed a primary standard of power based on sampling principle. The primary standard is used to provide calibration service for precision power meters. The measurement uncertainty is 55 × 10−6 for voltage from 24 to 480 V and current from 0.005 to 160 A and power factor from unity to 0 leading or lagging.
This project employs direct writing with an atomic force microscope (AFM) to fabricate simple graphene-based electronic components like resistors and transistors at nanometer-length scales. The goal is to explore their electronic properties for graphene-based electronics. Conducting nanoribbons of graphene were fabricated using thermochemical nanolithography (TCNL). TCNL uses a heated AFM cantilever...
The rate of increase in the number of aging population in Korea is very rapid among OECD-member countries. And fall accident is one of the most common factors that threaten the health of the elderly. Therefore, it is needed to develop a fall detection system for the elderly. Most fall detection systems use accelerometers attached on the torso. And in various studies, it was verified that these systems...
The transmission of energy is monitored in the smart grid through deploying sensors in all the components, including the overhead transmission lines. There are many poles/towers supporting a long overhead transmission line. Naturally, sensors are deployed on the location close to the poles/towers on each span. Due to the limited transmission range of the wireless transceiver module of a sensor, researchers...
An Yb optical lattice clock is under development at KRISS. Yb atoms were trapped in an optical lattice and further optimization is underway. Linewidth of the probe laser at 578 nm developed by sum frequency generation (SFG) method was reduced to less than 100 Hz. We also developed an optical frequency synthesizer (OFS) with the carrier-envelope-offset frequency locked to 0 Hz using the “direct locking...
A circular-polarized array antenna having a novel feeding structure like a substrate integrated waveguide(SIW), SIW-based power divider, and sequentially rotated cavity-backed single element is proposed for satellite communication and enhancement of electrical performances in a double-layered fabrication. The bandwidth enhancements in terms of CP generation and broadband impedance matching characteristics...
This paper deals with a coaxial-to-waveguide adapter generating circularly polarized wave to be connected with horn antennas. By combining the polarization twisting structure and the phase delay structure, the circular polarization is successfully generated in the waveguide. The designed and implemented adapter shows that the present structure can significantly reduce the size of the adapter for circularly...
We report on accuracy test results on the comparison of two different types of optical frequency combs, each of those referenced to a microwave frequency standard and an optical frequency standard. One of those combs is based on a mode-locked erbium-doped fiber laser and the other is based on a Ti:sapphire femtosecond laser. The comb comparison was carried out by measuring an absolute frequency of...
This paper describes the current status of an ytterbium lattice clock under development at KRISS. After the success of 399 nm magneto-optical-trap (MOT) at a temperature 1 mK, we constructed the 2nd stage cooling laser system at a wavelength of 556 nm to cool atoms further down to several muK. We are also developing an ultra-narrow linewidth laser at a wavelength of 578 nm to probe the clock transition...
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