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We report enhanced interlayer excitonic systems, excitons and trions, in trilayer transition metal dichalcogenides heterostructrues with photoluminescence spectroscopy. We investigate interlayer trion binding energy and carrier lifetime of interlayer excitons and trions.
Naval surface fleets of the United States and its allies rely on multiple satellite communication systems (SATCOM) for onboard communication with other entities such as ships, shore nodes and hosts from external networks. Current practice is for an onboard ship router to select a particular SATCOM link for each outgoing traffic flow based on a mission-specific routing policy. In this paper we propose...
This paper reports the development of a nano-gap vapor sensor that is capable of detecting an airborne target in a repeatable manner in near-zero static power consumption. The nano-gap sensor employed a matching gap distance of 5.8 nm to the lengths of both linkers and targets for selectivity. The nano-gap sensor was fabricated based on deposition and removal of a thin sacrificial layer via atomic-layer-deposition...
We demonstrate the fabrication and testing of a microfabricated light sensor that can detect the light direction within a ±30° cone. The sensor consists of a quad silicon photodiode array formed on a p+ well. The photodiode array is covered with a microfabricated 287 μm-high light blocking cap containing a 500 μm diameter ball lens. The lens focuses light onto the quad array producing different light...
This paper deals with an effective method to maximize the characteristics of a MIMO antenna system for cars. This stems from the improvement of isolation between the two radiators. A metamaterial kind of decoupling device which is a modified SRR curbs the unwanted interaction between the MIMO elements. New flat dual-band monopoles with the interference-reduction device for the MIMO system are suggested...
Scanning acoustic microscopy is a well-accepted modality for forming quantitative 2D maps of acoustic properties of soft tissues at microscopic scales. In our studies, the sample is raster-scanned with a spatial step size of 2 μm using a 250 MHz transducer resulting in 3D RF data cubes. Each RF signal is processed to obtain, for each spatial location, acoustic parameters, e.g., the speed of sound...
Due to the aging of electric power facilities and the increase in electric power demand, the operation and maintenance of electric power facilities is becoming an important issue. Currently, power Oil-Filled(OF) cables for underground system in South Korea have an average lifetime of 20 years and cables used for more than 25 years are about 20%. In this paper, the lifetime of Oil-Filled(OF) cables...
Benefits of integrated HTS power system and the associated cryogenic systems are discussed. A versatile modelling methodology developed to assess the system level implications of various potential configurations of for connecting multiple HTS devices is described. Case studies involving a hypothetical HTS system with a generator, a motor and a power cable is used to demonstrate the usefulness of the...
Superconducting gas-insulated transmission lines (S-GIL) are introduced for shipboard power applications as a lightweight and energy efficient alternative to conventional power distribution cables. Requirements for naval ship power distribution and the corresponding design options for S-GIL are presented. Needs for further developments for meeting the power density requirements for US Navy all-electric...
The reliability of medium voltage (MV) motors used for driving pumps, fans, and other loads in the power generation industry is critical for continued power production. Periodic testing of stator winding insulation, which is the most vulnerable component in MV motors, is an essential part of predictive maintenance for preventing unplanned reduction in the power generation capability. Korea Electric...
In this paper, we present artificial neural network (ANN) models to predict hard and soft-responses of three configurations of arbiter based physical unclonable functions (PUFs): standard, feed-forward (FF) and modified feed-forward (MFF). The models are trained using data extracted from 32-stage arbiter PUF circuits fabricated using IBM 32 nm HKMG process. The contributions of this paper are two-fold...
Currently, to observe entire Korean peninsula, two operational S-band radar networks have been operated by the KMA and the MOLIT. In this paper these two radar networks will be described in aspects of their goals and collaboration. In addition, two research X-band radar networks which will be deployed in Seoul and western sea side of Korean peninsula will be introduced.
We examine the feasibility of utilizing RoF-based fronthaul network for the next-generation mobile communication systems. For this purpose, we evaluate the effects of the dispersion-induced RF power fading, CSO distortions induced by the interplay between the laser chirp and fiber dispersion, and MPI noises induced by optical reflections, etc.
Open Phase Condition (OPC) on nuclear power system has been reported from various countries of the world, so it is necessary to analyze the design suitability of protection system for OPC in Korean nuclear plant also. In this thesis, the OPC for Korean new nuclear plants is conspired using Electrical Power System Analysis & Operation Software (ETAP) and the operation possibility of protecting...
Power generation using renewable energy is attracting attention in order to secure sustainable and eco-friendly energy source. Among them, solar power generation market shows rapid growth. However, due to shadows caused by elevation angle variation of the sun according to season, solar panels should be installed with certain distance between each other in succession, which causes wide unused space...
The start-up value of an SRAM cell is unique, random, and unclonable as it is determined by the inherent process mismatch between transistors. These properties make SRAM an attractive circuit for generating encryption keys. The primary challenge for SRAM based key generation, however, is the poor stability when the circuit is subject to random noise, temperature and voltage changes, and device aging...
Counterfeit ICs pose a threat to designing secure and reliable electronic systems. To better detect and prevent counterfeit ICs from entering the supply chain, an eflash based powerless non-volatile sensor using floating-gate (FG) technology is demonstrated in a 0.35μm standard logic process. By exposing the FG to the environment, the proposed sensor can record any physical tamper attempt affecting...
An all-digital 2-tap half-rate time-based decision feedback equalizer (TB-DFE) was demonstrated on a 10mm on-chip serial link. Implemented in a 65nm GP technology, the transmitter and receiver achieve an energy-efficiency of 31.9 and 45.3 fJ/b/mm, respectively, at a data rate of 10Gb/s. A Bit Error Rate (BER) less than 10−12 was verified for an eye width of 0.43 Unit Interval (UI) using an in-situ...
A novel BSC circuit with tunable current starved buffers demonstrates higher sensitivity, scalability & accurate statistical characterization of radiation-induced SET pulse waveforms & flip-flop SER in 14nm tri-gate CMOS, thus enabling improved SER estimation & analysis for a range of supply voltages including NTV.
A novel BSC circuit with tunable current starved buffers demonstrates higher sensitivity, scalability & accurate statistical characterization of radiation-induced SET pulse waveforms & flip-flop SER in 14nm tri-gate CMOS, thus enabling improved SER estimation & analysis for a range of supply voltages including NTV.
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