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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...
In recent years, detecting interactions between different genes has become a hot topic, for better understanding multigenic, complex diseases. For population-based genome-wide association studies (GWAS), a number of methods to detect gene-gene interactions such as logistic regression, multifactor dimensionality reduction (MDR) and support vector machine (SVM), have been applied. Bayesian approaches...
We propose a novel integrated framework to combine the self-learning super-resolution (SR) with dual-learning noise-reduction (NR) for compressed images. Contrary to existing learning based denoising approach, dual-learning based joint SR and NR is proposed by adding a denoised training set. It makes the proposed framework more suitable for highly compressed noise by referring to closer patch in a...
To address the environmental concerns throughout the world, many new power sources, such as renewable energy, are being introduced. In order to maintain the reliability and stability of the system while integrating these inputs, many systems have started integrating battery energy storage systems. However, the introduction of such system has been very slow due to its high capital costs. Therefore,...
This paper describes the development of Korean automatic speech recognition (ASR) system for personal assistant service in mobile phone. Methods are presented for Korean ASR word unit selection, building baseline acoustic model (AM), language model (LM) and additional optimization methods for noise robust acoustic modeling, transcription data selection and language modeling using contextual information...
Within active distribution network management, distributed generations, which are contracted by the non-firm connection method, can be directly controlled by the distribution network operator to adjust their power factor and the active power output level. This is called an output curtailment of distributed generation. Although the purpose of the output curtailment is to stably operate the distribution...
In this paper, a new stabilizing receding horizon control, based on a finite input and state horizon cost with a finite terminal weighting matrix, is proposed for time-varying discrete linear systems with constraints. We propose matrix inequality conditions on the terminal weighting matrix under which closed loop stability is guaranteed for both cases of unconstrained and constrained systems with...
Vehicle-to-vehicle (V2V) communications can complement systems based on host vehicle information and are being actively researched. We suggest a safety service models using vehicle-to-vehicle communication when vehicles move in intersection. The suggested model uses wireless access in vehicular environment (WAVE) proposed by IEEE WG 802.11 and P1609 as the V2V communication protocol. This communication...
Vehicular ad hoc networks (VANET) mean wireless networks where communication terminals in VANETs do not necessarily require infrastructures to communicate with each other. To provide Intelligent Transportation System (ITS) services in VANETs, there are lots of issues about network performances for several application types. In particular, if applications need stable link-status, there are lots of...
There are a number of challenges that need to be addressed until a wide deployment of vehicular ad hoc networks (VANETs) becomes possible. In order to support Intelligent Transportation System (ITS) service, one of those critical issues consists of the design of scalable and stable routing algorithms that are robust to frequent path disruptions caused by vehicles' mobility and buildings' shadowing...
The surface nanotopography of polymer substrates is a critical factor to regulate cellular behavior in tissue engineering approaches. In this study, nanopatterned surfaces were generated via self-assembly of polystyrene-b-poly(ethylene oxide)/dodecylbenzenesulfonic acid complex systems to control preosteoblast phenotype in vitro. Polystyrene domain sizes under 100 nm strongly affected the adhesion,...
Modern power supplies must provide reliable, high-quality power. Therefore, it is important that a transmission line fault be identified accurately, reliably and corrected as soon as possible. A method for classifying fault type based on short time Fourier transform (STFT) is provided in this paper. STFT is a means of signal processing in which a Fourier transform (FT) is performed by setting a window...
We propose an efficient cooperative ARQ (Automatic Repeat request) scheme for multi-hop underwater acoustic communications, in which cooperative nodes are used to provide more reliable alternative paths for a specific source-relay-destination connection. Based on the knowledge of inter-node distances, a cooperative region is defined to include all possible candidates for cooperative nodes from a given...
For the first time, based on the high crystalline quality of n-GaN on Si template, highly efficient InGaN/GaN LEDs grown on 4-inch silicon substrates comparable to those on sapphire substrates have been successfully demonstrated. At driving current of 350 mA, the overall output power of 1×1 mm2 LED chips exceeded 420 mW and forward voltage was 3.2 V under un-encapsulated condition, which is the best...
This paper proposes a data-driven lexicon refinement method. By expanding and polishing lexicon using local and web resources, accuracy of Chinese automatic speech recognition (ASR) system is boosted effectively. The proposed lexicon refining process is composed of two steps. First, an improved intra-word measure is introduced. It helps to expand lexicon from local text corpora. Second, the expanded...
This paper proposes an enhanced navigation algorithm using reduced particles based on incorporating particle filter with neural networks. Though in global localization, the Particle filter is useful, it needs so many particles for increasing accuracy. Increasing number of particles increases computational burden. The proposed approach which incorporates PF and the NN (RBF) increases accuracy on navigating...
We propose an efficient cooperative ARQ (Automatic Repeat reQuest) scheme for underwater acoustic communications, in which cooperative nodes are used to provide more reliable alternative paths for a specific source-to-destination connection. Based on the knowledge of inter-node distances, a cooperative region is defined to include all possible candidates for cooperative nodes from a given pair of...
Keyword-based search exploits the exact match between the index terms of a query and documents. Thus, some documents, although they are relevant to the given query, may not be returned to users unless the documents include the index terms of the query. Some search engines use the authority of documents, which is derived from the links of documents, to help keyword-based search provide more accurate...
This paper proposes a new method of modeling and simulation of a new 2 DOF parallel mechanism based on Matlab/SimMechanics. We also design a controller under the environment of Simulink and SimMechanics to satisfy the performance requirement for making the end-effector track of the reference trajectory. Simulation results and performance of the control system are presented in detail. The test results...
Traditional recommendation approaches do not consider the changes of user preferences according to context. As a result, these approaches consider the userpsilas overall preferences, although the user preferences on items varies according to his/her context. However, in our context-aware approach, we take into account not only user preferences, but also context information. Our approach can be easily...
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