s.W. Lee

• Korea Electrotechnology Research Institute-KERI

Recently, solar and wind power generation have gained attention as pathways to achieving carbon neutrality, and Renewable Energy Resource Management System (RERMS) technology has been developed to monitor and control small-scale, distributed renewable energy resources. In this work, we present an Event-Triggered Transmission (ETT) algorithm for RER...

As photovoltaic (PV) systems have been successfully adopted worldwide, accurate power generation forecasting becomes increasingly essential to stable power grid operation and smart grid applications to cope with the variability of PV systems. Several data-driven models have recently been proposed for the more accurate prediction of PV power generat...

This paper proposes and validates a data-driven minute-ahead forecast model for photovoltaic (PV) generation, which is essential for real-time micro-grid scheduling. Unlike day-ahead PV forecasts that heavily rely on weather forecast information, our proposed model does not require such data as it operates in an ultra-short-term time domain. Instea...

Demand response, in which energy customers reduce their energy consumption at the request of service providers, is spreading as a new technology. However, the amount of load curtailment from each customer is uncertain. This is because an energy customer can freely decide to reduce his energy consumption or not in the current liberalized energy mark...

In this paper, we propose a new load forecasting method for smart air conditioning (A/C) based on the modified thermodynamics of indoor temperature and the unbiased finite memory estimator (UFME). Based on modified first-order thermodynamics, the dynamic behavior of indoor temperature can be described by the time-domain state-space model, and an ac...

IEC 61850, which drives to digitalize information in the entire system, is being increasingly adopted in the power utility industry, since the last decade. It is necessary for all devices communicating with distributed digital data to have a common understanding of time. As protection and control devices are directly related to the safety of the po...

Indoor wireless positioning system uses ranging information of beacons in order to precisely estimate a tag location. To estimate distance between each beacons and tag, the system calculates arrival time of a tag pulse with clock of each beacon including independent clock offset. This clock offset seriously affects the performance of ranging and po...

This paper proposes a method for mitigation of non- line-of-sight (NLOS) situations in a real time location system (RTLS) using an impulse radio ultra wide band (IR-UWB). Based on our experiment, we found that there is a slight chance to meet the line-of-sight (LOS) at all the readers of RTLS in a realistic scenario. In the NLOS environment, there...

In this paper, we show the characteristics of the threshold-based IR-UWB location positioning system by experiment. We found that this system provides distance-dependent accuracy because the arrival time of the pulse is detected by threshold using 1-bit ADC (Analog to Digital Convertor). We also propose a simple compensation method based on measure...

TR-UWB (Transmitted Reference-Ultra Wide Band) systems have low system complexity since they transmit data with the corresponding reference signals and demodulate the data through correlation using these received signals. However, the BER (Bit Error Rate) performance in the conventional TR-UWB systems is sensitive to the SNR (Signal-to-Noise Ratio)...

In this paper, we propose a simple location positioning method based on our own IR-UWB system. First, we examine the sampling characteristics of pulse-arrival-time. Second, we propose a simple location positioning method (WB-LS) based on our observation. The WB-LS method takes the sampling characteristic at each beacon into consideration when it ca...

In this paper, we focus on retransmission following transmission failure in an impulse radio ultra wideband (IR-UWB) system. The causes of transmission failure are classified and a new ldquoselfishrdquo retransmission protocol is proposed. Simulation results show that the proposed protocol improves throughput by up to 100% and decreases retransmiss...

In this paper, we present the design of the analog front end (AFE) module for power-line communication (PLC) which complies with the Korean industrial standard (KS) specifications. We measured the electromagnetic emission of the implemented AFE and verified that the measurement satisfies the regulation for PLC.

We propose a selective detection scheme based on pulse repetition considering the bit-error rate (BER) performance and complexity of noncoherent ultra-wide-band (UWB) systems. To take system complexity into account, the proposed scheme transmits the UWB signals by simple pulse repetition at the transmitter, like conventional pulse repetition coding...

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We propose a selective detection scheme based on pulse repetition considering Bit Error Rate (BER) performance and complexity of noncoherent Ultra Wide Band (UWB) systems. To consider system complexity, the proposed scheme transmits the UWB signals by pulse repetition at the transmitter, like the conventional Pulse Repetition Coding (PRC). However,...

keywords: power line communication (PLC), ASIC, analog front end (AFE) ABSTRACT Recently, in Korea, the commercialization of power line communication (PLC) is accelerated due to the testing deployment of automatic meter reading (AMR) modem using PLC. As the test site increases, the needs for analog front end (AFE) ASIC for PLC modem, which was prev...

Knowledge-based Web information system should be considered for performance with different types of mobile agents serviced by different mobile communication operators. The ubiquitous Web information server accessed by a user-group with various mobile agents should be a unified center for unified-and-ubiquitous (U2) knowledge-based Web information s...