A5074442084- Advanced Data Storage Technologies
- Parallel Computing and Optimization Techniques
- Caching and Content Delivery
- Distributed and Parallel Computing Systems
- GaN-based semiconductor devices and materials
- Advanced MIMO Systems Optimization
- Cloud Computing and Resource Management
- Underwater Vehicles and Communication Systems
- Advanced Wireless Network Optimization
- Semiconductor materials and devices
- ZnO doping and properties
- Cooperative Communication and Network Coding
- Advanced Computational Techniques and Applications
- UAV Applications and Optimization
- Advanced Memory and Neural Computing
- Distributed systems and fault tolerance
- Non-Invasive Vital Sign Monitoring
- Nanowire Synthesis and Applications
- Cloud Data Security Solutions
- Radiation Effects in Electronics
- Acoustic Wave Resonator Technologies
- Traffic control and management
- Green IT and Sustainability
- Optical Wireless Communication Technologies
- Water Quality Monitoring Technologies
Korea Institute of Ocean Science and Technology
2016-2025
Korea University
2009-2024
Korea University of Science and Technology
2024
Samsung (South Korea)
2013-2024
Kyungpook National University
2021
Dankook University
2006-2016
Electronics and Telecommunications Research Institute
2005-2016
University of Pittsburgh
2013
Korea Transport Institute
2012
Gwangju Institute of Science and Technology
2000-2002
Short-term prediction is one of the essential elements intelligent transportation systems (ITS). Although fine methodologies have been reported, most methods with current time-series data lead to inefficient predictions when or future either exhibit fluctuations abruptly change. In order deal this problem, a dynamic multi-interval traffic volume model, based on k-nearest neighbour non-parametric regression (KNN-NPR), introduced in study. an empirical study real-world data, input parameters...
DRAM stores information in electric charge. Because cells lose stored charge over time due to leakage, they have be "refreshed" a periodic manner retain the information. This refresh activity is source of increased energy consumption as density grows. It also incurs nontrivial performance loss unavailability memory arrays during refresh. paper first presents comprehensive measurement-based characterization study cell-level data retention behavior modern low-power chips. About 99.7% could for...
We propose a novel kernel-level memory allocator, called M3 (M-cube, Multi-core Multi-bank Memory allocator), that has the following two features. First, it introduces and makes use of notion container, which is defined as unit comprises minimum number page frames can cover all banks organization, by exclusively assigning container to core so each achieves bank parallelism much possible. Second, orchestrates frame allocation pages threads access are dispersed randomly across multiple...
Compact radar sensors for Internet of Things applications can be used to analyze indoor human gait characteristics. Conventional analysis methods typically involve generating two-dimensional (2D) high-resolution time-frequency images and employing image-processing techniques estimate parameters a walking human. However, these computations resource-intensive the compact sensors. To address this problem, we propose new scheme estimating parameters. Our method has four significant...
Kim, S.M.; Shin, J.; Baek, S., and Ryu, J.-H., 2019. U-Net convolutional neural network model for deep red tide learning using GOCI. In: Jung, H.-S.; Lee, S.; Cui, T. (eds.), Advances in Remote Sensing Geoscience Information Systems of Coastal Environments. Journal Research, Special Issue No. 90, pp. 302-309. Coconut Creek (Florida), ISSN 0749-0208.GOCI launched 2010 is a geostationary satellite image sensor that monitors ocean color. It captures 8-band spectral images northeast Asian...
In smart grid, an advanced metering infrastructure (AMI) facilitates two-way communications between meters (SMs) and a meter data management unit (MDMU). We use cellular-assisted device-to-device (D2D) to connect large number of SMs the MDMU via cluster heads (CHs). Improper clustering can affect spectral efficiency. addition, each SM CH must be provided with throughput guarantee for reliable grid operations. this paper, we formulate joint D2D formation radio resource allocation problem...
In this article, we show the development and implementation of Internet Maritime Things (IoMT) platform that supports long-range high-rate communication for remote online marine water quality monitoring. We first develop IoMT device gateway interwork with international standard Internet-of-Things (IoT) software platforms universal utilization in field The proposed play a role similar to IoT on land, but it is optimized use consideration practical characteristics using sensors ocean....
In this work, we study learning-aided adaptive control of optical beam alignment to maintain a seamless connection with high communication performance in point-to-point (P2P) underwater wireless (UOWC). To end, propose two-step two-agent deep reinforcement learning (TSTA-DRL) algorithm that enables an sensor (US) installed on the seabed sequentially determine orientation and divergence angles for transmitting its sensing data unmanned surface vehicle (USV) may irregularly shake above sea...
In this paper, we study an UAV base station (UBS) assisted cellular network that consists of a single ground macro (MBS), multiple UBSs, and terminals. We assume the MBS transmits to UBSs terminals in licensed band while use separate unlicensed (e.g., Wi-Fi) transmit For utilization propose cooperative decode-forward (DF) protocol which assist simultaneously maintaining predetermined interference level on coexisting users. our setup, formulate joint optimization problem for minimizing...
Flash memory is a storage medium that becoming more and popular. Though not yet fully embraced in traditional computing systems, prevalent embedded materialized as commodity appliances such the digital camera MP3 player we enjoy our everyday lives. This paper considers an issue file systems use makes following two contributions. First, identify cost of block cleaning key performance bottleneck for analogous to seek time disk storage. We derive define three parameters, namely, utilization,...
We mathematically analyze a sleep mode operation proposed by Samsung for IEEE 802.16 m. The downlink traffic is modeled as 2-dimensional Markov chain. obtain the power consumption of mobile station. show that station decreases cycle increases and analytical results also match with simulation very well.
Recently, interest in incorporating Storage Class Memory (SCM), which blurs the distinction between memory and storage, into mainstream computing has been increasing rapidly. In this paper, we address emerging questions regarding use of SCM. Based on an embedded platform that employs FeRAM, a type SCM, present our findings. summary, by introducing power efficiency improves while performance is degraded. We also show such degradations may be removed with operating system level schemes fully...
One characteristic of non-volatile memory (NVM) is that, even though it supports non-volatility, its retention capability limited. To handle this issue, previous studies have focused on refreshing or advanced error correction code (ECC). In paper, we take a different approach that makes use the limited to our advantage. Specifically, employ NVM as file cache and devise new scheme called amnesic management (ACM). The motivated by observation most data in are evicted within short time period...
Marine radioactivity monitoring is critical for taking immediate action in case of unexpected nuclear accidents at facilities located near coastal areas. Especially when the level contamination not predictable, mobile systems will be useful wide-area ocean radiation survey and determination radioactivity. Here, we used a silicon photomultiplier high-efficiency GAGG crystal to fabricate compact, battery-powered gamma spectroscopy that can an environment. The developed has compact dimensions...
This paper presents a 39 GHz 2×16-channel phased-array transceiver IC with compact, high-efficiency Doherty power amplifiers. The was implemented using 28-nm bulk CMOS process flip-chip packaging and evaluated 100 MHz 8-carrier component (CC) fifth-generation (5G) new radio (NR) signal (total 800 MHz). With single transformer-based compact amplifiers in transmitter (TX) path, the phased array shows excellent TX performance, achieving high average output of >8 / >9.3 dBm/ch. at...
Next Generation Cellular Networks are likely to be characterized by hyper-dense deployments wherein small-cell base stations (BSs) will cooperate together provide users with data rates of the order Gigabits per second, regardless their location in cell (Gbit/s Anywhere). Meeting goal "Gbit/s Anywhere" require rethinking fundamental mechanisms for configuring access networks and mobility management. Today's have edges these give rise undesirable effects such as low throughput, high...
Flash memory storage has been widely used in various embedded systems such as digital cameras, MP3 players, cellular phones, and DMB devices now it applies to PCs a form of SSDs. Characteristics necessitate software layer called FTL (Flash Translation Layer) that directs modified data new places maintains mapping between logical sector number physical page. We notice this out-of-place update scheme the allows low-overhead time-shifting multiple versions state. From observation, we propose...
A beamforming phased-array has become an indispensable configuration in 5 G new-radio (NR) frequency-range-2 (FR2) cellular communications to boost equivalent isotropic radiated power. In order miniaturize the phased array with high output power, a transceiver IC should be highly integrated multiple channels. Silicon-based power amplifiers (PAs) have been widely used increase degree of integration ICS; however, they still suffer from low added efficiencies at average ($\mathrm{PAE}_{\text...
Micro light-emitting diodes (μLEDs) and nano LEDs (nLEDs) are attracting considerable interest as potential candidates for next-generation displays. However, both μLEDs nLEDs encounter the major challenge of decreasing external quantum efficiency (EQE) their size diminishes. To address this issue, study explores effect localized surface plasmon (LSP) sol–gel passivation on performance blue nLED arrays. The arrays composed several designed to have same chip area μLEDs. a larger...
Flexible GaN-based microlight emitting diodes (μ-LEDs) are making a significant impact in emerging wearable technology due to their excellent performance, characterized by smaller size, fast response, low power consumption, and high luminance. However, most recent studies have focused on the separation alignment of individual μ-LEDs rigid substrates, rather than flexible substrates. This study reports fabrication, separation, horizontal rod-shaped InGaN/GaN onto an interdigitated pattern...
Koo, S.; Song, Y.J.; Lim, S.H.; Oh, M.H.; Seo, S.N., and Baek, S.J., 2019. Development of a remote supervisory control data acquisition system for offshore waste final disposal facility. In: Jung, H.-S.; Lee, Ryu, J.-H., Cui, T. (eds.), Advances in Remote Sensing Geoscience Information Systems Coastal Environments. Journal Research, Special Issue No. 90, pp. 205-213. Coconut Creek (Florida), ISSN 0749-0208.In this paper, case study implementation (RSCDA) facilities is presented. The RSCDA...
Nonvolatile memory technology is evolving continuously and commercial products such as FeRAM PRAM are now appearing in the market. As Nonvolatile-RAM (NVRAM) has properties of both storage, it can store persistent data objects while allowing fast random access. To utilize NVRAM for general purpose storing frequently updated across power disruptions, some essential features file system including naming, recovery, space management required exploiting memory-like NVRAM. Conventional systems,...
As the use of cloud computing and autonomous increases, integrity verification software stack used in a system becomes critical issue. In this paper, we analyze internal behavior IMA (Integrity Measurement Architecture), one most well-known frameworks employed Linux kernel. For verification, measures all executables their configuration files trusty manner using TPM (Trust Platform Module). Our analysis reveals that there are two obstacles IMA, measurement overhead nondeterminism. To address...