Kyoung-Lae Noh

Bio: Kyoung-Lae Noh is an academic researcher from Samsung. The author has contributed to research in topics: Wireless sensor network & Clock synchronization. The author has an hindex of 12, co-authored 23 publications receiving 755 citations. Previous affiliations of Kyoung-Lae Noh include Texas A&M University.

System and method for multi-screen mobile convergence service

Abstract: PURPOSE: A system for a multi screen service of a mobile terminal and a method thereof are provided to increase the convenience of a user by easily using various services on a big screen CONSTITUTION: A first mobile terminal(201) is connected to the other device under communication state network connection conditions If the first mobile terminal is connected, a holder(203) transmits screen information received from the first mobile terminal A second display device(205) displays screen information of the first mobile terminal received from the holder A multi-functional remote control device controls an elementary function and a supplementary function of the first mobile terminal

Wireless communication system for inter-connecting an ad-hoc network and an infra structure network with liscensed band, a wireless terminal and communication method thereof

Abstract: A wireless communication system which connect ad-hoc network and IS network, a wireless terminal for the same and a communication method are provided to supply a communication service by using the permitted business carrier frequency. A search signal transmitting and receiving unit(1330) transmits probe signal in which its own terminal information is included in wireless network. The probe signal transceiver receives the response signal in which the information for the connecting network is included from a base station or the other wireless terminal receiving the probe signal. An operation mode selecting unit(1350) analyzes the answer signal and selects an operation mode which is suitable for a network status. In case the selected action mode as described above is the first mode, a controller communicates with the base station and connects to the IS network. In case the selected action mode is the second mode, the mode control part connects to the network in which the other wireless terminal belongs by using the permitted frequency band of the IS network.

Method of sharing contents by using personal cloud device, and electronic device and personal cloud system using the same

Abstract: A method of sharing content by using a personal cloud device and an electronic device and a personal cloud system using the method are provided. The method includes connecting to a personal cloud device configured to share the content with another electronic device, if a new first content is added to a set first folder, determining an upload condition of the electronic device, and if the upload condition satisfies a set condition, transmitting the first content to the personal cloud device. Accordingly, a user is able to share contents between a plurality of electronic devices by using a personal cloud device in real time.

Clock Synchronization of Wireless Sensor Networks

Abstract: Clock synchronization is a critical component in the operation of wireless sensor networks (WSNs), as it provides a common time frame to different nodes. It supports functions such as fusing voice and video data from different sensor nodes, time-based channel sharing, and coordinated sleep wake-up node scheduling mechanisms. Early studies on clock synchronization for WSNs mainly focused on protocol design. However, the clock synchronization problem is inherently related to parameter estimation, and, recently, studies on clock synchronization began to emerge by adopting a statistical signal processing framework. In this article, a survey on the latest advances in the field of clock synchronization of WSNs is provided by following a signal processing viewpoint. This article illustrates that many of the proposed clock synchronization protocols can be interpreted and their performance assessed using common statistical signal processing methods. It is also shown that advanced signal processing techniques enable the derivation of optimal clock synchronization algorithms under challenging scenarios.

Display apparatus and control method thereof

Abstract: A display apparatus includes an image processor which processes an image to display an image content; a display unit which displays thereon an image content that is processed by the image processor; and a controller which displays a user interface (UI) menu including a plurality of UI items to search the image content, as one of a two-dimensional (2D) layout by which the plurality of UI items are arranged in a 2D manner, and a three-dimensional (3D) layout by which the plurality of UI items are arranged in a 3D manner , and changes displaying the one of the layouts to display the other of the layouts according to a user's command while maintaining a continuity of the arrangement of the plurality of UI items. Accordingly, search for an image content can be efficiently performed by using a UI menu.

A New Approach for Time Synchronization in Wireless Sensor Networks: Pairwise Broadcast Synchronization

Abstract: This letter proposes an energy-efficient clock synchronization scheme for Wireless Sensor Networks (WSNs) based on a novel time synchronization approach. Within the proposed synchronization approach, a subset of sensor nodes are synchronized by overhearing the timing message exchanges of a pair of sensor nodes. Therefore, a group of sensor nodes can be synchronized without sending any extra messages. This paper brings two main contributions: 1. Development of a novel synchronization approach which can be partially or fully applied for implementation of new synchronization protocols and for improving the performance of existing time synchronization protocols. 2. Design of a time synchronization scheme which significantly reduces the overall network-wide energy consumption without incurring any loss of synchronization accuracy compared to other well-known schemes.

Clock Synchronization in Wireless Sensor Networks: An Overview

Abstract: The development of tiny, low-cost, low-power and multifunctional sensor nodes equipped with sensing, data processing, and communicating components, have been made possible by the recent advances in micro-electro-mechanical systems (MEMS) technology. Wireless sensor networks (WSNs) assume a collection of such tiny sensing devices connected wirelessly and which are used to observe and monitor a variety of phenomena in the real physical world. Many applications based on these WSNs assume local clocks at each sensor node that need to be synchronized to a common notion of time. This paper reviews the existing clock synchronization protocols for WSNs and the methods of estimating clock offset and clock skew in the most representative clock synchronization protocols for WSNs.

Joint Time Synchronization and Localization of an Unknown Node in Wireless Sensor Networks

Abstract: Time synchronization and localization are two important issues in wireless sensor networks. Although these two problems share many aspects in common, they are traditionally treated separately. In this paper, we present a unified framework to jointly solve time synchronization and localization problems at the same time. Furthermore, since the accuracy of synchronization and localization is very sensitive to the accuracy of anchor timings and locations, the joint time synchronization and localization problem with inaccurate anchors is also considered in this paper. For the case with accurate anchors, the joint maximum likelihood estimator and a more computationally efficient least squares (LS) estimator are proposed. When the anchor timings and locations are inaccurate, a generalized total least squares (GTLS) scheme is proposed. Crame?r-Rao lower bounds (CRLBs) and the analytical mean square error (MSE) expressions of the LS based estimators are derived for both accurate and inaccurate anchor cases. Results show that the proposed joint estimators exhibit performances close to their respective CRLBs and outperform the separate time synchronization and localization approach. Furthermore, the derived analytical MSE expressions predict the performances of the proposed joint estimators very well.