Search results for: Sungwon Lee

Items from 1 to 20 out of 137 results

article

Gender differences in social network of cognitive function among community‐dwelling older adults

Sungwon Lee, Seungwon Lee, Eun Lee, Yoosik Youm, more

Geriatrics & Gerontology International > 20 > 5 > 467 - 473

Aim A social network, which is a set of people connected through socially meaningful relationships, is considered protective for neurocognitive disorders. Men and women have been found to have different opportunities for social participation and it is possible social networks do not form the same way. We hypothesized, male and female social networks would have different protective influences on cognitive...

article

Estimation in a generalization of bivariate probit models with dummy endogenous regressors

Sukjin Han, Sungwon Lee

Journal of Applied Econometrics > 34 > 6 > 994 - 1015

The purpose of this paper is to provide guidelines for empirical researchers who use a class of bivariate threshold crossing models with dummy endogenous variables. A common practice employed by the researchers is the specification of the joint distribution of unobservables as a bivariate normal distribution, which results in a bivariate probit model. To address the problem of misspecification in...

article

OMRI–MAC: Optimized Multi-transmission Receiver-Initiated MAC in Underwater Wireless Sensor Networks

Eunbae Moon, Muhammad Toaha Raza Khan, Hyeongcheol Park, Syed Hassan Ahmed, more

Wireless Personal Communications > 2019 > 107 > 3 > 1491-1505

Unlike terrestrial environment, the underwater environment possess additional and complicated challenges for wireless communication. For the underwater wireless communication, traditional radio wave communication is not feasible due to high channel fading and packet loss experienced high frequency communication that also reduces the communication range. Acoustic wave communication in dynamic underwater...

chapter

Implementation of OpenAirInterface control software for 4G network

Seawon Koh, Sungwon Lee

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN) > 747 - 749

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN)

Due to the development of mobile communication, user demand and traffic increased, and various services were produced. With existing 3G networks, it was hard to demand these services and users' demand. Therefore, the 4G network has been developed. As evolving into 4G networks, much experimental and development software have been created. OAI is a hardware and software platform for 4G networks that...

chapter

p-BORE: Prioritized beacon repetition and contention window selection based MAC protocol in underwater wireless sensor networks

Eunbae Moon, Sungwon Lee, Muhammad Azfar Yaqub, Dongkyun Kim

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN) > 269 - 271

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN)

The interest of Underwater Senor Networks (UWSNs) has increased recently due to the numerous applications in ocean exploration, submarine detection, intruder detection, etc. The protocols available for terrestrial networks cannot be used due to the salient features of UWSNs such as a high error ratio, long propagation delay, high packet loss and low data rate. Considering the uniqueness of UWSNs,...

chapter

Design and implementation of YANG based wireless access point controller using RPC

Gyewan An, Sungwon Lee

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN) > 601 - 603

2017 Ninth International Conference on Ubiquitous and Future Networks (ICUFN)

Wireless network traffic explosively increased due to the increase of smart phones, tablets and IoT devices. Network users tend to prefer free WiFi over costly cellular networks. Because of this demand, people are trying to provide WiFi services in buildings or cities. This has led to the need to manage large amounts of wireless access points. However, since the AP management protocol does not exist,...

article

Enhancing the Performance of Stretchable Conductors for E‐Textiles by Controlled Ink Permeation

Hanbit Jin, Naoji Matsuhisa, Sungwon Lee, Mohammad Abbas, more

Advanced Materials > 29 > 21 > n/a - n/a

Delivery of electronic functionality to the human body using e‐textiles is important for realizing the future of wearable electronics. Printing is a promising process for large scale manufacturing of e‐textile since it enables arbitrary patterns using a simple and inexpensive process. However, conductive inks printed atop of textile are vulnerable to cracking because of the deformable and porous structure...

article

Distributed Power and Channel Allocation for Cognitive Femtocell Network Using a Coalitional Game in Partition-Form Approach

Tuan LeAnh, Nguyen H. Tran, Sungwon Lee, Eui-Nam Huh, more

IEEE Transactions on Vehicular Technology > 2017 > 66 > 4 > 3475 - 3490

The cognitive femtocell network (CFN) integrated with cognitive-radio-enabled technology has emerged as one of the promising solutions to improve wireless broadband coverage in indoor environments for next-generation mobile networks. In this paper, we study a distributed resource allocation that consists of subchannel- and power-level allocation in the uplink of the two-tier CFN comprised of a conventional...

article

An Efficient MOP Decision Method Using Hop Interval for RPL-Based Underwater Sensor Networks

Sungwon Lee, Yonghwan Jeong, Eunbae Moon, Dongkyun Kim

Wireless Personal Communications > 2017 > 93 > 4 > 1027-1041

In underwater wireless sensor networks (UWSNs), not only data packets but also sensor nodes can be lost due to ocean current, running out of battery and etc. Among various routing protocols, Routing Protocol for Low Power and Lossy Networks (RPL) is a promising routing protocol to overcome this problem since it provides multiple upward path establishments and path repair methods. However, unlike upward...

chapter

iDFR: Intelligent directional flooding-based routing protocols for underwater sensor networks

Syed Hassan Ahmed, Sungwon Lee, Junhwan Park, Dongkyun Kim, more

2017 14th IEEE Annual Consumer Communications & Networking Conference (CCNC) > 560 - 565

2017 14th IEEE Annual Consumer Communications & Networking Conference (CCNC)

In deep waters, both the natural acoustic systems (such as marine mammals) and artificial acoustic systems (like underwater sensor networks (UWSNs) and sonar users) use acoustic signals for communication, echolocation, sensing, and detection. This makes the channel spectrum, heavily shared by UWSNs posing several salient features such as narrow bandwidth, long propagation delay, and high packet loss...

chapter

Smart Crossing system using IoT

KwangEun An, Young Ju Jeong, SungWon Lee, Dongmahn Seo

2017 IEEE International Conference on Consumer Electronics (ICCE) > 392 - 393

2017 IEEE International Conference on Consumer Electronics (ICCE)

Crosswalk is a way of sharing the road between vehicle and people. However, density of the population rises, meanwhile the number of total accidents decreasing, the number of pedestrian accident does not drop down for 10 years. In this paper, we propose a new system called Smart Crossing that is another type of crosswalk using sensors, CCTV, illuminator and an IoT device to keep pedestrian in safe...

chapter

Study of distributed wireless access point controller

Gyewan An, Sangyun Han, Sungwon Lee

2017 International Conference on Information Networking (ICOIN) > 679 - 681

2017 International Conference on Information Networking (ICOIN)

In these days, as proliferating the use of mobile devices like tablet PC and smartphone, wireless AP should be distributed arrangement and cover a wide area by radio signal. There is the necessity of wireless AP controller because administrators of a wireless network can manage remotely and efficiently many APs on distributed area. The most of wireless AP has to use only one controller, so it may...

chapter

G.O.T.H.A.M. - mesh network management and visualization for batman-adv

Junho Kim, Minseok Seo, Sungwon Lee

2017 International Conference on Information Networking (ICOIN) > 435 - 437

2017 International Conference on Information Networking (ICOIN)

The mesh network has propagated rapidly, because of the Internet. All over the world, many people cannot use the Internet, because the Internet cable is not installed. So many mesh network communities try to set up the mesh network nodes and manage it. By its effort, there are more than 50 thousand mesh nodes in the world. However, there are no enough people who can make the mesh network and can manage...

chapter

A proposal of OpenFlow controller to improve transfer rate in mesh network

Seawon Koh, Junho Kim, Sungwon Lee

2017 International Conference on Information Networking (ICOIN) > 509 - 511

2017 International Conference on Information Networking (ICOIN)

In these days, the Internet is growing and the amount of user to use network increases rapidly. The mesh(ad-hoc) network has studied for many areas where people can't use the Internet. Also, mesh(ad-hoc) network is used for special purposes, and it expands its domain recently. However, low transfer rate and small coverage are a critical issue in mesh(ad-hoc) network. In this paper, it suggests improving...

chapter

EEDBR: Energy-Efficient Depth-Based Routing Protocol for Underwater Wireless Sensor Networks

Abdul Wahid, Sungwon Lee, Hong-Jong Jeong, Dongkyun Kim

Communications in Computer and Information Science > Advanced Computer Science and Information Technology > 223-234

Recently, Underwater Wireless Sensor Networks (UWSNs) have attracted much research attention from both academia and industry, in order to explore the vast underwater environment. However, designing network protocols is challenging in UWSNs since UWSNs have peculiar characteristics of large propagation delay, high error rate, low bandwidth and limited energy. In UWSNs, improving the energy efficiency...

article

Atorvastatin and rosuvastatin improve physiological parameters and alleviate immune dysfunction in metabolic disorders

Sungwon Lee, Youngjoo Lee, Jiyeon Kim, Jinho An, more

Biochemical and Biophysical Research Communications > 2016 > 478 > 3 > 1242-1247

This study was designed to characterize the potential therapeutic effects of two statin drugs commonly used to treat dyslipidemia in inflammation-linked metabolic disorders related to type 2 diabetes.Atorvastatin (10 mg/kg/day) and rosuvastatin (3 mg/kg/day) were administered to mice with diet-induced obesity (DIO). The statins lowered serum total and LDL cholesterol levels, and improved the atherogenic...

chapter

Optimizing Spectrum Sensing Time for Energy-Efficient CRSNs

Fanhua Kong, Zilong Jin, Jinsung Cho, Seokhee Jeon, more

2016 13th International Conference on Embedded Software and Systems (ICESS) > 1 - 6

2016 13th International Conference on Embedded Software and Systems (ICESS)

By cognitive radio technology, secondary users (SUs) can use licensed bands opportunistically without causing interferences to primary users (PUs). Spectrum sensing is performed by SUs to detect that PUs are present or not. Therefore, spectrum sensing is a key technology for cognitive radio (CR), and sensing time is a critical parameter for spectrum sensing performance. The longer sensing time can...

chapter

Position-freshness based intermediate node filtering for VANET

Guhyoung Kwon, Sungwon Lee, Enbae Moon, Dongkyun Kim

2016 URSI Asia-Pacific Radio Science Conference (URSI AP-RASC) > 1 - 2

2016 URSI Asia-Pacific Radio Science Conference (URSI AP-RASC)

Inter-vehicle communication has challenges caused by characteristics of vehicle. High mobility of the vehicle induce change of network topology. Many routing protocols has been proposed to address high mobility. Among them, position based routing (PBR) protocols are getting attentions as a suited method. In PBR, forwarding node select intermediate nodes based on neighbor node's position information...

chapter

Hop-interval based decision of operational mode in RPL with multi-instance

Yonghwan Jeong, Sungwon Lee, Eunbae Moon, Hyeongcheol Park, more

2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN) > 591 - 593

2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN)

The potentials of Internet of Things (IoT) are unlimited and a lot of IoT based applications have been recently explored. In IoT networks, anything can be enabled with network connectivity anytimes, and at anyplace. Path establishement from the source to the sink is an integral part of the IoT network. IPv6 Routing protocol for Low-power and Lossy networks (RPL) is a promising routing protocol for...

chapter

Constructing Infrastructure wireless network using open source

Junho Kim, Sungwon Lee

2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN) > 757 - 762

2016 Eighth International Conference on Ubiquitous and Future Networks (ICUFN)

In these days, wireless AP's signal is all around us. Multiple APs are set up at a big area, enterprise, university, movie theater, etc. and small area, such as a private house. So wireless APs are not special to us. However, the APs with several tools that can manage multiple APs are hard to find and also too expensive to the public. To solve this problem, this paper discusses how to install the...

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INFONA - science communication portal

Search results for: Sungwon Lee

Gender differences in social network of cognitive function among community‐dwelling older adults

Estimation in a generalization of bivariate probit models with dummy endogenous regressors

OMRI–MAC: Optimized Multi-transmission Receiver-Initiated MAC in Underwater Wireless Sensor Networks

Implementation of OpenAirInterface control software for 4G network

p-BORE: Prioritized beacon repetition and contention window selection based MAC protocol in underwater wireless sensor networks

Design and implementation of YANG based wireless access point controller using RPC

Enhancing the Performance of Stretchable Conductors for E‐Textiles by Controlled Ink Permeation

Distributed Power and Channel Allocation for Cognitive Femtocell Network Using a Coalitional Game in Partition-Form Approach

An Efficient MOP Decision Method Using Hop Interval for RPL-Based Underwater Sensor Networks

iDFR: Intelligent directional flooding-based routing protocols for underwater sensor networks

Smart Crossing system using IoT

Study of distributed wireless access point controller

G.O.T.H.A.M. - mesh network management and visualization for batman-adv

A proposal of OpenFlow controller to improve transfer rate in mesh network

EEDBR: Energy-Efficient Depth-Based Routing Protocol for Underwater Wireless Sensor Networks

Atorvastatin and rosuvastatin improve physiological parameters and alleviate immune dysfunction in metabolic disorders

Optimizing Spectrum Sensing Time for Energy-Efficient CRSNs

Position-freshness based intermediate node filtering for VANET

Hop-interval based decision of operational mode in RPL with multi-instance

Constructing Infrastructure wireless network using open source

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