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Bucheon, South Korea

Shin D.-K.,Sahmyook University | Jung H.,Sangji University | Lee K.-D.,Yonsei University | Lee J.-H.,Inha University | Park R.C.,Samsun Company affiliated Research
Multimedia Tools and Applications

The term u-City implies a next generation information city with innovative general functions that improve the convenience and quality of city life, guarantee safety and welfare through systematic city management, and create new businesses by combining advanced information communication infrastructures and ubiquitous information services with urban spaces. A u-City constitutes a pleasant city life for urban residents as well as effective city management for city managers. u-Port businesses, which represent an ubiquitous port in which all facilities related to port operations share information without any limitations through networks, have recently been highlighted. In particular, u-Port businesses use a specific ubiquitous technology to manage containers that has been recognized as a new scale for managing port logistics. However, as conventional technology is based on sensors, which represents a disadvantage in terms of initial and maintenance costs, studies on RFID-based technologies have largely been conducted. As conductive substances such as an aluminum can, metal box, or cigarette foil packet can improve both antenna directivity as well as have great effects upon antenna performance parameters such as resonant frequencies and radiant efficiency, it is difficult to build on RFID system. Under these circumstances, implementation of a tag antenna without deterioration has become an important task. In this paper, we assess the performance of a metallic object application in an intelligent u-Port system. In the proposed design, the antenna structure consists of square-shaped power feeder connected to the body for coordination with an attached common-use tag chip, whereas the patch device is manufactured in the form of multiple meanders to efficiently scale back the size of the antenna body. The characteristics of bandwidth, efficiency, and recognition distance were compared and analyzed based on the size of the proposed antenna and the number of folds. It was found that the efficiency and gain characteristics change according to the size of the antenna, and the number of folds in the form of meanders have a significant influence over recognition distance of the antenna. © 2013, Springer Science+Business Media New York. Source

Park R.C.,Samsun Company affiliated Research | Jung H.,Sangji University | Shin D.-K.,Sahmyook University | Kim G.-J.,Konyang University | Yoon K.-H.,Catholic University of Korea
Cluster Computing

Home networks currently dominated by human–object or human–human information production, exchange, processing, and paradigms are transitioning to machine to machine (M2M) due to the sudden introduction of embedded devices. Recently, due to the spread of IT equipment, more M2M-related devices are being used, and M2M-based projects are underway in various fields such as M2M-based u-city, u-port, u-work, u-traffic, etc. M2M has been applied in various fields, and u-healthcare is attracting attention in the M2M medical field. U-healthcare refers to technology in which ordinary patients can receive prescription services from experts by continuously monitoring changes in their health status during daily life at home based on wired and wireless communications infrastructures. In this paper, we propose an M2M-based smart health service for human UI/UX using motion recognition. Non-IP protocol, not TCP/IP protocol, has been used in sensor networks applied to M2M-based u-healthcare. However, sensors should be connected to the Internet in order to expand the use of services and facilitate management of the M2M-based sensor network. Therefore, we designed an M2M-based smart health service considering network mobility since data measured by the sensors should be transferred over the Internet. Unlike existing healthcare platforms, M2M-based smart health services have been developed for motion recognition as well as bio-information. Smart health services for motion recognition can sense four kinds of emotions, anger, sadness, neutrality, and joy, as well as stress using sensors. Further, they can measure the state of the individual by recognizing a user’s respiratory and heart rates using an ECG sensor. In the existing medical environment, most medical information systems managing patient data use a centralized server structure. Using a fixed network, it is easy to collect and process limited data, but there are limits to processing a large amount of data collected from M2M devices in real-time. Generally, M2M communication used in u-healthcare consists of many networked devices and gateways. An M2M network may use standardized wireless technology based on the requirements of a particular device. Network mobility occurs when the connecting point changes according to the movement of any network, and the terminal can be connected without changing its address. If the terminal within the network communicates with any corresponding node, communication between the terminal and corresponding node should be continuously serviced without discontinuation. The method proposed in this paper can easily respond to dynamic changes in the wireless environment and conduct systematic management based on user’s motion recognition using technology to support mobility among sensor nodes in M2M. © 2014, Springer Science+Business Media New York. Source

Park R.C.,Samsun Company affiliated Research | Jung H.,Sangji University | Shin D.-K.,Sahmyook University | Cho Y.-H.,Sahmyook University | Lee K.-D.,Yonsei University
Personal and Ubiquitous Computing

As the elderly population has rapidly increased in recent years, people aged 60 and older now constitute 20-30 % of the population in developed countries. Due to reduced overall mental and physical functionality, people have developed various chronic degenerative diseases related to the circulatory and musculoskeletal systems. An aging society leads to longer life spans as well as the need to develop special residential facilities for disease treatment and support of the elderly population. In this ubiquitous age, people can obtain information regardless of place or time and therefore receive telemedicine health services anywhere and anytime. This situation requires embedded system technology for portable telemedicine devices, computer network technology for remote examination, information security technology to manage individual medical data, database technology to process and store a large quantity of medical information, expert system technology to help doctors make sound judgments, software design and test technology to create easy-to-use software, image processing technology to make accurate diagnoses based on image information, multi-searching technology to analyze complex data from various medical institutions, staff, and service providers, and context-aware technology based on wireless sensors that can be used to understand the status of users requesting a specific telemedicine health service. Therefore, in this paper, we proposed the telemedicine health service using an LTE-A-based relay antenna. The antenna proposed in this paper is a planar monopole antenna in which a feed line and a radiation patch are connected in front of a substrate and a plane ground exists opposite to a dielectric in telemedicine. Since a planar monopole antenna requires a length of lambda/4 to generate resonance, it has a demerit in size. The proposed antenna was assigned a current value close to 0 at the central part of the square loop emitter in order to supplement this demerit, and the physical length of the antenna was minimized by folding it inside the square loop center to a frequency of 900 MHz, which is the frequency of domestic SK's LTE band. In addition, coupling combination was applied at the center of the tip of the T-shape patch and the square loop line folded inside to generate a resonance of 2.4 GHz, which is the high-frequency band of the domestic LTE band. To maximize relay efficiency, relay power allocation and relay routing method were carried out. Selective transmission method was applied to improve reception of the LTE system. © 2014 Springer-Verlag London. Source

Park R.C.,Samsun Company affiliated Research | Jung H.,Sangji University | Chung K.,Sangji University | Yoon K.-H.,Catholic University of Korea
Multimedia Tools and Applications

Telemedicine health created from the combination of IT and BT technologies has received increased attention for improved quality of life in medically vulnerable regions. As the health care paradigm shifts to preventive management in diagnosis and treatment, the importance of prevention of chronic diseases such as obesity is growing. In this paper, we proposed a picocell-based telemedicine health service for the human UX/UI based on a BT-IT fusion technology considering user convenience. The proposed medical service is a BT-IT fusion technology based on the telemedicine health service that can overcome the spatial limitations of hospital-oriented medical services in order to improve user convenience while naturally combining life and medical service spaces. Human UX/UI technology, which is based on sensor network and biomedical technology, requires next generation wireless communication between devices that connects the inside of the human body with the outside. A heterogeneous network is composed within a single domain, as the frequency bandwidth used by the medical device in the ISM bandwidth is different. If a wireless device and low output ISM device spatially access a heterogeneous network, then an interference problem will occur between the small cells. Additionally, there can be interference as the traffic is off-loaded from the base station at the grouped region of a hotspot. A fatal problem may occur due to an information error of the patient due to interference. To solve the interference problem generated by the telemedicine health platform, the performance of the picocell-based telemedicine health service can be improved by applying scheduling using ABS(Almost Blank Subframe) in the time domain. Therefore, the human UX/UI and the provided guidelines can quickly provide patient information, thereby increasing safety of patients. © 2014, Springer Science+Business Media New York. Source

Shin D.-K.,Sahmyook University | Jung H.,Sangji University | Chung K.-Y.,Sangji University | Park R.C.,Samsun Company affiliated Research
Multimedia Tools and Applications

Improving traffics flow represents a critical situation due to recent increases in traffic volume, despite continuous construction and extension of highways and national roads. Therefore, an effective traffic control and management method using advanced technologies is required in order to relieve traffic congestion. An intelligent transportation system (ITS) applies advanced traffic, electronics, communication, and control technologies to various elements of transportation systems including roads, vehicles, and in order to collect, manage, and provide real-time traffic information. This can maximize the effectiveness of transportation facilities, implement increases in traffic convenience and safety, and reduce energy. A bus information system is an advanced transportation system that provides information, which is collected and processed in real-time, on operating city buses to users through advanced transportation networks. It provides bus operation management services, including route information bus location information to drivers. To ensure the accuracy of the bus information system, the structure of the receivers must be complex, as different base stations must account for buses in each region. This results in difficulty in obtaining real-time information due to the unsmooth hand-over between the base station and bus. In this paper, we carry out a performance analysis of an LTE antenna for use in an advanced bus information system. In the proposed design antenna, a particle swarm optimization method based on HFSS is used to design an LTE antenna. The aim of this paper is to design and fabricate a CPW-fed rectangular LTE antenna as well as study the effects of antenna length, width, substrate parameters relative dielectric constant, and substrate thickness on radiation parameters of band width. When the antenna was designed, a dual-band, dual-polarized antenna was used to secure bandwidth and improve performance. © 2013, Springer Science+Business Media New York. Source

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