• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.1
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• pp.23-30
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• 2014

Recently, Light Emitting Diode(LED) light is changing the light equipment, which was considered just as a power-controlled device in home-network, into a IT convergence device by combining illumination function with wireless communication. As a result, Visible Light Communication(VLC) becomes a more practical solution to ubiquitous networks due to the more spread of LED light. One of representative applications using VLC is a VLC-based indoor navigation system which can provide high-accuracy indoor localization. In this paper, we model and implement a VLC based-indoor navigation system in which a fluorescent light type of LED lamp, which is normally used in large buildings, and smart devices, which are usually used by users, are utilized as main components for indoor navigation. Subsequently, it is expected that the paper can contribute to make VLC applications be more active.

• Journal of the Korean Institute of Intelligent Systems
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• v.26 no.1
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• pp.82-86
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• 2016

This paper proposes a method for the immobilization of motorbike brakes in conjunction with near-field communication (NFC) technology in order to meet the increasing demand for security and convenience of motorbike drivers. We thought about the concept of wireless key, NFC security devices and automatic solenoid valve for setting the lock and unlock module. This paper propose the design and development of an innovative anti-theft alarm system for motorcycles using NFC smart devices based on RFID system, the basis of IoT and AES(advanced encryption standard) encryption Algorithm. The design concept is based on NFC communication strategy between the vehicle and owner. To do this concept, we designed motorcycle smart key system with general-purpose NFC system and the automatic solenoid valve for setting the lock and unlock module. First, we designed control unit and NFC card reader for motorcycle smart key system. Then we propose an AES encryption algorithm and prove that the motorcycle key system is controllable by showing the result of implementing and testing, after installing.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.6
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• pp.1263-1270
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• 2021

Recently, in the food culture life, the trend of consumers cooking is changing, and the use rate of induction cookware is increasing. Therefore, in this study, we propose the development of a functional auxiliary device to improve the safety of induction cookware to improve the convenience of cooking according to the increase in the cooking population. The proposed device is linked with IoT through the app. Through the app, the device can control the induction heating power adjustment and time reservation. In addition, an ultrasonic sensor is used to prevent the container from overflowing during cooking, and the user can safely use induction through the fine dust sensor. The implemented device conducts research assuming the actual cooking situation. Finally, it was confirmed that the user's fatigue was reduced during cooking through the device and the user's safety was improved in emergency situations such as overcooking or overflowing of water.

• Journal of Broadcast Engineering
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• v.25 no.4
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• pp.487-496
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• 2020

For the purpose of next generation technology for robot perfomances, a RAoRA (Robot Actor on Robot Arm) structure was proposed using a robot arm joined with a humanoid robot actor. Mechanical analysis, machine design and fabrication were performed for motions combined with the robot arm and the humanoid robot actor. Kinematical analysis for 3D model, spline interpolation of positions, motion control algorithm and control devices were developed for movements of the robot actor. Preliminary visualization, simulation tools and integrated operation of consoles were constructed for the non-professionals to produce intuitive and safe contents. Air walk was applied to test the developed platform. The air walk is a natural walk close to a floor or slow ascension to the air. The RAoRA also executed a performance with 5 minute-running time. Finally, the proposed platform of robot performance presented intensive and live motions which was impossible in conventional robot performances.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.1
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• pp.187-192
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• 2020

It is very useful because we can measure precise exercise volume at indoor and outdoor space, and receive push message and retrieve for exercise information by smart-phone at any-time and any-place if a fitness healthcare system base on IoT is utilized. This system is interlocked with IoT module including sensing device in sports equipment, IoT gateway, smart-phone, smart-band and server by internet. In this paper, when this, "a fitness healthcare system base on IoT", software is developed, a proper analysis and design method for practical affairs try to be presented due to showing software development analysis method and design method such as flowchart and UI design.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.3
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• pp.1-6
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• 2004

Recently the examples of a designing a building-lighting to which LED, a solid state Lighting, is applied are increasing in number, but the development of lighting apparatus and the techniques applied to a designing lighting apparatus frequently don't fit to a new source of light. This essay refers to the matters relevant to the techniques for designing a lighting, which are controlled with a digital technology, and the effectiveness of a "Interactive-lighting technique" which has a ductility by a sensor with developing a digital source of light module and applying it to a real designing a building-lighting . In the negative aspect that a digital technology can standardize a space for a lighting, a "Interactive-lighting Technique", which detects an analogic change of nature through a sensor and produces it, can become a new alternative one.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.4
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• pp.873-892
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• 1998

In this paper, we propose an architecture of multimedia communication terminal that can e used in broadband ISDN environments. To design and implement the multimedia communication terminal, we analyzed the structure of multimedia terminals and the types of services which is recommended by public and private standard or ganization, such as ITU-T, Digital Audio-Visual Council(davic) and ATM Forum. The multifunctional communication terminal designed in this paper could allow inter-working between existing communication terminals on the heterogeneousnetwork and accept current and advanced multimedia communication application flexible. An implemented terminal is consisted of the multimedia processing board and the ATm interface board that is installed in PCI bus on personal computer. The integrated service multimedia communication terminal that is implemented supports retrieval, distributive and conversational communication service simultaneously. And then we performaned functional module test according to the individual communication services.

• Journal of the Korea Society of Computer and Information
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• v.15 no.8
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• pp.99-105
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• 2010

Because in the amusement park, a number of people use various vehicles facilities complicated arraigned, it needs an effective way to search optimal path to reduce errors in touring a park. Particularly, when choosing a facility, searching a waiting time-based path as well as shortest path is important. This paper presents a path recommendation system which minimizes total park tour time based on tour distance and waiting time through GPS and wireless internet. This system can also recommend customized tour path based on the characteristics of user members as well as a simple shortest path.

• Information and Communications Magazine
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• v.30 no.2
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• pp.18-28
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• 2013

본 논문에서는 M2M(Machine-to-Machine) 서비스의 확산과 산업 시장 활성화를 위해서 필수적으로 요구되는 M2M 단말에 대한 표준 플랫폼 기술과 연구개발 결과를 소개한다. 먼저 본 연구개발의 추진 배경 및 연구 내용과 M2M 단말 플랫폼의 표준화 필요성에 대해 살펴보고 현재 국내외적으로 진행되고 있는 M2M 기술 표준화 현황을 소개한다. M2M 서비스 계층과 M2M 통신모듈과 관련된 주요 표준화 기구의 작업 현황을 살펴보고, 이를 M2M 단말 표준 플랫폼 개발에 어떻게 적용하였는지를 설명한다. 이어서 국내외 표준화 추진 결과와 함께 연구개발의 결과로서 국내외 M2M 표준을 적용하여 개발된 M2M 통신모듈, 단말 관점에서 M2M 서비스를 지원하기 위한 미들웨어 플랫폼 SDK(Software Development Kit), M2M 단말 개발을 위한 통합 개발 환경을 제공하는 RDK(Reference Design Kit)의 세부내용을 소개한다. 또한, 개방되고 표준화 된 M2M 서비스를 위해 M2M 단말과 연동되는 M2M 서비스 플랫폼의 구조에 대해서도 간략히 살펴보며 이들이 실제 서비스에 적용 가능한 지를 검증하기 위해 구현된 M2M 서비스 사례에 대해서 소개한다. 마지막으로 본 연구개발 결과물의 활용방안과 여러 단말 개발업체들이 참여할 수 있는 M2M 테스트베드 구축 현황에 대해 살펴보고, 향후 M2M 서비스 활성화를 위해 나아갈 방향에 대해서 정리해 본다.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04a
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• pp.527-530
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• 2001

현재 인터넷의 killer application으로 VoIP 서비스를 들고 있으며 ITU-T H.323 기반의 VoIP 시스템은 검증된 기술로 인정받고 있다. 그럼에도 불구하고 대부분의 VoIP 관련기구에서는 차세대 VoIP용 호설정 프로토콜로서 IETF의 SIP를 채택하고 있다. 본 논문에서는 개발한 SIP 기반의 PC-to-PC 인터넷 전화 시스템에 대하여 기술한다. 구현 구성요소는 클라이언트와 서버로 구분된다. 클라이언트인 SIP UA(User Agent)는 MS Windows 98/2000에서 동작하며 Visual C++를 이용하여 구현하였다. 서버는 SIP Redirect Server와 사용자 등록을 위한 SIP Registrar를 Linux 환경에서 C++를 이용하여 구현하였다. SIP Registrar는 DB와 연동이 되며 MySQL 서버를 이용하였다.