• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.5
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• pp.344-354
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• 2013

In this paper, In order to solve the traffic of the SNS to be executed on smartphone, we propose the design of the SNS integrated gateway server. Also, we capture the payload size in a variety of methods to send the MQTT protocol and QoS level of MQTT protocol for communication between the client and the Gateway. And we present the results and analysis of packet loss and end-to-end delay. By using analysis proposed, we present the results of the integrated SNS Gateway push notification protocol design.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.9 no.2
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• pp.237-242
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• 2016

To build effective u-healthcare system based-on smart-cloth, design of hardware and software modules for suitable smart-cloth is needed. And a gateway smart-phone program for sensing signal's collecting and processing is needed to send sensing bio-signal from smart-cloth to sever. To do this, it is an important to design and describe modules well for having no difficult problems when implementing later. Also, if medical team do not monitor bio-signals sending from smart-phone frequently and these signals' change values which diagnose automatically due to building expert system based on rules/facts is informed for users, it will be an useful u-healthcare system. Therefore in this paper, by presenting design method of u-healthcare system hardware and software modules based on smart-cloth which prepared these functions, this design method is showed for applying a common use u-healthcare system's production usefully.

• The Journal of the Korea institute of electronic communication sciences
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• v.10 no.7
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• pp.787-792
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• 2015

In this paper, We described the implementation of the Smart Gateway for heterogeneous interface integrated, Web Server and Building Energy Management System(: BEMS). The proposed system introduces the reduction of peak power and electric power usage with service model and operating algorithm for energy saving in building.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.779-780
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• 2016

해당 개발 연구기기는 스마트그리드와 같은 에너지 IoT에 적용할 수 있는 다중통신기반 게이트웨이로 정보를 수집하는 무선 구간과 이를 상위 서버로 전달하는 무선 또는 유선 구간을 복합적으로 적용한 장치이다. 에너지를 효율적으로 관리하는 시스템 구축에 있어 여러 정보를 수집하고 상위 관리 서버로 전달하는 중요 역할을 담당한다. 현재는 연구단계로 정보 수집 및 전달은 시험을 완료하였으며, 성능 개선을 진행 중에 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06d
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• pp.412-415
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• 2010

첨단 주택에서 가전기기의 에너지 소모량을 모니터링하기 위하여 센서 네트워크를 이용한 스마트 플러그를 제안한다. 제안한 시스템은 전기 콘센트 형태로, 매 초마다 홀센서를 지나가는 전류량을 측정하여 센서 네트워크를 통해 홈 게이트웨이에 전송한다. 홈 게이트웨이는 전송된 데이터를 전력량으로 변환하여 저장하고, 모니터링 프로그램을 통해 전력량을 표시한다. 실험 결과 제안한 시스템은 에너지 소모와 사용을 관리함에 있어서 우수한 성능을 확인하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.855-858
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• 2015

최근 IoT에 대한 관심이 증가되면서 IoT 환경에서 다양한 서비스가 개발되고 있다. IoT를 통해 사물에 센서 혹은 액츄에이터 등 다양한 IT기술을 적용하여 사람과 사물, 공간이 통신을 하게 된다. IoT는 다양한 산업 분야에 적용되고 있으며 우리 생활과 밀접한 영역인 스마트 홈 분야에서도 시장 활성화가 진행되고 있다. 하지만 스마트 홈 환경에서는 인증되지 않은 사용자와 스마트 디바이스를 통한 해킹 및 악성코드 감염 등 다양한 보안 위협이 발생하게 된다. 이를 해결하기 위해 본 논문에서는 IoT 환경에 적합하도록 효율적이며 사용자, 스마트 홈을 연결하는 홈 게이트웨이, 스마트 홈 내의 스마트 디바이스 간 상호 인증을 제공하는 안전하고 효율적인 상호 인증 기법을 제안한다.

• Journal of the Korean Institute of Intelligent Systems
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• v.25 no.4
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• pp.334-341
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• 2015

This paper develops a new system for remotely monitoring and controlling the windows and doors in mobile environment. We design and implement the opening and shutting unit, the gateway, and the control server system, respectively. The opening and shutting unit consists of the driver using DC motor and the motion controller which monitors the state and transfers the control information. The gateway supports TCP/IP and CDMA protocol, which is the interface of wire and wireless communication for transferring the current state and control information. The control server consists of the program to store and process the control information, the middleware to support the processing of various state message, and DB for monitoring the state and remotely controlling the system. Especially, an application software and the Web-based user interface have also been developed to support the mobile environment. The operation performances, environment influences, driving persistences, and operation failure ratio, which are based on PC and smart-phone, have been tested in 2 authorized agencies. The test results show that the developed system has a superior performance.

• Journal of the Institute of Electronics and Information Engineers
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• v.54 no.3
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• pp.39-51
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• 2017

Recently, looking at construction sites with either large or small scale, accidents like collision, fall, etc. occur often. These accidents lead to not only damage of human lives but also serious economic loss. In case of large scale constructions sites, safety management systems are used to reduce industrial accidents. However in construction sites with small scale, those systems cannot be applied due to problems such as lack of compatability and high installation expense. In this case, just by putting on safety gears can also reduce industrial accidents. Therefore, in this paper, a safety management systems that can be used at both large and small scale construction sites is proposed. This safety management system consists of a smart module, a repeater and a gateway, and a monitoring system. The smart module, which is detachable, is attached to a safety helmet. This module transfers the current status of the user to the monitoring system through the repeater and the gateway. The repeater transfers the data received from the smart module to the gateway, and the gateway sends the data from the repeater to the monitoring system. The monitoring system shows the user status to the safety supervisor by displaying the data - temperature, height, intensity of illumination, images - received from the smart module. The safety supervisor can monitor the user status in real-time and take immediate action in case of emergency through this monitoring system.

• Smart Media Journal
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• v.8 no.4
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• pp.9-16
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• 2019

In order to realize IoT(Internet of Things) service, it is necessary to manage sensing data and build a service with respect to its scalability. However, existing internet services use unique protocols and non-standardized functions for each service provider, and it is difficult to provide data management and service because they use short-range communication technology such as Bluetooth. In addition, plurality of APs and gateways must be taken into consideration in establishing a wide area network. In this paper, we propose a sensing data management system using LoRa(Long Range) communication based on Mobius platform. The end device that drives Tas is configured to collect sensing data, configure an application gateway that drives &Cube, and transmit sensing data to the server. In addition, a server that manages the Mobius is configured to handle the sensing data transmitted from the application gateway to provide a monitoring service. We establish a wide area network through LoRa communication between the end device and the gateway and provide data management and service corresponding to the internet through the Mobius platform.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.786-791
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• 2021

In this paper, in order to minimize limitations such as signal interference and positioning errors in existing indoor positioning systems, a smart LED-based positioning system for excellent line-of-sight radio environments and precise location tracking is proposed to improve accuracy. An IEEE 802.4 Zigbee module is mounted on the SMPS board of a smart LED; RSSI and LQI signals are received from a moving tag, and the system is configured to transmit the measured data to the positioning server through a gateway. For the experiment, the necessary hardware, such as the gateway and the smart LED module, were separately designed, and the experiment was conducted after configuring the system in an external field office. The positioning error was within 70cm as a result of performing complex calculations in the positioning server after transmitting a vector value of the moving object obtained from the direction sensor, together with a signal from the moving object received by the smart LED. The result is a significantly improved positioning error, compared to an existing short-range wireless communications-based system, and shows the level at which commercial products can be implemented.