• Journal of Industrial Technology
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• v.30 no.A
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• pp.9-15
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• 2010

Recently, Smart Grid is a emerging topic in power and communication industry. Smart Grid refers to a evolution of the electricity supply infrastructure that monitors, protects, and intelligently optimize the operation of the interconnected elements including various type of generators, power grid, building/home automation system and end-use consumers. In order to successful implementation of Smart Grid, energy management function will be the key factor that coordinates and optimally controls the various loads according to the operating condition and environments, and the load patterns in residential and commercial building will be required as fundamental element for load management. In this study, we collects many types of energy usage data of electric appliances, analyze their load curves, and make the general load patterns for electrical appliance.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.171-174
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• 2000

본 논문에서는 홈 오토메이션 시스템을 음성인식을 도입하여 설계하였다. 많은 계산량과 방대한 양의 데이터의 처리를 요구하는 음성인식을 DSP(Digital Signal Processor)를 통하여 구현해 보고자 본 연구를 수행하였다. 이를 위해 실시간 끝점검출기를 이용하여 추가의 입력장치가 필요하지 않도록 시스템을 구성하였다. 특징벡터로는 LPC로부터 유도한 10차의 cepstrum과 log 스케일 에너지를 이용하였고, 음소수에 따라 상태의 수를 다르게 구성한 DHMM(Discrete Hidden Marcov Model)을 인식기로 사용하였다. 인식단어는 가정 자동화를 위하여 많이 쓰일 수 있는 10개의 단어를 선택하여 화자 독립으로 인식을 수행하였다. 또한 단어가 인식이 되면 인식된 단어에 대해서 현재의 상태를 음성으로 알려주고 이에 대해 자동으로 실행하도록 시스템을 구성하였다.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.4
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• pp.467-473
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• 1999

We have realized the two kinds of power line communication systems by the FSK MODEM. The first approach is the DS-SS (Direct suquence-spread spectrum) technique using 8 bits pseudo noise, the other is Convolutional coding method by the new algorithm. Their characteristics are comparied with each other by experimenting their Bit Error Rates (BER) in high level of Noise. The results have showed that two systems are useful to the application of HA (Home Automation) systems.

• Proceedings of the Korean Information Science Society Conference
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• 2010.06b
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• pp.157-161
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• 2010

최근 자동화 시스템의 연구가 활발히 진행되고 있다. 그중에서도 홈오토메이션의 가장큰 특징은 전자 자동기기 등이 주가 되는 가사의 관리를 자동화 하는 것이다. 사용자의 현재 상황 및 선호도 등의 정보를 이용하여 서비스를 사용자에게 제공하는 개인화 서비스는 사용자 프로파일에 따라 차별화 되어서 제공되어 진다. 하지만 현실상의 사용자 프로파일을 수집하기에는 어려움이 따르기 때문에 본 논문에서는 개인화 서비스를 효과적으로 지원할 수 있도록 가상의 사용자 프로파일을 다루는 사용자 프로파일 생성기 데이터베이스를 설계 및 사용자프로파일 생성기를 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.1051-1054
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• 2021

본 시스템은 홈 CCTV 를 이용해 집 안 사용자의 감정인식, 행동인식을 통해 스마트홈 자동화할 수 있는 시스템으로, 인식된 감정에 맞춰 음악 재생, 조명 조절을 하거나 간단한 동작만으로 IoT 단말을 컨트롤 한다. 또한 실시간으로 IoT 장비들이 동작할 수 있도록 마이크로 서비스 아키텍처로 감정인식과 행동인식 서비스를 설계하여 구현하는 것이 특징이다. 이는 스마트홈 내에서 더 편리하고 가치 있는 집안 환경을 구현할 수 시스템을 제공한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.3
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• pp.624-629
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• 2018

The current study was conducted to develop a portable composite gas detector allowing the detection of both $CO_2$ and $CH_4$ gases by means of the Non Dispersive Infra-Red (NDIR) method. The gas detector is configured to radiate infrared waves using infrared lamps, where the wavelength of the infrared light is reduced due to absorption throughout the chamber, and this reduction (absorption) is detected by the absorption detector, before being converted and amplified to a 3.5V~6V electrical signal, providing as accurate a measurement as possible. The conventional singe sensor method measures the relative measurement by absorbing only specified wavelengths of infrared radiation, which in the case of gas detection leads to problems with accuracy due to the lack of a reference sensor when detecting light with a wavelength of only $4.26{\mu}m$. The dual sensor employed in this study provides a comparative measurement between the reference value derived from the wavelength of $3.91{\mu}m$, which is not influenced by other gas sources, and the measurement value derived from the wavelength of $4.26{\mu}m$, in order to reduce the errors and enhance the reliability, thereby allowing low power consumption for portable devices and multi-gas detection for both $CO_2$ and $CH_4$ gases. The portable composite gas detector developed herein provides a measurement rage of 0ppm~5,000ppm for $CO_2$ gas, and 0.5%vol for $CH_4$, which allows the determination of whether the $CO_2$ and $CH_4$ contents in indoor air are less than 1,000ppm or not. The current study established that the composite gas detector can be interlinked with firefighting appliances through portable devices or home automation, and is anticipated to be very effective in fire prevention.

• Management & Information Systems Review
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• v.32 no.3
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• pp.247-261
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• 2013

Recently, the smart phone, a carrying along terminal connection technology such as Galaxytap/iPad etc. evolves, and supply is increasing rapidly, is included for smart phone because various sensor technologies are developed and service application that is acted in terminal with this is accompanied and grow. Continuously 4 generation to 3 Gs, Wibro Wireless network technology of communications a LTE technology from that is constructed, environment for Ubiquitous realization is being constructed fast. Therefore, in this paper it can inquire state of electronic, furniture devices through apartment complex web server and gear that control groove network at smart phone, and control, and confirms home state prevention of crimes state, and video inquiry of position that CCTV is placed in apartment complex was available. And it proposed integrated smart apartment with parking system and medical system using RFID system in ubiquitous environment.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.11
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• pp.2119-2124
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• 2016

The Internet of things (IoT) needs to be an event-driven approach for efficient related time response and processing. The growth of mobile devices in Internet of Things (IoT) leads to a number of intelligent buildings related IoT applications. For instance, home automation controlling system uses client system such web apps on smartphone or web service to access the home server by sending control commands. The gateway based RESTful technology responsible for handling clients'requests attests an internet latency in case a large number of clients' requests submit toward the gateway increases. In this paper, we propose the design tasks of the IoT gateway for handling concurrency events. The gateway based event-driven architecture is designed for building IoT gateway using node.js on one side and communication protocol based message-oriented middleware known as XMPP to handle communications of intelligent building control devices connected to the gateway through a centralized hub.

• International Journal of Control, Automation, and Systems
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• v.4 no.6
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• pp.763-768
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• 2006

The two-for-one(TFO) twister is precision machinery that twists fibers rapidly under constant tension. Since the quality of the twisted yarn is directly deteriorated by faults of the twister, such as the distortion of the spinning axis, bearing abrasion, and tension irregularity, it is important to detect faults of the TFO twister at an early stage. In this research, a new algorithm is proposed to detect faults of the TFO twister and their causes, by measuring the vibrations of the TFO twister and obtaining frequency components with a FFT algorithm. The TFO twister with faults showed increased vibrations and each fault generated vibrations at different frequencies. By analyzing changes of characteristics of vibrations, we can determine faulty twisters. The proposed fault detection algorithm can be implemented cheaply with a signal processor chip. It can be used to find when to repair a faulty TFO twister without much loss of yam on-line.

• Journal of the Korean Society of Industry Convergence
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• v.20 no.4
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• pp.275-284
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• 2017

As the high-level of the industrial and information age, the electricity become the indispensable element in the daily life including OA, FA, and computer, electric home appliances, and etc. In particular, The continuous use of the high capacity power supply system by applying a Switching Mode Power Supply(SMPS) according to the increase of the secondary side output terminal of the power load of the refrigerator of the home appliance or automation of the plant is pressed. The purpose using the way with this kind of high-capacity altogether is to supply the output voltage and output current regardless of the input voltage or to the external environmental conditions of the secondary-side load fluctuation. In this paper, a combination of a Buck Converter with Boost Converter by making a constant current source to control the inductor current and maintain stable power supply side operating characteristics, when load variations. While maintaining the same characteristics as conventional Buck Converter, and offer a DC-DC Converter system with the new switch pattern having a wide output range capable of operating in Buck-Boost Converter. In addition, after theoretical analysis, we carry out simulations and experiments to verify the validity and performance comparing with a conventional DC-to-DC converter.