• The Inventors News
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• no.12
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• pp.7-7
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• 2003

덴함의 `자동판매기` - 분리$\cdot$결합이 가능한 멀티탭

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.346-348
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• 2020

IoT 시장이 날로 성장하는 요즘 원룸 촌이나 회사, 학교 등의 기숙사에서 사용되고 있는 공용 세탁기의 여러 불편한 문제점을 해결하기 위한 방안이 필요하다. 기존의 기기를 교체할 필요 없이 멀티 탭 하나로 누구나 쉽게 설치 가능하고, 누구나 쉽게 확인할 수 있는 시스템을 구축함으로써, 공용세탁기 사용자들의 불편함을 개선하도록 돕는다.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1755_1756
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• 2009

본 논문에서는 전기전자 기기가 외부전원에 연결된 상태에서 그 주 기능을 수행하지 않거나 내부 혹은 외부로 부터 주 기능 수행을 위한 명령을 기다리고 있는 상태에서 소모하는 대기전력(Standby Power)을 저감할 수 있는 장치를 개발하고자 하였다. 기존의 멀티탭 형대기전력 차단장치는 그 장치 자체의 소비전력이 커서 사용 의미를 퇴색시키는 문제점을 안고 있다. 본 논문에서는 기존 제품의 이러한 문제점을 보완시키고 대기전력을 획기적으로 감시킬 수 있는 멀티탭 형식의 외장형 대기전력 차단장치와 가전기기 내장형 차단장치의 회로를 설계 및 구현하고 비교 실험을 통하여 그 우수성을 확인하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2018.05a
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• pp.575-577
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• 2018

'대기전력(standby power)'이란 전원을 끈 상태에서 전기제품이 소비하는 전력이다. 한국전기연구원의 2011년 전국 대기전력 실측조사에 따르면 일반 가정의 경우 보통 전체 전기 사용량의 6% 이상이 대기전력으로 버려지고 있으며, 한해 약 4천2백억 원이 낭비되는 셈이라고 발표하였다. 이에 따라 본 논문에서는 'Fitbit'를 이용하여 수면 패턴을 파악하고, 사용자가 잠자는 사이에 사용하지 않는 기기의 전원을 차단할 수 있는 수면 분석 기반 스마트 멀티탭을 제안한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.9
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• pp.745-752
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• 2016

In the era of the Internet of Things, where all physical objects are connected to the Internet, we suggest a remote control system using a Raspberry Pi single-board computer with ZigBee, which can turn an indoor light-emitting diode (LED) and a multiple-tap on and off, and with a smart phone can control the brightness of the LED as well as an electronic door lock. By connecting an infrared (IR) transmitter module to the Raspberry Pi, we can control home appliances, such as an air conditioner, and we can also monitor indoor images, indoor temperatures, and illumination by using a smart phone app. We developed a method of finding out IR transmission codes required for remote-controllable appliances with an AVR micro-controller. We suggest a method to remotely open and shut an office door by novating the door lock. The brightness level of an LED (between 0 and 10) can be controlled through a PWM signal generated by an ATmega88 microcontroller. A mutiple-tap is controlled using an ATmega32, a photo-coupler, and a TRIAC. The signals for measured temperature and illumination are converted from analog to digital by using the ATtiny44A microcontroller transmitting to a Raspberry Pi through SPI communication. Then, we connect a camera to the CSI head of the Raspberry Pi. We can turn on the smart multiple-tap for a certain period of time, or we can schedule the multi-tap to turn on at a specific time. To reduce standby power, people usually pull out a power code from multiple-taps or turn off a switch. Our method helps people do the same thing with a smart phone, if they are away from home.

• The KIPS Transactions:PartC
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• v.13C no.7 s.110
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• pp.881-888
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• 2006

The position of the bridged tap is determined by that of the outlet in most modern apartments, since most of the indoor wiring utilizes the bus wiring structure when deploying the indoor communication line. These bridged taps deteriorate transmission performance in the specific frequency at the time of high-speed multimedia communication, which uses a high frequency bandwidth, since the duality of return loss worsens and line attenuation increases rapidly. As a result, analysis on this phenomenon is required. In this study, the test model is created by modeling the intercommunication facility of the apartment that is the most representative residential house type, and by understanding the structure and the environment of the indoor wiring. Also, how the bridge tap affects performance is analyzed when the VDSL service is provided, so that problems of intercommunication lines can be identified and methods for improving the proper intercommunication line can be suggested, which is suitable for accommodating high-speed multimedia service of the future.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.05a
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• pp.978-980
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• 2013

In this paper, we have presented a basic idea of a power shut-off client based on NFC (near field communication). For the first step of the system design, we have shown the conceptual diagrams of the hardware configuration and the software logic flow. This system can be applied to the integrated power control in home, office, school, factory, and apartment. The standby power shut-off system will bring saving in electrical energy and cost.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.29 no.5 s.236
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• pp.561-567
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• 2005

The effect of triangular multi-tabs attached at the perimeter of jet nozzle on flow structure in the near field was investigated experimentally. A stereoscopic PIV(SPIV) system was employed to measure three orthogonal velocity components of the 3-D turbulent jet. In this study, two different types of sharp-edged jet nozzle having 4, 8 tabs were tested at the Reynolds number of Re=10,000. SPIV measurements were carried out at 5 cross-sectional planes. Six hundred instantaneous velocity fields were measured for each experimental condition and they were ensemble averaged to get spatial distributions of turbulent statistics such as mean velocity and turbulence intensity. Entrainment rate of surrounding fluid into the tabbed jets was estimated using the measured 3-D velocity field data. The strong vortex structure was induced for the jet flow with 4 tabs, increasing entrainment rate.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.20 no.8
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• pp.701-713
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• 2009

This paper studies a method for reducing performance degradation due to losing sub-carrier orthogonality caused by power transient between physical channels in LTE uplink transmission. The pattern of inter-carrier interference(ICI) caused by power transient is different from what has been studied for doppler shift, in that its pattern occurs at front and rear sides of channels in each period of power transient. The reason of ICI's occurrence results from power difference between channels, power transient duration, multi-path channel delay spread, and numbers of sub-carrier. New criterion is proposed to find out number of taps of multi-tap equalizer enough to improve the ICI. The scheme is to determine the number of taps of multi-tap equalizer when a normalized interference or a normalized ICI is greater than a normalized noise. Simulation results show that the number of taps is flexibly adjusted according to SNR(Signal to Noise Ratio) of a received signal to improve Bit Error Rate(BER), while the complexity of the proposed scheme is reduced down to 88 percentage of the classical method.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.10
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• pp.2343-2350
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• 2010

In this paper, new smart switch that can monitor and control the power consumption and standby power in real-time by implementing an embedded web-server is proposed. The proposed switch can perform the following functions: measuring the electric power like commercial smart meter product, monitoring the power consumption in real-time in distant places through wire and wireless devices, and finally controlling ON/OFF of each switch. In addition, it also contains auto power-shutoff functions for standy power, overvoltage and overcurrent just like existing power-saving outlet and mulitap. Finally, the proposed smart switch has lower hardware and power consumption than the existing products and can be commercialized as a small-sized product by using exclusive embedded web-server of its own, rather than using PC for monitoring and remote control.