• Annual Conference of KIPS
• /
• 2021.11a
• /
• pp.156-159
• /
• 2021

최근 발표된 정책으로 공공시설과 민간건물의 제로에너지 전환이 진행되고 있다. 본 논문에서는 제로에너지 기술인 패시브 기술에 사물인터넷을 적용하여 스마트 주택에 쾌적한 내부 환경 조성과 효율적인 에너지 운영을 도울 수 있는 패시브하우스 아키텍처를 제안한다. 패시브하우스의 모의 구현을 통하여 관리 시스템 운영에 필요한 기술을 제안하며, 패시브하우스의 모니터링 시스템을 제안하므로 사용자에게 편의성을 제공한다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2010.11a
• /
• pp.51-52
• /
• 2010

최근 방송용 모니터링 스피커 시스템은 디지털 방송 기술과 반도체 기술의 급속한 발전에 힘입어 보다 질 좋은 오디오 앰프를 싼 가격과 소형화 기술을 적용하여 앰프와 스피커 매칭의 문제점을 안고 있는 패시브 크로스오버 사용의 멀티웨이 스피커를 대체하여 액티브 크로스 오버를 사용한 멀티 앰핑의 액티브 스피커로 진화 하고 있다. 방송 스튜디오에서 많이 사용되고 있는 2웨이 액티브 스피커를 모델로 국악콘텐츠 모니터링에 최적화된 액티브 모니터링 스피커 구현을 위한 크로스오버 회로를 설계하고 전자회로 시뮬레이션 프로그램인 Pspice를 이용하여 최적의 국악콘텐츠에 적용하기위한 크로스오버 주파수구현을 위한 소자 값들을 찾아내어 실제 제작회로에 적용 시 경비 절감과 개발시간을 단축 한다.

• KIEAE Journal
• /
• v.13 no.2
• /
• pp.39-46
• /
• 2013

Recently, the field of construction is putting a variety of effort into reducing CO2, since global warming is being accelerated due to climate changes and the increase of greenhouse gas. For reduction of CO2 in the field of construction, it is required to make plans to cut down heating energy of buildings and especially, it is urgently needed to cut down energy of residential buildings in rural area where occupies the majority of consumption of petroleum-based energy sources. Therefore, this research compared and analyzed the actual energy consumption, by evaluating energy performance of a detached house applying passive house design components for reduction of energy. As the result, energy consumption showed remarkable differences, according to the operation of a heat recovery ventilation unit which is one of passive house design components, and building energy consumption displayed remarkable differences, too, depending on the difference of airtightness performance during building energy simulation conducted in process of design. Based on these results, the importance of airtightness performance of passive house was verified. The result of the actual measurement of energy consumption demonstrated that LNG was most economical amongst several heat resources yielded, on the basis of LPG source energy consumption measured within a certain period of time, and it was followed by kerosene. LPG was analyzed to have a low economic efficiency, when used for heating.

• Journal of the Institute of Convergence Signal Processing
• /
• v.19 no.3
• /
• pp.89-96
• /
• 2018

This study aims to develop a fully passive smart sensing tag utilizing RF (Radio Frequency) energy harvesting technology at UHF (Ultra High Frequency) band of 915MHz. To optimize the power collected under various radiated conditions, an efficient energy harvesting module exploiting a boost circuit with maximum power point tracking (MPPT) is employed. Specifically, the proposed tag features two orthogonal antennas to enhance its capability of both energy scavenging and data transmissions. The experimental result shows that the developed smart sensor tag can scavenge an RF input power of as low as 0.19mW at a distance of 4 meters for a 3.6Vdc output. Furthermore, the proposed smart sensor tag performs the feasibility of completely autonomous monitoring food freshness at 2 meters with a low-power sensor array.

• Journal of the Korean Solar Energy Society
• /
• v.35 no.2
• /
• pp.85-91
• /
• 2015

In this study, energy performance analysis of houses in zero energy demonstration town(ZeT) was carried out using the monitoring results. This ZeT was composed 29 zero energy individual houses(ZeH) which were applied passive as well as active technologies. The results are as follows. (1) Residents are generally considered to have been lacking basic mind to save energy, (2) In particular, average yearly total energy consumption per house is 12,834 kWh and specific heating energy is $53.2kWh/m^2{\cdot}yr$ which is higher than that of passive house. This is because of one of the reason just pointed out in subsection (1). (3) Most part of the residual energy load are supplied with only renewable energy, but not operating energy for geothermal heat pump which is use of cheap electricity.

• Journal of Conservation Science
• /
• v.33 no.5
• /
• pp.319-329
• /
• 2017

In this study, formaldehyde concentrations in two exhibition halls were monitored using a passive sampler from May 2012 to April 2013. Formaldehyde concentrations in the exhibition halls were 5 to 36 times higher than concentrations outdoors. Concentrations inside the exhibition room and showcase varied according to pollutant source, HVAC(heating, ventilation, air conditioning)system and environment management. The formaldehyde concentration levels were corrected according to a standard method prescribed by Indoor Air Quality Management Law of the Ministry of Environment, Korea. As a result, Most concentration levels exceeded the exhibition standard of the Ministry of Environment($100{\mu}g/m^3$) and artifacts conservation standard of Tokyo National Museum($50{\mu}g/m^3$). Seasonal concentrations in the exhibition room and showcase were in the order summer>fall>spring>winter. Formaldehyde emissions increased in summer when air temperature and relative humidity are both high. Formaldehyde concentration distribution according to the temperature and relative humidity showed positive correlation. Air temperature showed good correlation because $R^2$ was in the range of 0.8~0.9. Analysis of formaldehyde emission characteristics in the exhibition hall would be helpful in efforts to improve indoor air quality.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.37 no.5B
• /
• pp.348-356
• /
• 2012

The application traffic analysis is getting more and more challenging due to the huge amount of traffic from high-speed network link and variety of applications running on wired and wireless Internet devices. Multi-level combination of various analysis methods is desired to achieve high completeness and accuracy of analysis results for a real-time analysis system, while requires much of processing burden on the contrary. This paper proposes a novel architecture for a real-time traffic analysis system which improves the processing performance on multi-core CPU environment. The main contribution of the proposed architecture is an efficient parallel processing mechanism with multiple threads of various analysis methods. The feasibility of the proposed architecture was proved by implementing and deploying it on our campus network.