• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.4-4
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• 2008

The progress in flat panel displays over the last two decades has been astonishing. In just 20 years, the LCD-TV grew up from a 2-inch curiosity, to an industry that will sell about 120 million flat panel TV's this year, with viewing area up to 4000 times larger. That success is based on continuous innovation, especially in manufacturing processes. For the next decade to bring another doubling of the business, progress will need to continue in four major areas: Human factors, ecological impact, visual quality, and of course continued drive towards affordability. This talk will detail the technology advances that can allow this industry to meet those challenges. Human factors. Today, we adapt our lifestyle to our technology. People organize their offices, and their homes, around displays. We pass around mobile phones to share images, rather than experiencing them as a group. Billions of newspapers continue to be sold daily. Advances in flexible displays can lead to large portable displays. "New era projection" includes the handheld Pico Projectors that are already on the market, and will ultimately appear integrated in mobile phones the same way cameras do today. "Eco" impact. Today TV's are one of the top energy consumers in a U.S. home, and the fastest growing. Watching a large flat panel TV can cost twice as much as running a large refrigerator. With today's concern about energy consumption, regulations are starting to emerge worldwide to limit TV electrical use. Fortunately, good solutions exist in using light management films to eliminate bulbs, saving power without increasing cost. Going forward, LED backlights will drive another step downward. OLED displays might be the ultimate solution. Visual quality. The color of an LCD-TV is still often considered inferior to a far less expensive CRT. And almost all displays suffer from representing a three-dimensional world on a two dimensional surface. The technology to improve color is available today, and will likely move from premium sets into the mainstream as costs come down. 3D is now arriving in movie theaters worldwide, and that will drive up the demand for similar realistic images in home theaters. And the technology is emerging today for 3D representation to move beyond specialized applications into everyday use, on screens large and small. Affordability. The world takes cost-down miracles for granted in consumer electronics. Each of these other advances will be balanced with a drive for affordability, especially as the market grows in emerging countries. The other three challenges must be met without increasing cost. Putting this all together, the next few years will emphasize "eco friendly" designs, and enhanced images such as 3D. By 2013 we will start to see serious penetration by emissive technologies (OLED, high efficiency plasma, or other), with the "ultimate display" likely not in the market for a decade. Lots of opportunities for innovation remain ahead of us.

• 전기학회논문지
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• 제59권2호
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• pp.338-343
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• 2010

Low cost motor drives are being sought for high volume energy efficient home appliances. Key to the realization of such low cost motor drives is to reduce the power electronic converter in terms of its components, particularly the active devices, finding the motor with least complexity for manufacturing and a controller that could extract the desired performance from the machine and converter combination. These and other factors such as self-starting, speed control over a wide range and most of all the crowning aspect of a four quadrant operation with bare minimum number of controllable switch (or switches) remain as formidable challenges for low cost motor drive realization. In this paper, a four quadrant switched reluctance motor (SRM) drive with only one controllable switch is realized by using a two-phase machine. The theory and operation of the proposed four-quadrant SRM drive with the proposed control algorithm for its realization are described. The motor drive is modeled, simulated and analyzed to verify its feasibility for self-starting, speed control and for four quadrant operation and the simulation results are presented. Experimental results confirm the validity of the proposed control algorithm for four quadrant control of the SRM drive. The focus of the paper is mainly directed toward the control algorithm for realizing the four-quadrant operation of the two-phase SRM drive with a single controllable switch converter.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제2권1호
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• pp.15-26
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• 2013

IP기반 무선 센서 네트워크(IP-WSN)는 의료, 주택 자동화, 환경 모니터링, 산업용 제어, 차량 텔레매틱스 및 농업 모니터링 등 광범위하게 적용되고 있다. 이러한 적용은 에너지 효율과 함께 센서의 이동성이 중요한 문제로 다루어진다. 에너지 비효율로 인해 네트워크 기반의 이동성관리 프로토콜은 IP-WSN에서 지원될 수 있다. 본 논문에서는 IP-WSN 프로토콜을 지원하는 멀티캐스팅 기반의 빠른 이동성관리 기법(mSFP)을 제안한다. 네트워크 구조와 시그널링 비용, 이동성 비용 등을 고려한 성능분석을 수행하였고[8,20], 분석 결과 PMIPv6와 SPMIPv6에 비하여 mSFP의 시그널링 비용, 전체 시그널링 비용, 이동성 비용이 모두 감소되었다. IP-WSN 노드의 수 측면에서 mSFP의 시그널링 비용은 7%, 전체 시그널링 비용은 3% 더 감소되었다. 홉의 수 측면에서 mSFP의 시그널링 비용은 6.9%, 전체 시그널링 비용은 2.5% 더 감소되었다. IP-WSN 노드의 수 측면에서 이동성 비용은 1.6%, 홉의 수 측면에서 이동성 비용은 1.5% 더 감소되었다.

• 신재생에너지
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• 제4권2호
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• pp.45-51
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• 2008

The fuel cell system is environment-friendly and energy efficient system. Especially, the fuel cell cogeneration systems providing heat and electricity to buildings have been developed and applied to a lot of sites in the world to cope with the global warming and $CO_2$ emission problem. This paper presents the result of study on the economic evaluation with super-micro fuel cell (SMFC) cogeneration system by varying the floor area ($132m^2{\sim}331m^2$) of the house, whose system capacity ranges from 0.10 kWe to 0.50 kWe. The electricity demand, heat demand, saved energy cost, and the simple pay-back period have been simulated for the various capacities of fuel cell cogeneration system. As a result, this study suggests the fuel cell system’s capacity decision strategy for a given house area. Contrary to conventional design assumptions, the smaller capacity fuel cell cogeneration system is appropriate for the house of large floor area to defense the progressive electricity tax, and the larger capacity fuel cell cogeneration system is appropriate for the house of small floor area to sell the electricity.

• KIEAE Journal
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• 제14권3호
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• pp.39-45
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• 2014

Energy poverty has been defined as low-income households who paid energy cost more than 10% of their ordinary income. Therefore, there are various subsidy programs focused on house remodeling for low-income households and one of them is the Home Energy Efficiency Assistance Program which have done by Korea Energy Foundation since 2007. The aim of the program is to improve the thermal performance of dilapidated dwellings and analyzed the detached house for the low-income households to develop the building typology. The database contained approximately 3,061 households which was obtained from the program in 2013 and the results of the study were like this; 1) For the shape of residential houses, the number of rectangular shaped building was higher than non-rectangular shaped ones. 2) For the orientation of buildings, the south layout of the detached housing was dominant to gain heating energy into buildings. 3) For the floor area, the average floor area was $44.2m^2$, although its size varied wide variations, which range from $6.3m^2$ to $107.1m^2$. 4) For the windows and doors, the south-facing window was larger than the other side. Finally it would be possible to determine the characteristics of residential houses for low-income families. A future study could establish typology of low-income housing that it would estimate the performance of each model building before and after the retrofit to improve the energy performance.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 춘계학술발표대회 논문집
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• pp.179-184
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• 2011

The development of new energy has attracted consideration attention due to the high oil price and environmental problems. In advanced country, they have tried to carry out a long range plan for energy. We need to develop new energy for Low Carbon Green Growth in Korea. The building is 30% among ratio of energy consumption in Korea. And in the past, heating energy was high ratio for energy using at home. But recently, the demand for cooling energy keeps growing due to rising average temperature on the earth and improvement of life quality. In this situation, the energy of lake water and ocean water has studied to utilize in advanced country because of low temperature at underwater. But the study for deep water is still a lot left to do. In this study, we analyzed district cooling system and the present condition. Analyzing the deep lake water cooling system in Toronto, we found an application of district cooling system using deep ocean water. Deep lake water uses heat source for district cooling and water source for city in Toronto. So reducing the initial cost, this city had economic effect. When DLWC was applied at existing building, the heat exchanger was installed instead of cooling tower and refrigerator. And the heat exchanger used to connect main pipe with cool water on city. System using deep ocean water can be applied as a similar way to supply cool water from lake to building.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
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• pp.25-28
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• 2008

The fuel cell system is environment-friendly and energy efficient system. Especially, the fuel cell cogeneration systems providing heat and electricity to buildings have been developed and applied to a lot of sites in the world to cope with the global warming and $CO_2$ emission problem. This paper presents the result of study on the economic evaluation with super-micro fuel cell (SMFC) cogeneration system by varying the floor area ($132m^2{\sim}331m^2$) of the house, whose system capacity ranges from 0.10 kWe to 0.50 kWe. The electricity demand, heat demand, saved energy cost, and the simple pay-back period have been simulated for the various capacities of fuel cell cogeneration system. As a result, this study suggests the fuel cell system's capacity decision strategy for a given house area. Contrary to conventional design assumptions, the smaller capacity fuel cell cogeneration system is appropriate for the house of large floor area to defense the progressive electricity tax, and the larger capacity fuel cell cogeneration system is appropriate for the house of small floor area to sell the electricity.

• 한국응용과학기술학회지
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• 제28권3호
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• pp.367-373
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• 2011

This research is a basic researching process for producing solid fuel that mixing paper sludge and Heat Transfer Medium Oil. Under the presence of Heat Transfer Medium Oil, paper sludge is heated and dried with home appliance microwave for comparing drying efficiency and energy efficiency of different types of drying method. As a result, Heat Transfer Medium Oil and paper mixing case of drying method, OMD, is the most efficient way to shorten the time for evaporating moisture in the paper sludge. In addition, heat transfer effect and density is increased with adding Heat Transfer Medium Oil by microwave. Future more, OMD's energy cost for evaporating whole moisture is 78% cheaper than MD. Also, OMD process shows the best energy efficiency with comparing other process. Evaporation rate of paper sludge evaporation process with microwave is 11.66% increased by adding Heat Transfer Medium Oil 150g. Preheating Heat Transfer Medium Oil or improving different ways injecting Heat Transfer Medium Oil is a good way to increase a rate of initiative moisture evaporation process.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.871-874
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• 2010

세계적으로 에너지원의 고갈, 기후 환경 변화, 전력수요 증가에 따라 인류 절대적 과제에 대한 결책으로 스마트 그리드에 대한 요구가 증대되고 있으며, 특히 분산형 전원에 대한 관심이 높아지고 있다. 이 추세에 다라 단위 규모의 분산형 전원의 형태로 댁내 분산형 전원 시대를 예고하고 있다. 하지만 현재 가장 보편적으로 사용하고 있는 신재생에너지원으로써 풍력, 태양광 에너지 발전의 경우 그 발전량이 자연의 변화에 매우 민감하기 때문에 전기품질의 균일성의 문제를 가지고 있다. 따라서 본 논문에서는 이를 해결하기 위해서는 기후 정보(meteorological sensor data)의 실시간 모니터링을 기반으로 하는 에너지 관리 방법을 제시하고자 한다. 현재 스마트그리드 분야에서 USN 기반의 킬러앱이 부재한 상황에서 무선 센서네트워크 기술을 활용한 기후 센서 데이터 수집 및 제어 방식을 적용한 댁내 분산 전력 관리 방법에 대해 제안한다. 이는 다른 통신방식에 비해 설치 비용 및 유지보수 차원에서 효율적이라고 판단한다. 즉, 전력 관리에 USN 기법을 융합한 EMS(Energy Management System) 모델을 제시함으로써 기후 데이터 모니터링 및 분석, 이에 따른 발전량 예측, 신재생에너지와 기존 전력의 효율적인 분배 제어 방법을 구체화함으로써 궁극적으로 제로에너지 홈을 구현하기 위한 기반을 마련하는 것이 본 논문의 목표이다.

• 대한교통학회지
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• 제24권6호
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• pp.65-74
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• 2006

승용차이용이 많이 유발될 수밖에 없는 지역으로의 주거이동은 쉽게 간과되는 가구의 교통비 지출에도 원인이 있다. 가구의 자동차수요를 적게 일으키고 교통비를 절감시키는 주거입지와 구조를 알아보기 위해서는 주거지역의 공급시설수준에 따른 가구의 교통수용행태를 분석하고 이러한 자료를 기반으로 실제에 가까운 가구의 교통비용을 산정할 필요가 있다. 본 연구는 대중교통시설을 비롯한 근린시설들에 대한 접근도가 가구의 교통이용행태와 더불어 교통비 지출에 미치는 영향을 분석하는데 목적이 있다. 연구지역은 광역 함부르크 시이고 1,640가구들을 통행행태에 대한 설문조사가 실시되었다. 개인의 대중교통이용과 교통거리는 대중교통 공급시설만으로는 큰 영향을 받지 못하고 근린시설공급이 뒷받침 되어야 한다는 사실이 분석결과에서 나타났다. 또한 대중교통시설 및 근린시설이 부족한 지역일수록 여기에 있는 가구들의 승용차 보유수와 교통거리가 증가되었으며 이에 따라 결국 가구들의 교통비용이 늘어났다. 가구그룹들에서 교통비의 최고치와 최저치 사이에 가구당 월 약 200유로 차이가 났다. 가구가 쉽게 감지하기 어려운 주거입지별 평균 교통비용이 가시화되어 가구들에게 홍보된다면 가구의 주거이동행태를 교통수요가 적은 지역으로 유도하는데 기여할 수 있다.