• Journal of the Korean Wood Science and Technology
• /
• 제34권2호
• /
• pp.37-45
• /
• 2006

The viscoelastic properties of blends of melamine-formaldehyde (MF) resin and poly(vinyl acetate) (PVAc) for engineered flooring used on the Korean traditional ONDOL house floor heating system were investigated by dynamic mechanical thermal analysis (DMTA). Because MF resin is a thermosetting adhesive, the effect of MF rein was shown across all thermal behaviors. The addition of PVAc reduced the curing temperature. The DMTA thermogram of MF resin showed that the storage modulus (E') increased as the temperature was further increased as a result of the cross-linking induced by the curing reaction of the resin. The storage modulus (E') of MF resin increased both as a function of increasing temperature and with increasing heating rate. From isothermal DMTA results, peak $T_{tan{\delta}}$ values, maximum value of loss modulus (E") and the rigidities (${\Delta}E$) of MF/PVAc blends at room temperature as a function of open time, peak $T_{tan{\delta}}$ and maximum loss modulus (E") values were found to increase with blend MF content. Moreover, the rigidities of the 70:30 and 50:50 MF/PVAc blends were higher than those of the other blends, especially of 100% PVAc or MF. We concluded that blends the MF/PVAc blend ratios correlate during the adhesion process.

• 농촌의학ㆍ지역보건
• /
• 제13권1호
• /
• pp.104-107
• /
• 1988

최근에 한국에서 비닐 하우스에서 일하는 농부가 증가하며, 거기에 비례하여 많은 질병을 호소하고 있다. 그래서 저자는 비닐 하우스에서 일하는 150명의 농부에 대하여 임상 역학적 연구를 실시하였다. 그 결과는 다음과 같다. 1) "비닐 하우스"내에는 작업시간은 대부분의 농민이 1회에 2-4시간이며 1일 2회 이상 출입하고 있다. 2) "비닐 하우스" 내부의 온도는 섭씨 $32^{\circ}$이상이며, 습도는 90%이상이었다. 3) "비닐 하우스"의 크기는 높이가 180cm이며, 넓이가 400cm인 반원형이다. 4) "하우스"내부에서의 농약 살포는 월 1회(7%), 2회(13%), 3회(27%), 4회 (30%), 그이상(15%)였다. 5) 농약 살포시 "마스크"를 착용하지 않는 농민이 71%이며, 농약을 살포한 후 1시간이내에 "비닐 하우스"내에 후입하는 농민은 39% 였다. 6) "하우스" 재배 농민들이 호소하는 주요 증상은 발한(98%), 요통(92%), 현기증(86%), 두통(83%), 근육통(81%), 호흡곤란(78%), 구토(44%)이며, 이러한 증상들은 "비닐 하우스"내에서 작업하신 시간에 비례하여 증가하였다. 7) 이러한 증상들에 대한 농민들의 처지방법은 집에서 휴식 및 안정을 취한다. 약을 사먹는다(34%), 계속 작업을 한다(27%), 의사를 찾아간다(1%) 이었다. 이상과 같은 결과로 볼때 "비닐 하우스"병의 주요원인은 "비닐 하우스" 내부가 고온, 다습한 환경이며, 비닐 하우스 "내부에서 농약 살포와 협소한 작업환경 때문이라는 것을 알게 되었다.

• 한국초지조사료학회지
• /
• 제18권3호
• /
• pp.187-194
• /
• 1998

This study was conducted to investigate the effect of antagonistic bacteria and pathogenic fungi on growth and yields of white clover(Trifo1iurn repens L.) in continuous cropping soil(CCS) and non-continuous cropping soil(NCCS). The gowth experiment of white clover was conducted at pots in a vinyl house. White clover was established by seeding into pots of 12 cm in diameter and 9 cm in depth containing 1:l mixture of soil and vermiculite with antagonistic bacteria and pathogenic fungi. In dark culture experiment, white clover lived longer in treatment of antagonistic bacteria than in treatment of control, but lived shorter in CCS than in NCCS. Dry weight of white clover was increased by the inoculation of the antagonistic bacteria(p< 0.05), but decreased by the inoculation of the pathogenic fungi(p< 0.05) both CCS and NCCS. In conclusion, bacterization of white clover with antagonistic bacteria enhances the growth and yield of white clover.

• 한국농촌건축학회논문집
• /
• 제14권4호
• /
• pp.117-124
• /
• 2012

The purpose of this study is the impact of the typhoon damage to housing and facilities in rural areas. House of damage, as well as the only including damage of facilities in rural areas, particularly greenhouse(Glass greenhouse, Plastic greenhouse, Vinyl greenhouse) leads to damage of crops the scale of the damage increases. In this study, focused on Jeollabuk-do area, accompanying him, the number of gale damage and evaluate the extent of the damage to the typhoon. And aims to provide basic data for the rural areas of strong winds and typhoons preparedness and facility design based on the results. Judging from the results of the analysis of natural disasters caused by typhoons and strong winds, the city formed mainly in the area than in the plains or coastal rural areas compared to other areas more damage can appear. In recent years, many design maximum wind speed of 40m/s wind over because disaster type, even if the standard installation, preferably determined through a precise structural analysis to ensure the structural history of acting urgently.

• 대한설비공학회:학술대회논문집
• /
• 대한설비공학회 2009년도 하계학술발표대회 논문집
• /
• pp.1503-1506
• /
• 2009

Bubble jet loop heat pipe is a newly devised variation of heat pipe in which heat is effectively transported by the latent heat of evaporation and condensation as well as the heat capacity of circulating working fluid. The circulatory and oscillating motion of the working fluid becomes possible by the motion of bubble jet which is generated at a narrow circular gap. These bubbles are condensed at the condensing section. Bubble jet loop heat pipe makes it possible to carry heat long distances upward and horizontal directions. Because Its structure is a very simple and a low cost, it is available for the floor heating, vinyl house heating, the defrosting of heat pump system and home refrigerator.

• 한국산학기술학회논문지
• /
• 제16권10호
• /
• pp.6823-6831
• /
• 2015

이 연구는 주요 시설채소 작목인 오이(반촉성) 농가의 경영현황을 진단하고 개별 오이농가의 생산효율성 증대를 위해 필요한 요인을 도출하고 있다. 주요 경영지표 검토 및 세부 경영효율성 분석 결과 오이농가에는 향후 규모화보다는 기술효율성 증대를 통한 생산효율성 증대 가능성이 더 높은 것으로 나타났다. 생산량은 순수기술효율성과 양의 상관관계를 가지지만 그 정도가 미미해, 일정한 조건 하에서는 순수기술효율성 증대를 위해 투입요소의 절감이 더 시급한 것으로 도출되었다.

• 농촌계획
• /
• 제3권2호
• /
• pp.71-80
• /
• 1997

The city's countryside is adjusting to change by urbanization. The recent changes in rural landuse and damages of local landscape characteristics are very serious. But, few studies address the relationship between land-use and quality of landscape for these area. The aim of this study is to clarify causes and problems of the change through investigating changes of landscape as a function of land-use. The results are as follows 1) The change of landscape can be seen as a functional of land-use. Landscapes are characterized by changes of regional environments. These are the urban-rural fringe area which need special consideration for urban development and also for rural landscape quality. 2) 11 types of landscape patterns are found for landscape management. these are Regional commercial area, Apartment development, Recreation & seisure, Golfs, Housing complex, Industrial complex, Vinyl house, Rural village, Evaded facilities, Rivers, Cultural heritages. These landscape types are explained as 'stimuli-responses model'in Bryant's Forces of urbanization. 3) The policy implications of these study are as follows : First is the necessity of landscape management in Grown Management Zone and Natural Reserved Zone in the Metropolitan level, Second is the necessity of development control in semi- agricultural area. The last is the necessary of long range management plan in the urban-rural fringe area.

• 한국환경보건학회지
• /
• 제34권3호
• /
• pp.219-225
• /
• 2008

Many building materials may contain high concentrations of volatile organic compounds (VOCs) and other hazardous pollutants(HAPs). Specifically, VOCs discharged by indoor building material may cause "new house" syndrome, atopic dermatitis etc. The diffusion coefficient and initially contained total VOC quantity were determined using microbalance experiments and small chamber tests. Interactions between volatile organic compounds (VOCs) and vinyl flooring (VF), a relatively homogenous, diffusion-controlled building material, were characterized. Rapid determination of the material/air partition coefficient (K) and the material-phase diffusion coefficient (D) for each VOC was achieved by placing thin VF slabs in a dynamic microbalance and subjecting them to controlled sorption/desorption cycles. K and D are shown to be independent of concentration for all of the VOCs and water vapor. This approach can be applied to other diffusion-controlled materials and should facilitate the prediction of their source/sink behavior using physically-based models.

• 드라이브 ㆍ 컨트롤
• /
• 제15권4호
• /
• pp.81-90
• /
• 2018

Indoor construction site such as building demolition sites, tunnel, vinyl house, and cattle shed are subject to various risk factors such as falling stones, soot and bad odors. However, most of the mini excavators have no cabin that can protect the driver from such risk factors. Therefore, researches on remote control technology of construction equipment are actively conducted as a method for protecting the driver from the risk factors occurring in the working environment. For effective remote control, it is necessary to be able to control the travelling and work using a portable small transmitter. However, due to the limitation of the size of the transmitter, complex operation control is required to control two or more actuators with a single joystick. Also, it is essential to check how remote control characteristics change in various environments such as distance, signal strength, obstacle. Therefore, in this study, an algorithm that can control two actuators simultaneously with a single joystick signal was developed, and a communication method suitable for indoor and outdoor mini construction equipment by analyzing experimentally how the remote control characteristics vary according to various work environments and telecommunication methods proposed.

• 생물환경조절학회지
• /
• 제15권2호
• /
• pp.184-189
• /
• 2006

하우스와 하우스 사이에 비닐 멀칭이 참외의 생육 및 품질에 미치는 영향을 검토한 결과는 다음과 같다. 토양수분은 무처리구의 26.0%에 비하여 흑색부직포 및 흑색필름 처리구에서 각각 1.2%, 2.9%정도 적었으나, 지온은 무처리구 $2.4^{\circ}C$에 비하여 흑색부직포 및 흑색필름 처리구에서 각각 $0.8^{\circ}C,\;1.8^{\circ}C$ 더 높았다. 무처리구에 비하여 흑색필름 처리구에서 초장, 엽수, 엽록소 함량, 엽면적 및 일비액량 등 초기생육이 우수하였으며, 개화도 빠르고 성숙 소요일수도 단축되었다. 과중, 당도 등 과실의 품질도 흑색필름 처리구에서 우수하였고 발효과율 및 기형과율이 감소하여 상품과율이 증가하여 10a당 상품과수량은 무처리구의 1,864kg에 비하여 흑색필름 처리구에서 28%증가하였다. 이와 같이 흑색필름 처리구에서 참외의 과중이 무겁고, 당도가 높고 발효과 발생이 감소하고 상품수량이 증가한 것은 하우스 동간 멀칭으로 수분 유입이 차단되어 지온이 상승하여 뿌리의 활착이 빨라 생육이 촉진됨에 따라 과실의 품질이 향상된 것으로 생각된다.