• Title/Summary/Keyword: Light reduction rate

Search Result 233, Processing Time 0.03 seconds

Analysis Method of the Damages to Rights of Light due to the Construction of the Bridge in Rural Areas (농촌지역에서 교량건설에 따른 일조 피해 분석 방법)

  • Lim, Jae-Han;Lee, Ji-Young;Jung, Jin-Ju
    • Journal of the Korean Institute of Rural Architecture
    • /
    • v.10 no.1
    • /
    • pp.67-74
    • /
    • 2008
  • Recently, construction of bridges in rural areas has been increased to preserve the natural environment. However this brings forth the disputes over rights of light in farmland. In urban areas, the disputes over rights of light have been settled on the authority of the national architectural law and only sunshine hours for winter solstice are considered. Basically, the point at issue is different between each case. The main issues of the dispute in rural area were the reduction of the crop cultivation and the increase of the heating cost in winter. The purpose of this study is to review the mediation process in national environmental dispute resolution commission to resolve these issues, and to set up the analysis method of rights of light and modelling equation of solar position. Furthermore, we aimed at analyzing the damaged hours of daylights in rural housing and the infringement rate of daylight in farmland through the case study. In conclusion, we estimated the sunshine hours during the whole damaged periods according to the elements of bridges, and presented the solution process of dispute over rights of light due to the construction of bridge in rural area.

  • PDF

Effects of Ozone on $CO_2$ Assimilation and PSII Function in Two Tobacco Cultivars with Different Sensitivities

  • Yun, Myoung-Hui
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.22 no.E2
    • /
    • pp.89-98
    • /
    • 2006
  • Two tobacco cultivars (Nicotiana tabacum L.), Bel-B and Bel-W3, tolerant and sensitive to ozone, respectively, were grown in a greenhouse supplied with charcoal filtered air and exposed to 200 ppb ozone for 4 hr. Effects on chlorophyll fluorescence, net photosynthesis, and stomatal conductance are described. Quantum yield was calculated from chlorophyll fluorescence and the initial slope of the assimilation-light curve measured by the gas exchange method. Only the sensitive cultivar, Bel-W3, developed visual injury symptoms on up to 50% of the $5^{th}$ leaf. The maximum net photosynthetic rate of ozone-treated plants was reduced 40% compared to control plants immediately after ozone fumigation in the tolerant cultivar; however, photosynthesis recovered by 24 hr post fumigation and remained at the same level as control plants. On the other hand, ozone exposure reduced maximum net photosynthesis up to 50%, with no recovery, in the sensitive cultivar apparently causing permanent damage to the photosystem. Reductions in apparent quantum efficiency, calculated from the assimilation-light curve, differed between cultivars. Bel-B showed an immediate depression of 14% compared to controls, whereas, Bel-W3 showed a 27% decline. Electron transport rate (ETR), at saturating light intensity, decreased 58% and 80% immediately after ozone treatment in Bel-B and Bel-W3, respectively. Quantum yield decreased 28% and 36% in Bel-B and Bel-W3, respectively. It can be concluded that ozone caused a greater relative decrease in linear electron transport than maximum net photosynthesis, suggesting greater damage to PSII than the carbon reduction cycle.

Acinetobacter sp. A54에 의한 Arabian Light 원유의 분해

  • Lee, Chang-Ho;Kim, Hee-Sik;Suh, Hyun-Hyo;Choi, Soung-Hun;Oh, Hee-Mock;Yoon, Byung-Dae
    • Microbiology and Biotechnology Letters
    • /
    • v.25 no.5
    • /
    • pp.520-526
    • /
    • 1997
  • Bacterial strains which degrade Arabian Light crude oil were isolated by enrichment culture from oil-spilled soil. The strain A54 was finally selected after testing emulsifying activity and oil conversion rate. Strain A54 was identified as a Acinetobacter sp. based on the morphological, biochemical and physiological characteristics. It appears to be highly specialized for growth on Arabian Light crude oil in minimal salts medium since it showed preference for oil or degradation products as substrates for growth. It was found that it could grow on at least fifteen different hydrocarbons. The optimum cultural and environmental conditions were as follows; 25$\circ$C for temperature, 7,5 for pH, 2.0% for NaCl concentration and 2.0% for crude oil concentration. Additionally, the optimal concentration of NH$_{4}$NO$_{3}$, and K$_{2}$HPO$_{4}$, were 12.5 mM and 0.057 mM, respectively. Cell growth and emulsifying activity as a function of time were also determined. Crude oil degradation and the reduction of product peaks were identified by the analysis of remnant oil by gas chromatography. Approximately 63% of crude oil were converted into a form no longer extractable by mixed organic solvents.

  • PDF

A Study on the Control System of Plant Growth Using IT Convergence Technology (IT 융합기술을 이용한 식물생장 제어시스템 연구)

  • Kim, Min-Soo;Jee, Seung-Wook;Kim, Min-Kyu;Cho, Young-Chang
    • Journal of IKEEE
    • /
    • v.22 no.4
    • /
    • pp.959-964
    • /
    • 2018
  • In this study, a study is conducted on a monitoring system that can control the environment of plants using sensors in conjunction with the LED light system and the plant growth control system. To verify the performance of the developed plant growth system, an experiment was conducted on the characteristics of energy efficiency, data transmission rate, and light volume control. The experiment resulted in a satisfactory result by controlling more than 80% energy efficiency, 1Mb/sec wireless communication speed, and 5 levels of optical control. The proposed system can be applied to LED plant facilities and will contribute to the automation of agriculture by organizing an automated system for production efficiency and labor cost reduction for future commercialization.

Dyeing of Silk Fabrics Using Zizania latifolia Turcz. Extract (줄풀을 활용한 견직물의 염색)

  • Lee, Hyesun;Ko, Eunsook
    • Textile Coloration and Finishing
    • /
    • v.30 no.2
    • /
    • pp.150-157
    • /
    • 2018
  • The purpose of this study is to investigate the proper dyeing condition, color fastness and functionality of silk fabrics dyed with Zizania latifolia Turcz. FT-IR spectrum analysis suggests that colorants of Zizania latifolia Turcz. are tannins. The dyeing of the silk fabrics using Zizania latifolia Turcz. was very good even without pretreatment or mordanting treatment. Optimal dyeing conditions of silk fabrics were colorant concentration of 200%(o.w.f.), dyeing temperature of $100^{\circ}C$, dyeing time of 60 minutes and dyebath pH of 5.5. Color fastness of dyed silk fabrics to washing, rubbing, perspiration and light was 4~4-5, 5, 4~4-5(acidic), 4-5(alkaline) and 2 respectively. UV protection rate and deodorization rate of silk fabrics dyed with Zizania latifolia Turcz. were improved. Reduction rate(Staphyloccus aureus) of silk fabrics was excellent at 98.3%. As a result, it was confirmed that the Zizania latifolia Turcz. could be used as an eco-friendly functional natural dye.

Natural Dyeing of Silk Fabric with Scutellaria baicalensis (황금을 이용한 견직물의 자연염색)

  • Kim, Sang-Yool
    • Fashion & Textile Research Journal
    • /
    • v.14 no.2
    • /
    • pp.304-310
    • /
    • 2012
  • The natural dyeing of silk fabric with Scutellaria baicalensis extract was investigated. The proper colorant concentration, dyeing temperature, dyeing time, and pH for the dyeing of silk fabric with Scutellaria baicalensis extract were 90% v/v, $90^{\circ}C$, 60 minutes and pH 3, respectively. In various mordanted methods, the K/S values of mordanted methods were higher than those of unmordanted methods. Light colorfastness and washing colorfastness of Fe mordanted silk fabric was improved by mordanting. The antibacterial properties of dyed and mordanted silk fabric showed a high reduction rate, and Scutellaria baicalensis extract was showed effective bacterial reduction.

Natural dyeing of silk fabrics dyed with extracts of Thuja orientalis (측백 추출물을 이용한 견직물의 천연염색)

  • Kim, Sang Yool
    • The Research Journal of the Costume Culture
    • /
    • v.21 no.5
    • /
    • pp.699-707
    • /
    • 2013
  • The natural dyeing of silk fabric with Thuja orientalis extract was investigated. The proper colorant concentration, dyeing temperature, dyeing time, and pH for the dyeing of silk fabric with Thuja orientalis extract were 100% v/v, $80^{\circ}C$, 80 minutes and pH 3, respectively. In various mordanted methods, the K/S values of mordanted methods were higher than those of unmordanted methods with increasing mordant concentration. Light colorfastness and washing colorfastness of Cu or Fe mordanted silk fabric was improved by mordanting. The antibacterial properties of dyed and mordanted silk fabric showed a high reduction rate, and Thuja orientalis extract was showed effective bacterial reduction. The dyed and mordanted fabric with Thuja orientalis extract showed a superior ultraviolet protection property.

Natural Dyeing of Silk Fabric with Rheum undulatum L. (대황을 이용한 견직물의 천연염색)

  • Kim, Sang-Yool
    • Fashion & Textile Research Journal
    • /
    • v.13 no.3
    • /
    • pp.432-437
    • /
    • 2011
  • The natural dyeing of silk fabric with Rheum undulatum L. extract was investigated. The proper colorant concentration, dyeing temperature, dyeing time, and pH for the dyeing of silk fabric with Rheum undulatum L. extract were 90% v/v, $90^{\circ}C$, 80 minutes and pH 3, respectively. In various mordanted methods, the K/S values of mordanted methods were higher than those of unmordanted methods. Light colorfastness of mordanted silk fabric was improved by mordanting. The antibacterial properties of dyed and mordanted silk fabric showed a high reduction rate, and Cu mordant was showed the most effective bacterial reduction.

Shape and Thickness Optimization of an Aluminium Duo-type LPG Tank for a Passenger Car (승용차용 알루미늄 듀오타입 LPG 탱크의 형상 및 두께 최적설계)

  • So, Soon-Jae;Choi, Gyoo-Jae;Jang, Gang-Won
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.21 no.2
    • /
    • pp.131-135
    • /
    • 2013
  • In this study, to develop a light weight duo type aluminum LPG tank in stead of a conventional steel tank optimization technology is used. Two types of optimization method are carried out for internal compression test simulation of a LPG tank. The first is the thickness only optimization of LPG tank components. The second is the thickness and shape optimization. For the case of the thickness only optimization the weight reduction rate of an optimized tank compare to that of the initial design is 42%. Also 48% weight reduction was achieved for the case of the thickness and shape optimization.

Development of Standardization Algorithm for Indoor Point Cloud Data Based on the Geometric Feature of Structural Components (구조 부재의 형상적 특성 기반의 실내 포인트 클라우드 데이터의 표준화 알고리즘 개발)

  • Oh, Sangmin;Cha, Minsu;Cho, Hunhee
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2023.05a
    • /
    • pp.345-346
    • /
    • 2023
  • As the shape and size of detectable objects diversifying recognition and segmentation algorithms have been developed to acquire accurate shape information. Although a high density of data captured by the repetition of scanning improves the accuracy of algorithms the high dense data decreases the efficiency due to its large size. This paper proposes standardization algorithms using the feature of structural members on indoor point cloud data to improve the process. First of all we determine the reduction rate of the density based on the features of the target objects then the data reduction algorithm compresses the data based on the reduction rate. Second the data arrangement algorithm rotates the data until the normal vector of data is aligned along the coordinate axis to allow the following algorithms to operate properly. Final the data arrangement algorithm separates the rotated data into their leaning axis. This allows reverse engineering of indoor point clouds to obtain the efficiency and accuracy of refinement processes.

  • PDF