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Effects of Covering Materials and Methods on Heat Insulation of a Plastic Greenhouse and Growth and Yield of Tomato (플라스틱하우스의 보온피복 재료 및 방법이 보온력과 토마토의 생육 및 수량에 미치는 영향)

  • Kwon Joon Kook;Lee Jae Han;Kang Nam Jun;Kang Kyung Hee;Choi Young Hah
    • Journal of Bio-Environment Control
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    • v.13 no.4
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    • pp.251-257
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    • 2004
  • This experiment was carried out to investigate the effects of different covering materials and methods on heat insulation of a plastic greenhouse, growth and yield of tomato. Night air and soil temperatures in a double-layer greenhouse with external multifold thermal cover (MTC; eight-ounce cassimere+four-fold polyform+double-fold non-woven fabric+single-fold polypropylene covering were about $1^{\circ}C$ lower than in that with internal MTC covering, but about $3^{\circ}C$ higher than in that with an EVA film screen. Tomato yield in the external MTC covering increased by $2\%\;and\;19\%$ as compared to that in the internal MTC covering and the non-covering of MTC, respectively, due to its high light transmission and insulation effect. Night air temperatures in a double-layer greenhouse with external MTC covering and with thermal screen (polyester plus aluminium) were $2.2^{\circ}C\;and\;4.5^{\circ}C$ higher than those in a double-layer greenhouse with an external MTC covering and in a double-layer greenhouse equipped an EVA film screen, respectively. Tomato yield in the treatment with external MTC covering and a thermal screen was $18\%\;and\;37\%$ greater than that in the external MTC covering and in an EVA film screen, respectively. Results indicate that tomato could be grown without heating or with minimal heating in a double-layer greenhouse covered with MTC and a thermal screen during the winter season in sourthern regions of Korea.

Dyeabilities of Elastic Composite Yarn Woven Fabrics (탄성복합사를 이용한 직물의 염색성에 대한 연구)

  • Kim, Ji-Yeon;Kim, Sang-Wook;Min, Mun-Hong;Lee, Sang-Bong;Park, Yeon-Bong;Kang, Shin-Hyeok;Yeum, Jeong-Hyun
    • Proceedings of the Korean Society of Dyers and Finishers Conference
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    • 2012.03a
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    • pp.108-108
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    • 2012
  • 이전의 연구에서 기존의 ATY 장치에 ITY 노즐을 접목하여 개조한 사가공기로 제조한 탄성복합사를 자동차 시트용 트리코트 원단으로 편직하여 일광견뢰도가 우수한 염료를 선정하고 $125^{\circ}C$에서 염색하여야 견뢰도와 spandex의 물성을 저해하지 않음을 알 수 있었다. 폴리에스테르 탄성복합사의 염색성 평가에 이어 본 연구에서는 나일론 필라멘트 (70/24, Full-dull, 2ply사와 40D spandex 1ply사 복합)와 레이온사(75D, 1ply)를 투입하여 직물 원단(중량 216g/yd, 밀도 경사 78, 위사 52본/inch)을 제직한 후 2욕에서의 염색공정을 거칠 경우, 탄성복합사의 견뢰도와 물성에 미치는 영향을 조사하였다. 나일론, 레이온, 폴리우레탄의 3종 원단을 염색성 평가를 위하여 반응성염료로 먼저 레이온 부분을 염색한 후 산성염료로 나일론 부분을 염색하였으며, 이 때 spandex가 미치는 영향을 비교하기 위하여 spandex가 함유되지 않은 나일론, 레이온 복합 제직원단도 함께 염색한 후 견뢰도를 평가하였다. 또한, 레이온 부분은 CPB염색법과 제트염색기로 나누어 염색하여 염색기에 따른 인장강도와 인열강도를 평가하였다. 레이온 염색에는 셀룰로오스용 2관능기 반응성염료 3원색을 이용하여 khaki color로 combination염색하였으며, 나일론 부분에는 입자크기가 커서 견뢰도가 우수한 산성염료를 선정하여 combination염색한 후 냉수세하였다. 견뢰도를 비교한 결과, spandex가 포함된 탄성복합사 원단과 나일론과 레이온 만으로 제직된 원단 모두 세탁, 마찰, 물, 땀, 일광 견뢰도 모두가 4~5급으로 우수하여 spandex에 이염된 염료가 견뢰도에 미치는 영향은 없음을 확인하였다. 또한, 레이온 부분의 반응성염료 염색 시 CPB와 제트염색법의 두 가지 종류에 대한 인장강도와 인열강도 평가결과는 CPB 염색물이 제트염색물보다 약간 높게 나타났지만 3% 이내의 차이로 거의 차이가 없음을 나타내었다. 일반적으로 제트염색 시 원단은 로프상으로 이동하고, CPB염법은 확포상태 그대로 염색되기 때문에 제트염색 시 강도가 낮아지는 것으로 알려져 있으나, 본 연구에서는 탄성복합사를 경사, 위사 모두 사용함으로써 spandex가 신장하는 특성 때문에 강도의 저하가 없는 것으로 사료된다.

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Nitrate and Phosphate Adsorption Properties by Aminated Vinylbenzyl Chloride Grafted Polypropylene Fiber (아민형 PP-g-VBC의 NO3-N과 PO4-P 흡착특성)

  • Lee, Yong-Jae;Song, Jee-June;Na, Choon-Ki
    • Journal of Korean Society of Environmental Engineers
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    • v.38 no.10
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    • pp.543-550
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    • 2016
  • Amine-type PP-g-VBC-EDA adsorbent, which possesses anionic exchangeable function, was prepared through photoinduced graft polymerization of vinylbenzyl chloride (VBC) onto polypropylene non-woven fabric and subsequent amination reaction using ethylenediamine (EDA). Adsorption characteristics of anionic nutrients on the PP-g-VBC-EDA adsorbent have been studied by batch adsorption experiments. The equilibrium data well fitted the Langmuir isotherm model, and the maximum monolayer sorption capacity was found to be 59.9 mg/g for $NO_3-N$ and 111.4 mg/g for $PO_4-P$. The adsorption energies were higher than 8 kJ/mol indicating anion-exchange process as the primary adsorption mechanism. The pseudo-second order kinetic model described well the kinetic data and resulted in the activation energy of 9.8-36.7 kJ/mol suggesting that the overall rates of $NO_3-N$ and $PO_4-P$ adsorption are controlled by the chemical process. Thermodynamic parameters such as ${\Delta}G^o$, ${\Delta}H^o$ and ${\Delta}S^o$ indicated that the adsorption nature of PP-g-VBC-EDA for anionic nutrients is spontaneous and exothermic. The PP-g-VBC-EDA could be regenerated by washing with 0.1 N HCl.

The Restoration Effect of Deltacon Method in Coastal Erosion (Deltacon공법을 통한 해안 침식지의 복구 효과 연구)

  • Han, Bong-Ho;Park, Seok-Cheol;Lee, Poong
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.20 no.6
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    • pp.35-50
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    • 2017
  • This study is to see the recovery effect of the Deltacon method by investigating the amount of sand deposition, the topographical cross section and the vegetation structure; and to derive the effective recovery method of coastal erosion area. The target areas of this study include Jinri coastal dune, Bajireum coastal dune and Seopori coastal dune in Deokjeok-do Island, Ongjin-gun, Incheon. In order to assess the current status of the coastal erosion area recovery, the soil profile structure map was prepared on the site and then the amount of sand deposition within 1m was calculated indoors. The vegetation recovery status of the costal erosion area was assessed via the analyses of the topographical profile structure and the plant community structure, and we aim to derive the effective recovery plan of the Deltacon method with the results. With the Deltacon method, structures with ductile material, special non-woven fabric bags filled with soil and vegetation can be performed therefore the structuralstability and prevention of sand erosion can be achieved. The amounts of sand deposition of Bajireum coastal dune, Seopori costal dune and Jinri costal dune were calculated $0.98{\sim}2.54m^3$, $1.02{\sim}2.96m^3$, and $0.27{\sim}0.75m^3$, respectively, and it is considered that the costal erosion recovery is actively performed for Bajireum costal dune and Seopori costal dune. The analysis results of vegetation structures by topography show that the installation of the send collecting net in steep areas has been highly effective and the Deltacon-constructed target areas have been restored to vegetation and the costal dune, which is similar to the natural dune. The investigation of the plant community structure in Deokjeok-do Island costal dune, Incheon displayed similar research results of the existing costal dune flora and confirmed the emergence of Lathyrus japonicus, Carex kobomugi, Elymus mollis, Vitex rotundifolia, and Calystegia soldanella and others. In order to carry out further effective recovery with the Deltacon method, improvements to rootage of herbaceous vegetation are needed in areas without foredune herbaceous vegetation, and continuos maintenance & management monitoring of connected windbreak forest to costal dunes are also necessary.

A Study on the Merchandising Conditions for Local Infants' Wear Brands (국내(國內) 유아복(幼兒服) 브랜드 상품기획(商品企劃) 실태조사(實態調査) 연구(硏究))

  • Park, Eun-Mi;Sohn, Hee-Soon
    • Journal of Fashion Business
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    • v.3 no.1
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    • pp.113-124
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    • 1999
  • The purpose of this study is to provide for the basic data useful to designing a scientific and systematic merchandising program for infants' wear brands. For this purpose, designer and MD working for 8 local infants' wear brands were surveyed to analyze the conditions of their designing and merchandising of infants' wears. The results of this study can be summarized as follows; 1. Only 3 brands employed MD for their merchandising departments. The average number of clothing designers employed by the subject brands was 3-5, while that of colorists was 1-2, and that of accessory designers was 2-3. On the other hand, the average number of patternmakers employed was about 1, while that of sewer was 4. 2. Many of the sample infants' wear brands tended to collect and analyze the information for merchandising, while most of them relied less on outside planned data. The information source upon which they relied most was 'local and foreign fashion magazine', followed by 'data surveyed by local and foreign department stores' and 'data surveyed for local fabric markets' in their order. Meanwhile, the main color represented 70-90% of the total colors, while the pastel groups accounted for 30-40% and vivid color groups for 40-50%. On the other hand, knit accounted for about 60% of their materials, while woven and sweater accounted for 30% and 10%, respectively. 3. In overall terms, most of brands felt that their brands were preferred as much as or less than their competitive brands, while consumers felt expensive for infants' wears. Namely, most consumers were dissatisfied with the price levels of infants' wears. On the other hand, consumers were found to favor the pastel color groups a little more, while being aware of each brand's sizes more or less precisely. 4. The medium upon which the infants' wear brands depended most for their advertisement was 'magazine', followed by 'radio' and 'catalogue' in their order. Most of them were analyzing the results of their sale turnover monthly or frequently in order to review their sales performances in comparison with their competitors. Most of brands bothered to program a sale strategy 4 times a year, primarily to dispose the stocks or find a breakthrough for their sales activities.

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Development of a flower support for real flower decoration Automatic Production System (생화 장식 꽃받침 자동 생산 시스템 개발)

  • Song, Myung-Seok;Kim, Man-Joong;Kim, Seon-Bong;Ji, Peng;Ryuh, Beom-Sahng
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.19 no.7
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    • pp.63-71
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    • 2018
  • A flower support was developed for real flower decoration automation production system using an ultrasonic wave sealer to automatically produce a system. Because a flower support for real flower decoration that was produced manually could not meet the needs of the consumers, this study developed an automated manufacturing system to increase productivity. A flower support for real flower decoration was constructed using a cap consisting of plastic and plate made from non-woven fabric. The guide was designed to transport the cap to the ultrasonic wave sealer and optimal guide was developed from the test according to the material and shape. To produce the entire system, the guides and accessories were weighed and appropriate motors and pulleys were calculated. Control of the automation production system was based on a PCB board, which increased the reliability and security, and a remote controller with manual and automatic modes was prepared. After development, tests of the transfer precision and repetition accuracy revealed an X-axis of 2.7mm, a Y-axis of 1 mm, and a repetition of 0 mm. The productivity was also checked. The automated machine worked 8 hours/day to make 35 supports and 70 Therefore, the automatic system produces 200% more output than manual work

Art and Collectivity (미술과 집단성)

  • Kwok, Kian-Chow
    • The Journal of Art Theory & Practice
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    • no.4
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    • pp.181-202
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    • 2006
  • "When it comes to art, nationalism is a goodticket to ride with", says the title of a report in the Indian Express (Mumbai, 29 Oct 2000). The newspaper report goes on to say that since Indian art was kept "ethnic" by colonialism, national liberation meant opening up to the world on India's own terms. Advocacy, at the tail end of the 20th century, would contrast dramatically with the call by Rabindranath Tagore, the founder of the academy at Santiniketan in 1901, to guard against the fetish of nationalism. "The colourless vagueness of cosmopolitanism," Tagore pronounced, "nor thefierce self-idolatry of nation-worship, is the goal of human history" (Nationalism, 1917). This contrast is significant on two counts. First is the positive aspect of "nation" as a frame in art production or circulation, at the current point of globalization when massive expansion of cultural consumers may be realized through prevailing communication networks and technology. The organization of the information market, most vividly demonstrated through the recent FIFA World Cup when one out of every five living human beings on earth watched the finals, is predicated on nations as categories. An extension of the Indian Express argument would be that tagging of artworks along the category of nation would help ensure greatest reception, and would in turn open up the reified category of "art," so as to consider new impetus from aesthetic traditions from all parts of the world many of which hereto fore regarded as "ethnic," so as to liberate art from any hegemony of "international standards." Secondly, the critique of nationalism points to a transnational civic sphere, be it Tagore's notion of people-not-nation, or the much mo re recent "transnational constellation" of Jurgen Habermas (2001), a vision for the European Union w here civil sphere beyond confines of nation opens up new possibilities, and may serve as a model for a liberated sphere on global scale. There are other levels of collectivity which art may address, for instance the Indonesian example of local communities headed by Ketua Rukun Tetangga, the neighbourhood headmen, in which community matters of culture and the arts are organically woven into the communal fabric. Art and collectivity at the national-transnational level yield a contrasting situation of, on the idealized end, the dual inputs of local culture and tradition through "nation" as necessary frame, and the concurrent development of a transnational, culturally and aesthetically vibrant civic sphere that will ensure a cosmopolitanism that is not a "colourless vagueness." In art historical studies, this is seen, for instance, in the recent discussion on "cosmopolitan modernisms." Conversely, we may see a dual tyranny of a nationalism that is a closure (sometimes stated as "ethno-nationalism" which is disputable), and an internationalism that is evolved through restrictive understanding of historical development within privileged expressions. In art historical terms, where there is a lack of investigation into the reality of multiple modernisms, the possibility of a democratic cosmopolitanism in art is severely curtailed. The advocacy of a liberal cosmopolitanism without a democratic foundation returns art to dominance of historical privileged category. A local community with lack of transnational inputs may sometimes place emphasis on neo-traditionalism which is also a double edged sword, as re kindling with traditions is both liberating and restrictive, which in turn interplays with the push and pull of the collective matrix.

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Sustainability Indices (=Green Star) for Microbial Fuel Cell (미생물 연료전지 영속발전 지표개발)

  • Song, Ha-Geun;KOO, Ja-Kong
    • Journal of the Korea Organic Resources Recycling Association
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    • v.23 no.2
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    • pp.47-52
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    • 2015
  • A microbial fuel cell (MFC) is a device that can be obtained electricity from a variety of organic through the catalytic reaction of the microorganism. The MFC can be applied to various fields, and research is required to promote the performance of the microbial fuel cell for commercialization. The lower performance of an MFC is due to oxygen reduction at the cathode and the longer time of microbial degradation at anode. The MFC amount of power is sufficient but, in consideration of many factors, as a renewable energy, now commonly power density as compared to Nafion117 it is an ion exchange membrane used is PP (Poly Propylene) from 80 to about 11 fold higher, while reducing the cost to process wastewater is changed to a microporous non-woven fabric of a low cost, it may be energy-friendly environment to generate electricity. All waste, in that it can act as a bait for microorganisms, sustainability of the microbial fuel cell is limitless. The latest research on the optimization and performance of the operating parameters are surveyed and through the SSaM-GG(Smart, Shared, and Mutual- Green Growth) or GG-SSaM(Green Growth - Smart, Shared, and Mutual) as the concept of sustainable development in MFC, the middle indices are developed in this study.

The Salt Removal Efficiency Characteristics of Carbon Electrodes Using Fabric Current Collector with High Tensile Strength in a Capacitive Deionization Process (인장강도가 뛰어난 직물집전체를 이용한 탄소전극의 축전식 탈염공정에서의 제염효과)

  • Seong, Du-Ri;Kim, Dae Su
    • Korean Chemical Engineering Research
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    • v.58 no.3
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    • pp.466-473
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    • 2020
  • Fabric current collector can be a promising electrode material for Capacitive Deionization (CDI) system that can achieve energy-efficient desalination of water. The one of the most attractive feature of the fabric current collector is its high tensile strength, which can be an alternative to the low mechanical strength of the graphite foil electrode. Another advantage is that the textile properties can easily make shapes by simple cutting, and the porosity and inter-fiber space which can assist facile flow of the aqueous medium. The fibers used in this study were made of woven structures using a spinning yarn using conductive LM fiber and carbon fiber, with tensile strength of 319 MPa, about 60 times stronger than graphite foil. The results were analyzed by measuring the salt removal efficiency by changing the viscosity of electrode slurry, adsorption voltage, flow rate of the aqueous medium, and concentration of the aqueous medium. Under the conditions of NaCl 200 mg/L, 20ml/min and adsorption voltage 1.5 V, salt removal efficiency of 43.9% in unit cells and 59.8% in modules stacked with 100 cells were shown, respectively. In unit cells, salt removal efficiency increases as the adsorption voltage increase to 1.3, 1.4 and 1.5 V. However, increasing to 1.6 and 1.7 V reduced salt removal efficiency. However, the 100-cell-stacked module showed a moderate increase in salt removal efficiency even at voltages above 1.5 V. The salt removal rate decreased when the flow rate of the feed was increased, and the salt removal rate decreased when the concentration of the feed was increased. This work shows that fabric current collector can be an alternative of a graphite foil.

EFFECT OF THE LATENCY PERIOD ON ALVEOLAR RIDGE DISTRACTION USING THE INTRAORAL DISTRACTION DEVICE IN DOGS (구내 신연장치를 이용한 치조골 신연에 미치는 잠복기의 영향)

  • Oh, Yu-Keun;Oh, Hee-Kyun;Ryu, Sun-Youl
    • Maxillofacial Plastic and Reconstructive Surgery
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    • v.23 no.4
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    • pp.324-331
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    • 2001
  • The present study was aimed to investigate the effects of latency period on alveolar ridge distraction using the intraoral distraction device. Nine adult mongrel dogs of either sex, weighing about 15kg, were used. They were divided into 3-day, 5-day, and 7-day groups according to the latency period. The left upper and lower premolars and first molars were extracted. Twelve weeks after the extraction, an osteotomy was performed and the distraction device was applied. After the latency period, the distraction was applied at a rate of 1.2mm for 8 days. The distraction device was left in place for 2 weeks to allow consolidation and was then removed. The animals were sacrified at 8 weeks after completion of distraction and were examined macroscopically, radiographically, and histologically. After completion of the distraction, the alveolar crest protruded prominently, showing the vertical augmentation of the alveolar bone. Soft tissues were broken down after the 6th day of distraction in 3-day latency group, and premature union occurred on the 7th day of distraction in the 7-day latency group. The average distance was $9.40{\pm}0.3mm$ in 3-day latency group, $9.35{\pm}0.1mm$ in 5-day latency group, and $8.85{\pm}0.1mm$ in 7-day latency group. In the radiograph taken at 8 weeks after distraction, there was slight bone resorption around the medial and distal edges of the alveolar bone segment, and a new bone deposition was observed in the neighboring alveolar crest area in all groups. Fibrous tissues were present in a part of the buccal cortical bone area of the distraction gap, and the woven and lamellar bones were observed in the distracted gap. There were bony bridges in the distraction gap in all animals examined. These results suggest that optimal time of latency period on alveolar ridge distraction using the intraoral distraction device is about 5 days in dogs, and about 7days in human beings.

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