• 한국유기농업학회지
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• 제26권3호
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• pp.453-462
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• 2018

본 연구는 HACCP 제도를 적용하고 있는 소규모, 중규모, 대규모 양돈농장의 HACCP 제도 적용 전과 후의 폐사율을 비교분석하기 위한 목적으로 실시하였다. 본 연구를 위하여 전국에 산재한 60개의 양돈농장(소규모, 중규모, 대규모 양돈농장 각각 20개)을 선별하였다. 선별된 양돈농장의 평균 사육두수는 소규모 1,429.72두, 중규모 양돈농장은 3,392.95두 그리고 대규모 양돈농장은 1,034.60두로 조사되었다. 폐사 원인 구분은 호흡기로 인한 폐사, 설사로 인한 폐사, 유산 및 사산으로 인한 폐사, 사고로 인한 폐사 그리고 기타 폐사로 구분하여 분류하였다. 소규모 농장의 평균 폐사두수는 HACCP 적용 전 373.25두로 조사되었으나 HACCP 적용 후에는 334.49두로 통계적 유의성 없이 감소하였다. 중규모 농장은 HACCP 적용 전에 평균 615.09두가 폐사하였으나 HACCP 적용 후에는 558.09두로 유의적으로 감소하였다. 또한 대규모 양돈농장도 HACCP 적용 전에는 평균 폐사두수가 887.17두에서 HACCP 적용 후에는 696.56두로 21.60%가 감소한 것으로 조사되었다. 이러한 결과는 HACCP 제도 중 선행요건프로그램에 해당되는 농장방역, 소독, 사육환경관리, 체계적인 시설 및 위생관리, 질병관리 등으로 인하여 나타나는 효과인 것으로 판단된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.134.2-134.2
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• 2014

Photonic crystal solar cells have the potential for addressing the disparate length scales in polymer photovoltaic materials, thereby confronting the major challenge in solar cell technology: efficiency. One must achieve simultaneously an efficient absorption of photons with effective carrier extraction. Unfortunately the two processes have opposing requirements. Efficient absorption of light calls for thicker PV active layers whereas carrier transport always benefits from thinner ones, and this dichotomy is at the heart of an efficiency/cost conundrum that has kept solar energy expensive relative to fossil fuels. This dichotomy persists over the entire solar spectrum but increasingly so near a semiconductor's band edge where absorption is weak. We report a 2-D, photonic crystal morphology that enhances the efficiency of organic photovoltaic cells relative to conventional planar cells. The morphology is developed by patterning an organic photoactive bulk heterojunction blend of Poly(3-(2-methyl-2-hexylcarboxylate) thiophene-co-thiophene) and PCBM via PRINT, a nano-embossing method that lends itself to large area fabrication of nanostructures. The photonic crystal cell morphology increases photocurrents generally, and particularly through the excitation of resonant modes near the band edge of the organic PV material. The device performance of the photonic crystal cell showed a nearly doubled increase in efficiency relative to conventional planar cell designs. Photonic crystals can also enhance performance of other optoelectronic devices including organic laser.

• Steel and Composite Structures
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• 제46권1호
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• pp.15-31
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• 2023

Organic solar cells utilized natural polymers to convert solar energy to electricity. The demands for green energy production and less disposal of toxic materials make them one of the interesting candidates for replacing conventional solar cells. However, the different aspects of their properties including mechanical strength and stability are not well recognized. Therefore, in the present study, we aim to explore the chaotic responses of these organic solar cells. In doing so, a specific type of organic solar cell constructed from layers of material with different thicknesses is considered to obtain vibrational and chaotic responses under different boundaries and initial conditions. A square plate structure is examined with first-order shear deformation theory to acquire the displacement field in the laminated structure. The bounding between different layers is considered to be perfect with no sliding and separation. On the other hand, nonlocal elasticity theory is engaged in incorporating the structural effects of the organic material into calculations. Hamilton's principle is adopted to obtain governing equations with regard to boundary conditions and mechanical loadings. The extracted equations of motion were solved using the perturbation method and differential quadrature approach. The results demonstrated the significant effect of relative glass layer thickness on the chaotic behavior of the structure with higher relative thickness leading to less chaotic responses. Moreover, a comprehensive parameter study is presented to examine the effects of nonlocality and relative thicknesses on the natural frequency of square organic solar cell structure.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1194-1196
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• 2003

Variations in soil physical and chemical properties can affect agricultural productivity and the environmental implications of crop production. These variations are present and may be important at regional, field, and sub-field (precision agriculture) scales. Because traditional measurements are time-consuming and expensive, reflectance-based estimates of soil properties such as texture, organic matter content, water content, and nutrient status are attractive. Soil properties have been related to reflectance measured with laboratory, in-field, airborne, and satellite sensors. Both multispectral and hyperspectral instruments have been used, with both natural and artificial illumination. Varying levels of accuracy have been obtained, with the best results (r > 0.95) using hyperspectral reflectance data to estimate soil organic matter and water content.

• 한국유기농업학회지
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• 제12권2호
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• pp.153-169
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• 2004

This study attempted to identify relative evaluation to its attributes and improvement of consumer's demand in the Environment-Friendly Agricultural Products(EFAP). To identify the consumption patterns of EFAP, a series of household surveys were conducted for housewives residing in Seoul and its metropolitan area(Bundang and Ilsan). the sample size of the survey is 366 respectively. This study operated relative evaluation of EFAP by Multi-Demential Scales(MDS) about 10 attributes that this study set up. As the result, the consumers recognized that EFAP is "protection of ecosystem", "food safety", "good for growth of children", "high quality", and in case of conventional farming products is "inexpensive price", and "diversity of purchasing items". This trend has significant implications to the structure of EFAP output and how positioning strategies, and approaches should be properly formulated and implemented.

• 한국재료학회:학술대회논문집
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• 한국재료학회 2009년도 추계학술발표대회
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• pp.4.1-4.1
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• 2009

The dream of futurists andtechnologists is to build complex, multifunctional machines so small that theycan only be seen with the aid of a microscope. The unprecedented technologyadvancements in miniaturizing integrated circuits on semiconductors, and theresulting plethora of sophisticated, low cost electronic devices demonstratethe impact that micro/nano scale engineering can have when applied only to thearea of electrical and computer engineering. Emerging research efforts indeveloping organic and inorganic nano materials together with using micro/nanofabrication techniques for implementing integrated multifunctional devices hopeto yield similar revolutions in other engineering fields. By cross linking theindividual engineering fields through micro/nano technology, various organicand inorganic materials and miniaturized system devices can be developed thatwill have future impacts in the IT and life science applications. Yet to buildthe complex micromachines and nanomachine of the future, engineering will needto develop the technology capable of seamlessly integrating these materials andsubsystems together at the micro and nano scales. The micromachines of thefuture will be “integrated nanosystems,” complex devices requiring the integration of multiple materials,phenomena, technologies, and functions at the same platform. To develop thistechnology will require great efforts in materials science and engineering, infundamental and applied sciences. In this talk, we will first discuss thenature of micro and nanotechnology research for IT and life sciences, and thenintroduce selected current activities in micro and nanotechnology research fororganic and inorganic materials and devices. The newly developed micro/nanofabrication processes and devices, combined with in-depth scientificunderstandings of materials, can lead to rapid development of next generationsystems for applications in IT and life sciences.

• 반도체디스플레이기술학회지
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• 제20권3호
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• pp.22-26
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• 2021

Thin-film encapsulation (TFE) technology is most effective in preventing water vapor and oxygen permeation in the organic light emitting diodes (OLED). Of those, a laminated structure of Al₂O₃ and MgO were applied to provide efficient barrier performance for increasing the stability of devices in air. Atomic layer deposition (ALD) method is known as the most promising technology for making the laminated Al₂O₃/MgO and is used to realize a thin film encapsulation technology in organic light-emitting diodes. Atomic layer deposited inorganic films have superior barrier performance and have advantages of excellent uniformity over large scales at relatively low deposition temperatures. In this study, the control system of the MgCP₂ precursor for the atomic layer deposition of MgO was established in order to deposit the MgO layer stably by the injection time of second level and the stable heating temperature. The deposition rate was obtained stably to be from 4 to 10 Å/cycle using the injection pulse times ranging from 3 to 12 sec and a substrate temperature ranging from 80 to 150 ℃.

• Ocean and Polar Research
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• 제40권2호
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• pp.77-85
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• 2018

We observed the concentrations of Dissolved Organic Carbon (DOC) and Colored Dissolved Organic Matter (CDOM) in coastal seawater and groundwater around a volcanic island, Jeju, Korea. The sampling of surface seawater and coastal groundwater was conducted in Woljeongri, Pyoseon, and Kwakgi beaches, in three sampling campaigns (June, July, and October 2016). The concentrations of DOC in groundwater were relatively higher in June and October than in July. Salinity and DOC concentrations in the coastal groundwater of Woljeongri and Pyoseon beaches did not show a marked relationship, whereas those in Kwakgi beach showed a good positive correlation (July: $R^2=0.64$, P < 0.01; October: $R^2=0.95$, P < 0.01). In addition, the concentrations of CDOM (C and M peaks) in the groundwater of Woljeongri and Pyoseon beaches, where saline groundwater discharge dominates, were relatively higher than those of Kwakgi beach, where fresh groundwater discharge dominates. The relatively higher DOC concentrations in the coastal groundwater of Woljeongri and Pyoseon, with higher CDOM concentrations, seem to be mainly from anthropogenic sources such as local pollution sources (i.e., aquaculture wastewater or domestic sewage). In order to understand the behavior of DOC in the coastal groundwater of a volcanic island, extensive studies are necessary in the future over a larger-area and greater time-scales using various isotopic tracers.

• The Journal of Asian Finance, Economics and Business
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• 제7권6호
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• pp.233-240
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• 2020

This study uses the moderating model to explore the relationships between Corporate Social Responsibility (CSR) associations, brand awareness and consumer purchase intention. Besides investigating the direct effects of CSR associations on brand awareness and consumer purchase intention, this study also focuses on discovering the moderating role of CSR associations on the relationship between brand awareness and consumer purchase intention among Vietnamese students. Adapting scales from previous research, the authors distribute questionnaires to consumers across the country. Then, the validity and reliability are tested via Cronbach's alpha, Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA). Moreover, by employing a meta-analytical path analysis with a sample of 686 consumers, the authors show that CSR associations play an important role in shaping purchase intention among Vietnamese consumers regarding the consumption of organic milk products. Also, CSR associations have a strong effect on brand awareness. However, our study shows that purchase intention is not directly affected by brand awareness. In other words, brand awareness does not mediate the relationship between CSR associations and purchase intention. Interestingly, authors show that CSR associations moderate the link between brand awareness and consumer purchase intention. Based on the research, some recommendations are made to companies that produce organic milk products.

• 한국유기농업학회지
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• 제14권3호
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• pp.251-266
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• 2006

This study was surveyed and analyzed in 2005 year for environmentally-friendly rice's production 78 farmers in korea. The major results was as follows: The average age of farmers were 54 years old, the experiences of environmentally-friendly rice's production farms was 7.4 years, the cultivated scales of environmentally-friendly rice's production was 3.4ha. The 74%'s Farmers of all unified rice's breeds for rice's production of high-grade in quality, the ranking of rice's breeds selection were the high-grade rice's breeds of government>japan rice's breeds. The control of damage by blight and insects were needed environmentally-friendly control, the endured study of this control were very important. To cut down cost of the environmentally-friendly rice for income security of farmers and sustenance of farming will. To receive reasonable price of environmentally-friendly rice, the brand image were raised to consumers, the variety and miniaturization of rice packaging unit were needed in view of consumers. In addition to must be campaigns of publicity through the press and event to consumers, were managed the exchange of rice goods and exchanged e-mail together consumers for the maintenance of confidence. To drive direct marketing between environmentally-friendly rice farmers and consumers through experiential marketing, to diversify the marketing channel. To strengthen public relations at regional level and relationship at the consumers.