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        검색결과 29

        1.
        2023.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The air dilution olfactory method to measure complex odors needs to store and carry odor samples from the field sampling until the analysis in laboratories. Until the analysis of sample in the laboratory, odor dilution factor (odor sensitivity) in the sample bag may decrease over time depending on the characteristics of each odor substances. This is one of the limitation for the air dilution olfactory method. Thus, the air dilution device enable to measure without loss in complex odors of samples. Recently, many studies on the performance test of on-site air dilution devices, i.e., field olfactometer, has been conducted to figure out the feasibility of the field olfactometers. In this study, seven odor samples were collected from five odor emission source sites. And comparative analysis with the air dilution olfactory method was carried out to assess the field applicability of the olfactometer. As results, the performance of the field olfactometer used in this study is regared as the affordable method. The dilution factors from between two methods showed the similar values, indicating low values of standard deviations. In order to ensure the accuracy and precision of measurement data using the field olfactometer, methodology minimized variables (that may affect measurement) needs to establish.
        4,000원
        2.
        2022.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Agrophotovoltaic (APV) system is an integrated system producing crops as well as solar energy. Because crop production underneath Photovoltaic (PV) modules requires delicate management of crops, smart farming equipment such as real-time remote monitoring sensors (e.g., soil moisture sensors) and micro-climate monitoring sensors (e.g., thermometers and irradiance sensors) is installed in the APV system. This study aims at introducing a decision support system (DSS) for smart farming in an APV system. The proposed DSS is devised to provide a mobile application service, satellite image processing, real-time data monitoring, and performance estimation. Particularly, the real-time monitoring data is used as an input of the DSS system for performance estimation of an APV system in terms of production yields of crops and monetary benefit so that a data-driven function is implemented in the proposed system. The proposed DSS is validated with field data collected from an actual APV system at the Jeollanamdo Agricultural Research and Extension Services in South Korea. As a result, farmers and engineers enable to efficiently produce solar energy without causing harmful impact on regular crop production underneath PV modules. In addition, the proposed system will contribute to enhancement of the smart farming technology in the field of agriculture.
        4,000원
        3.
        2022.11 구독 인증기관·개인회원 무료
        Agrophotovoltaic (APV) system is an integrated system producing crops as well as solar energy. Because crop production underneath Photovoltaic (PV) modules requires delicate management of crops, smart farming equipment such as real-time remote monitoring sensors (e.g., thermometers, irradiance sensors, and soil moisture sensors) is installed in the APV system. This study aims at introducing a simulation-based decision support system (DSS) for smart farming in an APV system. The proposed DSS is devised to provide a mobile application service, satellite image processing, real-time data monitoring, and simulation-based performance estimation. Particularly, an agent-based simulation (ABS) is used to mimic functions of an APV system so that a data-driven function and digital twin environment are implemented in the proposed system. The ABS model is validated with field data collected from an actual APV system at the Jeollanamdo Agricultural Research and Extension Services in South Korea. As a result, farmers and engineers enable to efficiently produce solar energy without causing harmful impact on regular crop production underneath PV modules. In addition, the proposed system will contribute to enhancement of the digital twin technology in the field of agriculture.
        9.
        2021.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Iron-based amorphous powder attracts increasing attention because of its excellent soft magnetic properties and low iron loss at high frequencies. The development of an insulating layer on the surface of the amorphous soft magnetic powder is important for minimizing the eddy current loss and enhancing the energy efficiency of highfrequency devices by further increasing the electrical resistivity of the cores. In this study, a hybrid insulating coating layer is investigated to compensate for the limitations of monolithic organic or inorganic coating layers. Fe2O3 nanoparticles are added to the flexible silicon-based epoxy layer to prevent magnetic dilution; in addition TiO2 nanoparticles are added to enhance the mechanical durability of the coating layer. In the hybrid coating layer with optimal composition, the decrease in magnetic permeability and saturation magnetization is suppressed.
        4,000원
        12.
        2020.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The removal of organic carbon and nutrients (i.e. N and P) from wastewater is essential for the protection of the water environment. Especially, nitrogen compounds cause eutrophication in the water environment, resulting in bad water quality. Conventional nitrogen removal systems require high aeration costs and additional organic carbon. Microbial electrochemical system (MES) is a sustainable environmental system that treats wastewater and produces energy or valuable chemicals by using microbial electrochemical reaction. Innovative and cost-effective nitrogen removal is feasible by using MESs and increasing attention has been given to the MES development. In this review, recent trends of MESs for nitrogen removal and their mechanism were conclusively reviewed and future research outlooks were also introduced.
        4,300원
        14.
        2016.04 구독 인증기관·개인회원 무료
        This study investigated the Texture Profile Analysis and Sensory characteristics analysis of 6 different Pork Meat-substituted Soybean Curd (PMSC) products with different gluten-fiber (GF) contentst. PMSC types were PMSC-GF 5%, PMSC-GF 10%, PMSC-GF 15%, PMSC-GF 20%, PMSC-GF 25%, and PMSC-GF 30%. The lightness (ΔL value) of cooked PMSC was decreased, whereas the redness (Δa value) and yellowness (Δb value) of cooked PMSC was not changed. Texturometer (TA XT Plus, England) was used for objective test and hardness, springiness, cohesiveness and chewiness of sensory characteristics were measured. PMSC with GF 5% to 15% were characterized high hardness score but PMSC with GF 20% to 30% were not significantly different. PMSC-GF 30% was the highest score in springiness and PMSC-GF 5% was the lowest. PMSC-GF 25% and 30% were high cohesiveness score but was not significantly different (p<0.05). Fourteen sensory descriptors were developed to evaluate the sensory characteristics of PMSC. The sensory characteristics of PMSC were sweetness, saltiness, springiness, hardness, chewiness, meat flavor, odor, loose particle and so on. Six different PMSC showed no significant difference in the attributes of loose particle. But PMSC-GF 5% and PMSC-GF 10% showed significant difference in the attributes of hardness. PMSC-GF 25% and PMSC-GF 30% showed no significant difference in the attributes of hardness. PMSC-GF 30% was the highest springiness score and PMSC-GF 5%, PMSC-GF 10% and PMSC-GF 15% showed no significant difference in the attributes of springiness. Overall consumer acceptance was surveyed. PMSC-GF 5%, PMSC-GF 10% and PMSC-GF 15% showed no significant difference in the attributes of color. PMSC-GF 25% and PMSC-GF 30% was the highest in the attributes of springiness and high moistureness, taste acceptance and overall acceptance. PMSC-GF 5%, PMSC-GF 10% and PMSC-GF 15% showed no significant difference in overall consumer preference but PMSC-GF 25% and PMSCGF 30% showed significant difference. Consequently it is indicated that texture of cooked PMSC-GF 25% and PMSC-GF 30% is very important sensory characteristics.
        15.
        2016.04 구독 인증기관·개인회원 무료
        This study tested a hypothesis that the bacterial immunosuppresants enhance BtI susceptibility of two mosquitoes, the forest mosquito (Aedes albopictus) and the house mosquito (Culex pipiens pallens). Three symbiotic bacteria Xenorhabdus nematophila (Xn), X. hominickii (Xh), and Photorhabdus temperata subsp. temperata (Ptt) were isolated from their symbiotic nematodes and cultured in nutrient broth to allow them to produce the secondary metabolites. BtI gave significant toxicities to A. albopictus and C. pipiens pallens larvae: 50% of lethal concentration to be 2.9 × 105 spores/mL and 2.2 × 105 spores/mL at 16 h after treatment, respectively. Addition of each bacteria-cultured broth significantly enhanced BtI toxicity to the mosquito larvae by lowering LC50 values of BtI to A. albopictus larvae (1.5 × 105 to Xn, 1.7 × 105 to Xh, and 1.9 × 105 to Ptt, respectively) and to C. pipiens pallens larvae (1.2 × 105 to Xn, 1.3 × 105 to Xh, and 1.5 × 105 to Ptt, respectively). Based on these results, we developed a new mosquitocidal Bt formulation called ‘Dip-Kill’, which consisted of 80% Xn-cultured broth, 10% BtI (1010 spores/mL), and 10% preservative. Only 400 ppm of Dip-Kill showed 100% mortality to fourth instar larvae of A. albopictus and C. pipiens pallens 16 h after treatment.
        16.
        2015.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        아키텍처 혁신은 급진적 혁신과 달리 기술적 불연속성의 정도는 낮지만 제품 아키텍처의 변경을 통한 기술적 성능개선 폭은 큰 혁신으로 이해되고 있다. 신생 산업의 초 기, 급진적 혁신 제품의 개발에 성공한 기업은 이후, 열등한 아키텍처 효율성 문제를 극복하 지 않으면 더 이상 기술적 성능 개선이 둔화되는 시점에 도달하게 된다. 이 지점에서는 급진 적 혁신 단계에서의 열등하지만 창의성이 깃든 제품 아키텍처의 창출 경험은 오히려 아키텍 처 혁신의 장애물로 작용하게 될 수 있다. 본 연구는 아키텍처 혁신 전후의 시장 요구변화와 이에 대한 기술적 해결 전략을 단계모델의 관점과 문제해결 모델의 관점이 결합된 분석틀의 구축을 통해 이해해보고자 하였다. 한국의 중소기업 자화전자(주)는 산업 초창기 휴대폰에 장착되는 진동모터의 급진적 혁신에 성공 후 아키텍처 혁신과 연관된 장애물들을 극복함으로써 마침내 자신이 개발한 진동모터의 본격적 확산에 성공할 수 있었다. 본 연구는 진동모 터의 개발과정에 대한 능동적 참여관찰을 통해 단일 사례를 종단적으로 깊이 연구함으로서, 이 과정이 어떻게 진행되었는지를 이해하고자 하였다.
        9,500원
        17.
        2015.04 구독 인증기관·개인회원 무료
        Evolution of resistance to entomopathogenic bacterium, Bacillus thuringiensis (Bt), can potentially reduce the efficacy of insecticidal proteins from Bt to insect pests in fields. Bt resistance is involved in modification of the toxin binding to its specific midgut membrane receptors, such as cadherin, aminopeptidase N, alkaline phosphatase, and ABC transporters. The beet armyworm, Spodoptera exigua, is one of major lepidopteran insect pest in Korea and showed highly susceptible to Cry1Ca. We investigated the Cry1Ca toxicity with respect to its binding affinity to a Bt receptor, cadherin compared with Cry1Ac. RNA interference (RNAi) of a cadherin of S. exigua (SeCad1) significantly suppressed the Cry1Ca to the toxic level of Cry1Ac. Binding affinity of Cry1Ca to brush border membrane vesicle (BBMV) of S. exigua midgut was significantly lost after SeCad1 RNAi. Binding affinity of Cry1Ac to BBMV was much low compared to that of Cry1Ca and less sensitive to SeCad1 RNAi. Direct binding assay of Cry toxins to SeCad1 was assessed using a recombinant cadherin repeat 10-11 (rCR10-11) of SeCad1. The addition to rCR10-11 to Cry1Ca significantly enhanced the toxicity under SeCad1 RNAi. However, the synergistic effect of rCR10-11 on toxicity of Cry1Ac was not much significant with poor binding affinity of Cry1Ac compared to Cry1Ca. These results indicate that the differential toxicity of Cry toxins against S. exigua is caused by the different affinities to the Bt receptor, cadherin.
        18.
        2014.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Biofouling in brackish water reverse osmosis (RO) membranes still needs extensive research to understand cause and mechanism and to obtain methods for reduction of its impact on RO applications. Natural compounds with biofilm formation inhibitory properties are being investigated. Two compounds, vanillin and Epigallocatechin gallate (EGCG), were selected due to their great potential on biofilm formation inhibition. Vanillin shows inhibition on quorum sensing mechanisms of biofilm formation. EGCG has potential to inactivate microbial activity. The two compounds were incorporated in typical polyamide reverse osmosis membranes and evaluated on flux behaviours and biofilm formation potential. The surface properties of membrane coated with vanillin were changed tremendously compared to those with EGCG. As a result, the flux was reduced substantially. The biofilm formation seems hindered with EGCG coated membranes compared to the virgin membranes. More research is needed to optimize coating methods applicable to RO membranes and to enhance biofouling reduction.
        4,200원
        19.
        2014.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        자동취수 물꼬와 토사유출저감 물꼬의 현장 적용성을 평가하기 위하여 2012년부터 2013년까지 2년 동안 취수량, 배출수량, 수질농도변화 그리고 생육 및 생산성을 조사하여 얻은 결과는 다음과 같다. 1. 관행 물꼬 관리 논과 자동취수 물꼬관리 논의 취수량은 각각 1,634 mm/yr와 922 mm/yr로 관측되었으며, 43.6%의 절약효과가 산정되어 용수량 절약에 효과적인 것으로 나타났다. 2. 자동취수 물꼬를 설치한 논의 배출수량이 관행 물꼬 관리 논에 비하여 38.6% 감소하였다. 3. 토사유출저감 물꼬를 설치한 논에서 SS는 22.8 ~ 75.0%, COD는 9.7 ~ 45.5%, TN은 0 ~ 64.5%, TP는 0 ~ 42.5%의 농도 개선효과가 있는 것으로 나타났다. 4. 개선된 물꼬 관리 논과 관행 물꼬 관리 논의 벼 생육과 생산량은 큰 차이가 없는 것으로 조사되었다. 이러한 연구결과로 볼 때 자동취수 물꼬와 토사유출저감 물꼬를 이용한 논의 물꼬 관리 시스템 개선은 생산량을 유지하며 수자원 및 물 환경을 보전하기 위한 좋은 시설로 판단된다.
        4,000원
        20.
        2014.10 구독 인증기관·개인회원 무료
        Six of cadherins have been selected from the P. xylostella genome 52 open reading frames are annotated as cadherin-like genes. Compared to other 5 cadherins of P. xylostella (PxCads), PxCad1 has the highest homology with other lepidopteran insect cadherins and PxCad1 was expressed in all developmental stages specially in gut tissue. Expression of PxCad1 was suppressed by feeding its specific double-stranded RNA (dsRNA, 150ng/larva) and treatment of dsPxCad1 significantly reduced susceptibility to Bt Cry1Ac toxin. To confirm the specific interaction between PxCad1 and Cry1Ac, a toxin-binding assay was performed using enzyme-linked immunosorbent assay (ELISA). The ELISA indicates that BBMV extracted from PxCad1-silenced P. xylostella have significantly lower binding activity to active form of Cry1Ac than control BBMV. Moreover, the analysis of the binding parameters showed that the toxin affinity (Kd) of the control BBMV extract (BBMV-dsCON) was 6.08 ± 0.84 nM, which was not much different to the affinity value (6.72 ± 0.81 nM) of the dsPxCad1 treatment. However, there was a remarkable difference in number of binding sites (Bmax), in which BBMV-dsCON extract had 1.61 ± 0.04, but the BBMV-dsPxCad1 extract had 0.88 ± 0.02. Taken together, these results are suggest that PxCad1 is a functional receptor for Cry1Ac toxicity against P. xylostella larva.
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