결과 내 재검색





        검색결과 41

        2022.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Black carbon (BC), which is mainly contained in fine particulate matters, is one of the typical anthropogenic air pollutants that are generated from the incomplete combustion process and discharged into the atmosphere, and its various health effects particularly on children have been a growing concern. In this study, BC and particulate matters were closely analyzed in an elementary school adjacent to a high- traffic road in a large metropolitan city. The investigation showed that black carbon behaved similarly to ultrafine dust of 0.3 μm or less in the air, accounting for 20%-40% of it. The occurrence of high concentration outdoor pollution influences the BC content in indoor particulate matters. The average I/O value was 0.7 during the class-hours, and 0.8 without students. However, when students played in the classroom, the range of BC concentrations varied from 0.25 to 1.15, wider than 0.41-1.13 without students. Although this study was conducted with regard to just one elementary school, it can be considered to represent the typical air quality status of domestic schools, and it is believed to present valuable data which can be utilized to assist with preparing measures to enhance the air quality management of schools.
        2021.09 KCI 등재 구독 인증기관 무료, 개인회원 유료
        케냐에서 토종 닭의 낮은 생산성은 부분적으로 열악한 관리 관행, 특히 적절한 건강 관리, 열악한 사육장 및 영양 부족 때문으로 알려져 있다. 이 연구의 목표는 케냐에서 산란계를 위한 신배합사료 배합 가능성 확인과 신배합사료 식 A와 B의 급이를 통한 계란 생산성을 분석하고자 하였다. 1. 2018년 7월 1일부터 2021년 3월 31일까지 Embu 및 Tharaka Nithi 카운티에서 닭 생산에 관심이 있는 농부 그룹을 선정하였다. 농부 그룹 선정에 사용 된 기준은 닭의 수, 닭 사육 및 장비에 대한 투자 수준, 사료 혼합에 대한 관심, 농가 집단의 응집력, 교육 수준 및 집단 구성원의 연령 등 이었다. 2. 총 3,968명의 농업인이 산란계를 위한 신배합사료 식 A와 B에 따른 사료조제 및 이용에 참여하였으며, 총 136,683 kg의 배합 사료를 조제하였다. Embu 지역에서는 2,774명의 농업인이 53,770 kg을, Tharaka Nithi 지역에서는 1,194명의 농업인이 41,313 kg의 신배합사료를 각각 조제하였다. 3. 신배합사료 식 A와 식 B가 케냐 표준 국 [KEBS] (2014)의 품질 표준을 충족하는지 평가하기 위해 사료 영양 성분을 분석한 결과, 신배합사료 식 A와 식 B, 상업용 사료 모 두 건물중(dry matter) 이 88%이상으로 표준을 충족 하였고, 최대 25% 이하의 회분(ash), 15% 이상의 조단백질(crude protein) 과 7.5% 이하의 조섬유(crude fiber) 기준과 대부분 부합하였다. 4. 신배합사료 식 A와 시판용 사료를 급여한 산란계 10마리의 일일 평균 계란 생산량을 비교한 결과 Embu 지역에서는 7.2개와 5.1개, 그리고 Tharaka Nithi 지역에서는 8.2개와 5.7 개로 유의적으로 높은 생산성 차이가 확인되었다. 5. 신배합사료 식 B와 시판용 사료를 급여한 산란계 10마리의 일일 평균 계란 생산량을 비교한 결과 Embu 지역에서는 7.3개와 4.9개, 그리고 Tharaka Nithi 지역에서는 7.1개와 5.2 개로 유의적으로 높은 생산성 차이가 확인되었다.
        2021.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        토종닭의 중요성은 대부분의 농업인 단체에서 자원이 부족한 농업인들을 위한 중요한 사업으로 인식되면서 수년에 걸쳐 증가하고 있다. 그러나 이러한 사업은 낮은 수익률과 비경제적인 문제에 직면 해 있다. 케냐 농축산 연구기구(KALRO) 의 이전 기구이었던 케냐 케냐농업연구기구(KARI)는 토종 닭의 생산성 향상을위한 연구에 앞장서 왔다. KARI의 개량 닭 사양관리 기술은 생산성 저하 문제를 줄이기 위한 연구를 수행 하였다. KALRO는 KOPIA 프로젝트를 통해 지난 5년 동안 Machakos와 Kiambu County의 두 모델 마을에서 기술 이전을 추진 하였다. 본 연구는 KARI의 개량 닭이 식량과 가구 소득에 미치는 영향을 평가하기 위해 수행되었다. 두 카운티 모두 입식률이 2008년 2%에서 증가했으며, 2016년 Machakos County의 시범마을 참여 농업인의 59%와 Kiambu 에서 39%가 입식 한 최고치를 기록하였다. 그러나 병아리 입식은 2017년에 감소하다 다시 2018년에 증가하기 시작하였다. 두 카운티에서 2018 년에 판매 된 계란의 수는 Kiambu카운티에 서 230% 증가하였고, Machakos카운티 시범마을에서는 한 달에 가장 높은 963% 증가를 기록하면서 크게 증가하였다. 이는 주로 연간 180~250개의 알을 낳는 KALRO 개량 닭의 도입에 기인하였다. 이것은 계란 생산과 판매로 식량 및 가구 소득 증가로 이어졌습니다. 이 결과는 KARI 개량 닭이 가정의 식량과 소득 안정에 긍정적인 영향을 미쳤음을 보여주었다.
        2021.05 구독 인증기관 무료, 개인회원 유료
        In defense acquisition system, testing and evaluation is a very important procedure that can ensure the completeness of capability while deciding whether to mass-produce or purchase weapons systems. But it always includes realistic restrictions that involve a variety of stakeholders, but lack of time, resources, and budget. Therefore, in the process of planning a test and evaluation, proper number of prototypes and reliability of test results, along with test items and evaluation criteria, are frequently discussed as sensitive agendas. In reality, however, rather than statistical judgments, the number of prototypes and tests are determined by business logic such as duration and budget. Otherwise, most theoretical studies do not adequately reflect the business logic of test assessment. In this study, we propose a number of prototype and tests method that can statistically reasonably verify the performance of the inorganic system considering the characteristics of each test and evaluation project. To this end, we consider the theory related to determining the number of prototypes and tests, and present examples by separating whether to secure the magnitude of effects that have a significant impact on statistical judgment. This study could contribute to the development of empirical methodologies that can adequately coordinate reality and theory in the field of defense test evaluation while ensuring statistical reliability of test evaluation results.
        2020.04 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Recently, home workout has attracted attention as it can be done easily and conveniently at home. Accordingly, many types of home workout equipment are produced but, these kinds of exercise equipment using dumbbells or weights are too heavy to use for at-home-workout and they are too bulky in size. This paper studies a form of exercise done at home which is using a motor instead of dumbbells and weights that are originally used in the exercise equipment. DAFUL, a multi-body dynamics analysis program, is used to verify the dynamic performance of the proposed equipment. Therefore, motor-based exercise equipment is expected to be smaller than existing exercise equipment and more suitable for use at home.
        2019.10 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The results of internal temperature. productivity and immunity analysis of the laying hen house by the thermal environment and the supply of cold drinking water were as follows. The external temperature was changed from the minimum of 18℃ at night and the maximum of 36℃ during the day, and the internal temperature of the laying hens varied from 20~31℃. Thermal imaging analysis showed that the body temperature of the laying hen decreased by 2.4℃ with the supply of drinking water. The laying hen amount increased 2.36g and laying hen rate increased 3.62%p. Albumin increased 6.1%, decreased AST 15%, and decreased cholesterol 12.7%. Immune activators increased and T cells and B cells increased to increase immunity.
        2019.07 KCI 등재 구독 인증기관 무료, 개인회원 유료
        With the recent accelerated policy-making and interests in new renewable energy, plans to develop and supply the new renewable energy have been devised across multiple regions in Korea. Solar energy, in particular, is being applied to small-scale power supply in provincial areas, as solar cells are used to convert solar energy into electric energy to produce electric power. Nonetheless, in the case of solar power plants, the need for a large stretch of land and considerable sum of financial support implies that the planning step should take into consideration the most suitable meteorological and geographical factors. In this study, the proxy variables of meteorological and geographical factors associated with solar energy were considered in analyzing the vulnerable areas regarding the photovoltaic power generation facility across the nation. GIS was used in the spatial analysis to develop a map for assessing the optimal location for photovoltaic power generation facility. The final vulnerability map developed in this study did not reveal any areas that exhibit vulnerability level 5 (very high) or 1 (very low). Jeollanam-do showed the largest value of vulnerability level 4 (high), while a large value of vulnerability level 3 (moderate) was shown by several administrative districts including Gwangju metropolitan city, Jeollabuk-do, Chungcheongbuk-do, and Gangwon- do. A value of vulnerability level 2 (low) was shown by the metropolitan cities including Daegu, Ulsan, and Incheon. When the 30 currently operating solar power plants were compared and reviewed, most were found to be in an area of vulnerability level 2 or 3, indicating that the locations were relatively suitable for solar energy. However, the limited data quantity for solar power plants, which is the limitation of this study, prevents the accuracy of the findings to be clearly established. Nevertheless, the significance of this study lies in that an attempt has been made to assess the vulnerability map for photovoltaic power generation facility targeting various regions across the nation, through the use of the GIS-based spatial analysis technique that takes into account the diverse meteorological and geographical factors. Furthermore, by presenting the data obtained for all regions across the nation, the findings of this study are likely to prove useful as the basic data in fields related to the photovoltaic power generation.
        2019.01 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Experiments of local cooling and heating on crown and root zone of forcing cultivation of strawberry ‘Seolhyang’ using heat pump and root pruning before planting were conducted. During the daytime, the crown surface temperature of the crown local cooling treatment was maintained at 18 ~ 22oC. This is suitable for flower differentiation, while those of control and root zone local cooling treatment were above 30oC. Budding rate of first flower clusters and initial yields were in the order of crown local cooling, root zone local cooling and control in root pruning plantlet and non pruning plantlet, except for purchase plantlet. Those of root pruning plantlet were higher than those of non pruning plantlet. These trends were evident in the yield of the first flower cluster until February 14, 2018, and the effect of local cooling and root pruning decreased from March 9, 2018. The budding rates of the second flower cluster according to the local cooling and root pruning treatments were not noticeable compared to first flower cluster but showed the same tendency as that of first flower cluster. In the heating experiment, root zone local heating(root zone 20oC+inside greenhouse 5oC) and crown local heating(crown 20oC+inside greenhouse 5oC) saved 59% and 65% of heating fuel, respectively, compared to control(inside greenhouse 9oC). Considering the electric power consumption according to the heat pump operation, the heating costs were reduced by 55% and 61%, respectively.
        2018.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The drinking water supply system applicable to the laying hen consists of air-water heat pumps, drinking water tanks, heat stroage tank, circulation pumps, PE pipes, nipples, and control panels. When the heat pump system has power of 7.7 to 8.7 kW per hour, the performance coefficient is between 3.1 and 3.5. The supply temperature from the heat pump to the heat stroage tank was stabilized at about 12±1°C, but the return temperature showed a variation of from 8 to 14°C. Stratified temperature in the storage tank appeared at 12.°C, 13.5°C and 14.4°C, respectively. The drinking water supply temperature remained set at 15°C and 25°C, and the conventional tap water showed a variation for 23°C to 30°C. As chickens grow older, the amount of food intake and drinking water increased. y = -0.0563x2 + 4.7383x + 8.743, R2 = 0.98 and the feed intake showed y = -0.1013x2 + 8.5611x. In the future, further studies will need to figure out the cooling effect on heat stress of livestock.
        2018.04 KCI 등재 구독 인증기관 무료, 개인회원 유료
        In order to effectively utilize thermal energy, we analyzed the performance of the high efficiency latent heat storage system which can be used for greenhouse heating by using the developed phase change material. The system consists of hot water boiler, heat storage material, heat storage box, heat storage tank, circulation pump, control panel, and storage material. As a result, the latent heat and latent heat temperature of sodium acetate hydrate as latent heat storage material are 231.6 ~ 264.8kJ/kg, 54.95 ~ 55.48℃. As the number of cooling and heating increased, the latent heat temperature showed a slight change, but the latent heat decreased 33.1kJ/kg as the number of repetition increased. In the case of sodium acetate hydrate, large supercooling phenomenon was observed, and it was found that mixing of additives such as nucleating agent, thickener and supercooling agent can control the supercooling more effectively. The consumption of kerosene decreased until the temperature of the heat storage tank was raised to the set temperature by the closed circuit for 4 hours in the initial stage of the boiler operation. The heat exchange rate according to the change of the flow rate was maintained at the set temperature inside the heat storage tank after 4 hours of operation, Consumption was high. As the flow rate increased, the inlet and outlet temperature difference decreased, the heat exchange rate increased, and the heat exchange efficiency was in the range of 57.4 ~ 60.5%.
        2018.01 KCI 등재 구독 인증기관 무료, 개인회원 유료
        본 연구에서는 풍환경에 따른 열손실을 분석하는데 있어 필요한 풍속 기초자료를 제공하기 위하여 주요 11개 해안지역 중 온실밀집지역을 선정하여 기상환경 및 온실 방위를 조사 분석하였다. 대상지역은 난방온실 재배면적과 풍환경 기준으로 선정하였고 온실밀집지역은 50,000m2 이상인 지역을 대상으로 하였다. 11곳의 기상자료 중 기온,풍속, 풍향을 대상으로 30년간 자료를 수집하여 분석하였고 기온은 최저, 평균, 최고 기온을 나누고 풍속 및 풍향 기준은 기상청 분석 기준을 적용하였다. 온실의 배치방향은 형태가 대칭인 점을 감안하여 0~180o 범위로 자료를 수집하였다. 또한, 각 지역마다 풍향이 있으며 온실길이방향을 기준으로 하였을 때 적용되는 풍향은 달라질 수 있으며 이를 상대풍향으로 지칭하고 중복되는 점을 고려하여 0~90o 범위로 자료를 수집하였다. 11개 지역의 기온은 중부지방에 있는 보령, 영광 지역과 남부지방에 있는 9개 지역의 기온차이가 구분되었다. 중부해안 대상지역은 1월 최저기온은 약 3~4oC 정도 온 도가 높은 것을 확인할 수 있었고 평균기온은 약 3oC 정도 높았으며 월별 기온 중 최저기온을 선정할 때에 1 월 기온을 고려해야 되는 것으로 판단된다. 대상지역의 주풍향에 대한 월별 차이는 크게 발생하지 않았으며 풍향 분포에 따라 지역별로 서해안측, 서해 및 남해 경계 해안측, 남해안측으로 구분되어졌다. 풍속은 영광을 제외 한 10개 지역은 월간 풍속 포차이가 크게 발생하지 않는 것으로 판단된다. 대상지역의 온실의 방향은 길이방향 기준으로 분석하였으며 보령과 영광, 남해 지역은 60%이상 집중되어 있는 방향이 존재하였고 해남, 통영 지역은 약 90% 집중되어있는 방향이 존재하였으며 이는 경지정리로 인하여 방향이 편향되어있는 지역이 존재하는 것으로 판단된다.
        2017.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        쓰레기 소각장이나 산업체의 폐열을 농업에 활용한 사례는 몇몇 있었다. 그러나 온배수를 농업에 활용한 사례는 전무하였으며, 치어, 종패 등을 양식하는 수산업이 대부분이었다. 본 연구에서는 화력발전소의 온배수(폐열)를 열원으로 이용하는 120 RT 규모의 냉난방시스템을 제주특별자치도 서귀포시 안덕면 소재의 5,280m2 아열대 작물(망고) 재배 온실에 설치, 10월에서 다음해 2월까지 약 5개월 동안 난방을 실시하여 난방에너지 비용 절감 효과 등 분석하였다. 난방에너지 비용 절감효과는 면세경유에 대하여 87%이였으며, 또한 발전소의 온배수를 에너지원으로 재활용함으로 서 62%의 이산화탄소 배출 저감 효과를 얻었다. 본 연구를 계기로 2015년에 해수가 수열에너지 분야로 재생에너지에 포함되었다. 해수의 표층의 열을 히트펌프를 사용하여 변환시켜 얻은 에너지라는 수열에너지 분야의 기준과 범위를 볼 때, 이는 온배수가 재생에너지에 포함되었다고 말해도 과언이 아닐 것으로 사료된다. 그 이유는 온배수도 해수임에도 불구하고 온도가 일반 해수 보다 7~8oC 높아, 일반 해수를 히트펌프의 열원으로 이용하는 것보다 온배수를 열원으로 이용했을 때 히트펌프의 성능이 높기 때문이다. 또한 같은 해 농식품부의 폐열 재이용 시설 지원 사업이 발표되어, 발전소 온배수뿐만 아니라 산업체와 소각장의 폐열을 농업에 활용하면 지원을 받을 수 있게 되었다. 이 사업에 의하여 2015년 당진시, 하동군, 제주시, 곡성군이 선정되었으며, 2016년 태안군, 서귀포시 등이 선정되어, 2016년 말 곡성군과 제주시가 공사를 완료, 농업에 폐열을 활용하고 있으며(제주시는 발전소, 곡성군은 산업체 폐열을 이용하고 있음), 기타 지역은 추진 중이다.
        2016.06 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The Agriculture, Forestry and Fisheries Research Council within the Ministry of Agriculture, Forestry and Fisheries looks over the Agriculture, Forestry, and Fisheries Research and Development Project. Every five years, it revises the Agriculture, Forestry and Fisheries Research Basic Plan. Based on the information above, the following suggestions are made to implement domestic research projects. First, the strategic planning and promotion of research and development projects are needed to achieve the goals of the country and agricultural policy. Second, it is necessary to break up and diversify research assignments so that the project implementation reflects the trend of the time. Third, there is a need to develop a research partnership that strengthens cooperation among industry, academia, government, and research institutes to utilize technology seeds from fields other than agriculture. Fourth, it is necessary to improve field demonstration research projects where central and local research institutes, universities, private companies, agricultural cooperation, and farmers can participate. Fifth, follow-ups should be conducted at the end of research to advance research implementation systems. Finally, there is a need to build a new dissemination system which includes research results and policy.
        2016.03 KCI 등재 구독 인증기관 무료, 개인회원 유료
        The Japanese government, on the basis of the Food, Agriculture and Rural Areas Basic Act, announced the 4th Basic Plan for Food, Agriculture and Rural areas, at the same time the third Basic Plan for Agriculture, Forestry and Fisheries Research in March 2015. The Basic Plan is configured as improvement of food self-sufficiency rate, a stable food supply, agricultural maintenance and development, rural promotion. The new target for the calorie-based food self-sufficiency ratio has been lowered from the previous 50 percent by 2020 to 45 percent by 2025. The production target for table rice has been lowered, but production targets for rice for flour and rice for feed have been raised significantly - five times and 10 times the more than current production by 2025, respectively. The 4th Basic Plan included the important measures of 24 and the details practice challenges of 50 should be intensively promoted for the next five years. The new Research Basic Plan set 21 key targets research and development to solve problems promptly faced by producers with the aim of increasing income in agriculture and rural communities and 11 priority targets research and development to be steadily promoted under medium- to long-term strategy. In addition, it announced the necessary measures of 10 at three areas in order to promote more efficiency and effective in the Agriculture, Forestry and Fisheries Research. In Korea, it refers to the announcement contents of Japan where there is a need to formulate a development plan for Agriculture, Rural Areas and Food Industry Development Plan that meets the Korean situation.
        2013.11 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Melamine has been reported to be responsible for kidney stones and renal failure among infants and children. Con-ventional detection methods, High-Performance Liquid Chromatography (HPLC) and Gas Chromatography (GC), aresensitive enough to detect trace amounts of the contaminant, but they are time consuming, expensive, and labor-intensive. Hyperspectral imaging methods, which combine spectroscopy and imaging, can provide rapid and non-destructive means to assess the quality and safety of agricultural products. In this study, near-infrared hyperspectralreflectance imaging combined with partial least square regression analysis was used to predict melamine particleconcentration in dry milk powder. Melamine particles, with concentration levels ranging from 0.02% to 1% byweight ratio (g/g), were mixed with dry milk powder and used for the experiment. Hyperspectral reflectance imagesin the wavelength range from 992.0nm to 1682.1nm were acquired for the mixtures. Then PLSR models weredeveloped with several preprocessing methods. Optimal wavelength bands were selected from 1454.5nm to 1555.6nm using beta-coefficients from the PLSR model. The best PLSR result for predicting melamine concentration inmilk powder was obtained using a 1st order derivative pretreatment with Rv=0.974, SEP=±0.055%, and F=6.
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