• 한국환경농학회지
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• 제13권2호
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• pp.151-159
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• 1994

본 연구는 음용수로 사용하고 있는 지하수를 대상으로 양돈시설이 밀집해 있는 서북부지역의 19개 관정과 동북부지역의 9개 관정의 지하수를 채취하여 지역간 $NO_3-N$ 농도의 차이, $NO_3-N$과 다른 이온과의 관계, 각 이온간의 관계 및 이온조성의 차이를 밝히기 위하여 수행되었다. 서북부 지역에서 양돈단지 주변의 D-41과 D-202 관정의 $NO_3-N$ 농도는 10.95 및 13.1mg/l로서 음용수 수질 기준을 초과하였으며, D-65, D-35 및 D-120 관정에서의 농도는 음용수 수질기준에 비하여 약간 낮았다. 동북부 지역의 지하수중 농도는 대부분 3mg/l 이하였다. 서북부 지역에서 pH는 Ca, Mg 및 EC와 역의 상관관계가 있었으나, 동북부 지역에서는 상관성이 없었으며, 두 지역에서 모두 Ca, Mg, Na 및 $SO_4$간에는 정의 상관성을 나타내었다. 서북부 지역에서 $NO_3-N$은 pH와 역의 상관관계가 있었으며, Ca, Mg, Na, Cl, $SO_4$ 및 Cl/$HCO_3$와 정의 상관성을 나타내었으나, 동북부 지역에서는 상관성을 나타내지 않았다. D-65, D-35 및 D-41 관정의 이온조성은 인위적인 오염의 정도가 낮은 D-42 판정에 비하여 Ca, Mg, Na, Cl 및 $SO_4$가 높은 편이었다. 이와 같은 결과는 서북부 지역의 지하수가 양돈폐수에 의하여 영향을 받아 폐수중의 성분이 지하수로 유입되었기 때문에 나타난 결과라고 추정된다.

• 한국토양비료학회지
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• 제33권3호
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• pp.193-204
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• 2000

과학적 근거에 기초한 Codex등 국제유기농업 규정과 달리, 유기독농가들의 경험축적에 주로 근거하는 한국 토착유기농업의 토양비옥도 유지증진책에 대한 환경보전 기능을 토양비료학적인 측면에서 검토하는데 목적을 두고 팔당 상수원보호구역에서 유기농법을 실시하는 100농가를 대상으로 토양 화학적 특성을 분석하였다. 표토층의 EC는 배추 $2.30dS\;m^{-1}$, 상추 $2.29dS\;m^{-1}$, 쑥갓 $1.83dS\;m^{-1}$ 등으로, 적정범위인 $2.00dS\;m^{-1}$를 초과하는 농가의 42%가 작물재배에 부적절한 염류집적정도를 나타내었고, 총탄소함량은 표토층 $74g\;kg^{-1}$, 심토층 $52g\;kg^{-1}$로서, 적정범위 $20{\sim}30g\;kg^{-1}$에 비하여 2~4배 가량 높았는데, 이는 토착유기농법이 지력향상을 위해 유기질비료를 과다 시용한 때문이다. 표토층과 심토층에서의 질산태질소 함량은 배추 $82mg\;kg^{-1}$과 $75mg\;kg^{-1}$, 상추 $86mg\;kg^{-1}$과 $72mg\;kg^{-1}$, 쑥갓 $66mg\;kg^{-1}$과 $42mg\;kg^{-1}$으로, 유기농가 포장의 질산태질소 함량이 관행농가 포장에 비해 4~7배나 높다는 것과 표토층으로 부터 서서히 심토층으로 질산태질소가 용탈되고 있음을 보여주고 있어 지하수와 하천의 오염 가능성을 배제할 수 없었다. 유효인산 함량은 배추의 경우 표토층과 심토층에서 $918mg\;kg^{-1}$과 $641mg\;kg^{-1}$, 상추 $954mg\;kg^{-1}$과 $466mg\;kg^{-1}$, 쑥갓 $1114mg\;kg^{-1}$과 $873mg\;kg^{-1}$ 등으로, 관행농업 재배지에 비해 약 2배 정도 높았다. 특히 퇴비에 함유된 인산은 대개 수용성인 피틴태이므로 과다 집적된 인산은 점차 지하로 용탈되거나 강우시 유거수와 함께 이동되어 비점오염원의 하나로 하천이나 상수원을 오염시킬 우려가 크다고 볼 수 있다. 이상의 결과는 유기질비료에만 의존하는 한국 토착유기농법의 토양비옥도 증진책에 의한 질산태질소, 인산염, 염류집적 등으로 토양오염 현상이 심각함과, 한국토착유기농업 실천농가포장에서 질산태질소와 인산염에 의한 지하수 수질오염 위험성을 나타냈다.

• 한국실내디자인학회논문집
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• 제15호
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• pp.39-48
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• 1998

This study has been peformed to investigate storage space types of old-fashioned traditional dwelling units where older couples maintain their traditional farming lives. In this study it is observed that residents of the traditional farm-houses are exposed to higher level of environmental and emotional pressures. However it is also observed that the older residents are generally manifesting a consistent subculture of the old-timers without noticeable complaints. The usage and morphology of storage spaces are as follows: (1) Storage space in the ceiling are under control of old couple and used for seasonally varied farm products and household equipment. (3) All the households use longterm storage space under wooden floor; the hidden ground is used for keeping miscellaneous tools and fermented foods for years. Overall in this stud it is observed that traditional farm houses are well modified for physically and emotionally frail elderly residents.

• Journal of Biosystems Engineering
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• 제18권3호
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• pp.191-198
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• 1993

Vertical and horizontal ride vibrations of the selected agricultural tractors were measured and evaluated with respect to the ISO 2631 'guide for the evaluation of human exposure to whole body vibration'. Evaluation showed that at the normal transportation speeds of 1.4~20km/h on both the concret and ground surfaces tractor drivers were exposed to the vibrations whose magnitudes exceed the 8 hour fatigue decreased proficiency boundary in the frequency ranges of 2~16Hz in vertical and 1~2Hz in horizontal directions. Considering that tractor operation becomes as one of the specialized job for the future farming in Korea, measures must be made to protect the drivers against harmful ride vibrations of agricultural tractors.

• Journal of Dairy Science and Biotechnology
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• 제23권1호
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• pp.49-63
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• 2005

China that holds various and plentiful food resources had little growth in dairy industry compared with her long history. But after the establishment the People's Republic of China, It began to activate. Because of the economic growth and the improvement of living standard of China, dairy products were becoming common food, so Chinese dairy industry was considering as a industry which accomplishes a rapid growth. On the ground of a sudden economic growth, the progress of income level of China and the open economy, the world dairy industry was concerned about the Chinese market, so, the Chinese dairy industry would bring an exorbitant change in the world dairy industry. Therefore, We Korean dairy industry must make inroads into the Chinese market by making a royalty profit through the transfer of technical know-how and the export of dairy products.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.447-449
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• 2003

Remotely sensed data can be used to estimate biomass production using methodologies relating vegetation indices to light absorption or to leaf photosynthetic capacity. The considerations of both light absorption and photosynthetic capacity in remote sensing-based modeling to estimate biomass production or NPP was introduced based upon Monteith model NPP is one of a evaluation of land degradation. NPP was estimated from annual maximum NDVI by MODIS data. It was known that NPP of the grassland that except the forest and the farming ground was distributed between 50-200g /m2.

• Journal of Biosystems Engineering
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• 제36권2호
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• pp.116-121
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• 2011

This study was conducted to develop a robust navigator which could be in positioning for precision farming through developing a plural GPS receiver with 4 sets of GPS antenna. In order to improve positioning accuracy by integrating GPS signals received simultaneously, the algorithm for processing plural GPS signal effectively was designed. Performance of the algorithm was tested using a simulation program and a fixed point on WGS 84 coordinates. Results of this study are aummarized as followings. 1. 4 sets of lower grade GPS receiver and signals were integrated by kalman filter algorithm and geometric algorithm to increase positioning accuracy of the data. 2. Prototype was composed of 4 sets of GPS receiver and INS components. All Star which manufactured by CMC, gyro compass made by KVH, ground speed sensor and integration S/W based on RTOS(Real Time Operating System)were used. 3. Integration algorithm was simulated by developed program which could generate random position error less then 10 m and tested with the prototype at a fixed position. 4. When navigation data was integrated by geometrical correction and kalman filter algorithm, estimated positioning erros were less then 0.6 m and 1.0 m respectively in simulation and fixed position tests.

• 한국토양비료학회지
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• 제42권Spc호
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• pp.29-32
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• 2009

전통적으로, 한국의 벼생산 시스템은 곡물생산이라는 주목적 이외에, 지하수 함양, 장마기의 담수기능에 의한 홍수 방지 등 논농사가 가지는 다원적 기능이 주요한 특징으로 자리잡고 있다. 이러한 의미에서, 앞으로 다가올 기후변화에 대응한 새로운 작물생산 기술의 개발은 벼 생산 시스템의 다원적 기능과 IT, BT, NT를 융합한 체계로 나아가야 할 필요가 있다. 이와 같은 요구에 부응하기 위해서는 현재의 농업생산체계가 다음과 같은 새로운 파라다임으로 전환해야 할 것이다. 우선, 식량과 에너지를 생산하는 터전인 농경지의 중요성과 가치를 재인식하고 유지 보전 시켜야 할 것이다. 둘째, 농업생산 구조가 에너지 수지를 고려한 저탄소 녹색 농업체계로 전환하여야 할 것이다. 마지막으로 논 농업이 가진 공익적 기능을 새롭게 인식하고 이를 극대화시키는 자세 전환이 필요할 것이다.

• Journal of Biosystems Engineering
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• 제39권1호
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• pp.1-10
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• 2014

Purpose: This research was conducted to evaluate feasibility of a crank-type walking cultivators for weeding in furrowed upland. Methods: A walking cultivator developed by RDA was selected and evaluated with its working speed (S), cultivation depth (CD) and weeding performance (WP). The evaluation was performed in upland field on July and August, 2012. Also kinematic analysis of the machine was performed to draw out design improvements. Results: S in flat, uphill and downhill were about 0.11 m $s^{-1}$, 0.11 m $s^{-1}$, and 0.13 m $s^{-1}$ respectively. It was found that S had a low relevance with user conditions. The CD was 35 ~ 40 mm which was satisfied with the RDA guide for weeding machine. A wide variation was observed in values of WP depending on the growth stages of weeds and field conditions. The cultivator showed low performance in eliminating the well-grown weeds. Kinematic simulation revealed that high forward speed caused a high ratio of un-weeded area. Conclusions: The weeding performance of the cultivator was satisfactory for weeds in early growth stage but it showed difficulties in handling on up-slope and in entering up-land. Specifically, the weight of the cultivator was judged as overweight for female workers. The crank-hoe type cultivator was judged as unsuitable for small walking type machine due to weight of the four-bar linkage system. Kinematic analysis revealed that the ratio of crank speed to the ground speed must be 850 rpm s $m^{-1}$ (255 rpm based on 0.3 m $s^{-1}$) or greater to avoid uncultivated area. Selection of forward speed is a decisive factor in designing the weeding cultivator.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2016년도 학술발표회
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• pp.194-194
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• 2016

Gansu, located in the northwestern region, is a typical agricultural province of arid, semiarid in China. The shortage of water resources is the biggest obstacle of Gansu Province's development, and the dry farming water-saving is the eternal theme of Gansu agricultural sustainable development. In recent years, intensify reform in Gansu, has walked out a successful way in the agricultural water-saving. Using the integrated river basin governance as opportunity, the total water-using quantity was regarded as rigidity to retrain, distributed to counties (districts), irrigated areas, towns, associations, groups step by step. Agricultural water price was substantially increased, with the surface water price from about $0.1RMB/m^3$ to more than $0.2 RMB/m^3$, and the ground water from zero to more than $0.1RMB/m^3$. Simultaneously, the difference water prices and over-quota water progression price markup were carried out. The transaction of water rights was encouraged to impel the peasant to establish the consciousness of saving-water. The regulatory documents were formulated to standardize the scope, condition, mode, program etc. of agriculture water-rights transaction, to guarantees the transaction of water rights is carries out in order. The pattern of farming was optimized and adjusted, reducing the high water-consumption crop, increasing economic crops with high benefit and low water-consumption, developing industrialized agricultures such as green house. The relative engineering and measuring facility were comprehensively improved, with the anti-seepage of canal system and the enforcement of dynamo-electric well, developing high-efficient water-saving irrigation and overall metering facilities. The water fine-grained management has realized, and obvious water-saving effect has obtained: water-using rate in the irrigation area by river water has brought up to 0.57 from 0.52, and by well water up to 0.84 from 0.76. Although the water price has increased, the proportion that the water rate expenditure accounted for the cost lasts decline, and the farmers' income has gone up. The peasants express, the used water is few, and it is few to till land, but the income is many, and life is better.