• 한국조경학회지
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• 제30권1호
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• pp.1-10
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• 2002

The purpose of this article is to examine land use change in the fringe area of a metropolitan city through multi-temporal data analysis. Change detection has been regarded as one of the most important applications for utilization of remotely sensed imageries. Conventionally, two images were used for change detection, and Arithmetic calculators were generally used on the process. Meanwhile, multi-temporal change detection for a large number of images has been carried out. In this paper, a digital land-use map and three Landsat TM data were utilized for the multi-temporal change detection Each urban area map was extracted as a base map on the process of multi-temporal change detection. Each urban area map was converted to bit image by using boolean logic. Various urban change types could be obtained by stacking the urban area maps derived from the multi-temporal data using Geographic Information System(GIS). Urban change type map was created by using the process of piling up the bit images. Then the urban change type map was compared with each land cover map for the change detection. Dalseo-gu of Daegu city and Hwawon-eup of Dalsung-gun, the fringe area of Daegu Metropolitan city, were selected for the test area of this multi-temporal change detection method. The districts are adjacent to each other. Dalseo-gu has been developed for 30 yeais and so a large area of paddy land has been changed into a built-up area. Hwawon-eup, near by Dalseo-gu, has been influenced by the urbanization of Dalseo-gu. From 1972 to 1999, 3,507.9ha of agricultural area has been changed into other land uses, while 72.7ha of forest area has been altered. This agricultural area was designated as a 'Semi-agricultural area'by the National landuse Management Law. And it was easy for the preserved area to be changed into a built-up area once it would be included as urban area. Finally, the method of treatment and management of the preserved area needs to be changed to prevent the destruction of paddy land by urban sprawl on the urban fringe.

• 한국물환경학회지
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• 제32권5호
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• pp.465-474
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• 2016

Since Gyungan stream is included in the protected zone of the water supply source of the Metropolitan area in Korea, the water quality needs to be continuously managed. Therefore, a measure is required that can inhibit the flow of water pollutant into the water body and facilitate the ecological restoration of riparian vegetation. A field survey was conducted on the hydrological characteristics of the landscape elements established on the downstream catchment of the Gyungan stream, the result of which showed that the paddy field and urbanized area can be regarded as point pollution sources. The upland field can be regarded as a non-point pollution source. In order to improve the water quality in the Paldang lake, we first recommended creating a riparian vegetation belt. We also suggested introducing a treatment wetland and an artificial plant island to places in which the creation of a riparian vegetation belt is not ensured. We recommend creating a treatment wetland equipped with diverse functional groups. For creating the plant island, we recommend Zizania latifolia and Typha orientalis, which showed the highest productivity among aquatic plants. The former could be introduced around the outlet of a paddy field and the estuary of tributaries, while the latter could be introduced to a water body directly sourced from mountainous land.

• 한국응용곤충학회지
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• 제43권1호
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• pp.27-34
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• 2004

더덕(Codonopsis lanceolata) 재배지에서 당근뿌리혹선충의 환경친화적 방제법을 구명코자 방제실험을 수행한 결과 당근뿌리혹선충 방제 실험에 사용된 방제제들(Bacillus thuringiensis, Paecilomyces lilacinus, fosthiazate, 한약제 추출물) 중 더덕의 발아를 향상시키는 것을 Bt와 한약제 추출물이었고, 억제시키는 것은 fosthiazated였다. Pot에서 미생물제에 의한 당근뿌리혹선충 밀도억제 효과는 Bt와 Paecilomyces lilacinus 모두 우수하였으나 fosthiazate 보다는 떨어지는 경향이었다. 또한 한약제 추출물도 방제효과가 우수하였다. 포장실험에서도 Paecilomyces lilacinus와 fosthiazate 처리 시 수확량이 가장 많았으며 수확된 더덕의 품질도 가장 우수하였다. 한약제추출물도 무처리에 비하여 더덕의 수량 증대에 효과가 있었고, 뿌리혹선충 감염지에서 키운 더덕을 이식한 것이 비감염지에서 키워 이식한 더덕에 비하여 수량 증가율이 저조하였다.

• 농업과학연구
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• 제32권1호
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• pp.81-94
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• 2005

This study is aimed at giving the basic information for individual farm households to make decisions for optimizing their farm sizes and for the government to implement farm size optimization policies through the identification of combinations among rice production factors in plain areas like Cheolwon district and the suggestion of the optimal farm sizes of individual farmers based on the scale of economy calculated. The data of agricultural production costs of 50 rice farmers in the plain area which is located in Dongsong-eup Cholwon district, Kangwon province were used in the analysis. The 'translog' cost function among various methods which is a flexible function type was adopted to calculate the scale of economy in rice production. Seemingly unrelated regression(SUR) method was used in forecasting functions and processing other statistics by SHAZAM which is one of the computer aid program for quantitative econometric analysis. In conclusion, the long-run average cost(LAC) curve showed 'U-shape' which was different from 'L-type' one which was shown in the previous studies by others. The lowest point of the LAC was 9.764ha and the concerned production cost amounted to 633 Won/kg. Based on these results, it have to be suggested that around 10 ha of paddy is the target size for policy assistances to save costs under the present level of farming practices and technology. The above results show that the rice production costs could be saved up to 10ha in Cheolwon plain area which is a typical paddy field. However, land use, land condition, land ownership and manager's ability which may affect scale of economy should be considered. Furthermore, reasonable management will have to be realized by means of labor saving technology and cost saving management skill like enlargement of farm size of rice.

• 드라이브 ㆍ 컨트롤
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• 제21권2호
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• pp.36-43
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• 2024

The yield is basic and necessary information in precision agriculture that reduces input resources and enhances productivity. Yield information is important because it can be used to set up farming plans and evaluate farming results. Yield monitoring systems are commercialized in the United States and Japan but not in Korea. Therefore, such a system must be developed. This study was conducted to develop a yield monitoring system that improved performance by correcting a previously developed flow sensor using a grain tank-weighing system. An impact-plated type flow sensor was installed in a grain tank where grains are placed, and grain tank-weighing sensors were installed under the grain tank to estimate the weight of the grain inside the tank. The grain flow rate and grain weight prediction models showed high correlations, with coefficient of determinations (R2) of 0.9979 and 0.9991, respectively. A main controller of the yield monitoring system that calculated the real-time yield using a sensor output value was also developed and installed in a combine harvester. Field tests of the combine harvester yield monitoring system were conducted in a rice paddy field. The developed yield monitoring system showed high accuracy with an error of 0.13%. Therefore, the newly developed yield monitoring system can be used to predict grain weight with high accuracy.

• 한국환경복원기술학회지
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• 제6권1호
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• pp.65-70
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• 2003

This research aims to classify wetland types and evaluate functions of a wetland created by abandoned rice paddies. The case study area is Ja-un wetland in Daejeon Metropolitan City. In this study, wetland types were classified based on the basic elements of wetlands such as hydrology, vegetation, and soil conditions. This study was carried out based upon field surveys, drawing maps and publication, and modified-RAM which can evaluate the general functions and conservation values of wetlands. The analysis shows that several types of wetlands were identified, such as Palustrine/ Perennial/ Hydrophytes, Palustrine/ Perennial/ Openwater, Palustrine/ Seasonal/Herbal, Palustrine/ Seasonal/ Shrub and Scrub, Palustrine/ Seasonal/ Hydrophye, and Riparian/ Seasonal/ Shrub and Scrub in the Ja-un wetland. The average level of functions of the wetlands is very "HIGH", and it is recommended that prompt conservation measures should be taken.

• Journal of Biosystems Engineering
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• 제17권1호
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• pp.45-54
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• 1992

A wireless control system was designed and constructed to control the rice transplanter of walking type with remote control. VHF(very high freqency) was sent from wireless transmitter to wireless reciever by usig 6 channels to control main clutch, steering clutch, plant lever and throttle lever within 200 meter distance between remote control and rice transplanter. The rice transplanter with wireless control system showed good performance for accuracy of travel speed, traveling mobility and turning diameter in the concrete, paddy and dry field. It is concluded that the developed wireless control system could be adapted to control not only conventional rice transplanters but also most of the agricultural machine by changing some parts of the control system.

• 한국잡초학회지
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• 제32권3호
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• pp.256-262
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• 2012

본 시험은 몇몇 사료용 피들의 생육특성과 논에서 잡초화 방지를 위하여 국내 논에서 사용량이 많은 제초제들에 대한 반응을 조사하기 위하여 실시되었다. 겨울철 유리 온실 내의 대형 콘크리트 폿트에서 사료 가능성이 높은 피 8계통들의 생육을 조사한 결과 IT170609, IT196421 그리고 EV2012 계통들이 건물중 생산성이 상대적으로 높았다. 출수기에 따른 품종적 특성은 IT170609 계통은 중만생종, IT196421 및 EV2012 계통들은 만생종으로 나타났다. 선발된 사료용 피 3계통에 대한 발아율은 재래종인 강피 보다 높았고, 20 및 $25^{\circ}C$에서 뚜렷하였다. 논에서 사료용 피들의 잡초화 방지를 위한 제초제 시험에서 토양처리제인 imazosulfuron+benzobicyclone+penoxsulam 액상수화제는 사료용 피 3계통에 대하여 90% 이상의 효과를 보였다. 경엽처리 제초제들인 cyhalofop-butyl 유제, penoxsulam 액상수화제, metamifop 유제는 사료용 피 6~7엽기까지 매우 높은 효과를 보였다.

• Journal of Applied Biological Chemistry
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• 제56권4호
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• pp.229-234
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• 2013

석탄회는 B, Ca 등의 식물영양소를 함유하고 토양과 유사한 성분함량을 갖고 있어 농경지 토양의 비옥도 증가 및 개량을 위한 물질로 농업적으로 활용 가능성이 클 것으로 판단된다. 본 연구는 비산재를 과립형태로 제조하여 개량제로 시비하였을 때 논토양과 벼의 생육에 미치는 영향을 평가하였다. 시험구의 처리는 무처리구, 화학비료 처리구, 석탄회 시비구 2종으로 구성하였으며, 실제 농경지에 적용하였고, 벼 재배 후 토양의 특성 변화와 농작물의 수량 및 품질을 분석하였다. 벼 재배 후 개량제를 처리한 토양의 화학적 특성은 pH, EC 및 유기물 함량이 대조구와 큰 차이를 나타내지 않았다. 하지만 유효인산, 유효규산과 치환성 칼슘, 마그네슘의 함량은 대조구(127, $23mg\;kg^{-1}$; 1.18, $0.08cmol_+kg^{-1}$)보다 증가하여 유효인산과 유효규산은 최대 149와 $27mg\;kg^{-1}$, 치환성 양이온은 1.28과 $011cmol_+kg^{-1}$으로 관행시비와 비슷한 효율성을 나타냈다. 벼의 생육 측면에서 초장, 엽색도 분얼수는 개량제를 처리한 처리구에서 가장 높은 것으로 나타났고, 생산량 측면에서 통계적으로 유의성은 없지만 등숙률, 백미중이 개량제 처리에 따라 무비구에 비해 7% 수준 증가하였다. 또한 연구에서 사용한 화학적 첨가물을 함유한 개량제의 처리는 백미 중의 성분함량 중 T-N, $K_2O$ 및 $P_2O_5$ 함량을 증가시켰으며, 질소의 공급은 체내 단백질함량을 증가시키는데 도움을 준 것으로 나타났다. 토양 및 쌀 분석결과 유해중금속의 함량은 대조구와 비슷한 수준으로 나타나 안전성이 검증되었다. 본 연구의 결과를 토대로 석탄회를 농업 측면에서 재활용할 경우 토양과 작물에 유익한 환경을 제공할 수 있고, 자원의 재활용 측면에서 연구가치가 높을 것으로 판단된다.

• 한국토양비료학회지
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• 제19권2호
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• pp.115-121
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• 1986

원자력시설(原子力施設)에서 방출(放出)될 수 있는 장반감기핵종중(長半減期核種中)의 하나인 $Cs^{137}$을 5개 답토양(畓土壤)에 처리(處理)하여 토양중(土壤中)에서의 흡(吸) 탈착상태(脫着狀態)를 조사하여 다음과 같은 결과를 얻었다. 1. $Cs^{137}$은 토양(土壤)에 다량(多量) 흡착(吸着)되며 치환성형태(置換性形態)의 탈착량(脫着量)은 K첨가에 따라서는 감소(減少)하였고, $Cs^{137}$ 처리량(處理量)의 증가에 따라서는 비례적으로 증가하였으며 치환성형태의 탈착량(脫着量)은 수용성(水溶性)에 비하여 매우 높았다. 2. 토양(土壤)에 첨가된 $Cs^{137}$의 존재형태(存在形態)는 토양(土壤)에 따라서 차이(差異)가 있으나 평균적으로 수용성(水溶性)이 5.9%, 치환성(置換性)이 17.1%, 비치환성(非置換性)이 77.0%로 나타났다. 3. 토양(土壤)에 흡착(吸着)된 $Cs^{137}$의 수용성(水溶性) 및 치환성탈착량(置換性脫着量)은 토양(土壤)pH와 치환성 염기함량의 증가에 따라 감소(減少)하였고, 유기물과 점토함량(粘土含量)의 증가에 따라서는 증가하였다. 4. 토양(土壤)에 흡착(吸着)된 $Cs^{137}$은 Illite와 Vermiculite가 많은 토양(土壤)에서 비치환성형태(非置換性形態)로의 흡착(吸着)이 많았다.