소형 라이시미터를 활용한 유기자재에 따른 유기농 논물에서의 무기태질소 동태

옥정훈 ( Jung-hun Ok ),신재훈 ( Jae-hoon Shin ),조정래 ( Jung-lai Cho ),안난희 ( Nan-hee An ),남홍식 ( Hong-shik Nam ),정지희 ( Ji-hee Jeong ),정정아 ( Jung-ah Jung ),김석철 ( Seok-chol Kim ) 한국환경농학회 2016 한국환경농학회 학술대회집 Vol.2016 No.-

Behavior of inorganic nitrogen in organic paddy field water depending on organic nutrient sources was monitored using mini-lysimeters. The mini-lysimeters were placed in National institute of Agricultural Sciences (NAS). 36 undisturbed paddy field soil samples of 30 × 80 cm (diameter × height) was collected by special sampler and installed in mini-lysimeters. After stabilization of lysimeters, several input treatments of organic nutrient sources were applied, including compost, expeller cake and green manures of hairy vetch and rye. Each nutrient source as recommended by the standard amount of fertilizer for rice was supplied 2 weeks before rice transplanting. The water level was maintained 10 cm water depth, and water samples were collected periodically. The pH, specific electrical conductance (EC), and inorganic nitrogen concentration in paddy water was monitored during the experimental period. The average pH value in paddy water was ranged from 7.1 to 7.7. The average EC value in paddy water were ranged from 0.25 to 0.97, and showed to appear higher tend rye > compost > hairy vetch > expeller cake > chemical fertilizers > control. The change of inorganic nitrogen concentration in paddy water is shown in figure 1. The inorganic nitrogen concentrations quickly reached their highest within 26 days after organic nutrient application and decreased afterwards. The inorganic nitrogen concentration for expeller cake and green manure treatments were higher as compared to that for compost and chemical fertilizers treatments. The increasing and decreasing of inorganic nitrogen concentration showed different trends according to the processing of organic nutrient sources.

신규 유기농경지에서 지속적인 퇴비 및 녹비 공급방법에 따른 토양의 비옥도 변화 모니터링

옥정훈 ( Jung-hun Ok ),안난희 ( Nan-hee An ),이병모 ( Byung-mo Lee ),조정래 ( Jung-lai Cho ),신재훈 ( Jae-hoon Shin ),공민재 ( Min-jae Kong ),정정아 ( Jung-ah Jung ) 한국농공학회 2014 한국농공학회 학술대회초록집 Vol.2014 No.-

Monitoring for soil fertility change according to continuous organic supply of organic compost and green manure in newly organic field was conducted in iseo-myeon, wanju-kun, Jeollabuk-do, Korea, where is relocated for Rural Development Administration. Due to the newly reclaimed field, this experiment site soil was very low fertility and low physico-chemical properties. Several organic supply way for organic agricultural practices were applied organic compost such as compost and green manure during 3 years. The other way for conventional agricultural practice was applied chemical fertilizer, and control without fertilizer. The pH, electric conductivity (EC), organic matter (OM), C/N ratio, available phosphate (Av.P₂O₅), and exchange cation in soil were monitored continuously during 3 years. Soil fertility in organic compost treatment was improved compare to chemical fertilizer treatment and control. The concentration in organic compost treatment was increased continually and closed to the recommended rate of soil fertilizer (Fig 1).

IEEE 802.11e EDCA 기반 모바일 IPTV Qos 보장을 위한 Multimedia Smart Dispatcher Algorithm

정정아(JungAh Jung),백경욱(KyungWook Baek),윤희용(HeeYong Youn) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1D

무선 랜의 기술이 사용자에게 이동성과 편리성을 제공함에 따라 무선 랜 환경에서의 컨텐츠들이 다양화되고 있다. 특히 모바일 IPTV는 양방향 멀티미디어 서비스로 무선 랜을 통해 서비스를 제공받고자 할 때 QoS가 확실히 보장되어야 하는 서비스임에 틀림이 없다. IEEE 802.11 기반 무선 랜은 이동성과 편리성을 제공하지만 일반적인 데이터만을 전송대상으로 고려하고 있어 멀티미디어와 같은 데이터를 처리하여 서비스하는 데에 한계가 있다. 이러한 문제점을 보안하여 사용자에게 QoS를 보장하기 위한 방법으로 IEEE 802.11e 표준이 제정되었다. 하지만 IEEE 802.11e EDCA 방식을 이용하여 데이터의 우선순위대로 데이터를 전송하는데 있어 트래픽이나 연결 단말의 수가 과도할 경우, 사용자의 QoS를 보장하지 못하는 문제점이 있다. 본 논문에서는 IEEE 802.11e EDCA 기반에서 모바일 IPTV의 QoS를 보장하기 위한 MSDA 알고리즘을 제안한다.

유기자재와 강수량이 수수${\times}$수단그라스 교잡종의 질소이용효율에 미치는 영향

최현석,이연,정정아,지형진,이상민,국용인,정석규,Choi, Hyun-Sug,Lee, Youn,Jung, Jung-Ah,Jee, Hyeong-Jin,Lee, Sang-Min,Kuk, Yong-In,Jung, Seok-Kyu 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.3

탄질비가 다른 유기자재 시용이 토양중 무기태질소의 시기별 변화와 수수${\times}$수단그라스 교잡종의 질소이용률에 미치는 영향을 조사하기 위해서 2009년부터 2011년까지 수행되었다. 처리구는 질소함량 210kg/ha 수준으로 축분퇴비, 알팔파, 유박, 포함하였다. 유박은 가장 낮은 탄질비를 나타내었고, 축분퇴비는 3년 동안 가장 낮은 질소의 무기화가 관찰되었다. 토양 무기성분과 수수${\times}$수단그라스 교잡종의 건물중은 처리에 따라 일관성 있게 영향을 받지 않았고, 건물중은 재배기간인 5월부터 9월까지의 강수량과 부의 상관관계를 나타내었다. 화학비료는 2009년과 2010년에 질소이용률을 크게 증가시켰고, 축분퇴비는 3년간 가장 낮은 질소이용률을 보였다. 6월부터 8월까지의 강수량 증가는 퇴비로 처리된 수수${\times}$수단그라스 교잡종의 질소이용률을 다소 증가시켰으나 양분의 무기화가 빠른 화학비료는 반대의 양상이 관찰되었다. 본 시험에서는 유기자재의 탄질비 보다는 강수량의 변동이 클 때 작물의 건물중과 질소이용률에 영향을 끼치므로 이를 고려하여 밭토양에 시비를 해야 할 것으로 판단되었다. This study was conducted to evaluate soil inorganic N concentrations and N uptake efficiency of sorghum ${\times}$ sudangrass hybrid (Sorghum bicolor (L.) Moench) as affected by organic nutrient sources from 2009 to 2011. The treatments included chemical fertilizer, compost, oilcake, alfalfa hay mulch, and control. Nutrient applications were made at rates equivalent to approximately 210 kg of actual N per hectare. The precipitation during the growth period from May to September was higher in 2011, followed by 2009, and 2010. Oilcake had the lowest C:N ratio in the raw materials. Compost treatment slowed N-mineralization rate in soil during the measured years. Soil mineral nutrition and dry matter production were not consistently affected by treatments, but the dry matter production was negatively correlated with the amount of precipitation from May to September for three years. Chemical fertilizer treatment increased N efficiency in plants in the first two years, observing with lower N efficiency in plants treated with compost for 3 years. Increased precipitation from June to August improved N efficiency in sudangrass plants treated with compost but reduced the efficiency with the chemical fertilizer. Total dry matter production and N efficiency in plants were not affected by the C:N ratio of the raw materials rather than weather condition.

유기자원 연용이 유기농 옥수수 밭토양의 화학성과 옥수수 수량에 미치는 영향

공민재,안필균,정정아,이초롱,이상민,안난희,Kong, Minjae,An, Philgyun,Jung, Junga,Lee, Chorong,Lee, Sangmin,An, Nanhee 한국환경과학회 2020 한국환경과학회지 Vol.29 No.12

This study performed to conduct a test to increase the amount of appropriate organic matter input to organic upland soil, soil fertility, and its effect on the chemical changes and yield of corn in soil due to organic use. The pH level of the T1, T5, and T6 treatment zones where livestock excreta was used was raised to 6.0-6.5, the optimal range of the soil in Korea, and it was confirmed that the pH value was appropriate. Electrical Conductivity (EC), organic content (OM), and total nitrogen (T-N) were also identified as a trend of continuous increase. The quantity of corn gradually increased from 74.1% to 96.4% over the four-year period with the use of organic materials compared to the beginning of the test, and the utilization efficiency of nitrogen has also increased. The results of the study were found to have been able to examine the increase in quantity and changes in soil chemistry through crop cultivation using organic materials such as natural materials, green manure crops, and livestock manure compost, and it is also believed that the changes due to various factors such as soil environment, soil microbes, and climate conditions need to be made through continuous research.

토양 화학성 및 생물학성 변화에 대한 녹비작물 시용 효과

최봉수(Bong-Su Choi),정정아(Jung-Ah Jung),오미경(Mi-Kyung Oh),전상호(Sang-Ho Jeon),고현관(Hyun-Gwan Goh),옥용식(Yong Sik Ok),성좌경(Jwa-Kyung Sung) 한국토양비료학회 2010 한국토양비료학회지 Vol.43 No.5

시설재배지의 경우 휴작기간 동안 녹비작물의 활용가능성이 높을 것으로 판단된다. 본 연구는 녹비작물이 시설재배지에서의 양분공급 및 토양질 개선에 미치는 영향을 평가하고자 두과 (헤어리베치, 크림손클로버) 및 화본과 (호밀, 수수, 수단그라스) 녹비작물을 재배 후 토양과 혼합하였으며, 무기질소 공급능과 생물적 지표로써 토양 탄수화물, 미생물활성 및 부식함량의 경시적 변화를 측정하였다. 관행구의 무기태 질소함량은 전 기간 비슷한 수준을 유지하였으나 녹비작물을 처리한 토양에서는 토양처리 후 4주까지 무기태질소 함량이 지속적으로 증가하였고, 특히 수단그라스에서 무기태질소 함량이 두드러지게 증가하였다. 녹비작물 처리 후 토양 중 수용성 당은 두과 녹비작물 처리 후 서서히 증가하기 시작하여 7주 경에 가장 높았으며 이후 서서히 감소하는 경향이 나타났다. 반면 화본과 녹비작물 처리 후 수용성 당이 빠르게 증가하여 처리 후 4주 경에 최대치에 도달한 후 감소하는 양상이 나타났다. 토양 내의 부식산 (humicacid)은 아무것도 첨가하지 않은 관행구와 녹비처리 초기에는 비슷한 수준으로 낮았으나 녹비처리 후 4주 정도 시간이 경과하면서 녹비작물의 부숙에 의해 형성된 부식산이 점점 증가하는 것을 확인할 수 있었다. 또한 양이온과 결합하여 물에 잘 용해되는 염을 만드는 fulvic 산에서도 작물 간 차이는 있었지만 부식산의 함량 변화와 비슷한 경향이었다. We used green manure crops such as hairy vetch, crimson clover, rye, sorghum, and sudan grass by mixing with soils to assess the effects of green manure crops on nutrient supply and soil quality improvement. Temporal changes in soil inorganic nitrogen, carbohydrate, microbial biomass, and humus content were determined as soil quality indicators. Inorganic nitrogen content of the control maintained similar level during the whole period, but it had continually increased until 4 weeks after incorporation (WAI) of green manure crops. Especially, inorganic nitrogen content sharply increased in sudan grass. After incorporation of green manure crops, temporal change of soluble sugar in soils was as follows: it had gradually increased in legume green manure crops-incorporated soils until 7 WAI, which was the highest, and then showed the tendency to be reduced. Meanwhile, it in non-legume green manure crops-incorporated soils rapidly increased after the incorporation, and reached the maximum around 4 WAI. Humic acid by the decomposition of crop residues in green manure crops-incorporated soils was greatly enhanced with the elapsed time of 4 WAI, although it was low at the same level as the control until 2 weeks. In addition, there was a difference in fulvic acid by incorporated crops, fulvic acid in hairy vetch, sorghum and sudan grass showed a similar tendency with the change in humic acid. Our results suggest that soluble sugar, microbial activity and humic acid could be available indicators to evaluate the fertility of green manure crops-incorporated soils.

저온에 대한 식물의 양분흡수, 탄수화물 및 항산화 반응 특성

이수연(Suyeon Lee),정정아(Jungah Jung),성좌경(Jwakyung Sung),하상건(Sangkeun Ha),이덕배(Deogbae Lee),김태완(Taewan Kim),송범헌(Beomheon Song) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.2

Recently, a quick drop of air temperature in plastic film houses by adverse weather conditions leads to the occurrence of low temperature damages to growing crops. Chilling injury, defined as a variety of growth restriction occurring below the optimal temperature, is one of environmental factors strongly affecting crop growth and yield. Low temperature causes the restricted evapotranspiration, reduced mineral uptake (P > K > NO₃?), and an increase in electrolyte leakage such as K. Despite being different with plant species, an accumulation of soluble carbohydrates such as glucose, fructose, sucrose and starch under chilling condition is well known. A variety of environmental stresses are known to cause oxidative damage to plants either directly or indirectly by triggering an increased level of production of reactive oxygen species (ROS), and, to combat the oxidative damage, plants have the antioxidant defense systems comprising of enzymes, SOD, POD, CAT, GPX and APX, and non-enzymes, ascorbate, gluthathione, α-tocopherol, phenolic compounds, carotenoid and flavonoids. The aim of this review is to provide basic information to build chilling-indicators and optimal nutrition management under adverse temperature conditions as broadly considering mineral uptake, carbohydrate metabolism and antioxidative defense system.

인스토어 쇼핑에 필요한 모바일 애플리케이션 정보구조 디자인 제안

장영훈(Young Whun Chang),전성호(Sungho Jeon),정정아(Jung-ah Chung),박정아(Jungah Park) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1

모바일 쇼핑 시장의 통계적 기록에 의하면, 현재 시장의 크기가 점차적으로 커지고 있는 상태이다. 이렇게 모바일 쇼핑을 하고 있는 사람들의 주요 행동을 분석해본 결과, 모바일 SNS를 통해 상품 검색을 하고 있다. 즉, 상품의 평가 및 가격비교의 정보를 통해 구매 여부를 판단하고 있다. 이러한 온라인 쇼핑 사용자 4명중 1명이 백화점, 대형마트 등의 인스토어 안에서 사용을 하고 있음에도 불구하고, 인스토어 어플리케이션들은 사용자들의 요구사항을 제대로 반영하지 않고 있는 상태이다. 현장 안의 사용자들은 가격 비교 및 기능 설명, 사용자 후기 등의 작업을 스마트폰을 사용하고 있으며, 이러한 사용자의 작업 행동을 고려하여 쇼핑앱의 유저 인터페이스를 개선시킬 수 있는 방안을 제안하였다. According to the statistical results of mobile shopping market, size of the market is gradually increasing. As a result of analyzing mobile shoppers’ behavior, they were searching information about goods by using mobile SNS. In other words, they judge quality and price of good through discovered information Despite the fact that one out of 4 users practiced online shopping in stores, most of in-store applications in Korea hardly recognized needs of these shoppers. Hence, user tasks of in-store application should be comparing prices, reviews and detailed of product, designers must consider those behaviors in order to improve user interface of the shopping application. The approach here is proposed to improve such an interface.

한국 전통음식에 대한 학교급식 영양사의 의식 조사

김경애 ( Kyung Ae Kim ),정난희 ( Lan Hee Jung ),전은례 ( Eun Raye Jeon ),정정아 ( Jeong Ah Jeong ) 대한가정학회 2005 Human Ecology Research(HER) Vol.43 No.2

유기자재 처리가 토양의 양분동태 변화와 수수*수단그라스의 양분이용 효율에 미치는 영향

이연(Youn Lee),최현석(Hyun-Sug Choi),이상민(Sang-Min Lee),정정아(Jung-Ah Jung),국용인(Yong-In Kuk) (사)한국생물환경조절학회 2012 생물환경조절학회지 Vol.21 No.2

본 연구는 탄소 : 질소(탄질)비가 다른 유기자재를 시용하였을 때 시기별 양분의 동태와 유기재배 수수*수단그라스의 비료이용율에 미치는 영향을 조사하였다. 처리구는 질소함량 210㎏/ha 수준으로 축분퇴비, 알팔파, 유박, 화학비료를 포함하였다. 유박과 알팔파는 가장 낮은 탄질비를 나타내었고 축분퇴비는 33.7 : 1의 가장 높은 탄질비를 보였다. 축분퇴비는 시용량이 가장 많았고 이에 따라 토양내 양분농도를 증가시켰다. 탄질비가 낮은 유박과 알팔파는 축분퇴비에 비해서 질소의 무기화율을 촉진시켰다. 질소이용효율은 화학비료구에 비해서 알팔파와 유박이 약 60% 전후를 나타내었고, 축분퇴비는 20% 이하의 효율이 관찰되었다. 인산의 이용효율은 알팔파가 가장 높았고 축분퇴비가 가장 낮았다. 이에 따라 탄질비를 고려한 유기자재를 선택해서 밭토양에 시비를 해야 할 것으로 판단되었다. This study was conducted to evaluate soil nutrient concentrations and fertilizer recovery of sorghum-sudangrass hybrid (Sorghum bicolor (L.) Moench) as affected by organic nutrient sources. The treatments included livestock compost, alfalfa hay, oilcake, and chemical fertilizer. Nutrient applications were made at the rates equivalent to approximately 210 ㎏ N per hectare. The oilcake and alfalfa materials had the lowest C : N ratio, but the livestock compost had the highest C:N ratio such as 33.7 : 1. The livestock compost resulted in the highest input to ground surface, which increased nutrient concentrations in soil. The oilcake and alfalfa materials with low C : N ratios increased N-mineralization rate in soil compared to livestock. The N uptake efficiency in plants treated by alfalfa or oilcake was approximately 60% of those treated with chemical fertilizer; but those with livestock compost had N uptake efficiency lower than 20%. The P₂O? uptake efficiency was the highest in the plants treated with the alfalfa hay, but the lowest in those with livestock compost. Recommendation of organic material selection should consider C:N ratio of the raw materials based on the individual crop requirement.