인터네트워크에서 트래픽 분석에 관한 연구

구현회 배화여자대학 1999 培花論叢 Vol.18 No.-

This thesis presented an analysis of the packet flowing in Kreonet, thereby considering the spatial concept of the network. This study provided an analysis as to whether the packet information flowing through the inter-network is operated in the real form and the amount of packet, and the study also analysed of the packet information, so that it may become important information in designing for the interlock between the ever-increasing amount of information and network. And it is expected that the study, which has been analyzed in this thesis, will not contribute to prepare for the network environment only when the technical power of the system (bridge, gateway, etc) to be developed in the future is improved and a diversity of information is transmitted as comprehensive information communications in an integreated way.

Henoch-Schomlein자반증 환아에서 신침범의 위험인자 분석

구현회,하태선 대한신장학회 2003 대한신장학회잡지 Vol.22 No.6

Effect of Pig Manure Compost or Sucrose Application on Recovering Chinese Cabbage from Ammonium Toxicity

구현회,김승환 한국토양비료학회 2016 한국토양비료학회지 Vol.49 No.3

This study was carried out to evaluate the effect of application of urea and combination of urea and pig manure compost (PMC) on the occurrence of and the recovery from ammonium (NH4+) toxicity in Chinese cabbage. To identify NH4+ toxicity of the crop four levels of urea at 0, 160, 320, and 480 kg N ha-1 were applied, in addition, three levels of PMC at 10, 20, and 40 M/T ha-1 was also applied with urea 320 kg ha-1. For recovery NH4+ toxicity, six levels of sucrose were treated at the amount of 0, 600, 1,200, 1,800, 2,400, and 3,000 kg C ha-1 at each level of combining treatments of urea and PMC. Our results showed that NH4+ toxicity was occurred at every urea application of 320 kg N ha-1 regardless of PMC applied to the soils because NH4+ contents in the soils were more than 155 mg kg-1 which was found to be the critical level to damage crop growth at 2 days after transplanting (DAT) in this experiment, the more sucrose was applied up to 1,800 kg C ha-1 for the plants damaged by ammonium toxicity occurred at 320 kg N ha-1, the greater extents recover the plants from the toxicity. PMC showed the similar effect with sucrose on recovering Chinese cabbage plants from NH4+ toxicity at 30 DAT.

Alleviating Effect of the Application of the Easily Decomposable Carbohydrate on Ammonium Toxicity in Chinese Cabbage (Brassica rapa var. chinensis)

구현회,이상은 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.5

An excess application of N fertilizer causes physiological and morphological disorder known as ammonium (NH4+) toxicity in Chinese cabbage and it has been to be an issue for appropriate N fertilizer management. Hence, the pot experiment was conducted in order to evaluate the alleviating effect of the application of the easily decomposable carbohydrate on NH4+ toxicity in Chinese cabbage. Four levels of urea at 0, 160, 320, and 640 kg N ha-1, represented as T1, T2, T3, and T4, respectively, were applied. In order to evaluate the alleviating effect of the application of the easily decomposable carbohydrate (sucrose) at T3 and T4 where NH4+ toxicity had occurred, five levels of sucrose were applied to meet C/N ratios of 0, 2, 4, 6, and 10, respectively. Our results showed that the NH4+ toxicity was observed at T3 and T4 at 5 days after treatment (DAT). NH4+ toxicity contributed to decrease fresh weight, length of leaves, length of root, and number of leaves significantly (p<0.05). The application of sucrose as a source of mitigating NH4+ toxicity had a good performance at T3 with the alleviating effect as 73 % and reduced in NH4+-N content in soil at 29 DAT. In the maximum N rate of T4, however, sucrose application recovered it as 32 % only compared to T2 even though the same C/N ratio was treated. Consequently, sucrose as the easily decomposable carbohydrate played crucial role to reduce NH4+ concentration in soil and finally alleviated NH4+ toxicity in plant.

토양배지의 pH가 재배 및 자생 부추류의 생육과 양분흡수에 미치는 영향

구현회,이상각,장매희,최종락,이상은 한국환경생물학회 2019 환경생물 : 환경생물학회지 Vol.37 No.1

This experiment was conducted to investigate the effects of pH on the mineral nutrient uptake and growth of the four Chinese chives species. The Chinese chives species used in the experiment were the cultivated species grown in the farm (cultivated Allium tuberosum) and three wild species of wild Allium tuberosum, A. thunbergii and A. senescens. The pH levels of soil medium were set to be 4.5, 6.5, and 7.5. Fresh weight (FW) of cultivated A. tuberosum was highest at all pH levels. The increase of soil pH increased the FW of the wild A. tuberosum and A. thunbergii, but no difference was noted for the A. tuberosum and A. senescens. Plant height was higher in the order of wild A. tuberosum, A. thunbergii, and cultivated A. tuberosum and A. thunbergii. Notably plant height of the wild A. tuberosum increased significantly by the pH increase. The Zn content of the wild A. tuberosum was shown to be significantly higher than that of the other species and increased with the increase of soil pH. This indicates that there is a close relationship between the plant height and Zn content in Chinese chives plant. Principal component analysis for characterizing closely related A. species using the factors of plant growth and amounts of nutrients uptake showed that the cultivated A. and wild A. tuberosum were in the 4th quadrant of the graph which are classified as the same species, while A. senescens and thunbergii was in 1st and 3rd quadrant indicating different species, respectively. 본 실험은 토양배지의 pH 수준에 따른 4가지 부추종의 무기양분 흡수와 생육에 미치는 영향을 구명하고자 육묘포트에서 재배실험을 실시하였다. 실험에 사용된 부추종은 농가에서 재배하고 있는 재배부추와 야생하는 야생부추, 산부추, 두메부추를 자생지에서 수집한 것을 사용하였다. 배양토의 pH 수준은 5.5, 6.5, 7.5로 3수준이었다. 실험의 결과는 다음과 같다. 1. 재배부추는 모든 pH 수준에서 타 부추종들에 비하여 생체중이 가장 컸다. 한편 토양 배지 pH 수준의 증가는 야생부추와 산부추의 생체중을 증가시켰던 반면, 일반부추와 두메부추의 생체중에는 영향을 미치지 못하였다. 2. 초장은 전체 pH 조건에서 야생부추, 산부추>재배부추>두메부추 순으로 컸다. 초장은 야생부추와 산부추가 일반부추에 비해 월등히 컸던 반면 생체중은 그 반대이었는데, 그것은 각 부추종의 형태적 차이 때문으로 판단되었다. 한편 타 부추종과 달리 야생부추의 초장은 pH 증가에 따라 통계적으로 유의성 있게 증가하였다. 이것은 본 실험에 사용하기 위하여 채취한 야생부추 자생지의 토양특성과 관련이 있는 것으로 판단되었다. 3. 야생부추의 Zn 함량은 타 부추종에 비해 월등히 높았으며, 배지 pH 수준이 증가할수록 증가하였다. 이는 야생부추의 초장이 타 부추종에 비해 크고, pH 증가에 따라 유의성이 있게 증가하는 원인 중의 하나가 식물체내 Zn 함량 증가에 있다는 것을 나타낸다. 4. 생육량과 무기양분흡수량에 의한 주성분 분석은 부추류의 근연관계를 밝히는데 유용하였다.

사과 재배 중 과수전용 복합비료 유래 암모니아(NH3) 배출 특성

구현회,문태일,김대관,임지연,유성영,정은아,엄태선,심지영 한국환경생물학회 2020 한국환경생물학회 학술대회 Vol.2020 No.11

배추 재배지에서 질소 시비 반응에 따른 암모니아(NH3) 발생 특성

구현회,김대관,문태일,임지연,유성영,정은아,엄태선,심지영 한국환경생물학회 2020 한국환경생물학회 학술대회 Vol.2020 No.11

Nondestructive and Rapid Estimation of Chlorophyll Content in Rye Leaf Using Digital Camera

구현회,이상은,김승환,윤승길,최관수,엄호용,김태완 한국작물학회 2004 Korean journal of crop science Vol.49 No.1

We have developed and tested a new method for nondestructive estimation of chlorophyll- and nitrogen-contents in rye leaf. It was found that the relationships among nitrogen and chlorophyll content and fresh weight were significantly positive correlated. Nitrogen and chlorophyll content were positively correlated whereas correlation coefficients among R, G, R-B and G-B on the basis of photo-numerical values were negative. We have found that R/(R-B) obtained from data of digital camera is the best criterion to estimate the chlorophyll content of leaves. The regression curves of the relation between R/(R-B) and chlorophyll content were also calculated from the data collected on cloudy days. The coefficients of determination (r2) were ranged from 0.33 to 0.99. In this study, the accuracy in estimating chlorophyll content from the color data of digital camera image could be improved by correcting with R, G, and B values. It is suggested that, for practical purposes, the image values estimated with sufficient accuracy using a portable digital camera can be applied for determining chlorophyll content and nitrogen status in plant leaves.

Comparison of Different Approaches on Determining Nitrogen Balance in a Lowland Paddy Soil

구현회 한국토양비료학회 2018 한국토양비료학회지 Vol.51 No.3

Nitrogen (N) balance is a key indicator assessing a degree of soil fertility and N loading by accounting input minus output N in agro-ecosystem. However, a recent approach on determining N balance has been evaluated regarding a change in soil N stock for continuing crop cultivation. To describe an assessment method on N balance, this study was conducted with three different methods, Method A (Input N−Output N (crop N removal+Loss N) = N surplus or deficit), Method B (Input N − Output N (crop N removal+Loss N + Δ soil total N) = N surplus or deficit), and Method C (Input N − Output N (crop N removal+Loss N) + Δ soil total N = N surplus or deficit). Four levels (0, 60, 120, and 180 kg N ha-1) of N from urea and two levels (120 and 180 kg ha-1) of N from combination of urea and CM (Urea:Cattle Manure = 60:60 and 60:120) were applied in a lowland paddy soil. Results showed that Method B indicated all negative N values regardless the sources and rates of N application, while Method A and C described different N balance values in the given N applications. Using Method A, a response of N balance to urea applications (0, 60, 120, and 180 kg N ha-1) was linearly increased. The values of N balance were negative at 0 and 60 kg N ha-1, while it was close to zero at 120 kg N ha-1 and showed the higher value at 180 kg N ha-1, respectively. Similarly, the combined N applications at 120 and 180 kg N ha-1 showed similar N balance values. Meanwhile, Method C indicated different N balance values at the combined N applications, showing significantly higher N balance values at 120 kg N ha-1 and the more value at 180 kg N ha-1, as compared with Method A. The difference was attributed to the soil N stock considering as count factor in determination of N balance. Thus, the study recommended Method C when evaluating both of soil fertility and N loading in crop cultivation field.

토양 건전성 평가를 위한 관행농법과 유기농법 비교 분석 방법

구현회(Hyun-Hwoi Ku),김아린(A-Rin Kim),강제모(Je-Mo Kang),이용선(Young-Seon Lee),Adegoke Toluwase Oreoluwa 한국토양비료학회 2022 한국토양비료학회 학술발표회 초록집 Vol.2022 No.10