• 한국작물학회지
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• 제30권4호
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• pp.359-367
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• 1985

본 시험은 산간부인 진안(해발 303 m)에서 생식생장기에 일반상수를 대비하여 냉수를 유수형성기와 감수분열기에 4, 8, 12 일간 관개하였을때 야기되는 물질생산 및 수용계의 냉해반응을 알고자 수행하였던 바 다음과 같은 결과를 얻었다. 1. 냉수관개기간이 길어질수록 간장, 수장, 추출도의 신장이 억제되었으며, 유수형성기 냉수관개는 하위절, 감수분열기 냉수관개는 상위절의 절간신장을 단축시켰다. 또한 지경 및 영화의 퇴화는 유수형성기 냉수 관개에 민감한 영향을 받아 2차지경과 영화의 분화착생수 감소 및 퇴화의 증가를 보였다. 2. 불임율과 등숙장해도 냉수관개기간이 길어질수록 심하였고 유수형성기보다 감수분열기 냉수관개에서 피해율이 현저히 높았는데 특히 피해반응이 예민한 시기는 영화원기분화기와 감수분열기경이었으며 불임율, 등숙비율과 수량과는 유의적인 상관관계를 보였다. 3. Source와 Sink 관련형질중 지경과 영화의 퇴화는 엽면적에 영향을 받고 불임율과 수량은 간장, 수장,추출도의 신장량과 상관이 있었다.

• 전기의세계
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• 제17권2호
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• pp.11-15
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• 1968

One of the most important methods used in the modern analysis of linear networks and systems is the signal flow graph technique, first introduced by S.J. Mason in 1953. In essence, the signal-flow graph technique is a graphical method of solving a set of simultaneous. It can, therefore, be regarded as an alternative to the substitution method or the conventional matrix method. Since a flow-graph is the pictorial representation of a set of equations, it has an obvious advantage, i.e., it describes the flow of signals from one point of a system to another. Thus it provides cause-and-effect relationship between signals. And it often significantly reduces the work involved, and also yields an easy, systematic manipulation of variables of interest. Mason's formula is very powerful, but it is applicable only when the desired quantity is the transmission gain between the source node and sink node. In this paper, author summarizes the signal-flow graph technique, and stipulates three rules for conversion of an arbitrary nonsource node into a source node. Then heuses the conversion rules to obtain various quantities, i.e., networks gains, functions and parameters, through simple graphical manipulations.

• 한국작물학회지
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• 제50권5호
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• pp.301-308
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• 2005

This study was carried out to investigate the effect of stem-cutting (SC) length and portion on the major agronomic characters related with dry matter production and accumulation, and to examine their relation­ships in cassava. When cassava was planted with longer SCs or with older portion SCs, major canopy or source characters like leaf number and leaf area index developed excessively, while tuber yields could be reduced due to the decrease of root/shoot ratio, relative growth rate, root dry weight, and harvest index, particularly in the bitter varieties (high cyanide-level varieties). It was considered that the sweet varieties (low cyanide-level varieties) be early­bulked with higher tuber yield when they are planted with the 25-30 cm long SCs or with the SCs from young type to semi-mature portions of mother stems, while the bitter varieties with the 15-20 cm long SCs or with the SCs from semi-mature to hardwood portions of mother stems, respectively. However, a significant interaction between length and portion of SC was not observed in all agronomic characters.

• 한국작물학회지
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• 제27권1호
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• pp.20-27
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• 1982

출수기 이후 벼의 동화산물이 분벽자간에 이동하고 있는지를 알기 위하여 1979년에는 일본형 품종 아끼바레만을 그리고 1980년에는 아끼바레와 통일계 품관인 밀양 2003의 두 품종을 공시, 출수기에 분벽자단위로 적엽 또는 적수처리의 정도를 달리하므로써 동일주내의 Source와 Sink의 크기를 조절하여 시험한 결과를 요약하면 다음과 같다. 1. 동일주내에서 적엽한 분벽자의 수가 많아질수록 적엽한 분벽자의 등숙율은 점차로 감소되었으나 완전적엽한 주의 등숙율보다는 높은 수치를 보였다. 2. 동일주내에서 적엽일적수의 비율을 달리한 처리구간에는 등숙율의 차이가 없었으나 완전적엽한 주의 등숙율보다는 높은 수치를 보였다. 3. 동일주내에서 적엽한 분벽자의 수가 많아질수록 적엽한 분벽자의 수당립중은 점차로 감소되었으나 완전적엽한 주의 수당립중보다는 많았다. 4. 동일주내에서 적엽일적수의 비율을 달리한 처리구간에는 수당립중의 차이가 없었으나 완전적엽구의 수당립중보다는 많은 값을 보였다. 5. 동일주내에서 적엽한 분벽자의 수를 달리하거나 적엽일적수한 분벽자의 비율을 달리한 결과 출수기 이후에도 동화산물이 분벽자간에 이동되는 것이 확인됐고 이와 같은 현상을 Source와 Sink의 관계로 해석할 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권12호
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• pp.4451-4466
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• 2014

We present joint radio selection and relay scheme that delivers data from a source to a sink in heterogeneous stationary sensor networks consisting of various radio interfaces. The proposed scheme finds the optimal relay nodes and their corresponding radio interfaces that minimize energy consumption throughout the network while satisfying the end-to-end packet deadline requirement. We formulate the problem of routing through radio interface selection into binary integer programs, and obtain the optimal solution by solving with an optimization solver. We examine a trade-off relationship between energy consumption and packet delay based on network level simulations. We show that given the end-to-end deadline requirement, our routing algorithm finds the most energy-efficient routing path and radio interface across mesh hops. We demonstrate that the proposed routing scheme exploits the given packet delivery time to turn into network benefit of reducing energy consumption compared to routing based on single radio interface.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2004년도 춘계 학술대회지
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• pp.290-291
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• 2004

• 한국작물학회:학술대회논문집
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• 한국작물학회 2004년도 춘계 학술대회지
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• pp.70-71
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• 2004

• 대한수학회보
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• 제52권6호
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• pp.1973-2000
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• 2015

In this study, we present a multidimensional open system for valveless pumping (VP). This system consists of an elastic tube connected to two open tanks filled with a fluid under gravity. The two-dimensional elastic tube model is constructed based on the immersed boundary method, and the tank model is governed by a system of ordinary differential equations based on the work-energy principle. The flows into and out of the elastic tube are modeled in terms of the source/sink patches inside the tube. The fluid dynamics of this system is generated by the periodic compress-and-release action applied to an asymmetric region of the elastic tube. We have developed an algorithm to couple these partial differential equations and ordinary differential equations using the pressure-flow relationship and the linearity of the discretized Navier-Stokes equations. We have observed the most important feature of VP, namely, the existence of a unidirectional net flow in the system. Our computations are focused on the factors that strongly influence the occurrence of unidirectional flows, for example, the frequency, compression duration, and location of pumping. Based on these investigations, some case studies are performed to observe the details of the ow features.

• 한국산학기술학회논문지
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• 제15권9호
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• pp.5885-5892
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• 2014

망그로브 식물은 중금속의 sink로 작용하며, 페놀성 화합물의 함량이 높은 것으로 알려져 있다. 따라서 최근에 망그로브 식물을 이용한 phytoremediation과 천연항산화제 개발을 위한 연구가 활발히 수행되고 있다. 이 연구에서는 미크로네시아 웨노섬에 서식하고 있는 4속 6종의 망그로브 식물에 대하여 분류 및 각 종의 잎에서의 항산화 활성을 분석 비교하였다. 6종의 계통관계를 조사하기 위한 분자마커로 엽록체 유전자인 rbcL (large subunit of ribulose-bisphosphate carboxylase)이 사용되었다. 그 결과 Xylocarpus, Sonneratia, Rhizophora 속 순으로 계통적 유사도가 높았으며 Excoecaria 속이 가장 유사도가 낮았다. 한편 6종의 망그로브 줄기 껍질의 페놀성 화합물 함량은 R. apiculata와 X. granatum에서 가장 높게 나타났으며 (1.10 mM/mg), R. stylosa (0.73 mM/mg)와 S. alba (0.72 mM/mg)에서 가장 낮았다(p<0.05). 또한 DPPH 와 ABTS 방법을 이용한 분석 결과, R. apiculate, X. granatum, X. moluccensis 및 E. agallocha는 높은 항산화 활성을 보인 반면, S. alba는 가장 낮은 활성을 보였다. 이러한 결과는 R. apiculata의 줄기껍질이 천연 항산화제 개발을 위한 좋은 원료가 될 수 있음을 의미한다.

• 한국초지조사료학회지
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• 제32권4호
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• pp.343-352
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• 2012

Sulphur deficiency has become widespread over the past several decades in most of the agricultural area. Oilseed rape (Brassica napus L.) is a very sensitive to S limitation which is becoming reduction of quality and productivity of forage. Few studies have assessed the sulphur mobilization in the source-sink relationship, very little is known about the regulatory mechanism in interaction between sulphur and nitrogen during the short-term sulphur deficiency. In this study, therefore, amount of sulphur and nitrogen incorporated into amino acids and proteins as affected by different S-supplied level (Control: 1 mM ${SO_4}^{2-}$, S-deficiency: 0.1 mM ${SO_4}^{2-}$, and S-deprivation: 0 mM ${SO_4}^{2-}$) were examined. The amount of sulphur in sulphate (S-sulphate) was significantly decreased by 25.8% in S-deprivation condition, compare to control, but not nitrogen in nitrate (N-nitrate). The markedly increase of sulphur and nitrogen incorporated amino acids (S-amino acids and N-amino acids) was observed in both S-deficiency and S-deprivation treatments. The amount of nitrogen incorporated proteins (N-protein) was strongly decreased as sulphur availability while the amount of sulphur incorporated into proteins (S-protein) was not affected. A highly significant ($p{\leq}0.001$) relationship between S-sulphate and S-amino acid was observed whereas the increase of N-amino acids is closely associated with decrease of N-proteins. These data indicate that increase of sulphur and nitrogen incorporated into amino acids was from different nitrogen and sulphur metabolites, respectively