• Plant Breeding and Biotechnology
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• 제1권1호
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• pp.1-8
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• 2013

Low-temperature stress is an important factor controlling the growth and development of rice (Oryza sativa L.) in temperate region. In this study, a molecular linkage map consisting of 136 SSR markers was employed to identify QTL associated with cold tolerance at the seedling stage. 80 recombinant inbred lines (RILs) from an intersubspecific cross between Milyang23 (O. sativa ssp. Indica) and Hapcheonaengmi3, a japonica weedy rice and the parents were evaluated for leaf discoloration and SAPD value of seedlings. Rice plants were grown for 15 days in the low-temperature condition (13/20℃ day/night) and the control condition (25/20℃ day/night) in the growth chamber. The degree of leaf discoloration showed a highly significant correlation with the SPAD value in the low-temperature plot (r = -0.708, P < 0.0001). A total of four QTLs for SPAD were identified and the phenotypic variance explained by each QTL ranged from 5.4 to 16.0%. Two QTLs detected in the control condition were located on chromosomes 2 and 5, respectively. Two QTL on chromosomes 1 and 4 were detected at the low-temperature condition and Hapcheonaengmi3 alleles increased the SPAD values at these loci. Substitution mapping was conducted to delimit the position of qSPA-4 using introgression lines derived from the same cross. Results indicated that qSPA-4 was located in a 810-Kb region flanked by RM16333 and RM16368. The results indicated that Hapcheonaengmi3 contains QTL alleles that are likely to improve cold tolerance of Indica rice.

• Journal of Information Processing Systems
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• 제7권1호
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• pp.75-84
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• 2011

The enhanced pyramid graph was recently proposed as an interconnection network model in parallel processing for maximizing regularity in pyramid networks. We prove that there are two edge-disjoint Hamiltonian cycles in the enhanced pyramid networks. This investigation demonstrates its superior property in edge fault tolerance. This result is optimal in the sense that the minimum degree of the graph is only four.

• 한국식물병리학회지
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• 제1권2호
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• pp.128-135
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• 1985

국내 사과산지 4개처에서 푸른곰팡이 병균 Penicillium expansum을 분리하여 각종 살균제에 대한 반응을 조사하였다. 일반적으로 균의 약제내성은 지역간에 차이가 적었으며 약제의 종류 및 농도에 의한 차이는 컸고 봄균주가 자랄 수 없는 고농도에서도 가을균주는 생장하였다. 균사생장에 대한 살균제의 $ED_{50}$ 및 $0.1{\mu}g\~41.7{\mu}g/ml$ 및 $100{\mu}g\~2,250{\mu}g/ml$로서 저장고 및 과수원에서 분리한 균의 억제효과가 높고 균의 내성이 낮았으며, captafol, captan, iprodione, mancozeb이 $2.6{\mu}g\~750{\mu}g/ml$ 및 $638{\mu}g\~40,500{\mu}g/ml$로서 약효 및 균의 내성이 중도였고, chlorothalonil folpet, oxidong, propineb, triademefon이 $27.8{\mu}g\~8,354{\mu}g/ml$ 및 $2,625{\mu}g\~150,357{\mu}g/ml$로서 효과가 낮고 균의 내성이 높았다. 포자형성 억제효과는 균사생장 억제효과와 같은 경향을 보였으며 포자발아 억제효과는 ployoxin 및 triademefon을 제외하고는 반대의 경향을 보였다.

• Journal of Yeungnam Medical Science
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• 제9권1호
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• pp.121-129
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• 1992

STZ투여 전후 2주씩 4주간의 규칙적인 운동 부하가 당뇨흰쥐의 골격근 당섭취와 당내성에 미치는 영향을 알아보기 위하여 Sprague-Dawley종 수컷 흰쥐를 사용하여 soleus근의 당섭취를 시험관에서 $^3H$-3-O-methyl-glucose의 섭취로 추적하였으며 정맥으로 당을 부하 (0.5g/kg BW)하여 당내성을 평가한 본 실험의 결과를 요약하면 다음과 같다. STZ의 투여로 대조군에 비하여 공복시 혈당과 유리지방산이 증가하고 인슐린 농도, soleus근의 당섭취, 인슐린에 대한 예민도와 반응도, 및 근 glycogen농도는 감소하였으며 내당능이 저하하였다. STZ 투여 흰쥐에서 4주간의 규칙적인 운동으로 인한 변화로 안정군에 비하여 공복시 혈당이 감소하고 soleus근의 당섭취와 인슐린에 대한 반응도 및 근glycogen 의 농도가 증가하였으며 유리지방산의 농도가 감소하는 경향을 보였다. 그러나 인슐린 농도는 차이가 없었으며 당내성은 개선되지 않았다. 위의 결과로 보아 4주간의 운동은 STZ 투여후 당뇨 흰쥐 발생율에는 영향을 미치지 못하였으나 골격근의 인슐린 반응도는 향상시켰으며 공복시 혈당도 감소시키는 효과를 나타내었다. 그러나 저하된 내당능은 골격근의 인슐린 반응도가 향상되었음에도 불구하고 개선되지않은 것으로 사료된다.

• 한국CDE학회논문집
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• 제15권4호
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• pp.253-260
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• 2010

This paper presents algorithms for computing offsets of freeform curves. The approach first divides the original curve into several segments at the inflexion points. Based on the obtained new control polygon and its offsets, quadratic trigonometric splines are constructed to approximate the offset curves. Finally, the shape parameter value of trigonometric spline is determined to satisfy the required tolerance. The degree of the output curve is two, independent of the original curve's degree. Because of the great controllability, the proposed method can generate a completely overestimating offset curve by adjusting the value of the shape parameter, which guarantees no overcutting in NC machining. Furthermore, it also produces the lowest number of control points compared with other works.

• 대한기계학회논문집
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• 제18권11호
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• pp.2846-2859
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• 1994

This work deals with kinematic analysis of fault-tolerant 3 degree-of-freedom spherical modules which have force redundancies in its parallel structure. The performance of a redundantly actuated four-legged module with no actuator failure, a single actuator failure, partial and half failure of dual actuator are compared to that of a three-legged module, in terms of maximum force transmission ratio, isotropic characteristics, and fault-tolerant capability. Additionally, a system with an excess number of small floating actuators is considered, and the contribution of these small actuators to the force transmission and fault-tolerant capability is evaluated. This study illustrates that the redundant actuation mode allows significant saving of input actuation effort, and also delivers a fault tolerance.

• 한국식물학회:학술대회논문집
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• 한국식물학회 1999년도 Proceedings of the 17th Symposium on Plant Biology Environmental Stress and Photosynthesis
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• pp.68-82
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• 1999

CHilling tolereance of plants are closely correlated with the degree of fatty acid unsaturation of membrane lipids. We studied the effects of low-temperature photoinhibition on the photochemical efficiency of photosystem II in terms of fatty acid unsaturation of thylakoid membranes lipids isolated from chilling -sensitive plants and chilling -resistant ones. To directly test the chilling tolerance of photosynthetic machinery in relation to membrane lipids, we further compared wild type tobacco plants with that of transgenic tobacco plants, in which the sensitivity to chilling had been enhanced by genetic modification of fatty acid unsaturation of chloroplast membrane lipids. The transgenic tobacco plants were found to contain reduced levels of unsaturated membrane fatty acids after being transformed with cDNA for glycerol-3-phophate acyltransferase from squash. The functional integrity of photosystem II during and recovery of photosynthesis from low-temperature photoinhibition will be discussed in connection with the degree of fatty acid unsaturation of chlorophast membranes lipids.

• 한국산업융합학회 논문집
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• 제22권6호
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• pp.627-635
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• 2019

In this study, we developed for processing complex features using CAM software that satisfies precision for example practice and related qualification tests suiTable for CNC training purposes. In addition, functions such as location control, speed control, and processing path generation, which are the main functions of CNC machining machines, were constructed using small equipment parts, servo motors, inverters, general purpose PCs, and commercial NC software and researched with the goal of developing low-cost education equipment. In the static accuracy inspection, the degree of machine when measuring the parallelism of the X, Y and Z axes and the vibration of the main shaft did not reach the allowable value. However, we have obtained a finished product that satisfies the CNC machine book sample shape machining, detailed functions of the position control function of the CNC machine tool, linear interpolation function, circular interpolation function, and tool offset function. In the qualification test shape processing, a shape with a degree of 1/100 mm was processed to obtain position accuracy that satisfied the tolerance.

• The Korean Journal of Pain
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• 제5권1호
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• pp.29-36
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• 1992

This study was objected to evaluate clinical progressions about both the degree of pain relief and the occurrence of morphine tolerance while the epidural analgesia with low dose of morphine, bupivacaine and antidepressant continued repeatedly at every 5 day intervals of the constant-rate infusion(0.5 ml/hr, 60 ml capacity). The subjects were divided to 56 cancer and 36 non-cancer patients who failed to respond to palliative treatments. Before the relief of pain, the pain severity was moderate(10%) and severe(90%). The dose escalation of morphine noted to 11(20%)patients in cancer pain and to one(5%) case only in non-cancer. During the epidural analgesia, the effect of pain relief was moderate(11%) and good(89%). It suggest that the morphine tolerance may be reduced to some degree such as an initial minimum dose of epidural morphine with local anesthetic and antidepressant should be adjusted on an individual basis using the constant-rate infusor, even though rapid dose escalation occurrs in some patients who the diseases progress over a short period of time.

• Journal of Ginseng Research
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• 제26권3호
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• pp.159-164
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• 2002

고려인삼의 적변내성 계통을 선발하기 위하여 39계통을 포장시험에 공시하여 적변지수가 낮아 적변에 강한 건전계통(LR) 7계통과 적변지수가 높아 적변에 약한 적변계통(HRL)7계통을 선발하였다. 적변내성 인삼 선발을 위한 지표성분으로 무기성분의 가능성을 검토하기 위하여 I(건전계통군의 건전삼과 적변계통군의적변삼 비교), II(건전계통군의 건전삼과 적변삼 비교), III(적변계통군의 건전삼과 적변삼비교), IV(적변삼의 건전계통군과 적변계통군 비교), V(건전삼의 건전계통군과 적변계통군 비교) 5개 조합으로 구성하여 부위별로 무기성분 함량을 비교하였다. 계통군 및 적변지수별 무기성분 함량이 중심주 및 피층조직에서는 유의성이 없었으며, 지세근 조직에서도 일정한 경향이 없었다. 각 계통군내 비교에서 적변인삼은 건전인삼보다 표피조직에서 Fe, Na및 Al함량이 높았다. 표피조직에서 적변계통군(HRL)은 건전계통군(LRL)보다 적변삼이나 건전삼 시료 모두에서 Fe, Al함량이 높아 적변내성 계통 선발 지표성분으로 활용 가능성을 제시한다.