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김종호,김종호,이제헌,임형택,방경은,이숙진,임순용,양승민 한국통신학회 2000 한국통신학회논문지 Vol.25 No.8
If the control system that works important job fails, economical loss occurred. Hence, to guarantee high reliability, it must be duplicated. In the case of traditional duplication mechanism, dedicated operating system with duplication functions were built. This required much development and maintenance cost. They can be saved, if we use commercial operating system and its development environment.This paper proposes a duplication mechanism for the system based on commercial 0S. The system that explained in this paper is BSC(Base Station Controller). The duplicated BSC system uses concurrent write memory for synchronization and VxWorks as an operating system. We propose how the task supporting duplication functions is executed without delay and preemption, how to synchronize standby's memory with active' s, and how to use concurrent-write memory easily with VxWorks' s partition. We also describe the takeover procedure when the active detects its hardware fault and when the standby recognizes the failure of the active.
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Emulsion型 液體膜에 의한 Toluene과 n-Hexane混合物의 分離
金鍾浩,鄭泰秀 成均館大學校 科學技術硏究所 1992 論文集 Vol.42 No.2
In the separation of toluene-n-hexane mixture by the emulsion-type liquid membrane, studied were the effects of the following factors on the separation factor : volume fraction of toluene in feed, surfactant concentration, volume ratio of solvent to feed and glycerol concentration. The separation was most effective at the volume fraction of toluene in feed of 0.3 and the contact time of 5 minutes and the separation factor decreased as the contat time increased. The separation factor decreased with increasing surfactant concentration and increasing contact time. When the volume ratio of solvent to feed was three, the permeation of toluene was most effective, and the sparation factor decreased as the contact time increased. The separation factor was most effective at the glycerol concentration of 30 weight percent.
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Sdoium Borohydride에 의한 Aldehydes, Ketones 및 Acid Chlorides의 환원반응
김종호,정덕상 慶熙大學校 1980 論文集 Vol.10 No.-
Sodium borohydride, in water or methanol solution, is an effective reagent for the conversion of aldehydes and ketones to the corresponding alcohols. Its properties are compared with those of litium aluminum hydride and it is shown to be superior in selective reductions. Acid chlorides are reduced to primary alcohols in non-aqueous media, but carboxylic acids, anhydrides, esters and nitriles are practically unaffected.
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Mitomycin C 處理에 依 한 根端細胞의 染色體異常
金宗鎬 慶北大學校 1967 論文集 Vol.11 No.-
Root tips of Allium Scorodoprasum var. viviparum were treated with mitomycin C 0.0005%, 0.0006% solution for one hour at 20℃ respectively and observed chromosomal aberrations in anaphase and telophase plates. The highest frequency of chromosomal aberrations such as breakage and bridge occured at 48 hours after treatment, and its rate to sum of anaphase and telophase observed was 15.58% in the solution of 0.0005% concentration; but it occured at 72 hours late after treatment and its rate was 20.25% in the solution of 0.0006% concentration. It was found that mitomycin C induced much chromosome breakage.
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水稻 雌性不給系統을 利用한 1代雜種의 雜種強勢에 關한 研究
金種昊 圓光大學校大學院 1985 學位論叢 Vol.14-2 No.-
Studies were made to understand heterosis value in yield, yield components, some agronomic characteristics, vegetative vigor, and dry matter production of four F₁rice hybrids which were crossed between cytoplasmic genetic male sterile lines, V 20 A and Z97A, and Korean restorer varieties, Milyang 46, and Suweon 287. Simultaneously experiments were conducted to clarify the several physiological aspects of the F₁rice hybrids, and to obtain the basic information on heterosis breeding under Korean conditions. These studies were carried out at the Honam Crop Experiment Station for two years of rice cropping season from 1983 to 1984. The F₁hybrids were planted in 30×l3cm spacing with one plant per hill. Treatments replicated three times consisted of four F₁hybrids, their parents, check variety, Suweon 294, and three nitrogen levels (12, 18 and 24kg/l0a). The results obtained are as follows : 1. In general, significant positive heterosis, heterobeltiosis and standard heterosis were observed in plant height. Compared with check variety, the F₁hybrids showed lower tillering ability, but the F₁hybrids were superior to midparent and better parent. The extent of both heterotic values in plant height and tiller number seemed to have no effect of nitrogen levels. 2. Significant positive heterosis and heterobeltiosis appeared in culm length and panicle length, while negative, neutral or slightly higher standard heterosis appeared in both of them. No effects were seen in nitrogen levels, but year variation was significant. 3. Significant positive heterosis, heterobeltiosis and standard heterosis were seen in spikelets per plant, and 1,000-grain weight. And also the significant heterotic values were observed in grain - straw ratio and harvest index. No effects were observed in year variation and nitrogen levels in the extent of heterotic value of spikelets per plant, but positive effects were seen in 1,000 -grain weight. Negative or neutral heterotic value was found in panicles per plant and filled grain ratio. 4. Significant positive heterosis, heterobeltiosis and standard heterosis for grain yield were found in F₁, rice hybrids, showing up 74%('84), 25% and 17% respectively. The nitrogen response of F₁hybrids were higher than that of better parent and check variety. Pattern of nitrogen response was almost similar to that of the better parent and check variety. Highest grain yield resulted from 18kg of nitrogen level per 10 a. No effects were seen on the grain yield in year variation and in nitrogen levels. 5. F₁hybrids showed that plant weight increased sharply at early growth stages, and indicated average 46% of heterobeltiosis over better parent 30 days after transplanting. 6. F₁hybrids were superior to their better parent values in LAI increase, CGR and dry matter production 15 days after heading, amounting to average 36%, 38% and 33% of heterobeltiosis value respectively. 7. There seemed to be negative relationships between grain yield per plant and dry matter increase during the vegetative growth(30 DAT-45 DAT), and that between grain yield and dry matter production 15 days after heading, but the difference was not statistically significant in F₁hybrids. 8. Significant positive correlations were found between grain yieid/plant and spikelets/plant of F₁hybrids in heterosis, heterobeltiosis and standard heterosis, and between grain yield /plant and 1,000 - grain weight in three of them, while lower correlations were found in panicles/plant and filled grain ratio. 9. It was revealed that there were higher direct effects of spikelet number per plant and 1,000-grain weight affecting grain yield in F₁hybrids through path analysis among the yield components, while those in better parents were found in spikelet number per plant and filled grain ratio. 10. In general, F₁hybrids showed that there were higher phenotypic and genetic correalations in spikelets per plant and 1,000 - grain weight, while in case of better parents, higher phenotypic and genetic correlations were found in spikelets per plant and filled grain ratio. ll. Compared with F₁hybrids to their parents in root activity, Z 97 A crosses were more active than V 20 A crosses. 12. F₁hybrid was superior to their better parent and check variety in chlorophyll content which showed tendency to increase with higher nitrogen applications. 13. The results indicated that higher photosynthetic efficiency was observed in F₁hybrid compared with better parent and check variety. 14. Taking into consideration the results which indicated positive heterotic value largely in spikelets per plant and 1,000-grain weight, and higher correlations between grain yield and the two characters with higher direct effects affecting grain yield, it can be suggested that heterotic high grain yield would result from the hybrid combination between parents which would bring about increase of spikelet number and grain weight.
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