Improvement of Thermoplastic Forming Ability of Ti–Zr–Ni–Cu Metallic Glass by Addition of Sn

Yeong‑Seong Kim,Woo‑Chul Kim,Won‑Tae Kim,Do‑Hyang Kim 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6

Ti–Zr–Ni–Cu metallic glass attracts an attention as a precursor of superelastic alloy that can be deformed into nm scalecomplex shapes. However, since the thermal stability of Ti–Zr–Ni–Cu metallic glass in the supercooled liquid region is quitelow, application of thermoplastic forming is limited. Therefore, in the present study, the effect of Sn addition on thermoplasticforming ability of Ti–Zr–Ni–Cu metallic glass has been investigated. Sn containing (Ti35Zr15Ni35Cu15)99Sn1 metallic glassexhibits longer incubation time before onset of crystallization than Ti35Zr15Ni35Cu15metallic glass, resulting in significantimprovement of thermoplastic forming ability. The crystallization behavior changes from three-dimensional growth of saturatednuclei to three-dimensional growth with constant nucleation rate with the addition of Sn. The overall activation energyfor crystallization of (Ti35Zr15Ni35Cu15)99Sn1 metallic glass is higher than that of Ti35Zr15Ni35Cu15metallic glass, indicatingthat the thermal stability of metallic glass is improved by addition of Sn. Because nuclei are continuously generated duringthe crystallization in (Ti35Zr15Ni35Cu15)99Sn1, the average grain size is much smaller than that in Ti35Zr15Ni35Cu15.

벼 乾沓直播栽培時 播種期가 乾物生産에 미치는 影響

朴栽成,朴成圭,李尙榮,洪性澤,池在浚,趙東三,孫錫龍 충북대학교 농업과학기술연구소 1999 農業科學硏究 Vol.16 No.-

This experiment was carried out to obtain indispensable information to establish comprehensive cultural method of rice in direct seeding on dry paddy at Chungbuk Agricultural Research and Extension Services. Effect of seeding date on dry matter production, yield components and yield were studied. Seeding on May 5 ensured the highest maximum number of tillers, while transplanting on May 20 gave the highest rate of effective tillers. Number of effective tillers was greater in the order of Hwajinbyeo, Hwaseongbyeo, Daekwanbyeo. Lengths of upper three leaves were increased at later seeding, but leaf width was not affected by seeding date. Ratio of leaf blade weight was higher in earlier seeding during 30 days before heading but was higher in later seeding during 30 days after seeding, and was higher in the order of Hwajinbyeo, Hwaseongbyeo, Daekwanbyeo. CGR, RGR and NAR were not significantly different among seeding dates during 30 days before heading, but were lower in later seeding during 30 days after seeding. LAR was not affected by seeding date during 30 days before heading, but was higher at seeding on May 5 in heading date and during 30 days after heading. Dry weight of leaf blade, leaf sheath and culm, ear and total biomass during 30 days before heading and heading were highest in May 5 seeding. Daekwanbyeo and Hwaseongbyeo in May 5 seeding and Hwajinbyeo in April 20 seeding brought the highest yield with greater number of spikelets, higher ripening ratio and greater 1,000 grain weight, and harvest index and grain/straw ratio were Increased at earlier seeding. There were significantly positive correlations between number of panicles per m2 and LAI at 30 days before heading and heading, dry matter weight of leaf blade and total mass at heading. On the other hand, there were significantly negative correlations between seeding date and ripened grain ratio. 1,000 grain weight and yield, and between 1,000 grain weight and leaf length of 2nd, respectively.

GC-ECD를 이용한 유기염소계 및 Pyrethroid계 농약 동시 분석법

김우성,이선화,김재이,정지윤,이명자,박영채,이영자,정성욱,이봉헌,박흥재 한국환경과학회 2003 한국환경과학회지 Vol.12 No.4

Pesticides were extracted from samples with 70% acetone and methylene chloride in order, and then cleaned up via open-column chromatography apparatus packed with florisil, and finally analyzed simultaneously the organochlorine and pyrethroid pesticides using GC(ECD). An ultra-2 fused silica capillary column was used to separate and identify the products. The resolution between the last isomeric peak of cypermethrin(59.987min) and the first isomeric peak of flucythrinate(60.043min) was not satisfactory. The last isomeric peak of fenvalerate(62.344min) and the first isomeric peak of fluvalinate(62.397min) were overlapped. Recoveries of soybean sample for the most pesticides were 73.3% to 102.4%. Detection limits were between 0.004 and 0.063 ㎍/㎎ when this method was used.

논증가치와 토포이의 의미론적 특성 연구

강성영(Seong Yeong Kang) 한국프랑스학회 1997 한국프랑스학논집 Vol.22 No.-

Une etude sur les caractristiques smantiques des valeurs argumentatives et des topol Kang Seong-Yeong La dernire dcennie a vu un intrt croissant pour les etudes de `$quot;la thorie de 1$quot;argumentation daps la langue$quot; de J.-C. Anscombre et O. Ducrot par contraste avec la pragmatique conversationnelle de 1$quot;Ecole de Genwe. Nous voudrions soutenir dans cet article que les valeurs argumentatives et les topoi, concepts clefs de la th~orie d`Anscombre et Ducrot, doivent tre analysis en termes smantiques, mime s$quot;ils font partie en principe des ph~nom8nes pragmatiques. Pour ce faire, nous aeons prsent d`abord dans ses grandes lignes la thorie d$quot;Anscombre et Ducrot. En deuxi~me lieu. 1`encontre de leur point de vue purement smantique. nous aeons prix 1`opinion praematique de J. Moeschler(1992: 1996) que I$quot;argumentation est un type particulier d$quot;infrsrences, savoir les inferences contextuelles, et en mime temps que, tel est le cas. condition de considrer les conclusions argumentatives comme implications contextuelles et les topo`i comme prmisses impliques. Le but ultime de notre travail est cependant de montrer exactement le fait que les valeurs argumentatives et les topoi se trouvent immanents la structure significative de la phrase sous 1$quot;aspect des orientations argumentatives pour les unes et des instructions argumentatives pour les autres. F. Rkcanati(1984) et J. Moeachler(1985) disent qu`il est nCcessaire d`admettre que les valeurs pragmatiques d$quot;un nonck peuvent dlsj tre inscrites au niveau santique, si elles sont lies des processus linguistiques conventionnelles par des formes linguistiques particulires qui en deviennent pour ainsi dire les marqueurs. Daprs leurs dires, nous aeons prsent les formes et structures linguistiques qui permettent de conventionnaliser linguistiquement les valeurs argumentatives et les topof: les oprateurs argumentatifs, les connecteurs argumentatifs, les topo`i pour les unes, et les oprateurs argumentatifs, les connecteurs argumentatifs, les proverbes. les lexiques pour les autres. Il en rsulte donc que nous pourrions leur attribuer le statut smantique malgr leurs caract~ristiques pragmatiques superficielles.

벼 무논골뿌림栽培時 播種期 및 立毛數가 生育 및 收量에 미치는 影響

洪性澤,朴栽成,朴成圭,李尙榮,池在浚,孫錫龍 충북대학교 농업과학기술연구소 1999 農業科學硏究 Vol.16 No.-

This study was conducted to establish the cultural techniques of the puddled-soil drill seeding of race (Oryza sativa L.), which is one of the efficient labor saving cultural methods, in the central part of Korea. Seoanbyeo was seeded at three times from April 10 to May 20 with the 20 day interval in 1994. The number of seedling stands per m2 at each seeding date were 50, 90, 130 and 170. The tillering characteristics, lodging characters, dry matter production, yield components and yield were investigated. The number of days to the maximum tillering stage was reduced at the later seeding date. It was 70, 55 and 25 days in seedings on April 10, April 30 and May 20, respectively. The critical effective tillering stage was also shortened at the delayed seeding. The higher the number of seedling stands was, the higher number of tillers, the shorter duration to the maximum tillering stage and the earlier critical effective tillering stage were resulted. The number of tillers was higher at the earlier seeding date. The number of tillers was increased in the order of 50, 90, 130 and 170 seedling stands per m2. The ratios of effective tillers were 53, 61 and 63% at seeding on April 10, April 30 and May 20, respectively. The ratios were not significantly different at April 10. But the ratios in seeding on April 30 and May 20 were reduced as the number of seedling stands was increased. The weight of stem base related to lodging was the highest with 2.01g/10 plants in the optimum seeding on April 30, while it was 1.59g/10 plants in the late seeding on May 20. It was also decreased as the number of seedling stands was increased. The dry weights at 30 days before the heading stage were increased at the later seeding, while the dry weight at the heading stage was the highest at seeding on April 30 which is considered as the adequate seeding time. The dry weights at 30 days before the heading stage were increased as the number of seedling stands was increased and they were increased up to 130 seedling stands per m2 at the heading stage. The length of panicle exsertion was shortened at the later seeding. The length of panicle exsertion was increased up to 130 seedling stands. but it was shorter at 170 seedling stands. The heading dates were later at seeding on April 30 and May 20 than at seeding on April 10. They were not remarkedly different among seeding dates at 50 seedling stands, it was earlier at the higher number of seedling stands over 90. The number of spikelets per panicle was decreased at the higher number of seedling stands. The ratio of ripened grains was higher at earlier seeding than at later seeding. It was not significantly different among the number of seedling stands at the same seeding time. Yields at seeding on April 30, April 10 and May 20 were 644, 624 and 551kg/10a, respectively. The seeding on April 30, the optimum seeding time, resulted the highest yield. Rice quality was decreased due to the increase of the green kerneled rice as the seeding date was delayed.

벼 무논골뿌림裁培時 播種期가 生育 및 收量에 미치는 影響

池在浚,朴裁成,朴成圭,李尙榮,洪性澤,孫錫龍 충북대학교 농업과학기술연구소 1999 農業科學硏究 Vol.16 No.-

This study was carried out to determine the optimum seeding date for the rice(Oryza sativa L.) cultivation of the puddled-soil drill seeding, which is one of the efficient labor saving cultural methods, at the central part of Korea. Namweonbyeo, Anjungbyeo and Ilpumbyeo were seeded on four dates from April 10 to May 25, 1994 with the 15 day interval in the paddy field. In order to examine the adequate seeding date, the growth characters, yield components and yields were investigated. The coleoptile emerged 1 or 2 days earlier in Namweonbyeo than in Anjungbyeo and Ilpumbyeo, and later seeding resulted earlier coleoptile emergence. The number of seedling stands were higher in the order of Namweonbyeo, Anjungbyeo and Ilpumbyeo, was increased at the later seeding and was 81 to 88 seedlings on April 10 seeding. The plant height, number of leaves, number of tillers and dry weight at 50 days after seeding of all three cultivars were higher at later seeding. Leaf area index(LAI) were higher in the order of Ilpumbyeo, Anjungbyeo and Namweonbyeo. LAIs at the heading stage, at 30 days after heading and at 30 days before heading were higher in that order. The dry matter weight at the 30 days before heading was higher in sheath and stem than that in leaf blade, while, at heading stage, it was higher in the order of sheath and stem, leaf blade and panicle. On the other hand, at 30 days after heading, it was higher in the order of panicle, sheath and stem and leaf blade. The number of panicles per m2 was greater in the order of Ilpumbyeo, Anjungbyeo and Namweonbyeo. The ratio of ripened grain was reduced as the later seeding date. Its ratio was higher in Namweonbyeo than in Anjungbyeo and Ilpumbyeo. Yield of Namweonbyeo was lower than those of Anjungbyeo and Ilpumbyeo. Yield was decreased as the seeding date was delayed. Namweonbyeo showed the highest yield at seeding on May 10, while Anjungbyeo and Ilpumbyeo showed at seeding on April 25. The seeding date was negatively correlated with the ratio of ripened grain. while the number of seedling stands was positively correlated with the number of panicle per m2.

온라인 게임을 위한 이 단계 주 메모리 데이터베이스 시스템

성영락 국민대학교 생산기술연구소 2003 공학기술논문집 Vol.26 No.-

In this paper, a main memory database management system for online games is proposed. An online game system is composed of several game servers and a single database server. Since all database operations are concentrated to the database server, the database server is a major bottleneck of online game systems. A main memory database management system employs RAM rather than hard disks as its storage media. Accordingly, the execution speed can be drastically enhanced. The proposed main memory database management system is composed of two layers: the game server main memory database management system and the database server main memory database management system. By using the proposed scheme, the communication cost between the database server and game servers as well as the disk I/O cost of the database server can be substantially reduced.

DEVS 형식론을 이용한 RAID 시스템의 시뮬레이션

성영락 국민대학교 생산기술연구소 2002 공학기술논문집 Vol.25 No.-

In this paper, a RAID level 5 system is modeled by using the DEVS formalism. The system consists of one MPU and two PCI buses. For accurate evaluation of RAID system performance, modeling of the PCI bus and MPU are crucial. In the PCI bus model, start and end of message transfer are precisely modeled to measure the bus transfer time. The MPU model specifies the RAID software algorithm as well as the hardware architecture. Several input patterns are applied for verifying the modeling results.

Candida albicans菌의 生育을 抑制하는 韓藥材 探索에 關한 硏究

성연수,한영환,이태균 동국대학교 경주대학 1995 東國論集 Vol.14 No.-

Thirty-six medicinal herbs and 14 prescribed herb medicines which have usually been used for treatment of reducing fever, purging intense heat, and detoxication were screened for antifungal activity against Candida albicans which causing Leukorrhea. Minimal inhibitory concentrations of water- and ethanol-soluble extracts of Hwangbaek (Phellodendron amurense) and Hwangkeum (Scutellaria baicalensis) were determined. The water-soluble extracts of Hwangyon (Coptis japonica), Hwangbaek (P. amurense), and Hwangkeum (S. baicalensis) showed antifungal activities against C. albicans. The water- and ethanol-soluble extracts of Hwangbaek (P. amurense) and Hwangkeum (S. baicalensis) showed antifungal activities. With the water-soluble extract of Hwangbaek (P. amurense) and Hwangkeum (S. baicalensis), minimal inhibitory concentrations (MICs) against C. albicans were 10 and 20㎎/ml, respectively. With the ethanol-soluble ones of Hwangbaek (P. amurense) and Hwangkeum (S. baicalensis), MICs were 5 ㎎/ml and 10 ㎎/ml, respectively. The prescribed herb medicines, sambohwan, showed antifungal activity against C. albicans.

시간적인 지역성을 이용한 실시간 태스크들의 전력을 고려한 스케줄링

성영락 국민대학교 생산기술연구소 2004 공학기술논문집 Vol.27 No.-

Many real-time tasks have a limited number of operation states which changes with temporal continuity. This paper proposes a novel dynamic voltage scaling algorithm, called TLDVS, for real-time tasks in order to exploit the temporal locality. TLDVS achieves significant energy savings while still preserving timeliness guarantees made by real-time scheduling. Time budgets for each task are divided into two parts. Then the task executes at the lowest attainable frequency/voltage level in the first part. If the task does not complete until the end of the first part, then the scheduler is invoked and increases the processor frequency and voltage to complete the remaining computation load with the remaining time budgets. Simulation results show that TLDVS provides up to 25% of additional energy savings.