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한라산 주변에 발생하는 Karman Vortex Street 재현
권지혁(Kwon Ji-hyuk·Lee),이연원(Lee Yeon-won),김영덕(Kim Young-duk),박광열(Park Kwang-yul) 한국풍공학회 2006 한국풍공학회지 Vol.10 No.1
늦가을과 초본 사이 제주도 후면에 Karman vortex street가 발생한다. 이러한 vortex가 발생하기 위해서는 기온 역전층과 5 ~ 13 m/s의 지속적인 바람이 필요하다는 것을 밝히기 위한 많은 연구들이 있었다. 이러한 vortex clouds는 발생 후 주 풍향의 방향을 이동하게 된다. Karman vortex street는 기상학에서 매우 흥미로운 주제이다. 본 연구에서는 LES 난류 모델을 이용하여 Karman vortex street에 관한 해석을 수행하고 수치해석을 통해 얻은 결과와 기상 데이터가 일치함을 보였다. From late autumn to the beginning of the spring, the phenomena of the Karman vortex street have been frequently observed in the wake of Mt. Halla in the Jeju island. Some researches revealed that the necessary conditions for development of these vortex clouds are a strong low-level inversion of temperature and a persistent wind speed of 5 to 13m/s. After the cloud is formed, the vortex clouds are shed from alternating sides of Jeju island and then move downwind with main airflow stream. The Karman vortex street in the wake of the Jeju island was one of the interesting topics in meteorology. In this study, CFD using LES turbulence model was developed to investigate the Karman vortex street and the results of CFD showed a good agreement with weather data.
수박 덩굴마름병 저항성 판별을 위한 SNP 표지인자 탐색
이혜은,홍종필,서혜영,허윤찬,안율균,김진희,김도선 忠北大學校 農業科學硏究所 2015 農業科學硏究 Vol.31 No.2
:Watermelon (Citrullus lanatus) is an important vegetable crop in the world and contains various health promoting compounds including many antioxidants such as lycopene and beta-carotene. Genetic diversity of cultivated watermelon is very narrow, which is one of major factors limiting the improvement of watermelon breeding program. Gummy stem blight (Didymella bryoniae (Auersw.)) is one of the most destructive diseases and causes crown blight, defoliation and fruit rot, resulting in severe production loss in watermelon. Single nucleotide polymorphisms (SNPs), important molecular markers for genetic studies are frequent sequence variation in the plant genome. This study was performed to develop SNP markers related to gummy stem blight resistance from three watermelon lines, one susceptible and two resistant to gummy stem blight. Of them, 22 SNP primers which were sequence information on SNPs derived from comparing a resistant and susceptible line was used for high resolution melt analysis. A total of 14 candidate SNP primers were detected melt temperature difference. These SNP primers can be useful for developing disease resistance-related markers and, therefore, beneficial to watermelon breeding program.
최연옥,이열선,서진연,한승조,조금배 조선대학교 동력자원연구소 1997 動力資源硏究所誌 Vol.19 No.1
A complete computerized system for the characterization and performance testing of photovoltaics(PV) modules under natural sunlight and ambient condition was designed. I-V characteristics of PV module provides on essential diagnostic means in assessing the performance and internal cell parameters of PV module depends on its basic materials, manufacturing technology and operating environmental conditions. I-V curves derived from PV modules refect to a large extent the physical properties and their expected performance. In this paper, Electrical performance measurement and evaluation methods for solar cell module by MOSFET variable Load were studied. Also, Mathematical model and theory of solar cell associated with the photovoltaic effect has been discribed.
김상녕,이종원,오율권,장완호 慶熙大學校 1991 論文集 Vol.20 No.-
During midloop operation of nuclear power to prevent the residual heat removal system from failure due to air entrainment of free surface vortex in the piping system a set of simulating experiments was performed. Through these experiments, a relation between the nondimensionalized numbers, such as submergence H/d. Froude number, Reynolds number, was found. However, the effect of the Reynolds number is not so dominant as that of the Froude number. It was also found that the boundary conditions of the free surface, that is, the perturbation of the free surface due to opening of closing pump and valves have significant effects on the free surface vortex. Futhermore a modified inlet device which reducer type with vortex breaker has strongly been recommended for the prevention of air entrainment.
한지형 잔디의 조성시기, 초종 혼합 비율이 잔디 피복에 미치는 영향
심규열(Gyu Yul Shim),김창수(Chang Soo Kim),이성호(Seong Ho Lee1),주영규(Young Kyoo Joo) 한국잡초학회·한국잔디학회 2004 Weed & Turfgrass Science Vol.18 No.4
This study was conducted to find out the effect of sodding and seeding time and rate of seed mixtures on the establishment of cool-season turfgrasses by evaluating the turf coverage rates for two years.<br/> In fall planting, the required establishment period of full coverage(100%) was 1.5 months with a rolled turf sodding(Kentucky bluegrass 100%, Kentucky bluegrass 80%+Perennial ryegrass 20%). The 100% turf establishment was achieved in 7 months with Perennial ryegrass 100%, and 7.5 months by seeding with Kentucky bluegrass 100%(KB100), Kentucky bluegrass 80%+Perennial ryegrass 20%(KB80+PR20), Kentucky bluegrass 70%+Perennial ryegrass 30%(KB70+PR30).<br/> In spring planting, the establishment periods for sod with KB100 or KB80+PR20 were taken one month. However, in the case of seeding, the establishment periods were 3 months, 3.5 months, 3.5 months and 4 months with PR100, KB80+PR20, KB70+PR30, and KB100, respectively. Comparing the turf establishment vigor between fall and spring planting, the vigor was higher in spring planting than in fall planting in both sodding and seeding.<br/> In the case of spring planting, the most proper time for turf establishment was tested on April, May, and June trials. The effect was significant in establishment vigor. The result showed highest on April planting. On May and June trials, establishment vigors were decreased gradually. As the mixture rate of PR increased, ryegrass, establishment vigor was decreased with the rates. These results indicated that perennial ryegrass has relatively less tolerant to summer heat than Kentucky bluegrass.<br/> Number of shoots in 95 days after seeding was higher in KB100 by 16,600 per ㎡ than in PR100 by 12,400 per ㎡, while the lowest number showed in KB50+PR50 by 3,300 per ㎡. Those in KB80:PR20, KB70:PR30 were 6,700 and 4,900 per ㎡, respectively. The ratios of tillers according to mixture rates between Kentucky bluegrass and perennial ryegrass were KB80:PR20=87:13, KB70:PR30=78:22, and KB50:PR50=48:52.<br/> According to results in this study, ideal seeding time might be spring (April) than in fall (September), and proper mixture rate was 80% of Kentucky bluegrass with 20% of perennial ryegrass.
시나리오 역할 게임을 통한 신속 시스템 설계/검증 방법 : 패키지 응용 시스템을 대상으로 for Package Based System Implementation
예도경,이용재,강두호,최열현 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1
Recently, many enterprises wish to preoccupy competitive positions in the market by motivating themselves towards CALS(Commerce At Light Speed), and try hard to achieve system implementation with the use of new concept-based backbone systems such as ERP(Enterprise Resource Planning) or ERP(Enterprise Resource Planning). However, unfortunately there is an inevitable discrepancy during implementation period between package vendors and customers due to lack of clear methodology and misunderstanding about system. In some cases, consensus on partially verified system design invokes customers’ continuous change demands and often it tends to result in unnecessary project delays. PDM application system implementation project of the company L has been studied here to solve these sorts of problems. The major yields of this work are achievement of a willing approval from customers and rapid system design under a time-limited and conceptually defined project scope, and finally, through fully verified system design, we were able to reach successful system implementation.
Crack-Release Transfer Method of Wafer-Scale Grown Graphene Onto Large-Area Substrates
Lee, Jooho,Kim, Yongsung,Shin, Hyeon-Jin,Lee, ChangSeung,Lee, Dongwook,Lee, Sunghee,Moon, Chang-Yul,Lee, Su Chan,Kim, Sun Jun,Ji, Jae Hoon,Yoon, Hyong Seo,Jun, Seong Chan American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>We developed a crack-release graphene transfer technique for opening up possibilities for the fabrication of graphene-based devices. Graphene film grown on metal catalysts/SiO<SUB>2</SUB>/Si wafer should be scathelessly peeled for sequent transferring to a target substrate. However, when the graphene is grown on the metal catalyst on a silicon substrate, there is a large tensile stress resulting from the difference of the coefficient of thermal expansion in the catalyst and silicon. The conventional methods of detaching graphene from metal catalysts were found to induce considerable mechanical damage on graphene films during separation processes including metal wet etching. Here we report a new technique wherein bubbles generated by electrolysis reaction separate thin metal catalysts from the SiO<SUB>2</SUB>/Si wafer. The dry attachment of graphene to the target wafer was processed utilizing a wafer to wafer bonding technique in a vacuum. We measured the microscopic image, Raman spectra, and electrical properties of the transferred graphene. The optical and electrical properties of the graphene transferred by the bubbles/dry method are better than those of the graphene obtained by mechanical/wet transfer.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am502565z/production/images/medium/am-2014-02565z_0005.gif'></P>
Effect of Porous Graphite for High Quality SiC Crystal Growth by PVT Method
Lee, Hee Jun,Lee, Hee Tae,Shin, Hee Won,Park, Mi Seon,Jang, Yeon Suk,Lee, Won Jae,Yeo, Im Gyu,Eun, Tai Hee,Kim, Jang Yul,Chun, Myoung Chul,Lee, Si Hyun,Kim, Jung Gon Trans Tech Publications, Ltd. 2015 Materials science forum Vol.821 No.-
<P>The effect of the porous graphite plate above the source material on properties of silicon carbide (SiC) crystals grown by Physical Vapor Transport method has been investigated. The porous graphite plate was inserted on source powder to produce a more C-rich for the polytype stability of 4H-SiC crystal and a uniform radial temperature gradient. The dendrite structure obtained from SiC source powder in the crucible with porous graphite plate was more densely formed than that in the conventional crucible. The crystal quality of 4H-SiC single crystals grown in porous graphite inserted crucible was revealed to be better than that of crystal grown SiC crystals in the conventional crucible.</P>