• 한국작물학회지
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• 제27권2호
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• pp.155-162
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• 1982

본 시험은 적심의 시기와 정도를 달리하여 조기적심 체제확립과 그에 따른 품종의 반응을 구명코자 실시하였던 바 그 결과를 요약하면 다음과 같다. 1. 수확기의 전엽장 및 엽폭은 By 104, Nc 2326, Va 115순으로 컸고, 조기 천지할수록 길었으며, 주당엽면적 및 생엽중은 By 104, 조기 천지인 경우에 컸다. 2. 발뢰기 적심은 만기적심에 비하여 본 상엽의 엽장, 엽폭, 엽면적이 커서 증수되었다. 3. 엽면상대조도는 Va 115 품종에서 높았고 By 104는 낮았으며 만적일수록 수광상태가 좋았다. 4. 니코틴함량은 조기, 심지일수록 전질소는 조적일수록 전당함량은 Nc 2326, 만적일수록 높았다. 5. 수량은 By 104, 발뢰기 추엽1매 적심구에서 표준구(개화시, 추엽1매)에 비해 다소 높았으며, 대금은 3개 품종 공히 발뢰기 추엽1매 적심구가 높았다.

• 한국연초학회지
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• 제23권1호
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• pp.5-11
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• 2001

Experiments were conducted to evaluated the sucker control efficiency of several suckercides and their combinations for flue-cured tobacco in Korea. In 1999, Flumetralin(Prime+, P+), Butralin(B), Fatty alcohol(FA, n-decanol 85%), pottasium salt of maleic hydrazide(MH), tank mix of MH with P+ (MH·P+), and another tank mix of MH with FA(MH·FA) were applied after topping, respectively, then sucker number and sucker dry weight were investigated on the 30th and 50th day from treatment. Sucker number and dry weight were significantly lowered by P+, B, FA and MH·P+ applications compared with those of MH and MH·FA for both investigated periods. A significant reduction in sucker number and dry weight was observed in P+, B, and MH·P+ applications. FA treatment was not so much effective in sucker control as P+. In 1999 and 2000, several suckercides and tank mixes of their combinations were applied first at button stage and second after topping, respectively, to compare the effects of sucker control on yield, price index and chemical components of cured leaves. Compared to the standard method of FA 30x at button stage followed by MH40x application after topping(FA 30x + MH 40x), sucker number and dry weight decreased by [FA 30x (or P+ 1%] or [FA 30x(or B 1.5%) + MH 60x·B 1.5%] treatments, even at reduced MH levels. But yield, price index and chemical components of cured leaves were not differed among treatments.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 1998년도 추계학술발표회요약집
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• pp.103-103
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• 1998

• 한국연초학회지
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• 제9권1호
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• pp.27-33
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• 1987

This study was carried out to investigate the effect of cultural practices on the nicotine and sugar contents in flue-cured tobacco(NC82), and the relationship between them. Significant reduction I sugar content and ratio of total sugar to nicotine(ratio, S/N) were observed with increased fertilizer, lower topping height, late transplanting and decreased application of male hydrazide(MH). Significant increases were observed in nicotine content with increased fertilizer and lower topping height. A positive correlation was found between total sugar content and plant density. A negative correlation was found between nicotine and total sugar contents for 8-years. An increase of 1.0% nicotine in the cured leaf would result in a 4.8% reduction in total sugar. The most desirable contents were 2.7% for nicotine and 19.0% for total sugar(S/N=7).

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 봄 학술발표회논문집(II)
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• pp.505-512
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• 1998

The object of this study is investigated to flexural behavior of structural deck plate composite slabs using high-strength lightweight concrete. Test variables are concrete compressive strength (normal weight concrete 210kg/$\textrm{cm}^2$, lightweight concrete 270, 350kg/$\textrm{cm}^2$), topping concrete thickness (70, 75mm when span is 3.4m), deck plate depth (50, 75mm when topping concrete thickness is 70mm and span is 3.4m) and span(3.0, 3.4m). Test results are compared with current ACI Building Code(318-95). The test results are follows ; (1) a value of Ptest/Pcal is 1.27~1.39, (2) a mean value of $\delta$test/ $\delta$ACI is, 0.60 when deflection is reatched to maximam permissible computed deflection (L/360), and (3) ductility index are 3.61~6.85.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.167-172
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• 2001

Hollow core slabs generally have not been used for a bridge slab or a parking in Korea. In this study, high performance hollow core slabs, which has been the most thick one in domestic are re-designed and examined for practical use. Flexural tests were performed on four 315mm deep hollow core slabs to investigate adaptability for high vehicle live loadings and composite action with topping concrete. The precast slabs were reinforced with 10-l/2 inch dia-strands at the lower of slab and 4-l/2 inch dia-strands at tile upper of slab, and cast with 80mm deep topping concrete. Those tested hollow core slabs showed ductile failure behaviors which were conform to the current Ultimate Strength Design Method for a span of l0m up to the live load of 1, 000 kg/$m^2$.

• 한국연초학회지
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• 제14권2호
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• pp.144-150
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• 1992

This study was carried out to investigate the effect of yield and quality on the harvesting time and methods of stalk cutting in Burley Tobacco.3 harvesting methods and 4 harvesting times of stalk cutting were compared to priming. The yield and quality were high when cut the stalk after second priming in stalk curing. It was also desirable that cut the stalk after second priming in stalk curing. It was also desirable that cut the stalk on 30 days after topping for standard fertilization(N-P2O5-K2O= 17.5-17.5-35.0kg/10a) plot, and 30-35 days after topping for 30% increased fertilization.

• Elastomers and Composites
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• 제1권1호
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• pp.41-48
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• 1966

The physical properties of rubber coated fabrics, treated by means of spreading and topping process were studied. 1. The tearing strength of the rubber coated fabrics has shown decreasing tendency in comparison with fabric itself 2. Generally, the tearing strength is inversely proportional to the adhesion. 3. The value of hydrostatic pressure is in proportion to the density and tensile strength of the fabrics. 4. The topping process shows greater difference in adhesion initial and after water immersion than spreading process.

• 연구논문집
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• 통권27호
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• pp.75-86
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• 1997

Combined cycle power plant is a system where a gas turbine or steam turbine is used to produce shaft power to drive a generator for producing electrical power and the steam from the HRSG is expanded in a steam turbine for additional shaft power. Combined cycle plant is a one from of cogeneration. The temperature of the exhaust gases from a gas turbine ranges from $400^\circC$ to $600^\circC$, and can be used effectively in a heat recovery steam generator to produce steam. Combined cycle can be classed as a "topping(gas turbine)" and a "bottoming(steam turbine)" cycle. The first cycle, to which most of the heat is supplied, is called the topping cycle. The wasted heat it produces is then utilized in a second process which operates at a lower temperature level and is therefore referred to as a "bottoming cycle". The combination of gas/steam turbine power plant managed to be accepted widely because, first, each individual system has already proven themselves in power plants with a single cycle, therefore, the development costs are low. Secondly, the air as a working medium is relatively non-problematic and inexpensive and can be used in gas turbines at an elevated temperature level over $1000^\circC$. The steam process uses water, which is likewise inexpensive and widely available, but better suited for the medium and low temperature ranges. It, therefore, is quite reasonable to use the steam process for the bottoming cycle. Only recently gas turbines attained inlet temperature that make it possible to design a highly efficient combined cycle. In the present study, performance analysis of a dual pressure combined-cycle power plant is carried out to investigate the influence of topping cycle to combined cycle performance.

• 콘크리트학회논문집
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• 제14권2호
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• pp.156-163
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• 2002

우리나라에서 교량이나 주차장 슬래브용으로 중공 슬래브를 활용한 예는 거의 없었다. 본 연구는 국내에서 생산중인 중공슬레브의 길이가 가장 큰 고성능 중공슬래브를 재설계하고, 그 적용성을 검토한 것이다. 이를 위해 최대 깊이 315 mm인 고성능 중공슬래브에 대하여 12.7 mm 슬래브 하부강선 10개와 상부강선을 4개를 배근한 중공슬래브 80mm 토핑콘크리트를 타설한 4개의 실험체에 휨실험을 실시하여, 차량 등을 위한 고하중에서의 활용성과 슬래브의 합성작용에 대한 검토를 병행하였다. 이 실험에서의 중공슬래브는 10 m-경간 슬래브에서 설계활하중 1,000 kgf/$m^2$를 고려할 때 강도설계에 적합한 연성적 휨파괴 거동을 보여주었다. 또한 슬래브와 토핑콘크리트의 합성거동을 위하여 사용한 직사각형 전단키와 원형 전단키는 모든 단부에서 순수 휨파괴까지 어떠한 미세 균열도 발생하지 않았으므로, 누 종류의 키는 전단키로 충분한 내력을 발휘한 것으로 판단된다.