• 한국작물학회지
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• 제37권1호
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• pp.93-103
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• 1992

보리의 등숙향상을 위하여 등숙효율을 높일 수 있는 형질을 선발하고 파종기를 달리 하였을 때의 등숙과정 및 등숙관련 형질들 간의 관련성을 검토하고자 특성이 상이한 보리품종인 올보리, 강보리 및 수원18호를 공시하여 시험한바 그 결과를 요약하면 다음과 같다. 1. 파종기 차이에 따른 구성 요소중 단립면적당 수수와 입중이 비교적 민감한 반응을 보였으며 만기파종에서 수량 감소가 컸다. 2. 등숙과정에서 조기와 적기파종은 출수후 20-30일 사이, 만기 파종은 출수후 1-20일 사이에서 종실의 축적량이 각각 1.03-1.94mg / grain/day과 0.88～1.88mg / grain / day 으로 가장 왕성하였으며 입중이 최대에 달하는 시기는 조기 및 적기파종에서는 출수후 40일, 만기파종은 출수후 30일경 이었다. 3. 출수이후 종실의 수석 일실량은 1.20-1.66%/day 범위로 만숙 품종과 만기파종에서 증가된 것으로 볼 때, 수분일신량과 등숙속도와는 상호밀접한 관계가 있었으며 등숙과정중 수분일실량이 가장 많은 시기는 출수후 25-30일 사이로 종실의 발육량이 최대에 이르는 시기와 일치하였다. 4. 종실의 전당 함량은 출수직후부터 직선적인 증가를 보이다가 출수후 20일을 기점으로 점차 감소됨에 동시에 전분함량은 등숙이 완료될 때까지 계속 증가되었는데 품종간에는 올보리, 강보리, 수원18호 순으로 높게 유지되었으나 파종기간에는 일정한 경향이 없었다. 5. 입중과 등숙기간과는 높은 정의 상관(r=0.767$^{**}$ )관계가 있었으나 등숙기간중의 일평균 온도(r=-0.548$^{**}$ ) 및 적산 온도(r=-0.595$^{**}$ )와는 유의한 상관관계가 인정되었다. 품종보다 노후화 속도가 느려 습윤ㆍ고온처리를 하였을 때도 하배축신장이 뚜렷하게 컸다.은 내한유채가 86.7%로 가장 높았으며, 기타(mono, di-glyceride 및 free fatty acid) 는 13.3～17.4%로 나타났다.로 빠른 시일에 집중적인 연구가 필요하다고 본다.다. 4. 저온저장(4$^{\circ}C$, RH 50%)한 벼는 2년반 저장한 벼도 밥맛의 변화가 거의 없었다. 5. 1988년산 및 1989년산 일반계를 10분도와 12분도로 도정하였을 때 도정도에 따른 밥맛의 차이는 없었다.X>$CoO_x$는 $Co_3O_4$로 존재하고, 반응 전의 경우에는 이와는 다른 chemical state를 보여주었다. XRD 및 XPS 결과를 바탕으로, 촉매표면에 존재하는 $Co_3O_4$의 외부표면이 $Co_2TiO_4$와 $CoTiO_3$ 같은 $CoTiO_x$로 encapsulation되어 있는 모델구조를 제안할 수 있고, 이는 반응시간의 함수로 나타나는 촉매활성에 있어서 전이영역의 존재를 잘 설명할 수 있을 뿐만 아니라, XRD와 XPS에서 얻어진 촉매의 물리화학적인 특성을 잘 반영할 수 있다. 나타냈고, 골격근과 눈 조직에서 피루브산에 대한 LDH의 친화력이 상당히 크므로 LDH가 혐기적 조건에서 효율적으로 기능을 하는 것으로 사료된다.5) and "Cleanliness of clothes ＆ features" (p ＜0.05) of VIP ward were significantly higher than those of a general ward.tive to apply.아울러 고려(考慮)해야

• 한국작물학회지
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• 제38권5호
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• pp.405-412
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• 1993

벼와 피의 입모와 초기생육에 미치는 담수심의 영향을 구명하기 위하여 담수심 0, 7.5, 15.0, 22.5cm로 처리하여 파종부 8일 초엽장, 유근장 및 입모수를 파종후 35일 초장, 경수, 건물중 등을 조사한 결과를 요약하면 다음과 같다. 1. 담수심이 깊어질수록 벼의 초엽은 길어졌으나 유근장은 짧아졌고, 이들의 신장성이 가장 좋았던 품종은 Italico livorno이었고, 다음이 S201, A301, 화성벼, M202순이었다. 2. 입모율은 담수시이 깊어지면 벼와 피 다같이 떨어졌는데, 피는 담수시 입모율 감소가 심했고 유의성도 인정되었다. 3. 담수심이 깊어지면 벼의 초장은 길어졌으나 피는 짧아졌고, 경장은 다같이 감소하였는데 15cm이상 심수시 피의 생육은 극히 연약하였다. 4. 벼의 엽수는 담수심간은 차이가 없었고, 품종간에는 M202가 1엽정도 적었고, 그 외 품종들간에는 비슷하였다. 5. 지상부 및 뿌리 건물중은 벼는 담수심 7.5cm에서 가장 많았고, 다음이 0,15.0, 22.5cm 담수심 순이었으나 담수심간 유의성은 없었다. 피는 담수심 0cm에 비하여 담수심 7.5, 15.0, 22.5cm에서는 각각 지상부 건물중 65%, 87%, 94%, 뿌리 건물중 81%, 90%, 94%가 감소되어 침수에 따른 생육억제정도가 심하였다. 6. 충실도는 벼는 담수심간 유의성이 없었으나 피는 담수심 0, 7.5, 15.0, 22.5cm에서 각각 12.52, 5.44, 2.30, 1.30mg/cm로 담수심이 깊어짐에 따라 급격히 저하하였다. 7. 공시품종중 Italico livorno와 S201은 다른 품종들에 비하여 초엽장, 유근장 등이 높아 단수직파에 좋은 특성을 가진 품종으로 생각된다. 8. 각 품종내 피의 생육은 경수외에는 유의성이 인정되지 않아 대체로 파종후 35일까지는 벼 품종들과 피와의 경합은 크지 않았던 것으로 사료된다./TEX>는 큰 영향이 없음을 알 수 있었다.다.e 및 free fatty acid) 는 13.3～17.4%로 나타났다.로 빠른 시일에 집중적인 연구가 필요하다고 본다.다. 4. 저온저장(4$^{\circ}C$, RH 50%)한 벼는 2년반 저장한 벼도 밥맛의 변화가 거의 없었다. 5. 1988년산 및 1989년산 일반계를 10분도와 12분도로 도정하였을 때 도정도에 따른 밥맛의 차이는 없었다.X>$CoO_x$는 $Co_3O_4$로 존재하고, 반응 전의 경우에는 이와는 다른 chemical state를 보여주었다. XRD 및 XPS 결과를 바탕으로, 촉매표면에 존재하는 $Co_3O_4$의 외부표면이 $Co_2TiO_4$와 $CoTiO_3$ 같은 $CoTiO_x$로 encapsulation되어 있는 모델구조를 제안할 수 있고, 이는 반응시간의 함수로 나타나는 촉매활성에 있어서 전이영역의 존재를 잘 설명할 수 있을 뿐만 아니라, XRD와 XPS에서 얻어진 촉매의 물리화학적인 특성을 잘 반영할 수 있다. 나타냈고, 골격근과 눈 조직에서 피루브산에 대한 LDH의 친화력이 상당히 크므로 LDH가 혐기적 조건에서 효율적으로 기능을 하는 것으로 사료된다.5) and "Cleanliness of clothes ＆ features" (p ＜0.05) of VIP ward were significantly higher than those of a general ward.tive to apply.아울러 고려(考慮)해야 한다. 이것은 고무기술자(技術者)가 당면(當面)해야할 과제(課題)에 속(屬)하며 바람직 한것은 본장(本章)의 내용(內容)이 여러 상황하(狀況下)에서 당면(當面)한 문제(問題)에 대(對)해 어떻게 대처(對處)해 야 할지를 모르는 여러

• 한국대기환경학회지
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• 제19권6호
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• pp.701-717
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• 2003

The objective of this study was to extensively estimate the air quality trends of the study area by surveying con-centration trends in months or seasons, after analyzing the mass concentration of PM-10 samples and the inorganic lements, ion, and total carbon in PM-10. Also, the study introduced to apply the PMF (Positive Matrix Factoriza-tion) model that is useful when absence of the source profile. Thus the model was thought to be suitable in Korea that often has few information about pollution sources. After obtaining results from the PMF modeling, the existing sources at the study area were qualitatively identified The PM-10 particles collected on quartz fiber filters by a PM-10 high-vol air sampler for 3 years (Mar. 1999∼Dec.2001) in Kyung Hee University. The 25 chemical species (Al, Mn, Ti, V, Cr, Fe, Ni, Cu, Zn, As, Se, Cd, Ba, Ce, Pb, Si, N $a^{#}$, N $H_4$$^{+}$, $K^{+}$, $Mg^{2+}$, $Ca^{2+}$, C $l^{[-10]}$ , N $O_3$$^{[-10]}$ , S $O_4$$^{2-}$, TC) were analyzed by ICP-AES, IC, and EA after executing proper pre - treatments of each sample filter. The PMF model was intensively applied to estimate the quantitative contribution of air pollution sources based on the chemical information (128 samples and 25 chemical species). Through a case study of the PMF modeling for the PM-10 aerosols. the total of 11 factors were determined. The multiple linear regression analysis between the observed PM-10 mass concentration and the estimated G matrix had been performed following the FPEAK test. Finally the regression analysis provided source profiles (scaled F matrix). So, 11 sources were qualitatively identified, such as secondary aerosol related source, soil related source, waste incineration source, field burning source, fossil fuel combustion source, industry related source, motor vehicle source, oil/coal combustion source, non-ferrous metal source, and aged sea- salt source, respectively.ively.y.

• Progress in Superconductivity
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• 제10권2호
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• pp.139-143
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• 2009

We have fabricated a low-noise 61-channel axial-type first-order gradiometer system for measuring fetal magnetocardiography(MCG) signals. Superconducting quantum interference device(SQUID) sensor was based on double relaxation oscillation SQUID(DROS) for detecting biomagnetic signal, such as MCG, magnetoencphalogram(MEG) and fetal-MCG. The SQUID sensor detected axial component of fetal MCG signal. The pickup coil of SQUID sensor was wound with 120 ${\mu}m$ NbTi wire on bobbin(20 mm diameter) and was a first-order gradiometer to reject the environment noise. The sensors have low white noise of 3 $fT/Hz^{1/2}$ at 100 Hz on average. The fetal MCG was measured from $24{\sim}36$ weeks fetus in a magnetically shielded room(MSR) with shielding factor of 35 dB at 0.1 Hz and 80 dB at 100 Hz(comparatively mild shielding). The MCG signal contained maternal and fetal MCG. Fetal MCG could be distinguished relatively easily from maternal MCG by using independent component analysis(ICA) filter. In addition, we could observe T peak as well as QRS wave, respectively. It will be useful in detecting fetal cardiac diseases.

• Bulletin of the Korean Chemical Society
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• 제32권9호
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• pp.3281-3289
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• 2011

The materials composed of the 3d series transition metals are introduced into the hydrocarbon steam-reforming reaction in order to enhance the $H_2$ production and abruptly depress the catalytic deactivation resulting from the strong sintering between the Ni component and the ${\gamma}-Al_2O_3$ support. The conventional impregnation method is used to synthesize the Ni/3d series metal/${\gamma}-Al_2O_3$ materials through the sequentially loading Ni source and the 3d series metal (Ti, V, Cr, Mn, Fe, Co, Cu, and Zn) sources onto the ${\gamma}-Al_2O_3$ support. The Mnloaded material exhibits a significantly higher reforming reactivity than the conventional Ni/${\gamma}-Al_2O_3$ and the other Ni/3d series metal/${\gamma}-Al_2O_3$ materials. Particularly the addition of Mn selectively improves the $H_2$ product selectivity by eliminating the formation of $CH_4$ and CO. The $H_2$ production is maximized at a value of 95% over Ni(0.3)/Mn(0.3)/${\gamma}-Al_2O_4$(1.0) with a butane conversion of 100% above $750^{\circ}C$ for up to 55 h.

• 한국재료학회지
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• 제16권9호
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• pp.557-563
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• 2006

The electrolytic reduction of spent oxide fuel involves the liberation of oxygen in a molten LiCl electrolyte, which results in a chemically aggressive environment that is too corrosive for typical structural materials. So, it is essential to choose the optimum material for the process equipment handling molten salt. In this study, corrosion behavior of Inconel 713LC, MA 754, X-750 and 718 in the molten salt $LiCl-Li_2O$ under an oxidizing atmosphere was investigated at $650^{\circ}C$ for $72{\sim}216$ hours. Inconel 713LC alloy showed the highest corrosion resistance among the examined alloys. Corrosion products of Inconel 713LC were $Cr_2O_3,\;NiCr_2O_4$ and NiO, and those of Inconel MA 754 were $Cr_2O_3\;and\;Li_2Ni_8O_{10}$ while $Cr_2O_3,\;NiFe_2O_4\;and\;CrNbO_4$ were produced from Inconel 718. Also, corrosion products of Inconel X-750 were found to be $Cr_2O_3,\;NiFe_2O_4\;and\;(Cr,Nb,Ti)O_2$. Inconel 713LC showed local corrosion behavior and Inconel MA 754, 718, X-750 showed uniform corrosion behavior.

• 한국수소및신에너지학회논문집
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• 제7권2호
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• pp.157-164
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• 1996

The AB5-type metal hydride electrodes using $(LM)Ni_{4.49}Co_{0.1}Mn_{0.205}Al_{0.205}$(LM : Lanthaniumrich Mischmetal) alloy powders(${\leq}200$mesh) which were coated with 25wt% copper in an acidic bath were prepared with or without addition of 10wt% PTFE as a binder. Prior to electrochemical measurements, the electrodes were sintered at $40^{\circ}C$ for 1 and 2hrs in vacuum with Mm(mischmetal) and sponge type Ti getters. The properties such as maximum capacity, cycle life and mechanical strength of the negative electrode have been investigated. The surface analysis of the electrode was also obtained before and after charge-discharge cycling using scanning electron microscope(SEM). From the observations of electrochemical behavior, it was found that the sintered electrode shows a lower maximum discharge capacity compared with non-sintered electrode but it shows a better cycle life. For the both electrodes with or without addition of PTFE binder, the values of mechanical strength were obtained, and their values increased with increasing sintering time. However, there is little difference of discharge capacity for both electrodes.

• Bulletin of the Korean Chemical Society
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• 제25권5호
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• pp.687-693
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• 2004

Composite membranes with a titania layer were prepared by soaking-rolling method with the titania sol of nanoparticles formed in the sol-gel process and investigated regarding the vapor permeation of various organic mixtures. The support modification was conducted by pressing $SiO_2$ xerogel of 500 nm in particle size under 10 MPa on the surface of a porous stainless steel (SUS) substrate and designed the multi-layered structure by coating the intermediate layer of ${\gamma}-Al_2O_3$. Microstructure of titania membrane was affected by heat-treatment and synthesis conditions of precursor sol, and titania formed at calcination temperature of 300$^{\circ}C$ with sol of [$H^+$]/[TIP]=0.3 possessed surface area of 210 $m^2$/g, average pore size of 1.25 nm. The titania composite membrane showed high $H_2/N_2$ selectivity and water/ethanol selectivity as 25-30 and 50-100, respectively. As a result of vapor permeation for water-alcohol and alcohol-alcohol mixture, titania composite membrane showed water-permselective and molecular-sieve permeation behavior. However, water/methanol selectivity of the membrane was very low because of chemical affinity of permeants for the membrane by similar physicochemical properties of water and methanol.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.193-193
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• 2011

To obtain ceramic films, the sol-gel coating technique has been broadly used with heat treatment, but crack formation tend to occur during heat treatment in thick sol-gel films. We prepared PZT thin films by sol-gel method with single-step spin coating process. The PZT solution have been synthesized using lead acetate ($Pb(CH_3COO)_2$), zirconium acetylacetonate ($Zr(OC_3H_7^n)_4$), and titanium diisopropoxide bis(acetylacetonate) 75wt% in isopropanol ($Ti(OC_3H_7^i)_2(OC_3H_7^n)_2$) as starting materials and n-propanol was selected as a solvent. The poly(vynilpyrrolidone) (PVP) was added with 0, 0.25, 0.5, 0.75, and 1 molar ratios to control viscosity of solution. We investigated influence of the viscosity on thickness, microstructure, and electrical properties of final PZT films. Thermo-gravimetric analysis and differential scanning calorimeter (TGA/DSC) was carried out from room temperature to $800^{\circ}C$ in order to measure pyrolysis temperature. Structural characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Ferroelectric and dielectric properties were measured by RT66A (Radiant) and impedance analyzer (Agilent), respectively. The thicknesses of PZT films depended on incorporation of an excess amount of PVP. Finally, we obtained PZT films of good quality without crack formation via single-step spin coating.

• 한국분말재료학회지
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• 제20권6호
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• pp.467-473
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• 2013

This research presents a preparation method of dental components by metal injection molding process (MIM process) using titanium scrap. About $20{\mu}m$ sized spherical titanium powders for MIM process were successfully prepared by a novel dehydrogenation and spheroidization method using in-situ radio frequency thermal plasma treatment. The effects of MIM process parameters on the mechanical and biological properties of dental components were investigated and the optimum condition was obtained. After sintering at $1250^{\circ}C$ for 1 hour in vacuum, the hardness and the tensile strength of MIMed titanium components were 289 Hv and 584 MPa, respectively. Prepared titanium dental components were not cytotoxic and they showed a good cell proliferation property.