• Microbiology and Biotechnology Letters
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• v.26 no.3
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• pp.232-237
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• 1998

A bacterial strain producing high levels of an extracellular ${eta}$-mannanase and intracellular ${eta}$-mannosidase and ${alpha}$-galactosidase was isolated from soil. The strain isolated was identified as a strain of Sporolactobacillus sp. and designated as Sporolactobacillus sp. M20l. Synthesis of ${eta}$-mannanase by Sporolactobacillus sp. M20l was induced by sucrose, maltose, or locust bean gum. The highest induction rate was obtained with 2% locust bean gum added to the culture medium as a sole carbon source. On the other hand, induction of ${eta}$-mannosidase was observed only with locust bean gum. The optimal media for the enzyme production were established as follows: for ${eta}$-mannanase; 2% locust bean gum, 0.5% peptone, 0.2% KH$_2$PO$_4$, 80 mg/l MgSO$_4$, and 8 mg/l ZnSO$_4$ (pH 6.0), and for ${eta}$-mannosidase; 2% locust bean gum, 0.5% yeast extract, 0.2% KH$_2$PO$_4$, 80 mg/l MgSO$_4$, and 8 mg/l ZnSO$_4$ (pH 5.0). The optimal culture temperatures for production of ${eta}$-mannanase and ${eta}$-mannosidase were found to be 37$^{\circ}C$ and 3$0^{\circ}C$, respectively. Under the optimal culture conditions, the production of ${eta}$-mannanase and ${eta}$-mannosidase reached the highest levels of 10.6 units/ml and 1.35 units/ml after 30 h and 24 h cultivation, respectively.

• MALSORI
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• no.31_32
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• pp.223-238
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• 1996

It is widely hewn that the Japanese alveolar nasal [n] is affected by adjacent vowels in most positions, that is, the variants of the alveolar [n] occur conditionally. The Japanese [n] is palatalized under the influence of vowel [i] or palatal [j]. In the articulation of 'に', for instance, the tip and sides of the tongue make wide contact with the palate. It is interesting to know how palatalization occurs and varies during the production in different contexts. In my presentation the actual realization of the palatalized alveolar nasal in different contexts is examined and clarified by considering the Electro-palatographic data and examining the articulatory feeling and auditory impression. As a result, palatalized [${\eta}$] occurs either word-initially- or inter-vocalically. [${\eta}$] in [${\eta}$i] and 'いに'[$i{\eta}$] has great palatality. When conditioned by [j], the [${\eta}$] in 'にゃ'[${\eta}$ja], 'にょ'[${\eta}jo$] and 'にゅ'[${\eta}jw$] has full palatality. In each sound the average number of contacted electrodes of the Electro-palatograph at maximum tongue-palate contact is 63 or 100% of the total. To summarize the experimental data, articulatory feeling and auditory impression, it can be concluded that 'the [n] followed by or hemmed in [i], [j] is a palatalized nasal [${\eta}$].

• Proceedings of the KAIS Fall Conference
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• 2008.11a
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• pp.423-426
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• 2008

에탄올아민(ETA: Ethanolamine)은 탄소, 질소, 산소로 이루어진 유기화합물로 각종 산업에서 널리 사용되는 물질이다. 이러한 ETA는 상온에서는 휘발성을 띠지만 산 염기의 평형상수가 9.4 이므로 그 이하에서는 양이온 형태로 존재한다. 또한 수중에 존재할 경우 COD 및 T-N을 유발하는 물질이므로 이를 제거해야 한다. 따라서 본 연구에서는 수중에 존재하는 ETA를 제거하기 위해 온도, pH, 내부압력에 따른 ETA 증발 특성을 조사하였다. ETA증발 초기에는 끓는점의 차이로 인하여 물이 먼저 증발하며 일정시간 경과 후 농축된 ETA가 급격히 증발하였다. 내부압력이 낮아짐에 따른 ETA 수용액의 끓는점은 낮아졌으며 내부압력이 160mmHg이하일 때 가열온도에 영향을 받지 않고 ETA는 전량 증발하였다. 대기압 상태에서 ETA의 증발량은 pH에 영향을 받지만 진공상태에서는 ETA의 부분압이 낮아져 그 영향력은 매우 적었다.

• Journal of the Korean Chemical Society
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• v.35 no.4
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• pp.410-413
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• 1991

A tripledecker sandwichcomplex, bis(${\eta}^5$-cyclopentadienyl)-${\mu}$-(${\eta}^6$-2,3-dialkyl-1,4-dimethyl-1,4-dibora-2,5-cyclohexadiene)dicobalt 1 was synthesized as a starting material. By the reaction of compound 1 with the excess 3-hexyne two kinds of sandwichcomplexes, cyclopentadienyl(${\eta}^6$-2,3-dialkyl-1,4-dimethyl-1,4-dibora-2,5-cyclohexadiene)cobalt 2 and cyclopentadienyl(${\eta}^6$-hexaethyl benzene)cobalt 3 were separated. The complex 3 was decomposed during purifying at RT to give a cyclization product of 3-hexyne, hexaethyl benzene.

• Journal of Life Science
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• v.8 no.5
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• pp.492-496
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• 1998

Intact measurement of leaf water content was attempted using the transmission of beta radiation. Prior to the experiments, two tested plants, rice and soybean, were grown in 1/5000a wagner pot. The moisure ratio of plant leaves were measured with the beta radiation transmission method using a G-M detector and $^{99}$ Tc as the beta ray sou-rce. Beta radiation transmission showed a tendancy to increase with the passage of time after leaf cutting. However, it showed a tendancy to decrease with water supply for the lack of water. A positive correlation was found between the leaf water content and beta radiation transmission. The mutiple regression analysis about leaf water content was obtained that the coefficient of partial regression for beta radiation transmission was much higher(rice; -0.863, soybean; -0.904) than that for specific leaf area(rice; 0.007, soybean: 0.004).

• Journal of the Korean Society for Heat Treatment
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• v.18 no.1
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• pp.18-23
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• 2005

Effect of cold rolling on microstructural changes has been investigated for a Zn-15%Al alloy to elucidate the reason for its work softening behavior. Fully annealed microstructure of the Zn-15%Al alloy is characterized by ${\eta}$ grains and (${\eta}+{\alpha}$) lamellar colonies, where ${\eta}$ and ${\alpha}$ are Zn-rich HCP and Al-rich FCC phases, respectively. The hardness decreases continuously with increasing cold rolling degree, exhibiting work softening behavior. It is revealed that during the cold rolling, (${\eta}+{\alpha}$) lamellar colonies gradually change into equiaxed ${\eta}$ and ${\alpha}$ grains due to dynamic recrystallization at room temperature, while pre-existing ${\eta}$ grains are only deformed without recrystallization. Furthermore, cold rolling causes the precipitation of dissolved Al solutes in ${\eta}$ grains. In view of these results, change of (${\eta}+{\alpha}$) phases from lamellar to equiaxed morphology, which results in structural softness and increase in equiaxed ${\eta}/{\alpha}$ grain boundaries with higher mobility, and deterioration of solution hardening by precipitation of Al solutes from ${\eta}$ grains, are thought to contribute to the work softening of Zn-15%Al alloy.

• Bulletin of the Korean Mathematical Society
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• v.51 no.2
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• pp.401-408
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• 2014

We establish a new approach for the sums of products of the Euler numbers by using the relation of values at non-positive integers of the representation of the multiple Hurwitz-Euler eta function in terms of the Hurwitz-Euler eta function.

• Korean Journal of Mathematics
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• v.6 no.1
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• pp.67-70
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• 1998

Let ${\eta}(\tau)=q^{1/24}\prod_{n=1}^{\infty}(1-q^n)$, where $q=e^{2{\pi}i{\tau}}$ and ${\tau}{\in}\mathbb{C}$. Then the transformation $$g(\tau)={\rho}\frac{\{\eta(\frac{\tau+1}{2})\eta(\frac{\tau+2}{2})\}^{16}}{\eta(\tau)^{24}}({\bar{{\rho}}{\eta}}(\frac{\tau+1}{2})^8+{\eta}(\frac{\tau+2}{2})^8)^2$$ is holomorphic for Im ${\tau}$ > 0, and has the property $$g(\tau+1)=g(\tau),\;g(-\frac{1}{\tau})={\tau}^{12}g(\tau)$$. (Theorem)

• Communications of the Korean Mathematical Society
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• v.26 no.4
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• pp.685-693
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• 2011

General framework for proximal point algorithms based on the notion of (A, ${\eta}$)-maximal monotonicity (also referred to as (A, ${\eta}$)-monotonicity in literature) is developed. Linear convergence analysis for this class of algorithms to the context of solving a general class of nonlinear variational inclusion problems is successfully achieved along with some results on the generalized resolvent corresponding to (A, ${\eta}$)-monotonicity. The obtained results generalize and unify a wide range of investigations readily available in literature.

• East Asian mathematical journal
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• v.24 no.1
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• pp.1-6
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• 2008

In this paper, we introduce a system of nonlinear variational inclusions involving (A, $\eta$)-monotone mappings in the framework of Hilbert spaces. Based on the generalized resolvent operator technique associated with (A, $\eta$)-monotonicity, the approximation solvability of solutions using an iterative algorithm is investigated. Our results improve and extend the recent ones announced by many others.