• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2001년도 추계학술대회논문집 I
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• pp.499-503
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• 2001

Fatigue behavior of reinforced concrete (RC) elements has been experimentally and analytical investigated. Fatigue behavior influenced by longitudinal reinforcement ratio, strength of concrete and load ratio P／sub u／／P／sub o／. The purpose of these studies is to propose an empirical formula for fatigue behavior on basis of experimental results. Also an analytical method to predict the crack propagation of RC beams has been developed based on the relationships between bond stress and slip.

• 한국시뮬레이션학회논문지
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• 제1권1호
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• pp.17-24
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• 1992

The capacity of the drilling process in Multi-Layer PCB fabrication can be affected by various process parameters determining material flows in the unit operations. The ratio of mass-lamination to pin lamination and the number of stacks as the most critical paramaters, among them, were chosen on the basis of exhaustive field evaluation to study their effects on the capacity of the process. The best alternative condition for maximum capacity of the process was selected by simulation of process.

• 대한화학회지
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• 제33권1호
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• pp.120-126
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• 1989

pH 0.0∼14.00 범위에서 styrylphenylsulfone 유도체들의 가수분해반응에 대한 반응속도론적 연구가 25$^{\circ}$C의 50% 메탄올-물속에서 자외선 분광법으로 이루어졌다. 반응속도식과 치환기 효과(${\rho}$=1.85(pH 7.0), ${\rho}$=1(pH 13.0))로부터, pH 11.0이상에서는 전형적인 Michael형의 친핵성 첨가반응, pH 9.0이하에서는 물분자에 의한 일반 염기촉매반응, 그리고 pH 9.0∼11.0사이에서는 이들 두 반응이 경쟁적으로 일어남을 제안하였다.

• 생명과학회지
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• 제8권4호
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• pp.410-415
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• 1998

HPLC 및 electrospary mass spectrum으로부터 L-L dipeptide의 존제하에서 pepsin은 hexapeptide인 L-S-pNF-Nle-A-OMe를 가수분해하여 가수분해물외의 새로운 생성물을 합성하는 것이 확인되었다. 이 생성물은 254nm에서 p-nitro-Phe 잔기를 포함하는 peptide였다. 실험결과로부터 E(L-S-pNF)와 L-L 사이의 acyl transpeptidation에 의해 L-S-pNF-L-L가 생성됨을 뒷받침한다. 이러한 transpeptidation 결과는 product 저해실험에 의한 결과에 기초한 것과는 반대로 L-S-pNF가 해리되기전에 Nle-A-L-OMe가 먼저 한다는 것을 보여준다. 그리고, electrospray mass spectrum 으로부터 위에서 검출된 새로운 펩티드에 해당하는 peak (MW 636.1)을 얻었는데, 이는 새 펩티드의 생성을 확실히 증명하는 증거이다. 한편, Nle-A-L-OMe 생성에 대한 solvent isotope effect는 1.736$\pm$0.121이며 L-S-pNF는 2.28$\pm$0.184 그리고 L-S-pNF-L-L의 생성에는 inverse isotope effect로서 0.576$\pm$0.045였는데, 이는 상기 생성물 해리 순서를 확인시켜 준다. D$_{2}$에서 transpeptidation은 더 빠르기 때문에 isotopically-sensitive단계는 Nle-A-L-OMe해리후에 존재하는 것을 알 수 있다. 본 실험결과는, Rebholz and Northrop$^{1)}$ 및 Cho등의 $^{2)} iso-mechanism이론의 타당성을 제시한다.

• 한국환경보건학회지
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• 제29권2호
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• pp.1-6
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• 2003

This paper reports on a pilot scale comparison of PACS coagulation with and without pH preadjustment. The pH of the water was adjusted with carbon dioxide and sulfuric acid. Process performance was assessed on the basis of total organic carbon(TOC), UV absorbance, turbidity and disinfection by-product(DBP) precursors. Coagulation pH appeared to be a determining factor for maximum NOM removal. The optimum coagulation pH in order to decrease TOC and turbidity were pH 7. Preadjustment of pH 7 increased TOC removal to as much as 43, 47 percent with sulfuric acid and carbon dioxide. Moreover, coagulation at pH 7 caused a reduction in UV$_{254}$, THMFP and HAAFP compared to the baseline coagulation. For preadjustment of pH 7 with carbon dioxide, the percentage of TOC, UV$_{254}$, THMFP and HAAFP shows the reduction rate of 3.8, 0.5, 4.8, 9.4％ comparing to the coagulation rendition using sulfuric acid. Acid addition to depress pH during coagulation decrease Langelier Saturation Index(LSI), potentially causing increase corrosion in water distribution systems. LSI for carbon dioxide and sulfuric acid at pH 6 was -2.3, -3.3. Therefore, carbon dioxide was more effective at controlling corrosion than sulfuric acid.

• 융합신호처리학회논문지
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• 제15권2호
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• pp.48-54
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• 2014

원소 ${\in}F(p)$에 대하여 두 종류의 기저함수가 알려져 있다. 통상적인 다항식 기저(polynomial bases)는 $\{1,{\alpha},{\alpha}^2,{\cdots},{\alpha}^{n-1}\}$로 이루어지고 이와 다르게 정규 기저(normal bases)는 $\{{\alpha},{\alpha}^p,{\alpha}^{p^2},{\cdots},{\alpha}^{p^{n-1}}\}$의 형태를 갖는다. 본 논문에서는 소수 p의 원소로 이루어지는 유한장 GF(p)상에서 n차원 벡터공간인 확대장 $GF(p^n)$을 이룰 수 있는 정규기저의 발생과 생성에 대하여 검토하고 정규기저를 기반으로 부호계열 발생알고리즘을 분석하여 발생기구성함수를 도출하였다. 차수 n=5와 n=7인 두 종류의 정규기저를 생성할 수 있는 정규다항식을 발견하고 부호계열 발생기를 설계 구성하였다. 마지막으로 Simulink를 이용하여 두 종류(n=5, n=7)의 부호계열 그룹을 발생시키고 발생된 부호계열간의 자기상관함수, $R_{i,i}(\tau)$와 상호상관함수, $R_{i,j}(\tau)$, $i{\neq}j$ 특성을 분석하였다. 이 결과로부터 정규기저를 이용한 부호계열 발생알고리즘의 분석, 그리고 부호계열 발생기 설계와 구성이 타당함을 확인하였다.

• 호남수학학술지
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• 제38권1호
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• pp.169-212
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• 2016

Entire functions have been investigated so popularly to have been divided into a large number of specialized subjects. Even the limited subject of entire functions is too vast to be dealt with in a single volume with any approach to completeness. Here, in this paper, we choose to investigate certain interesting results associated with the comparative growth properties of iterated entire functions using (p, q)-th order and (p, q)-th lower order, in a rather comprehensive and systematic manner.

• 보험의학회지
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• 제2권1호
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• pp.128-134
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• 1985

Circumscribed solitary pulmonary nodule is often founded on the plain chest P-A. Even if many study results of coin lesion have been reported by some scholars, it is still very difficult to judge whether the coin lesion is to be benign or malignant. In order to avoid unnecessary surgical treatment, it must be made an examination and analysis very carefully in advance. In the chest P-A, we can grasp the aspects of the site and size of lesion, marginal state of lesion, calcification, cavity, and the growth rate in comparison to follow-up chest P-A. On the basis of above-mentioned analysis, we have to judge whether it is benign or malignant, and decide the next examinations. And then the doctor make diagnosis definitely by the clinical history, plain chest P-A, tomography, bronchography, CT, variable laboratory findings.

• Bulletin of the Korean Chemical Society
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• 제26권4호
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• pp.585-588
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• 2005

Bipyridine and its derivatives have been widely used as the ligands in transition metal complexes. The proton affinities of pyridine derivatives were calculated using an ab initio quantum mechanical method (B3LYP with various double zeta and triple zeta basis sets) in combination with the Poisson-Boltzmann continuum solvation model. Van der Waals radii of the atoms in the heterocyclic rings for the solvation energy calculation were set to values determined to reproduce the $pK_a$ values of guanine and oxoguanine derivatives and that of chlorine was optimized to reproduce the experimental values of relating compounds. The $pK_a$ values for the heterocyclic ring compounds were in agreement with the experimental values with a mean unsigned error of 0.45 $pK_a$ units.

• Asian-Australasian Journal of Animal Sciences
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• 제6권2호
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• pp.191-195
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• 1993

The application of fertilizer P to Desmodium intortum at 40, 60 and 100 kg/ha resulted in the P content of the legume regrowth being 0.10, 0.13 and 0.16% on a dry matter basis. When the forages were fed alone to sheep in metabolism pens the corresponding voluntary intakes by sheep of the three forages were 27.3, 42.7 and $54.3g/W_{kg}{^{0.75}}$, respectively. Provision of additional P by rapid infusion into the rumen each morning before any fresh food was offered depressed the voluntary intake of all three feeds. It is suggested that the adverse effect of supplementary P was probably caused by an induced deficiency of either Ca or Mg and led to a reduction in microbial activity in the rumen.