黃酸에 依한 Oxalic Acid의 熱分解에 關한 硏究

具哲會 釜山工業大學校 1982 論文集 Vol.23 No.2

Calcium Oxalate에서 Oxalic Acid를 製造하는 工程에서 Oxalic Acid가 黃酸에 의하여 分解할 가능성이 있으므로, 本 硏究에서는 Oxalic Acid가 黃酸에 의해 얼마나 分解되는가를, 각종 黃酸濃度 및 溫度의 變化에 따라 Oxalic Acid의 熱分解를 測定하였다. 그 結果 70℃, 1時間의 反應條件에서 黃酸 濃度 93.2%, 85℃, 1 時間의 反應條件에서 89.5%, 95℃, 1時間의 反應條件에서 83.1%에서 Oxalic Acid의 熱分解가 일어났으며, 95℃에서 反應時間을 2時間, 4時間으로 연장하여도 그 이하에서는 Oxalic Acid의 熱分解가 일어나지 않았다. 이것은 Oxalic Acid의 黃酸에 의한 熱分解는 1. 가열온도의 상승에 따라서 Oxalic Acid가 熱分解되는 黃酸의 濃度는 낮고 2. 一定溫度에서 Oxalic Acid를 熱分解시키는 黃酸 濃度에는 限界가 있다는 것을 나타낸다.

변환적 리더십이 임파워먼트에 미치는 영향에 관한 연구

구자경,유철종 효성여자대학교 산업경영연구소 1998 경영경제 Vol.16 No.-

All-Projection Method에 있어서 Masking Data에 關한 硏究

具哲會 釜山工業大學校 1986 論文集 Vol.28 No.2

Camera-Back Method에 있어서 Masking Data에 關한 硏究

具哲會 釜山工業大學校 1985 論文集 Vol.27 No.-

Following results about Y,M,C Mask are obtained by the Indirect-Screen Color Separation Method. We make use of experimental system which are in use for the student education. In the Camera-Back Method of reflection copy, the results are summerized as follows; MASK Kodak wratten filter No. Exp. time Dev. time A M B A-B range Mask No. Y 58 50sec. 4min. 30sec 0.80 0.49 0.25 0.55 -0.07 M 23A 20sec. 4min. 0.81 0.48 0.24 0.57 -0.09 47+1.0N D 25sec. C 23A 25sec. 4min. 15sec 0.83 0.51 0.23 0.60 -0.04 58 8sec.

網再現에 있어서 補助 露출에 의한 Tone 變化에 關한 硏究

具哲會 釜山工業大學校 1991 論文集 Vol.33 No.-

This is a experiment on the dot reproduction. We report the results of some measurements on the relationship of tone change with auxiliary exposure and discuss them in this paper. The results are shown in Figure 3, 4 and Table 1. When applying the results of the study to practical problems, It will be obtained satisfactory results.

間接 色分解에 있어서 Masking의 Data에 關한 硏究

具哲會,李相南 釜山工業大學校 1984 論文集 Vol.26 No.-

Following results about Y, M, C mask are obtained by the Indirect-Screen Color Separation Method. We make use of experimental systems which are in use for the student education. -------------------------------------------------------------------------------- MASK Kodak wratten filter No. Exp. time Dev. time A M B A-B range Mask. No. -------------------------------------------------------------------------------- Y 58 50 sec. 4min. 30 sec 0.80 0.49 0.5 0.55 -0.07 -------------------------------------------------------------------------------- M 23A 20 sec. 4min. 0.81 0.48 0.27 0.57 -0.09 -------------------------------------------------------------------------------- C 23A 25sec. 4mim. 0.81 0.51 0.23 0.60 -0.04 -------------------------------------------------------------------------------- In the Projection Method of transparency copy, the results are summerized as follow; ------------------------------------------------------------------------------- MASK Kodak wratten filter No. Exp. time Dev. time A M B A-B range Mask. No. -------------------------------------------------------------------------------- Y 58+0.3ND 45sec. 4min. 30sec. 1.10 0.70 0.18 0.92 0.12 -------------------------------------------------------------------------------- M 33+81EF+0.3ND 45sec. 6min. 1.09 0.71 0.18 0.91 0.15 -------------------------------------------------------------------------------- C 85B+81EF+1.0ND 35sec. 6min. 1.13 0.72 0.19 0.94 0.12 --------------------------------------------------------------------------------

多色 網點 印刷物의 色測定에서 濃度 測定 方法과 剌戟値 直讀 方法의 比較에 關한 硏究

具哲會 釜山工業大學校 1983 論文集 Vol.24 No.2

多色 結點 印刷物에서 色을 測定하는데는 여러가지 方法이 있는데, 본 論文에서는 濃度 測定法과 剌戟値 直讀的으로, 日本 Ink 化學株式會社에서 나온 SPACE Color New Apex-G Color Chart를 使用하여 두 方法의 測定 結果를 비교, 검토하였다. Process Ink인 Y,M,C, Bl을 10, 20, 30…90, 100%의 結點 面積 比率로 變化시켜 測定한 結果 다음과 같은 結論을 얻었다. 1. Y Ink는 가장 理想的인 Ink로 575mm 부근의 主波長을 가졌다. 2. M Ink는 다른 成分을 제일 많이 함유하고 있었다. 3. 原色 分解할 때에 Bl 版의 필요성이 확인되었다. 4. 色의 混合 效果는 M+Y의 混合 때 가장 效果가 좋았다.

Low-Z Particle Electron Probe X-ray Microanalysis를 이용한 2001년 서울시 대기 중 입자상 물질 분석

구희준,김혜경,노철언 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.6

Atmospheric aerosol particles collected in Seoul on four single days, each in every seasons of 2001, were characterized and classified on the basis of their chemical species using low-Z particle electron probe X-ray microanalysis (low-Z particle EPMA) Low-Z particle EPMA technique can analysis both the size and the chemical species of individual aerosol particles of micrometer size and provide detailed information on the size distribution of each chemical species The major chemical species observed in Seoul aerosol were aluminosilicate, silicon dioxide, calcium carbonate, organic, carbon-rich, marine originated, and ammonium sulfate particles, etc The soil originated species, such as alummosilicate, silicon dioxide, and calcium carbonate were the most popular in the coarse fraction, meanwhile, carbonaccous and ammonium sulfate were the dominant species found in the fine traction Marine originated species such as sodium nitrate was frequently encountered, up to 30% or the analyzed aerosol particles

高分子에 固定된 有機朱錫 觸媒에 의한 EV Copolymer의 合成

具哲會 釜山工業大學校 1995 論文集 Vol.37 No.-

It was intended to review the partial reduction of PVC by this polymer supported organotin catalyst. Thermal stability of EV copolymer obtained by reduction of PVC was also studied by using thermogravimetric analysis. Ethylene unit, polyene sequence of EV copolymer, was increased with the increase in the amount of reduction agent used in the partial reduction reaction, and their molar content reached a maximum of 23.74% in the EV copolymer when 3 mole % DVB crosslinked reduction agent was used. Intrinsic viscosities of partially reduced PVC by ST-DVB copolymer with immobilized tinhydride were not changed significantly with the variation of the amounts of catalysts added for the reduction of PVC. The molecular weight of the copolymer determined by gel permeation chromatography was about 1.41 × 105. The EV copolymer obtained by partial reduction of PVC using the polymer supported organotin catalyst, showed an increasing tendency of syndiotactic structure with the decrease in the amount of ethylene unit in the EV copolymer. Short and long polyene sequence affecting the heat stability were also examined by using 13C-NMR spectroscopy. The long polyene sequence in EV copolymer was found to be the most important factor for the thermal stability.

高分子에 固定된 有機 朱錫 觸媒의 合成

具哲會 釜山工業大學校 1994 論文集 Vol.36 No.-

In this work, the organotin immobilized metal catalyst which was supported by a polymer, was synthesized by chloromethylation, vinylation, hydrostannylation of polystyrenes. It was intended to examine its characteristics by IR, NMR spectroscopy and other instrumental analysis methods. It was found that the yield of bound polymer was decreased with the increase of divinylbenzene content in the feed. The yield reached about 82-94 percent. FT-IR absorption spectra of chloromethylated ST-DVB copolymer showed the absorption bands at 676, 1266cm??, for v?? and these peak intensities increased with degree of crosslinking upto 3 mole% of DVB content. The yield of the chloromethylated ST-DVB copolymers reached a maximum value of 96% when 3 mole % of DVB was involved in bound polymer. FT-IR absorption spectra of vinylated C-ST-DVB copolymer showed the absorption bands at 908, 988 and 1630cm??, for v??, v???, and C-Cl, respectively. It was found that the contents of vinyl group in bound polymers were in the range of 19.8-40.4% depending on the crosslinking degree. The extent of vinylation reached a maximum when 3 mole % DVB was crosslinked. It was also found that both the content of tinhydride in bound polymer and degree of crosslinking decreased with the increase of DVB monomer in the feed. Swelling ration of the bound polymer showed a maximum value when 3 mole % DVB was crosslinked in bound polymer.