We tried to develope a desulfurization sorbent using eggshell for recycling, practicability, and economic development. The calcination character of the eggshell was examined by thermal gravimetric analysis and qualitative-quantitative character by X-ray diffractometer(XRD) and scanning electron microscope(SEM). The calcination was occurred easily in the case of eggshell and its form was changed from calcite(CaCO_3) to lime(CaO). The grain and pore sizes of the calcined sample after base-treatment were larger and more crystallic. The adsorption ability of the eggshell was two- to six-times in the calcination temperature more than in the grain size. Therefore, the eggshell was thought to be usable as the desulfurization sorbent.

Lee, Bong-seon. 1998. A Semantic Analyisis of the Korean Discourse Marker `Keosigi. Studies in Modern Grammar 13, 197-212. The purpose of this paper is to give a pragmatic description of the Korean discourse marker `keosigi`, that is, how a speaker uses it for his purpose and how a hearer interprets it in discourse. The conclusion of this study is summarized as follows; First, the charateristics and the definition of the Korean discourse marker are given. Second, the relevance theory is suggested in which all the pragmatic uses of the discourse marker are inferred. Third, some discourse properties of `keosigi` are examined in accordance with relevance in the context where it is used.

추출조건에 따른 지골피의 몇가지 물리적 성질 및 화학성분조성을 조사하였다. 1. 고형분과 총당함량은 물추출이 에탄올 추출물보다 높았으나 반면에 탄닌산함량은 에탄올 추출물에서 높았다. 2. 지골피 물추출물이 탁도와 갈색도가 에탄올추출물보다 높았으며 색도 중 적도와 황색도는 유사하였다. 3. 용매별 분획추출결과 수율은 물 > n-부탄올 > 에틸에텔 > 초산에 틸 분획순으로 증가하였다.

Nanofiltration[NF45] and reverse osmosis membrane[HR98PP] separation treatment of dyestuff wastewater was carried out in order to seperate relatively pure water from synthetic dyestuff wastewater, which consists of reactive dye, acid dye, basic dye, direct dye, and disperse dye. The experiments were performed by using the plate and frame membrane module. In the nanoflltration and reverse osmosis membrane separation, When the NaCl concentration was 0.1, 5.0, and 20.0%, retention was 63.0, 46.0, 0.9%, respectively. When permeate flux was 125.0, 67.5, and 45.0 L/㎡·h, the osmotic pressure increased with increasing the NaCl concentration. Permeate flux of two membranes increased as temperature increased due to segmental movement of polymer of the membrane and the rejection rate of dyestuff was decreased gradually. It was found that the rejection rate was about 95% in the nanofiltration, while the reverse osmosis membrane showed a high rejection rate of 99% under all temperature and pressures conditions.

The purpose of this study was to investigate the pollutions of water qualities in 30 water samples from Nakdong River, Western Nakdong River, and Suyoung Stream. COD, BOD, T-N and negative ions(F-, Cl- NO3-, SO42-) of water samples were analyzed and the correlationships between water qualities were examined. The mean concentrations of COD(20.26ppm), BOD(25.36ppm), and T-N(18.05ppm) were the highest in the water sample of Suyoung Stream among the three streams and those of F-(0.25ppm), Cl-(27.70ppm), and SO2-(37.66ppm) in Western Nakdong River, that of NO_3,(10.81ppm) in Nakdong River. The water quality of Suyoung Stream was the worst among the three streams in Pusan area. The correlationships between water qualities were as follows ; BOD and COD showed very high correlationship(correlation coefficient, r=0.97), SO42- and NO3- did high one(0.75), and NO3- and COD, BOD did relatively high ones(0.56 and 0.48, respectively).

Toxic Mastoparan B(MP-B) which is purified from the venom of the hornet Vespa basalis is a cationic amphiphilic tetradecapeptide. MP-B and its Ala-substituted analogues were synthesized by solid phase method and the toxic peptide-membrane interactions were examined by circular dichroism(CD) spectra, fluorescence spectra, and leakage abilities in phospholipid membranes. In the presence of phospholipid vesicles, synthetic MP-B and its analogues formed amphiphilic α-helical structures, but in the buffer solution, those exhibited random coil conformation as measured by CD. Fluorescence spectra of MP-13 and its analogues which indicated the binding affinity of peptide on phospholipid vesicles showed that the replacement of Lys at position 2 and 11 with Ala caused a remarkable effect in the blue shift and that at position 2, in the leakage ability of the peptide.