전해질 용액에서 용매 및 이온의 활동도 계수

심민영,김기창 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A

In this work we measured the total pressure of the aqueous solutions and the methanol-water solutions dissolved with inorganic salts, at 25℃. In organic electrolytes used in this work were K₂SO₄and (NH₄)₂SO₄. Using the measured vapour pressures the activity coefficient of solvents and the mean ionic activity coefficient were obtained through thermodynamic relations. The activity coefficients of solvent and the mean ionic activity coefficirnt obtained in this work were fitted with Macedo's model and Acard's model. Both two models were good agreeable to the vapor pressure and the mean ionic activity coefficient for the electroyte aqueous solutions. For electrolyte /methanol/water solutions, Macedo's model had much deviation from experimental data, while Acard's model showed a good agreement with experimental data.

청정 지역 강우의 분석 : 1997-1998년 한라산 1100 고지와 제주시 강우의 특성 Characteristics of Rainwater at 1100 Site of Mt. Halla and Cheju City in 1997-1998

강창희,김원형,홍상범,이기호,홍민선,심상규 濟州大學校 基礎科學硏究所 2000 基礎科學硏究 Vol.13 No.1

The rainwater samples were collected from the 1100 Site of hlt. Halla and Cheju city during the period of March in 1997 to August in 1998. and the major soluble ions were analyzed. The confidence of analytical data was confirmed by using the comparison methods such as ion-balance, electric conductivity and acid fraction. all of which correlation coefficients were above 0.94. The ionic strengths lower than 10^(-4)M, the basis for the pure rainwater, were found in 47% and 38% at 1100 Site and Cheju city, respectively. The precipitations in Cheju city were more influenced by the oceanic effect than those in 1100 Site. The acidity contribution was mainly by SO_(4)^(2-) and NO_(3)^(-) in both areas. and the organic acids have contributed to the acidity with only 5-7%. The neutralization factors by NH_(3) were about 46% at both 1100 site and Cheju city, whereas those by CaCO_(3) were 11% and 15% at 1100 site and Cheju city respectively, and the free acidity were both about 35% in average. From the MSA analysis. it was found that the air in Cheju island has been influenced by the pollution from the other areas. The sources of the rainwater components in 1100 Site and Cheju city were also studied with a factor analyzing way and the most probable factors were found to be anthropogenic, oceanic, and soil-sourced. The results of multiple regression analysis have shown that SO_(4)^(??) was dissolved mostly in the form of H_(2)SO_(4), CaSO_(4) and (NH_(4))_(2)SO_(4). and NO_(3)^(-) was in the form of HNO_(3), Ca(NO_(3))_(2) and NH_(4)NO_(3).

적색 및 녹색 풋고추의 화학성분

정창호,심기환 경상대학교 농업생명과학연구원 2001 농업생명과학연구 Vol.35 No.-

품종에 따른 전통 향신료로서 이용가치를 결정하고 한국인의 식습관에 맞는 고추의 품질을 개선하기 위하여 적색 및 녹색 풋고추의 화학성분을 비교, 분석한 결과 일반성분은 적색 풋고추와 녹색 풋고추에서 총당이 각각 6.87%와 4.63%로 나타났으며, 무기성분은 K 및 P이 적색 풋고추와 녹색 풋고추에서 370.12 ㎎%, 162.28 ㎎% 및 44.36 ㎎%, 38.80 ㎎%로 각각 높게 나타났고, 비타민 C는 적색 풋고추에서는 169.77 ㎎%, 녹색 풋고추에서는 72.45 ㎎%로 각각 나타났다. 유리당 함량은 적색 풋고추와 녹색 풋고추에서 fructose(1,852.0 ㎎%, 216.4 ㎎%)와 galactose(1,443.7 ㎎%, 292.2 ㎎%)가 높게 나타났으며, 유기산의 경우 적색 풋고추에서는 citric acid가 672.40 ㎎%, 녹색 풋고추에서는 succinic acid가 311.49 ㎎%로 높게 나타났다. 지방산 조성은 적색 풋고추와 녹색 풋고추에서 linoleic acid가 각각 32.89%와 36.20%로 높게 나타났으며, 아미노산 함량은 적색 풋고추에서는 aspartic acid가 237.4 ㎎%로 높게 나타났고, 녹색 풋고추에서는 glutamic acid가 237.2 ㎎%로 가장 높게 나타났다. 색도는 녹색 풋고추는 적색 풋고추에 비해 L값은 높았으나 a, b값은 낮게 나타났다. To study the availability of the Capsicum annuum. L as traditional herbs and in order to improve quality, the properties of chemical components were investigated. Among general components of unripe red and green pepper, total sugars portions from unripe red and green pepper took 6.87% and 4.63%, respectively. The mineral component contents of the unripe red and green pepper were K(370.12 ㎎%, 162.28 ㎎%) and P44.36 ㎎%, 38.80 ㎎%), respectively. The contents of vitamin C was 169.77 ㎎% for unripe red pepper and 72.45 ㎎% for unripe green pepper and that of free sugar was 1,852.0 ㎎% of fructose for unripe red pepper and 292.2 ㎎% of galactose for unripe green pepper and that of organic acid was 672.40 ㎎% of citric acid for unripe red pepper and 311.49 ㎎% of succinic acid for unripe green pepper. The highest fatty acids in unripe red and green pepper was linoleic acid and its composition was 32.89% and 36.20%, respectively. The highest component of total amino acids in unripe red and green pepper was aspartic acid(237.4 ㎎%) and glutamic acid(237.0 ㎎%), respectively. Unripe red pepper showed higher Hunter parameter a and b value and lower L value than unripe green pepper.

국내산 석회석을 이용한 배연탈황의 반응속도론적 연구

김기창,심민녕 강원대학교 석재복합신소재제품연구센터 1997 석재연 논문집 Vol.2 No.-

본 연구에서는 충북 단양지역에서 산출되는 천연산 석회석 광으로 부터 얻은 직경 0.71 -0.85 mm의 석회석 입자와 SO₂와의 황화 반응실험을 수행하였다. 반응실험은 내경 8 mm의 미분반응기에서 수행되었으며, 반응초기 상태에서의 SO₂ 및 O₂의 몰분율은 각각 0.0018, 0.1 로 유지하였고 반응온도 영역은 750-950 ℃ 범위로 하였다. 반응기 출구에서 SO₂의 농도를 반응시간에 떠라 측정하여 SO₂의 물질수지 관계에 의하여 CaO의 반응속도 및 반응전환률을 얻었다. 황화반응 완결시의 CaO의 0.35 - 0.51 범위였으며 온도에 따라 증가하는 경향을 보였다. 한편 CaO의 전환률이 반응시간에 따라 변화하는 경향을 grain모델로 해석하여 보았으며, 본 연구의 반응실험 데이타는 반응생성물인 CaSO₄층내의 확산이 율속단계인 경우의 관계식과 잘 일치하였다. The reaction between sulfur dioxide and domestic limestone particles with size ranges 0.71 - 0.85 mm was carried out in the differential reactor made of the qurtz tube( ID= 8mm), over the temperature range 750 - 950 ℃. The gas mixtures entering the reactor contained 0.185 vol.% SO₂ and 10 vol.% O₂, with the balances as N₂, and the concentrations of SO₂ in the off-gases were measured through G.C. analysis. The degree of sulphation of CaO as a function of time was calculated by integation of the difference between the SO₂ concentration of gases leaving the reactor and the SO₂ concentration of the initial gas mixtures, with respect to reaction time. The maximum conversion of CaO under the condition of this experiments was in the range from 0.35 to 0.51, and raised with temperature. The experimental conversions of CaO vs. time were correlated based on the grain model. This correlation provided that the experimental conversion data were in a good agreemnts with the relation of products-layer-diffusion step.

비장의 상피양 낭종 : 1예 보고 A Report of A Case

양기화,강창석,심상인,김선무,함흥정 최신의학사 1986 最新醫學 Vol.29 No.12

CPA 상태방정식에 의한 회합성 유체의 PVT 관계

김미경,심민영,김기창 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A

For modeling an equation of state suitable for describing associating fluids, we combined the cubic equation of state (Peng-Robinson)and an association term of SAFT. The resulting EoS(Cubic-Plus-Association)is not cubic with respect to volume and contains five pure compound parameters.Excellent correlations of both vapour pressures and saturated liquid volumes were obtained for n-alcohols and secondary alcohols, We considered a method for reducing the number of adjustable pure compound parameters from five to three, and the resulting 3-parameters EoS relation maintained the good correlation of vapour pressures and saturated liquid volumes.

N Use Efficiency and Nitrate Leaching by Fertilization Level and Film Mulching in Sesame Cultivated Upland

Dong-Wook Lee,Ki-Do Park,Chang-Young Park,Il-Soo Son,Ui-Gum Kang,Jee-Yeon Ko,Kang-Bo Shim,Young-Son Cho,Sung-Tae Park 韓國作物學會 2007 Korean journal of crop science Vol.52 No.3

This study was conducted to evaluate the effect of slow release fertilizers (SRF), crotonylidene diurea (CDU) and latex coated urea (LCU), on nitrogen (N) use efficiency (NUE) and nitrate-N leaching in a silty clay loam soil under polyethylene film mulching (PFM) for sesame cultivation. In PFM plot, concentrations of NO3-N and NH4-N in SRF applied soils were less than that in the urea plot during the whole growing period. However, NO3-N and NH4-N in all the non-mulched plots (NM) were not significantly different. Urea-N in soil treated with SRF was higher than urea plot until 50 days after application and was comparable in all the treatments after 50 days. NO3-N concentrations in leached solution in 21 days after urea fertilization in PFM and NM were 26 mg L-1 and 83 mg L-1 , respectively. However, NO3-N in leached solution at applied CDU and LCU was less than that of urea similar to nitrate concentration in soil. NO3-N in leached solution in applied CDU and LCU in 44 days after application was about 25% lower than that urea plot and PFM, while the NO3-N concentration of CDU and LCU treatment in NM did not changed. Application of SRF increased the yield of sesame and N recovery compared to urea and there was a little difference between SRF and N levels. In conclusion, application of 80% N level with SRF increased N recovery and reduced nitrate leaching without reduction of yields compared with urea application.

환삼덩굴 잎과 줄기의 화학성분

허재연,정창호,심기환 경상대학교 농업생명과학연구원 2003 농업생명과학연구 Vol.37 No.1

기능성 식품재료로서 환삼덩굴의 줄기와 잎의 이용성을 향상시킬 목적으로 암, 수로 구분하여 화학성분을 분석하였다. 일반성분 중 가용성 무질소물과 조단백질 함량은 잎에서 높게 나타났으며, 수분과 조섬유는 줄기에서 높게 나타났고, 줄기와 잎의 주요 무기성분은 K, Ca, P 및 Mg으로 나타났다. 유리당을 분석한 결과 숫잎과 암잎에서 fructose는 각각 0.16%와 0.10%로 나타났으며, 숫줄기와 암줄기에서 sucrose는 각각 0.37%와 0.24%로 나타났다. 비휘발성 유기산을 분석한 결과 acetic acid가 잎(4.99 mg%와 3.07 mg%)과 줄기 (3.18 mg%와 2.25 mg%)에서 가장 많이 함유되어 있었으며, lactic acid, succinic acid 및 formic acid 순으로 함유되어 있었다. 잎과 줄기의 아미노산 조성은 각각 다르게 나타났지만 잎과 줄기의 주된 아미노산은 aspartic acid, glutamic acid, isoleucine 및 lysine으로 나타났다. 잎과 줄기의 주요 지방산은 linoleic acid와 palmitic acid 였다. To study the potential of the Humulus japonicus leaves and stalks as materials for functional food, chemical components of the male and female plants were analyzed. Among general components of leaves and stalks, contents of nitrogen free extract and crude protein were higher in leaves than in stalks, whole contents of moisture and crude fiber were higher in stalks than in leaves. The major minerals contained were K, Ca, P and Mg. Among free sugars, frutose(0.16% and 0.10%) and sucrose(0.37% and 0.24%) were the highest in leaves and stalks of male and female plants, respectively. Of non-volatile organic acids assayed acetic acid was the most abundant in both leaves(4.99 mg% and 3.07 mg%) and stalks(3.18 mg% and 2.25 mg%), followed by lactic acid, succinic acid and formic acid. The amino acid compositions of leaves and stalks were different each other and aspartic acid, glutamic acid, isoleucine and lysine were the major amino acids in both leaves and stalks. Major fatty acid in leaves and stalk were linoleic acid and palmitic acid.

N Use Efficiency and Nitrate Leaching by Fertilization Level and Film Mulching in Sesame Cultivated Upland

Lee, Dong-Wook,Park, Ki-Do,Park, Chang-Young,Son, Il-Soo,Kang, Ui-Gum,Ko, Jee-Yeon,Shim, Kang-Bo,Cho, Young-Son,Park, Sung-Tae The Korean Society of Crop Science 2007 Korean journal of crop science Vol.52 No.3

This study was conducted to evaluate the effect of slow release fertilizers (SRF), crotonylidene diurea (CDU) and latex coated urea (LCU), on nitrogen (N) use efficiency (NUE) and nitrate-N leaching in a silty clay loam soil under polyethylene film mulching (PFM) for sesame cultivation. In PFM plot, concentrations of $NO_3-N$ and $NH_4-N$ in SRF applied soils were less than that in the urea plot during the whole growing period. However, $NO_3-N$ and $NH_4-N$ in all the non-mulched plots (NM) were not significantly different. Urea-N in soil treated with SRF was higher than urea plot until 50 days after application and was comparable in all the treatments after 50 days. $NO_3-N$ concentrations in leached solution in 21 days after urea fertilization in PFM and NM were 26 mg $L^{-1}$ and 83 mg $L^{-1}$, respectively. However, $NO_3-N$ in leached solution at applied CDU and LCU was less than that of urea similar to nitrate concentration in soil. $NO_3-N$ in leached solution in applied CDU and LCU in 44 days after application was about 25% lower than that urea plot and PFM, while the $NO_3-N$ concentration of CDU and LCU treatment in NM did not changed. Application of SRF increased the yield of sesame and N recovery compared to urea and there was a little difference between SRF and N levels. In conclusion, application of 80% N level with SRF increased N recovery and reduced nitrate leaching without reduction of yields compared with urea application.

폐렴연쇄구균에 의한 난관난소 농양 1예

김명신,이아원,류기성,강진한,강창석,심상인 대한감염학회 2003 감염과 화학요법 Vol.35 No.5

폐렴연쇄구균은 흔히는 폐렴, 수막염, 부비동염, 중이염 등을 일으키며, 폐렴연쇄구균에 의한 여성생식기의 감염의 보고는 매우 드물다. 저자들은 최근 기저질환이 없는 71세 여자 환자에서 특별한 선행요인 없이 폐경기에 발생한 폐렴연쇄구균에 의한 난관난소농양을 경험하였기에 문헌 고찰과 함께 보고하는 바이다. 환자는 6주간의 하복부 불쾌감을 주소로 내원하였다. 좌측부속기에 6㎝ 크기의 종괴가 발견되어 전자궁 적출술 및 양측 부속기 절제술을 시행하였다. 병리학적 소견은 세균성 난관난소농양에 합당하였고, 농양 배양 결과 혈청형 23A의 폐렴연쇄구균이 분리되었다. 환자는 수술과 항생제 사용 후 호전되었다. Streptococcus pneumoniae has been known to cause pneumonia, meningitis, sinusitus, and otits media. S. pneumoniae is infrequent cause of infection in the female genital tract. We report a case of pneumococcal tubo-ovarian abscess in postmenopausal woman. A 71-year old woman was admitted, because of abdominal discomfort for six weeks. About 6 ㎝-sized mass located in left adnexal area was found. She underwent gynecologic surgery-total hysterectomy and both adnexectomy. The pathologic findings were consistent with bacterial tubo-ovarian abscess. S. pneumoniae serotype 23A was isolated from pus specimen. She was cured by operation and antibiotic therapy.