BOX-Wilson 실험계획법에 의한 인산알루미늄의 최적합성조건에 관한 연구

신화우,강태욱,안세민 원광대학교 식품약품안전성연구소 1992 食品藥品安全性硏究 Vol.5 No.-

Aluminum phosphate is used as an antacid in pharmacy as the gel or dried gel, must meet specified neutralization rate and acid consuming capacity criteria. This nonadsorbable antacid has been used in place of aluminum hydroxide gel where loss of phosphate may be a problem to the patient. Since aluminum phosphate gel is regenerated in the intestine, endogenous phosphate is spared. The acid-consuming ability of aluminum phosphate is based on the release of phosphate anion : AlPO_4 ?? Al^3+ + PO^3-, PO^3-_4 + H_3O^+ ?? HPO^2-_4 + H_2O, HPO^2-_4 + H_3O^- ?? H_2PO_4 + H_2O. Aluminum phosphate gel was synthesized by reacting aluminum chloride as a soluble aluminum salt to sodium phosphate in this study ; AlCl_3 + NaPO_4 → AlPO_4↓ + 3NaCl. The optimum synthesis conditions based on the yield of product were investigated by applying Box-Wilson experimental design. It was found that optimal synthesis conditions were as follows ; Reaction temperature;90∼98℃, Concentration of two reactants;15.3∼15.5%, Concentration ratio of two reactants, [Na_3PO_4]/[AlCl_3];1.48∼1.49, reaction time;10minutes, drying temperature of product;60∼70℃.

과도 공진 기간을 최소화한 ZVT PWM 컨버터

김태우,안희욱,김학성 金烏工科大學校 2000 論文集 Vol.21 No.-

Boost converters using zero-voltage-transition (ZVT) pulse-width-modulation (PWM) is proposed for high efficiency and low noise application of power conversion systems. The auxiliary switch (S3) of the proposed converter has replaced the large Cc (>10Cr) that is using for soft switching of auxiliary switch (S2). Therefore, the additional switch (S3) of that is switched at the soft switching condition and the proposed converter reduced the resonant transition period and resonant transition energy. As mentioned above, the characteristics are verified through experimental results.

석이로부터 분리한 페놀성 화합물의 phospholipase A_2 저해활성

김진우,송경식,유익동,장현욱,유승현,배강규,민태진 충남대학교 생물공학연구소 1997 생물공학연구지 Vol.5 No.-

호알카리성 진균 Cephalosporium sp. RYM-202가 생산하는 alkaline xylanase (CX-III)의 작용에 의해 xylan 기질로부터 생성되는 주요 가수분해 산물은 xylobiose와 중합도가 4 이상인 xylooligosaccharides이었다. 이 효소는 xylobiose에 대한 분해능을 가지고 있지 않지만 xylotriose로부터는 xylobiose를, xylotetraose로부터는 xylobiose와 xylotriose를 주산물로 형성하였다. 이러한 결과들은 CX-III가 transglycosidase 활성을 소유하는 전형적인 endo-type xylanase임을 보여준다. N-bromosuccinimide에 의한 CX-III의 화학적 변화 실험 결과 효소 1분자 당 2개의 tryptophan 잔기가 활성에 관여하는 것으로 나타났다. 그러나 iodoacetamide 및 diethylpyrocarbonate에 의한 효소활성의 저해효과는 나타나지 않음으로써 이 효소의 활성부위에 cysteine과 histidine 잔기가 필수적이지 않음이 확인되었다. The hydrolysis products formed from birchwood xylan by the action of an alkaline xylanase (CX-III) from alkalophilic Cephalosporium sp. RYM-202 were xylobiose and xylooligosaccharides polymerized with more than 4 sugar molecules. This enzyme was not active on xylobiose but readily attacked xylotriose accumulating xylobiose as a major product. The predominant end-products from xylotetraose by CX-III were xylobiose and xylotriose. These results indicate that the enzyme is typically endo-type xylanase possessing transglycosidase activity. Chemaical modification of CX-III with N-bromosuccinimide revealed that two tryptophan residues per molecule of CX-III were essential for its catalytic activity on xylan. On the other hand, iodoacetamide and diethylpyrocarbonate did not influence the activity of the enzyme, suggesting that cysteine and histidine residues are not involved in the active site of this alkaline xylanase.

Diethy1 malonate 유도체들의 적외선 분광스펙트럼과 분자구조에 대한 고찰

권태우,이재욱 慶星大學校 1993 論文集 Vol.14 No.2

The FT-IR spectrctras of symmetric and asymmetric diethyl malonates were recorded on a BOMEM Michelson Series FT_IR spectrometer and stretching vibrations of C=O, C-O, C=C, CH₂, CH₃,out of plane C-H bending virbrations and overtone/combination bands for the compounds were compared respectively. In the C=O Stretching vibration asymmetrical diethyl malonate derivatives shows longer wave number than symmetrical derives and the energy minimized structures were used to explain the wave number shifts of the C=O stretching vibration peaks.

품종에 따른 수수 메탄올 추출물 및 용매분획물의 항산화활성

우관식, 김정인, 고지연, 이재생, 송석보, 정태욱, 김기영, 곽도연, 오인석, 정헌상 忠北大學校 農業科學硏究所 2013 農業科學硏究 Vol.29 No.1

The purpose of this study was to evaluate the antioxidant contents and activities of solvent fractions from methanolic extracts of sorghum according to varieties. The cultivated varieties were Hwanggeumchal-susu (HS), Milo-susu (MS) and Jungmo 4001 (JM4). The yield of methanolic extract of HS was 4.37%, whereas those of its solvent fractions (hexane, chloroform, ethyl acetate, butanol, and water) were 8.82, 2.46, 5.24, 24.49, and 47.23%, respectively. The highest total polyphenol, flavonoid, tannin, and proanthocyanidin contents of methanolic extracts (ME) were 30.33 mg GAE/g ME, 4.69 mg CE/g ME, 25.86 mg TAE/g ME, and 675.09 μg CE/g ME from HS, respectively. The highest total polyphenol and flavonoid contents of solvent fractions (SF) were 52.87 mg GAE/g SF and 18.86 mg CE/ g SF in ethyl acetate fraction of HS, respectively. The highest total tannin and proanthocyanidin contents of solvent fractions were 39.27 mg TAE/g SF and 1210.74 μg CE /g SF in the butanol fraction of HS, respectively. The highest DPPH and ABTS radical scavenging activities of the solvent fractions were 20.54 and 33.85 mg TE/g SF in ethyl acetate fraction of HS, respectively. The highest catalase activity of the solvent fractions was 67.92 nmol/min/mL in ethyl acetate fraction of HS. The superoxide dismutase- like activities of methanolic extracts from HS, MS and WS were 20.22, 20.00 and 3.14 unit/mL, respectively. The results of this study show that notable antioxidant activities in sorghum flowers have significant health benefits.

野生鳥獸의 分布와 捿息密度 및 食性에 關한 硏究 -第2報-

金甲德,禹漢貞,金泰旭 서울大學校 農科大學 1980 서울대농학연구지 Vol.5 No.1

1. Birds and Mammals census by line transect (Roadside census) and food plants for birds (plants birds like the most) was made at Mt. Baek Woon, No.4 No.5 No.6 and at Mt. Chi Ak, during 18 April 1978 to 11 February 1979. 2. The number per hour and percent dominance (for the total of all species) were calculated as indices for relative abundance of each species, (Table: 4,5,6,7). 3. Distance (per Km), width (per ha.), time (per hour) and relative abundance for each species in four census areas were observed. 4. 49 species of bird recorded, Great Tit, Parus major, Brandt's Jay, Garrulus glandarius, Crow Tit, Paradoxornis webbiana, Meadow Bunting, Emberiza cioides(resident) and Naumann's Thrush, Turdus naumanni, Brambling, Fringilla montifringilla, Rustic Bunting, Emberiza rustica(winter bird) were recorded as dominant species Mt.Baek Woon. Great Tit, Parus major, Blue Magpie, Cyanopica cyane, and Crow Tit, Paradoxornis webbiana were recorded as dominant species at Mt. ChiAK. 5. Blue Magpie, Cyanopica cyane is breeding at Mt. ChiAK but at Mt. Baek Woon it was not yet observed. 6. Korean Magpie, Pica pica is no distributed four census areas. 7. Mammalian fauna in four census area is relatively low and Korean Red Fox, Vulpes vulpes Chinese Wolf, Canis lupus and Siberian Leopard, Panthera pardus had exterminated since Korean War Table: 3) 8. A few number of Korean Flying Squirrel, Petaurista leucogenys hintoni is breeding at Mt. ChiAK.

산업기술발전에 부응하는 공업계 교원양성 교육과정 개발

김진순,김판욱,김태균,정우희 충남대학교 1992 論文集 Vol.15 No.1

The purpose of this study was to develop curriculum for the technical teacher education for newly planned College of Industrial Education of Chungnam National University to meet industrial technology progress in Korea. In order to achieve the purpose, the study investigated recent technological changes of industry and newly revised curriculum of technical high schools. The result of the study are summerized as follows: 1) For the general subjects the suggested curriculum consisted of 48 credits in 9 areas according to Chungnam National University regulation for general subjects. 2) For the professional subjects the suggested curriculum consisted of 20 credits in 10 subjects through slightly modification of governmental regulation for professional subjects. 3) For the technical subjects the suggested curriculum consisted of 80 credits, which ratio of required subjects to elective subjects is 50:50. And over 20 credits were alloted to practice, experiment and drafting are in order to strengthen practical competence. 4) The total credits of the curriculum consisted of 160 credits including 12 credits of general elective subjects. 5) The students taking minor course should complete over 21 credits (9 credits for required and 12 credits for elective) in minor course technical subjects within total 160 credits.

후방 비출혈 환자에서 비내시경하 전기소작술의 치료효과

김재영,이민우,김진국,한창준,남태욱,임채형 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Background and Objectives : Epistaxis is a common disease from which approximately 10% of the normal population have suffered in their life. Most bleeding sites of epistaxis are located anteriorly and easily controlled. However posterior epistaxis presents significantly great problems. A number of different treatment modalities are used to control the posterior epistaxis. Although not widely practiced, the nasal endoscopic electrocautery has also been effective. The purpose of this article is to report on the efficacy of nasal endoscopic electrocautery as an alternative and adjuvant to the standard approach for control of posterior epistaxis. Materials and Methods: We conducted retrospective chart review about 19 cases of posterior epistaxis treated from January 1998 to December 1999. Group I patients were managed by nasal packing only and group II patients were managed by nasal packing and endoscopic electrocautery. Results: Hospital days were 5.9 days in the group I and 3.6 days in the group II. The duration of nasal packing was 4.1 days in the group I and 1.8 days in the group II. The results were significant statistically Conclusion: Nasal endoscopic electrocautery was an effective treatment modality for control of posterior epistaxis.

응급실을 내원한 65세 이상 노인 환자의 분석

김진년,김태훈,강양욱,오명,김상철,김성훈,권계형,남홍우,이홍순,유형준 대한노인병학회 2001 대한노인병학회지 Vol.5 No.3

경구개법 또는 내시경하 비내 접근법으로 치료한 비인강 혈관 섬유종 3예

김진국,이민우,강성호,남태욱,김재영 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Nasopharyngeal angiofibroma is uncommon, histologically benign vascular tumor that occurs almost exclusively in adolescent males. It is clinically malignant because it has propensity for locally destructive growth and fatal hemorrhage. Treatment of angiofibroma is controversial. The two major treatment modality are surgery and radiation. Adjuvant treatment with chemotherapy or embolization can be used as well. We experienced three cases of nasopharyngeal angiofibroma that was resected by transpalatine and endoscopic endonasal approach with good result. So, we report these with review of literature.