인삼엽(人蔘葉)을 이용한 다류제조(茶類製造)에 관한 연구

양희천,이석영 한국농화학회 1979 Applied Biological Chemistry (Appl Biol Chem) Vol.22 No.1

The possibility of utilizing greet amount. of by-product of ginseng (Panax ginseng C.A. meyer) plant-that is, production of ter from ginseng leaf, was studied and the results are summarized as follows: 1. Ginseng leaf contains more soluble matter than tea leaf (Then sinensis) and the soluble matter is easily extracted by hot water. 2. Ginseng leaf has less tannin (2.2%) than yea leaf (7.89%). Therefore, it has less astringency that, tea. 3. Vitamin C content of ginseng leaf is not compared with that of tea leaf. In fact, ginseng leaf contains Vitamin C 50∼110 times of tea leaf. 4. Ginseng leaf contains 5.7∼8.5% glycoside (dammaranes) and the ratio of penaxadiol to panaxatriol is 0.54∼0.75 that is, panaxatriol contents is high. 5. For tire acceptability of the product related with the soluble matter contents and color t1e method of extracting 2g of ginseng leaf product in 200㎖ of water for 3 minutes is recommended. 6. As a result of evaluating the flavor characteristics and effective components of the products, product D which is produced by the process of steaming, drying and roasting is considered to have the best quality.

RNG $k-\varepsilon$ 모델의 적용성에 대한 연구

양희천,유홍선 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.9

In this study, the applicability of the RNG k-.epsilon. model to the analysis of the complex flows is studied. The governing equations based on a non-orthogonal coordinate formulation with Cartesian velocity components are used and discretized by the finite volume method with non-staggered variable arrangements. The predicted results using the RNG k-.epsilon. model of three complex flows, i.e., the flow over a backward-facing step and a blunt flat plate, the flow around a 2D model car are compared to these from the standard k-.epsilon. model and experimental data. That of the unsteady axisymmetric turbulent flow within a cylinder of reciprocating model engine including port/valve assembly and the spray characteristics within a chamber of direct injection model engine are compared to these from the standard k-.epsilon. model and experimental data. The results of reattachment length, separated eddy size, average surface pressure distribution using the RNG k-.epsilon. model show more reasonable trends comparing with the experimental data than those using the modified k-.epsilon. model. Although the predicted rms velocity using the modified k-.epsilon. model is lower considerably than the experimental data in incylinder flow with poppet valve, predicted axial and radial velocity distributions at the valve exit and in-cylinder region show good agreements with the experimental data. The spray tip penetration predicted using the RNG k-.epsilon. model is more close to the experimental data than that using the modified k-.epsilon. model. The application of the RNG k-.epsilon. model seems to have some potential for the simulations of the unsteady turbulent flow within a port/valve-cylinder assembly and the spray characteristics over the modified k-.epsilon. model.

현장 적용에 최적화된 침지형 미생물연료전지 개발 및 성능 평가

양희천,박영현,VanKhanh Nguyen,Hien T Nguyen,이태호 대한환경공학회 2015 대한환경공학회 학술발표논문집 Vol.2015 No.10

재배 오미자의 Anthocyanin 과 그의 안정성에 관하여

양희천,이종문,송기방 한국농화학회 1982 Applied Biological Chemistry (Appl Biol Chem) Vol.25 No.1

The composition and total content of anthocyanin in Omi ja (Schizandrae chinensis Baillon) and the factors affecting the stability of anthocyanin were investigated in model system. The total anthocyanin content was 84.74㎎% and major anthocyanin was poenidin-3-glucoside. At initial stare, hyperchromic effect was observed when sugary and organic acids were added to anthocyanin solution. Anthocyanin was gradually destroyed with storage, and its degradation was increased with pH, addition of sugars and ascorbic acid. But organic acids prevent the degradation of anthocyanin, During the storage, the hue of anthocyanin solution by added sugars and organic acids was changed from red to yellow, and the chroma decreased, butt the value was constant.

분류층 연소기내의 유동해석

양희천,박상규,정동화 한국마린엔지니어링학회 2001 한국마린엔지니어링학회지 Vol.25 No.6

This paper described a numerical investigation performed to understand better the effects of flow parameters in an entrained flow combustor on the flow characteristics. The computational model was based on the gas phase Eulerian equations of mass, momentum and energy. The code was formulated with RNG $k-\varepsilon$ model for turbulent flow. The calculation parameters were the ratio of primary and secondary jet velocity and the height difference between primary and secondary jet As the secondary jet velocity increased, the upper recirculation 3one of the primary jet was strengthened. It was found that as the primary jet velocity increased, there was a critical jet Velocity at which the size of upper and lower recirculation zone was reversed.

各種 김치 材料와 김치 熟成中의 窒酸鹽 및 亞窒酸鹽에 관한 硏究

梁熙天,權湧周 전북대학교 농업과학기술연구소 1982 農大論文集 Vol.13 No.-

According to the changes of nitrate reductase activity and pH, the changes of nitrate, nitrite and secondary amine were studied during tile various Kimchi fermentation, and the results obtained were as fellows: 1 . The average contents of NO3-N in the chinese cabbage and radish were 171.7 and 210.3 PPm. respectively. NO3-N in the side materials was below 50 ppm. NO2-N contents in the chinese cabbag and radish leave traces and the others was not detected. Secondary amino contents in the salted yellow corvina and shrimp were 40.89 and 22.53 ppm, respectivly. 2. Nitrates's early contents in the cucumher Kimchi and Dongchimi were 27.3 and 170.1 ppm, respectiIvely and was gradually decreased as time goes by. 3. NO2-N in the Kimchi was not detected early, hut detected after 2 days. NO2-N was suddenly increased between 4 days and 8 days, and as pH increased, it was decreased. 4. Secondary amine in the early period was increased and in the latter period was gradually decreased. 5. Nitrate reductase activity at 4℃ was similar to the changes of NO2-N, but at 20℃ keep it up in the latter period when NO2-N was not detected except cucumber Kimchi.

全北産 白米의 Alkali檢定과 食味와의 關係

梁熙天 全北大學校 1966 論文集 Vol.8 No.-

여러가지 品種의 白米를 Alkali 溶液에 浸漬해서 白米의 溶解狀態를 調査했다. 白米의 溶解狀態는 擴散性과 透明性으로 나누었다. 溶解하기 쉬운 白米는 低抗性이 작고 溶解하기 어려운 白米는 低抗性이 큰 것이다. ① 長粒種은 圓粒種보다 低抗性이 크다. ② 圓粒種中에서도 低抗性이 큰 것과 低抗性이 작은 白米가 있다. 진기 있는 밥이 되는 쌀은 擴散性의 若干 큰 것과 中間程度의 것이고, 진기 없는 밥이 되는 것은 低抗性이 작았다. ③ 同一種 일지라도 完全米는 靑米, 成熟不良米에 比해서 低抗性이 크다. ④ 新舊米의 低抗性을 調査했는데, 長粒種은 新米가 舊米보다 低抗性이 큰데, 圓粒種은 그 反對로 低抗性이 작았다. The dispersal of material from white rice kernels upon treatment for 24 hours with 1.2 percent potassium hydroxide was evaluated for its spreading and clearing on 5-point numerical scales. 25 varieties of rice were used in the study. Variety of more pronounced spreading and clearing was the less-resistant one and that of slight spreading and clearing was the most resistant variety. 1. Indica type rice was more resistant than Japonica type rice. 2. Among the Japonica type rices there are rice of resistant variety and rice of less-resistant variety. 3. Unripend rice was less-resistant than ripend rice. 4. The rice characterized by stickiness had a slight-to-moderate resistant for A lkali solution. The rice of less-sticky nature had a more pronounced reaction.

RH-531을 施用한 大豆의 Globulin 및 Glutelin의 加水分解에 의하여 生成되는 아미노酸의 組成

梁熙天,金中晩 全北大學校 1975 論文集 Vol.17 No.-

The crude globulin and glutelin were fractionated from the RH-531 treated soybeans and after the hydrolysis of these proteins by 6N-HCl solution their amino acids were separated and identified by the thin layer chromatography. The results are summarized as follow. 1. The hydrolysis of globulin and glutelin prepared from six kinds of RH-531 treated soybeans offerded the mixtures of 15 kinds of amino acids, which were identified by the thin layer chromatography, respectively, as aspartic acid, lysine, glutamic acid, serine, glycine, arginine, threonine, alanine, histidine, tyrosine, valine, methionine, leucine, proline and phenyl alanine. 2. The yield of crude globulin was highest in sample 3 and except the control the yield of crude glutelin was also highest in sample 3. And the total yield of NaCl-soluble fraction and NaOH-soluble fraction was also highest in sample 3. 3. In the one-dimensional chromatogram, depending on the increase of RH-531 amount, the contents of the globulin-composing amino acids increased, while the contents of glutelin-composing amino acids decreased. 4. In the two dimensional chromatogram the change of the composition of amino acids of globulin and glutelin was hardly observed but, sometimes, methionine and histidine were not detected. On the other hand, the change in the contents of amino acids of these two proteins was observable and was similar to the results reported by another authors.

人蔘葉의 利用에 관한 硏究 : I.Dammarane glycoside 의 含量 I.Contents of dammarane glycoside

梁熙天 전북대학교 농업과학기술연구소 1977 農大論文集 Vol.8 No.-

In order to establish the utilization method for the upperground part of Korean ginseng, the contents of dammarane aglycones as function of glycosides in 80% ethanol extracts were analyzed from main roots, leaves and petioles of Korean ginseng grown for 3~4 years. An approach for the assay of sapogenin contents in the part of main roots, leaves and petiles was performed by combination of preparative thin layer chromatographic procedure and vanillin-H2S04 colour reaction. The results obtained were as follows : 1. The differences by their grown ages in the contents of dammarane glycosides, in the ratio of panaxadiol to panaxatriol contents, and in the amounts of 80% ethanol extract of the parts of main roots, leaves and petioles were not sinificant. 2. Differences due to the parts were highly significant in all parameters mentioned, shown following results: main roots: 80% ethanol extract, 21.8-22. 9%. the ratio of aglycone composition, 0.949~1.041, dammarane glycoside(as diglucoside bases) 1.623~l.785, leaves: 80% ethanol extract, 34.87.~36.99%, dammarane glycoside, 12.123~13.009, the ratio of aglycone composition. 0.347~0.360, petioles; 80% ethanol extract, 23.23~23.85%, dammarane glycoside, 1.632~l.670. the ratio of aglycone composition, 0.388~o.446.

全州 地方産 사과의 化學成分에 관한 硏究 : I.不揮發性 有機酸과 Pectin 含量의 變化에 관하여 I.Seasonal variation of non-volatile organic acid and pectin contents

梁熙天,權湧周,金中晩 전북대학교 농업과학기술연구소 1976 農大論文集 Vol.7 No.-

Eight varieties of apples were sampled periodically from Jeonju area during their growth and ripening and the change of the contents of non·volatile organic acids in the edible part and the change of contents of pectin in the peel were surrveyed. The results were summarized as follows: 1. Titlable acidity was high at the early stage of growing of fruit body leveling over one percent in Jonathan, Ralls and Bendavis. The acidity decreased gradually and at the matured stage it marked 0.40∼0.60 % in all the sample varieties except Indo. The titrable acidity of Indo was very low at about 0.2 % showing little change in its acidity. 2. Malic acid was the main non-volatile organic acid and was detected in all the sample varieties at every growing stage. Tartaric acid was detected in all the sample varieties at the middle growing stage. Oxalic acid was found in fully matured apples of Ralls, Golden and Fuji, and succinic acid was detected in Mclntosh red at its middle stage of growing but the contents of these organic acids were very low. 3. The content of pectin in the peel was high at the middle growing stage and was slightly low when fully ripened.