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.

충돌분무의 특성에 대한 연구 ( Study for the Characteristics of Impinging Spray )

양희천,유홍선,박상규 대한기계학회 1997 대한기계학회 춘추학술대회 Vol.- No.-

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.

비구성 격자계를 이용한 실린더 주위의 유동특성에 대한 수치적연구

양희천 麗水水産大學校産業技術硏究所 1998 産業基術硏究所 論文集 Vol.7 No.-

With the unstructured grid, this paper performed the numerical calculation for the unsteady, incompressible fluid flow around the circular cylinder, and compared with the result of the other analysis code. Finite volume method was used for the discretisation of governing equation, and PISO algorithm was applied to the velocity-pressure coupling problem. Discretised algebra equation were solved by CG method. The calculated result for the flow around the cylinder expected the time at which asymmetry occurs behind the cylinder and calculated presssure coefficient and skin friction showed good agreeement with that of theoretical result.

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.

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

분류층 연소기내의 유동해석

양희천,김중현 한국마린엔지니어링학회 2000 한국마린엔지니어링학회 학술대회 논문집 Vol.2000 No.-

직접분사엔진의 분사압력 변화에 따른 유동장 및 분무특성에 대한 수치해석적 연구

양희천,정연태,유홍선 대한기계학회 1993 대한기계학회논문집 Vol.17 No.9

Since the rate and completeness of combustion in direct injection engines were controlled by the characteristics of gas flow fields and sprays, an understanding of those was essential to the design of the direct injection engines. In this study the numerical simulations of injection pressure effects on the characteristics of gas flow fields and sprays were preformed using the spray model that could predict the interactions between gas fields and spray droplets. The governing equations were discretized by the finite volume method and the modified k-.epsilon. model which included the compressibility effects due to the compression/expansion of piston was used. The results of the numerical calculation of the spray characteristics in the quiescent environment were compared with the experimental data. There were good agreements between the results of calculation and the experimental data, except in the early stages of the spray. In the motoring condition, the results showed that a substantial air entrainment into the spray volume was emerged and hence the squish motion was relatively unimportant during the fuel injection periods. It was found that as the injection pressure increased, the evaporation rate of droplets was decreased due to the narrow width of spray and the increased number of droplets impinged on the bottom of the piston bowl.

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.