Sodium A Zeolite의 흡착특성에 관한 연구

전윤,김숭평 조선대학교 생산기술연구소 1984 生産技術硏究 Vol.6 No.2

The adsorption isotherms of oxygen on the natural zeolite were obtained at the temperature of liquid oxygen and analysed by utilizing Langmuirs and Dubinin Astakhovs equation. The conclusion is that there are two types of adsorption site and effective micropore volume obtained from the intercepts taken at p/p_(o)=1 by extrapolation of the linear parts of isotherms of the zeolites have a maximum value at about 35 unit cell number, but real volumes of the solids increase linearly with decreasing unit cell number until the corruption of zeoite crystal structure is reached. The characteristic energies of adsorption on the zeolite increase linearly with increasing unit cell number.

PET와 열방성 액정 코폴리에스테르의 블렌드

전윤 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.1

Blends of a thermotropic liquid crystalline polyester, poly(PET/TR4) with poly (ethylene terephthalate)(PET) were prepared by precipitation from a mixed solvents. followed by drying and compression molding to produce a polymer sheet. Thermal, morphological and physical properties of the blends were examined by differential scanning calorimetry. optical microscopy and scanning electron microscopy. On the blend containing 1% of the TLCP, interfacial adhesion between the TLCP and the pure PET appeared excellent. The TLCP also acts as a good nucleating agent and improves crystal growth rate in the blends.

Disiloxane spacer를 갖는 액정 중합체의 합성 및 특성 연구

전윤,신성의,송연호,권규혁,김선,신대윤,최형일,최재곤 조선대학교 생산기술연구소 1983 生産技術硏究 Vol.1983 No.-

Two closely related copolymers that contain a di (oxyphenyl) terephthalate or a hydroquinone ring as a rnesogenic unit interconnected by a decamethylene and a disiloxane as flexible spacers in the main chain were synthesized and characterized for their mesogenic properties. These two polymers showed nematic mesogenic behavior and the phase transitions from solid to nematic phases and from nematic to isotropic were reversible, that is, antiotropic. The effect of spacers on the mesogenic unit on the stability of the mesophase or on the orientational order of polymer units in the mesophase could be rationalized on the bases of observed thermodynamic data.

氣一固系 充塡 流動層에 關한 分級硏究

田允 조선대학교 생산기술연구소 1981 生産技術硏究 Vol.1981 No.-

The segregation of a larger and smaller particles in a gas-solid fluidized bed packed with glass ball was studied with glass particle. The overall degree of segregation was difined as the difference in the weight percent of smaller particles between the samples of top and bottom of the bed, while the local degree of segregation was difined as the local weight percent of the smaller particles. The experiment was started afer putting larger particles on the top of the smaller one. The local and the overall degree of segregations as a function of bed height were obtained for the various gas flow rates and sizes. As a result, the glass ball packed fluidized bed could be effectively used for the particle segregation. Also, the higher bed height gave better segregation and the segregation was most effective at 2 times gas flow rate of the minimum fluidization.

키토산 미소구체가 약물방출에 미치는 영향

전윤,차월석,권규혁,이동병 조선대학교 생산기술연구소 2000 生産技術硏究 Vol.22 No.1

In this study, we examined about effectives of the drug release by used glutaraldehyde amount and molecular weight varieties of chitosan in DDS. The release experiments of chitosan microspheres containing norfloxacin were operated in the phosphate buffer solutions of pH 7.4 and 37℃, and its results were as follows. In the linearly release time of drug, chitosan microspheres (Mw 190,000) of used glutaraldehyde 1 mL and 2 mL were 45 and 64 days, and chitosan microspheres (Mw 350,000) of used glutaralhyde 1 mL and 2 mL were 60 and 80 days relatively. These results showed more effective drug releases in the increments of molecular weight and glutaraldehyde In short, the formulation allows chitosan microspheres to suppress the burst effect of the drug release mechanism, which led to the controlled release pattern and microspheres

액정폴리에스테르와 poly(ethylene 2,6-naphthalate)의 블렌드

전윤 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.2

A new thermotropic liquid crystalline polyester(TLCP) was synthesized and melt blended with PEN for the application of in situ composite. The TLCP showed nematic behavior in melt with an m.p. of 211℃. The glass transition temperature(Tg) of the PEN in the blends decreased as the content of TLCP increased. and the TLCP acted as a nucleating agent for the matrix polymers. The TLCP domains in the blend fibers were well dispersed with its size of 0.3㎛, and the skin-core effect was observed in the 20% TLCP/PEN blend fibers.

증류탑에 있어서의 미량성분의 단효율에 관한 연구

田允 조선대학교 생산기술연구소 1981 生産技術硏究 Vol.1981 No.-

The plate efficiency of a minor component is requisite to predict the behavior of that component in distillation. By uae of an older show-type column, continuous rectification of an azeotropic mixture of isopropanol and water containing a minute amount of furfural was carried out under various conditions. The concentrations of the minor component in distillate and bottoms were obtained. An equation describing the ratio of the concentration of a minor component in distillate to that in bottoms was derived. The Murphree vopor efficiencies were determined so as to fit the calculated ratios to the experiment ones. Plotting efficencies against vapor rate shows that efficiencies are within the limit of 0.7∼0.8 at vapor rate higher than about 35g/㎠hr. When the vopor rate becomes lower than that, however, the data are scattered. In the system described in this paper, the value of efficiency of the minor component at higher vapor rates is comparable to that obtained for a major component by the conventional method.

마늘 주아의 발아율을 높이기 위한 친환경 소독 방법과 발아온도 규명

전윤아(Yoon-A Jeon),차미경(Mi-Kyung Cha),조영열(Young-Yeol Cho) 한국원예학회 2018 원예과학기술지 Vol.36 No.5

본 연구는 새로운 잎채소로 잎마늘로 사용하기 위해 ‘남도’ 마늘의 소립 주아를 이용해 최적의 소독방법과 온도를 결정하고자 수행되었다. 주아의 소독방법으로는 NaOCl 처리와 UV 램프 처리를 이용한 두 가지 소독방법으로, 주아의 발아율과 오염률를 측정하여 조사하였다. NaOCl 농도 처리는 0에서 4.0% 처리와 UV 조사시간을 달리하여 15분에서 60분 처리하였다. 주아의 발아를 위해 생육상에서의 발아 온도는 2.0% NaOCl 용액에 온도 20, 25와 30°C로 처리하였다. 침지 시간은 발아율에 유의적인 차이는 없었지만, 오염률을 감소시켜서, 침지시간이 길어질수록 더 낮은 오염률을 나타냈다. 모든 다른 매개 변수 조합들을 비교 분석하면, 주아를 2.0% NaOCl에서 45분 동안 또는 3% NaOCl에서 30분 동안 항온 처리되었을 때 가장 높은 발아율을 보였다. 4시간 동안 UV를 조사하면 발아율이 NaOCl에 의한 소독 방법에 비해 감소되었지만, 가장 높은 발아율을 보였다. 온도는 발아율과 음의 상관 관계를 보였으나, 최적 온도는 20°C보다 높은 고온에서는 더 많은 오염률이 관찰되었다. ‘남도’ 마늘 주아를 2.0과 3.0 % NaOCl 용액에 30분간의 침지 시간 처리한 후 20°C에서 발아시키면 가장 높은 발아율과 낮은 오염률을 얻을 수 있다. This study aimed to determine the optimal disinfection method and temperature for germinating ‘Namdo’ garlic bulbils in order to use the garlic shoots as a new leafy vegetable. Two different disinfection methods utilizing either NaOCl or ultralviolet (UV) treatments were evaluated by measuring the germination rate of bulbils and the frequency of infection events. The NaOCl method involved treatments with NaOCl concentrations ranging from 0% to 4% for different periods from 15 up to 60 minutes, whereas under UV treatments only the irradiation time was varied. Germination rates of bulbils were assessed after soaking in 2.0% NaOCl and incubation at three different temperatures: 20, 25, or 30°C. Varying the bulbil soaking period did not result in different germination rates, however, it did reduce the infection frequency, with more extended soaking periods resulting in fewer infection events. Comparative analysis of all different parameter combinations revealed that the highest germination rate was observed when bulbils were incubated in 2.0% NaOCl for 45 min or in 3% of NaOCl for 30 min. Irradiation with UV light for 4 hours resulted in the highest germination rate among the irradiation durations, albeit the germination rate was reduced compared to the NaOCl-mediated disinfection method. Temperature was negatively correlated with germination rate, while more infection events observed at higher temperatures, with 20°C being the optimal temperature. We suggest incubation of ‘Namdo’ garlic bulbils in either 2.0 or 3.0% NaOCl solution with more than 30-min soaking time followed by incubation at 20°C to achieve the highest germination rate with low occurrence of infection events.

초등 과학 수업에서 스토리텔링 전략의 효과

전윤아, 강석진 全州敎育大學校 初等敎育硏究所 2016 初等敎育硏究 Vol.27 No.2

Si 單結晶 中의 轉立速度에 관한 理論의 考察

全潤漢 金烏工科大學校 1980 論文集 Vol.1 No.-

半導體 單結晶에 대한 V.Cell 등의 Dragging point model 과 T.Ninomiya등의 Abrupt kink model 이 考察되었다. 前者의 理論은 低溫에서 後者의 理論은 高溫에서 잘 一致함이 實驗結果들과의 비교로 알 수 있었다. 그러나 반도체의 전기적 특성이 전위속도에 막대한 영향을 준다는 실험적 결과에도 不拘하고 위 理論은 電氣的 特性과 크게 관련되어 있지 않다.