• 반도체디스플레이기술학회지
• /
• 제19권3호
• /
• pp.36-42
• /
• 2020

Silver nanowire (AgNW) random-meshes with high transmittance, low sheet resistance, and high oxidation stability and flexibility were fabricated using solution-based processes. The random-mesh structure was obtained by forming bubbles whose sizes and densities were controlled using a corona treatment of polyethylene terephthalate (PET) substrates. To reduce the sheet resistance of the fabricated AgNW electrode, a washing process using ethanol solution was performed. In addition, nickel (Ni) was coated on AgNW to improve resistance to oxidation. The effects of corona treatment and Ni-coating on the transmittance, sheet resistance, oxidation stability, and flexibility of the AgNW electrodes were investigated.

• 한국미생물·생명공학회지
• /
• 제34권3호
• /
• pp.244-249
• /
• 2006

누룩으로부터 분리한 야생효모 10균주의 청주제조 가능성을 위해 발효에 관여하는 몇 가지 특성을 조사한 후 신속간이 동정하였다. 전국에서 수집한 300여 점의 누룩으로부터 알코올 발효성이 뛰어난 야생효모 10균주를 선별하였으며 알코올 내성, 내당성 및 침강성을 조사한 후 발효물을 제조하여 알코올 함량, 당도, pH, 유기산 및 휘발성 향기성분을 조사하였고 선별된 10균주를 Biolog를 이용하여 신속간이 동정하였다. 알코올 내성은 ethanol 함량 18%까지는 모두 활성을 보였으나 20%이상에서는 효모 54-3, 90-2 그리고 91-5만이 활성을 나타냈으며 내당성은 모두 우수하였고 침강성은 효모 90-2가 83.03%로 매우 좋게 나타났다. 야생효모를 이용하여 발효물을 제조한 후의 알코올 함량은 대조군 7.42%보다 높게 나타난 것이 3 균주였으며 유기산은 효모 272-7이 대조군과 거의 같은 함량을 보였고 acetic acid 함량이 적은 균주는 total acid 함량 또한 적게 나타났다. 발효물에서의 휘발성 향기성분은 alcohol류가 4종, ester류가 11종 그리고 acid류가 1종 확인되었다. Higher alcohol과 휘발성분의 대부분을 차지한 ester류는 대조군이 월등히 높았고 효모 54-3과 91-2에서 대조군 면적비율의 중간 이상으로 나타났다. BIOLOG로 신속 간이 동정한 결과 효모 54-3 외 6 균주가 S. cerevisiae, 효모 192-2와 271-4는 Z. cidri 그리고 효모 91-5는 P. sydowiorum으로 동정되었다.

• 한국식품영양과학회지
• /
• 제44권10호
• /
• pp.1583-1587
• /
• 2015

본 연구에서는 어린감과 성숙감의 탄닌 함량 및 담즙산과의 결합능력을 비교 조사하였다. 또한 사람의 장내 세포인 Caco-2 cell에 어린감과 성숙감 추출물을 처리한 후 고농도의 DCA로 자극시켜 생성되는 NO의 수준과 TEER의 차이를 확인하였다. 탄닌 함량과 담즙산의 결합능력은 성숙감에 비해 어린감에서 유의적으로 높은 것으로 나타났으며 어린감 산성 에탄올 추출물에서 유의적으로 가장 높은 탄닌 함량 및 담즙산 결합능력을 보였다. NO 생성 억제능으로 확인한 염증반응에서도 어린감 산성 에탄올 추출물이 유의적으로 가장 높은 효과를 보였으며 DCA에 의해 유도된 장세포 간극의 느슨함을 유의하게 막아줄 수 있음이 확인되었다. 본 연구 결과를 토대로 어린감의 산성 에탄올 추출물은 고지방 식사를 통해 고농도로 축적되는 담즙산에 의해 형성된 유해한 장내 환경을 건강하게 유지시켜줄 수 있는 기능성 소재로 개발할 가능성이 있음이 확인되었다.

• 센서학회지
• /
• 제26권3호
• /
• pp.204-208
• /
• 2017

Highly uniform and well-dispersed Zeolitic Imidazolate Framework-7 (ZIF-7) particles were prepared by the precipitation of $Zn^{2+}$ using benzimidazole, which were converted into ZnO nanoparticles by heat treatment at $500^{\circ}C$ for 24 h. The ZIF-7 derived ZnO nanoparticles showed abundant mesopores, high surface area, and good dispersion. The gas sensing characteristics toward 5 ppm acetone, ethanol, trimethylamine, ammonia, p-xylene, toluene, benzene, and carbon monoxide and carbon dioxide were investigated at $350-450^{\circ}C$. ZIF-7 derived ZnO nanoparticles exhibited high response to 5 ppm acetone ($R_a/R_g=57.6$; $R_a$: resistance under exposure to the air, Rg: resistance under exposure to the gas) at $450^{\circ}C$ and negligible cross-responses to other interference gases (trimethylamine, ammonia, p-xylene, toluene, benzene, carbon monoxide, carbon dioxide) and relatively low responses to ethanol. ZIF derived synthesis of metal oxide nanoparticles can be used to design high performance acetone sensors.

• 대한기계학회논문집B
• /
• 제26권11호
• /
• pp.1630-1637
• /
• 2002

A slab-wick heat pipe was fabricated and tested for applications where the condenser temperature is in a range of 80 to 12$0^{\circ}C$. The pipe material was 9.53 mm O.D. copper tube and the working fluids were ethanol and water. The total length of the heat pipe was 1.6 m, in which evaporator section was 1.4 m and the condenser was 0.10 m. The slab was a composite wick structure fabricated with STS316 wire screens. Thermal load was varied for a specified fill charge ratio and inclined angle. The optimum fill charge ratio was identified to be 110% based on a theoretical calculation of the pore space in the slab wick of the heat pipe. The maximum thermal load was 120W for ethanol and the same was 200W for water with the condenser temperature of 8$0^{\circ}C$. The thermal performance of the slab wick heat pipe is analysed in terms of temperature characteristics and thermal resistance against thermal load, tilt angle and fill charge ratio.

• Archives of Pharmacal Research
• /
• 제27권7호
• /
• pp.790-796
• /
• 2004

Ginseng is a shade-loving perennial herb that is cultivated mainly in Korea, Japan, and China. The ginseng root has been used as a tonic remedy, and its antidiabetic activity has been demonstrated as early as 1920s. Although wild ginseng was anecdotally thought to be superior to cultivated ginseng as far as pharmacological properties were concerned, there have been no prior reports on the antidiabetic effect of wild ginseng. In this study, we investigated the preventative anti-diabetic and anti-obese effects of wild ginseng ethanol extract (WGEE). In the preventive experiment, WGEE co-administered with a high fat diet significantly inhibited body weight gain, fasting blood glucose, triglyceride, and free fatty acid levels in a dose dependent manner. WGEE-treated mice at doses of 250 and 500 mg/kg improved the insulin resistance index by 55％ and 61％ compared to the high fat diet (HFD) control, respectively. Diameters of white and brown adipocytes were also decreased by 62％ and 46％ in the WG500-treated group compared to those in HFD fed control mice. Taken together, WGEE has potential as a preventive agent for type 2 diabetes mellitus (and possibly obesity) and deserves clinical trial in the near future.

• Applied Biological Chemistry
• /
• 제27권4호
• /
• pp.217-224
• /
• 1984

생전분질원료(生澱粉質原料)를 사용(使用)하는 ethanol발효(醱酵)에 있어서 고온성효모(高溫性酵母)의 사용효과(使用效果)를 시험(試驗)하기 위하여 분리(分離), 보존중(保存中)인 고온성효모(高溫性酵母)(T-71균주(菌株))의 생육온도(生育溫度), ethanol 내성(耐性)등의 특성(特性)을 조사(調査)하고, 몇가지 생전분질원료(生澱粉質原料)를 사용(使用)한 발효시험(醱酵試驗)을 실시(實施)하였다. 고온성효모(高溫性酵母) T-71의 생육(生育) 및 발효최고온도(醱酵最高溫度)는 $42^{\circ}C$이며, 대조균주(對照菌株)보다 $2^{\circ}C$ 이상 높았으며 ethanol함유배지(含有培地)에 효모균체(酵母菌體)를 접종(接種)하여 발효능(醱酵能)을 검토(檢討)한 바 T-71균주(菌株)는 대조균주(對照菌株)보다 ethanol 내성(耐性)이 컸다. T-71균주(菌株)의 발효최적온도(醱酵最適溫度)는 술덧의 종류(種類)와 담금 농도(濃度)에 따라 달라지나 어느 경우나 대조균주(對照菌株)에 비(比)하여 최적발효온도(最適醱酵溫度)가 높았다. 시험균주(試驗菌株)를 각각(各各)의 최적온도(最適溫度)에서 발효(醱酵)시킬 때 고온성효모(高溫性酵母) T-17을 사용(使用)한 경우는 대조균주(對照菌株)의 경우에 비하여 발효기간(醱酵期間)을 $1{\sim}2$일간(日間) 단축(短縮)시킬 수 있었다. 절간생(切干生)고구마술덧에서 T-71균주(菌株)의 최적발효온도(最適醱酵溫度)는 $35{\sim}37^{\circ}C$(생성(生成) ethanol농도(濃度) 9.6% 조건(條件))이며 $40^{\circ}C$에서도 별차이가 없었으나, 보리가루술덧과 절간고구마가루술덧에서 T-71균주(菌株)의 최적발효온도(最適醱酵溫度)는 각각(各各) $35^{\circ}C$(각(各) 생성(生成) ethanol 농도(濃度) 14.0% 및 12.8%조건(條件))이었다.

• 한국막학회:학술대회논문집
• /
• 한국막학회 1996년도 추계 총회 및 학술발표회
• /
• pp.86-87
• /
• 1996

IPN (Interpenetrating Polymer Network) is a mixture of two or more crosslinked polymers with physically interlocked network structures between the component polymers. IPN can be classified as an alloy of thermosets and has the characteristics of thermosets such as the thermal resistance and chemical resistance and also has the characteristics of polymer alloys with enhanced impact resistance and amphoteric properties. The physical interlocking during the synthesis restricts the phase separation of the component polymer with chemical pinning process, thus the control of morphology is possible through variations of the reaction temperature and pressure, catalyst concentration and crosslinking agent concentration. Finely dispersed domain structure can be obtained through IPN synthesis of polymer components with gross immiscibility. In membrane applications, particularly for the separation of liquid mixtures, crosslinked polymer component with specific affinity to the permeate is needed. With the presence of the permeant-inert polymer component, the mechanical strength and the selectivity of the membranes are enhanced by restricting the swelling of the transporting polymer component networks.

• 한국세라믹학회지
• /
• 제31권11호
• /
• pp.1378-1386
• /
• 1994

The characteristic of calcined BaTiO3 powder and sintered PTC ceramics was investigated varing with calcination temperature and time of BaTiO(C2O4)2.4H2O synthesized from BaCl2.2H2O, TiCl4, oxalic acid and ethanol by oxalic acid method. When the particle size was less than 0.1 ${\mu}{\textrm}{m}$ by controlling calcination temperature and time, the resistance at room temperature was measured very high (above M{{{{ OMEGA }}). However, when the calcined particle sizes ranged from 0.2 to 0.3 ${\mu}{\textrm}{m}$, the resistance was 100 {{{{ OMEGA }} (After sintering, the grain size was 10~30 ${\mu}{\textrm}{m}$ homogeneously with the addition of dopant in sintering, the resistivity, resistance, $\alpha$ value and jumped to were 110{{{{ OMEGA }}.cm, 24$^{\circ}C$/% and 106{{{{ OMEGA }}, respectively.

• 한국세라믹학회지
• /
• 제54권6호
• /
• pp.525-529
• /
• 2017

To improve the thermal resistance of a porous borosilicate lining block, we prepared and applied polysiloxane-fumed silica-ethanol slurry on top of the block and fired the coating layer using a torch for 5 minutes at $800^{\circ}C$. We conducted magnified characterizations using a microscope and XRD analysis to observe phase transformations, and TGA-DTA analysis to determine the thermal resistance. Thermal characterizations showed improved heat resistance with relatively high polysiloxane content slurry. Cross-sectional optical microscope observation showed less melting near the surface and decreased pore formation area with higher polysiloxane content slurry. XRD analysis revealed that the block and coating layer were amorphous phases. TGA-DTA analysis showed an endothermic reaction at around $550^{\circ}C$ as the polysiloxane in the coating layer reacted to form SiOC. Therefore, coating polysiloxane on a borosilicate block contributes to preventing the melting of the block at temperatures above $800^{\circ}C$.