• 대한용접접합학회:학술대회논문집
• /
• 대한용접접합학회 1994년도 특별강연 및 춘계학술발표 개요집
• /
• pp.62-64
• /
• 1994

• 대한용접접합학회:학술대회논문집
• /
• 대한용접접합학회 1994년도 특별강연 및 춘계학술발표 개요집
• /
• pp.65-68
• /
• 1994

• Journal of Periodontal and Implant Science
• /
• 제9권1호
• /
• pp.28.2-28.2
• /
• 1979

• 한국세라믹학회:학술대회논문집
• /
• 한국세라믹학회 2002년도 추계총회 및 연구발표회 초록집
• /
• pp.44.2-44
• /
• 2002

• 한국표면공학회지
• /
• 제24권4호
• /
• pp.179-186
• /
• 1991

The effects of silicone contents and flow rates(agitation rates) of electrolyte on the formation and mechanical properties of hard anodized film of Al-Si alloy have been studied in 12% H2SO4 + 1% Oxalic acid with varying the silicone contents in the rance of 0 to 11.6% and the flow rates of electrolyte in the range of 0 to 90cm/sec. The film forming voltage required to maintain an equivalent current density significantly increase with the silicone content of Al-Si alloys due to a low conductivity of silicone. Hardness and wear resistance of the anodized film of Al-Si alloys decreases wit increasing the silicone content. The increase in the flow rate of electrolyte has a similar influence on the formation and mechanical properties of anodized film as does the decrease in bath temperature. Hardness of anodized film is rapidly increased with the flow rate being increased from 10cm/sec. It is observed that the increase in the flow rate from 11cm/sec. It is observed that the increase in the flow from 11cm/sec to 48cm/sec is more effective in enhancing the hardness of film than is the decrease in bath temperature from 1$0^{\circ}C$ to $0^{\circ}C$.

• 대한한방부인과학회지
• /
• 제25권2호
• /
• pp.66-77
• /
• 2012

Objectives: This study was designed to investigate the effects of PR on ovarian tissue in PCOS rats through measurement of morphological and histo-pathological observations, ovarian size. In addition, effects on expression levels of Insulin like Growth Factor Receptor(IGFR) were also investigated to elucidate related mechanisms. Methods: PCOS was induced by single intermuscular injection with ${\beta}$-Estradiol 17-Valerate(EV) in female rats. Normal group(NOR, n=8) were injected with sesame oil and administrated hard food for five weeks. Control group(CTL, n=8) were injected with EV and administrated hard food for five weeks. CR group(n=8) were injected with EV and administrated hard food mixed CR for five weeks. Then, we measured weights of body and ovary, uptakes of food and water. And we observed morphological and histo-pathological changes of ovary, levels of IGFR. Results: In this experiments, single injection of Estradiol Valerate(EV) induced suppression of weight gain, formation of cysts, increase of IGFR expression. Oral administration of PR prevent decrease of ovarian size significantly. Further more, formation of cystic follicles induced by EV injection is suppressed by PR treatment. Conclusions: These results suggest PR can be used for patients with PCOS to prevent formation of cystic follicles and malfunction of ovary.

• 한국정밀공학회지
• /
• 제25권12호
• /
• pp.47-54
• /
• 2008

Hard turning process can be defined as a single-point machining process carried out on "hard" materials. The process is intended to replace or limit traditional grinding operations that are expensive, environmentally unfriendly, and inflexible. The purpose of this study is to achieve a systematic understanding of machining characteristics and the effects of machining parameters on cutting force, tool wear shape and chip formation by the outer cutting of a kind of wear resistant tungsten carbide V30. Hard turning experiments were carried out on this alloy using the PCD (Poly Crystalline Diamond), cBN (cubic Boron Nitride) and PcBN (Polycrystalline cubic Boron Nitride) cutting tools. The PcBN and the usual cBN tools were used to be compare with the PCD tool and the dry turning was carried out. The PcBN is attractive as the tool material which replaces the PCD. The tool wear width and cutting force were measured, and the worn tool and chip were observed. The difference of the tool wear mechanism among the three tool materials was investigated.

• 한국식품과학회지
• /
• 제29권4호
• /
• pp.700-704
• /
• 1997

Gluten 대체 재료로써 gum질과 지방질 및 활성 gluten을 첨가하여 쌀빵의 특성을 비교 검토 하였다. 실험에 사용한 모든 종류의 gum질 첨가에 의해서 쌀빵의 제조는 가능하였으며, 특히 3% hydroxypropyl-methyl-cellulose를 첨가하여 제조하는 경우 제빵의 성형성이 좋았다. 쌀빵 제조시 첨가하는 지방질로는 상온에서 액체상인 식용유를 사용하는 편이 고체상의 지방인 마아가린이나 라아드 보다 쌀빵의 비용적을 증가시키며, 부드러운 조직감을 부여하고 있었다. 쌀빵 제조시의 가열방법은 습식가열보다는 건식가열이 바람직한 결과를 얻었다. 3% hydroxypropyl-methyl-cellulose를 첨가하여 품종별 쌀로서 빵을 제조한 경우, 한강찰벼를 제외한 모든 품종에서 쌀빵 제조가 가능하였으며, 특히 수원조, AC 27, IR 44 등의 쌀로서 제조한 쌀빵의 성형성은 아주 좋았다. Gluten과 강력분을 첨가하여 제조하는 경우에도 한강찰벼를 제외한 모든 품종에서 쌀빵 제조가 가능하였으며, 수원 230이나 Pusa-33-30 등의 쌀로서 제조한 것이 다른 품종의 쌀보다 제빵성이 좋았다.

• 한국응용과학기술학회지
• /
• 제21권3호
• /
• pp.259-266
• /
• 2004

Film properties of monodispersed model composite latexes with particle size of 190 nm, which consist of n-butyl acrylate as a soft phase monomer and methyl methacrylate as a hard phase monomer with different morphology was examined. Five different types of model latexes were used in this study such as random copolymer particle, soft-core/hard-shell particle, hard-core/soft-shell particle, gradient type particle, and mixed type particle. Tensile strength and tensile elongation at break of final films were evaluated. Those properties can be interpreted in terms of PBA/PMMA phase ratio and their morphology. The interfacial adhesion strength was also evaluated using $180^{\circ}$ peel strength measurement and cross hatch cutting test.

• 대한치과보존학회:학술대회논문집
• /
• 대한치과보존학회 2001년도 추계학술대회(제116회) 및 13회 Workshop 제3회 한ㆍ일 치과보존학회 공동학술대회 초록집
• /
• pp.566.1-566
• /
• 2001

The most desirable healing process for endodontic therapy is apical closure by hard tissue such as dentine or cementum. Then, we estimated hard tissue conductivity of tetracalcium phosphate (4CP)/dicalcium phosphate (2CP) compound using mandibular first molars of SD rats. Residual pulp responses to the calcium phosphate compound were examined at several amputation levels of pulp. 2CP was purchased and passed through a $32-\mu\textrm{m}$ sieve. 4CP was obtained from a stoichiometric mixture of 2CP and calcium carbonate (Mol ratio: Ca/P=2.0) by the dry synthetic method at 1, 400(C for 8 hours.(omitted)