도재소부용 금합금의 열처리에 따른 기계적 성질 및 미세조직 변화에 관한 연구

남상용,곽동주,차성수,Nam, Sang-Yong,Kwak, Dong-Ju,Cha, Sung-Soo 대한치과기공학회 2009 대한치과기공학회지 Vol.31 No.4

The purpose of this study was to observe the change of mechanical property and microstructure in porcelain fused to gold alloy by heat treatment. PFG alloys are composed with Au-Pd-Ag alloy of the additional elements with indium, tin and copper. Specimens were tested in hardness using vicker,s micro-hardness tester and the surface micro structural changes were analysed by SEM and EDS. The results were as fellows: 1. The vickers hardness showed highest in Au-Pd-Ag alloy of the additional element with tin. 2. By hardening-oxiding result, the vicker,s hardness increased in additional element with tin but there was no significant difference in additional elements with indium and copper. 3. The surface oxide layer of Au-Pd-Ag alloy with added indium and tin increased but there was small change in additional element with copper. 4. The elements of indium and tin increased with increasing heat treatment in the surface alloy.

치과기공실(齒科技工室)의 작업공정별(作業工程別) 소음(騷音)에 관한 연구(硏究)

남상용,Nam, Sang-Yong 대한치과기공학회 1993 대한치과기공학회지 Vol.15 No.1

Degree of noise by personal dental laboratory working process and degree of noise by complex dental laboratory working process were measured separtely. The time of exposure to noise greater than 70dB was analyzed. Then, the whole degree of noise in dental laboratory was estimated on the basis of afore-mentioned information. Questionaire were employed to investigate the mental, emotional and physiological effects of noise in dental technicians, The purpose of this study was to provide basic information on keeping dental techneicans who are exposed to noise pollution in good working condition and good health. Results obtained are as follows ; 1. Polishing process in each working part showed high degree of noise greater than 70dB in terms of degree of noise by personal working. 2. Degree of noise by complex working process in each working part was greater than that of personal working process. 3. Time of exposure to noise complex working process the part of porcelain 150min, partial denture 120 min, crown and bridge 100 min, full denture 80 min. 4. Degree of noise by time in dental laboratory was 80dB in general for polishing process and below 75dB for waxing process. 5. Effects of noise on mental and emotional state of dental technicians showed that they felt irritated every day(14%), irritated once in a while(29%) and easily ger mad(19%). 6. Effects of noise on heart and stomach were hyper-gastric acid(38%), gastric ulcer(11%), gastritis(5%), deuodenal ulcer(3%) and weak heart function(32%). 7. Effects of noise in the hearing ability were weak(39%), moderate(33%) and normal(14%) Data presented in this study demonstrated that noise in the dental laboratory exerts profound effect on dental technicians mentally, physiologically and emotionally, in light of the above results, therefore, it appears advisable to devots substantial on the management of working condition and put further(continuing) efforts in the investigation for reducing noise problem.

Pervaporation Performance of Polyacrylic acid Blend Membrane

남상용,하성용,이영무 ( Sang Yong Nam,Seong Yong Ha,Young Moo Lee ) 한국공업화학회 1996 한국공업화학회 연구논문 초록집 Vol.1994 No.1

도재소부용 금합금에서 인듐, 주석 첨가가 금속-도재계면 특성에 미치는 영향

남상용,곽동주,정석민,Nam, Sang-Yong,Kwak, Dong-Ju,Chung, Suk-Min 대한치과기공학회 2001 대한치과기공학회지 Vol.23 No.1

This study was performed to observe the micro-structure change of surface, behavior of oxide change of element, the component transformation of the alloy and the bonding strength between the porcelain interface in order to investigate effects of indium, tin on interfacial properties of porcelain fused to low gold alloy. Hardness of castings was measured with a micro-Vicker's hardness tester. The compositional change of the surface of heat-treated specimen was analyzed with an EDS and an EPMA. The interfacial shear bonding strength between alloy specimen and fused porcelain was measured with a mechanical testing system(MTS 858.20). The results were as follows: 1) The hardness value of alloy increased as increasing amount of indium addition. 2) The formation of oxidation increased as increasing indium and tin contents after heat treatment. 3) Diffusion of indium and tin elements increased as increasing indium and tin contents in metal-porcelain surface after porcelain fused to metal firing. 4) The most interfacial shear bonding strength was increased as increasing a composition of adding elements, and a heat-treatment time, and an oxygen partial pressure. From the results of this study it was found that the addition of alloying elements such as indium and tin increase hardness of as-cast alloy, produce surface oxide layer of adding elements by heat-treatment which may improve interfacial bonding strength between alloy and porcelain.

Gas Barrier성 SEBS (Styrene Ethylene Butadiene Styrene Copolymer)-Clay 하이브리드 막의 제조 및 물성

남상용,염봉열,민병렬,김영진,Nam Sang Yong,Yeom Bong Yeol,Min Byoung Ryul,Kim Young Jin 한국막학회 2005 멤브레인 Vol.15 No.1

본 연구에서는 SEBS와 여러 가지의 유기화물로 처리된 MMT (montmorillonite) type의 clay를 이용하여 SEBS-clay 하이브리드 막을 용융삽입법으로 제조하였다. clay의 함량은 5 phr (per hundred resin)로 고정하였다. internal mixer를 사용하여 clay를 SEBS에 분산시켰으며, 제조된 SEBS-clay 하이브리드에서 clay의 특성피크가 완전히 박리되거나 이동하는 XRD 결과로부터 clay의 층간거리가 넓어지는 고분자의 clay 층간삽입을 확인하였다. Clay의 종류에 따라서 제조된 SEBS-clay 하이브리드 막의 가스투과도, 기계적 물성 및 열적 성질을 측정하였다. SEBS-clay 하이브리드 막은 clay 자체의 도입과 층간거리의 확대로 기체분자의 tortuosity를 증가시켜서 가스투과도를 저하시키는 것을 확인하였다. SEBS-clay hybrid membranes were prepared by melt intercalation method with internal mixer. In the hybrid, the amount of clay content was fixed to 5 phr. MMT was intercalated or exfoliated by the ionomer and it was confirmed by X-ray diffraction method. D-spacing of the characteristic peak from MMT plate in SAXD was moved and diminished. Gas permeability, mechanical properties and thermal properties of the SEBS-clay hybrid membranes were investigated. Gas permeability through the SEBS-clay hybrid membranes decreased due to increased tortuosity made by intercalation of clay in SEBS.

도재용 Ni-Cr 합금표면의 열처리후 원소성분 변화

남상용,Nam, Sang-Yong 대한치과기공학회 1995 대한치과기공학회지 Vol.17 No.1

This study was carried out by obsorving to the conditions of an oxide on the surface of alloy according to the conditions of its heat treatment and analysing the change in composition on its surface. The result of this study is summarized as fellows. 1. It was shown that the higher the more the generated metal oxide while the higher the temperature of heat treatment. 2. The metal oxide was manily composed of Ni and Cr oxides. 3. The Ni composition indicated reduction while the higher the heat treatment in vaccum condition. 4. The Cr composition indicated increase while the higher the heat treatment in vaccum condition.

수출 접목선인장 산취 ‘희망’의 주ㆍ야 온도 및 LED광 처리가 모구 생육과 발색에 미치는 영향

남상용(Sang-Yong Nam),박선미(Sun-Mi Park),안동현(Dong-Hyun Ahn) (사)한국생물환경조절학회 2010 생물환경조절학회지 Vol.19 No.3

본 연구는 4개의 생육상에서 주간은도 20℃와 25℃, 야간온도 5, 10, 15, 20℃의 주ㆍ야 온도 조합과 적색LED, 청색LED, 분홍LED(청색LED+적색 LED), 백색LED 4종의 발광다이오드(LEDs)를 조사하여 산취(Chamecereus silvestrii f. variegata)선인장 ‘희망’의 모구 생육 및 발색에 가장 효과적인 재배환경을 찾고자 실시하였다. 주ㆍ야 온도처리가 황색 모구의 고유색 발현에 미치는 영향은 명도(L<SUP>*</SUP>값), 적색도(a<SUP>*</SUP>값), 황색도(b<SUP>*</SUP>값)가 모두 유의성이 있으며 특히 주간온도 20℃와 야간온도 20℃에서 모구색이 선명한 황색으로 관상가치가 가장 높았고, 주간온도 25℃와 5℃, 10℃ 각각의 야간온도에서 모구색 품질이 저하되는 것으로 나타났다. 발광다이오드(LEDs) 처리는 a<SUP>*</SUP>값과 b<SUP>*</SUP>값에서 유의적 차이가 있으며 적색LED에서 a<SUP>*</SUP>값은+5.23, b<SUP>*</SUP>값은 +39.9로 산취선인장의 고유의 아름다운 황색 발색을 유지하며 구색품질이 가장 좋았다. 따라서 산취선인장의 모구색 발현에 영향을 주는 최적 온도범위와 발광다이오드(LEDs)는 주간온도 20℃와 야간온도 20℃이며 단색광인 적색LED에서 가장 효과적이었다. 또한 산취선인장 재배에서 모구색의 외적 품질 향상은 적정 온도 환경 유지보다는 광질 환경을 개선하는 것이 보다 효율적이며 특히 발광다이오드(LEDs) 적색LED가 황색계통의 고유한 모구색 발현에 효과적인 것으로 나타났다. This experiment was conducted to find the day and night temperature combination and the light-emitting diodes (LEDs) on the most effective globe coloration and growth of Chamecereus silvestrii f. variegata 'Hee-Mang'. The L<SUP>*</SUP>value, a<SUP>*</SUP>value and b<SUP>*</SUP>value were all significant difference in the yellow globe color expression in the day and night temperature combination. Especially, the bright yellow color and visual value were the highest in the temperature combination, the day temperature of 20℃ and night temperature of 20℃. Globe color quality was lowered from the day temperature of 25℃ and night temperatures of 5℃ and 10℃ combination. In light-emitting diodes (LEDs) treatments, a<SUP>*</SUP>value and b<SUP>*</SUP>value are significant difference. A unique beautiful yellow coloration and globe quality were maintained the a<SUP>*</SUP>value of +5.23, b<SUP>*</SUP>value of +39.9 in a red LED. The optimum temperature range and light-emitting diodes (LEDs) on the globe color expression were the most effective the day temperature of 20℃ and night temperature of 20℃ and a red LED. In addition, the outer globe color quality of Chamecereus silvestrii f. variegata cultivation, rather than the light environment improvement is better in a proper temperature environment to keep. Especially, a unique globe color expression of yellow lines was most effective in a red LED.

Hydroponically Grown Grafted Cactus as affected by Shading and Nutrient Solution Concentration

Sang Yong Nam(남상용),Raisa Aone Cabahug(라이사),Sammuel Lee(이사무엘) 한국원예학회 2015 한국원예학회 학술발표요지 Vol.2015 No.10

감자의 생육 및 괴경수량에 미치는 소괴경 크기의 영향

南相用(Nam Sang-Yong),蘇昌鎬(Soh Chang-Ho) 한국생물환경조절학회 1998 한국생물환경조절학회 학술발표논문집 Vol.7 No.1

培養液 溫度 및 遮光정도가 청치마 상추의 生育에 미치는 영향

남상용(Nam Sang-Yong),권용웅(Kwon Yong-Woong) (사)한국생물환경조절학회 1997 생물환경조절학회지 Vol.6 No.4