기계적 합금화에 의한 Al-Fe 및 Al-Fe-Ce 합금의 고온 변형거동

김선진,이도인,안인섭,허보영,조권구 국립경상대학교 공과대학 부설 첨단소재연구소 1992 尖端素材 Vol.2 No.-

The deformation behavior of a mechanical alloyed Al-Fe and Al-Fe-Ce alloy was studied in the temperature range of 300℃ to 500℃. The steady state for Al-8wt.%Fe powder was obtained after 1000 minutes of mechanical alloying at the process condition of 2wt.% stearic acid, 46:1 of grinding media/powder weight ratio, and 300 rpm of impeller revolving velocity. The relative densities of Al-8wt.%Fe alloy powders reached almost 100% after 1 hour sintering at 470℃ under vacuum state. With increasing the amount of PCA, hardness of the sintered alloys increased but the relative densities were not affected. It was also found that decrease in hardness and tensile strength after high temperature aging treatment was reduced with increasing the amount of Ce addition.

기계적합화법으로 제조된 TiNi 분말의 방전플라즈마 소결에 관한 연구

김윤호,강지훈,김지순,안인섭,권영순 울산대학교 1999 공학연구논문집 Vol.30 No.2

기계적합금화법(MA)에 의해 제조된 TiNi 분말을 사용하여 방전플라즈마 소결법(SPS)으로 소결체를 제조하고 치밀화 거동을 조사하기 위하여 미세조직의 관찰 및 상분석을 행하였다. SPS법으로 소결체를 제조한 결과, 통상적인 소결법으로 소결체를 제조하였을 때 보다, 낮은 온도와 짧은 시간의 유지시간에서 이론 밀도의 99% 가까운 소결체 밀도를 얻을 수 있었고, 소결체의 상은 B2구조의 cubic과 2차상으로 Ti₂Ni가 존재함을 확인하였다. Mechanically-alloyed TiNi powders were densified by Spark-Plasma Sintering(SPS) method. The densififcation behavior was investigated throgh the microstructural observation, the phase analysis and the measurement of change in devsity, linear shrinkage and densification rate as a function of temperature. Sintered body with close to 99% relative density was obtained at lower sintering temperature for shorter holding time in comparison to the conventional sintering methods. TiNi with B2 structure was confirmed as the major phase and Ti₂Ni as the second phase.

機械的 合金化된 Al-Fe合金의 組織 및 加工特性

安仁燮 慶尙大學校 1991 論文集 Vol.30 No.2

A new process called "Mechanical alloying(MA)" which produces homogeneous alloy particles with a uniformly dispersed internal structure has been used to make Al-8wt.% Fe alloys. The effects of the amount of precess control agent and mechanical alloying time on the microstructure and mechanical properties were investigated. Powders prepared by MA method was sintered by vacuum hot pressing. Workability was investigated with adding hot forging at 470℃. Hardness was increased with adding the amount of process control agent. The workability was limited to 26% at the 5 times hot forging and was increased as increasing relative density.

당뇨병 환자에서 Tc - 99m - DISIDA Scintigraphy 를 이용한 담낭의 기능분석

황인섭(In shup Hwang),류광현(Kwang Hyun Rhu),김홍남(Hong Nam Kim),노영호(Young Ho Rho),한신(Sin Han),김윤권(Youn Kwon Kim),김소연(So Yon Kim),조민구(Min Koo Cho),이권전(Gwon Jun Lee) 대한내과학회 1998 대한내과학회지 Vol.54 No.4

N/A Objectives : Diabetic autonomic neuropathy is a common complication of long standing diabetes mellitus and is well known to induce the motor dysfunction of cardiovascular system, genitourinary system and digestive system. Although many studies have done to evaluate the diabetic autonomic neuropathy, gallbladder motor function and biliary dynamic study to evaluate the change of gallbladder function in diabetic patients is relatively rare. This study was performed to measure the gallbladder ejection fraction using Tc- 99m-DISIDA with fatty meal in order to evaluate the gallbladder motor function in diabetic patients and to examine the usefulness of it in analyzing diabetic autonomic neuropathy. Methods : 51 diabetic patients(males 31, females 18, mean age 57yr(36-77yr)) and 1H control subjects(males 14, females 4, mean aged 47yr(31-70yr)) without gallstone and impaired liver function were enrolled in our study. Also the diabetic patients were categorized by age, disease duration, body weight and diabetic complications such as retinopathy, peripheral neuropathy and cardiovascular autonomic neuropathy accompanying with or not. Results : 1) Median value and interquartile range of gallbladder ejection fraction(%) were 66%(48-79%) in diabetic patients group and 75%(64-80%) in control subjects. There was no statistically significant difference between the two groups, but the mean value of diabetic patients was slightly lower than that of control subjects. 2) There was no significant difference between the two groups in mean value of gallbladder ejection fraction in every age group(P>0.05). 3) Median value of gallbladder ejection fraction in diabetic groups with less than 10 years of duration (both under 5 years and 5 to 10 years groups) was similar to that of control subjects. However in patients whose diabetic conditions last more than 10 years, the median range of gallbladder ejection fraction was significantly lower than that of control subjects(P<0.05). 4) Median range of gallbladder ejection fraction in obese diabetic patients group was significant lower than those of control subjects and non- obese diabetic patients(p<O.C6). 5) Median value of gallbadder was lower in diabetic patients group with complications like retinopathy, peripheral neuropathy or cardiovascular autonomic neuropathy (p<0.05) in comparison with those of control subjects and diabetic patients group without diabetic complication (p>0.05). Also seven diabetic patients whose gallhladder ejection fraction was reduced under,35% have had at least two diabetic complications. Conclusion : We observed that gallbladder ejection fraction of diabetic patients was reduced compared with that of control subjects. This is due to the reduced gallbladder muscle contractility resulting from diabetic autonomic dysfunction. These results suggest that the assessment of gallbladder ejection fraction using 99m- Tc-DISIDA would be useful to diagnose diabetic autonomic neropathy.

CP와 TDN 수준이 육성기 유산양의 건물섭취량, 소화율과 질소 및 에너지 이용성에 미치는 영향

기광석(Kwang Seok Ki),임영순(Young Soon Lim),김택림(Ze Lin Jin),이현준(Hyun June Lee),김상범(Sang Bum Kim),이왕식(Wang Shik Lee),양승학(Seung Hak Yang),조원모(Won Mo Cho),김현섭(Hyeon Shup Kim),여준모(Joon Mo Jeo),이인덕(In Duk Lee) 韓國草地學會 2009 한국초지조사료학회지 Vol.29 No.3

유산양의 에너지 및 단백질 이용성을 조사하기 위하여 대조구(A), TDN 증량구(B), 조단백질 증량구(C) 그리고 TDN 및 조단백질 증량구(D)로 구분하여 섭취량, 소화율과 질소 및 에너지 이용성을 시험하였다. 공시축은 유산양(Saanen, 평균체중 17.5㎏, ♀) 12두를 공시하였고, 2008년 10월 20일부터 11월 9일까지 충남대학교 부설동물사육장에서 수행하였다. 건물섭취량은 D구에서 가장 높았으며 B구가 C구보다 유의적으로 높은 섭취율을 보였다(p<0.05). 건물 소화율 및 세포내용물의 소화율은 A구에 비하여 영양성분을 증량한 B구와 C구 및 D구가 모두 유의적으로 높은 결과를 보였으며(p<0.05), D구가 가장 높고 B구가 C구보다 높은 수준을 보였다. NDF 소화율은 A구에 비하여 영양성분을 증량한 처리구들에서 모두 높았고, ADF 소화율은 A구와 C구가 B구와 D구보다 다소 높은 결과를 보였는데 유의적인 차이는 없었다. 가소화 및 대사질소량은 섭취량과 유사한 경향으로 D구에서 가장 높았으며, C구 보다는 B구가 유의적으로 높은 수준을 보였다(p<0.05). 가소화에너지와 대사에너지도 D구에서 가장 높았으며 C구 보다는 B구가 유의적으로 높은 수준을 보였다(p<0.05). 이상의 결과들은 조단백질만을 증량하는 것보다는 TDN 수준과 함께 조단백질수준을 증량시켜주거나 또는 TDN 수준을 증량시키는 것이 건물소화율 및 질소이용성과 에너지이용성을 향상시키는데 더 효과적이라는 결과를 보였다. This experiment was carried out to investigate the effects of increases of nutrient level of TMR on dry matter intake, digestibility, nitrogen and energy balance in growing dairy goats (Saanen). Twelve growing dairy goats weighing 17.5㎏ were randomly assigned to one of four TMRs; low energy-low crude protein (CP) TMR (control; A), high energy-low CP TMR (B), low energy-high CP TMR (C) and high energy-high CP TMR (D). The content of total digestible nutrients (TDN) and CP in the control diet were 67% and 11%. The TDN content of the high energy TMR was 73.7% and the CP content of the high CP TMR was 13%. Dry matter intake was highest in D, and significantly higher in B than in C (p<0.05). Digestibility for dry matter and cell contents increased in proportion to dry matter intake. NDF digestibility was higher in D than in A, while ADF digestibility was higher in A and C than in B, but was not significant. Digestible nitrogen, apparently digested nitrogen and retained nitrogen were correlated with intake, and significantly higher in B than in C (p<0.05). Digestible energy and metabolizable energy were highest in D, and significantly higher in B than in C (p<0.05). Therefore, the present results showed that D or B were better than C for high intake, digestibility, nitrogen and energy utilization.

STS 316L 소결재료의 내식특성에 미치는 합금원소 첨가방법의 영향

김혜성,김유영,박동규,안인섭,Kim, Hye Seong,Kim, Yoo Young,Park, Dong Kyu,Ahn, In Shup 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.3

In this study, STS 316L powders with 3 wt.% Cu and 1 wt.% Sn known as corrosion-resistance reinforcement elements, are prepared to make different kinds of specimens, in which, 3 wt.% Cu and 1 wt.% Sn are added in different forms by mixing, alloying and fully alloying. After sintering in the same condition, the corrosion resistance, wear resistance and their mechanical properties of specimens are tested respectively. According to the comparison, STS 316L specimen sintered at $1270^{\circ}C$ showed the most excellent mechanical property: HRB 78 (hardness), 1130.7 MPa (RCS), 26.6% (Fraction Wear), It was similar with the specimen made of STS316L and fully alloyed Cu and Sn powders, meanwhile, the latter one appears the best corrosion resistance, 75hrs-salt immersion test results. In addition, the specimens with Cu and Sn powders additive showed relatively worse wear resistance in compared with STS316L specimen.

ZnS 형광체 분말제조를 위한 기계적합금화법의 응용 연구

안인섭,정우현,배승열,성택경,박동규,Ahn In-Shup,Chong Woo-Hyun,Bae Sung-Yeal,Sung Tek-Kyoung,Park Dong-Kyu 한국분말야금학회 2005 한국분말재료학회지 (KPMI) Vol.12 No.4

In this study, the ZnS composite powders for host material in phosphor was synthesized in situ by mechanical alloying. As the mechanical alloying time increases, particle size of ZnS decreases. ZnS powders of $1.85\;\mu{m}$ in a mean size was fabricated by mechanical alloying for 10h. The crystal structures of ZnS powders were investigated by X-ray diffraction and the photo-luminescence properties was evaluated with the optical spectra analyzer. The steady state condition of mechanically alloyed ZnS was obtained as a mean particle size of $2\;\mu{m}$ in 5h milling. The sphalerite and wurtize structures coexist in the ZnS mechanically alloyed for 5h. The ZnS powder mechanically alloyed for 10h grows to the sphalerite structure. And the strong emission peaks of ZnS are observed at 480 nm wave length at the powders of mechanically alloyed for 10h, but the sphalerite and wurtize structures in ZnS coexist and emission peaks are not appeared at the powders of mechanically alloyed for 10h.

Properties and Application of Metal Sulfide Powder

Park Dong-Kyu,Bae Sung-Yeal,Ahn In-Shup,Jung Kwang-Chul 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

Metal sulfide powders such as MnS, MoS2 and FeS are simply used to the machinery processing improvement agent and solid lubricant in powder metallurgy industrial. And then, metal sulfide powders have received relatively little attention from powder metallurgy. Recently, the portable machine is one of the important interfaces between human or human and electronic machine. With the increase of the intelligent activity, the social and industrial demands for information display device and power source are increasing. The transition metal sulfide materials (FeS, ZnS) have received considerable attention due to the large variety of its electric, optical and magnetic properties. Among the metal sulfide, FeS2 is appealing superior material for applications in Li-2nd battery because of high capacity. ZnS is also a famous phosphor material with various luminescence properties, such as photoluminescence (PL) and electroluminescence (EL). So generally used in the fields of display, sensors and laser. Metal sulfide materials, therefore, are provided for most widely application in all industries. In recent years, material researchers have become increasingly interested in studying with synthesis of metal sulfide.

TMR의 에너지 및 단백질 수준이 비유초기 유산양의 유생산성에 미치는 영향

기광석(Kwang Seok Ki),이현준(Hyun June Lee),김상범(Sang Bum Kim),이왕식(Wang Shik Lee),임동현(Dong Hyun Lim),임현주(Hyun Joo Lim),박성재(Sung Jai Park),조원모(Won Mo Cho),김현섭(Hyeon Shup Kim),김택림(Ze Lin Jin),이인덕(In Duk Lee),김 한국초지조사료학회 2010 한국초지조사료학회지 Vol.30 No.3

본 시험은 섬유질배합사료 (TMR)의 에너지 및 단백질 수준이 다를 경우, 비유초기 유산양의 사료섭취량 및 유생산에 미치는 영향을 조사하기 위하여 수행하였다. 시험 동물은 자넨종 생후 16개월령 전후의 초산 착유양 24두 (♀)를 시험구별 6마리씩 공시하였으며, TMR의 에너지와 단백질 수준은 대조구 (Control)가 TDN 67.0%, CP 13.9% (NRC, 2007), 에너지 증량구 (T1)는 TDN 73.7%, CP 13.9%, 단백질 증량구 (T2)는 TDN 67.0%, CP 15.3%, 에너지+단백질 증량구 (T3)가 TDN 73.7%, CP 15.3%의 네 처리구로 나누었다. 연구결과 비유초기 유산양의 급여하는 사료내 에너지 수준을 NRC 보다 약 10% 정도 높여줄 경우, 유생산량 증가에 영향을 미치지 않아 비유초기 과도한 에너지 증량은 오히려 사료비를 증가시키는 요인이 될 수 있다는 것을 보여준다. 그러나 비유초기 일당 증체량은 에너지 증량구 (T1)와 에너지+단백질 증량구 (T3)에서 증가하였으나, 대조구와 단백질 증량구 (T2)에서는 감소한 것으로 나타나 비유초기 에너지 수준을 높여주는 것이 체중감소를 예방하는데 도움이 될 것으로 생각된다. 또한 에너지 함량의 증가 없이 단백질 함량만의 증가는 오히려 섭취량 및 유생산을 감소시켰기에 비유초기 과도한 단백질 증가 역시 필요하지 않다는 것을 보여준다. 이상의 결과를 종합적으로 분석해 보면, 비유초기 가소화 탄소화물의 과도한 증가가 유생산성에는 영향을 미치지 않은 것으로 나타났으나 체중저하를 방지하는데 도움이 되었다는 것을 보여주고 있다. The objective of this experiment was to investigate effects of total mixed ration (TMR) of different nutrition level on milk production in dairy goats (Sannen). Twenty four lactating goats were randomly assigned to one of four TMRs; medium energy-medium crude protein (CP) TMR (control), high energymedium CP TMR (T1), medium energy-high CP TMR (T2) and high energy-high CP TMR (T3). The content of total digestible nutrients (TDN) and CP in the control diet were 67.0% and 13.9%. The TDN content of the high energy TMR was 73.7% and the CP content of the high CP TMR was 15.3%. Milk yield was significantly (P<0.05) higher for T1 (2,198±115 ㎖) than for T2 (1,742±52 ㎖) and T3 (1,984±90 ㎖). But there were no significant differences in milk composition between the treatments. Daily body weight gain was increased in T1 and T3 but reduced in control and T2. The result of the present study showed that dietary energy level supplied more than that of NRC recommendation did not affect milk yield of dairy goats in early lactation but prevented body weight loss.

Fe-(Mo,Mn)-P계 Lean alloy의 소결특성에 미치는 Si와 Sn의 영향

정우영,옥진욱,박동규,안인섭,Jung, Woo-Young,Ok, Jin-Uk,Park, Dong-Kyu,Ahn, In-Shup 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.4

A lean alloy is defined as a low alloy steel that minimizes the content of the alloying elements, while maintaining the characteristics of the sintered alloy. The purpose of this study is to determine the change in microstructure and mechanical properties due to the addition of silicon or tin in Fe-Mo-P, Fe-Mn-P, and Fe-Mo-Mn-P alloys. Silicon- or tin-added F-Mo-P, Fe-Mn-P, and Fe-Mo-Mn-P master alloys were compacted at 700 MPa and subsequently sintered under a $H_2-N_2$ atmosphere at $1120^{\circ}C$. The sintered density of three alloy systems decreases under the same compacting pressure due to dimensional expansion with increasing Si content. As the diffusion rate in the Fe-P-Mo system is higher than that in the Fe-P-Mn system, the decrease in the sintered density is the largest in the Fe-P-Mn system. The sintered density of Sn added alloys does not change with the increasing Sn content due to the effect of non-dimensional changes. However, the effect of Si addition on the transverse rupture strengthening enhancement is stronger than that of Sn addition in these lean alloys.