전기로(電氣爐) 환원(還元) 슬래그의 수화반응(水和反應) 특성(特性) 연구(硏究)

안용준,한인규,최재석,배광현,김형석,An, Yong-Jun,Han, In-Kyu,Choi, Jae-Seok,Bae, Kwang-Hyun,Kim, Hyung-Seok 한국자원리싸이클링학회 2010 資源 리싸이클링 Vol.19 No.6

본 연구에서는 전기로 환원슬래그를 시멘트 혼화재로 이용하였을 때의 전기로 환원슬래그의 수화반응 특성과 압축강도 특성을 연구하였다. 전기로 환원슬래그에는 17.1%의 f-CaO 및 속경성 클링커 광물인 37.1%의 $C_{11}A_7CaF_2$와 21.0%의 $Ca_3A$가 함유되어 있었다. 보통 포틀랜드시멘트(OPC, Ordinary Portland Cement)에 전기로 환원슬래그를 30%까지 치환할 경우, 초결 및 종결시간이 각각 305분과 425분에서 10분과 30분으로 단축되는 급결성을 보였다. OPC에 전기로 환원슬래그의 치환량이 7%까지 증가됨에 따라 혼합시멘트의 압축강도는 OPC보다 높아졌으나, 7%이상에서는 점차 압축강도가 낮아져 20%이상 치환하였을 때에는 OPC보다 초기강도 및 장기강도가 모두 낮았다. 전기로 환원슬래그 자체의 수화반응 생성물을 조사한 결과, $C _{11}A_7CaF_2$는 물과 반응하여 $C_3AH_6$로 변화되었다. 그러나 OPC에 환원슬래그를 치환하여 사용할 경우, 환원슬래그의 치환율이 높아짐에 따라 f-CaO가 많아지고 준안정성의 수화물인 $C_4AH_{13}$의 생성량이 증가되기 때문에 OPC에 환원슬래그를 7%미만으로 치환하여 사용해야만 안정된 경화체를 형성하여 압축강도가 OPC보다 높아졌다. In this study, we have studied hydration properties and compressive strength of the electric arc furnace reduction slag as a cement admixture. The reduction slag is mainly consisted of 17.1% of f-CaO and rapid curing clinker minerals, 37.1% of $C_{11}A_7CaF_2$, and 21.0% of $C_3A$. When the substitution rate of the slag on OPC was 30%, the initial setting time and final setting time has been shortened from 305 min. and 425 min. to 10min. and 30min. When the substitution rate of the slag on OPC was 7%, the compressive strength of mixed cement mortars has been increased than that of OPC during all period. When the substitution rate of the slag on OPC was over 20%, the compressive strength of mortars has been reduced than that of OPC at initial and final compressive strength. As a result of hydration properties of reduction slag, $C_{11}A_7CaF_2$ transfer to $C_3AH_6$ but as the substitution rate of slag on OPC increases, increased f-CaO and the metastable hydrates $C_4AH_{13}$ increased. Therefore, we should control the substitution rate of the slag on OPC was under 7% in order to use EAF reduction slag as a cement admixture.

비만과 정상체중여성들의 저주파치료기(Slim line)에 의한 체지방율 평가(1)

안용준(An Yong Jun),김학렬(Kim Hag Lyeol),손연희(Son Yeon Hui),박성률(Park Seong Lyul),최옥경(Choe Og Gyeong),김영란(Kim Yeong Lan) 한국사회체육학회 2003 한국사회체육학회지 Vol.20 No.2

The purpose of this study was to estimated a reliability and a validity of SLIM LINE(Bionixs Co.Korea) as comparison to %body fat difference between bioelectrical impedance analysis(BIA), Skinfold caliper technique(SCT) and slim line measurement (SLM) in obesity and non-obesity women. The results and conclusion is obtained as follows 1. Percent fat of obesity group by three measurement technique was shown a significant difference between SCT vs. BIA, SLM(p<.001) in pre and after 1 month treatment, but no significant difference between BIA vs. SLM. Also, It was shown a significant difference between SCT vs. BIA after 2 month(p<.001), 3 month(p<.05) and 4 month(p<.05), but no significant difference between SCT vs. SLM and BIA vs. SLM. Percent fat of normal group was present a significant difference between BIA vs. SLM(p<.05) only pre treatment, but no significant difference between the other treatment 2. Fat mass of obesity group by three measurement technique was shown a significant difference between SCT vs. SLM(p<.01) in pre and after 1 month treatment, but no significant difference between SCT vs. BIA and SLM vs. BIA. Also, It was not shown a significant difference between three measurement technique after 2 month and 3 month, but it was significant difference between BIA vs. SLM(p<.05) after 4 month treatment. Fat mass of normal group was not present a significant difference between three measurement technique in pre and after 1 month treatment, but it was shown a significant difference between BIA, SCT vs. SLM after 2 month(p<.01), after 3 month(p<.001) and after 4 month(p<.001) treatment. However, no significant difference between BIA and SCT. 3. Fat free mass of obesity group by three measurement technique was not shown a significant difference in pre, after 2 month and 3 month treatment, but it was shown a significant difference between SCT vs. SLM after 1 month(p<.05) and 4 month(p<.05). However, no significant difference between BIA and SLM. Fat free mass of normal group was not significant difference between three measurement technique. As results above, It is demonstrates that the estimation of %body fat by slim line may offer an exact advantage over SCT and BIA.

전자기 저항을 이용한 압전 구동방식 마이크로 펌프의 내부유동 특성과 펌핑성능에 대한 수치해석적 연구

안용준(Yong Jun An),오세홍(Se Hong Oh),김창녕(Chang Nyung Kim) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.10

In this study a numerical analysis has been conducted for the flow characteristics and pumping performance of a piezoelectric-based micropump with electromagnetic resistance exerted on electrically conducting fluid. Here, electromagnetic resistance is alternately applied at the inlet and outlet with alternately applied magnetic fields in association with the reciprocal membrane motion of the piezoelectric-based micropump. A model of Prescribed Deformation is used for the description of the membrane motion. The internal flow characteristics and pumping performance are investigated with the variation of magnetic flux density, tube size, displacement of membrane and the frequency of the membrane. It turns out that the current micropump has a wide range of pumping flow rate compared with diffuser-nozzle based micropumps.

휴대기기에서의 안테나 반사 신호를 이용한 심박 신호 검출

안용준(Yong-Jun An),윤기호(Gi-Ho Yun),육종관(Jong-Gwan Yook) 한국통신학회 2013 韓國通信學會論文誌 Vol.38 No.7(융합기술)

전자기 전항을 이용한 압전 구동방식 마이크로 펌프의 유동 및 성능 특성에 관한 수치해석적 연구

안용준(Yong Jun An),최청렬(Chung Ryul Choi),김창녕(Chang Nyung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

A numerical analysis has been conducted for flow characteristics and performance of a micropump with piezodisk and MHD(Magnetohydrodynamics) fluid. Various micro systems which could not be considered in the past have been recently growing with the development of MEMS(Micro Electro Mechanical System) and micro machining technology. Especially, micropumps, essential part of micro fluidic devices, are being lively studied by many researchers. In the present study, the piezo electric micropump with electromagnetic resistance for electrically conducting fluids is considered. The prescribed grid deformation method is used for the displacement of the membrane. The change of the performance of the micropump and flow characteristics of the electrically conducting fluid with the magnitude of the magnetic fields, duct size, the position of the inlet and outlet duct are investigated in the present study.

고엽제 환자 2세들의 질병현황과 고엽제와의 연관성에 관한 고찰

김학준(Hag Jun Kim),전진숙(Jin Suk Cheon),김오길(Oh Kil Kim),이건호(Gun Ho Lee),안용준(Yong Jun An),하준호(Jun Ho Ha),변상준(Sang Jun Byeon),이상룡(Sang Ryong Lee),김순관(Sun Kwan Kim),오경석(Kyung Seok Oh) 대한내과학회 2000 대한내과학회지 Vol.58 No.2

N/A Background : This is the studies about If the soldiers expose in the paraquat, how much have it influenced on themselves who participated in the Vietnam War and their second generation? and this is also researched about the factors that How differents do the symptoms according to their health conditions and a class of diseases?. First of all, We divided them into 3 groups as exposure duration and exposure degree of the paraquat and We gave marks against each steps, too. (< point 10: low group, point 11-19: middle group, > point 20: high group). We've focused in Does the high score really involves with their descendants who suffers from paraquat? as direct damages men during from June 1965 to February 1971 (72 persons) and their descendants (266 persons) who are in the Pusan veterans hospital and outpatients. Methods : It is completed by direct interview, telephone interview, army records, army history, and medical records with them. We've tried to minify sample bias as analyzing their information. We could contact only a few people among living in Pusan or Kyongnam province. Generally, someone including persons who couldn't get a damaging proofs from paraquat hardly joined us and the others strongly rejected the interview for this research. Results : Among the 72 participating soldiers in the Vietnam war, average age of patient is 53 years old (the youngest: 46 years old, the oldest: 64 years old), average of exposure score is 16 point (minimum: 1.9 point, maximum: 31.9 point), average of pregnant frequency is 5.2 persons, and average degree of smoking is 14.382 single cigarette (minimum: 4 single cigarette, maximum: 60 single cigarette). The second generation is suffering from abortion, skin disorder, still birth, congenital anomalies, weakness, visual disturbance, peripheral neuropathy in frequency. Conclusion : There's no relation between exposure score of paraquat and diseases of the descendants. (Korean J Med 58:221-226, 2000)

주파수 체배기와 PLL을 이용한 10 GHz 생체 신호 레이더 시스템

명성식,안용준,문준호,장병준,육종관,Myoung, Seong-Sik,An, Yong-Jun,Moon, Jun-Ho,Jang, Byung-Jun,Yook, Jong-Gwan 한국전자파학회 2010 한국전자파학회논문지 Vol.21 No.2

본 논문에서는 주파수 체배기와 위상 동기화 회로(Phase-Locked Loop: PLL)를 이용한 주파수 합성기를 이용한 10 GHz 대역에서 동작하는 생체 신호 레이더를 제안하였다. 제안된 10 GHz 대역 생체 레이더는 2.5 GHz 전압 제어 발진기와 PLL을 이용하여 발생된 위상 잡음 특성이 매우 뛰어나고 안정적인 정현 신호를 이용하여 뛰어난 생체 신호 검출 성능을 보인다. 또한 10 GHz 대역에서 PLL을 구현하기 어려운 점을 해결하기 위하여 2.5 GHz 대역에서 PLL을 이용하여 발생된 신호를 주파수 체배기를 이용하여 10 GHz 대역 신호를 발생시키는 방법을 제안하였다. 본 논문에서는 제안된 구조의 생체 레이더의 잡음 특성을 이론적으로 분석하여 제안된 구조의 타당성을 검증하였다. 실험 결과 100 cm까지 매우 우수한 생체 신호 검출이 가능하였으며, 이로서 제안된 구조의 10 GHz 대역의 생체 레이더의 타당성을 확인하였다. This paper presents a novel 10 GHz bio-radar system based on a frequency multiplier and phase-locked loop(PLL) for non-contact measurement of heartbeat and respiration rates. In this paper, a 2.5 GHz voltage controlled oscillator (VCO) with PLL is employed to as a frequency synthesizer, and 10 GHz continuous wave(CW) signal is generated by using frequency multiplier from 2.5 GHz signal. This paper also presents the noise characteristic of the proposed system. As a result, a better performance and economical frequency synthesizer can be achieved with the proposed bio-radar system. The experimental results shows excellent bio-signal measurement up to 100 cm without any additional digital signal processing(DSP), and the proposed system is validated.

비만과 정상체중 여성들의 체지방율 감량을 위한 규칙적인 저주파치료기(Slim line)처치에 대한 효과(2)

김학렬(Kim Hag Lyeol),안용준(An Yong Jun),손연희(Son Yeon Hui),박성률(Park Seong Lyul),최옥경(Choe Og Gyeong),김영란(Kim Yeong Lan) 한국사회체육학회 2003 한국사회체육학회지 Vol.20 No.2

The purpose of this study was examine the effect of body fat reduction and body composition through regular SLIM LINE treatment in 30-40 old years obesity and non-obesity women. The results and conclusion of this paper obtained as follows. 1-1. In the SLIM LINE treatment during four month of obesity group, %fat was shown a gradually decreased levels follows time course compared to baseline levels, It was proved a significantly decreased levels(p〈.05) after 4 month treatment during bioelectrical impedance analysis(BIA). 1-2. In the SLIM LINE treatment during four month of obesity group, body density was significantly increased(p〈.05), but %body fat was shown a significantly decreased(p〈.05) during skinfold caliper technique(SCT). 1-3. In the SLIM LINE treatment during four month of obesity group, %body fat was shown a gradually decreased levels. that is, pre vs. after 3 mo and 4 mo(p<.001, respectively); after 1 mo vs. after 4 mo(p<.001). As this results, it was proved a same effect(pre vs. after 3 mo and 4 mo(p<.001, respectively); after 1 mo vs. after 4 mo(p<.001)) in fat mass(FM) during slim line measurement(SLM) 2. The SLIM LINE treatment during 4 month of non-obesity group was not significant difference in the body composition variables which is estimated by BIA, SCT and SLM. 3. In the SLIM LINE treatment during four month of obesity group, 7 site skinfold thickness was shown a statistically significant difference in abdomen(pre vs. after 4 mo, p<.05), suprailiac(pre vs. after 4 mo, p<.05), chest(pre vs. 4 mo, p<.05) and mid-axillary(pre vs. after 2 mo, 3mo and 4mo, p<.001, respectively). As this result, sum of 7 site skinfold thickness was significantly decreased(pre vs. 4 mo, p<.05). However, no significant difference in triceps, sub-scapular and thigh skinfold thickness. 4. In the SLIM LINE treatment during four month of non-obesity group, 7 site skinfold thickness was shown a statistically significant difference in abdomen(pre vs. after 4 mo, p<.01), and mid-axillary(pre vs. after 3mo and 4mo, p<.05, respectively). As this result, sum of 7 site skinfold thickness was significantly decreased(pre vs. after 3 mo and 4 mo, p<.01, respectively). However, no significant difference in suprailiac, chest, triceps, sub-scapular and thigh skinfold thickness. 5. In the SLIM LINE treatment during four month of obesity group, the changes of body composition by every 1 weeks interval was shown a significantly decreased levels in %body fat(pre vs. after 12wk, 13wk, 14wk, 15wk, and 16wk, p<.01, respectively) and fat mass(pre vs. after 13wk, 14wk, 15wk, and 16wk; after 1wk vs. 13wk, 14wk, 15wk and 16wk, p<.05, respectively). However, no significant difference in body weight and fat free mass. 6. In the SLIM LINE treatment during four month of non-obesity group, the changes of body composition by every 1 weeks interval was not shown statistically significant difference. As this results, It is suggest that regular SLIM LINE treatment is positive effect more obesity women than non-obesity women

명반석과 석회석의 혼합소성에서 Hauyne (3CaO · 3Al₂O₄ · CaSO₄) 생성 반응 특성 규명

김형석(Hyung Seok Kim),안용준(Yong Jun An),박주원(Joo Won Park),한춘(Choon Han) 한국암석학회 2009 한국암석학회 학술발표회 논문집 Vol.2009 No.5

주파수 체배기와 PLL을 이용한 10 ㎓ 생체 신호 레이더 시스템

명성식(Seong-Sik Myoung),안용준(Yong-Jun An),문준호(Jun-Ho Moon),장병준(Byung-Jun Jang),육종관(Jong-Gwan Yook) 한국전자파학회 2010 한국전자파학회논문지 Vol.21 No.2

본 논문에서는 주파수 체배기와 위상 동기화 회로(Phase-Locked Loop: PLL)를 이용한 주파수 합성기를 이용한 10 ㎓ 대역에서 동작하는 생체 신호 레이더를 제안하였다. 제안된 10 ㎓ 대역 생체 레이더는 2.5 ㎓ 전압 제어 발진기와 PLL을 이용하여 발생된 위상 잡음 특성이 매우 뛰어나고 안정적인 정현 신호를 이용하여 뛰어난 생체 신호 검출 성능을 보인다. 또한 10 ㎓ 대역에서 PLL을 구현하기 어려운 점을 해결하기 위하여 2.5 ㎓ 대역에서 PLL을 이용하여 발생된 신호를 주파수 체배기를 이용하여 10 ㎓ 대역 신호를 발생시키는 방법을 제안하였다. 본 논문에서는 제안된 구조의 생체 레이더의 잡음 특성을 이론적으로 분석하여 제안된 구조의 타당성을 검증하였다. 실험 결과 100 ㎝까지 매우 우수한 생체 신호 검출이 가능하였으며, 이로서 제안된 구조의 10 ㎓ 대역의 생체 레이더의 타당성을 확인하였다. This paper presents a novel 10 ㎓ bio-radar system based on a frequency multiplier and phase-locked loop(PLL) for non-contact measurement of heartbeat and respiration rates. In this paper, a 2.5 ㎓ voltage controlled oscillator (VCO) with PLL is employed to as a frequency synthesizer, and 10 ㎓ continuous wave(CW) signal is generated by using frequency multiplier from 2.5 ㎓ signal. This paper also presents the noise characteristic of the proposed system. As a result, a better performance and economical frequency synthesizer can be achieved with the proposed bio-radar system. The experimental results shows excellent bio-signal measurement up to 100 ㎝ without any additional digital signal processing(DSP), and the proposed system is validated.