Dy₂O₃-TiO₂ 산화물의 소결성 및 소결체 특성에 관한 연구

김한수,정창용,김시형,이병호,이영우,손동성,이상현,Kim, Han-Soo,Joung, Chang-Yong,Kim, Si-Hyung,Lee, Byoung-Ho,Lee, Young-Woo,Sohn, Dong-Seong,Lee, Sang-Hyun 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.11

산화물 제어봉 물질로서 $Dy_xTi_yO_z$ 소결체를 powder process에 의해 제조하였다. $Dy_2O_3+TiO_2$ 혼합분말의 소결성과 고용체의 상을 TMA와 XRD로써 각각 분석하였으며, 소결체의 비열과 열확산계수를 측정하여 열전도도를 구하였다. $Dy_xTi_yO_z$에서 Dy의 함량에 따라 소결성과 밀도가 변하였고 $3\;g\;Dy/cm^3\;Dy_xTi_yO_z$의 경우 $1580{\circ}C$의 소결온도에서 용융이 일어났다. $4.00\;g\;Dy/cm^3$ 소결체에는 $Dy_2TiO_5+Dy_2Ti_2O_7$의 두 상이 존재하며 $4.54\;g\;Dy/cm^3$의 경우 $Dy_2TiO_5$의 단일 상만이 존재하는 결과를 보였다. $Dy_xTi_yO_z$의 열전도도는 $25~600{\circ}C$ 범위에서 온도에 따라 큰 변화가 없으며 $1600{\circ}C$ 소결체가 1.69∼1.78 W/mK, 1550$^{\circ}C$ 소결체의 경우에는 1.49~1.55 W/mK이었다. .$Dy_xTi_yO_z$ pellets were fabricated as a reactor control material by the powder process. Sinterability of $Dy_2O_3+TiO_2$ mixtures and phases of solid solutions were analyzed by using TMA and XRD, respectively. The thermal conductivity of .$Dy_xTi_yO_z$ pellet was determined from the measurement data of the specific heat and the thermal diffusivity of the pellet. The sinterability and the sintered density varied as a function of Dy content in $Dy_xTi_yO_z$. The pellet of $3\;g\;Dy/cm^3\;Dy_xTi_yO_z$ melted in the sintering temperature of $1580{\circ}C$. There were two phases of $Dy_2TiO_5+Dy_2Ti_2O_7$ and a single phase of $Dy_2TiO_5$ for the pellet that has the Dy content of .$4.00\;g\;Dy/cm^3$ and .$4.54\;g\;Dy/cm^3$, respectively. The thermal conductivity of $Dy_xTi_yO_z$ was nearly constant in the temperature range of $25~600{\circ}$. It was 1.69~1.78 W/mK for the pellet sintered in .$1600{\circ}$ and 1.49~1.55 W/mK for the pellet sintered in $1550{\circ}$.

건설기업의 이익률 실태 및 특징 분석에 관한 연구

김한수,이현기,Kim, Han-Soo,Lee, Hyun-Ki 한국건설관리학회 2008 건설관리 : 한국건설관리학회 학회지 Vol.9 No.1

기업 존재의 목적은 정당한 이윤창출을 통해 지속적으로 성장 발전하는 것이다. 건설기업의 경우도 예외일 수 없다. 그러나 최근 정부의 강력한 부동산 대책이 분양가 상한제와 분양원가 공개로 이어지는 과정에서 건설기업의 '폭리(暴利)'에 대한 시민단체의 주장이 강하게 대두되어 왔다. 한 산업 또는 기업의 적정 이윤 또는 폭리 수준을 계량적인 수치로 정의한다는 것은 사실상 불가능하다. 본 연구의 목적은 국내 건설기업의 이윤 현황을 다양한 이익률 관점에서 조명하고 이를 타(他) 산업분야와 비교 분석하여 국내 건설기업의 이익률 실태와 특징을 도출하는데 있다. An objective of companies' existence is to make profits and grow steadily. Judging what is reasonable or excessive profit for an industry or a company by a profit figure is practically impossible because it is a matter of value judgement not just fact judgement. But recently construction companies' profit level is under severe argument. The objective of this study is to investigate the level of construction companies' profit level and compare it with other industries in order to identify facts and characteristics in relation to construction companies's profit level.

야생 돌복숭아(Prunus persica Batsch var. davidiana Max.) 추출액이 선천성 고혈압 흰쥐의 지질성분 및 혈압 저하에 미치는 영향

김한수,Kim, Han-Soo 한국생명과학회 2006 생명과학회지 Vol.16 No.7

야생 돌복숭아(Prunus persica Batsch var. davidiana Max.)의 생리활성 추출물질이 선천성 고혈압 흰쥐(SHR)의 지질대사 이상 및 고혈압 예방과 개선효과 등에 생리생화학적 효능이 있을 것으로 추정되어 Wistar 계 수컷 SHR을 사용하여, 기본식이와 물만을 급여한 대조군인 Control군과 SHR에 돌복숭아 5.0g% 추출액을 급여한 군(5g% Ex.군) 및 SHR에 돌복숭아 10.0g% 추출액을 섭취시킨 10g% Ex.군을 33일간 실험 사육하여 혈청 지질성분 및 혈압 저하 효과를 생리적 측면에서 검토하기 위하여 본 실험을 수행하였다. 혈청 중의 총 콜레스테롤 농도, 중성지방, LDL-콜레스테롤, 유리 콜레스테롤 및 동맥경화지수 등에서 돌복숭아 생리활성물질 5.0g%, 10.0g% 추출액을 섭취시킴으로서 유의적인 농도 등의 감소 효과를 보였으며, HDL-콜레스테롤 농도 및 총 콜레스테롤에 대한 HDL-콜레스테롤 비는 상승되는 것으로 나타났다. 한편, 간장 및 뇌 중의 총 콜레스테롤, 중성지방 농도는 돌복숭아 5.0g%, 10.0g% 추출액을 섭취시킨 군에서 감소되는 것으로 나타났다. 반면, 혈청 apolipoprotein(Apo) A-I, Apo A-II 농도 등은 돌복숭아 5.0g%, 10.0g% 추출액을 섭취시킨 군에서 유의적으로 증가되는 것으로 나타났다. 또한 Apo C-II, Apo C-III, Apo E 및 Apo A-I에 대한 Apo B의 농도 비는 감소되었으며, 혈압의 변화는 SHR에 돌복숭아 5.0g% 및 10.0g% 추출액을 섭취시킴으로서 혈압이 저하됨을 관찰할 수가 있었다. 돌복숭아 5.0g% 농도(5g% Ex.군)와 10.0g% 농도(10g% Ex.군)의 추출액 섭취에 따른 두 군간에 각종 지질성분과 apolipoprotein 분획 농도 및 혈압 변화의 비교는 유의적인 차이는 없었다 따라서 야생 돌복숭아 중의 생리활성물질 추출액 섭취가 선천성 고혈압 흰쥐에 대한 혈청 지질개선 및 심장순환기계 질환, 고혈압의 예방과 치료개선에 효과가 있을 것으로 생각된다. The purpose of this study was to observe the effects of the feeding physiological activity substance in feral peach(Prunus Persica Batsch var. davidiana Max.) extract intake on the improvement of the lipid compositions, apolipoprotein and blood pressure level in spontaneously hypertensive rats(SHR, Wistar strain, male) fed the experimental diets for 33 days. Concentrations of total cholesterol, triglyceride(TG), LDL-cholesterol, free cholesterol and atherosclerotic index in serum were significantly lower in the feral peach extract intake groups[groups 5g% Ex.(basal diet+feral peach 5.0g% extract), 10g% Ex.(basal diet+feral peach 10.0g% extract)] than those in the group Control(basal diet+water). In the ratio of HDL-cholesterol concentration to total cholesterol and HDL-cholesterol concentration, feral peach 5.0g%, 10.0g% extract intake groups(group 5g% Ex. and 10g% Ex.) were higher percentage than in the group Control. However, concentrations of total cholesterol and TC in liver and brain were significantly lower in the groups 5g% Ex. and 10g% Ex. than those in the group Control. But the concentrations of apolipoprotein (Apo) A-I and Apo A-II in serum were significantly higher in the feral peach 5.0g% and 10.0g% extract intake groups(5g% Ex. and 10g% Ex.) than in the control group. However, concentrations of Apo C-II, Apo C-III, Apo E and ratio of Apo B to Apo A-I in serum were fairly reduced in the groups 5g% Ex. and 10g% Ex. than in the control group. The levels of systolic and diastolic blood pressure were significantly lower in feral peach 5g% Ex. and 10g% Ex. groups than control group. However, no significance was found in the effect of among the groups(groups 5g% Ex. and 10g% Ex.). From these results, physiological activity substance in feral peach(Prunus persica Batsch var. davidiana Max.) extracts were effective on the improvement of the lipid compositions and cardiovascular heart disease, hypertension in spontaneously hypertensive rats. And particularly, feral peach extracts were more effective as a therapeutic regimen for the control of blood pressure in hypertension.

이종골 이식을 이용한 양성 골 종양 치료

김한수,Kim, Han-Soo 대한근골격종양학회 1995 대한골관절종양학회지 Vol.1 No.2

The authors reviewed 49 cases(48 patients) of benign bone tumor who had surgical treatment with xenograft at department of orthopedic surgery, Seoul National University Hospital from May, 1980 to May, 1994. Materials consist of 21 males and 27 females. The mean age at operation was 20.1 years(range : 4 -55 years) and the mean follow up period was 25.4 months(range : 7 - 85 months). We did xenograft only in 34 cases and xenograft mixed with autograft in 15 cases(14 cases, from ilium, 1 case from femur). The used materials for xenograft were $Lubboc^{(R)}$ in 29 cases, $Surgibone^{(R)}$ in 17 cases and $Pyrost^{(R)}$ in 3 cases. The average durations when bony union was achieved in radiograph were 13.8 weeks in whole cases, 12.5 weeks(range : 8 - 24 weeks) in $Lubboc^{(R)}$ graft cases and 15.7 weeks(range : 6 - 24 weeks) in $Surgibone^{(R)}$ graft cases. The tumor recurred in 4 cases, 1 case was recurred giant cell tumor at distal femur treated with mixed auto and $Lubboc^{(R)}$ graft and 2 cases were large cystic lesions at the proximal humerus diagnosed as simple bone cyst and at distal tibia diagnosed as fibrous dysplasia treated with $Surgibone^{(R)}$ graft and 1 case was aneurysmal bone cyst of the proximal tibia treated with $Lubboc^{(R)}$ graft. Wound infection occurred in 1 case. More transfusion was done in the cases that the lesion was larger than 5cm, the lesions were in the ilium or femur and the cases that were treated with mixed with autograft. This study implies that benign bone tumor is successfully treqated with curettage and xenograft or xenograft mixed with autograft. And also this method will reduce morbidity of donor site, intraoperative bleeding and post-transfusion complications. 저자들은 1980년 5월부터 1994년 5월까지 양성골 종양으로 서울대학교 병원 정형외과에서 수술적 치료를 시행한 49례를 분석하여 다음과 같은 결론을 얻었다. 1. 양성 골종양을, 소파술과 화학적 처리한 이종골 및 이종골과 자가 해면질골을 혼합 이식하여 만족한 결과를 얻었다. 2. 화학적 처리한 이종골 이식은 자가골 이식시보다 수술 시간, 수술중 출혈 및 수혈양을 줄여 수술 및 수혈 합병증을 감소시킨 것으로 사료된다. 3. 이종골 이식은 자가골 이식시 발생할 수 있는 문제를 염두에 둘 때 고려할 만한 골 이식 대치물로 사료된다.

액티베이터가 경추의 정렬에 미치는 영향에 관한 사례 연구

김한수,이재홍,권원안,Kim, Han-Soo,Lee, Jae-Hong,Kwon, Won-An 대한물리치료학회 2002 대한물리치료학회지 Vol.14 No.1

This study was performed to assess the efficacy of Activator for the patient with chronic neck pain. Mail, 26 years old, is treated with Activator, which was applied for 15 minutes every two days during the 4 weeks. The results of this study are as follows: 1. The treated case compared with the previous case showed that R.O.M particularly increased in flexion and extension. 2. The atlas/skull angle compared with the previous case showed that the angle increased from $0.8^{\circ}$ to $1.5^{\circ}$. In the atlas/skull, normal angle is $5.6^{\circ}$. 3. The angle of cervical curve lordosis compared with the previous case showed that the angle increased from $38.3^{\circ}$ to $48.1^{\circ}$. In the healthy spine, the angle is $42.0^{\circ}$. 4. The anterior curvature compared with the previous case showed that curve radii decreased from 7,220mm to 200mm. In the spine, normal curvature is 165mm. 5. Rush Jackson's angle compared with the previous case showed that the angle increased from $14.8^{\circ}$ to $29.1^{\circ}$. In the healthy spine, normal angle is $39.9^{\circ}$. We can not find significant level for Activator, but it is considered that activator method of chiropractic technique is effective.

단면의 형상에 따른 철근콘크리트 기둥의 폭발저항 성능 평가

김한수,박재표,Kim, Han-Soo,Park, Jae-Pyo 한국전산구조공학회 2010 전산구조공학 Vol.23 No.4

현재 연쇄붕괴를 방지하기 위한 설계 방법으로 기둥제거 시나리오를 이용한 대체하중경로법을 주로 적용하고 있다. 하지만 실제로 폭발이 발생하여 기둥이 완전히 제거되지 않는 경우에 기둥제거 시나리오를 적용하면 보수적인 결과를 얻게 된다. 본 논문에서는 단일 기둥이 폭발하중을 받을 때의 거동을 평가함으로써 폭발이후에도 기둥이 연쇄붕괴 방지에 기여할 수 있는지 여부를 판단하였다. 하이드로코드인 AUTODYN을 이용하였으며, 같은 단면적과 높이를 갖는 사각형 기둥과 원형 기둥의 폭발저항성능을 비교하였다. 우선 AUTODYN을 이용한 폭발하중 산정 결과를 폭발실험값과 비교한 다음 간단한 폭발 예제를 통해 계산된 폭발압력파가 실제와 유사함을 입증하였다. 단면 형상에 따른 기둥의 폭발저항 성능 해석을 수행한 후 잔류변형을 이용한 평가법을 이용해 원형기둥이 사각형 기둥보다 폭발저항 성능이 더 우수함을 확인하였다. The alternative load path method based on a column removal scenario has been commonly used to protect building structures from being progressively collapsed due to probable blast loading. However, this method yields highly conservative result when the columns still have substantial load resisting capacity after blast. In this study, the behavior of RC columns with rectangular and circular sections under the blast loading was investigated and the remaining capacity of the partially damaged columns was compared. AUTODYN which is a hydrocode for the analysis of the structure on the impact and blast loading was used for this study. The blast loading was verified with the experiment results. The analysis results showed that the circular columns are preferable to the rectangular ones in respect of the blast resistance performance.

단면의 형상에 따른 철근콘크리트 기둥의 폭발저항 성능 평가

김한수,박재표,Kim, Han-Soo,Park, Jae-Pyo 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.4

현재 연쇄붕괴를 방지하기 위한 설계 방법으로 기둥제거 시나리오를 이용한 대체하중경로법을 주로 적용하고 있다. 하지만 실제로 폭발이 발생하여 기둥이 완전히 제거되지 않는 경우에 기둥제거 시나리오를 적용하면 보수적인 결과를 얻게 된다. 본 논문에서는 단일 기둥이 폭발하중을 받을 때의 거동을 평가함으로써 폭발이후에도 기둥이 연쇄붕괴 방지에 기여할 수 있는지 여부를 판단하였다. 하이드로코드인 AUTODYN을 이용하였으며, 같은 단면적과 높이를 갖는 사각형 기둥과 원형 기둥의 폭발저항성능을 비교하였다. 우선 AUTODYN을 이용한 폭발하중 산정 결과를 폭발실험값과 비교한 다음 간단한 폭발 예제를 통해 계산된 폭발압력파가 실제와 유사함을 입증하였다. 단면 형상에 따른 기둥의 폭발저항 성능 해석을 수행한 후 잔류변형을 이용한 평가법을 이용해 원형기둥이 사각형 기둥보다 폭발저항 성능이 더 우수함을 확인하였다. The alternative load path method based on a column removal scenario has been commonly used to protect building structures from being progressively collapsed due to probable blast loading. However, this method yields highly conservative result when the columns still have substantial load resisting capacity after blast. In this study, the behavior of RC columns with rectangular and circular sections under the blast loading was investigated and the remaining capacity of the partially damaged columns was compared. AUTODYN which is a hydrocode for the analysis of the structure on the impact and blast loading was used for this study. The blast loading was verified with the experiment results. The analysis results showed that the circular columns are preferable to the rectangular ones in respect of the blast resistance performance.

몰로키아 분말을 첨가한 밀·보리 혼합 식빵의 제조 및 생리활성 평가

김한수,김영호,김애정,Kim, Han soo,Kim, Young Ho,Kim, Ae Jung 한국식품영양학회 2015 韓國食品營養學會誌 Vol.28 No.4

This study was performed to produce WBM (wheat and barley mixture) bread containing molokhia powder with quality characteristics and antioxidant activities. Analysis of the chromaticity of WBM prepared with molokhia powder showed that; the lightness and redness were decreased, but yellowness was increased. In mechanical properties, hardness, gumminess, and chewiness were significantly increased as the amount of molokhia powder was increased. However, cohesiveness was significantly decreased. In sensory evaluation, WBM bread containing 1.5% of molokhia powder (MB1.5) showed an overall high preference level. The total polyphenol content of molokhia powder EtOH extract and MB1.5 were 29.19 and 58.18 mg TAE/g, respectively. The total flavonoid contents of molokhia powder EtOH extract and MB1.5 were 20.62 mg and 33.25 mg RE/g, respectively. The radical scavenging ability ($IC_{50}$) of DPPH ($IC_{50}$) for molokhia powder EtOH extract and MB1.5 was 31.04 and $58.18{\mu}g/mL$, respectively while that of ABTS was 33.25 and $54.15{\mu}g/mL$, respectively. The ${\alpha}-glucosidase$ inhibitory effects of molokhia powder EtOH extract and MB1.5 were 494.88 and $814.88{\mu}g/mL$, respectively. MB bread containing 1.5% molokhia powder showed antioxidative effects and ${\alpha}-glucosidase$ inhibitory activity, meaning that not only molokhia but also MB1.5 bread has the potential to prevent chronic degenerative diseases such as diabetes.

전산해석을 이용한 CFT 기둥의 폭발저항성능 평가

김한수,박재표,Kim, Han-Soo,Park, Jae-Pyo 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3

In this paper, the blast resisting performance of the CFT columns was compared with that of the typical reinforced concrete columns and the reinforced concrete columns strengthened with steel jacket. AUTODYN which is a specialized hydrocode for the analysis of explosion and impact was used to simulate the structural behavior of the columns under the blast loading. The interaction between concrete and surrounding steel plates was modeled with two modeling methods, friction option and join option. The results from the frictional experiment were adopted to determine the friction coefficient in friction option. The CFT columns which have a similar P-M diagram with a reinforced concrete column were also investigated to compare the blast resisting performance and the static load resisting performance. According to the analysis results, the CFT column and the column with steel jacket showed much better blast resisting performance than the normal reinforced concrete column.

KTX 단기수요 예측을 위한 통행행태 분석

김한수,윤동희,이성덕,Kim, Han-Soo,Yun, Dong-Hee,Lee, Sung-Duk 한국통계학회 2012 Communications for statistical applications and me Vol.19 No.1

본연구는 KTX의 단기수요예측 방향을 설정하기 위한 통행행태 분석이 목적이다. 분석결과는 첫째, 이상치 판단기준은 통행량 표준편차의 2배가 적정한 것으로 판단된다. 둘째, ANOVA 분석을 이용하여 요일별 통행량의 동질여부를 분석한 결과 주중(월~목)과 주말(금~일)로 구분되었다. 셋째, 통행빈도, 통행량균, 통행거리를 이용하여 철도역간 O/D에 대해 군집분석을 시행하였다. This study analyzes the travel behavior for short-term demand forecasting model of KTX. This research suggests the following. First, the outlier criteria is considered to appropriate twice the standard deviation of the traffic. Second, the result of a homogeneity test using ANOVA analysis has been divided into weekdays(Mon Thu and weekends(Fri Sun). Third, a cluster analysis for O/D pairs using trip frequency, traffic averages and th distance between stations was performed.