• 한국지역사회생활과학회지
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• 제14권2호
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• pp.63-70
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• 2003

In this experiment, the curd was made from soybean and cow's milk in the ratio of 7 to 3, and coagulated with Glucono-delta-lacton(GDL) and $CaSO_4&.$2H_{2}O& in the 1:1 ratio. During the procedure, the mulberry leaf powder was added. The amount of the added powder varied from 0.1 % to 0.5 %. This experiment aimed to show the change of yield, general components, minerals, amino acid, changes of pH, sensory properties of these products. As mulberry leaf powder addition increased, crude protein, crude fat, crude ash content, minerals and amino acids increased. Whereas moisture content decreased, and in particular,$Ca^{++}$, $K^+$ and $Na^+$ increased. On the other hand, in the sensory properties, the levels of satisfaction about the color, appearance, flavor, texture and savory were lower in mulberry leaf powder added than under control.

• 한국가금학회지
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• 제32권1호
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• pp.61-66
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• 2005

본 실험은 성게 껍질 분말의 사료적 가치를 구명하기 위하여 첨가수준(0, 1, 3, $5\%$)에 따라 육계의 생산성, 계육의 무기물 및 혈중 콜레스테롤 등에 미치는 영향을 고찰하기 위하여 5주간 사양 시험하였다. 전기 3주간사료내 조단백질은 $21.5\%$, ME는 3,100 kcal/kg 수준으로 공급하였고, 후기에는 조단백질 $19\%$, ME 3,100 kcal/kg 수준으로 급여하였다. 처리구는 대조구(무첨가구) 성게 껍질 분말 $1\%$ 첨가구(T1), $3\%$첨가구(T2), $5\%$ 첨가구(T3)로 처리구당 4반복, 반복당 10수로 총 160수를 공시하였다. 그 결과 증체량은 T1구에서 사육전기에 현저하게 개선되었지만(P<0.05) 사육후기에는 가장 낮게 평가되었으며, 사료효율은 처리구 사이에 유의성이 인정되지 않았다(P>0.05). 총콜레스테롤은 대조구보다 성게 껍질 분말 처리구에서 낮게 나타났으며, HDL-C은 처리구 중T2, T3에서 높았고(P<0.05), LDL-C과 triglyceride는 유의성이 인정되지 않았다. 성게 껍질 분말 급여 수준에 따른 무기물의 변화는 대조구에 비해 처리구에서 Fe, Zn, Ca함량이 많았으며(P<0.05) 총무기물 함량은 성게 껍질 분말 급여구에서 많은 경향을 보여 주었다. 결론적으로 육계사료 내 성게 껍질 분말의 급여는 Ca, Fe 및 총무기물 함량이 증가된 계육을 생산할 수 있을 것으로 사료된다.

• 한국식품과학회지
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• 제32권2호
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• pp.265-270
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• 2000

국내에서 살균, 살충의 목적으로 7kGy의 감마선이 허가된 백삼분말을 대상으로 $0{\sim}15\;kGy$의 전자선을 조사하고 screening을 목적으로 한 PSL측정과 신뢰성이 높은 것으로 여겨지는 TL 측정에 의해 방사선 조사여부를 확인하였다. PSL을 측정한 결과 비조사구는 threshold value$(T_1)$인 700보다 낮은 값을 나타내면서 negative로 표시되어 방사선 조사되지 않은 것으로, 2.5kGy이상 조사구는 threshold value $(T_2)$인 5000보다 높은 값을 나타내면서 positive로 표시되어 방사선 조사된 것으로 확인되었다. Density separation 추출법을 이용하여 시료로부터 mineral을 분리하여 TL 측정을 실시함으로써 glow curve가 나타나는 온도범위와 glow curve의 형태를 확인하고 TL ratio를 구한 결과, 방사선 조사되지 않은 시료는 $300^{\circ}C$ 부근에서 glow curve가 나타났고 이들의 intensity 또한 낮게 나타났다. 그러나 방사선 조사구는 $200^{\circ}C$ 부근에서 아주 강한 intensity의 glow curve를 보여주었다. 또한, normalization에 의한 TL ratio는 비조사구에서 0.01, 조사구에서 0.78 이상을 나타내어 방사선 조사여부 확인이 가능하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 봄학술 발표회 논문집(II)
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• pp.193-196
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• 2005

In this study, the purpose is to suggest the data on mixing ratio which effects on the carbonation of concrete by replacing various admixture such as silica fume, fly ash, slag powder. Thus, we have experimented the accelerated test on the carbonation related to hardened body of the concrete which was admixed by slag powder, silica fume, fly ash and it was cured for 4 weeks in carbonation accelerator after 28 days curing water. The result of this experiment showed that carbonation speed increased highly when admixtures be used to replacing by growing of admixture ratio. especially, the test sample which was replaced with silica fume 15$\%$ and slag powder 40$\%$, was promoted highly to carbonation.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.875-876
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• 2006

For dry machining of mineral materials the Institute of Materials Engineering pursues a novel thermal protection shield concept for diamond tools, in which thermal insulating materials in diamond composite structures act as heat shield, which protects diamonds in deeper layers against high temperature and graphitisation. Before the effectiveness of this concept could be investigated suitable composites have to be manufactured. In this paper the powder metallurgical production processes of diamond-alumina-cobalt-composites with varying alumina and cobalt particle sizes, their microstructures and porosities are described. It could be observed that the distribution of small-sized alumina particles ($<70{\mu}m$) in the cobalt matrix is uniform and the porosity of the composite decrease.

• 대한소아치과학회지
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• 제28권4호
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• pp.700-708
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• 2001

소아환자에 있어 외상성 손상은 미완성된 치근의 발육을 방해할 수 있다. 미완성된 치아의치수가 괴사된 경우 근관은 완전히 세척되어져야 한다. 그러나 apical stop이 부족하고 얇고 부서지기 쉬운 치수벽 때문에 적절한 apical seal을 얻기 위해서는 치근단 형성술을 시행해야 한다. 지금까지 수산화 칼슘이 치근단 형성술의 선택약제가 되어왔다. 그러나, 수산화칼슘을 이용한 치근단 형성술은 치료시기가 다양하고, apical closure도 불확실하며, 환자 follow up이 어렵고, 치료가 늦어지는 한계가 있다. 이에 인공적인 apical barrier를 형성시켜 근관의 즉각적인 충전을 할 수 있는 MTA(Mineral Trioxide Aggregate, DENTSPLY Tulsa Dental, U.S.A)를 이용하였다. MTA는 tricalcium silicate, tricalcium aluminate, tricalcium oxide와 silicate oxide와 같은 친수성 입자로 구성된다. 또한 소량의 mineral oxide와 bismuth oxide powder를 포함한다. MTA는 경화후 pH가 수산화칼슘 또는 $Ca(OH)_2$와 유사한 12.5로 항균작용을 지닌다. 용해도가 낮고, 상아질보다 약간 더 큰 방사선 불투과성을 보인다. 또한 다른 재료들보다 미세누출이 상당히 적고 다른 재료들보다 경조직 형성 능력이 뛰어나다. 본 증례는 전북대학교 소아치과에 외상으로 인해 치근단이 미완성된 미성숙 영구치의 치근단 형성술을 위해 내원한 환아에 대해 MTA를 적용하여 양호한 결과를 얻었기에 이에 보고하는 바이다.

• Preventive Nutrition and Food Science
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• 제15권1호
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• pp.78-82
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• 2010

This study investigated the effects of water-soluble calcium supplements manufactured with eggshells and oyster shells on growing rats. The aim was to review the potential use of food wastes as materials for water-soluble calcium supplements as compared to water-soluble calcium supplements made from imported seaweed powder. When experimental animals were administered three types of water-soluble calcium supplements orally for six weeks, the serum calcium level of the seaweed calcium supplement group were significantly higher than that of eggshell or oyster shell-derived calcium, but blood alkali phosphatase activity, osteocalcin and urine crosslink levels were not different in the three types of calcium supplements. Bone mineral density and bone mineral content in spine, femur and tibia also were not significantly different among the groups. However, when considering body weight of each group, bone mineral density and bone mineral content of the femur were significantly higher in the oyster shell calcium supplement group. These results suggest that at least on a short-term basis, the effect of calcium supplements prepared from eggshell and oyster shell are similar to the effects of seaweed calcium supplements.

• 한국재료학회지
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• 제15권2호
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• pp.79-84
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• 2005

The lowest activation temperature of a commercial vacuum getter reported so far in literature was about $400^{\circ}C$. Recently, $Ti_{0.3}Zr_{0.2}V_{0.5}$ alloy has been reported to exhibit the activation temperature lower than $200^{\circ}C$ when they are prepared as thin film. In this study, the alloy was prepared as bulk form and its activation temperature and hydrogen sorption properties were investigated in compliance with a standard method. The alloy powder was prepared by arc melting and subsequent HDH(Hydride-DeHydride) process. The activation temperature of the alloy was estimated from the ultimate pressure-temperature curve and located between $150^{\circ}C\;and\;200^{\circ}C$. The hydrogen sorption speed measured by an orifice method was 0.895 liter/sec which is comparable to thin film of same composition.

• 대한금속재료학회지
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• 제48권11호
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• pp.989-994
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• 2010

A nanopowder of TiAl was synthesized by high energy ball milling. Dense nanostuctured TiAl was consolidated using a high frequency induction heated sintering method within 2 minutes from mechanically synthesized powders of TiAl and horizontally milled powders of Ti+Al. Properties of the TiAl obtained using the two methods were compared. The grain size and hardness of TiAl sintered from horizontally milled Ti+Al powders and high energy ball milled TiAl powder were 40 nm, 20 nm, and $630kg/mm^2$, $700kg/mm^2$, respectively.

• 대한금속재료학회지
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• 제48권10호
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• pp.922-928
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• 2010

Nanopowder of TiCu was synthesized by high-energy ball milling. A dense nanostructured TiCu was consolidated using a pulsed-current activated sintering method within 1 minute from mechanically synthesized powders of TiCu and horizontally milled powders of Ti+Cu. The grain size and hardness of the TiCu sintered from horizontally milled Ti+Cu powders and high-energy ball-milled TiCu powder were 68 nm, 27 nm and $490kg/mm^2$, $600kg/mm^2$, respectively.