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RISS 인기검색어
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- 저자 : 박란 ( Ran Park ) (검색결과 6 건)
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Vinyloligosilsesquioxane 함유 의치상용 아크릴릭 레진의 마모 저항성
박란,심준성,한동후,Park Ran,Shim June-Sung,Han Dong-Hoo 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.5
Statement of problem : Recently, in attempts to reinforce the acrylic resin and to reduce the polymerization shrinkage, it has been reported that adding vinyloligo-silsesquioxane (vinyl-POSS) to PMMA significantly compensates for polymerization shrinkage and somewhat increases the fracture resistance. Purpose : There haven't been any studies on abrasion that can affect the adaptation of the denture in long-term use. In this study abrasion resistance was compared between acrylic resin with vinyl-POSS and commercialized acrylic resin for denture base. In addition, the difference in abrasion resistance according to molding methods was compared. Material and method : Using PaladentR 20 including vinyl-POSS. PaladentR 20, Lucitone 199R, SR IvocapR, denture bases were fabricated using compression molding technique and continuous-pressure injection technique. Surface hardness and abrasion were measured for each group, and the worn surfaces were observed under a scanning electron microscope. Results : 1. When surface hardness was measured for each material and molding technique, there was no statistically significant difference among the materials. (p<0.05) 2. When same denture base material and molding technique were used, the abrasion due to toothpaste solution was 5 times as severe as the abrasion due to soap solution. 3, When toothpaste solution was used, the abrasion decreased in the order of PaladentR20, PaladentR 20 including vinyl-POSS, SR IvocapR, and Lucitone 199R. However statistically significant difference was seen only among PaladentR 20, SR IvocapR, and Lucitone 199R. (p<0.05). 4. When soap solution was used, the abrasion was more severe in PaladentR 20 and including vinyl-POSS PaladentR 20 groups than in SR IvocapR and Lucitone 199R groups. (p<0.05). Conclusion : Addition of vinyl-POSS doesn't improve the abrasion resistance, and the abrasion resistance was similar to those of existing materials. Additional studies under different conditions are needed. For clinical application of vinyl-POSS, further investigations with different requirements and conditions are necessary.
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AOMDV에서 이동성 정보를 활용한 안정적 라우팅 기법
박란(Ran Park),김우완(Wu-Woan Kim) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.1
In MANET, the nodes, configuring a path, act as routers and they have various mobilities. If the path is broken by a nodes moving, a new path has to be found again. For this reason, the node with high mobility should be excluded from configuring a path as far as possible. In this paper, we propose an algorithm which excludes nodes with high mobility from constructing a path by collecting and managing the information of mobility. As the result, the proposed algorithm provides more stable paths. In this algorithm, we append MRecord Field and Relieve Field in the routing table to collect and manage the mobility information by extending current AOMDV. In addition, we add Mbl Field to RREP (Route Reply) message to adapt the collected information to configure the real path.
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박란,이성기,송영일 조선대학교 환경연구소 1999 環境硏究 Vol.15 No.1
The purpose of this study was water quality of water treatment plants and distribution and service pipes examine and comparison, remain effect of disinfectant examine, used quality mark out prediction technique according to the distance apart from water treatment plants as intend to contributed water management. 1. The Langelier Saturation Index which is used to measure corrosion is influenced by the pH of the water, pH is at 6.3∼7.3 at the terminal place and in summer there is minimal pipe line corrosion in K city. 2. The shorter the distance from the water treatment plant to the tap the free chlorine residual concentration is only slightly deminished, but as the as the distance from source to tap increases the free chlorine residual concentration in the water decreases. Free chlorine residual change the 1st reaction, the 1st reaction was C=0.70e^-0.105L. 3. The equation of 1st reaction law for color was C=1.636e^0.008L, 1st reaction law for turbidity was C=0.57e^0.050L. 4. The optimum distance for free chlorine residual concentration of 0.2㎎/L is about 15∼16㎞ from water treatment plant(or distribution reservoir). Therefore, when the terminal place is 20∼25㎞ the injection of free chlorine residual as the concentration of 0.3∼0.5 ㎎/L from water treatment plants(or distribution reservoir). The high free chlorine residual concentration avoid inject, in result pipe line corrosion and THM's was potential of dissolved.
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박란,이성기,송영일 조선대학교 환경공해연구소 1999 環境公害硏究 Vol.15 No.-
The purpose of this study was water quality of water treatment plants and distribution and service pipes examine and comparison, remain effect of disinfectant examine, used quality mark out prediction technique according to the distance apart from water treatment plants as intend to contributed water management. 1. The Langelier Saturation Index which is used to measure corrosion is influenced by the pH of the water. pH is at 6.3∼7.3 at the terminal place and in summer there is minimal pipe line corrosion in K city. 2. The shorter the distance from the water treatment plant to the tap the free chlorine residual concentration is only slightly deminished, but as the as the distance from source to tap increases the free chlorine residual concentration in the water decreases. Free chlorine residual change the 1st reaction, the 1st reaction was C = 0.70e (-0.105L). 3. The equation of 1st reaction law for color was C= 1.636e (0.008L), 1st reaction law for turbidity was C = 0.57e (0.050L). 4. The optimum distance for free chlorine residual concentration of 0.2 ㎎/L is about 15∼16km from water treatment p1ant(or distribution reservoir). Therefore, when the terminal place is 20∼25km the injection of free chlorine residual as the concentration of 0.3∼0.5 ㎎/L from water treatment plants(or distribution reservoir). The high free chlorine residual concentration avoid inject, in result pipe line corrosion and THM's was potential of dissolved.
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