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클러스터형 VOD서버에서 고가용성을 고려한 자체 복구 시스템
이좌형,서동만,방철석,김병길,정인범 강원대학교 정보통신연구소 2004 정보통신논문지 Vol.8 No.-
While clustered VOD (Video On Demand) servers that have been proposed for building large-scale VOD system recently, have the advantages of high availability and scalability, the system level reliability of the clustered VOD servers could be decreased by adding more servers to scale up the capacity of the server. To alleviate this reliability problem and support server-level fault tolerance, this paper proposes and analyzes self recovery system based on RAID-3 and 4 with pipelining concept. The proposed self recovery system could increase the efficiency of the disk by accessing the disk with large size block as in RAID-4. The network resource could be used efficiently and the workload of memory could be decreased by sending data in small size block as in RAID-3. By introducing pipeline concept, the recovery tasks are processed at several nodes in parallel so that the workload in CPU, network, and memory could be distributed to several nodes.
화목피 추출물이 Streptozotocin 으로 유발시킨 흰쥐의 당뇨와 Free Radical 에 미치는 효과
임병우,서태원,신흥묵,박동기,김선여,조금호,김호철 대한본초학회 2000 大韓本草學會誌 Vol.15 No.2
Type I diabetes is caused by destruction of the pancreatic beta cells responsible for insulin-secretion. It can be induced by the drugs alloxan or streptozotocin (STZ). Both an increase in reaction oxygen free radical species and a decrease in the antioxidant defense mechanism lead to the increase in oxidative stress in diabetes mellitus. Oxygen radicals scavengers are effective in preventing diagetes in animal models. Experiments were conducted by two system. The Sprague-Dawley rats were treated with STZ intravenous injection after oral administrated Betula's extract and quercetin for a week, and were administrated them for a week. In vitro, Betula's extracts and quercetin showed a tendency towards inhibition of free radical oxidation in all. In vivo, Betula's extracts group exhibited suppression morphologic change in pancreatic islet compare quercetin group on light microscopy. The Betula's extract significantly inhibited formation of MDA compared to the STZ-induced diabetic group in pancreas.They also significantly inhibited formation of Phosphatidylcholine hydroperoxide(PCOOH) compared to the STZ-induced diabetic group in pancreas and plasma, which considered defense against destruction in beta cells. The protection by Betula's extracts may be due to scavenging of deleterious and highly reactive free radical which is generated by STZ. In streptozotocin-induced diabetic rats, the effect of Betula's extract are greater than that of quercetin. Based on this result, we concluded that Betula's extract has the ability to effectively suppress in vitro and in vivo oxidation, thereby providing additional evidence for their potential beneficial type I diabetes.
비가림 및 망사 시설재배가 참다래의 수체생육 및 과실품질에 미치는 영향
나양기,마경철,임동근,김병삼,임경호,김월수,이상현,박용서 全南大學校 農業科學技術硏究所 2001 農業科學技術硏究 Vol.36 No.-
This studies were conducted to investigate the effects of rain shelter and netting on the tree growth, fruit set fruit quality of kiwifruit (Actinidia deliciosa). In rain shelter and net house, shoot falling wasn't occurred by strong wind, and fruit set, fruit weight and also fruit malformation, side flowering increased at the same time. In rain shelter house the increment temperature forced blooming date and increased shoot length, leaf number and diameter but in net house these tendencies were not observed. Relative light intensity of rain shelter house was higher than that of net house with standard of field culture (relative light intensity: 100%). Soluble solid content was higher in rain shelter house, and acid content was higher in net house. With the effect of rain sheltering the occurrence of bacterial bloom rot and canker significantly decreased in both rain shelter and net house but insect injury increased. These data showed that rain shelter house is more suitable for kiwi fruit culture.
칼슘제 수관살포가 참다래의 과실 품질과 저장에 미치는 영향
임경호,나양기,임동근,마경철,조윤섭,김월수,이상현,박용서 全南大學校 農業科學技術硏究所 2001 農業科學技術硏究 Vol.36 No.-
This study were carried out to improve Kiwifruit quality and storage life. Three kinds of calcium compound were sprayed and calcium content of fruits, weight loss during fruit storage and fruit quality were investigated. Calcium contents within leaves and fruit were lower in Clef-non treatment than that of control. The calcium content in fruit pericarp of Kalk-H and CaCl2 was 0.04 to 0.05% higher than that of control. Fruit weight and soluble solids content at harvest was a little higher but acidity and fruit hardness was lowered. Fruit weight loss of Kalk-H and CaCl2 treatment was 1.39 to 1.53% lower than that of control during storage. The soluble solids of ripen fruit was 1.0 to 1.3% higher in all treatment and 0.8% higher in Kalk-H treatment in 120 of after storage. Fruit hardness of control fruit was higher at harvest but that of CaCl2 treatmented fruit was 0.39㎏/φ 5㎜ higher in 120 days of storage.
질소 및 인 함유 폐양액 처리를 위한 최적 인공습지 시스템 선정
박종환(Jong-Hwan Park),서동철(Dong-Cheol Seo),서동철(Dong-Cheol Seo),서동철(Dong-Cheol Seo),최정호(Jeong-Ho Choi),김홍출(Hong-Chul Kim),이상원(Sang-Won Lee),하영래(Yeong Rae Ha),조주식(Ju-Sik Cho),허종수(Jong-Soo Heo) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.5
질소 및 인 함유 폐양액 처리를 위한 최적 인공습지 시스템을 선정하기 위해 처리조의 연결방식을 달리하여 최적 system을 선정하였고, 선정된 최적조건하에서 폐양액 부하량에 대한 적응성을 평가하였다. 현장 폐양액처리장에서 시스템별 정화효율을 평가한 결과 system A의 BOD, COD, SS, T-N 및 T-P의 처리효율은 각각 88, 77, 94, 54 및 94%로서 다른 시스템에 비해 가장 높은 정화효율을 보였다. 현장 폐양액처리장에서 폐양액 부하량별 수처리 효율을 조사한 결과 system A의 BOD, COD, SS, T-N 및 T-P의 처리효율은 폐양액 부하량에 따라 별 차이 없이 각각 87-89, 76-79, 93-94, 52-55 및 91-94%로 전반적으로 높고 안정적으로 처리되었다. 하지만 T-N의 처리효율은 55% 정도 수준으로 폐수배출기준을 안정적으로 만족하기 위해서는 질소 처리효율을 좀 더 향상시킬 필요가 있을 것으로 판단된다. In order to develop constructed wetlands for treating hydroponic wastewater in greenhouse, actual constructed wetlands were used the obtained optimum condition in previous study, and the removal rate of pollutant in the water according to 4 kinds connection method of piping such as system A (UP-UP stream), system B (UP-DOWN system), system C (DOWN-UP stream) and system D (DOWN-DOWN stream) were investigated. Removal rate of biochemical oxygen demand (BOD), chemical oxygen demand (COD), suspended solids (SS), total nitrogen (T-N) and total phosphorus (T-P) by system A (UP-UP stream) connection method in actual constructed wetlands were slightly higher than other systems. At the system A, the removal rate of BOD, COD, SS, T-N and T-P were 88, 77, 94, 54 and 94%, respectively. Under different hydroponic wastewater loading, the removal rates of pollutants were higher in the order of 75 L m<SUP>-2</SUP> day<SUP>-1</SUP> ≒ 150 L m<SUP>-2</SUP> day<SUP>-1</SUP> ?300 L m<SUP>-2</SUP> day<SUP>-1</SUP>. Therefore, optimum connection method was system A for treating hydroponic wastewater in greenhouse.
A Fusion Positioning System of Long Baseline and Pressure Sensor for Ship and Harbor Inspection ROV
Seo, Dong-Cheol,Lee, Yong-Hee,Jo, Gyung-Nam,Choi, Hang-Shoon The Society of Naval Architects of Korea 2007 Journal of ship and ocean technology Vol.11 No.1
The maintenance of a ship is essential for safe navigation and hence regular surveys are prescribed according to the rule of classification societies. A hull inspection is generally performed by professional divers, but it takes a long time and the efficiency is low in terms of time and cost. In this research, a ROV(Remotely Operated Vehicle) named as SNU-ROV(Seoul National University-ROV) is developed to replace the conventional inspection method. In this system, the ROV is intended to be used for inspecting ship and harbor because harbor inspection is merging as a safety measure against any possible terror actions. In order to increase the efficiency of inspection, the ROV must be able to measure the exact position of damages. SNU-ROV has a positioning system based on LBL(Long Base Line). In shallow water such as harbor, however, LBL has bad DOP(Dilution of Precision) in the depth direction due to the limited depth. Thus LBL only can not locate the exact depth position. To solve the DOP problem, a pressure sensor is introduced to LBL and a complementary filter is attached by using indirect feedback Kalman filter. Thus developed positioning system is verified by simulation and experiment in towing tank.
Determination of Initial Denitrification in Intact Cores under Various Freshwater Wetland Types
Seo, Dong-Cheol,Delaune, R.D.,Lane, Robert R.,Day, John W. Korean Society of Soil Science and Fertilizer 2012 한국토양비료학회지 Vol.45 No.1
Denitrification rate was determined for various freshwater wetland types in the Mississippi River Coastal delta plain. Site 1 and 4 were collected from forested-tupelo dominated wetland, and site 2 and 3 were from floating emergent marsh. The maximum $N_2O$ emission was $7.47mg\;N\;m^{-2}$ for site 1 at day 6 after the addition of nitrate, $6.96mg\;N\;m^{-2}$ for site 2 at day 4, $6.63mg\;N\;m^{-2}$ for site 3 at day 3, and $9.64mg\;N\;m^{-2}$ for site 4 at day 4. The denitrification rate was determined using the acetylene inhibition method $1.24mg\;N\;m^{-2}d^{-1}$ for site 1, $1.93mg\;N\;m^{-2}d^{-1}$ for site 2, $2.24mg\;N\;m^{-2}d^{-1}$ for site 3, and $2.78mg\;N\;m^{-2}d^{-1}$ for site 4. The maximum denitrification rate was in the order of site 4 > site 3 > site 2 > site 1.