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급만성 바이러스성 간염에서 간염 B 바이러스 표식자에 따른 뇨검사 이상의 상관관계에 관한 연구
이상재,손덕재,유석희,허성호,신순현,박애자 대한신장학회 1984 Kidney Research and Clinical Practice Vol.3 No.2
The prevalence rate of hepatitis B infection is very high in Korea. Recently hepatitis B infection has be n incriminated in the pathogenesi of im- mune complex diseases, especially glomerular lesion. To evaluate these association, we tdied correl- ation between urinary abnormalitie; and HB mar- kers in acute and chronic viral hepatitis. Serum HB markers (HB Ag, Ant.HB, Anti HBc, HBeAg, AntiHBe) and urinalysis were tested in 261 patients with acute and chronic viral hepatitis, who were admitted to our hospital from Oct. 81 to Jun. 84. And 400 controls with all negative HB markers were also tested urinalysis. The results were as follows: 1) Urinary abnormalities were si-significantly high in acute viral hepatitis than controls (P$lt;0.001). But there were no significant differences between HB markers. It was suggested that these findings were due to acute serum sickness like phenomenon. 2) Urinary abnormalities were significantly high in chronic viral hepatitis than controls(P$lt;0. 001). There was statistical significance between HBsAg positive group and HBsAg negative group(P$lt;0.05), but not another groups(P$gt;0. 05). 3) To find out any relationship hetween urinary abnormalities and HB markers, wet ied statistical analysis to all combination. But only one combin- ation, HBsAg and AntiHBc in chronic viral hepatitis was statistically signiii- nt(P$lt;0.05), It is concluded that HB markers may be a role in the pathogenesis of renal disease, but further sophisticated prospective studies are needed.
이상재,배효준,서영백,박흥식,전태옥,Lee, Sang-Jae,Bae, Hyo-Jun,Seo, Young-Baek,Park, Heung-Sik,Jun, Tae-Ok 한국기계가공학회 2003 한국기계가공학회지 Vol.2 No.3
The End-milling has been widely used in the industrial world because it is effective to cutting working with various shape. Recently the end-milling is demanded the high-precise technique with good surface roughness and rapid manufacturing time for precision machine and electronic elements. The cutting working of end-milling such as, cutting direction, revolution of spindle, feed rate and depth of cut have an effect on optimum surface roughness. This study was carried out to decide the working condition for optimum surface roughness and rapid manufacturing time by design of experiment and ANOVA. From the results of this study, the optimum working condition for end milling is upward cutting in cutting direction, 600rpm in revolution of spindle, 240mm/mm in feed rate, 2mm in axial depth of cut and 0 25mm in radial depth of cut. The design of experiment has become an useful method to select optimum working condition mend-milling.
석탄회를 재활용한 '셀카시'의 토양 개량과 골프 코스 잔디 생육에 대한 효과
이상재,허근영,정운익 한국잔디학회 1999 한국잔디학회지 Vol.13 No.4
The objective of this study was to improve the recycling rate of coal ash fly, industrial waste. This study was conducted to analyze the physico-chemical properties of \"CellCaSi\" and clarify the effects on the growth of Kentucky bluegrass(Poa pratensis L.) and creeping bentgrass(Agrostis paulstris Huds \"Penncross\") and the chemical properties of soil, which was cellular calcium silicate reproduced by coal ash fly. A field assay was carried out in Young-Pyong Golf Course. The results were as follows. 1. The main chemical composition of CellCaSi was $SiO_2$(45~55%) and CaO(25~35), which was 70~90% of total weight. CellCaSi showed pH 8~9. Bulk density of CellCaSi was 0.35~0.45g/㎤. Water content of CellCaSi was 52.5~67.5%. 2. In the applied plots, leaf width, grass density per $1\textrm{cm}^2$, rhizome number and length per plant, and root number per plant of Kentucky bluegrass(Poa pratensis L.) and creeping bentgrass(Agrostis paulstris Huds \"Penncross\") showed increasing tendency compared with the control. The application of CellCaSi increased the growth of turfgrasses. Their visual quality on hardness, grass shoot density per $1\textrm{cm}^2$ and root growth was very good. And, their visual quality on rhizome growth was good. 3. After the application of CellCaSi, pH, CEC, Ex-cation of the applied soil showed increasing tendency with the little range, $SiO_2$content increasing tendency considerably, and organic matter content decreasing tendency compared with the control.ncy compared with the control.
Ensemble-Based Methodology to Identify Optimal Personal Mobility Service Areas Using Public Data
이상재,손승오,박준영,박재홍 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.7
Public transportation networks are well established in main cities, but there are some inconveniences in using public transportation in some cities. Public transportation is less accessible and walking distance of getting to public transportation is too long in some cities. Compared to other cities, Seoul has a higher satisfaction rate with public transportation. There are many cases, however, where short-distance taxis are used because walking to destinations after using public transportation is inconvenient; instead, Personal mobility (PM) devices can be used for these short-distances trip. This study aims to find the optimal PM service area using GIS (Geographic Information System)-based public transportation big data analyses. Variables were generated by collecting socio-economic factors, public transportation data, and geographic data and Extreme gradient boosting and Random forest, which are representative ensemble methods, were used for evaluation. We divided Seoul into a hexagonal grid and developed the optimal PM location service model by creating hexagonal cell data units and analyzing the areas with the models. We found that residential complexes, parks, and near subway stations (all areas with high foot traffic) are best suited for optimal placement. We also determined deployment should be in lower sloped areas. We expect this work to help determine public transportation stop and shared mobility station locations as well as contribute to public transportation demand surveys and accessibility analyses.