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Concurrency Control Method to Provide Transactional Processing for Cloud Data Management System
Dojin Choi,Seokil Song 한국콘텐츠학회 2016 International Journal of Contents Vol.12 No.1
As new applications of cloud data management system (CDMS) such as online games, cooperation edit, social network, and so on, are increasing, transaction processing capabilities for CDMS are required. Several transaction processing methods for cloud data management system (CDMS) have been proposed. However, existing transaction processing methods have some problems. Some of them provide limited transaction processing capabilities. Some of them are hard to be integrated with existing CDMSs. In this paper, we proposed a new concurrency control method to support transaction processing capability for CDMS to solve these problems. The proposed method was designed and implemented based on Spark, an in-memory distributed processing framework. It uses RDD (Resilient Distributed Dataset) model to provide fault tolerant to data in the main memory. In our proposed method, database stored in CDMS is loaded to main memory managed by Spark. The loaded data set is then transformed to RDD. In addition, we proposed a multi-version concurrency control method through immutable characteristics of RDD. Finally, we performed experiments to show the feasibility of the proposed method.
Incidence of Fusarium and Other Molds in Korean Field Crops
Dojin Ryu,Lloyd B. Bullerman 한국식품영양과학회 1998 Preventive Nutrition and Food Science Vol.3 No.1
The incidence of total molds, Fusarium species, and the estrogenic mycotoxin, zearalenone, in Korean grain samples were investigated. The majority of molds infecting grain were identified as belonging to the genus Alternaria, with an average infection rate of kernels of 43% and 32% in rice and barley, respectively. Fusarium species were less common, with average infection rates of 13% and 19% in rice and barley, respectively. A number of field fungi including Curvularia and Dactylaria were also observed. Among the Fusarium species, 71 of 94 Fusarium isolates were identified as F. semitectum. A few F. moniliforme and F. equiseti were observed from both rice, barley, and beans. Zearalenone was not detected in any of the 29 samples either by enzyme-linked immunosorbent assay(ELlSA) or high-performance liquid chromatography(HPLC). In addition, deoxynivalenol was not detected by ELISA. However, the presence of molds, including Fusarium species, may pose possible health hazards to persons consuming those grains.