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조영일,김경아,진윤미,박윤정,김한수,박윤신 한국조직공학과 재생의학회 2017 조직공학과 재생의학 Vol.14 No.4
Differentiation of mesenchymal stem cells (MSC) into a variety of cell lineages such as adipocytes, osteocytes, and chondrocytes is often accompanied up-regulation of autophagy. In our study, we demonstrated that the expression of autophagy-associated proteins (p-Beclin 1, LC3A, LC3B, p-AMPK, p-mTOR and ATG3, ATG7, and ATG12-5) over a period of time was hardly distinguishable from control tonsil-derived MSC (TMSC). Despite the unnoticeable difference in autophagy activation between differentiated TMSC (dTMSC) and the control (cTMSC), we reported significant changes in intracellular compositions in differentiated TMSC into functional parathyroid-like cells secreting parathyroid hormone (PTH). By using transmission electron microscopy (TEM), we observed accumulation of multivesicular bodies (MVB) comprising small, degraded compartments densely accumulated as dark granular or amorphous clumps, multilamellar bodies and lipid droplets in dTMSC. However, no such structures were found in cTMSC. These results suggest that differentiation of TMSC into parathyroid-like cells producing PTH hormone is hardly dependent on autophagy activation in the beginning of our conditions. Furthermore, our results of intracellular remodeling and accumulated endo-lysosomal storage bodies in the later stages of TMSC differentiation present a possible role of the structures in PTH secretion.
드론을 활용한 지표온도와 흡수일사 간 공간적 상관관계 분석 - 쿨루프 효과 분석을 중심으로 -
조영일,윤동현,이명진,Cho, Young-Il,Yoon, Donghyeon,Lee, Moung-Jin 대한원격탐사학회 2022 大韓遠隔探査學會誌 Vol.38 No.6
The purpose of this study is to determine the actual performance of cool roof in preventing absorbed solar radiation. The spatial correlation between surface temperature and absorbed solar radiation is the method by which the performance of a cool roof can be understood and evaluated. The research area of this study is the vicinity of Jangyu Mugye-dong, Gimhae-si, Gyeongsangnam-do, where an actual cool roof is applied. FLIR Vue Pro R thermal infrared sensor, Micasense Red-Edge multi-spectral sensor and DJI H20T visible spectral sensor was used for aerial photography, with attached to the drone DJI Matrice 300 RTK. To perform the spatial correlation analysis, thermal infrared orthomosaics, absorbed solar radiation distribution maps were constructed, and land cover features of roof were extracted based on the drone aerial photographs. The temporal scope of this research ranged over 9 points of time at intervals of about 1 hour and 30 minutes from 7:15 to 19:15 on July 27, 2021. The correlation coefficient values of 0.550 for the normal roof and 0.387 for the cool roof were obtained on a daily average basis. However, at 11:30 and 13:00, when the Solar altitude was high on the date of analysis, the difference in correlation coefficient values between the normal roof and the cool roof was 0.022, 0.024, showing similar correlations. In other time series, the values of the correlation coefficient of the normal roof are about 0.1 higher than that of the cool roof. This study assessed and evaluated the potential of an actual cool roof to prevent solar radiation heating a rooftop through correlation comparison with a normal roof, which serves as a control group, by using high-resolution drone images. The results of this research can be used as reference data when local governments or communities seek to adopt strategies to eliminate the phenomenon of urban heat islands.
0/1 재사용 라인들을 여과하여 LLC 성능을 개선시키는 캐시 교체 정책
조영일 水原大學校 2018 論文集 Vol.32 No.-
The last level cache(LLC) is commonly managed using LRU policy. However, LRU has a high overhead cost of moving cache lines into the most recently used position whenever a cache line is accessed. Also, LRU is prone to cache pollution when a sequence of single-use memory accesses that are larger than the cache size is fetched from memory. Cache performance and efficiency can be improved if some subset of these reuse lines can reside in the cache longer. Previous schemes approach this by bypassing never reused lines(0-reused lines). But, sometimes they deliver no benefit due to the lack of never reused lines. This paper proposes a new mechanism that filters out not only 0-reused lines but also 1-reused lines and accurately predicts 0/1-reused lines from incoming lines. Filtering of 0/1-reused lines provides more opportunities to fit the working set into cache size. The proposed scheme is evaluated using a simulation environment where its effectiveness and performance-improvement capabilities are demonstrated. The paper present experimental results showing IPC(Instruction Per Cycle) comparison of the proposed scheme and LRU for SPEC CPU2006 benchmarks. The result shows that the proposed scheme can improve IPC by an average of 20.1% and 9.2% compared to LRU in single core and multi-core, respectively.
조영일,Jong-Hyun Park,Chul-Won Lee,라원희,정종욱,Jung-Ro Lee,Kyung-Ho Ma,Seok-Young Lee,Kang-Seob Lee,Myung-Chul Lee,Yong-Jin Park 한국유전학회 2011 Genes & Genomics Vol.33 No.2
Sixteen polymorphic microsatellite (SSR) markers, developed from an SSR-enriched genomic DNA library of sesame (Sesamum indicum L.), were used to assess genetic diversity,phylogenetic relationships, and population structure among 150 sesame accessions collected from 22 countries. A total of 121 alleles were detected among the sesame accessions. The number of detected alleles varied from 2 to 18, with an average of 7.6 alleles per locus. Polymorphism information content values ranged from 0.03 to 0.79, with an average of 0.42. These values indicated an excess of heterozygous individuals at 16 loci and an excess of homozygous individuals at three loci. Of these, 32 genotype-specific alleles were identified at 11 of 16 polymorphic SSR markers. Cluster analyses were performed by accession and population, revealing a complex accession distribution pattern with mean genetic similarity coefficient of 0.45 by accession and 0.52 by population. The wide variation in genetic similarity among the accessions revealed by SSRs reflected a high level of polymorphism at the DNA level. Model-based structure analysis revealed the presence of three groups that were basically consistent with the clustering results based on genetic distance. These findings may be used to augment the sesame germplasm and to increase the effectiveness of sesame breeding.