Influence of consecutive increase of Opaque-Shade composite resin thickness on masking ability and translucency

학위논문 (석사)-- 서울대학교 대학원 : 치의학과, 2011.2. 손호현.Maste

수종의 교정용 접착제의 다세균종 바이오필름 형성 차이 연구

학위논문 (박사)-- 서울대학교 대학원 : 치의학대학원 치의과학과 치과교정학전공, 2016. 2. 안석준.Objective: This study investigated the aspects of multi-species biofilm formation on several orthodontic adhesives with different surface characteristics. Materials and Methods: Multi-species biofilms using 13 bacterial species were grown with three adhesives: composite (Transbond XT, TX), compomer (Transbond Plus, TP) and resin-modified glass ionomer (Multi-Cure, MC). The adhesion levels of Streptococcus mutans (Sm), Streptococcus sobrinus (Ss), Porphyromonas gingivalis (Pg), Aggregatibacter actinomycetemcomitans (Aa), and total bacteria were determined at day 1 (T1) and day 4 (T2) using real-time polymerase chain reaction. Surface roughness (SR), surface free energy (SFE), and surface texture were analyzed to explain the differences in bacterial compositions among the adhesives. Repeated measures analysis of variance was used to determine time-related differences in bacterial amounts and proportions of each species to total bacteria with respect to adhesive type. The Kruskal-Wallis test was used to determine differences in SR and SFE among the adhesives. Results: There were no significant differences in adhesion of total bacteria among orthodontic adhesiveshowever, the adhesion of Sm, Ss, and Pg was higher to MC than the other adhesives. MC also showed higher Sm and Ss proportion to total bacteria than the other adhesives. From T1 to T2, the amount of Sm, Ss, and total bacteria increased, while Pg and Aa decreased. However, proportions of all the tested bacteria to total bacteria were significantly decreased with increased incubation time. MC showed a rougher surface than TX or TP due to the presence of micro-pores and/or flaws. TP had the greatest SFE followed by MC and TX. Interestingly, SR differences were about 10 times greater than SFE differences between the adhesives. Conclusion: Considering the greater differences in SR than SFE among the adhesives, the rougher surface of MC may cause greater adhesion of Sm, Ss, and Pg.I. INTRODUCTION II. REVIEW OF LITERATURE III. MATERIALS AND METHODS IV. RESULTS V. DISCUSSION VI. CONCLUSIONS REFERENCESDocto

System and method of reducing traffic among multi-cores used to meet cache coherence

본 발명은 멀티 코어들 간의 통신량을 감소시키는 시스템에 관한 것으로서, 가상 메모리의 가상 페이지와 물리 메모리의 물리 페이지 간의 관계 및 상기 물리 페이지가 둘 이상의 코어에 의해 공유되고 있는지에 대한 공유 정보를 포함하는 페이지 테이블을 관리하는 운영체제; 상기 가상 페이지와 상기 물리 페이지 간의 관계 및 상기 가상 페이지와 상기 공유 정보를 포함하는 변환 참조 버퍼; 및 상기 페이지 테이블에 기록된 상기 가상 페이지와 상기 물리 페이지 간의 관계 또는 공유정보를 상기 변환 참조 버퍼에 기록하는 코어를 포함하는 것을 특징으로 하며, 필요하지 않은 코어들 간의 통신으로 인해서 발생하는 시스템의 성능 하락 및 전력 소모를 최소화할 수 있다

APPARATUS AND METHOD FOR ACCELERATING CRITICAL SERVICE IN VIRTUALIZED SYSTEM

본 발명의 기술적 사상에 의한 일 양태에 따른 복수의 가상 머신(Virtual Machine)이 통합된 통합 시스템의 동작 방법은 복수의 가상 머신 중 적어도 하나의 긴급한 서비스(critical service)를 탐지하는 단계, 상기 탐지된 긴급한 서비스를 가속화하기 위한 마이크로 슬라이스된 풀(Micro-sliced Pool)을 설정하는 단계, 및 상기 설정된 마이크로 슬라이스된 풀에 상기 탐지된 긴급한 서비스에 대응하는 가상 CPU(virtual CPU)를 마이그레이션하는 단계를 포함할 수 있다

일시적으로 변하지 않는 공유 특성을 활용한 부분공간 스누핑 프로토콜

학위논문(석사) - 한국과학기술원 : 전산학과, 2011.2, [ v, 34 p. ]Although snoop-based coherence protocols provide fast cache-to-cache transfers with a simple and robust coherence mechanism, scaling the protocols has been difficult due to the overheads of broadcast snooping. In this paper, we propose a coherence filtering technique called subspace snooping, which stores the potential sharers of each memory page in the page table entry. By using the sharer information in the page table entry, coherence transactions for a page generate snoop requests only to the subset of nodes in the system (subspace). However, the coherence subspace of a page may evolve, as the phases of applications may change or the operating system may migrate threads to different nodes. To adjust subspaces dynamically, subspace snooping supports two shrinking mechanisms, which remove obsolete nodes from subspaces. Subspace snooping can be integrated to any type of coherence protocols and network topologies. As subspace snooping guarantees that a subspace always contains the precise sharers of a page except for speculative shrink, it does not restrict the designs of coherence protocols and networks. We evaluate subspace snooping with Token Coherence on un-ordered mesh networks. For scientific and server applications on a 16-core system, subspace snooping reduces 62% of snoops on average.한국과학기술원 : 전산학과