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양순섭,고영웅,유혁 고려대학교 컴퓨터과학기술연구소 2001 JOURNAL OF COMPUTER SCIENCE & ENGINEERING TECHNOLO Vol.3 No.-
기존의 커널 구조는 응용프로그램의 요구에 따라 커널의 기능을 고치거나 새로이 추가하는 것이 커널 자체의 복잡성으로 인하여 어려운 점이 많고 커널 내의 기능성들을 모듈화 함으로써 어려움을 극복하고자 하고 있다. 하지만 응용프로그램이 다양화되고 이러한 응용프로그램들의 요구에 따라 커널 내의 기능성이 변경되거나 추가됨으로써 이러한 모듈화는 깨어지고 있다. 즉 변경되거나 새로이 추가될 기능성을 미리 예측하는 것이 불가능하기 때문에 어떠한 모듈을 접근하는데 있어 고정된 1차원적인 인터페이스만으로는 모듈화를 유지하기가 힘들게 되고 특히 멀티미디어와 같은 새로운 응용프로그램들은 기존의 커널에 많은 새로운 기능들의 추가를 요구하고 있어서 상황은 더욱 악화되고 있다. 본 논문에서는 이러한 커널 복잡도를 낮추고 커널 구조를 보다 유연하게 만들기 위한 방안으로서 코어커널(CoreKernel)과 커널컴포넌트(KernelComponent)들의 집합으로서 커널을 구성하는 컴포넌트 커널 프레임워크(Component Kernel Framework)를 제시하고 이에 기반한 커널의 동적 확장 모델을 설계한다. 제시한 컴포넌트 기반 커널 확장 모델을 검증하고자 현재 개발중인 커널 프로토타입 소개하고 시뮬레이션을 통해 제안된 동적 확장 모델을 검증한다. Traditional kernels like UNIX have lots of difficulties in adding and modifying kernel functionalities due to inherent complexities of kernel architecture. They try to solve these problems through modularization. As there come to be a diversity of application programs and they require modification of existing kernel functionalities and addition of new ones, Modularity of kernel tends to be broken. In other words, because it is difficult to expect which functionality should be modified and what functionality should be newly added, To keep modularity of kernel is almost impossible if the modules are accessed only through fixed one-dimensional interface. This situation is likely to happen as multimedia applications that require new kernel functionalities like real-time scheduling and memory reservation become popular. Trying to decrease kernel complexities and to make kernel more modularized, this paper suggests Kernel Component Framework that construct kernel of Corekernel and a set of KernelComponents and then designs dynamic kernel extension model based on Kernel Component Framework. To verify suggested component-based kernel extension model, we introduce kernel prototype now being developed and simulate dynamic extension model.
Ko, Byung Woong,Han, Jeongsu,Heo, Jun Young,Jang, Yunseon,Kim, Soo Jeong,Kim, Jungim,Lee, Min Joung,Ryu, Min Jeong,Song, Ik Chan,Jo, Young Suk,Kweon, Gi Ryang Informa UK (Informa Healthcare) 2016 Leukemia & lymphoma Vol.57 No.9
<P>Long-term imatinib treatment induces drug-resistant chronic myeloid leukemia (CML) cells harboring T315I gate keeper mutation of breakpoint cluster region (BCR)-ABL oncogenic kinase. However, although cell proliferation is coupled with cellular energy status in CML carcinogenesis, the metabolic characteristics of T315I-mutant CML cells have never been investigated. Here, we analyzed cell proliferation activities and metabolic phenotypes, including cell proliferation, oxygen consumption, lactate production, and redox state in the KBM5 (imatinib-sensitive) and KBM5-T315I (imatinib-resistant) CML cell lines. Interestingly, KBM5-T315I cells showed decreased cell proliferation, lactate production, fatty acid synthesis, ROS production, and down regulation of mRNA expression related to ROS scavengers, such as SOD2, catalase, GCLm, and GPx1. Taken together, our data demonstrate that the lower growth ability of KBM5-T315I CML cells might be related to the decreased expression of glycolysis-related genes and ROS levels, and this will be used to identify therapeutic targets for imatinib resistance in CML.</P>
Rate-based Page Fault Handling Mechanism for Soft Real-time Task
Ko, Young Woong,Yoo, Chuck 고려대학교 컴퓨터과학기술연구소 2003 JOURNAL OF COMPUTER SCIENCE & ENGINEERING TECHNOLO Vol.5 No.-
In virtual memory system, whenever a new task is dynamically launched, it suffers from transient overload that caused by excessive page fault handing. As transient overload state occurred, the QoS of multimedia application may be degraded because the deadine miss ratio is increased. In this paper, we suggest new methodology that supports soft real-time task efficiently. To improve real-time characteristics in memory management, we present efficient memory management techniques called Rate-based Page Fault Handling mechanism. With these mechanism, we can support soft real-time characteristics in memory constraint situation. A significant feature of the mechanism is resource reservation for kenel activity and page fault dispersion based on per process limit. We implement the memory management mechanism on Linux kernel and present the experiment results with Berkeley MPEG-1 video decoder. Experiment result shows that our mechanism could achieve 10%-20% reduction in deadline miss ratio and 50%-60% reduction in average delay.
Application-controlled Multimedia Scheduling
Ko, Young Woong,Yoo, Chuck 고려대학교 컴퓨터과학기술연구소 2002 JOURNAL OF COMPUTER SCIENCE & ENGINEERING TECHNOLO Vol.4 No.-
Real-time scheduling algorithms such as Rate Monotonic and Earliest Deadline First are a basis for many multimedia scheduling algorithms. However, real-time scheduling mechanisms have drawbacks to multimedia applications. One of them is that multimedia application such as digital video has a large variation in execution time, which makes real-time scheduling algorithms very inefficient in terms of resource utilization. To improve the resource utilization, this paper introduces an application-controlled approach. A task passes scheduling information to the scheduler so that the scheduler dynamically changes the priority of the task. In addition, an advantage of our approach is that multimedia tasks are scheduled based on priority only. Therefore, multimedia tasks do not penalize time-sharing tasks. We implement the new scheduler on Linux kernel and present the experiment results with Berkeley MPEG-1 video decoder.