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다중 시그니처 비교를 통한 트랜잭셔널 메모리의 충돌해소 정책의 성능향상
김덕호,오두환,노원우,Kim, Deok-Ho,Oh, Doo-Hwan,Ro, Won-W. 한국정보처리학회 2011 정보처리학회논문지 A Vol.18 No.1
다중 코어 프로세서가 널리 보급되면서 멀티 쓰레디드 프로그램 상의 동기화를 용이하게 구현할 수 있는 해결 방안으로 트랜잭셔널 메모리가 각광을 받고 있다. 이를 위해 고성능의 하드웨어 트랜잭셔널 메모리에 관한 연구가 활발히 진행되고 있으며, 대표적인 연구결과로 UTM, VTM, FastTM, LogTM, LogTM-SE 등이 소개되었다. 특히, 충돌 감지 정책으로 시그니처를 사용한 LogTM-SE는 효율적인 메모리 관리와 쓰레드 스케쥴링을 통해 고성능의 트랜잭셔널 메모리를 구현하였다. 하지만, 이 방식은 프로세서 내부의 코어 수가 증가하는 것에 비례하여 한 코어가 비교해야 하는 시그니처의 수가 증가하는 문제점을 갖고 있다. 이는 시그니처 처리 과정에서 병목현상을 야기하여 전체 성능을 저해하는 요인이 될 수 있다. 본 논문에서는 시그니처 비교 과정에서 나타날 수 있는 이러한 병목 현상을 개선하여 전체 트랜잭셔널 메모리의 성능 향상을 이루고자 다중 시그니처 비교 방식의 새로운 구조를 제안한다. As era of multi-core processors has arrived, transactional memory has been considered as an effective method to achieve easy and fast multi-threaded programming. Various hardware transactional memory systems such as UTM, VTM, FastTM, LogTM, and LogTM-SE, have been introduced in order to implement high-performance multi-core processors. Especially, LogTM-SE has provided study performance with an efficient memory management policy and a practical thread scheduling method through conflict detection based on signatures. However, increasing number of cores on a processor imposes the hardware complexity for signature processing. This causes overall performance degradation due to the heavy workload on signature comparison. In this paper, we propose a new architecture of multiple signature comparison to improve conflict detection of signature based transactional memory systems.
김덕호,이호택,백주희,이상연,Kim, Duk-Ho,Lee, Ho-Taek,Paik, Ju-Hee,Lee, Sang-Yeon 한국정신신체의학회 1997 정신신체의학 Vol.5 No.2
Electroconvulsive therapy(ECT) is one of the most effective treatment modalities for the treatment of depression, mania, schizophrenia, or other neuropsychiatric disorders. But, reportedly ECT also can produce various forms of cardiac arrhythmia. We experienced a case of ECT-induced arrhythmia(PVC) accompanied with chest pain in a schizophrenic patient during the course of plain ECT. We conclude that there is a possible causal relationship between ECT and cardiac arrhythmia(PVC). The mechanisms of cardiac arrhythmia(PVC) due to ECT may be explained by the effects of ECT to vagal and sympathetic nervous systems. from this case report, We suggest that careful cardiac monitoring before, during, and after ECT with appropriate anesthetic preparation to a patient may enable to minimize the cardiovascular side effects of ECT in the patients with neuropsychiatric disorders.
김덕호,한진오,신병관,이규일,Kim, Deok-Ho,Han, Jin-O,Sin, Byeong-Gwan,Lee, Gyu-Il 대한기계학회 2001 KSME International Journal Vol.15 No.11
In this paper, an advanced shift controller that supervises the shift transients with adaptive compensation is presented. Modern shift control systems for vehicle automatic transmission are designe d to provide smooth transients for passengers' comfort and better component durability. In the conventional methods, lots of testing and calibration works have been done to tune gains of the controller, but it does not assure optimum shift quality at all times owing to system variations often caused by uncertainties in shifting hydraulic systems and external disturbances. In the proposed control scheme, an adaptive compensation controller with intelligent supervisor is implemented to achieve improved shift quality over the system variations. The control input pattern which generates clutch pressure commands in hydraulic actuating systems, is updated through a learning process to adjust for each subsequent shift based on continuous monitoring of shifting performance and environmental changes. The proposed algorithm is implemented and evaluated on the experimental test setup. Results from the experimental studies for several operation modes show both improved performance and adaptability of the proposed shift controller to uncertain changes of the shifting environment in vehicle power transmission systems.
An Efficient Parallelized Algorithm of SEED Block Cipher on Cell BE
김덕호,이재영,노원우,Kim, Deok-Ho,Yi, Jae-Young,Ro, Won-Woo Korea Information Processing Society 2010 정보처리학회논문지 A Vol.17 No.6
본 논문에서는 Cell BE 프로세서를 사용한 효율적인 병렬 블록 암호화 알고리즘을 제시한다. 제안하는 알고리즘은, 이종 프로세서인 Cell BE의 특성을 효율적으로 활용하기 위하여 PPE와 SPE에 서로 다른 부호화/복호화 방식을 적용하여 그 성능을 개선하였다. 본 논문에 제시된 구현 방식을 바탕으로 검증된 결과에 따르면, 제안하는 알고리즘은 고성능 네트워크 시스템을 지원할 수 있는 2.59Gbps의 성능을 보여준다. 이는, 다른 다중 코어 프로세서의 병렬 구현 방식과 비교할 때, 1.34배 증가된 성능의 부호화/복호화 속도를 제공한다. In this paper, we discuss and propose an efficiently parallelized block cipher algorithm on the CELL BE processor. With considering the heterogeneous feature of the CELL BE architecture, we apply different encoding/decoding methods to PPE and SPE and improve the throughput. Our implementation was fully tested, with execution results showing achievement of high throughput, capable of supporting as high network speed as 2.59 Gbps. Compared to various parallel implementations on multi-core systems, our approach provides speedup of 1.34 in terms of encoding/decoding speed.
AFM-based identification of the dynamic properties of globular proteins: simulation study
김덕호,박정열,Moon K. Kim,홍금식 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.11
Nowadays a mathematical model-based computational approach is getting more attention as an effective tool for understanding the mechanical behaviors of biological systems. To find the mechanical properties of the proteins required to build such a model, this paper investigates a real-time identification method based on an AFM nanomanipulation system. First, an AFM-based bio-characterization system is introduced. Second, a second-order time-varying linear model representing the interaction between an AFM cantilever and globular proteins in a solvent is presented. Finally, we address a real-time estimation method in which the results of AFM experiments are designed to be inputs of the state estimator proposed here. Our attention is restricted to a theoretical feasibility analysis of the proposed methodology. We simply set the mechanical properties of the particular protein such as mass, stiffness, and damping coefficient in the system model prior to running the simulation. Simulation results show very good agreement with the preset properties. We anticipate that the realization of the AFM-based bio-characterization system will also provide an experimental validation of the proposed identification procedure in the future. This methodology can be used to determine a model of protein motion for the purpose of computer simulation and for a real-time modification of protein deformation.
김덕호,윤석,강현재,김병규,Kim, Deok-Ho,Yun, Seok,Kang, Hyun-Jae,Kim, Byung-Kyu 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.12
In biological cell manipulation, manual thrust or penetration of an injection pipette into an embryo cell is currently performed by a skilled operator, relying on visual feedback information only. Accurately measuring cellular forces is a requirement for minimally invasive cell injections. Moreover, the cellular force sensing is essential in investigating the biophysical properties for cell injury and membrane modeling studies. This paper presents cellular force measurements for the force feedback-based biomanipulation. Cellular force measurement system using piezoelectric polymer sensor is implemented to measure the penetration force of a zebrafish egg cell. First, measurement system setup and calibration are described. Second, the force feedback-based biomanipulation is experimentally carried out. Experimental results show that it successfully supplies real-time cellular force feedback to the operator at tens of uN and thus plays a main role in improving the reliability of biological cell injection tasks.