Seoul National University

About: Seoul National University is a education organization based out in Seoul, South Korea. It is known for research contribution in the topics: Population & Catalysis. The organization has 65879 authors who have published 138759 publications receiving 3715170 citations. The organization is also known as: SNU & Seoul-dae.

PIM-enabled instructions: a low-overhead, locality-aware processing-in-memory architecture

Abstract: Processing-in-memory (PIM) is rapidly rising as a viable solution for the memory wall crisis, rebounding from its unsuccessful attempts in 1990s due to practicality concerns, which are alleviated with recent advances in 3D stacking technologies. However, it is still challenging to integrate the PIM architectures with existing systems in a seamless manner due to two common characteristics: unconventional programming models for in-memory computation units and lack of ability to utilize large on-chip caches. In this paper, we propose a new PIM architecture that (1) does not change the existing sequential programming models and (2) automatically decides whether to execute PIM operations in memory or processors depending on the locality of data. The key idea is to implement simple in-memory computation using compute-capable memory commands and use specialized instructions, which we call PIM-enabled instructions, to invoke in-memory computation. This allows PIM operations to be interoperable with existing programming models, cache coherence protocols, and virtual memory mechanisms with no modification. In addition, we introduce a simple hardware structure that monitors the locality of data accessed by a PIM-enabled instruction at runtime to adaptively execute the instruction at the host processor (instead of in memory) when the instruction can benefit from large on-chip caches. Consequently, our architecture provides the illusion that PIM operations are executed as if they were host processor instructions. We provide a case study of how ten emerging data-intensive workloads can benefit from our new PIM abstraction and its hardware implementation. Evaluations show that our architecture significantly improves system performance and, more importantly, combines the best parts of conventional and PIM architectures by adapting to data locality of applications.

The analysis and compensation of dead-time effects in PWM inverters

Abstract: The quantitative prediction of the dead-time effect in pulse width modulated (PWM) inverters is addressed. Through analysis and simulation it is shown that the effect results in a decrease of the fundamental component and an increase in the low-order harmonics in the output voltage of the inverter. To compensate the effect, two simple methods, which are adequate for sinusoidal PWM and memory-based PWM, respectively, are presented. Experimental results show the validity of the analysis and the usefulness of the compensation methods. >

Tiger Technology: The Creation of a Semiconductor Industry in East Asia

Abstract: List of figures List of tables Preface Abbreviations Introduction Part I. The 'Real' East Asian Miracle: 1. Tiger chips: the rise of East Asia in the global semiconductor industry 2. Technology leverage as latecomer strategy Part II. National Institutional Pathways: 3. The Tangbun boom and the chaebol: how Korea did it 4. A cat can look at a king: how Taiwan did it 5. Jack and the beanstalk: how Singapore and Malaysia are doing it Part III. The Technology Leverage Strategy: 6. East Asian semiconductor industries: national strategies and sustainability 7. Limits to technology leverage strategies 8. National systems of economic learning: lessons from East Asia Appendix I. Exchange rates: 1975-97 Appendix II. Chronology Glossary Bibliography Index.