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An Efficient Non-Linear Cost Compression Algorithm for Multi Level Cell Memory
Hyunok Oh,Jihye Kim IEEE 2014 IEEE Transactions on Computers Vol.63 No.4
<P>This paper defines a non-linear cost compression problem, proposes an efficient algorithm, and applies it to a real application of multi level cell memory to minimize energy consumption and latency. The non-linear cost compression problem extends the traditional cost compression problem to allow a non-linear cost function of symbol frequencies, while it is a weighted linear combination of symbol frequencies in the cost compression problem. In order to solve the non-linear cost compression problem efficiently, we propose an encoding symbol frequency based approach. We first compute frequencies of encoding symbols to minimize a cost function. To achieve the computed frequencies of a cost-compressed message, we deploy existing size-decompression algorithms. The proposed algorithm is optimal and as fast as the existing size compression algorithms. Our experimental results show that it reduces the energy consumption and latency by 70 percent for a text file in multi level cell memory. Furthermore, it increases the lifetime of endurance limited memory.</P>
오현옥(Hyunok Oh),하순회(Soonhoi Ha) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.12
본 논문에서는 서로 다른 수행 시간을 가지는 다중 프로세서를 대상으로 한 Best Imaginary Level (BIL) 스케줄링이라는 정적인 비선점 스케줄링 휴리스틱을 제안하였다. 스케줄링의 대상이 되는 입력 그래프는 선후 관계의 제약 조건을 가지는 비순환 그래프이며, 그래프 상의 각 노드는 각각의 프로세서에서 다른 수행 시간을 가진다. 노드의 정적인 레벨(BIL)은 프로세서간의 통신(IPC)을 고려하고 프로세서의 이종성도 고려한다. 제안된 스케줄링 기법이 입력 그래프의 모양이 선형인 경우 최적의 스케줄링 결과를 생성해 내는 것을 증명하였다. BIL 스케줄링은 현존하는 스케줄링 기법인 general dynamic level (GDL) 스케줄링 기법과 비교해서 다양한 형태의 무작위로 만들어낸 입력 그래프에 대해 약 20%의 성능 향상을 가져왔다. This paper presents a static scheduling heuristic called Best Imaginary Level (BIL) scheduling for heterogeneous processors. The input graph is an acyclic precedence graph, where a node has different execution times on different processors. The static level of a node, or BIL, incorporates the effect of interprocessor communication (IPC) overhead and processor heterogeneity. The proposed scheduling technique is proven to produce the optimal scheduling result if the topology of the input task graph is linear. The performance of the BIL scheduling is compared with an existing technique called the general dynamic level (GDL) scheduling with various classes of randomly.
Multiprocessor Scheduling of a Multi-Mode Dataflow Graph Considering Mode Transition Delay
Jung, Hanwoong,Oh, Hyunok,Ha, Soonhoi Association for Computing Machinery 2017 Transactions on Design Automation of Electronic Sy Vol.22 No.2
<P>The Synchronous Data Flow (SDF) model is widely used for specifying signal processing or streaming applications. Since modern embedded applications become more complex with dynamic behavior changes at runtime, several extensions of the SDF model have been proposed to specify the dynamic behavior changes while preserving static analyzability of the SDF model. They assume that an application has a finite number of behaviors (or modes), and each behavior (mode) is represented by an SDF graph. They are classified as multi-mode dataflow models in this article. While there exist several scheduling techniques for multi-mode dataflow models, no one allows task migration between modes. By observing that the resource requirement can be additionally reduced if task migration is allowed, we propose a multiprocessor scheduling technique of a multi-mode dataflow graph considering task migration between modes. Based on a genetic algorithm, the proposed technique schedules all SDF graphs in all modes simultaneously to minimize the resource requirement. To satisfy the throughput constraint, the proposed technique calculates the actual throughput requirement of eachmode and the output buffer size for tolerating throughput jitter. We compare the proposed technique with a method that analyzes SDF graphs in each execution mode separately, a method that does not allow taskmigration, and amethod that does not allowmode-overlapped schedule for synthetic examples and five real applications: H. 264 decoder, lane detection, vocoder, MP3 decoder, and printer pipeline.</P>
FAS: Forward secure sequential aggregate signatures for secure logging
Kim, Jihye,Oh, Hyunok Elsevier science 2019 Information sciences Vol.471 No.-
<P><B>Abstract</B></P> <P>Audit logs are an elemental part of computer systems due to their forensic value. Safeguarding audit logs on a physically unprotected machine are a challenging work, especially in the presence of active adversaries. Forward security is necessary for such a logging system. In this paper, we propose a new Forward secure sequential Aggregate Signature (FAS) scheme with optimal storage and communication for keys and signatures. To the best of our knowledge, our FAS scheme is the only scheme that has constant-sized public and secret keys as well as constant-sized aggregate signatures. Our proposed scheme supports aggregation of consecutive signatures by a third party. We prove the security of our proposed scheme under the hardness of factoring assumption, in the random oracle model.</P>
Genetic Comparison of Stemness of Human Umbilical Cord and Dental Pulp
Kang, Chung-Min,Kim, Hyunok,Song, Je Seon,Choi, Byung-Jai,Kim, Seong-Oh,Jung, Han-Sung,Moon, Seok-Jun,Choi, Hyung-Jun Hindawi Publishing Corporation 2016 Stem cells international Vol.2016 No.-
<P>This study focuses on gene expression patterns and functions in human umbilical cord (UC) and dental pulp (DP) containing mesenchymal stem cells (MSCs). DP tissues were collected from 25 permanent premolars. UC tissue samples were obtained from three newborns. Comparative gene profiles were obtained using cDNA microarray analysis and the expression of tooth development-associated and MSC-related genes was assessed by the quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR). Genes related to cell proliferation, angiogenesis, and immune responses were expressed at higher levels in UC, whereas genes related to growth factor and receptor activity and signal transduction were more highly expressed in DP. Although UC and DP tissues exhibited similar expression of surface markers for MSCs, UC showed higher expression of CD29, CD34, CD44, CD73, CD105, CD146, and CD166. qRT-PCR analysis showed that CD146, CD166, and MYC were expressed 18.3, 8.24, and 1.63 times more highly in UC, whereas the expression of CD34 was 2.15 times higher in DP. Immunohistochemical staining revealed significant differences in the expression of genes (<I>DSPP</I>,<I> DMP1</I>, and<I> CALB1</I>) related to odontogenesis and angiogenesis in DP. DP and UC tissue showed similar gene expression, with the usual MSC markers, while they clearly diverged in their differentiation capacity. </P>