• Title, Summary, Keyword: SSD

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iSSD-Based Collaborative Processing for Big Data Mining (효율적인 빅 데이터 마이닝을 위한 iSSD 기반 협업 처리 방안)

  • Jo, Yong-Yoen;Kim, Sang-Wook;Bae, Duck-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.42 no.2
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    • pp.460-470
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    • 2017
  • We address how to handle big data mining effectively using the intelligent SSD (iSSD). ISSD is a storage device equipped with computing power inside SSD for reducing the transferring cost and for processing data nearby SSD where the data is stored. We first introduce the structural characteristics of iSSD for efficient data processing. Then, we present how to process data mining algorithms by using iSSD. Finally, we discuss how to improve the performance of data mining algorithms significantly by exploiting heterogeneous computing environment where host CPUs and GPU coexist for maximizing the performance.

Combination System Design of 5G Candidate Modulation and Full Duplex Communication for the Spectrum Efficiency Enhancement (스펙트럼 효율 향상을 위한 전이중 통신 방식과 5G 후보 변조기술과의 결합시스템 설계)

  • An, Changyoung;Ryu, Heung-Gyoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.4
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    • pp.369-376
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    • 2016
  • In this paper, we propose and design a SSD(Simultaneous Single band Duplex) system using 5G(Generation) candidate modulations. Especially, we consider HPA(High Power Amplifier) nonlinearity in the proposed system. And then, we evaluate and analyze performance of the proposed system. As simulation results, performance of SSD-OFDM(Orthogonal Frequency Division Multiplexing), SSD-FMC (Universal Filtered Multi-Carrier), and SSD-FBMC(Filter Bank Multi-Carrier) is severely degraded by HPA nonlinearity. However, performance of SSD-OFDM, SSD-UFMC, and SSD-FBMC is similar in the same condition. That is, OFDM, UFMC, and FBMC have a similar PAPR(Peak to Average Power Ratio) characteristic. Finally, we can confirm that the proposed SSD system can not cancel(SI) self-interference effectively by strong HPA nonlinearity. That is, Reducing PAPR is important in order to avoid effect of HPA nonlinearity in the proposed SSD system.

Use of Bulking Agent for Efficient Vermicomposting of Swine Manure (돈분의 효율적인 지렁이 퇴비화를 위한 Bulking Agent의 이용)

  • Hwangbo, Soon;Jo, Ik-Hwan
    • Korean Journal of Organic Agriculture
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    • v.22 no.1
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    • pp.197-208
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    • 2014
  • The present study was conducted to provide basic data for efficient vermicomposting of swine manure by investigating the effect of sawdust mix on growth and reproduction of earthworms, amount of earthworm cast produced, and its chemical composition when mixing swine manure in different levels (0(SSD0), 10(SSD10), 20(SSD20), 30(SSD30), and 40%(SSD40)) with sawdust commonly used as moist control in manure composting. The C/N ratio of the feed and the survival rate of earthworms for the SSD0 treatment (10.19, 35.2%), The C/N ratio of the feed was 11.09-16.44 and increased with higher level of sawdust mixed, and the survival rate of earthworms during the experiment period was 35.2-100%. The number of earthworms was 16.6 in the SSD40 treatment, and young worms were not found in the SSD0 treatment or the treatment with less than 30% sawdust in the mix. The number and the weight of cocoons in SSD30 and SSD40 treatments were found to be in the ranges of 23.8-59.8 and 256-660 mg respectively. The production of earthworm cast and digested amount were higher with the higher level of mixed sawdust (p<0.05), and the C/N ratio of cast increased with the mixed sawdust ratio, being significantly higher ratio in SSD30 and SSD40 than other treatments (p<0.05). Heavy metals content tended to decrease with the mixed sawdust level. To summarize, the higher level of mixed sawdust was associated with improvement in growth and reproduction of earthworms, and 30-40% sawdust mix in particular could result in efficient vermicomposting.

A Design of 256GB volume DRAM-based SSD(Solid State Drive) (256GB 용량 DRAM기반 SSD의 설계)

  • Ko, Dea-Sik;Jeong, Seung-Kook
    • The Journal of Advanced Navigation Technology
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    • v.13 no.4
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    • pp.509-514
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    • 2009
  • In this paper, we designed and analyzed 256GB DRAM-based SSD storage using DDR1 memory and PCI-e interface. SSD is a storage system that uses DRAM or NAND Flash as primary storage media. Since the SSD read and write data directly to memory chips, which results in storage speeds far greater than conventional magnetic storage devices, HDD. Architecture of the proposed SSD system has performance of high speed data processing duo to use multiple RAM disks as primary storage and PCI-e interface bus as communication path of RAM disks. We constructed experimental system with UNIX, Windows/Linux server, SAN Switch, and Ethernet Switch and measured IOPS and bandwidth of proposed SSD using IOmeter. In experimental results, it has been shown that IOPS, 470,000 and bandwidth,800MB/sec of the DDR-1 SSD is better than those of the HDD and Flash-based SSD.

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An performance analysis on SSD caching mechanism in Linux (리눅스 SSD caching mechanism 의 성능 비교 및 분석)

  • Heo, Sang-Bok;Park, Jinhee;Jo, Heeseung
    • Smart Media Journal
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    • v.4 no.2
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    • pp.62-67
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    • 2015
  • During several decades, hard disk drive(HDD) has been used in most computer systems as secondary storage and, however, the performance enhancement of HDD is limited by its mechanical properties. On the other hand, although the flash memory based solid state drive (SSD) has more advantages over HDD such as high performance and low noise, SSD is still too expensive for common usage and expected to take several years to replace HDD completely. Therefore, SSD caching mechanism using the SSD as a cache of high capacity HDD has been highlighted lately. The representatives of SSD caching mechanisms are typically bcache, dm-cache, Flashcache, and EnhanceIO. Each of them has its own internal mechanism and implementation, and this makes them to show their own pros. and cons. In this paper, we analyze the characteristics of each SSD caching mechanisms and compare the performance of them under various workloads. We expect that our contribution will be useful to enhance the performance of SSD caching mechanisms.

Multi Scale Object Detection Based on Single Shot Multibox Detector with Feature Fusion and Inception Network

  • Haque, Md Foysal;Kang, Dae-Seong
    • 한국정보기술학회논문지
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    • v.16 no.10
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    • pp.93-100
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    • 2018
  • Inception layers are most effective and constructive architecture in current object detection field. Moreover, beside Inception layers, feature fusion layers also shows significant performance for object detection. Single Shot Multibox Detector(SSD) is one of the most convenient and fastest algorithms in the current object detection field. SSD uses only a single convolutional neural network to detect the object from the input. Moreover, SSD algorithm shows high accuracy to detect multi-scale objects but detecting small objects SSD network performance is not satisfactory. In this paper, we added feature fusion layers and Inception layers with SSD to increase its performance. In this paper, our main focus to improve the features of different layers by feature fusion and also minimize the calculation cost by Inception. Moreover, here in SSD, we add extra layers to improve its performance without any affecting on its speed. By adding Inception layers and feature fusion layers, SSD network can catch more information without increasing the complexity of the network and it also able to detect more small objects. The new proposed algorithm can detect small and big objects with satisfactory accuracy.

Acceleration Method of RAID Level 5 for DDR-SSD (DDR-SSD를 위한 RAID 레벨 5의 고속화 방법)

  • Gu, Bon-Gen;Kwak, Yun-Sik;Jeong, Seung-Kook;Hwang, Jung-Yeon
    • The Journal of Advanced Navigation Technology
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    • v.13 no.5
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    • pp.684-690
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    • 2009
  • In this paper, we propose the acceleration method of the DDR-SSD RAID level 5. The DDR-SSD is the storage device of the Next Generation Storage(NGS) system. The DDR-SSD has different characteristics with HDD and Flash SSD. That's why the DDR-SSD RAID level 5 does not provide the best performance when the normal acceleration method is used. In this paper, to accelerate the DDR-SSD RAID level 5 operation, we propose the parity cache and the architecture of the parity cell. The parity cache stores only parity blocks. This acceleration method proposed in this paper reduce the number of the disk access and the overhead of parity operations.

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Selective Recovery of the SSD TRIM Command in Digital Forensics (디지털 포렌식 관점에서 SSD TRIM 명령의 선별적 복구)

  • Hwang, Hyun Ho;Park, Dong Joo
    • KIPS Transactions on Computer and Communication Systems
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    • v.4 no.9
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    • pp.307-314
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    • 2015
  • Recently, market trends of auxiliary storage device HDD and SSD are interchangeable. In the future, the SSD is expected to be used more popular than HDD as an auxiliary storage device. The TRIM command technique has been proposed and used effectively due to the development of the SSD. The TRIM command techniques can be used to solve the problem of Freezing SSD that operating system cooperates with the SSD. The TRIM command techniques are performed in the idle time of the internal SSD that are actually deleted when a user deletes the data. However, in the point of view of computer forensics, the digital crime is increasing year by year due to lack of data recovery. Thus, this rate of arrest is insufficient. In this paper, I propose a solution that selectively manages data to delete based on advantage of the stability and the write speed of the TRIM command. Through experiments, It is verified by measuring the performance of the traditional method and selected method.

Data Mining in Intelligent SSD: Simulator Based Evaluation (시뮬레이터 기반 iSSD에서 데이터 마이닝 알고리즘 성능 평가)

  • Chung, Moonjun;Jo, Yong-Yoen;Kim, Sang-Wook;Oh, Hyunok
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1126-1127
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    • 2015
  • Intelligent SSD (iSSD)는 SSD 내부에 프로세서들을 장착하여 데이터를 처리할 수 있도록 한 저장 장치이다. 본 논문은 iSSD 시뮬레이터를 이용하여 다양한 데이터 마이닝 알고리즘을 수행함으로써 iSSD의 가능성 및 효용성을 확인해 보고자 한다.

Fatigue Life Estimation of Solid-state Drive due to the Effect of Dummy Solder Ball under Forced Vibration (SSD 강제진동 시 더미 솔더 볼 효과에 의한 피로수명 예측)

  • Lee, Juyub;Jang, Gunhee;Jang, Jinwoo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.3
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    • pp.176-183
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    • 2015
  • This research proposes a method to estimate the fatigue life of SSD(solid-state drive) due to the effect of dummy solder ball under forced vibration. A finite element model of the SSD was developed to simulate the forced vibration and a modal testing was performed to verify the developed finite element model. Fatigue life of the SSD under vibration was experimentally determined according to JEDEC standard in which the SSD was excited by a sinusoidal sweep vibration within the narrow frequency band around the first natural frequency until the SSD fails. Basquin's equation was introduced to estimate the fatigue life of the SSD due to the effect of dummy solder balls. It shows that the dummy solder balls are effective elements of the SSD to increase the fatigue life of an SSD by increasing 700 times of the fatigue life of the given SSD.