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Evaluation of Various Workloads in Filebench Suitable for Phase-change Memory
Seungyong Lee,Hyokeun Lee,Hyuk-Jae Lee,Hyun Kim 대한전자공학회 2021 IEIE Transactions on Smart Processing & Computing Vol.10 No.2
Phase-Change Memory (PCM) is known as the next generation of memory thanks to its outstanding properties, such as fast speed, non-volatility, scalability, and low power consumption. Based on these characteristics, PCM can be used in larger expanded memory or faster storage compared to HDD or NAND flash memory. Therefore, various companies are trying to deploy PCM-based memory products. However, studies on deciding the target system of PCM are still insufficient, which is an obstacle to the commercialization of PCM. In this paper, a file system benchmark, Filebench, is evaluated with various operating options to find the most appropriate workload for PCM as storage. An experiment was conducted in a virtual system by mounting PCM with a PCM-aware file system. The results demonstrate that the PCM-based system performs up to 500 times better than traditional storage if executing workloads with a significant amount of write operations and synchronization operations. A number of applications were tested on various configurations of systems, and workload characteristics suitable for the PCM-based system are presented.
Displaced subdivision surfaces of animated meshes
Lee, Hyunjun,Ahn, Minsu,Lee, Seungyong Elsevier 2011 Computers & graphics Vol.35 No.3
<P><B>Abstract</B></P><P>This paper proposes a novel technique for converting a given animated mesh into a series of displaced subdivision surfaces. Instead of independently converting each mesh frame in the animated mesh, our technique produces displaced subdivision surfaces that share the <I>same</I> topology of the control mesh and a <I>single</I> displacement map. We first propose a conversion framework that enables sharing the same control mesh topology and a single displacement map among frames, and then present the details of the components in the framework. Each component is specifically designed to minimize the shape conversion errors that can be caused by enforcing a single displacement map. The resulting displaced subdivision surfaces have a compact representation, while reproducing the details of the original animated mesh. The representation can also be used for efficient rendering on modern graphics hardware that supports accelerated rendering of subdivision surfaces.</P> <P><B>Graphical abstract</B></P><P>Conversion results of our methods. RMSEs are visualised as colors.<ce:figure id='f0065'></ce:figure></P><P><B>Highlights</B></P><P>► We propose a conversion method for animated meshes to displaced subdivision surfaces. ► Output meshes share the same control mesh connectivity and a single displacement map. ► The representation requires less storage and supports efficient rendering on GPU. ► Experimental results show our framework generates small shape conversion errors.</P>
Lee, Habeom,Manorotkul, Wanit,Lee, Jinhwan,Kwon, Jinhyeong,Suh, Young Duk,Paeng, Dongwoo,Grigoropoulos, Costas P.,Han, Seungyong,Hong, Sukjoon,Yeo, Junyeob,Ko, Seung Hwan American Chemical Society 2017 ACS NANO Vol.11 No.12
<P>Exploration of the electronics solely composed of bottom-up synthesized nanowires has been largely limited due to the complex multistep integration of diverse nanowires. We report a single-step, selective, direct, and on-demand laser synthesis of a hierarchical heterogeneous nanowire-on-nanowire structure (secondary nanowire on the primary backbone nanowire) without using any conventional photolithography or vacuum deposition. The highly confined temperature rise by laser irradiation on the primary backbone metallic nanowire generates a highly localized nanoscale temperature field and photothermal reaction to selectively grow secondary branch nanowires along the backbone nanowire. As a proof-of-concept for an all-nanowire electronics demonstration, an all-nanowire UV sensor was successfully fabricated without using conventional fabrication processes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2017/ancac3.2017.11.issue-12/acsnano.7b06098/production/images/medium/nn-2017-06098z_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn7b06098'>ACS Electronic Supporting Info</A></P>
Lee, Kyu-Tae,Yao, Yuan,He, Junwen,Fisher, Brent,Sheng, Xing,Lumb, Matthew,Xu, Lu,Anderson, Mikayla A.,Scheiman, David,Han, Seungyong,Kang, Yongseon,Gumus, Abdurrahman,Bahabry, Rabab R.,Lee, Jung Woo,P National Academy of Sciences 2016 Proceedings of the National Academy of Sciences Vol.113 No.51
<P>Emerging classes of concentrator photovoltaic (CPV) modules reach efficiencies that are far greater than those of even the highest performance flat-plate PV technologies, with architectures that have the potential to provide the lowest cost of energy in locations with high direct normal irradiance (DNI). A disadvantage is their inability to effectively use diffuse sunlight, thereby constraining widespread geographic deployment and limiting performance even under the most favorable DNI conditions. This study introduces a module design that integrates capabilities in flat-plate PV directly with the most sophisticated CPV technologies, for capture of both direct and diffuse sunlight, thereby achieving efficiency in PV conversion of the global solar radiation. Specific examples of this scheme exploit commodity silicon (Si) cells integrated with two different CPV module designs, where they capture light that is not efficiently directed by the concentrator optics onto large-scale arrays of miniature multi-junction (MJ) solar cells that use advanced III-V semiconductor technologies. In this CPV+ scheme ('+' denotes the addition of diffuse collector), the Si and MJ cells operate independently on indirect and direct solar radiation, respectively. On-sun experimental studies of CPV+ modules at latitudes of 35.9886 degrees N (Durham, NC), 40.1125 degrees N (Bondville, IL), and 38.9072 degrees N (Washington, DC) show improvements in absolute module efficiencies of between 1.02% and 8.45% over values obtained using otherwise similar CPV modules, depending on weather conditions. These concepts have the potential to expand the geographic reach and improve the cost-effectiveness of the highest efficiency forms of PV power generation.</P>
Lee, Woojung,Eom, Dae-Woon,Jung, Yujung,Yamabe, Noriko,Lee, Seungyong,Jeon, Youngsic,Hwang, Ye Ran,Lee, Ji Hwan,Kim, Yong Kee,Kang, Ki Sung,Kim, Su-Nam Institute for Advanced Research in Asian Science a 2012 The American journal of Chinese medicine Vol.40 No.6
<P>Obesity is an important and preventable risk factor for renal disease. The administration of an antioxidant with a lipid-lowering effect is an important therapeutic approach for kidney disease in obese patients. The present study was conducted to examine whether methanolic extract of Dendrobium moniliforme (DM), one of the most famous traditional medicines used in many parts of the world, has an antioxidant effect in vitro and an ameliorative effect on high-fat diet (HFD)-induced alterations such as renal dysfunction and lipid accumulation in vivo. The 1,1-diphenyl-2-picrylhydrazyl radical scavenging activity of DM extract (IC(50) = 29.6 μg/mL) was increased in a dose-dependent manner. The LLC-PK1 kidney cell damage induced by oxidative stress was significantly inhibited by the treatments with DM extract. In the animal study, DM extract (200 mg/kg) was orally administered every day for nine weeks to HFD-fed mice, and its effect was compared with that of metformin. The administration of DM extract decreased the elevated serum glucose, total cholesterol concentration and renal lipid accumulation in HFD-fed mice. It also ameliorated renal dysfunction biomarkers including serum creatinine and renal collagen IV deposition. Taken together, these results provide important evidence that DM extract exhibits a pleiotropic effect on obesity induced parameters and exerted a renoprotective effect in HFD-fed mice.</P>