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GPU-Based ECC Decode Unit for Efficient Massive Data Reception Acceleration
( Jisu Kwon ),( Moon Gi Seok ),( Daejin Park ) 한국정보처리학회 2020 Journal of information processing systems Vol.16 No.6
In transmitting and receiving such a large amount of data, reliable data communication is crucial for normal operation of a device and to prevent abnormal operations caused by errors. Therefore, in this paper, it is assumed that an error correction code (ECC) that can detect and correct errors by itself is used in an environment where massive data is sequentially received. Because an embedded system has limited resources, such as a lowperformance processor or a small memory, it requires efficient operation of applications. In this paper, we propose using an accelerated ECC-decoding technique with a graphics processing unit (GPU) built into the embedded system when receiving a large amount of data. In the matrix-vector multiplication that forms the Hamming code used as a function of the ECC operation, the matrix is expressed in compressed sparse row (CSR) format, and a sparse matrix-vector product is used. The multiplication operation is performed in the kernel of the GPU, and we also accelerate the Hamming code computation so that the ECC operation can be performed in parallel. The proposed technique is implemented with CUDA on a GPU-embedded target board, NVIDIA Jetson TX2, and compared with execution time of the CPU.
Kwon, Hyeok-jin,Ye, Heqing,An, Tae Kyu,Hong, Jisu,Park, Chan Eon,Choi, Yongseon,Shin, Seongjun,Lee, Jihoon,Kim, Se Hyun,Li, Xinlin Elsevier 2019 Organic electronics Vol.75 No.-
<P><B>Abstract</B></P> <P>Poly(chloro-p-xylene), or Parylene-C, is a polymeric insulating material that has good physical and chemical properties, such as a high dielectric strength, a pin-free surface, and good mechanical/chemical stability, but is difficult to apply to top-contact-structured OFETs since its hydrophobic and very rough surfaces hinder the growth of organic semiconductor crystals and promote the formation of interface traps. Herein, we applied a blend of PS and TIPS-PEN dissolved in 1,2,3,4 tetrahydronaphthalene to overcome these limitations of Parylene-C. To confirm the influence of this system, we analyzed the morphologies of crystals grown on Parylene-C surfaces modified by various organic and polymer materials, including methacryloxypropyltrimethoxysilane, hexamethyldisilazane, and dimethylchlorosilane-terminated polystyrene. Our investigation showed the ability of the PS:TIPS-PEN blend system to be used to overcome the above-described limitations of Parylene-C, and to manufacture top-contact OFETs displaying stable operation under gate-bias stress. Notably, we applied Parylene-C and this blend system in practical flexible OFETs that displayed highly stable properties.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Parylene-C film fabricated by CVD methods is characterized as gate insulating materials. </LI> <LI> Bottom gate top contact OFETs on hard/flexible substrate fabricated with TIPS-PEN: PS blend system and CVD based Parylene-C are reported. </LI> <LI> Morphological structure of TIPS-PEN is investigated using the tools including CPOM, SEM, AFM and 2D-GIXD. </LI> <LI> The OFETs show the mobility of 0.32, and 0.21 cm<SUP>2</SUP>/V in hard and flexible device type with negligible hysteresis both case. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Kwon, Mi-Jung,Park, Jisu,Jang, Sinae,Eom, Chi-Yong,Oh, Eok-Soo American Society for Biochemistry and Molecular Bi 2016 The Journal of biological chemistry Vol.291 No.2
<P>The transmembrane domain (TMD) of the syndecans, a family of transmembrane heparin sulfate proteoglycans, is involved in forming homo-and heterodimers and oligomers that transmit signaling events. Recently, we reported that the unique phenylalanine in TMD positively regulates intramolecular interactions of syndecan-2. Besides the unique phenylalanine, syndecan-2 contains a conserved phenylalanine (SDC2-Phe-169) that is present in all syndecan TMDs, but its function has not been determined. We therefore investigated the structural role of SDC2-Phe-169 in syndecan TMDs. Replacement of SDC2-Phe-169 by tyrosine (S2F169Y) did not affect SDS-resistant homodimer formation but significantly reduced SDS-resistant heterodimer formation between syndecan-2 and -4, suggesting that SDC2-Phe-169 is involved in the heterodimerization/oligomerization of syndecans. Similarly, in an in vitro binding assay, a syndecan-2 mutant (S2(F169Y)) showed a significantly reduced interaction with syndecan-4. FRET assays showed that heteromolecular interactions between syndecan-2 and -4 were reduced in HEK293T cells transfected with S2(F169Y) compared with syndecan-2. Moreover, S2(F169Y) reduced downstream reactions mediated by the heterodimerization of syndecan-2 and -4, including Rac activity, cell migration, membrane localization of PKC alpha, and focal adhesion formation. The conserved phenylalanine in syndecan-1 and -3 also showed heterodimeric interaction with syndecan-2 and -4. Taken together, these findings suggest that the conserved phenylalanine in the TMD of syndecans is crucial in regulating heteromeric interactions of syndecans.</P>
Jisu Lee,Tae Sun Ha,Jeonghwi Choi,Yeonhwa Kwon,Zisun Kim 대한외상중환자외과학회 2020 Journal of Acute Care Surgery Vol.10 No.3
Bariatric patients are at risk of diverse complications, such as bowel obstruction, internal hernia,and mesenteric thrombosis, which can result in massive small bowel resection with short bowelsyndrome (SBS) as a consequence. In this study a case of an internal hernia after childbirth in a36-year-old patient with a history of laparoscopic Roux-en-Y gastric bypass surgery is reported. An emergency laparotomy revealed an internal hernia in Petersen’s space with volvulus, causingextensive small bowel infarction and necrosis. SBS is a complicated multifaceted syndrome whichrequires a multidisciplinary approach, such as medical, nutritional, and pharmaceutical therapies,to optimize fluid and nutrient absorption over long-term monitoring and with revisions of thecare plan. To reduce the morbidity and mortality associated with an internal hernia and volvulus,clinicians must be acutely aware of a potential SBS diagnosis and not delay surgical exploration, evenif the vital signs, laboratory results, and imaging studies are normal.
Kwon, Hyeok-jin,Gao, Chun Yan,Tang, Xiaowu,Hong, Jisu,Park, Chan Eon,Kong, Hoyoul,Kim, Se Hyun,Yang, Hoichang Elsevier 2020 ORGANIC ELECTRONICS Vol.77 No.-
<P><B>Abstract</B></P> <P>Organic field-effect transistors (OFETs) have been fabricated by deposition of an organic semiconductor on inorganic dielectric layers like SiO<SUB>2</SUB>. However, inorganic oxide dielectrics have hydrophilic surface properties, which interrupts the growth of organic semiconductors with highly aligned and π-extended domains, and provide many absorbing sites for moisture that work as trap sites for charge carriers. To overcome this problem, a proper surface-treatment method is required to improve the morphology of organic semiconductors. In this study, we treat SiO<SUB>2</SUB> dielectrics with polystyrene (PS) and Cytop (a fluorinated cross-linkable polymer) to tune the surface properties when fabricating pentacene-based bottom-gate top-contact OFETs, and analyzed the influence of surface functionalization on the growth of the pentacene crystals under different deposition conditions and electrical device characteristics. By comparing the morphological features of pentacene with the device characteristics, the effect of hydrophobicity on the morphology of the pentacene polymorph, strongly related to the charge-transport mechanism, could be described.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Interfacial characteristic between active and dielectric layer is significant parts in morphological and electrical property in OFETs. </LI> <LI> Morphological structure of pentacene was investigated according to the hydrophobicity with PS and Cytop surface modification. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>