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紫田惠司,孫泰俊 濟州大學校海洋硏究所 1994 해양과환경연구소 연구논문집 Vol.18 No.-
Since the pre-history era of japan. many literatures and techniques highly developedin in China.i.e.. rice plantation. Chinese letters. Buddism. ironworks. silk textiles. and so on had been imported via land passages of Korean Peninsular and sea routes between Korea and Japan. Japanese envoyes to Cjina in the weil Sui and tong Dynasties had often passed these routes or acrossed the east China Sea and the Yellow Sea and Chinese envoyes also came to Korea and Japan. The triffic routes have been changed due to developments of triffic boits in the above countries during long histories.
Kenji Miyamoto,Naotaka Shibata,Shigeru Kuwano,Jun Terada,Akihiro Otaka 한국통신학회 2018 Journal of communications and networks Vol.20 No.6
In this paper, we evaluate the wireless uplink performanceand the mobile fronthaul (MFH) bandwidth of split-physicallayer (PHY) processing (SPP), which is a base station (BS) functionalsplit scheme used to link baseband units (BBUs) and remoteradio heads (RRHs) in a centralized/cloud - radio access network(C-RAN). SPP enables MFH bandwidth reduction by splittingthe BS functions between channel coding/decoding and modulation/demodulation within the PHY layer functions. SPP alsoenables high coordinated multipoint (CoMP) transmission and receptionperformance by employing uplink joint reception (JR) withlog likelihood ratio (LLR) combining. Link level simulation resultsshow that SPP with LLR combining achieves a block error rate(BLER) performance of 10% with a signal to noise ratio (SNR)penalty of less than 1 dB compared with that of conventional CRAN,which centralizes PHY layer functions in BBU. In addition,SPP has an SNR gain of more than 3 dB over medium access control(MAC)-PHY split, which splits the BS functions between theMAC and PHY layer functions. System level simulation resultsshow that SPP with LLR combining improves the cell-edge userthroughput by more than 33% over MAC-PHY split with selectioncombining and reduces the MFH bandwidth by 91% when comparedwith conventional C-RAN. Moreover, link and system levelsimulation results above are also observed when the channel estimationis non-ideal.
Hagihara Shusuke,Ohta Hideki,Tanaka Jun,Shiokawa Teruaki,Kida Yoshikuni,Iguchi Yohei,Tatsumi Masato,Shibata Ryo,Tahara Kenichi,Shibata Tatsuya,Sanada Kyoichi,Ymamoto Takuaki 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.5
Study Design: This study adopted a retrospective cohort study design.Purpose: This study aimed to clarify the influence of diffuse idiopathic skeletal hyperostosis (DISH) on bone fusion after transforaminal lumbar interbody fusion (TLIF).Overview of Literature: The negative effects of DISH on lumbar degenerative diseases have been reported, and DISH may be involved in the onset and severity of lumbar spinal canal stenosis. Patients with DISH have significantly more reoperations after posterior lumbar fusion, including TLIF. However, the effects of DISH on bone fusion after TLIF have not been reported.Methods: The medical records of patients with intervertebral TLIF from 2012 to 2018 were retrospectively examined. The patients were divided into those with fusion and those with pseudoarthrosis, and the following data were compared: age, sex, DISH, diabetes mellitus, smoking, drinking, albumin levels, body mass index ≥30 kg/m<sup>2</sup>, and L5/S fixation. Statistical analyses were performed using regression models.Results: In this study, 180 patients (78.6%) had fusion and 49 patients (21.4%) had pseudoarthrosis. The number of patients with DISH was significantly higher in the pseudoarthrosis group than in the fusion group (36.7% and 21.7%, respectively; univariate <i>p</i>=0.031, multivariate p =0.019). No significant differences in age, sex, diabetes mellitus, smoking, drinking, albumin levels, body mass index ≥30 kg/m<sup>2</sup>, and L5/S fixation were observed between the two groups. The risk factors for bone fusion were statistically analyzed in 57 patients with DISH. DISH with a caudal end below Th11 was an independent risk factor for pseudoarthrosis (univariate <i>p</i>=0.011, multivariate <i>p</i>=0.033).Conclusions: DISH is an independent risk factor for pseudoarthrosis after one intervertebral TLIF, and DISH with a caudal end below Th11 is associated with a higher risk of pseudoarthrosis than DISH without a caudal end below Th11.
A High-Resolution Structure of the Pre-microRNA Nuclear Export Machinery
Okada, Chimari,Yamashita, Eiki,Lee, Soo Jae,Shibata, Satoshi,Katahira, Jun,Nakagawa, Atsushi,Yoneda, Yoshihiro,Tsukihara, Tomitake American Association for the Advancement of Scienc 2009 Science Vol.326 No.5957
<P>Nuclear export of microRNAs (miRNAs) by exportin-5 (Exp-5) is an essential step in miRNA biogenesis. Here, we present the 2.9 angstrom structure of the pre-miRNA nuclear export machinery formed by pre-miRNA complexed with Exp-5 and a guanine triphosphate (GTP)-bound form of the small nuclear guanine triphosphatase (GTPase) Ran (RanGTP). The x-ray structure shows that Exp-5:RanGTP recognizes the 2-nucleotide 3′ overhang structure and the double-stranded stem of the pre-miRNA. Exp-5:RanGTP shields the pre-miRNA stem from degradation in a baseball mitt-like structure where it is held by broadly distributed weak interactions, whereas a tunnel-like structure of Exp-5 interacts strongly with the 2-nucleotide 3′ overhang through hydrogen bonds and ionic interactions. RNA recognition by Exp-5:RanGTP does not depend on RNA sequence, implying that Exp-5:RanGTP can recognize a variety of pre-miRNAs.</P>
Study on the effect of long-term high temperature irradiation on TRISO fuel
Shaimerdenov Asset,Gizatulin Shamil,Dyussambayev Daulet,Askerbekov Saulet,Ueta Shohei,Aihara Jun,Shibata Taiju,Sakaba Nariaki 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.8
In the core of the WWR-K reactor, a long-term irradiation of tristructural isotopic (TRISO)-coated fuel particles (CFPs) with a UO2 kernel was carried out under high-temperature gas-cooled reactor (HTGR)- like operating conditions. The temperature of this TRISO fuel during irradiation varied in the range of 950 e1100 C. A fission per initial metal atom (FIMA) of uranium burnup of 9.9% was reached. The release of gaseous fission products was measured in-pile. The release-to-birth ratio (R/B) for the fission product isotopes was calculated. Aspects of fuel safety while achieving deep fuel burnup are important and relevant, including maintaining the integrity of the fuel coatings. The main mechanisms of fuel failure are kernel migration, silicon carbide corrosion by palladium, and gas pressure increase inside the CFP. The formation of gaseous fission products and carbon monoxide leads to an increase in the internal pressure in the CFP, which is a dominant failure mechanism of the coatings under this level of burnup. Irradiated fuel compacts were subjected to electric dissociation to isolate the CFPs from the fuel compacts. In addition, nondestructive methods, such as X-ray radiography and gamma spectrometry, were used. The predicted R/B ratio was evaluated using the fission gas release model developed in the high-temperature test reactor (HTTR) project. In the model, both the through-coatings of failed CFPs and as-fabricated uranium contamination were assumed to be sources of the fission gas. The obtained R/B ratio for gaseous fission products allows the finalization and validation of the model for the release of fission products from the CFPs and fuel compacts. The success of the integrity of TRISO fuel irradiated at approximately 9.9% FIMA was demonstrated. A low fuel failure fraction and R/B ratios indicated good performance and reliability of the studied TRISO fuel