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First upper limits on the radar cross section of cosmic-ray induced extensive air showers
Abbasi, R.U.,Abe, M.,Abou Bakr Othman, M.,Abu-Zayyad, T.,Allen, M.,Anderson, R.,Azuma, R.,Barcikowski, E.,Belz, J.W.,Bergman, D.R.,Besson, D.,Blake, S.A.,Byrne, M.,Cady, R.,Chae, M.J.,Cheon, B.G.,Chib North-Holland 2017 Astroparticle physics Vol.87 No.-
<P>TARA (Telescope Array Radar) is a cosmic ray radar detection experiment colocated with Telescope Array, the conventional surface scintillation detector (SD) and fluorescence telescope detector (FD) near Delta, Utah, U.S.A. The TARA detector combines a 40 kW, 54.1 MHz VHF transmitter and high-gain transmitting antenna which broadcasts the radar carrier over the SD array and within the FD field of view, towards a 250 MS/s DAQ receiver. TARA has been collecting data since 2013 with the primary goal of observing the radar signatures of extensive air showers (EAS). Simulations indicate that echoes are expected to be short in duration (similar to 10 mu s) and exhibit rapidly changing frequency, with rates on the order 1 MHz/mu s. The EAS radar cross-section (RCS) is currently unknown although it is the subject of over 70 years of speculation. A novel signal search technique is described in which the expected radar echo of a particular air shower is used as a matched filter template and compared to waveforms obtained by triggering the radar DAQ using the Telescope Array fluorescence detector. No evidence for the scattering of radio frequency radiation by EAS is obtained to date. We report the first quantitative RCS upper limits using EAS that triggered the Telescope Array Fluorescence Detector. (C) 2016 Elsevier B.V. All rights reserved.</P>
이지열,류천인,남성우,이송규 한국균학회 1980 韓國菌學會誌 Vol.8 No.1
To increase production of Tricholoma matsutake, experiments were carried out in a mountain located in Keumma 2-ri, Joocheon-myun, Yongwol-gun, Kangwon-do, Korea during the period from April to November 1979. The area of the experiment showed pH 6.55 of soil acidity`and the rock was found to be granite. Among its vegetation, the major growths were Pinus densiflora Siebold et Zuccarini, Rhododerulron mucronulatum Turcz., Rhododendron schlippenbachii Max., Lespedesa bicolor and Pteridium aquilinum (Linne) Kuhn var. japonicum Nakai. Of two equally divided areas of A and B in which pine mushrooms grew, artificial methods such as thinning the upper portion of land raking and water-spraying were applied to area B only, where 21% increase of the production was obtained as compared with the control area A.
Hepatitis B Reactivation among Chronic Hepatitis C Patients Treated with Direct Acting Antivirals
( Hee Yeon Kim ),( Chang Wook Kim ),( Jin Ah Kim ),( Mi Ju Cheon ),( Chan Ran You ),( Sang Wook Choi ),( Se Hyun Cho ),( Joon-Yeol Han ),( Do Seon Song ),( U Im Chang ),( Jin Mo Yang ),( Sung Won Lee 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1
Aims: This study aimed to investigate hepatitis B virus (HBV) reactivation among hepatitis C virus (HCV) infected patients treated with oral direct acting antiviral (DAA) therapy in areas endemic for HBV in Korea. Methods: A total of 821 HCV-infected patients receiving oral DAA therapy from March 2015 to November 2016 were evaluated. Serum HBV DNA and HCV RNA was regularly assessed during and after DAA treatment in patients with HBV-HCV coinfection. HBV virological reactivation was defined as a >1 log increase in HBV DNA from baseline or a reappearance of HBV DNA for those with baseline undetectable HBV DNA. Clinical reactivation was defined as a serum alanine aminotransferase level ≥3-fold over the upper limit of normal or > 100 U/L. Results: Prior to DAA therapy 95.8% (787/821) had HBsAg testing and 1.7% (13/787) were positive. HBV virological reactivation was found in 7 (53.8%) of the 13 patients. HBV-related clinical reactivation was not observed in our cohort. Conclusions: For HBV-HCV co-infected patients, the risk of HBV virological reactivation was present after oral DAA treatment for HCV infection. Monitoring the HBV DNA level during oral DAA therapy for HCV infection is warranted.
항만물류 서비스품질과 관계품질이 관계지속의도에 미치는 영향
정우천(U-cheon Jeong),하명신(Myung-shin Ha),배상욱(Sang-wook Bae) 한국국제상학회 2011 國際商學 Vol.26 No.1
This paper studies that Busan Port boosts its relation continuity intention with customers as part of efforts to survive the cutthroat competition among regions and countries and to gain a competitive advantage over rivals. The establishment of such a relation continuity intention is based not only on a number of study results showing that raising customer loyalty enables ports to achieve a competitive advantage, but also on an assessment that from a defensive marketing point of view, the source of port competitiveness depends more on preventing existing customers from severing relations than creating new clients. The results and suggestions of this study are summarized as follows. First, it has expanded the path of influence by adding customer trust and commitment to the paradigm of port logistics service quality and customer satisfaction, which affects customer loyalty and relation continuity intention. Secondly, safety has been found to have the greatest impact on customer satisfaction, followed by reliability and speediness. Thirdly, an analysis of the impact of service quality factors on trust has shown that safety, which has influenced customer satisfaction the most, has a meaningful effect on customer trust. Fifthly, customer satisfaction has been found have a positive influence on trust and commitment. Fourthly, trust and commitment pertaining to relation quality has been found to have a direct positive impact on relation continuity intention.
우성천(U, Seong-Cheon) 한국화재소방학회 2013 한국화재소방학회 학술대회 논문집 Vol.2013 No.추계
기념일이란 축하하거나 기릴만한 일이 있을 때 해마다 그 일이 있었던 날을 기억하는 날로써 정부가 '각종 기념일등에 관한 규정'에 의거하여 제정, 주관하는 어떤 특정한 날을 기념하는 날을 말한다. 그러나 지난 2012년 11월 9일 제50주년 소방의 날의 역사를 되돌아보면 11월 9일이 과연 소방의 날로서 유의미한 기념일이 될 수 있는가 하는 의문을 제기하면서 소방의 날을 진정 기념일다운 기념일이 될 수 있는 방안을 모색하여 소방공무원과 소방관계자들의 긍지와 보람을 되찾을 수 있는 소방기념일로 재조정하고자 제언하였다. 본 연구에서는 소방기념일 재조정을 위한 의미있는 날들을 살펴보고 소방기념일에 부합되는 기념일을 제시하여 향후 소방관계자들이 기념일로서 타당한 날을 소방기념일로 제정될 수 있도록 제언하는데 그 목적이 있다.