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RISS 인기검색어
- 검색키워드
- 저자 : Albert Yeung (검색결과 4 건)
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Yeung, Paul K. H.,Kong, Albert K. H.,Tam, P. H. Thomas,Hui, C. Y.,Takata, Jumpei,Cheng, K. S. American Astronomical Society 2017 The Astrophysical journal Vol.837 No.1
<P>The supernova remnant (SNR) Kes 73 and/or the magnetar 1E 1841-045 at its center can deposit a large amount of energy to the surroundings and is potentially responsible for particle acceleration. Using the data taken with the Fermi Large Area Telescope (LAT), we confirmed the presence of an extended source whose centroid position is highly consistent with this magnetar/SNR pair. Its emission is intense from 100 MeV to > 100 GeV. Its LAT spectrum can be decoupled into two components, which are respectively governed by two different mechanisms. According to the young age of this system, the magnetar is seemingly a necessary and sufficient source for the downward-curved spectrum below 10 GeV, as the observed < 10 GeV flux is too high for the SNR to account for. On the other hand, the SNR is reasonably responsible for the hard spectrum above 10 GeV. Further studies of this region in the TeV regime is required. so that we can perform physically meaningful comparisons of the > 10 GeV spectrum and the TeV spectrum.</P>
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STUDYING THE SGR 1806-20/Cl* 1806-20 REGION USING THE<i>FERMI</i>LARGE AREA TELESCOPE
Yeung, Paul K. H.,Kong, Albert K. H.,Tam, P. H. Thomas,Lin, Lupin C. C.,Hui, C. Y.,Hu, Chin-Ping,Cheng, K. S. American Astronomical Society 2016 The Astrophysical journal Vol.827 No.1
<P>The region around SGR 1806-20 and its host stellar cluster Cl* 1806-20 is a potentially important site of particle acceleration. The soft gamma-ray repeater and Cl* 1806-20, which also contains several very massive stars including a luminous blue variable hypergiant LBV 1806-20, are capable of depositing a large amount of energy to the surroundings. Using the data taken with the Fermi Large Area Telescope (LAT), we identified an extended LAT source to the southwest of Cl* 1806-20. The centroid of the 1-50 GeV emission is consistent with that of HESS J1808-204 (until now unidentified). The LAT spectrum is best-fit by a broken power law with the break energy E-b = 297 +/- 15 MeV. The index above E-b is 2.60 +/- 0.04 and is consistent with the flux and spectral index above 100 GeV for HESS J1808-204, suggesting an association between the two sources. Meanwhile, the interacting supernova remnant SNR G9.7-0.0 is also a potential contributor to the LAT flux. A tentative flux enhancement at the MeV band during a 45 day interval (2011 January 21-March 7) is also reported. We discuss possible origins of the extended LAT source in the context of both leptonic and hadronic scenarios.</P>
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Health and well-being benefits of spending time in forests: systematic review
Oh, Byeongsang,Lee, Kyung Ju,Zaslawski, Chris,Yeung, Albert,Rosenthal, David,Larkey, Linda,Back, Michael Japanese Society for Hygiene 2017 Environmental health and preventive medicine.['97. Vol.22 No.-
<P><B>Background</B></P><P>Numerous studies have reported that spending time in nature is associated with the improvement of various health outcomes and well-being. This review evaluated the physical and psychological benefits of a specific type of exposure to nature, forest therapy.</P><P><B>Method</B></P><P>A literature search was carried out using MEDLINE, PubMed, ScienceDirect, EMBASE, and ProQuest databases and manual searches from inception up to December 2016. Key words: “Forest” or “Shinrin -Yoku” or “Forest bath” AND “Health” or “Wellbeing”. The methodological quality of each randomized controlled trials (RCTs) was assessed according to the Cochrane risk of bias (ROB) tool.</P><P><B>Results</B></P><P>Six RCTs met the inclusion criteria. Participants’ ages ranged from 20 to 79 years. Sample size ranged from 18 to 99. Populations studied varied from young healthy university students to elderly people with chronic disease. Studies reported the positive impact of forest therapy on hypertension (<I>n</I> = 2), cardiac and pulmonary function (<I>n</I> = 1), immune function (<I>n</I> = 2), inflammation (<I>n</I> = 3), oxidative stress (<I>n</I> = 1), stress (<I>n</I> = 1), stress hormone (<I>n</I> = 1), anxiety (<I>n</I> = 1), depression (<I>n</I> = 2), and emotional response (<I>n</I> = 3). The quality of all studies included in this review had a high ROB.</P><P><B>Conclusion</B></P><P>Forest therapy may play an important role in health promotion and disease prevention. However, the lack of high-quality studies limits the strength of results, rendering the evidence insufficient to establish clinical practice guidelines for its use. More robust RCTs are warranted.</P>
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Woojae Myung,HongHee Won,Maurizio Fava,David Mischoulon,Albert Yeung,Dongsoo Lee,DohKwan Kim,HongJin Jeon 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.2
Objective-Although evidence suggests that there is an increase in suicide rates in the general population following celebrity suicide, the rates are heterogeneous across celebrities and countries. It is unclear which is the more vulnerable population according to the effect sizes of celebrity suicides to general population. Methods-All suicide victims in the general population verified by the Korea National Statistical Office and suicides of celebrity in South Korea were included for 7 years from 2005 to 2011. Effect sizes were estimated by comparing rates of suicide in the population one month before and after each celebrity suicide. The associations between suicide victims and celebrities were examined. Results-Among 94,845 suicide victims, 17,209 completed suicide within one month after 13 celebrity suicides. Multivariate logistic regression analyses revealed that suicide victims who died after celebrity suicide were significantly likely to be of age 20–39, female, and to die by hanging. These qualities were more strongly associated among those who followed celebrity suicide with intermediate and high effect sizes than lower. Younger suicide victims were significantly associated with higher effect size, female gender, white collar employment, unmarried status, higher education, death by hanging, and night-time death. Characteristics of celebrities were significantly associated with those of general population in hanging method and gender. Conclusion-Individuals who commit suicide after a celebrity suicide are likely to be younger, female, and prefer hanging as method of suicide, which are more strongly associated in higher effect sizes of celebrity suicide.
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