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DO SECTOR RETURNS LEAD THE STOCK MARKET? THE INTERNATIONAL EVIDENCE
Mitchell Ratner,Ilhan Meric,Gulser Meric People&Global Business Association 2006 Global Business and Finance Review Vol.11 No.2
This paper investigates the lead/lag relationship between the returns of a country's stock market index and 10 primary sector index returns. The sample consists of the Group of Seven (G-7) industrialized countries from January 1974 through December 2003. This study documents a statistically significant lead/lag relationship between sector returns and the stock market index returns in all seven countries. No sector is consistently significant across countries. The results of this study support the gradual information diffusion hypothesis: information travels slowly between asset classes.
PORTFOLIO DIVERSIFICATION WITH COUNTRY INDEX FUNDS
Gulser Meric,Mitchell Ratner,Ilhan Meric People&Global Business Association 2008 Global Business and Finance Review Vol.13 No.2
In this paper, we use a novel application of the Capital Assets Pricing Model (CAP M) with country betas to determine if U.S. investors would benefit by adding iShares exchange-traded country index funds into their portfolios. Our findings indicate that U.S. investors would benefit by including any of the 21 iShares country index funds studied in the paper in their portfolios. We also use the Markowitz mean-variance portfolio optimization approach to determine which iShares country index funds can make the greatest contribution to global portfolios. We find that U.S. investors could increase the portfolio return per unit of volatility risk by increasing the foreign investment component in their global portfolios.
정해관,마샤 라트너,로버트 펠드만 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1
망간의 신경독성은 19세기 초 이래 널리 알려져 왔다. 고전적 망간중독은 파킨스증후 군을 유발하나 그 임상적 양상이 파킨슨병과는 명확하게 구별된다는 점이 인정되고 있다. 그러나 최근 들어 망간 노출 농도가 낮아지는 반면 노출인구는 증가하면서 저농도 노출에 의한 신경장해의 범위에 대해서 논란이 있어왔다. 특히 인구 노령화에 따른 각종 신경퇴행성 질환과는 구별도 필요하게 되었다. 저자들은 최근까지 보고된 직업적, 비직업적 망간 노출인구에서의 건강장해에 대한 임상적, 역학적 연구들을 비교 분석하여 망간 노출에 따른 신경장해를 다음과 같은 5가지 범주로 구분하였는데, 이들은 만성 망간중독, 파킨슨병, 추체외로증후군, 임상전 단계 및 변형증후군 등이다. 이와 같은 임상적 구분은 망간 독성의 병태생리를 이해하는데 도움을 줄뿐 아니라 직업적 및 비직업적 망간노출을 평가하는데도 유용한 도구로 사용될 수 있을 것이다. Neurotoxicity of manganese is known since the report of manganism in early 19th century. However, there are controversies on the range of the clinical manifestation of manganese exposure, especially after the introduction of magnetic resonance imaging on the exposure assessment of manganese exposure. The authors categorized various clinical syndromes of neurologic disorders, which are suggested to be related to occupational or non-occupational manganese exposure, into five stages; chronic manganism, Parkinson's disease, extrapyramidal syndrome, subclinical stage, and variant cases. This categorization will be useful in understanding the pathophysiology of the manganese toxicity and could be utilized in assessment of occupational and non-occupational manganese exposure.
Jack M. Qian,John M. Stahl,Melissa R. Young,Elena Ratner,Shari Damast 대한부인종양학회 2017 Journal of Gynecologic Oncology Vol.28 No.6
Objective: To examine the outcomes (tolerability, toxicity, and recurrence) of vaginalbrachytherapy (VBT) among endometrial cancer (EC) patients treated with small cylinder size. Methods: Patients with EC who received adjuvant VBT between September 2011 andDecember 2015 were reviewed. Patients were fitted with the largest vaginal cylinder theycould comfortably accommodate, from 2.0–3.0 cm diameter. Small cylinders were defined assize 2.3 cm or less. Patient, tumor, or treatment characteristics were correlated with need forsmall cylinders. Treatment tolerability, measures of gastrointestinal (GI), genitourinary (GU),and vaginal toxicity, and rates of recurrence were analyzed. Results: Three hundred four patients were included. Small cylinders were used in 51 patients(17%). Normal body mass index (BMI; p<0.001), nulligravidity (p<0.001), and shorter vaginallength (p<0.001) were associated with small cylinder size. There was no acute or late grade 3toxicity. Rates of acute (grade 1–2) GI, GU, or vaginal symptoms were low (10%, 11%, and 19%,respectively). Small cylinder size was associated with increased likelihood of reporting acuteGI (p<0.05) but not GU or vaginal symptoms. Small cylinder size was associated with higherrisk of grade 1–2 vaginal stenosis (odds ratio [OR]=4.7; 95% confidence interval [CI]=1.5–14.7;p=0.007). There was no association between cylinder size and recurrence rate (p=0.55). Conclusion: VBT is generally very well tolerated, however, patients fitted with smallercylinders (commonly nulligravid and low BMI) may have increased side effects. Further studyto improve the dosimetry of VBT for patients requiring small cylinders may be worthwhile.
Li, Zhihai,Smeu, Manuel,Park, Tae-Hong,Rawson, Jeff,Xing, Yangjun,Therien, Michael J.,Ratner, Mark A.,Borguet, Eric American Chemical Society 2014 NANO LETTERS Vol.14 No.10
<P>Single molecule break junction experiments and nonequilibrium Green’s function calculations using density functional theory (NEGF-DFT) of carbodithioate- and thiol-terminated [5,15-bis(phenylethynyl)-10,20-diarylporphinato]zinc(II) complexes reveal the impact of the electrode-linker coordination mode on charge transport at the single-molecule level. Replacement of thiolate (−S<SUP>–</SUP>) by the carbodithioate (−CS<SUB>2</SUB><SUP>–</SUP>) anchoring motif leads to an order of magnitude increase of single molecule conductance. In contrast to thiolate-terminated structures, metal–molecule–metal junctions that exploit the carbodithioate linker manifest three distinct conductance values. We hypothesize that the magnitudes of these conductances depend upon carbodithoate linker hapticity with measured conductances across Au-[5,15-bis(4′-(dithiocarboxylate)phenylethynyl)-10,20-diarylporphinato]zinc(II)-Au junctions the greatest when both anchoring groups attach to the metal surface in a bidentate fashion. We support this hypothesis with NEGF-DFT calculations, which consider the electron transport properties for specific binding geometries. These results provide new insights into the origin of molecule-to-molecule conductance heterogeneity in molecular charge transport measurements and the factors that optimize electrode–molecule–electrode electronic coupling and maximize the conductance for charge transport.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-10/nl502466a/production/images/medium/nl-2014-02466a_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl502466a'>ACS Electronic Supporting Info</A></P>