Ending of shuttle service puts space experiments ‘at risk’

conditional copula-garch methods for value at risk of portfolio: the case of tehran stock exchange market

ارزش در معرض ریسک یکی از مهمترین معیارهای اندازه گیری ریسک در بنگاه های اقتصادی می باشد. برآورد دقیق ارزش در معرض ریسک موضوع بسیارمهمی می باشد و انحراف از آن می تواند موجب ورشکستگی و یا عدم تخصیص بهینه منابع یک بنگاه گردد. هدف اصلی این مطالعه بررسی کارایی روش copula-garch شرطی در برآورد ارزش در معرض ریسک پرتفویی متشکل از دو سهام می باشد و ارزش در معرض ریسک بدست آمده با روشهای سنتی برآورد ارزش د...

Defending Puts the Anterior Cruciate Ligament at Risk During Soccer

BACKGROUND Soccer athletes are at risk for anterior cruciate ligament (ACL) injury. To date, there are limited studies on the mechanisms of ACL injuries in soccer athletes and no video-based analysis or sex-based comparison of these mechanisms. HYPOTHESIS There is no difference in ACL injury mechanisms among soccer athletes by sex. STUDY DESIGN Case series. LEVEL OF EVIDENCE Level 4. ME...

Space Shuttle Technical Conference

Modeling the Space Shuttle

We summarize our methodology for modeling space shuttle processing using discrete event simulation. Why the project was initiated, what the overall goals were, how it was funded, and who were the members of the project team are identified. We describe the flow of the space shuttle flight hardware through the supporting infrastructure and how the model was created to accurately portray the space...

Modeling Space Shuttle Software Failures at Varying Criticality Levels

Regression methods are employed in analyzing a space shuttle software failure data set, classified into three criticality levels. A family of models based on transforms of cumulative time and cumulative failures is considered for the purposes of generating long-term future predictions of the software failure process for any criticality level. This family includes several established software re...