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500 Solutions

No problem is ever permanently closed. The editor is always pleased to consider for publication new solutions or new insights o n p a s t p r oblems. (1) Determine the set of all c > 0 such that whenever (1) holds, then we have x + y + z xy + yz+ zx. The positive r eals c asked for are those satisfying c 4. From (1), we have xy < c and z = c ; xy x + y + xy. Substituting this value of z into th...

App Crawler: Opening Mobile App Black Boxes

1 MOTIVATION A June 2011 report1 showed that on average, a U.S. smartphone user spent 9% more time using apps (on smartphone) than browsing the Internet (on PC or smartphone). This growth in app usage is fueled by an increasingly large number of diverse and useful mobile apps: there are more than a million mobile apps available today in major app markets and around 15,000 apps are released per ...

Erfolgreiches Lernen durch gamifiziertes E-Learning

E-Learning ist schon länger als Lernmethode für Faktenwissen etabliert. Der Erfolg hängt jedoch von der Wiederholung und der Motivation des Nutzers ab. Gamifiziertes E-Learning hat den Anspruch genau diese Lücke zwischen Motivation und E-Learning zu schließen und die Lernleistung in Bezug auf Geschwindigkeit und Dauerhaftigkeit des Wissens zu erhöhen. Dazu wird ein Konzept entworfen, welches di...

500 [پانصد] خودنگاره

Mol081083 490..500

Membrane transporter proteins may influence the sensitivity of cancer cells to anticancer drugs that can be recognized as substrates. The purpose of this study was to identify proteins that play a key role in the drug sensitivity of stomach and breast cancer cell lines by measuring the absolute protein expression levels of multiple transporters and other membrane proteins and examining their co...