Samsung has replaced its head of mobile design, the man who developed its flagship Galaxy S smartphone series, amid criticism of its latest device_and a fresh patent litigation defeat at the hands of rival Apple. Reuters reports that_Chang Dong-hoon tendered his resignation from his position as the head of Samsung Electronics’_mobile design team last week, most likely in response to lukewarm reviews of the design of the Galaxy S5. The_S series has sold over 100 million units and_propelled Samsung_to the top of the global smartphone industry based on market share, but the S5