"where at the same time" is correct and usable in written English.
It is used to indicate that two events (or two situations) are occurring concurrently. For example, "We are expanding our international presence in order to increase our customer base, where at the same time we are focusing on developing a new product line."
Meanwhile, Dallas was where the bluesman Freddie King lived and held court at the clubs, and where, at the same time, the Vaughan brothers, Stevie Ray and Jimmie, cut their teeth before moving to Austin.
But one potentially important area of divergence is among the least noticed: the Middle East conflict, where Europe and America have sharp differences and where, at the same time, Europe may be set to play an increasingly prominent part.
And where better to try it out than at work, where at the same time as finding new outfits for the office you can get to know your colleagues better.
And sometimes a balance is found, where image can freely engender image and where at the same time you are able to keep your sights on the place where the characters are silent and in hiding.
The pitched angle at the top came to Phillips after walking the banked turns at the Daytona racetrack, where, at the same time that Judd was setting up his practice in Marfa, Richard Petty was winning the Daytona 500 in a Dodge Charger.
These schools are reflective of many in Westchester County, where students, teachers and administrators are working to make schools safer and more welcoming for homosexual students, but where, at the same time, classrooms and hallways remain threatening and dangerous places for gay and lesbian teenagers.
Its perfect execution so impressed Peter Behrens, then Germany's most progressive architect, that he offered the 21-year-old Mies a job in his office, where, at about the same time, Walter Gropius and Le Corbusier were also just starting out.
And, like some Surrealist painters, Koolhaas has the genius to make us forget where we are and know where we are at the same time.
Where teams compete individually, each team is given 60 seconds; occasional games where teams compete at the same time are either untimed (with the first team to complete the game winning) or played in 90 seconds.
But if that's not enough for you then you have the option of extending the walk by continuing along the signed Coleridge Way to Alfoxton, where Wordsworth lived at the same time.
The NLMF model considers the case, where the prices at the same time can be iteratively adapted for the strategies in terms of SUs' requested spectrum size, respectively.
