SOUTH PORTLAND — More than a year after a one-way section of Ocean Street became the focus of controversy in the up-and-coming Knightville neighborhood, frustrated residents are pressing for faster action by city officials. In the last year, a traffic committee was formed, meetings were held and studies were done, but residents and business owners remain divided over parking and traffic issues related to the one-block, northbound stretch between E and D streets. The one-way section was established three years ago as part of a larger road and sewerage improvement project.