- he is one of the founders (together with M.V. Burlakov) of scientific methodology and engineering technique of numerical optimization of controlled discrete processes of service (DPS) [26];

- he identified, described and theoretically studied the practically important base class of DPS [26];

- he developed several models of DPS numerical optimization which are of practical interest [26];

- he formulated the general principles of creating software tools for synthesis and investigation of the tabular strategies for controlling DPS [27]

- he developed the initial versions of the software modules of input-output data and of automated work places for local and network varieties of two tools for optimizing DTIPs: LIS/NIS GAO (optimization of network planning) and LIS/NIS IO (optimization of standard investments) [16]; many technical solutions, realized by R.A. Rojco in these programs, were used in later versions of various software tools for DTIPs, created by M.V. Burlakov 

- he is initiator, active supporter and leader of a pilot project on realization for the first time in history in Gorlovka Regional Institute of the University "Ukraine" of a new training course on the basics of IT AC DTIP [15], created by M.V. Burlakov