Microsoft Word - Aslanyan1.doc Îǵ»éÝ»ïÇϳÛÇ ¨ ѳßíáÕ³Ï³Ý ï»ËÝÇϳÛÇ Ù³Ã»Ù³ïÇÏ³Ï³Ý Ñ³ñó»ñ 30, 111--122, 2008. 111 ê³Ñٳݳ÷³Ï áõéáõóÇÏáõÃÛ³Ý ïáÙá·ñ³ýdz ¨ ɳ·ñ³ÝÅÛ³Ý Ùáï³ñÏáõÙÝ»ñÇ Ù³ëÇÝ È¨áÝ ²ëɳÝÛ³Ý, гëÙÇÏ ê³Ñ³ÏÛ³Ý, ²ñïÛáÙ Ðáíë»÷Û³Ý ÐÐ ¶²² ÆÝýáñÙ³ïÇϳÛÇ ¨ ³íïáÙ³ï³óÙ³Ý åñáµÉ»ÙÝ»ñÇ ÇÝëïÇïáõï lasl@sci.am hasmik@ipia.sci.am artyom.hovsepyan@gmail.com ²Ù÷á÷áõÙ êáõÛÝ Ñá¹í³ÍáõÙ ¹Çï³ñÏíáõÙ ¿ ¹ÇëÏñ»ï ïáÙá·ñ³ýdzÛÇ ÁݹѳÝáõñ ¹³ëÇ ÙÇ Ù³ëݳíáñ ËݹÇñ, áñÇ ÉáõÍÙ³Ý Ñ³Ù³ñ ³é³ç³ñÏíáõÙ ¿ ȳ·ñ³ÝÅÛ³Ý é»É³ùë³ódzÛÇ íñ³ ÑÇÙÝí³Í ÙÇ Ùáï³íáñ Ù»ÃṠѳٳå³ï³ëË³Ý Íñ³·ñ³ÛÇÝ Çñ³Ï³Ý³óٳٵ: ¶ñ³Ï³ÝáõÃÛáõÝ 1. R. J. Gardner, P. Gritzmann, D. Prangenberg, On the computational complexity of reconstructing lattice sets from their X-rays. Technical Report (970-05012), Techn. Univ. Munchen, fak. f. math, 1997. 2. G. J. Woeginger. The reconstruction of polyominoes from their orthogonal projections. Inform. Process. Lett., 77, pp 225-229, 2001. 3. E. Barcucci, A. Del Lungo, M. Nivat, and R. Pinzani. Reconstructing convex polyominoes from horizontal and vertical projections. Theoret. Comput. Sci., 155, pp. 321-347, 1996. 4. G. Dahl and T. Flatberg. Lagrangian decomposition for reconstructing hv-convex (0, 1) matrices, Report 303, University of Oslo, pp. 1-13, 2002. 5. M. Guignard and S. Kim. Lagrangian decomposition: a model yielding stronger lagrangian bounds. Math. Prog., 39, pp215-228, 1987. 6. À. À. Ñààêÿí, Ãðàäèåíòíûå àëãîðèòìû ñèíòåçà (0,1)-ìàòðèö ñ ðàçëè÷íûìè ñòðîêàìè. ÄÀÍ Àðì ÑÑÐ, LXXXIII, 5, ñòð. 207-209. 1986. 7. H. J. Ryser. Combinatorial properties of matrices of zeros and ones. Canad. J. Math., 9:pp 371-377, 1957. 8. D. Gale. A theorem on flows in networks. Pacific J. Math., 7, pp 1073-1082, 1957. 112 ê³Ñٳݳ÷³Ï áõéáõóÇÏáõÃÛ³Ý ïáÙá·ñ³ýdz ¨ ɳ·ñ³ÝÅÛ³Ý Ùáï³ñÏáõÙÝ»ñÇ Ù³ëÇÝ On Constrained Convexity Tomography and Lagrangean Approximations L. Aslanyan, H. Sahakyan, A. Hovsepyan Abstract In this paper one particular problem of general type of discrete tomography problems is considered and an approximate algorithm for its solution based on Lagrangean relaxation is introduced. A program’s implementation is given as well.