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ORCID老人街头整理一箱硬币 路人抵得上杭州一套豪宅了
Person information
- affiliation: Free University of Berlin, Germany
- affiliation (PhD 1976): Saarland University, Saarbrücken, Germany
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2020 – today
- 2021
[i10]Helmut Alt, Otfried Cheong, Ji-won Park, Nadja Seiferth:
Packing 2D disks into a 3D container. CoRR abs/2110.12711 (2021)- 2020
- [j45]Hee-Kap Ahn
, Helmut Alt, Maike Buchin, Eunjin Oh, Ludmila Scharf, Carola Wenk:
Middle curves based on discrete Fréchet distance. Comput. Geom. 89: 101621 (2020)
2010 – 2019
- 2019
- [c45]Helmut Alt, Otfried Cheong, Ji-won Park, Nadja Scharf:
Packing 2D Disks into a 3D Container. WALCOM 2019: 369-380 - 2018
- [j44]Helmut Alt, Nadja Scharf:
Approximating Smallest Containers for Packing Three-Dimensional Convex Objects. Int. J. Comput. Geom. Appl. 28(2): 111-128 (2018) - [j43]Helmut Alt, Kevin Buchin, Steven Chaplick, Otfried Cheong, Philipp Kindermann, Christian Knauer, Fabian Stehn:
Placing your coins on a shelf. J. Comput. Geom. 9(1): 312-327 (2018) - 2017
- [j42]Helmut Alt, Sergio Cabello, Panos Giannopoulos, Christian Knauer:
Minimum Cell Connection in Line Segment Arrangements. Int. J. Comput. Geom. Appl. 27(3): 159-176 (2017) - [j41]Helmut Alt, Mark de Berg, Christian Knauer:
Approximating Minimum-Area Rectangular and Convex Containers for Packing Convex Polygons. J. Comput. Geom. 8(1): 1-10 (2017) - [c44]Helmut Alt, Kevin Buchin, Steven Chaplick, Otfried Cheong, Philipp Kindermann, Christian Knauer, Fabian Stehn:
Placing your Coins on a Shelf. ISAAC 2017: 4:1-4:12 - [i9]Helmut Alt, Kevin Buchin, Steven Chaplick, Otfried Cheong, Philipp Kindermann, Christian Knauer, Fabian Stehn:
Placing your Coins on a Shelf. CoRR abs/1707.01239 (2017) - 2016
- [j40]Helmut Alt, Michael S. Payne, Jens M. Schmidt, David R. Wood:
Thoughts on Barnette's Conjecture. Australas. J Comb. 64: 354-365 (2016) - [j39]Dongwoo Park, Sang Won Bae, Helmut Alt, Hee-Kap Ahn:
Bundling three convex polygons to minimize area or perimeter. Comput. Geom. 51: 1-14 (2016) - [j38]Helmut Alt:
Computational Aspects of Packing Problems. Bull. EATCS 118 (2016) - [c43]Helmut Alt, Nadja Scharf:
Approximating Smallest Containers for Packing Three-Dimensional Convex Objects. ISAAC 2016: 11:1-11:14 - [c42]Hee-Kap Ahn, Helmut Alt, Maike Buchin, Eunjin Oh, Ludmila Scharf, Carola Wenk:
A Middle Curve Based on Discrete Fréchet Distance. LATIN 2016: 14-26 - [i8]Helmut Alt, Nadja Scharf:
Approximating Smallest Containers for Packing Three-dimensional Convex Objects. CoRR abs/1601.04585 (2016) - 2015
- [c41]Helmut Alt, Mark de Berg, Christian Knauer:
Approximating Minimum-Area Rectangular and Convex Containers for Packing Convex Polygons. ESA 2015: 25-34 - 2014
- [j37]Helmut Alt, Esther M. Arkin, Alon Efrat, George Hart, Ferran Hurtado, Irina Kostitsyna, Alexander Kröller, Joseph S. B. Mitchell, Valentin Polishchuk:
Scandinavian Thins on Top of Cake: New and Improved Algorithms for Stacking and Packing. Theory Comput. Syst. 54(4): 689-714 (2014) - 2013
- [c40]Hee-Kap Ahn, Helmut Alt, Sang Won Bae, Dongwoo Park:
Bundling Three Convex Polygons to Minimize Area or Perimeter. WADS 2013: 13-24 - 2012
- [j36]Helmut Alt, Ludmila Scharf:
Shape matching by random sampling. Theor. Comput. Sci. 442: 2-12 (2012) - [i7]Helmut Alt, Ludmila Scharf:
Computation of the Hausdorff distance between sets of line segments in parallel. CoRR abs/1207.3962 (2012) - 2011
- [p3]Helmut Alt:
Fast Sorting Algorithms. Algorithms Unplugged 2011: 17-25 - [e7]Berthold Vöcking, Helmut Alt, Martin Dietzfelbinger, Rüdiger Reischuk, Christian Scheideler, Heribert Vollmer, Dorothea Wagner:
Algorithms Unplugged. Springer 2011, ISBN 978-3-642-15327-3 [contents] - [i6]Helmut Alt, Sergio Cabello, Panos Giannopoulos, Christian Knauer:
Minimum cell connection and separation in line segment arrangements. CoRR abs/1104.4618 (2011) - 2010
- [j35]Helmut Alt, Ludmila Scharf, Daria Schymura:
Probabilistic matching of planar regions. Comput. Geom. 43(2): 99-114 (2010) - [j34]Helmut Alt, Maike Buchin:
Can We Compute the Similarity between Surfaces? Discret. Comput. Geom. 43(1): 78-99 (2010)
2000 – 2009
- 2009
- [j33]Hee-Kap Ahn, Helmut Alt, Tetsuo Asano, Sang Won Bae, Peter Brass, Otfried Cheong, Christian Knauer, Hyeon-Suk Na, Chan-Su Shin, Alexander Wolff:
Constructing Optimal Highways. Int. J. Found. Comput. Sci. 20(1): 3-23 (2009) - [j32]Helmut Alt, Hans L. Bodlaender, Marc J. van Kreveld, Günter Rote, Gerard Tel:
Wooden Geometric Puzzles: Design and Hardness Proofs. Theory Comput. Syst. 44(2): 160-174 (2009) - [c39]Helmut Alt:
The Computational Geometry of Comparing Shapes. Efficient Algorithms 2009: 235-248 - [c38]Helmut Alt, Ludmila Scharf:
Shape Matching by Random Sampling. WALCOM 2009: 381-393 - [e6]Susanne Albers, Helmut Alt, Stefan Näher:
Efficient Algorithms, Essays Dedicated to Kurt Mehlhorn on the Occasion of His 60th Birthday. Lecture Notes in Computer Science 5760, Springer 2009, ISBN 978-3-642-03455-8 [contents] - [e5]Pankaj Kumar Agarwal, Helmut Alt, Monique Teillaud:
Computational Geometry, 08.03. - 13.03.2009. Dagstuhl Seminar Proceedings 09111, Schloss Dagstuhl - Leibniz-Zentrum für Informatik, Germany 2009 [contents] - [i5]Pankaj Kumar Agarwal, Helmut Alt, Monique Teillaud:
09111 Abstracts Collection - Computational Geometry. Computational Geometry 2009 - [i4]Helmut Alt, Ludmila Scharf, Daria Schymura:
Probabilistic Matching of Planar Regions. CoRR abs/0902.4337 (2009) - 2008
- [j31]Helmut Alt, Ludmila Scharf:
Computing the Hausdorff Distance between Curved Objects. Int. J. Comput. Geom. Appl. 18(4): 307-320 (2008) - [p2]Helmut Alt:
Schnelle Sortieralgorithmen. Taschenbuch der Algorithmen 2008: 21-30 - [e4]Berthold Vöcking, Helmut Alt, Martin Dietzfelbinger, Rüdiger Reischuk, Christian Scheideler, Heribert Vollmer, Dorothea Wagner:
Taschenbuch der Algorithmen. eXamen.press, Springer 2008, ISBN 978-3-540-76393-2 [contents] - 2007
- [c37]Hee-Kap Ahn, Helmut Alt, Tetsuo Asano, Sang Won Bae, Peter Brass, Otfried Cheong, Christian Knauer, Hyeon-Suk Na, Chan-Su Shin, Alexander Wolff:
Constructing Optimal Highways. CATS 2007: 7-14 - [c36]Helmut Alt, Ludmila Scharf, Sven Scholz:
Probabilistic matching and resemblance evaluation of shapes in trademark images. CIVR 2007: 533-540 - [c35]Helmut Alt, Hans L. Bodlaender, Marc J. van Kreveld, Günter Rote, Gerard Tel:
Wooden Geometric Puzzles: Design and Hardness Proofs. FUN 2007: 16-29 - [i3]Helmut Alt, Maike Buchin:
Can we Compute the Similarity Between Surfaces? CoRR abs/cs/0703011 (2007) - [i2]Hee-Kap Ahn, Helmut Alt, Tetsuo Asano, Sang Won Bae, Peter Brass, Otfried Cheong, Christian Knauer, Hyeon-Suk Na, Chan-Su Shin, Alexander Wolff:
Constructing Optimal Highways. CoRR abs/cs/0703037 (2007) - 2006
- [c34]Helmut Alt, Esther M. Arkin, Hervé Brönnimann, Jeff Erickson, Sándor P. Fekete, Christian Knauer, Jonathan Lenchner, Joseph S. B. Mitchell, Kim Whittlesey:
Minimum-cost coverage of point sets by disks. SCG 2006: 449-458 - 2005
- [j30]Helmut Alt, Otfried Cheong, Antoine Vigneron:
The Voronoi Diagram of Curved Objects. Discret. Comput. Geom. 34(3): 439-453 (2005) - [j29]Helmut Alt:
Foreword. Theory Comput. Syst. 38(2): 133 (2005) - [i1]Helmut Alt, Maike Buchin:
Semi-computability of the Fréchet distance between surfaces. EuroCG 2005: 45-48 - 2004
- [j28]Helmut Alt, Christian Knauer, Carola Wenk:
Comparison of Distance Measures for Planar Curves. Algorithmica 38(1): 45-58 (2004) - 2003
- [j27]Helmut Alt, Alon Efrat, Günter Rote, Carola Wenk:
Matching planar maps. J. Algorithms 49(2): 262-283 (2003) - [c33]Helmut Alt, Marc Glisse, Xavier Goaoc:
On the worst-case complexity of the silhouette of a polytope. CCCG 2003: 51-55 - [c32]Helmut Alt, Christian Knauer, Günter Rote, Sue Whitesides:
The complexity of (un)folding. SCG 2003: 164-170 - [c31]Carola Wenk, Helmut Alt, Alon Efrat, Lingeshwaran Palaniappan, Günter Rote:
Finding a curve in a map. SCG 2003: 384-385 - [c30]Helmut Alt, Alon Efrat, Günter Rote, Carola Wenk:
Matching planar maps. SODA 2003: 589-598 - [e3]Helmut Alt, Michel Habib:
STACS 2003, 20th Annual Symposium on Theoretical Aspects of Computer Science, Berlin, Germany, February 27 - March 1, 2003, Proceedings. Lecture Notes in Computer Science 2607, Springer 2003, ISBN 3-540-00623-0 [contents] - 2002
- [e2]Helmut Alt, Afonso Ferreira:
STACS 2002, 19th Annual Symposium on Theoretical Aspects of Computer Science, Antibes - Juan les Pins, France, March 14-16, 2002, Proceedings. Lecture Notes in Computer Science 2285, Springer 2002, ISBN 3-540-43283-3 [contents] - 2001
- [c29]Helmut Alt:
The Nearest Neighbor. Computational Discrete Mathematics 2001: 13-24 - [c28]Helmut Alt, Laura Heinrich-Litan:
Exact Linfty Nearest Neighbor Search in High Dimensions. SCG 2001: 157-163 - [c27]Helmut Alt, Christian Knauer, Carola Wenk:
Matching Polygonal Curves with Respect to the Fréchet Distance. STACS 2001: 63-74 - [e1]Helmut Alt:
Computational Discrete Mathematics, Advanced Lectures. Lecture Notes in Computer Science 2122, Springer 2001, ISBN 3-540-42775-9 [contents] - 2000
- [j26]Helmut Alt, Stefan Felsner, Ferran Hurtado, Marc Noy, Emo Welzl:
A class of point-sets with few k-sets. Comput. Geom. 16(2): 95-101 (2000) - [c26]Helmut Alt, Ferran Hurtado:
Packing Convex Polygons into Rectangular Boxes. JCDCG 2000: 67-80 - [p1]Helmut Alt, Leonidas J. Guibas:
Discrete Geometric Shapes: Matching, Interpolation, and Approximation. Handbook of Computational Geometry 2000: 121-153
1990 – 1999
- 1999
- [j25]Helmut Alt, Ulrich Fuchs, Klaus Kriegel:
On The Number Of Simple Cycles In Planar Graphs. Comb. Probab. Comput. 8(5): 397-405 (1999) - 1998
- [j24]Helmut Alt, Ulrich Fuchs, Günter Rote, Gerald Weber:
Matching Convex Shapes with Respect to the Symmetric Difference. Algorithmica 21(1): 89-103 (1998) - [j23]Helmut Alt, Michael Godau, Sue Whitesides:
Universal 3-dimensional visibility representations for graphs. Comput. Geom. 9(1-2): 111-125 (1998) - [c25]Helmut Alt, Stefan Felsner, Ferran Hurtado, Marc Noy:
Point-Sets with few k-Sets. SCG 1998: 200-205 - 1997
- [j22]Oswin Aichholzer, Helmut Alt, Günter Rote:
Matching Shapes with a Reference Point. Int. J. Comput. Geom. Appl. 7(4): 349-363 (1997) - [c24]Helmut Alt, Emo Welzl, Barbara Wolfers:
Piecewise Linear Approximation of Bézier-Curves. SCG 1997: 433-435 - [c23]Helmut Alt, Ulrich Fuchs, Klaus Kriegel:
On the Number of Simple Cycles in Planar Graphs. WG 1997: 15-24 - 1996
- [j21]Helmut Alt, Leonidas J. Guibas, Kurt Mehlhorn, Richard M. Karp, Avi Wigderson:
A Method for Obtaining Randomized Algorithms with Small Tail Probabilities. Algorithmica 16(4/5): 543-547 (1996) - [c22]Helmut Alt, Ulrich Fuchs, Günter Rote, Gerald Weber:
Matching Convex Shapes with Respect to the Symmetric Difference. ESA 1996: 320-333 - 1995
- [j20]Helmut Alt, Bernd Behrends, Johannes Blömer:
Approximate Matching of Polygonal Shapes. Ann. Math. Artif. Intell. 13(3-4): 251-265 (1995) - [j19]Helmut Alt, Michael Godau:
Computing the Fréchet distance between two polygonal curves. Int. J. Comput. Geom. Appl. 5: 75-91 (1995) - [c21]Helmut Alt, David Hsu, Jack Snoeyink:
Computing the largest inscribed isothetic rectangle. CCCG 1995: 67-72 - [c20]Helmut Alt, Otfried Schwarzkopf:
The Voronoi Diagram of Curved Objects. SCG 1995: 89-97 - [c19]Helmut Alt, Michael Godau, Sue Whitesides:
Universal 3-Dimensional Visibility Representations for Graphs. GD 1995: 8-19 - 1994
- [j18]Gerald Weber, Lars Knipping, Helmut Alt:
An Application of Point Pattern Matching in Astronautics. J. Symb. Comput. 17(4): 321-340 (1994) - [c18]Helmut Alt, Oswin Aichholzer, Günter Rote:
Matching Shapes with a Reference Point. SCG 1994: 85-92 - 1992
- [j17]Helmut Alt, Rudolf Fleischer, Michael Kaufmann, Kurt Mehlhorn, Stefan Näher, Stefan Schirra, Christian Uhrig:
Approximate Motion Planning and the Complexity of the Boundary of the Union of Simple Geometric Figures. Algorithmica 8(5&6): 391-406 (1992) - [j16]Helmut Alt, Viliam Geffert, Kurt Mehlhorn:
A Lower Bound for the Nondeterministic Space Complexity of Context-Free Recognition. Inf. Process. Lett. 42(1): 25-27 (1992) - [c17]Helmut Alt, Michael Godau:
Measuring the Resemblance of Polygonal Curves. SCG 1992: 102-109 - [c16]Helmut Alt, Johannes Blömer:
Resemblance and Symmetries of Geometric Patterns. Data Structures and Efficient Algorithms 1992: 1-24 - 1991
- [j15]Helmut Alt, Norbert Blum, Kurt Mehlhorn, Markus Paul:
Computing a Maximum Cardinality Matching in a Bipartite Graph in Time O(^1.5 sqrt m/log n). Inf. Process. Lett. 37(4): 237-240 (1991) - [c15]Helmut Alt, Bernd Behrends, Johannes Blömer:
Approximate Matching of Polygonal Shapes (Extended Abstract). SCG 1991: 186-193 - 1990
- [c14]Helmut Alt, Rudolf Fleischer, Michael Kaufmann, Kurt Mehlhorn, Stefan Näher, Stefan Schirra, Christian Uhrig:
Approximate Motion Planning and the Complexity of the Boundary of the Union of Simple Geometric Figures. SCG 1990: 281-289 - [c13]Helmut Alt, Johannes Blömer, Hubert Wagener:
Approximation of Convex Polygons. ICALP 1990: 703-716
1980 – 1989
- 1989
- [c12]Chee-Keng Yap, Helmut Alt:
Motion Planning in the CL-Environment (Extended Abstract). WADS 1989: 373-380 - 1988
- [j14]Helmut Alt, Kurt Mehlhorn, Hubert Wagener, Emo Welzl:
Congruence, Similarity, and Symmetries of Geometric Objects. Discret. Comput. Geom. 3: 237-256 (1988) - [j13]Helmut Alt, Hubert Wagener:
Approximation of Polygons by Rechtangles and Circles. Bull. EATCS 36: 103-112 (1988) - [j12]Helmut Alt:
Comparing the combinational complexities of arithmetic functions. J. ACM 35(2): 447-460 (1988) - [j11]Helmut Alt, Emo Welzl:
Visibility graphs and obstacle-avoiding shortest paths. ZOR Methods Model. Oper. Res. 32(3-4): 145-164 (1988) - [j10]Kurt Mehlhorn, Stefan Näher, Helmut Alt:
A Lower Bound on the Complexity of the Union-Split-Find Problem. SIAM J. Comput. 17(6): 1093-1102 (1988) - 1987
- [j9]Helmut Alt, Torben Hagerup, Kurt Mehlhorn, Franco P. Preparata:
Deterministic Simulation of Idealized Parallel Computers on More Realistic Ones. SIAM J. Comput. 16(5): 808-835 (1987) - [c11]Helmut Alt, Kurt Mehlhorn, Hubert Wagener, Emo Welzl:
Congruence, Similarity, and Symmetries of Geometric Objects. SCG 1987: 308-315 - [c10]Kurt Mehlhorn, Stefan Näher, Helmut Alt:
A Lower Bound for the Complexity of the Union-Split-Find Problem. ICALP 1987: 479-488 - [c9]Helmut Alt, Torben Hagerup, Kurt Mehlhorn, Franco P. Preparata:
Deterministic Simulation of Idealized Parallel Computers on more Realistic Ones. Parallel Algorithms and Architectures 1987: 11-15 - 1986
- [c8]Helmut Alt, Torben Hagerup, Kurt Mehlhorn, Franco P. Preparata:
Deterministic Simulation of Idealized Parallel Computers on More Realistic Ones. MFCS 1986: 199-208 - 1985
- [j8]Helmut Alt, Kurt Mehlhorn:
Searching Semisorted Tables. SIAM J. Comput. 14(4): 840-848 (1985) - [j7]Helmut Alt:
Multiplication is the Easiest Nontrivial Arithmetic Function. Theor. Comput. Sci. 36: 333-339 (1985) - 1984
- [j6]Helmut Alt, Kurt Mehlhorn, J. Ian Munro:
Partial Match Retrieval in Implicit Data Structures. Inf. Process. Lett. 19(2): 61-65 (1984) - [c7]Helmut Alt:
Comparison of Arithmetic Functions with Respect to Boolean Circuit Depth (Extended Abstract). STOC 1984: 466-470 - 1983
- [c6]Helmut Alt:
Multiplication Is the Easiest Nontrivial Arithmetic Function. FOCS 1983: 320-322 - 1981
- [j5]Helmut Alt, Jan van Leeuwen:
The complexity of basic complex operations. Computing 27(3): 205-215 (1981) - [c5]Helmut Alt, Kurt Mehlhorn, J. Ian Munro:
Partial Match Retrieval in Implicit Data Structures. MFCS 1981: 156-161 - 1980
- [c4]Helmut Alt:
Functions Equivalent to Integer Multiplication. ICALP 1980: 30-37
1970 – 1979
- 1979
- [j4]Helmut Alt:
Lower Bounds on Space Complexity for Contextfree Recognition. Acta Informatica 12: 33-61 (1979) - [j3]Helmut Alt:
Square rooting is as difficult as multiplication. Computing 21(3): 221-232 (1979) - [j2]Helmut Alt, Kurt Mehlhorn:
Complexity arguments in algebraic language theory. RAIRO Theor. Informatics Appl. 13(3): 217-225 (1979) - [c3]Helmut Alt, Jan van Leeuwen:
The complexity of complex division (extended abstract). FCT 1979: 13-17 - 1977
- [c2]Helmut Alt:
Eine untere Schranke für den Platzbedarf bei der Analyse beschränkter kontextfreier Sprachen. Theoretical Computer Science 1977: 123-131 - 1976
- [b1]Helmut Alt:
Eine untere Schranke für den Platzbedarf bei der Analyse beschränkter kontextfreier Sprachen. Saarland University, Saarbrücken, Germany, 1976, pp. 1-76 - [c1]Helmut Alt, Kurt Mehlhorn:
Lower Bounds for the Space Complexity of Context-Free Recognition. ICALP 1976: 338-354 - 1975
- [j1]Helmut Alt, Kurt Mehlhorn:
A language over a one symbol alphabet requiring only O (log log n) space. SIGACT News 7(4): 31-33 (1975)
Coauthor Index
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