#### Filter Results:

- Full text PDF available (3)

#### Publication Year

2011

2017

#### Publication Type

#### Co-author

#### Publication Venue

#### Key Phrases

Learn More

- Christian Gießen, Carsten Witt
- GECCO
- 2015

The (1+1) EA with mutation probability <i>c/n</i>, where <i>c</i>>0 is an arbitrary constant, is studied for the classical OneMax function. Its expected optimization time is analyzed exactly (up to lower order terms) as a function of <i>c</i> and λ. It turns out that 1/<i>n</i> is the only optimal mutation probability if λ=<i>o</i>(ln <i>n</i>… (More)

- Christian Gießen, Timo Kötzing
- Algorithmica
- 2014

We consider stochastic versions of OneMax and LeadingOnes and analyze the performance of evolutionary algorithms with and without populations on these problems. It is known that the (1+1) EA on OneMax performs well in the presence of very small noise, but poorly for higher noise levels. We extend these results to LeadingOnes and to many different noise… (More)

- S Stintzing, L Fischer von Weikersthal, +16 authors V Heinemann
- British journal of cancer
- 2011

BACKGROUND
The AIO KRK-0104 randomised phase II trial investigated the efficacy and safety of two capecitabine-based regimens: combination of capecitabine and irinotecan (CAPIRI) plus cetuximab (CAPIRI-C) and combination of capecitabine with oxaliplatin (CAPOX) plus cetuximab (CAPOX-C) in the first-line treatment of metastatic colorectal cancer (mCRC).… (More)

- C Giessen, L Fischer von Weikersthal, +5 authors V Heinemann
- British journal of cancer
- 2013

BACKGROUND
Liver-limited disease (LLD) denotes a specific subgroup of metastatic colorectal cancer (mCRC) patients.
PATIENTS AND METHODS
A total of 479 patients with unresectable mCRC from an irinotecan-based randomised phase III trial were evaluated. Patients with LLD and non-LLD and hepatic resection were differentiated. Based on baseline patient… (More)

- Christian Gießen
- GECCO
- 2013

There is empirical evidence that memetic algorithms (MAs) can outperform plain evolutionary algorithms (EAs). Recently the first runtime analyses have been presented proving the aforementioned conjecture rigorously by investigating Variable-Depth Search, VDS for short (Sudholt, 2008). Sudholt raised the question if there are problems where VDS performs… (More)

- Christian Gießen, Carsten Witt
- Algorithmica
- 2016

The ( $$1+\lambda $$ 1 + λ ) EA with mutation probability c / n, where $$c>0$$ c > 0 is an arbitrary constant, is studied for the classical OneMax function. Its expected optimization time is analyzed exactly (up to lower order terms) as a function of c and $$\lambda $$ λ . It turns out that 1 / n is the only optimal mutation probability if $$\lambda =o(\ln… (More)

We propose a new way to self-adjust the mutation rate in population-based evolutionary algorithms. Roughly speaking, it consists of creating half the offspring with a mutation rate that is twice the current mutation rate and the other half with half the current rate. The mutation rate is then updated to the rate used in that subpopulation which contains the… (More)

- Christian Gießen, Carsten Witt
- GECCO
- 2016

We study the (1+λ) EA with mutation probability c/n, where c>0 is a constant, on the OneMax problem. Using an improved variable drift theorem, we show that upper and lower bounds on the expected runtime of the (1+λ) EA obtained from variable drift theorems are at most apart by a small lower order term if the exact drift is known. This reduces… (More)

- ‹
- 1
- ›