Optimal Investment Horizons for Stocks and Markets

Optimal migration promotes the outbreak of cooperation in heterogeneous populations

Optimal Paths in Complex Networks with Correlated Weights: The World-wide Airport Network

Optimal ranking in networks with community structure

Optimal Resource Allocation in Random Networks with Transportation Bandwidths

Optimal supply against fluctuating demand

Optimal Traffic Networks

Optimal transport on wireless networks

Optimization in task--completion networks

Optimization of hierarchical structures of information flow

Optimization of transport protocols with path-length constraints in complex networks

Optimized network clustering by jumping sub-optimal dendrograms

Optimized reduction of uncertainty in bursty human dynamics

Optimizing and controlling functions of complex networks by manipulating rich-club connections

Optimizing evacuation flow in a two-channel exclusion process

Order preservation in a generalized version of Krause's opinion dynamics model

Order-disorder phase transition in a cliquey social network

Ordered community structure in networks

Ordering dynamics with two non-excluding options: Bilingualism in language competition

Ordering in bidirectional pedestrian flows and its influence on the fundamental diagram