Modeling and solution for the ship stowage planning problem of coils in the steel industry

We consider a ship stowage planning problem where steel coils with known destination ports are to be loaded onto a ship. The coils are to be stowed on the ship in rows. Due to their heavy weight and cylindrical shape, coils can be stowed in at most two levels. Different from stowage problems in previous studies, in this problem there are no fixed positions on the ship for the coils due to their different sizes. At a destination port, if a coil to be unloaded is not at a top position, those blocking it need to be shuffled. In addition, the stability of ship has to be maintained after unloading at each destination port. The objective for the stowage planning problem is to minimize a combination of ship instability throughout the entire voyage, the shuffles needed for unloading at the destination ports, and the dispersion of coils to be unloaded at the same destination port. We formulate the problem as a novel mixed integer linear programming model. Several valid inequalities are derived to help reducing solution time. A tabu search (TS) algorithm is developed for the problem with the initial solution generated using a construction heuristic. To evaluate the proposed TS algorithm, numerical experiments are carried out on problem instances of three different scales by comparing it with a model-based decomposition heuristic, the classic TS algorithm, the particle swarm optimization algorithm, and the manual method used in practice. The results show that for small problems, the proposed algorithm can generate optimal solutions. For medium and large practical problems, the proposed algorithm outperforms other methods

Роль нових форм організації наукових досліджень у підвищенні інноваційного потенціалу НАН України

Здійснено порівняльний аналіз інноваційних розробок учених НАН України, частина яких перевершує показники зарубіжних або не має відповідних аналогів у світі, а також розглянуто значення нових форм організації наукових досліджень. Запропоновано першочергові заходи для підвищення ролі науки в інноваційному розвитку суспільства.Осуществлен сравнительный анализ инновационных разработок ученых НАН Украины, часть которых превосходит показатели зарубежных или не имеет соответствующих аналогов в мире, а также рассмотрено значение новых форм организации научных исследований. Предложены первоочередные меры по повышению роли науки в инновационном развитии общества.The comparative analysis of innovative developments of scientists of NAS of Ukraine, part of which excels foreign indexes or does not have proper analogues in the world is carried out. Value of new forms of scientific researche organization is determined. Primary measures are offered for the increase of science role in innovative development of society

2 XZ spatial acoustic pressure field excited by single-stripe.mp4

XZ spatial acoustic pressure field excited by single-strip

4 XZ spatial acoustic pressure field excited by concentric circles.mp4

XZ spatial acoustic pressure field excited by concentric circle

1 Patterning of multiple silica particles.mp4

Patterning of multiple silica particle

5 Transport of multiple silica particles.mp4

Transport of multiple silica particle

3 XY spatial acoustic pressure field excited by concentric circles.mp4

XY spatial acoustic pressure field excited by concentric circle

Hierarchical trust management framework.

<p>Hierarchical trust management framework.</p

Comparation of convergence speed.

<p>Comparation of convergence speed.</p

Effect of communication range of tag on detection rate of malicious event.

<p>Effect of communication range of tag on detection rate of malicious event.</p