Paweł Sitek

• PhD DSc
• Professor (Associate) at Kielce University of Technology

The classic approach to production control optimization usually comes down to building optimization and decision-making models based on data obtained directly from the production system from the so-called “technological layer”. Most often, economic factors that occur mainly at the level of the so-called „business layer”, which have a significant im...

To implement IT, business, educational, scientific, etc. projects, it is required to have a team of employees with specific competences. A very important aspect is also to guarantee the availability of these employees during the implementation of individual stages of the project. From the point of view of project management, it is crucial to provid...

This editorial presents a summary of the Special Issue on Artificial Intelligence Solutions and Applications for Distributed Systems in Smart Spaces, presented in the “Computer Science & Engineering” section of Electronics (ISSN 2079-9292) [...]

One of the most important aspects of work planning at the production system level is the contract negotiation process. In this process, it is necessary to negotiate the production volume as well as lead time acceptable to both the production system and the customer. Failure to obtain sufficiently accurate forecasts regarding order volume and task c...

Production optimization is a complex process because it must take into account various resources of the company and its environment. In this process, it is necessary to consider the enterprise as a whole, taking into account the interaction between its key elements, both in the technological and business layer. For this reason, the article proposes...

Production planning is a difficult and very complex issue; therefore, it is necessary to consider the enterprise as a whole, taking into account the relations between its elements. The paper presents the application of corporate architecture supported by constraint logic programming and mathematical programming to plan production processes as well...

The paper presents a concept that allows to identify and locate elements of the production process, the optimization of which affects the quality of the entire process. The developed concept is based on an efficient information exchange mechanism between the business layer and the technological layer through the use of enterprise architecture and p...

The paper presents a method of automated modelling and performance evaluation of concurrent production flows carried out in Flexible Manufacturing Systems. The method allows for quick assessment of various variants of such systems, considering their structure and the organization of production flow of possible ways of their implementation. Its esse...

The paper proposes a model of management and configuration of competences of a team conducting advanced training in the field of IT, electronics, robotics and other advanced technologies. The model enables decision support in managing the training team and finding answers to numerous questions in this area. The most important questions include: Doe...

Unmanned aerial vehicles (UAVs), also known as drones, are increasingly common and popular due to their relatively low prices and high mobility. The number of areas for their practical applications is rapidly growing. The most promising are: last-mile delivery, emergency response, the inspection of technical devices and installations, etc. In these...

Smart-city management systems use information about the environment, including the current values of weather factors. The specificity of the urban sites requires a high density of weather measurement points, which forces the use of low-cost sensors. A typical problem of devices using low-cost sensors is the lack of legalization of the sensors and t...

Modern technologies in the field of automation, robotics and IT have significantly changed the face of modern production systems. In particular, the use of AVG, PLC, mobile robots, RFID, IoT, etc. results in modern production processes being characterized by, among others, shortened production cycles and supply chains, reduced production costs, inc...

At the time of commonplace automation, robotization and the rapid development of IT, high qualifications of employees have become the critical element of every industry system. This follows from their limited availability, frequently high costs of procurement and possible employee absenteeism. Moreover, the concept of Industry 4.0 will transform cu...

Modern supply chains require increasingly innovative solutions in organization, management and applied new technology. This includes the introduction of multimodal and intermodal transport as well as e-mobility, drones, etc. Support for modern logistics solutions requires diverse and dedicated employee competences, which must be constantly develope...

The article presents and discusses the issues related to the area of production process management in terms of enterprise corporate architecture to increase the volume and efficiency of production processes. The enterprise architecture also defines the parameters of the technological process and also enables the management of a complex set of auxil...

Modern technologies in the field of automation, robotics and IT play an increasingly important role in modern production systems. Most often they are mobile robots, AGV, PLC, IoT, RFID, cloud computing, etc. Their use results in shortening the production cycles and supply chains, lowering production costs, increasing the quality and reliability of...

One of the elements of the modern trade and services market is a business chain solution (chain store/retail chain). An example of a business chain is, e.g., a restaurant chain, where each restaurant in the chain has the same decor, organization, menu, and delivery method. Although such solutions have been known for decades, the rapid development o...

In today’s competitive knowledge-based economy, the introduction of new solutions, i.e. new products and services, new technologies, new organizational structures, etc., most often requires a project approach. Due to constrained resources, tight deadlines and, usually, a large number of implemented projects, the multi-project environment is used in...

In the age of economics and knowledge-based economy, the competences of enterprises and organizations focus on the competences of their employees. It is especially visible in enterprises using advanced IT technologies and modern communication channels, such as social media. In recent years, social media has become an indispensable and very common c...

Nowadays, we are observing a rapid development of UAV-based monitoring systems, which are faced with more and more new tasks, such as high temporal resolution and high spatial resolution of measurements, or Artificial Intelligence on board. This paper presents the open universal framework intended for fast prototyping or building a short series of...

In modern knowledge-based economy most of new undertakings are accomplished in the form of projects. The critical elements in project management used to be resources and time. Due to continuous technological development of automation, robotization and IT, the access to the resources ceases to be the key issue. Nevertheless, the employees with speci...

The pizza chain is one of the examples of modern chain business. Each of the pizza parlors in the chain has the same decor, organization, menu and take-away delivery method. Such chains usually cover large urban agglomerations. In the era of universal access to the Internet and mobile devices, most customers order pizzas on-line (via an application...

This volume constitutes the refereed proceedings of the 13th Asian Conference on Intelligent Information and Database Systems, ACIIDS 2021, held in Phuket, Thailand, in April 2021. The total of 35 full papers accepted for publication in these proceedings were carefully reviewed and selected from 291 submissions. The papers are organized in the fol...

Modern manufacturing systems are characterized by a high degree of automation and robotization as well as saturation with IT technologies such as IoT, Cloud Computing, RFID, etc. This results in shortening both production cycles and supply chains. It also means that the classic approach to resources as well as planning and scheduling processes has...

Healthcare management, in particular managing a hospital network, is a complex issue which requires taking into account the morbidity process dynamics, simultaneous administration of various therapies, preventive actions, drug supply and responding to emergencies, such as mass casualty traffic incidents, pandemics (e.g. SARS, MERS), etc. The overal...

In this paper, the optimization of Capacitated Vehicle Routing Problem with Alternative Delivery, Pick-up and Time windows is considered. The development of this problem was motivated by analysis of postal and courier delivery issues. In some generalization, the problem examined can be classified as a combination of many variants of the classical V...

IT projects are characterized by high complexity, implementation of the latest technological solutions and specialized competence of contractors and high costs. The key element in IT project management is to have employees with appropriate substantive competencies (programmers, designers, analysts, etc.). Before starting an IT project, the IT proje...

Many problems occurring in production, transport, supply chains and everyday life problems can be formulated in the form of constraint optimization problems (COPs). Most often these are issues related to planning and scheduling, distribution of resources, fleet selection, route and network optimization, configuration of machines and manufacturing s...

The Capacitated Vehicle Routing Problem with Pick-up, Alternative Delivery and Time Windows (CVRPPADTW) is discussed in the paper. The development of this problem was motivated by postal items distribution issues. In some approximation, one can say that the problem under consideration is a combination of many variants of the classical VRP, such as...

To ensure proper functioning of an organization (e.g. production system) in settings in which there exists a risk of disruptions caused by unexpected employee absenteeism and/or a changing demand for employees with specific qualifications, one must move away from traditional approaches oriented towards the determination of procedures for generating...

This volume constitutes the refereed proceedings of the 12th Asian Conference on Intelligent Information and Database Systems, ACIIDS 2020, held in Phuket, Thailand, in March 2020. The total of 50 full papers accepted for publication in these proceedings were carefully reviewed and selected from 180 submissions. The papers of the first volume are...

The paper presents the problem of material requirements planning with optimization of load distribution between work centers and workers’ groups. Moreover, it discusses the computational example for shop orders optimization. The data for this example were taken from the relational database. The method of Constraint Logic Programming (CLP) for shop...

The resource constrained portfolio scheduling problem (RCPoSP), in which orders are grouped in portfolios, is proposed in this study. In the RCPoSP the objective is to deliver all orders in the portfolio at the same time after processing. This problem finds many applications in industrial services, manufacturing companies and, where all items (prod...

The Capacitated Vehicle Routing Problem with Drones (CVRPD) is caused by the increasing interest in commercial drone delivery by many logistic companies (Amazon, DHL, etc.). Our proposition is a binary integer linear programming (BILP) model with objective function which minimizes the distance covered by drones. In our model, we consider the parcel...

The paper presents an optimization model and its implementation using a hybrid approach for the Capacitated Vehicle Routing Problem with Pick-up and Alternative Delivery (CVRPPAD). The development of the CVRPPAD was motivated by postal items distribution issues. The model proposed combines various features of Vehicle Routing Problem variants. The n...

The food sector is a very complex environment influenced by economics, business, industrial, technological, transportation, information, legal and other factors. These factors shape the level of the availability of food, the nature of food products and the delivery method. The efficient and timely distribution of food products is critical for suppo...

Manufacturing enterprises today have to face the volatility of markets, characterized by a decreasing production volume and an increasing number of product variants to meet customer expectations. Traditional dedicated manufacturing lines (DML) have been replaced by flexible manufacturing systems (FMS) and, recently, by the systems that combine feat...

Scheduling and resource allocation problems are widespread in many areas of today's technology and management. Their di®erent forms and structures appear in production, logistics, software engineering, computer networks, project and human resources management, services, etc. The literature (problem classi¯cation, scheduling and resource allocation...

This paper presents a universal model transformation method for the problem which is represented in the form of facts. This method is the key element of the hybrid approach. In this approach, two environments of constraint logic programming (CLP) and mathematical programming (MP) were integrated and hybridized. Hybrid approach is very effective met...

The efficient and timely distribution of freight is critical for supporting the demands of modern urban areas. Without optimal freight distribution, urban areas could not survive and develop. The paper presents the concepts of hybrid approach to optimization of urban freight distribution. This approach proposed combines the strengths of mathematica...

Constraints, although ubiquitous in production and distribution planning, scheduling and control, often lead to inconsistencies in the decision-making process. The constraint-based modeling helps circumvent many organization-impacting issues. To address this, we developed a multi-level approach to the modeling and solving of combinatorial optimizat...

Constrained scheduling problems are quite common in project management, manufacturing, distribution, transportation, logistics, supply chain management, software engineering, and computer networks etc. The need to use integer and binary decision variables representing the allocation of different resources to many activities and numerous specific, u...

The 14th International Symposium on Distributed Computing and Artificial Intelligence 2017 (DCAI 2017) provided a forum for presenting the application of innovative techniques to study and solve complex problems. The exchange of ideas between scientists and technicians from both the academic and industrial sector is essential to advancing the devel...

Purpose The purpose of this paper is the need to build a novel approach that would allow flexible modeling and solving of food supply chain management (FSCM) problems. The models developed would use the data (data-driven modeling) as early as possible at the modeling phase, which would lead to a better and more realistic representation of the probl...

Resource-constrained scheduling problems appear at different levels of decisions in logistics, manufacturing, computer networks, software engineering etc. They are usually characterized by many types of constraints and decision variables which often make them difficult to solve (NP-complete). In addition, these problems are often characterized by t...

Constrained scheduling problems are common in everyday life and especially in: distribution, manufacturing, project management, logistics, supply chain management, software engineering, computer networks etc. A large number of integer and binary decision variables representing the allocation of different constrained resources to activities/jobs and...

Constrained scheduling problems are common in manufacturing, project management, transportation, supply chain management, software engineering, computer networks etc. Multiple binary and integer decision variables representing the allocation of resources to activities and numerous specific constraints on these variables are typical components of th...

Erratum to: S. Omatu et al. (eds.), Distributed Computing and Artificial Intelligence, 13th International Conference, Advances in Intelligent Systems and Computing DOI: 10. 1007/ 978-3-319-40162-1 In the original version, the volume editor’s name was misspelled in the copyright page. The correct name is Ali Selamat

Supply chain problems cover several aspects at different levels and areas. There are decision on production allocation, resource allocation, production and inventory quantities, distributor selection, choice of transportation mode etc. There are many constraints in the supply chain problems. They concern the following areas (production, distributio...

Resource-constrained scheduling problems are commonly found in various areas, such as project management, manufacturing, transportation, software engineering, computer networks, and supply chain management. Its problem models involve a large number of constraints and discrete decision variables, including binary and integer. In effect, the represen...

Multi-echelon distribution systems are quite common in supply-chain and city logistic systems. The paper presents a concept of extending functionality of the multi-distribution models by introduction logical constraints. This is possible by using a hybrid approach to modeling and optimization the multi-echelon problems. In the hybrid approach, two...

Many real-life problems in Supply Chain (SC) are over-constrained. Insufficient resources and time requirements result in an inability to all constraints. In some cases, their fulfillment requires very intensive computing. One way to overcome these difficulties is to soften some of the constraints. Natural environment for the modeling and solving o...

This paper proposes a hybrid programming framework for modeling and solving of constraint satisfaction problems (CSPs) and constraint optimization problems (COPs). Two paradigms, CLP (constraint logic programming) and MP (mathematical programming), are integrated in the framework. The integration is supplemented with the original method of problem...

This paper presents a hybrid method for modeling and solving supply chain optimization problems with soft, hard, and logical constraints.Ability to implement soft and logical constraints is a very important functionality for supply chain optimizationmodels. Such constraints are particularly useful for modeling problems resulting from commercial agr...

The 13th International Symposium on Distributed Computing and Artificial Intelligence 2016 (DCAI 2016) is a forum to present applications of innovative techniques for studying and solving complex problems. The exchange of ideas between scientists and technicians from both the academic and industrial sector is essential to facilitate the development...

This study deals with decision support system and optimization of parallel handling of groups of jobs. All jobs in a group should be delivered at the same time after processing. The authors present a novel hybrid approach, which includes the modelling of the problem in the integrated environment, composed of MP (Mathematical Programming) and CLP (C...

The paper presents a concept and implementation of a novel hybrid approach to the modelling, solving and optimization of the constrained decision problems. Two environments, mathematical programming (MP) and constraint programming (CP), in which constraints are treated in different ways and different methods are implemented, were combined to use th...

Resource-constrained scheduling problems appear frequently at different levels of decisions in manufacturing, logistics, computer networks, software engineering etc. They are usually characterized by many types of constraints, which often make them unstructured and difficult to solve (NP-complete). Traditional mathematical programming (MP) approach...

The paper presents the concept of a declarative approach to decision support for sustainable supply chain (SSC) problems. This approach proposed here combines the strengths of mathematical programming (MP) and constraint logic programming (CLP), which leads to a significant reduction in the search time necessary to find the solution, and allows sol...

This paper describes the hybrid approach to optimization of decision problems in supply chain management (SCM). The hybrid approach proposed here combines the strengths of mathematical programming (MP) and constraint logic programming (CLP), which leads to a significant reduction in the search time necessary to find the optimal solution, and allows...

This paper describes the hybrid framework for the modelling and optimisation of decision problems in sustainable supply chain management. The constraint-based environments used so far to model and solve the decision-making problems have turned out to be ineffective in cases where a number of interbound variables are added up in multiple constraints...

In freight transportation there are two main distribution strategies: direct shipping and multiechelon distribution. In the direct shipping, vehicles, starting from a depot, bring their freight directly to the destination, while in the multiechelon systems, freight is delivered from the depot to the customers through an intermediate points. Multiec...

This paper describes the hybrid approach to optimization of decision problems in sustainable supply chain (SSC). The hybrid approach proposed here combines the strengths of mathematical programming (MP) and constraint logic programming (CLP), which leads to a significant reduction in the search time necessary to find the optimal solution, and allow...

The paper presents a concept and application of a hybrid multi-agent approach to modeling and optimization the supply chain problems. Two environments (mathematical programming (MP) and constraint logic programming (CLP)) and two types of agents were integrated. This integration and hybridization, complemented with an adequate transformation of the...

The paper presents a concept and implementation of a novel hybrid approach to the modelling, optimization and analysis of the supply chain problems. Two environments, mathematical programming (MP) and constraint programming (CP), in which constraints are treated in different ways and different methods are implemented, were combined to use the stren...

This chapter presents the two-phase decision support concepts in automotive supply chain. The proposed concept applied two environments-mathematical programming (operation research approach) and constraint logic programming (declarative approach). We present an approach that allows modeling and solution of the same decision making model in both env...

The paper presents a concept and application of a multi-agent approach to modeling and optimization the Multi-Echelon Capacitated Vehicle Routing Problem. Two environments (mathematical programming (MP) and constraint logic programming (CLP)) and two types of agents were integrated. The strengths of MP and CLP, in which constraints are treated in a...

The paper presents a concept and implementation of a novel approach to the modelling and solving of the Two-Echelon Capacitated Vehicle Routing Problem (2E-CVRP). Multi-echelon distribution systems are quite common in supply-chain and logistic systems. Two environments, mathematical programming (MP) and constraint logic programming, in which constr...

The paper presents a concept and the outline of the implementation of a hybrid approach to modelling and solving constrained problems. Two environments of mathematical programming (in particular, integer programming) and declarative programming (in particular, constraint logic programming) were integrated. The strengths of integer programming and c...

The paper presents application and implementation aspects of a hybrid approach to modeling and optimization for supply chain problems. Two environments of mathematical programming (MP) and constraint programming (CP) were integrated into Hybrid Solution Framework (HSF). The strengths of MP and CP, in which constraints are treated in a different way...

The paper presents a concept and application of a hybrid approach to modeling and optimization the Two-Echelon Capacitated Vehicle Routing Problem. Two environments of mathematical programming (MP) and constraint logic programming (CLP) were integrated. The strengths of MP and CLP, in which constraints are treated in a different way and different m...

The paper presents the concept and the outline of the implementation of a hybrid approach to supply chain optimization. In this approach, integration of two environments of integer programming (IP) and constrain logic programming (CLP) is proposed. The idea behind the new solution is to use the strengths of both environments, in which optimization...

Supply Chain Management (SCM) decisions can be considered at different levels of detail. At a strategic level they apply to the architecture in the supply chain, at the tactical level to transport fleet selection, selection of supply sources and distribution, and at the operational level, to the distribution of supplies and route selection. Many mo...

The paper presents a concept and the outline of the implementation of a hybrid approach to modeling and solving constrained problems. Two environments of mathematical programming (MP) and logic programming (LP) were integrated. The strengths of integer programming (IP) and constraint logic programming (CLP), in which constraints are treated in a di...

The paper presents the concept and an outline of the implementation of a hybrid approach to supply chain modeling and optimization. Two environments mathematical programming (MP) and logic programming (LP) were integrated. The strengths of integer programming (IP) and constraint logic programming (CLP), in which constraints are treated in a differe...

The article presents the problem of supply chain optimization from the perspective of a multimodal logistics provider and includes a mathematical model of multilevel cost optimization in the form of MILP (Mixed Integer Linear Programming). The costs of production, transport, distribution and environmental protection were adopted as optimization cri...

The article presents the problem of supply chain optimization from the perspective of a multimodal logistics provider and includes a mathematical model of multilevel cost optimization in the form of MILP (Mixed Integer Linear Programming). The costs of production, transport, distribution and environmental protection were adopted as optimization cri...

Problem optymalizacji rozdziału palet jest jednym z wielu problemów optymalizacyjnych pojawiających się we współcześnie funkcjonujących centrach dystrybucyjnych. Jest jednak jednym z kluczowych problemów poza optymalizacją tras, optymalizacją rozmieszczenia zapasów w magazynach wysokiego składowania itp. Dodatkowo należy podkreślić, że problem opty...

Constrained search problems (eg. scheduling, planning, resource allocation, placement, routing etc.) appear frequently at different levels of decisions. They are usually characterized by many types of constraints, which make them unstructured and difficult to solve (NP-complete). Traditional mathematical programming approaches are deficient because...

The proposed approach can be considered to be a contribution to scheduling and especially to scheduling problems with additional/external resources. In many enterprises this kind of resources can have an influence on production and delivery schedules. That is especially important in the context of cheap, fast and user friendly decision support in S...

W referacie przedstawiono możliwo's'c formalizacji zagadnienia harmonogramowania zadań i rozdziału obciążeń w postaci problemu spełnienia ograniczeń - Constraint Satisfation Problem (CSP). Omówiono podstawowy algorytm CSP oraz techniki propagacji ograniczeń i backtrackingu. Z wykorzystaniem 'srodowiska programowania w logice z ograniczeniami – Cons...

An analysis of unified framework standing behind a methodology in object oriented decision support system design has been analysed. First of all the consistency of the assumed knowledge bases describing an object (enterprise) and requests (standard options supporting a decision maker), respectively are examined. Then the knowledge base representati...

A unified framework standing behind of a methodology aimed at object oriented decision support system design is considered. First of all the consistency of the assumed knowledge bases describing an object (enterprise) and requests (standard options supporting a decision maker), respectively are examined. Then the knowledge base representation is tr...