Mike Salampasis

International Hellenic University · Information & Electronic Engineering

In recent years, the interest in recommendation systems (RSs) has dramatically increased, as they have become main components of all online stores. The aims of an RS can be multifaceted, related not only to the increase in sales or the convenience of the customer, but may include the promotion of alternative environmentally friendly products or to...

In this study, an ensemble architecture is presented to address the automated patent classification problem at multiple levels. An ensemble architecture of bidirectional LSTM classifiers was employed in the single-label pre-classification task getting an accuracy of 70.70% at the subclass and 53.11% at the group level.

Research into session-based recommendation systems (SBSR) has attracted a lot of attention, but each study focuses on a specific class of methods. This work examines and evaluates a large range of methods, from simpler statistical co-occurrence methods to embeddings and SotA deep learning methods. This paper analyzes theoretical and practical issue...

Purpose In federated search, a query is sent simultaneously to multiple resources and each one of them returns a list of results. These lists are merged into a single list using the results merging process. In this work, the authors apply machine learning methods for results merging in federated patent search. Even though several methods for result...

The DoSSIER project, an European Training Network, was kicked-off in late 2019. The first PhD candidate recruiting activities took place at the beginning of the Covid-19 pandemic and the first years of the project lived in the on-line universe. Naturally, this posed certain challenges to the cohesion of our network. With some delay due to the lock-...

Citation: Delianidi, M.; Diamantaras, K.; Tektonidis, D.; Salampasis, M. Session-Based Recommendations for e-Commerce with Graph-Based Data Modeling. Appl. Sci. 2023, 13, 394. Abstract: Conventional recommendation methods such as collaborative filtering cannot be applied when long-term user models are not available. In this paper, we propose two se...

Many thousands of patent applications arrive at patent offices around the world every day. One important subtask when a patent application is submitted is to assign one or more classification codes from the complex and hierarchical patent classification schemes that will enable routing of the patent application to a patent examiner who is knowledge...

We present a graph-based approach for the data management tasks and the efficient operation of a system for session-based next-item recommendations. The proposed method can collect data continuously and incrementally from an ecommerce web site, thus seemingly prepare the necessary data infrastructure for the recommendation algorithm to operate with...

It seems the expectations that Information Technology (IT) could be adopted widely and rapidly by farmers and extensionists have slightly cooled recently. There is a wide range of possible explanations for the slow adoption rate. This paper discusses the adoption rate of Information Technology (IT) by extension services in a developing country such...

In this paper, we test machine learning methods for results merging in patent document retrieval. Specifically, we examine random forest, decision tree, support vector machine (SVR), linear regression, polynomial regression, and deep neural networks (DNNs). We use two different methods for results merging, the multiple models (MM) method and the gl...

We present a graph-based approach for the data management tasks and the efficient operation of a system for session-based next-item recommendations. The proposed method can collect data continuously and incrementally from an e-commerce web site, thus seemingly prepare the necessary data infrastructure for the recommendation algorithm to operate wit...

Rapid development of mobile devices and the emerging trend of ubiquitous computing has evolved technologies that are always and everywhere available. Augmented Reality and Internet of Things (IoT) are such technologies which either enrich the real-world environment with useful information or receive from the real-world environment useful informatio...

Federated search, also known as distributed information retrieval (DIR), is a technique for searching multiple text collections simultaneously. This chapter presents the basic components of a typical federated search system and the main technical challenges in each component during its operation. We briefly review the methods and techniques of fede...

In this paper we present a method that can be used to attain specific objectives in a typical prior art search process. The objectives are first to assist patent searchers in understanding the underlying technical concepts of a patent by identifying relevant international patent classification (IPC) codes and second to help them conduct a filtered...

Patent search tasks are challenging and often require many hours or even days to be completed. Patent search systems that integrate multiple search tools could assist patent examiners to complete the demanding patent search tasks by using the set of search tools most suitable for the task at hand. PerFedPat is an interactive patent search system de...

In this paper we view the automated selection of patent classification codes as a collection selection problem that can be addressed using existing methods which we extend and adapt for the patent domain. Our work exploits the manually assigned International Patent Classification (IPC) codes of patent documents to cluster, distribute and index pate...

We present PerFedPat, an interactive patent search system based on the federated search approach and the ezDL framework. PerFedPat provides core services to search, using a federated method, multiple online patent resources (currently Espacenet, Google patents, Patentscope and the MAREC collection), thus providing parallel access to multiple patent...

It seems the expectations that Information Technology (IT) could be adopted widely and rapidly by farmers and extensionists have slightly cooled recently. There is a wide range of possible explanations for the slow adoption rate. This paper discusses the adoption rate of Information Technology (IT) by extension services in a developing country such...

Social communication and microblogging services have known unprecedented popularity in recent years. This new digital landscape, combined with the ubiquitous online access potential of modern devices, provides novel capabilities to online users and allows them to express their opinions and attitudes about everything in almost real time. In this pap...

ezDL is an open-source IR frontend system supporting proactivity, higher level search activities, the digital library life cycle, and collaboration of searchers. The ezDL framework is based on an extensible, service-oriented architecture, with user clients running on the desktop, in a browser or as a smartphone app. For performing user-centered eva...

This paper presents a user-centered study of a web based system that can automatically suggest classification codes with the aim to assist patent examiners on the task of patent classification. The aim of the study is twofold. Firstly, we aim to obtain a better understanding of the search tactics patent examiners apply when they do classification s...

This chapter takes a look at the existing search landscape to observe that there are a myriad of search systems, covering all possible domains, which share a handful of theoretical retrieval models and are separated by a series of pre- and post-processing steps as well as a finite set of parameters. We also observe that given the infinite variety o...

This paper presents the traditional Information Retrieval (IR) model which is implemented in current search engines that support web search. Professional search is defined and the parameters that differentiate professional search from web search are discussed. Then, another model that provides an increased design space for developing Integrated Pro...

This paper presents a framework for Integrated Professional Search (IPS) systems. The framework provides a context to better classify and characterize what IPS systems are, but it is also used to better understand the design space of IPS systems. The framework suggests an architecture and methodology to build loosely coupled IPS systems in which ea...

Agriculture is facing continuously new and important problems and challenges. Use of Information and Communication Technologies (ICTs) can be a major intervention for more efficient agriculture. In this editorial paper we present a short introduction of the implications of ICTs in agricultural sector and of the domains that can be considered as the...

Smart phone technology creates new opportunities for farm management applications in small farms. Farmers working on small farms are now able with a low cost smart phone and the specialized software (in our case FarmManager) to obtain facilities that couldn't have on their hands before. The use of the FarmManager software in a smart phone can overl...

Professional search in specific domains (e.g. patent, medical, scientific literature, media) usually needs an exploratory type of search which is characterized more often, in comparison to fact finding and question answering web search, by recall-oriented information needs and by uncertainty and evolution or change of the information need. Addition...

Searching for patents is usually a recall-oriented problem and depending on the patent search type, quite often a problem which is characterized by uncertainty and evolution or change of the information need. We propose an exploratory strategy for patent search that exploits the metadata already available in patents in addition to the results of cl...

We present a patent search system that explores three issues: (a) topical organization of patents based on their IPC, (b) collection selection of topically organised patent collections and (c) integration of collection selection tools to patent search systems. Patent documents produced worldwide have manually-assigned classification codes which in...

This technical report presents the work which has been carried out using Distributed Information Retrieval methods for federated search of patent documents for the passage retrieval starting from claims (patentability or novelty search) task. Patent documents produced worldwide have manually-assigned classification codes which in our work are used...

Purpose The purpose of this paper is to describe TraceALL which is a Semantic Web (SW), ontology‐based, service‐oriented framework which aims to provide the necessary infrastructure enabling food industry (particularly SMEs) to implement traceability applications using an innovative generic framework. Design/methodology/approach The framework buil...

In this paper we present a method to enrich the classical web searching with entity mining that is performed at query time. The results of entity mining (entities grouped in categories) can complement the query answers with useful for the user information which can be further exploited in a faceted search-like interaction scheme. We show that the a...

This paper presents an experimental user-centered evaluation of two hypermedia system architectures, each representing a different interaction model and information-seeking environment. The first system is a hypermedia digital library based on the World Wide Web. This system represents an interaction model in which information seekers consistently...

In this paper, a new source selection algorithm for uncooperative distributed information retrieval environments is presented. The algorithm functions by modeling each information source as an integral, using the relevance score and the intra-collection position of its sampled documents in reference to a centralized sample index and selects the col...

We propose a new integral-based source selection algorithm for uncooperative distributed information retrieval environments. The algorithm functions by modeling each source as a plot, using the relevance score and the intra-collection position of its sampled documents in reference to a centralized sample index. Based on the above modeling, the algo...

Source selection deals with the problem of selecting the most appropriate information sources from the set of, usually non-intersecting, available document collections. On the other hand, data fusion techniques (also known as metasearch techniques) deal with the problem of aggregating the results from multiple, usually completely or partly intersec...

The World Wide Web is today the largest information seeking environment. Millions of people use it to satisfy their information needs. Although it is quite easy for able-bodied users to use it, there are still a lot of problems for people with disabilities. A major group of them are blind users. Blind users navigate the web in a different and less...

In this paper, a new source selection algorithm for uncooperative distributed information retrieval environments is presented. The algorithm functions by modeling each information source as an integral, using the relevance score and the intra-collection position of its sampled documents in reference to a centralized sample index and selects the col...

Greek is one of the most difficult languages to handle in Web Information Retrieval (IR) related tasks. Its difficulty stems from the fact that it is grammatically, morphologically and orthographically more complex than the lingua franca of IR, English. In this paper, we address a significant number of issues that originate from the Greek language....

Intelligent adaptive user interfaces have been long explored as a promising technique to solve problems due to the complexity of modern user interfaces. These problems can occur in various application settings such as accessing the Web from small screen devices, over a Telephone Based Interface or disabled people accessing the WWW using specialised...

Distributed Information Retrieval (DIR) has been suggested to offer a prospective solution to a number of issues concerning information retrieval in the WWW. On the other hand, previous studies have indicated that centralized approaches offer the best solution for optimal quality of result (i.e. effectiveness). In this paper, we revisit those claim...

The problem of results merging in distributed information retrieval environments has gained significant attention the last years. Two generic approaches have been introduced in research. The first approach aims at estimating the relevance of the documents returned from the remote collections through ad hoc methodologies (such as weighted score merg...

The problem of results merging in distributed information retrieval environments has been approached by two different directions in research. Estimation approaches attempt to calculate the relevance of the returned documents through ad-hoc methodologies (weighted score merging, regression etc) while download approaches, download all the documents l...

This paper presents a “Semantic Web application framework” which allows different applications to be designed and developed for improving the accessibility of the World Wide Web (WWW). The framework promotes the idea of creating a community of people federating into groups (ontology creators, annotators, user-agent developers, end-users) each playi...

The Web has turned out to be an interactive and complex information seeking environment where apart from text, layout and visual cues play a significant role in its efficient use. In this paper we present a semantic web based framework for communicating this visual meta-information to blind users who miss it. Based on annotations of web pages blind...

This paper describes a new algorithm for merging the results of remote collections in a distributed information retrieval environment. The algorithm makes use only of the ranks of the returned documents, thus making it very efficient in environments where the remote collections provide the minimum of cooperation. Assuming that the correlation betwe...

Browsing shortcuts is a mechanism which facilitates blind people to move efficiently to various elements of a Web page (e.g. functional elements such as forms, navigational aids etc.) hence operating effectively as an interaction method and a vital counterbalance to low accessibility of web pages. Results of a quantitative analysis which measured n...

Held as Part of HCI International 2007;

2 vol.

The evolving technologies of Semantic Web and Web services are providing new means for application integration frameworks. The need for semantically enriched information exchange over the flexible environment of the internet provides a valuable enhancement to traditional methods and technologies for Enterprise Application Integration. However the u...

One of the biggest issues the World Wide Web (WWW) community has to overcome nowadays is accessibility for all. The rapid development of the WWW using doubtful web authoring practices, together with the domination of the desktop metaphor in the web page design, created accessibility problems for people with disabilities using the WWW. Until now sev...

One of the biggest issues the World Wide Web (WWW) community has to overcome is accessibility for all. The rapid expansion of the WWW using problematic web authoring practices, together with the dominance of the desktop metaphor in web page design has raised many WWW accessibility problems for people with disabilities. In this paper we present a wh...

The World Wide Web (WWW) has become a vital aspect of our society since it has become the largest information source and a new medium for communication. However, the primary interaction mode with the WWW is via web browsers designed for visual modes of interaction, and this restricts access to the WWW for an entire community of people which are bli...

This paper reports the results of a user-centered experiment which examined the effect of parallel multi-database searching using automated collection fusion strategies on information seeking performance. Three conditions were tested in the experiment. Subjects in the first condition performed search tasks in a WWW-based distributed hypermedia digi...

The WWW is today the biggest source of information and an essential tool for many activities of daily life. Unfortunately, information seeking in this complex hypermedia environment is generally not an easy task. The potentially complex task of information seeking in the WWW is further complicated when the end-user is blind or visually impaired (VI...

The rapidly increasing size of the World Wide Web (WWW) created great needs in the discipline of Information Retrieval (IR). Initially these needs were covered by web search engines, which gave a good solution as far as the size of the web was manageable. Later on the size of the web and its rhythm of expansion started creating problems for the sea...

The great expansion of Information Technology (IT) creates many new vital challenges for the future of the enterprises in the agri-food sector. In fact, many members in the agri-food sector have realised the challenges and that adoption of IT is crucial for their survivor. For this reason, different types of Agricultural Information Systems (AISs)...

Universal accessibility is one of the primary targets in the development of the World Wide Web (WWW), but unfortunately some groups of people have problems in accessing the WWW efficiently. Clearly, blind users are such a grou p that must deal firstly with the reading task of a web page. Secondly, because the WWW has turned into a highly interactiv...

This paper discusses the use of linear programming in a decision-making system for broiler enterprises. The general model of linear programming is presented and the specific conditions and constraints of a modern typical broiler enterprise are examined. A scenario of a case study that was applied in a collaborating broiler enterprise is discussed a...

This paper presents an experimental user-centered evaluation of two hypermedia system architectures, each representing a different interaction model and information-seeking environment. The first system is a hypermedia digital library based on the World Wide Web. This system represents an interaction model in which information seekers consistently...

This paper discusses the current status about the adoption of Information Technology (IT) by the extension services in a developing country such as Albania. Similar to other former Easter European countries, Albania is moving towards a western-type economy and an intensive effort is made to promote the use of IT for providing decentralised extensio...

This paper presents a method for solving the collection fusion problem in hypermedia digital libraries. The proposition which is explored and evaluated is that across document links between hypermedia documents residing in distributed hypermedia collections can supply sufficient useful information to allow effective collection fusion. In contrast t...

Nowadays, we are witnessing the development of new information-seeking environments and applications such as hypermedia digital libraries. Information Retrieval (IR) is increasingly embedded in these environments and plays a cornerstone role. However, in hypermedia digital libraries IR is a part of a large and complex user-centred information-seeki...

In this paper a hypermedia digital library is presented which has been designed and developed to meet the educational needs of Greek beekeepers. These needs are not fulfilled by the current extension services. This lack has identified as one potential reason for the low productivity of the industry in Greece. Five distributed hyperbases have been p...

The expansion of the World Wide Web (WWW) has created an increasing need for tools capable of supporting WWW authors in composing documents using the HyperText Markup Language (HTML). Currently, most web authors use tools which are basically ordinary text editors and have additional features to facilitate the easy and correct use of HTML tags. This...

Thesis (Ph. D.)--University of Sunderland, 1997.

In recent years, the great expansion of distributed resources through for example the Internet has set-up a framework for the realisation of an age-old vision: gaining first- hand immediate access to vast amounts of information. The concept of a digital library is a step towards the realisation of this vision, and can be regarded (from a computer s...

The idea of a digital library has many facets; and as such, is the focus for a number of emerging areas of study. We consider digital libraries as heterogeneous and dynamic information environments, and to that end, have identified inter-operability and extensibility as essential characteristics for effective digital libraries. We present what may...