A polling system whose stability region depends on a whole distribution of service times

We present an example of a single-server polling system with two queues and an adaptive service policy where the stability region depends on the expected values of all the primitives and also on a certain exponential moment of the service-time distribution in one of the queues. The latter parameter can not be determined, in general, in terms of any finite number of power moments. It follows that the fluid approximation approach may not be an appropriate tool for the stability study of this model.Comment: 6 page

On the Stability of a Polling System with an Adaptive Service Mechanism

We consider a single-server cyclic polling system with three queues where the server follows an adaptive rule: if it finds one of queues empty in a given cycle, it decides not to visit that queue in the next cycle. In the case of limited service policies, we prove stability and instability results under some conditions which are sufficient but not necessary, in general. Then we discuss open problems with identifying the exact stability region for models with limited service disciplines: we conjecture that a necessary and sufficient condition for the stability may depend on the whole distributions of the primitive sequences, and illustrate that by examples. We conclude the paper with a section on the stability analysis of a polling system with either gated or exhaustive service disciplines.Comment: 16 page

Increasing territorial capitalization by incorporation of small enterprises into clusters

Modernization of the Russian national economy depends on small businesses and their involvement in capitalization of the territorial potential. This article discusses methods, models, and mechanisms of territorial capitalization based on incorporation of small business enterprises into clusters along with medium- and large businesses. We propose an optimization model for assessing the efficiency of such clusters: our research has shown that this model can be applied for decision-making in regional strategic planning. Methodologically, this study relies on the theories of industrial development and economic growth, the industrial cluster theory, and the works of Russian and international researchers on mechanisms of management of territorial potential, their establishment and implementation. Capitalization of the region's resource potential manifests itself in the form of static and dynamic effects. We developed models of interaction between small and other businesses and structures within a cluster oriented towards territorial capitalization. We demonstrated that incorporation of a university into a cluster structure increases the innovative capacity of all cluster members. This research may be further expanded to study the mechanisms of involving small businesses operating in peripheral areas into clusters

Path Ranking with Attention to Type Hierarchies

The objective of the knowledge base completion problem is to infer missing information from existing facts in a knowledge base. Prior work has demonstrated the effectiveness of path-ranking based methods, which solve the problem by discovering observable patterns in knowledge graphs, consisting of nodes representing entities and edges representing relations. However, these patterns either lack accuracy because they rely solely on relations or cannot easily generalize due to the direct use of specific entity information. We introduce Attentive Path Ranking, a novel path pattern representation that leverages type hierarchies of entities to both avoid ambiguity and maintain generalization. Then, we present an end-to-end trained attention-based RNN model to discover the new path patterns from data. Experiments conducted on benchmark knowledge base completion datasets WN18RR and FB15k-237 demonstrate that the proposed model outperforms existing methods on the fact prediction task by statistically significant margins of 26% and 10%, respectively. Furthermore, quantitative and qualitative analyses show that the path patterns balance between generalization and discrimination.Comment: Thirty-Fourth AAAI Conference on Artificial Intelligence (AAAI-20

Tactile models for older adults with vision impairments

Starší lidé s těžkým poškozením zraku často žijí v ústavních zařízeních poskytujících specializovanou péči. Tato skupina uživatelů má specifické potřeby, schopnosti a preference, především z hlediska orientace v prostoru, interakce s technologiemi a volnočasových aktivit. V této práci jsem navrhla pipeline pro rekonstrukci budovy z obrazů, které splňují požadavky patentu „Trojrozměrný model budovy primárně pro zrakově postižené starší dospělé“ pro vytvoření taktilní 3D mapy pro zrakově postižené starší dospělé. Pipeline byla navržena, implementována a testována s cílovou skupinou uživatelů pomocí metody User-centered design. Výsledky hodnocení ukazují, že je stále co zlepšovat. Dále jsem navrhla a vytiskla vnější část budovy domova Palata. Tištěný 3D model byl poté přilepen na dřevěný model vytvořený vedoucím mé práce v rámci implementace výše uvedeného patentu. Vyhodnotila jsem model, který jsem vytvořila, s nevidomým odborníkem. Odorník sdílil spoustu cenných poznatků, jak model vylepšit.Older adults with severe vision impairments often live in residential care institutions that provide specialized care. This user group has specific needs, abilities, and preferences, primarily from the perspective of orientation in space, interaction with technologies, and free-time activities. In this thesis I have proposed a pipeline for reconstruction of a building from images that satisfies the requirements of the patent 'Three-dimensional model of a building primarily for visually impaired older adults' for creation of a tactile 3D map for the visually impaired older adults. The pipeline was designed, implemented and tested with a target user group using the User-centered design method. The results of the evaluation show that there's still a lot to be improved. Furthermore, I have designed and 3D printed an exterior part of the Home Palata building. The printed 3D model was then glued to a wooden model created by Ing. Miroslav Macík, Ph.D. as part of the implementation of the patent mentioned before. I have evaluated the model that I have created with a visually impaired expert. He has shared a lot of valuable insights to improve the model