Determining the Level of Market Concentration in the Construction Sector—Case of Application of the HHI Index

Background—competitive conditions are often distorted in the construction sector, therefore this affects the market position of all participants. This paper seeks to find the tools for properly assessment of participants by Herfindahl-Hirschmann index (HHI) and to identify what parameters have the greatest impact in the competitiveness of the construction sector. Methods: in this article the DEMATEL method was used whereas tool for assessing the balance of market concentration as it may help to determine factor with the greatest influence on a firm’s HHI. Results in this work showed how different parameters affect each other and their impact on a value of a firms’s HHI. When the parameters are determined, they can be useful for assesment of mergers their influence on the HHI and alteration of the market’s power balance. Conclusions—The calculation of the HHI by using the DEMATEL method allowed to check the empirical implementation check of the multicriteria assessment method, on the market power of business entities, operating in the distorted market conditions of the construction sector.

ПРОБЛЕМИ УПРАВЛІННЯ В СИСТЕМАХ SMART GRID УНІВЕРСИТЕТСЬКОГО ХАБА ЕНЕРГОЕФЕКТИВНОСТІ

The article attempts to tackle the issues of enhancing the performance of university energy efficiency management systems. An emphasis is put that in modern realia, alternative and renewable energy sources are becoming increasingly important in the electric power sector, thus contributing to environmental protection and enabling active electricity consumers to have their own sources of energy generation. However, it is observed that the relationships between energy generation sources and electricity consumers are complicated by new demands for setting balancing modes due to certain volatility of energy generation by alternative sources as well as the need to connect additional energy storage facilities. To identify opportunities of using Smart Grid technologies to manage the University energy consumption, a power balance equation was used to determine an active power balance between generated power, generation sources and power consumed by electricity consumers. In addition, the indicators of the total active power loss in the electrical network associated with the technological consumption of energy for its transmission was included into this equation. The study presents the results of an in-depth critical analysis on Smart Grid methodology and provides argument for the relevance of using artificial intelligence techniques in Smart Grid management systems of the University energy efficiency hub, along with suggesting a notion of electricity generating consumer in the concept of intelligent networks with two-way flow of energy and information as subsystems of a different nature. It is argued that the developed conceptual model of the electricity generating consumer for multilevel smart grid management systems and their infrastructure within the University energy efficiency hub allows establishing relationships between its structural elements and objects of different character. The findings reveal that the specifics of the developed method in setting priorities and regulatory standards for optimal management by a generating consumer within the University energy efficiency hub is the possibility of its automatic adaptation to changes in the external environment subject to interactions between electricity generating consumers.

Iron Loss Quantification in the Aim of the Estimation of Eddy Currents in Clamping Devices

In high power electrical machines, the leakage magnetic flux due to end windings induces eddy currents in clamping devices. However, it is quite difficult to quantify these losses. In order to study the effect of different clamping materials and the impact of the magnetization direction, an experimental mock-up composed of a stator and a clamping plate has been developed. An axial coil generates a circumferential magnetic flux in the stator core at different frequencies. Eddy current losses in the clamping plates are deduced from a power balance by subtracting Joule losses and iron losses from the total measured losses. Iron losses are deduced from 3D FE calculations while the impact of the frequency on B(H) curve is taken into account. Losses in the clamping device are then analyzed depending on experimental parameters.

Global Sliding-Mode Control with Fractional-Order Terms for the Robust Optimal Operation of a Hybrid Renewable Microgrid with Battery Energy Storage

The efficiency of hybrid microgrid systems is drastically affected by the number of power electronics converters interfacing with its components. Integrating distributed energy sources with microgrids with the optimal number of converters is crucial to minimizing the switching losses and power conversion stages, thereby improving the efficiency of the systems. This paper considers an efficient and economical configuration for a wind/solar photovoltaic (PV) system integrated with a battery energy storage system (BES). The PV system is connected directly to the DC-link, thus lowering the losses and cost by eliminating the PV boost converter. In the literature, only a few publications have investigated this effective microgrid configuration. In addition, none of the publications have developed a nonlinear control approach for the microgrid configuration. Due to the greater flexibility of fractional calculus in speeding up the system response and improving the robustness, this article proposes a global sliding-mode control method with fractional-order terms (GSMCFO) to enhance the transient, steady-state, and robust operation of the hybrid microgrid. This controller provides the maximum power point tracking (MPPT) of both the solar PV and wind power generators, regulates the DC-link voltage, ensures proper power transfer to the grid, and maintains the power balance. In addition, the GSMCFO guarantees the global stability of the hybrid microgrid. Furthermore, considering the simplicity, robustness, few control variables, and fast convergence rate of the differential evolution (DE) optimization method, it is utilized to optimize the performance of the GSMCFO. The proposed hybrid microgrid configuration under the action of the GSMCFO was simulated in MATLAB/SIMULINK. Various scenarios were investigated to illustrate the feasibility of the proposed scheme. The simulation results show that the GSMCFO can achieve superior dynamic performances than the proportional–integral (PI) controller with zero overshoot, a shorter settling time, and stronger robustness, thus improving the power balance of the hybrid microgrid.

Ensuring power balance in a hybrid power system with a standby generator

The combination of several non-guaranteed random energy sources (RES), conventional sources, and nonconstant consumer loads in a local system leads to stochastic power imbalances. This study objective consists in determining the possibilities of ensuring the power balance in a hybrid power generation system with a standby generator and a search for the methods of calculating the optimal parameters to achieve energy balance. This objective is achieved by simulating the processes inherent in wind and solar power engineering and the regimes of energy consumption through a combination of random functions with a standard probability distribution. Aggregated data on weather factors for several years in a region with a high renewable energy potential which can be used to describe the behavior of wind and solar energy over time were used as experimental data. The use of multiple simulations of random processes with calculated parameters has made it possible to draw conclusions about the presence of certain ratios of power and the generator control modes. These ratios can determine minimum energy and consumption losses, reduce the likelihood of energy imbalance, more efficiently use the reserved power. Specific features of the stochastic nature of RES related to the presence of trends and random fluctuations at short hourly intervals were additionally taken into account. Possibilities of varying the conditions of and switching on and off of the standby generator were provided. The existence of some ranges was established for the installed power of the generator outside which its use becomes inefficient. The proposed approach makes it possible to find the probability of various system states, assess the reliability of energy supply, and minimize unproductive losses.

ASEAN Way: Managing Expectation in the Code of Conduct for the South China Sea

ASEAN WAY: MANAGING EXPECTATION IN THE CODE OF CONDUCT FOR THE SOUTH CHINA SEA Naifa Rizani Lardo Centre for Strategic and International Studies (CSIS) Indonesia,S. Rajaratnam School of International Studies (RSIS) Singapore Email: [email protected]: 5 October 2021; accepted: 13 November 2021 AbstrakLandasan pesimistis proses ASEAN Way seringkali menurunkan kredibiltas dari peran Perhimpunan Bangsa-Bangsa Asia Tenggara (ASEAN) dalam menangani sengketa di Laut Tiongkok Selatan (LTS). Justifikasi tersebut disikapi melalui konsep power balance yang mendiskreditkan struktur norma institusionalisme dalam ASEAN Way. Hal ini mendorong rangkaian diskusi terkait kinerja ASEAN melalui prinsip ASEAN Way dalam proses Code of Conduct for the South China Sea (COC for SCS) yang membuka ruang ekspektasi untuk meningkatkan peran keamanan regionalnya. Melalui permasalahan ini, artikel ini menyuguhkan pandangan peran kemanan regional ASEAN di proses sengketa LTS dengan merumuskan pertanyaan “Apa yang bisa diharapkan dari norma ASEAN Way dalam proses COC for SCS?” Dengan menggunakan pendekatan norma institutionalisme dalam proses perumusan COC, artikel ini menunjukkan bahwa ASEAN Way tidak dibentuk sebagai solusi penyelesaian konflik LTS, melainkan sebagai penyokong bentuk kerja sama pertahanan dengan asas fleksibel bagi partisipan konflik di isu LTS. Adapun, kontribusi ASEAN Way dalam COC for SCS terjabarkan dengan memberikan ruang fleksibilitas bagi pemangku kepentingan untuk berdialog secara damai di luar ketidakseimbangan kekuatan yang terjadi dari proses COC. Hal ini dengan proses yang fleksibel dalam membawa Tiongkok dan pemangku kepentingan terkait lainnya menuju kerja sama keamanan kooperatif yang dapat memenuhi kepentingan bersama dalam perdamaian di kawasan Asia Tenggara. Pendekatan norma institusionalisme ini juga menunjukkan limitasi-limitasi dari kemampuan ASEAN yang dapat membatasi ekspektasi dari perumusan COC for SCS ke penyelesaian sengketa di LTS. Kata kunci:ASEAN, Laut Tiongkok Selatan, Code of Conduct, Tiongkok, ASEAN Way AbstractPessimistic perspectives on the ASEAN Way process frequently undermine the role of the Association of Southeast Asian Nations (ASEAN) in resolving the South China Sea (SCS) dispute. These justifications are addressed through the notion of power balance, which undermines the norm institutionalism framework that underlines the ASEAN Way’s foundation. This droves various conversations on ASEAN capabilities ahead of the ASEAN Way principle throughout the Code of Conduct for the South China Sea (COC for SCS) process, which questioned its expectations as a regional security body. This article offers insight on ASEAN’s regional security role in the SCS dispute peace process, guided by the question “What to expect from ASEAN Way in the process of COC for SCS?” Instead of following the power balance approach, this article suggests a norm-based institutionalism perspective through ASEAN Way to the COC process. The ASEAN Way was developed to facilitate security cooperation under flexible participation among relevant parties involved in the conflict. The ASEAN Way on COC for SCS contributes by allowing relevant actors to engage in peaceful dialogue despite the power imbalance that existed on the disputed sea. This flexible participation offered by ASEAN can deliver cooperative security to the Southeast Asia region in the interest of peace. Nonetheless, norm institutionalism also revealed limitations in ASEAN capability that impede the expectation of the formulation of COC for SCS to the resolution of SCS disputes.

Sori Yanagi’s Industrial Design Aesthetics

With the development of social economy, industrial design has become more and more influential. The development of the industrial design industry is one of the signs showing a modern civilization, innovation ability and comprehensive national strength. In the future economic development, design will become the mainstream force driving innovation. It can be seen that showing the added value in industrial design is a popular trend in the power balance between countries in the future. This article will discuss the aesthetic thought of Sori Yanagi, the father of Japanese industrial design, and discuss the influence of his aesthetic thought on Japanese industrial design.

IMPLEMENTATION OF ZONE PRINCIPLE IN THE CONTROL SYSTEM OF REGULATION AND MONITORING EQUIPMENT OF SPACECRAFT ONBOARD NETWORK

Описывается применение принципа зонного регулирования при разработке системы управления аппаратуры регулирования и контроля бортовой сети космического аппарата. Приведены краткие описания аппаратуры регулирования и контроля и входящих в её состав модулей. Приведены функциональная схема регулирования аппаратуры регулирования и контроля и график совместной работы её модулей с разбиением на зоны. Рассмотрена система управления аппаратурой регулирования и контроля. Приведены структурные схемы формирования управляющего воздействия для всех регуляторов аппаратуры регулирования и контроля. Реализация принципа зонного регулирования достигается тем, что вся область возможного изменения сигнала управления разбита на зоны работы, при этом каждому типу модулей выделена своя зона работы. Такой подход, в зависимости от баланса мощности "потребитель - источники", обеспечивает автоматическое подключение требуемых регуляторов. Данный принцип обеспечивает непрерывное изменение сигнала управления в зависимости от энергобаланса системы и параметрических возмущений. Полученную систему можно рассматривать как квазилинейную, что позволяет использовать известные линейные методы синтеза и анализа системы управления, при этом настройка контуров регулирования с заданными показателями качества осуществляется раздельно для каждого типа модулей аппаратуры регулирования и контроля The article describes the application of the zone regulation principle in the development of control system for the regulation and monitoring equipment of the spacecraft's onboard network. We present brief descriptions of the regulation and monitoring equipment and its constituent modules. We show regulation functional diagram of the regulation and monitoring equipment and collaboration of its modules graph with the division into zones. We describe the control system for the regulation and monitoring equipment. We present structural diagrams of the formation of a control action for all regulators of the regulation and monitoring equipment. Zone regulation principle implementation is achieved by the fact that the entire area of possible changes in the control signal is divided into zones of operation. Each type of module has its own zone of operation. This approach provides automatic connection of the required regulators depending on the power balance of the "consumer - sources". This principle provides a continuous change in the control signal depending on the energy balance of the system and parametric disturbances. The system can be considered as quasilinear, which makes it possible to use well-known linear methods of synthesis and analysis of control system. We carried out control loops customization with determined quality indicators separately for each type of the regulation and monitoring equipment modules.