Real Design Research Articles

Digital Gifts and Tourism Mementos: A Sustainable Approach

Touristic destinations all around the world are struggling to digitally transform the touristic experience and the touristic products they offer and to capitalize a good experience with new tourists and returning ones. There is a lot of research on digital solutions assisting tourism, but it does not provide a follow-up digital product, therefore depending only on physical gifts, postcards and mementos. In this work, we propose a novel platform that can provide a personalized digital memento or digital gift for every route or tourist destination that can become the digital point of reference of visitors’ experience giving new dimensions for commercialization to the existing physical mementos at the gift shops. The purpose of this study is to analyze what comprises a memorable touristic experience and to design and, finally, present a total solution that builds and offers a personal e-souvenir of a touristic experience to the tourist for him to hold, sport and share just using his mobile phone. We propose a digital memento-building platform that includes the personalized experience in visits taking place while in vacations. The visitors are usually taking pictures along routes they follow that later need further organization and processing and that in no way substitutes the physical mementos. In our approach, we propose a solution that generates a unique and personalized e-souvenir through a collage of the selfies and photos creating the digital equivalent of the touristic postcards but in our case personalized with the visitor photos with minimum amount of effort and produced real-time. Our approach is also providing a platform to the photographers and designers of touristic destinations to build and graphically generated memento artifacts—templates specific for one or more destinations or routes. In this way, the approach serves the tourism industry vertically, covering all aspects, i.e., the tourist-visitor, the tourism professional players such as photographers, designers of physical mementos and, of course, the touristic destination providing a digital footprint to server marketing of the destination through sharing on social media and word-of-mouth, of course. To support our approach, we have built and run a fully working prototype in the touristic center of Athens, Greece, with real users and designers for several weeks during summer vacations. The results have been greatly encouraging from end-users and professionals. The study shows that it is possible for various lines of business to come together and work along one another for an improve touristic experience using mobile technologies in a personalized, targeted approach. The touristic destination, graphic designers, photographers, tourist agent specialists, software developers and visitors can all now have a digital personalized memorable gift from the visit.

Development of creative thinking in the process of project activity in the conditions of digital transformation of technological education

The article considers the peculiarity of the development of student’s creative thinking in educational project activities in the learning process in the context of the digital technologies use in technological education. The main basic principles of the development of the subject area “Technology” as the most important element of mastering the competencies and skills of the XXI century are analyzed, taking into account the need to use modern digital technologies in the process of project activity, as a fundamental direction of mastering new knowledge in an intensively developing world. Based on the analysis of research by domestic and foreign scientists, it is shown that educational project activities contribute to the development of creative thinking when conditions are met that is close to the real design process. Some possible options for the implementation of educational project activities in modern conditions of digital transformation of technological education are described. The measures to solve the problems of modern technological education, contributing to the qualitative organization of the educational process, which relate to both the creation of pedagogical conditions and the corresponding material and technical base, are noted.

The Role of Feedback in Dynamic Crowdsourcing Contests: A Structural Empirical Analysis

In this paper, we empirically examine the impact of performance feedback on the outcome of crowdsourcing contests. We develop a dynamic structural model to capture the economic processes that drive contest participants’ behavior and estimate the model using a detailed data set about real online logo design contests. Our rich model captures key features of the crowdsourcing context, including a large participant pool; entries by new participants throughout the contest; exploitation (revision of previous submissions) and exploration (radically novel submissions) behaviors by contest incumbents; and the participants’ strategic choice among these entry, exploration, and exploitation decisions in a dynamic game. Using counterfactual simulations, we compare the outcome of crowdsourcing contests under alternative feedback disclosure policies and award levels. Our simulation results suggest that, despite its prevalence on many platforms, the full feedback policy (providing feedback throughout the contest) may not be optimal. The late feedback policy (providing feedback only in the second half of the contest) leads to a better overall contest outcome. This paper was accepted by Gabriel Weintraub, revenue management and market analytics department.

Coupling impacts of spray and rainfall on road visibility and vehicle speeds: a simulation-based analysis

Impaired visibility resulting from rainfall contributes greatly to the occurrence of traffic accidents. This study presents a numerical simulation approach to analyze the extent to which the coupling of spray and raindrops reduces visibility and, thus, proposes safe speeds against inadequate visibility. The spray–raindrop coupling particles were modeled by considering real highway design parameters and rainfall conditions. The road visibility was estimated through simulating the multiple scattering process of taillights in the spray–rain medium, and the maximum safe speed against inadequate visibility was then derived by comparing the visibility with the required stopping sight distance. Results show that: (i) either a high speed of the front truck or a thick water film results in a significant reduction in road visibility and the maximum safe speed of the ego vehicle, (ii) front vehicle speed plays a more important role in visibility reduction than the water film thickness does.

AN OPTIMIZATION MODEL FOR PRELIMINARY STABILITY AND CONFIGURATION ANALYSES OF SEMI-SUBMERSIBLES

In the modern era of design governed by economics and efficiency, the preliminary design of a semi-submersible is critically important because in an evolutionary design environment new designs evolve from the basic preliminary designs and the basic dimensions and configurations affect almost all the parameters related to the economics and efficiency (e.g. hydrodynamic response, stability, deck load and structural steel weight of the structure, etc.). The present paper is focused on exploring an optimum design method that aims not only at optimum motion characteristics but also optimum stability, manufacturing and operational efficiency. Our proposed method determines the most preferable optimum principal dimensions of a semi-submersible that satisfies the desired requirements for motion performance and stability at the preliminary stage of design. Our proposed design approach interlinks the mathematical design model with the global optimization techniques and this paper presents the preliminary design approach, the mathematical model of optimization. Finally, a real world design example of a semi-submersible is presented to show the applicability and efficiency of the proposed design optimization model at the preliminary stage of design.

SMART APARTMENT DESIGN FOR A LOW MOBILE RESIDENT

The article considers the problem of design of a smart apartment as a new level of historical development of small housing. Various aspects of housing cell formation are considered in the scientific works of Bachynska L.G., Gnesya I.P., Gnat G.O. etc.The history of furniture development with the signs of transformation was studied by scientists: Bosyi I.M., Mygal S.P., Z. Dyachun., Vergunova N.S. The purpose of the study is to identify methods of forming the interior of a small residential cell, taking into account the requirements of comfortable living for a small mobile resident. Factors that determine the comfort of the living cell environment and the means to create conditions to ensure a comfortable stay and life in a limited area have been identified. One of the aspects of shaping the interior design of a smart apartment is the use of furniture-transformers. The classification of furniture-transformers according to the level of transformation is carried out: furniture that changes its position without changing the function; furniture that combines several functions; spatial «housing cube».
 The main directions of architectural and planning organization of smart apartments are identified: hotel-type apartment, studio apartment, apartment with two rooms, and their possibilities for organization of main functional zones. The basic expedient architectural and planning schemes of smart apartments with examples of their zoning, placement of furniture and interior design are developed and given. It was found that to create a barrier-free living environment for a low-mobility resident, the most acceptable schemes are a two-room apartment or a studio apartment, due to the size and square shape of the plan, which allows you to organize movement and access to furniture in a wheelchair. Based on a comprehensive consideration of the requirements for environmental comfort, regulatory requirements for barrier-free space, features of the use of furniture-transformers, compositional techniques of space organization, ergonomics and energy efficiency, the use of new technologies and modern environmental finishing materials, have been developed and implemented in real design smart apartment concept for little mobile resident. The description of project development with the substantiation of the accepted decision is given. According to the results of the study, recommendations for the design of the interior of a smart apartment for a low-mobile resident were formulated, including: «free floor», access and ease of use of furniture, equipment and technical equipment; use of furniture-transformers.

RWRoute: An Open-source Timing-driven Router for Commercial FPGAs

One of the key obstacles to pervasive deployment of FPGA accelerators in data centers is their cumbersome programming model. Open source tooling is suggested as a way to develop alternative EDA tools to remedy this issue. Open source FPGA CAD tools have traditionally targeted academic hypothetical architectures, making them impractical for commercial devices. Recently, there have been efforts to develop open source back-end tools targeting commercial devices. These tools claim to follow an alternate data-driven approach that allows them to be more adaptable to the domain requirements such as faster compile time. In this paper, we present RWRoute, the first open source timing-driven router for UltraScale+ devices. RWRoute is built on the RapidWright framework and includes the essential and pragmatic features found in commercial FPGA routers that are often missing from open source tools. Another valuable contribution of this work is an open-source lightweight timing model with high fidelity timing approximations. By leveraging a combination of architectural knowledge, repeating patterns, and extensive analysis of Vivado timing reports, we obtain a slightly pessimistic, lumped delay model within 2% average accuracy of Vivado for UltraScale+ devices. Compared to Vivado, RWRoute results in a 4.9× compile time improvement at the expense of 10% Quality of Results (QoR) loss for 665 synthetic and six real designs. A main benefit of our router is enabling fast partial routing at the back-end of a domain-specific flow. Our initial results indicate that more than 9× compile time improvement is achievable for partial routing. The results of this paper show how such a router can be beneficial for a low touch flow to reduce dependency on commercial tools.

COMPETITIVE DESIGN BASED ON THE TASKS OF REAL CUSTOMERS IN THE ARCHITECTURAL SCHOOL AS A NEW VECTOR FOR THE FORMATION OF NATIONAL EDUCATION OF THE FUTURE (BASED ON THE EXAMPLE OF THE ACTIVITY OF THE DEPARTMENT OF ARCHITECTURAL ENVIRONMENT DESIGN IN THE LVIV POLYTECHIC

The article highlights the place of competitive design based on the tasks of real customers in the educational process of students of the Lviv architectural school – at the Department of Architectural Environment Design. An important component of education at the department was competitive futuristic design in the form of international and national student design seminars and competitions. The purpose of this vector is to prepare our students for the strict conditions of the need to comply with regulatory requirements in real design and at the same time teach them to experiment freely and creatively. The more complex the project task, methodology, and requirements for its implementation, and the more restrictions there are in the project, the better and more efficient the imagination should work. Participation of students in educational competitive design based on the tasks of real customers helps to educate and study them not by artisans with limited creative imagination, but by master artists and at the same time highly educated professional engineers. In the competitive projects made under real orders, special ones were those that were developed in 2021, because they were carried out taking into account the problems caused by the COVID-19 pandemic. Among them, projects for the best draft proposal of a new architectural solution and expansion of the functions of the Panorama shopping centre in Odesa stand out. These projects are valuable because they were solved not only in one aspect – by offering only typological, spatial, functional or architectural and aesthetic ideas, but by taking them syncretically all together. Teachers of the Department of Architectural Environment Design are convinced that this practice can significantly enrich the educational process because it teaches students to work in teams, use all the special knowledge acquired during their studies in the field of architecture, create without feeling barriers between educational, search, experimental, competitive and real design.

High-NA optical edge detection via optimized multilayer films

There has been a significant effort to design nanophotonic structures that process images at the speed of light. A prototypical example is in edge detection, where photonic-crystal-, metasurface-, and plasmon-based designs have been proposed and in some cases experimentally demonstrated. In this work, we show that multilayer optical interference coatings can achieve visible-frequency edge detection in transmission with high numerical aperture, two-dimensional image formation, and straightforward fabrication techniques, unique among all nanophotonic approaches. We show that the conventional Laplacian-based transmission spectrum may not be ideal once the scattering physics of real designs is considered, and show that better performance can be attained with alternative spatial filter functions. Our designs, comprising alternating layers of Si and SiO2 with total thicknesses of only , demonstrate the possibility for optimized multilayer films to achieve state-of-the-art edge detection, and, more broadly, analog optical implementations of linear operators.

Development of Knowledge-Based Engineering System for Structural Size Optimization of External Fixation Device

The development process of the knowledge-based engineering (KBE) system for the structural size optimization of external fixation device is presented in this paper. The system is based on algorithms for generative modeling, finite element model (FEM) analysis, and size optimization. All these algorithms are integrated into the CAD/CAM/CAE system CATIA. The initial CAD/FEM model of external fixation device is verified using experimental verification on the real design. Experimental testing is done for axial pressure. Axial stress and displacements are measured using tensometric analysis equipment. The proximal bone segment displacements were monitored by a displacement transducer, while the loading was controlled by a force transducer. Iterative hybrid optimization algorithm is developed by integration of global algorithm, based on the simulated annealing (SA) method and a local algorithm based on the conjugate gradient (CG) method. The cost function of size optimization is the minimization of the design volume. Constrains are given in a form of clinical interfragmentary displacement constrains, at the point of fracture and maximum allowed stresses for the material of the external fixation device. Optimization variables are chosen as design parameters of the external fixation device. The optimized model of external fixation device has smaller mass, better stress distribution, and smaller interfragmentary displacement, in correlation with the initial model.

Analysis of Modular Design Applicable in Prosumer Scope. Guideline in the Creation of a New Modular Design Model

Modular design is the design based on independent and connectable modules to achieve product variety. It is an ideal tool that could facilitate the inclusion of prosumers in the creative process. However, its evolution has focused on product development and not on end users. The creation of a new modular design model for prosumers could respond to their needs while exploiting the advantages of modularity. The present work analyzes the applicability of modular design in the prosumer scope and defines a guideline for the creation of the new model. To this end, prosumer and modular design methods are collected and analyzed throughout the previously defined design process. The intersection between both terms is analyzed through a series of real cases and design methods that show what the objectives of prosumers are and if the present products and methods meet their needs. These results will establish the current and potential link between modular design and prosumers. Finally, the objectives and stages to develop the design model based on previous results are presented. The paper presents relevant findings such as the lack of methods in the conceptual design phases and a guideline to ensure that the prosumer benefits from modular design.

A Comprehensive Evaluation Method for Air-Conditioning System Plants Based on Building Performance Simulation and Experiment Information

During the design stage of an HVAC (heating, ventilation, and air conditioning) system in a construction project, designers must decide on the most workable design scheme for the plant room in the building based on the evaluation of multiple aspects related to system performance that need to be considered, such as energy efficiency, economic effectiveness, etc. To solve this problem, this paper proposes a comprehensive evaluation method for the plant rooms of centralized air-conditioning systems in commercial buildings. This new method consists of two analyses used in tandem: Building Performance Simulation (BPS) models and a collection of real HVAC design cases (the carried-out design solutions). The BPS models and a knowledge of the reduction approach based on Rough Set (RS) theory are used to generate data and weight factors for the indices of energy efficiency; and the real design cases are employed with a heuristic algorithm to extract the compiled empirical information for other evaluation items of the centralized HVAC system. In addition, this paper also demonstrates an application in an actual case of a building construction project. By comparing the expert decision-making process and the evaluation results, it is found that they are basically consistent, which verifies the reasonability of the comprehensive evaluation method.

Robust mixed performance of uncertain switched systems with interval time‐varying delay by synchronous switching on signal and sampled‐data input

AbstractThe real time switching signal design and control input are developed to guarantee the passivity and performance of switched systems with interval time‐varying delay and linear fractional perturbations. For the difficulty in real time switching, a synchronous switching on signal and sampled‐data control based on sampling instant is proposed to achieve the mixed performance (passivity/H2) of system under consideration. On the other hand, the sampled‐data controls under arbitrary switching are also considered for the capture anytime and at sampling instant of switching signal, respectively. The proposed LMI conditions can be implemented numerically by Matlab toolbox. Full matrix formulation approach is used to present the main results and improve the conservativeness of the published results. New inequality and Lyapunov–Krasovskii functional are developed to achieve better proposed results in this article. Finally, some numerical examples are illustrated to show the use of our main results.

Management of Cytomegalovirus, Epstein-Barr Virus, and HIV Viral Load Quality Control Data Using Unity Real Time.

ABSTRACTQuality control (QC) rules (Westgard rules) are applied to viral load testing to identify runs that should be reviewed or repeated, but this requires balancing the patient safety benefits of error detection with the cost and inefficiency of false rejection. In this study, we identified the total allowable errors (TEa) from the literature and utilized a commercially available software program (Unity Real Time; Bio-Rad Laboratories) to manage QC data, assess assay performance, and provide QC decision support for both FDA-approved/cleared (Abbott cytomegalovirus [CMV] and HIV viral load) as well as laboratory-developed (Epstein-Barr virus [EBV] viral load) assays. Unity Real Time was used to calculate means, standard deviations (SDs), and coefficient of variation (CV; in percent) of negative, low-positive, and high-positive control data from 73 to 83 days of testing. Sigma values were calculated to measure the test performance relative to a TEa of 0.5 log10. The sigma value of 5.06 for EBV predicts ∼230 erroneous results per million individual patient tests (0.02% frequency), whereas sigma values of >6 for CMV (11.32) and HIV (7.66) indicate <4 erroneous results per million individual patient tests. The Unity Real Time QC Design module utilized these sigma values to recommend QC rules and provided objective evidence for loosening the laboratory’s existing QC rules for run acceptability, potentially reducing false rejection rates by 10-fold for the assay with the most variation (EBV viral load). This study provides a framework for laboratories, with Unity Real Time as a tool, to evaluate assay performance relative to clinical decision points and establish optimal rules for routine monitoring of molecular viral load assay performance.

FEATURES OF THE ADAPTATION OF 3D PRINTED REGENERATIVE COOLING CHANNELS OF THE LPRE THROAT INSERTS

For modern LPREs there is a general tendency to find new approaches to decrease manufacturing costs as well as increasing engine efficiency. This is grounded on the fact that classically, the design of LPRE components represents assemblies which consist of several complex parts joined together by means of specific technological processes. Particularly, throat inserts production often requires advanced machining of both inner wall and chamber jacket which are brazed to ensure the integrity of the obtained part. One of the possible ways to simplify the complex manufacturing technology of the throat inserts is the application of additive manufacturing methods. For instance, SLM (Selective Laser Melting) technology allows to partly exclude complex machining, welding and brazing from production cycle of the throat inserts. As a result, classically manufactured assembly transforms into single 3D-printed part and consequently, this has positive impact on system reliability while the time expenses reduce significantly.&#x0D; The possibility of using the additive printing process for the manufacture of throat inserts of liquid-propellant rocket engines is investigated in this paper. A design was chosen for comparison based on the analysis of existing typical real designs of liquid-propellant rocket engines. The designs of the throat inserts are to be manufactured by means of SLM technology. Several 3D models with varying geometry features of cooling channels were designed. The obtained results made it possible to analyze new metal throat inserts of the liquid-propellant engines and compare them with those which were manufactured using traditionally used technologies. Comparative analysis allows us to study the main features of the SLM-manufacturing of the throat inserts of the liquid-propellant engine and propose the main ways of adaptation of the geometry of the cooling channels while taking into account the technological limitations of the chosen additive manufacturing method.

Investigation and Quantification of Irreversible Degradations and Their Sensitivities during the Start-up Phases of PEMFC By an Accelerated Emulation Approach

In automotive application, frequent Start-up/Shut-down (SU/SD) phases of PEMFC system are prone to cause severe degrading conditions. Many studies have been achieved over the past decades to better understand and to mitigate MEA aging and performance decay due to the well-identified reverse current mechanism1. Indeed, the H2|Air front during H2 injection at the air-filled anode creates two sub-cells: H2/Air sub-cell operating in Fuel Cell mode and Air/Air sub-cell operating in Electrolysis Cell mode. This second sub-cell is subjected to high potential at cathodic side (about 1.6 V vs RHE), leading to harsh corrosion of both Pt nanoparticles and carbon support within the cathode catalyst layer. Two main mitigating solutions are generally proposed in the literature: (i) development of more stable materials and (ii) improvement of system control 2,3. Experimental DOE AST4 is usually performed only on small single cell to evaluate MEA component durability. Nevertheless, these tests cannot be fully correlated with real automotive operating conditions to predict PEMFC stack lifetime.In this work, more realistic AST protocols in regard to PEMFC stack/system configuration during start-up phase are proposed. Our experimental approach consists in emulating a representative transient cathodic potential profile (Figure a and b) during the H2|Air front formation and propagation along anodic channel using a 100 cm² single cell with a real stack active area design5. A comprehensive investigation and quantification of degradations caused by reverse current was carried out under SU cycling. Additional sensitivity study on the main operating parameters (potential profile, relative humidity and temperature) was performed to evaluate their respective impact on the cathode degradation and the performance losses. Periodic measurements such as polarization curves and cyclic voltammetry (Figure c) are coupled with CO/CO2 gas emission analysis (Figure d) during cycling at cathode to monitor and quantify the physical and electrochemical modifications within the MEA during our aging SU cycles.On the whole, this original experimental study proposes an overall degradation mechanism and these results are compared with model prediction to validate the most impactful parameters during reverse current phases at the real cell size and design. Ultimately, it will provide key-data to propose and optimize finely different mitigation strategies to be used in PEMFC stack and systems. References Reiser, C. A. et al. A reverse-current decay mechanism for fuel cells. Electrochemical and Solid-State Letters 8, A273–A276 (2005).Zhang, T., Wang, P., Chen, H. & Pei, P. A review of automotive proton exchange membrane fuel cell degradation under start-stop operating condition. Applied Energy 223, 249–262 (2018).Yu, Y. et al. A review on performance degradation of proton exchange membrane fuel cells during startup and shutdown processes: Causes, consequences, and mitigation strategies. Journal of Power Sources 205, 10–23 (2012).Fuel Cell Tech Team Accelerated Stress Test and Polarization Curve Protocols for PEM Fuel Cells. Energy.gov https://www.energy.gov/eere/fuelcells/downloads/fuel-cell-tech-team-accelerated-stress-test-and-polarization-curve.Randrianarizafy, B. Multi-physics modeling of startup and shutdown of a PEM fuel cell and study of the carbon support degradation : mitigation strategies and design optimization. (Université Grenoble Alpes, 2018). Figure 1

Application of alginate immobilized microalgae in treating real food industrial wastewater and design of annular photobioreactor: A proof-of-concept study

Microalgae immobilization was widely studied to address the challenge of algal cells harvesting, however, its stability and efficiency in treating real food industrial wastewater has not been well studied. In this study, microalgae were co-immobilized with sludge bacteria in alginate beads for treatment of real meat processing wastewater and an annular photobioreactor was designed to facilitate efficient light transmission at high beads-to-wastewater ratios. Results showed that increasing alginate mixture from 1.25% to 2.00% (w/v) extended beads stability in real wastewater from three to seven days. When beads were suspended in wastewater the overshading effect at beads-to-wastewater ratio of 20% (v/v) was significant and average algal growth (0.17 mg/bead) was lower than 2% (0.46 mg/bead) and 5% (0.36 mg/bead). Nevertheless, the ratio of 20% (v/v) was preferred as the higher beads count may compensate the disadvantage, however, the light transmission efficiency needed to be improved. The effect of environmental temperature indicated that at 37 °C beads started rupturing after three-days treatment due to the excessive growth of immobilized microorganisms. In comparison with suspended photobioreactor, in improved annular photobioreactor algal growth increased from 1412.6 to 3191.0 mg/L and removal of chemical oxygen demand (COD) and total nitrogen (TN) were improved from 78.5 to 82.9% and from 68.5 to 84.4% respectively with 89.4% total phosphate (PO43−) being removed. By the end of treatment, 135.9 mg/L TN and 99.2 mg/L total PO43− were removed and it was speculated that most of nitrogen and phosphorus were removed by algal assimilation rather than the physical adsorption of alginate gel. Findings of this study provided directions for the application of immobilized microalgae in the real world.

Simulation Model Based Real Time Analysis and Design for Single Secondary Particle

When the LiFePO4 (LFP) was developed for an active material of lithium-ion batteries, the specific capacity is 100 ~ 110 mAh g-1, which is not competitive compared to other active materials such as LiCoO2 (LCO) for lithium-ion batteries. Because the electrochemical properties including diffusion coefficient and electric conductivity are relatively low. To overcome the limitations, the carbon was coated at the particle surface and the secondary particle composed of millions of nano-sized primary particles was used, so the 150~160 mAh g-1 was accomplished, which is close to theoretical capacity 170 mAh g-1. This dramatic improvement inspires the importance of particle-level studies.A single particle measurement research of active materials was reported first in 1999, which measures single particle properties by direct contact of tens of micron diameter gold or platinum filament to a single particle. This research has difficulty to cover all of the electrochemical properties of a single particle according to particle design because it takes a lot of time for direct contact between the particles and filaments and dropping particles and filaments even under minute vibrations. Moreover, the gold or platinum filament are expansive and difficult to reuse for other materials.In this study, we developed a simulation model for analysis of electrochemical properties inside of a particle and designing particles. Voltage profiles according to the C-rate obtained by simulation and experiment was compared and the model was verified. And the properties of the particle (State of Lithiation, Overpotential, Potential, Concentration) were analyzed in real time in 1D, 2D and 3D. Finally, the electrochemical performance of particles was evaluated for the design parameters (secondary particle size, Primary particle size, porosity).

Research of the efficiency of using the Miller cycle of an internal combustion engine

The article is devoted to the study of the possibilities of improving the technical and economic indicators of an internal combustion engine (ICE) through the use of the Miller cycle with a shortened intake. A review of scientific works on the use of the Atkinson cycle and Miller cycle in an internal combustion engine is carried out. A comparative analysis of theoretical cycles: Otto cycle, Atkinson cycle and Miller cycle is carried out. Calculated studies of the influence of the expansion ratio and the pressure increase ratio on the efficiency of the Atkinson cycle have been carried out. The ratios are presented that allow using the Miller cycle with a short inlet to obtain the same theoretical efficiency of the cycle as that of the Atkinson cycle. At the same time, the implementation of the Miller cycle in a real engine design significantly exceeds the possibilities of using the Atkinson cycle. The results of the study showed that the use of the Miller cycle with a shortened intake is preferable, but it must necessarily increase the compression ratio and intake pressure through the use of boost. On the example of real data of the main parameters of the cycle, it is shown that the use of the theoretical Miller cycle can provide a significant up to 12.2% increase in the efficiency of the cycle compared to the Otto cycle. The ratios, conditions and recommendations are presented that allow the effective use of the Miller cycle with a shortened intake in a real engine design.

You keep using that term, I do not think it means what you think it means: variable-air-volume terminal box catalog noise criteria data and what AHRI Standard 885 really says

Mechanical Engineers often include Noise Criteria data on equipment schedules for variable-air-volume terminal boxes. This can lead to confusion when acousticians recommend noise control interventions, as the catalog data leads the Engineer to believe they have selected appropriately quiet equipment. This session will review how Noise Criteria catalog ratings are determined according to AHRI Standard 885 and compare the Standard assumptions versus real world designs. Multiple design cases will be presented to show the pitfalls of relying on equipment catalog Noise Criteria ratings.