Typical Layout Research Articles

Optimization of sensor deployment sequences for hazardous gas leakage monitoring and source term estimation

Nowadays, chemical safety has attracted considerable attention, and chemical gas leakage monitoring and source term estimation (STE) have become hot spots. However, few studies have focused on sensor layouts in scenarios with multiple potential leakage sources and wind conditions, and studies on the risk information (RI) detection and prioritization order of sensors have not been performed. In this work, the monitoring area of a chemical factory is divided into multiple rectangles with a uniform mesh. The RI value of each grid node is calculated on the basis of the occurrence probability and normalized concentrations of each leakage scenario. A high RI value indicates that a sensor at a grid node has a high chance of detecting gas concentrations in different leakage scenarios. This situation is beneficial for leakage monitoring and STE. The methods of similarity redundancy detection and the maximization of sensor RI detection are applied to determine the sequence of sensor locations. This study reveals that the RI detection of the optimal sensor layout with eight sensors exceeds that of the typical layout with 12 sensors. In addition, STE with the optimized placement sequence of the sensor layout is numerically simulated. The statistical results of each scenario with various numbers of sensors reveal that STE is affected by sensor number and scenarios (leakage locations and winds). In most scenarios, appropriate STE results can be retained under the optimal sensor layout even with four sensors. Eight or more sensors are advised to improve the performance of STE in all scenarios. Moreover, the reliability of the STE results in each scenario can be known in advance with a specific number of sensors. Such information thus provides a reference for emergency rescue.

Automatic Generation Construction Shop Design Model of the MEP Hanger Based on BIM

Due to the growing complexity of mechanical, electrical and plumbing (MEP) functions, the design, production and installation of hanger based on MEP has become low efficiency in traditional ways. Compared with the Computer-Aided Design (CAD) approach, the MEP hanger three-dimensional (3D) design approach has not received adequate attention in the process of engineering practice. Based on Building Information Modeling (BIM) and Revit secondary development technology, an automatic generation construction shop design model system of MEP hanger (MEP hanger-CDM) for the quick placement of hanger components, automatic grouping of hanger components and hanger component constructability checking was developed. By conducting investigations with the construction companies and construction sites in China, four basic forms of MEP hanger layouts were identified to accommodate different types of MEP layouts. In addition, the design requirements of the family of LOD 400 BIM models were summarized along with the analysis of user requirements. The results of the case studies indicate a 70% reduction in the manpower number on the MEP hanger shop design and an 85.9% reduction in the number of working hours. Moreover, the efficiency of the hanger construction model design and the accuracy of the output of material lists and shop drawings could be improved. Thus, the process of designing MEP hanger could be optimized in a visualized method.

INFLUENCE ANALYSIS OF THE DIFFERENT TYPES BUS BODY COMPOSITION ON THE CHARACTERISTICS OF THE AIR FLOWS FORMATION IN CONDITIONS OF FORCED CABIN CONVECTION

The paper proposes the influence analysis of five types of city bus body layouts on the air flows formation in the cabin, generated by the motor compartment fan under conditions of forced convection. The authors conducted three types of tests with different boundary conditions in the finite element calculation module of ANSYS Fluent: the input velocity of the flows from the motor compartment fan, the temperature of the flows and the environment, internal and external convection. According to the results of simulated field tests, it was established that the most effective is the layout of the bus with the engine located horizontally in the rear overhang. Such a layout is relatively expensive from the point of view of production, because it requires the installation of the opposite type of "boxer" engine in most cases, which is characterized by a higher cost, complexity of maintenance and is less common in contrast to V-type internal combustion engine schemes. However, air circulation occurs throughout the cabin the most effectively in this layout scheme, taking into account the driver's cabin and other locations. Layouts with central positioning of the engine (vertical and horizontal) also deserve attention - they ensure a symmetrical distribution of air in the front and rear of the bus body, which can be especially relevant in the cold period of the year.

Layout of MOS Varactor with Improved Quality Factor for Cross-Coupled Differential Voltage-Controlled Oscillator Applications

In this study, we designed an MOS varactor for application in the differential voltage-controlled oscillator (VCO). To improve the quality factor of the MOS varactor, we proposed a symmetric layout technique of the MOS varactor with reduced parasitic components. Compared with the typical MOS varactor layout, the metal line for the interconnection of the MOS varactors that is inevitable in the typical MOS varactors for the cross-coupled VCO was minimized to reduce the parasitic resistance. In addition, with the reduced interconnection metal line, the overall size of the proposed MOS varactor was also reduced compared with the typical one. To verify the feasibility of the proposed MOS varactor structure, the typical and proposed MOS varactors were designed using a 180 nm RFCMOS process. Compared to the typical MOS varactor, the measured quality factor of the proposed MOS varactor was improved by approximately 32% at the operating frequency of 5.0 GHz. Additionally, we successfully verified that the parasitic capacitance induced by the lossy silicon substrate was reduced in the proposed MOS varactor structure.

Automated design of freeform imaging systems for automotive heads-up display applications.

The freeform imaging system is playing a significant role in developing an optical system for the automotive heads-up display (HUD), which is a typical application of augmented reality (AR) technology. There exists a strong necessity to develop automated design algorithms for automotive HUDs due to its high complexity of multi-configuration caused by movable eyeballs as well as various drivers' heights, correcting additional aberrations introduced by the windshield, variable structure constraints originated from automobile types, which, however, is lacking in current research community. In this paper, we propose an automated design method for the automotive AR-HUD optical systems with two freeform surfaces as well as an arbitrary type of windshield. With optical specifications of sagittal and tangential focal lengths, and required structure constraints, our given design method can generate initial structures with different optical structures with high image quality automatically for adjusting the mechanical constructions of different types of cars. And then the final system can be realized by our proposed iterative optimization algorithms with superior performances due to the extraordinary starting point. We first present the design of a common two-mirror HUD system with longitudinal and lateral structures with high optical performances. Moreover, several typical double mirror off-axis layouts for HUDs were analyzed from the aspects of imaging performances and volumes. The most suitable layout scheme for a future two-mirror HUD is selected. The optical performance of all the proposed AR-HUD designs for an eye-box of 130 mm × 50 mm and a field of view of 13° × 5° is superior, demonstrating the feasibility and superiority of the proposed design framework. The flexibility of the proposed work for generating different optical configurations can largely reduce the efforts for the HUD design of different automotive types.

Hexagonal-Grid-Layout Image Segmentation Using Shock Filters: Computational Complexity Case Study for Microarray Image Analysis Related to Machine Learning Approaches

Hexagonal grid layouts are advantageous in microarray technology; however, hexagonal grids appear in many fields, especially given the rise of new nanostructures and metamaterials, leading to the need for image analysis on such structures. This work proposes a shock-filter-based approach driven by mathematical morphology for the segmentation of image objects disposed in a hexagonal grid. The original image is decomposed into a pair of rectangular grids, such that their superposition generates the initial image. Within each rectangular grid, the shock-filters are once again used to confine the foreground information for each image object into an area of interest. The proposed methodology was successfully applied for microarray spot segmentation, whereas its character of generality is underlined by the segmentation results obtained for two other types of hexagonal grid layouts. Considering the segmentation accuracy through specific quality measures for microarray images, such as the mean absolute error and the coefficient of variation, high correlations of our computed spot intensity features with the annotated reference values were found, indicating the reliability of the proposed approach. Moreover, taking into account that the shock-filter PDE formalism is targeting the one-dimensional luminance profile function, the computational complexity to determine the grid is minimized. The order of growth for the computational complexity of our approach is at least one order of magnitude lower when compared with state-of-the-art microarray segmentation approaches, ranging from classical to machine learning ones.

Effect of urban neighbourhood layout on the flood intrusion rate of residential buildings and associated risk for pedestrians

Urban neighbourhood layouts affect the flood intrusion rate towards residential buildings through various kinds of damaged openings (doors, windows, gates and shafts) and the associated risk for pedestrians within the urban building complex and ultimately the safety of indoor and outdoor pedestrians in urban flooding events. This study adopts computational fluid dynamics (CFD) to quantify the flood intrusion discharge towards residential buildings and evaluate the flood hazard rating of pedestrians within urban areas of divergent configurations in conjunction with a laboratory flume experiment regarding the stability/instability behaviour of a dummy model that represents a human body in a quasi-natural state. Five types of urban building layouts with three different building densities under three various floodwater conditions, including a determinant type A (see the graphic abstract hereafter), a point group type B, an enclosed type C, a hybrid type D and a new hybrid type E, are examined. The results show that the determinant type A and hybrid type D have a similar trend in terms of the flood intrusion discharge distributions towards each row of buildings and discharge variation with respect to urban building spacing, whereas other urban layouts exhibit different characteristics. Strong floodwater leads to an increased flood risk for pedestrians both outdoors and even indoors within various urban configurations: pedestrians are the most prone to toppling instability on the streets, in turn, behind the building and within the interior of the building. For both determinant type A and hybrid type D, the more pedestrians lie behind the building approaching the upstream, the safer the pedestrians become, while for point group type B, enclosed type C and new hybrid type E, the trend is reversed. The experimental results also offer a novel valuable dataset for the validation of other urban flooding numerical models. This study could be referred to by local authorities and stakeholders to take effective measures to improve the safety of pedestrians and mitigate flood risk in the context of urban planning and urban flood emergency management, such as strengthening flood-resilient urban facility designs and devising optimal routines for emergent evacuation of outdoor pedestrians.

Spatial distributions of airborne transmission risk on commuter buses: Numerical case study using computational fluid and particle dynamics with computer-simulated persons.

Commuter buses have a high passenger density relative to the interior cabin volume, and it is difficult to maintain a physical/social distance in terms of airborne transmission control. Therefore, it is important to quantitatively investigate the impact of ventilation and air-conditioning in the cabin on the airborne transmission risk for passengers. In this study, comprehensive coupled numerical simulations using computational fluid and particle dynamics (CFPD) and computer-simulated persons (CSPs) were performed to investigate the heterogeneous spatial distribution of the airborne transmission risk in a commuter bus environment under two types of layouts of the ventilation system and two types of passenger densities. Through a series of particle transmission analysis and infection risk assessment in this study, it was revealed that the layout of the supply inlet/exhaust outlet openings of a heating, ventilation, and air-conditioning (HVAC) system has a significant impact on the particle dispersion characteristics inside the bus cabin, and higher infection risks were observed near the single exhaust outlet in the case of higher passenger density. The integrated analysis of CFPD and CSPs in a commuter bus cabin revealed that the airborne transmission risk formed significant heterogeneous spatial distributions, and the changes in air-conditioning conditions had a certain impact on the risk.

With a Long Connecting Pipe Surge Hydraulic Characteristics Research

The Downstream Surge Chamber of a pumped storage power station adopts impedance with an upper chamber layout. The tailrace tunnel is connected with the connecting pipe through a right-angle bifurcated pipe and bend. The layout type is special and the water flow conditions are complex. To study its hydraulic characteristics, a three-dimensional flow field mathematical model of the connecting pipe at the bottom of the surge chamber is established, and the variation law of hydraulic characteristics under different diversion ratios and confluence ratios is studied. The results show that for the resistance loss of the surge chamber with the complex bottom flow, the three-dimensional numerical simulation can achieve a better simulation effect, and the calculation results are in good agreement with the theoretical analysis results. Because the elbow is at the bottom of the surge chamber, the sudden expansion and contraction between the connecting pipe and the big well will cause additional hydraulic losses, its head loss coefficient is greater than that of the conventional impedance surge chamber, and the flow coefficient is smaller than that of the separate impedance hole.

Automatic generation of scientific papers for data augmentation in document layout analysis

Document layout analysis is an important task to extract information from scientific literature. Deep-learning solutions for document layout analysis require large collections of training data that are not always available. We generate a large number of synthetic pages to subsequently train a neural network to perform document object detection. The proposed pipeline allows users to deal with less common layouts for which it is not easy to find large annotated datasets. High-quality annotations for a small collection of papers are obtained through a semi-automatic approach. Then, a generative model, based on LayoutTransformer, is used to generate plausible layouts that are subsequently populated with random information to perform data augmentation. We evaluate the proposed method considering scientific articles with two different types of layouts: double and single columns. For double-column papers, we improve detection by 1% starting from 385 manually annotated scientific articles. For single-column papers, we improve detection by 49% starting from 218 articles.

An Overview of the Codes and Conventions of Drama Film Music

This article is, a part of a larger chapter, which treats the analysis of also other drama soundtracks , with various plots, directing visions and kinds of typologies in order to draw a line between the conventions and codes in music. Still, it is hard, since the final result is mostly an eclecticism between program music, large types of audio layouts, applied accordingly to the script and the personal craft of the composer. I identified some general approaches in drama film music, such as: the large usage of strings, or the highlight of melodic parameter, the minor keys and so on. I believe, for a composer it is essential to know the tools one needs to choose before writing music for a film. Even more, the codes found in an soundtrack are necessary because of the fact that they „talk” about the composer s style, his trademark.

Promoting Agritourism in Poland with Ready-Made Digital Components and Rustic Cyberfolklore

Online content can have unique cultural value. It is certainly the case for digital representations of folklore found on websites related to rural tourism, including agritourism. It is true for both archaic websites, copies of which are found in digital archives, and modern websites. The purpose of this paper is to assess the frequency of ready-made digital components and rustic folklore on agritourism farms’ websites. The exploration and comparative analysis involved 866 websites from two independent sets: (1) archaic websites, copies of which are available in the Internet Archive and (2) currently operational websites published in the Polish ccTLD (country code top-level domain). We employed HTML code exploration to verify the websites’ development technique and their selected characteristics, including content management systems (CMSs) and responsiveness. In the set of the ccTLD websites, we recorded such design attributes as the type of graphic layout, hero image, and parallax scrolling. The research demonstrated that ready-made folklore graphics were relatively rare among the investigated websites. Elements of rustic cyberfolklore were found only on 17 archaic websites (approx. 4%) and 52 ccTLD websites (approx. 12%). They were most often Kashubian patterns. The research suggests that rustic cyberfolklore is most often found on websites of agritourism farms in areas where local communities and ethnic groups are particularly active and strongly identify with regional traditions.

Classification of typical layout design for Indonesian apartment buildings

Along with rapid urbanization, housing development increased in major cities worldwide. Public and private apartments have been constructed rapidly in Indonesia to accelerate housing provision, particularly in urbanized areas of major cities. From the early era of apartment construction to the present, many design prototypes have been implemented for various specific purposes such as energy-saving. Nevertheless, no comprehensive study has determined a typical layout of apartment buildings in Indonesia. The typical layout design is useful as the base model for building simulations. This study sought to classify the typical layout design of public and private apartments in Indonesia, using the selected building drawing data ranging from 1986 to 2021. We obtained primary data consisting of 268 public apartments from 22 cities and 268 private apartments from 9 major cities in Indonesia. To determine the typical layouts, both qualitative and quantitative analyses were conducted. As a result of this study, a pair of typical public and private apartment buildings which include the 1-bedroom unit and 2-bedroom unit types have been selected as the typical layout of the Indonesian apartment building. The results of the typical layout classification could be utilized as a standard testing model for designing future apartment building prototypes.

Influence of buildings’ height and density on climatic indicators of urban environment

The height of buildings and the layout of territories are among the factors influencing various climatic conditions of the city. This area of research is relevant, given the current trend of urbanization of spaces. The conditions formed during the construction and further operation of cities have a significant impact on the condition of a person living in this territory. Also, an important factor is the coverage of the road network. The correctness of the choice of approach to building does not always occur with the accuracy with which it should, which leads to various deviations. There are different types of territory layout: compact, free, group, and mixed. When considering the height of buildings, there are such types as low-rise, medium-rise and high-rise buildings. The city of Krasnodar has historical prerequisites for low-rise buildings, no higher than the crowns of trees. However, with the development of the city, this arrangement of the territory changed to a high-rise one, which affected various living conditions of people. The type of building and the roadbed also affect the temperature regime of the city, as a result of which various deviations from the norms may occur. In the city of Krasnodar, various thermal anomalies are observed due to the heterogeneity of the building. When studying the city's territories and temperature data, various deviations are traced, thanks to which it is clear that in areas with low buildings the temperature is more comfortable for a person, which cannot be said about other areas where taller buildings prevail. It has been established that when studying biospheric conditions on the territory of the city of Krasnodar, the most suitable type of layout is free, and low-rise buildings have a more positive effect on the climate than other types.

Survey method for field measurement of rubber ball impact sound in reinforced concrete apartment houses in Korea – Based on the Korean measurement method

The rubber ball impact sound has been standardized by ISO 10140 series and ISO 16283-2 for laboratory and field measurements, respectively. The ISO 10052 standard specifies a survey method for the impact sound measurement using a tapping machine and a rubber ball. This study proposed measurement position for the survey method which is highly correlated with result based on the Korean Standards (KS) and the building regulation of South Korea for engineering method. The rubber ball impact sounds were measured in 79 reinforced concrete apartment houses, which have a centre point and four perimeter points for both exciting and receiving sounds. The proposed survey method was validated for only a specific type of apartment building layout and construction in the South Korean environment. The excitation and receiving points in the perimeter having the most similar characteristics to the results obtained using the Korean engineering methods were first selected. By combining the selected perimeter point and centre point for both the excitation and receiving sounds, the characteristics of each combination were compared with the results obtained using the Korean engineering method. When one excitation point or receiving point in the perimeter was added to the centre point for the proposed survey method, the difference between the measurement result using the engineering and proposed survey method decreased. The standard deviation of the difference between the SNQs of the proposed survey method and the Korean engineering method for measuring the rubber ball impact sound was smaller than 2 dB.

Methodology for determining technical, economic and environmental performance of combined power plants

Consideration of the feasibility of building combined power plants (CPP) based on renewable energy sources (RES) and the choice of parameters, type of equipment, layout, and design solutions is based on an assessment of economic efficiency, the indicator of which is the ratio between the required investments and the achieved technical and economic effect. An accurate assessment of economic efficiency is a rather difficult task since it is necessary to take into account a large number of factors, for example, specific features of design solutions, operating conditions of the CPP depending on the requirements of the consumer, the stochastic nature of the manifestation of energy resources, the possible mode of operation of the CPP for the needs of individual consumers and others. An approach based on the minimum cost criteria has been widely used for the economic justification of the objects under construction for a long time. In rigidly centralized economic management, such an approach based on ensuring optimal construction planning played an important role in increasing the scientific validity of economic decisions. It proceeded from the global and national economic goals of economic development. In the conditions of a free market economy, a method of evaluating the effectiveness of taking into account all the main features of it is necessary.

Optimization of Radiation Shielding Considerations for Designing Halcyon Vault.

To determine the radiation shielding considerations for optimization of Halcyon vault shielding requirements. The primary and leakage workloads were estimated using actual clinical treatment planning and treatment delivery data acquired from three busy operational clinical Halcyon facilities. The effective use factor was determined based on a newer approach proposed in this paper using the percentage of patients treated with different treatment techniques. The transmission factor of the primary beam block, maximum head leakage, and patient scatter fractions around the Halcyon machine were experimentally determined. The first tenth-value layer (TVL1) and equilibrium tenth-value layer (TVLe) for 6 MV - flattening-filter-free (FFF) primary X-ray beam for ordinary concrete were measured. The primary and leakage workloads are estimated as 1 × 105 cGy/wk and 3.1 × 105 cGy/wk at 1 m respectively. The effective use factor is found as 0.114. The primary beam-block transmission factor is determined as 1.7 × 10-4 at 1 m distance from isocenter along the central beam axis. The maximum head leakage is noted as 6.23 × 10-4. The patient scatter fractions are reported for various planar angles around the Halcyon machine at a radial distance of 1 m in a horizontal plane passing through isocenter. The TVL1 and TVLe of 6 MV-FFF X-ray beam energy for ordinary concrete are found to be 33 and 29 cm, respectively. Using experimentally determined shielding considerations, the optimized vault shielding requirements for the Halcyon facility are calculated and a typical layout drawing is proposed.

Indoor Camera Pose Estimation from Room Layouts and Image Outer Corners.

To support indoor scene understanding, room layouts have been recently introduced that define a few typical space configurations according to junctions and boundary lines. In this paper, we study camera pose estimation from eight common room layouts with at least two boundary lines that is cast as a PnL (Perspective-n-Line) problem. Specifically, the intersecting points between image borders and room layout boundaries, named image outer corners (IOCs), are introduced to create additional auxiliary lines for PnL optimization. Therefore, a new PnL-IOC algorithm is proposed which has two implementations according to the room layout types. The first one considers six layouts with more than two boundary lines where 3D correspondence estimation of IOCs creates sufficient line correspondences for camera pose estimation. The second one is an extended version to handle two challenging layouts with only two coplanar boundaries where correspondence estimation of IOCs is ill-posed due to insufficient conditions. Thus the powerful NSGA-II algorithm is embedded in PnL-IOC to estimate the correspondences of IOCs. At the last step, the camera pose is jointly optimized with 3D correspondence refinement of IOCs in the iterative Gauss-Newton algorithm. Experiment results on both simulated and real images show the advantages of the proposed PnL-IOC method on the accuracy and robustness of camera pose estimation from eight different room layouts over the existing PnL methods. The code is available at https://github.com/XiaoweiChenOSU/PnL-IOC.

ANALYSIS OF NEW TECHNICAL SOLUTIONS FOR THE RITM-200 REACTOR PLANT IN THE PROJECT 22220 OF UNIVERSAL NUCLEAR ICEBREAKERS

The project 22220 of a new two-stage universal nuclear icebreaker involves the construction of 5 similar icebreakers to work in the Arctic. At the same time, two icebreakers of this project are already in operation. RITM-200 reactor installations are installed on icebreakers. The main feature of these reactor installations (RI) is the monoblock layout of the main equipment. This type of layout should gradually replace existing since 1975 and a positively proven block layout of the reactor installation. To date, the development of new reactor installations is small and it is too early to talk about the practical results of their operation, but it is possible to discuss new technical solutions in the project. At the same time, there is a long experience in the operation of previous projects of nuclear icebreakers (10520, 10521, 10580) with a total operating time of about 400 reactor years. The received comprehensive information on the creation and operation of these facilities is a solid basis for comparing the technical solutions used on new universal nuclear icebreakers, including on the reactor installations. A methodology for comparing already known technical solutions for existing installations with new ones proposed by the designer is proposed in the paper. In this situation, the author acts as an independent expert with an assessment of the relative positivity of new technical solutions. At the same time, the assessment is carried out according to 6 comparison criteria developed on the basis of the analysis of the accompanying technical documentation on reactor installation developed by the Afrikantov OKBM. Six most important new integrated technical solutions for the modernization of the reactor installation for universal nuclear icebreakers are considered. Such an analysis is also important because an optimized power unit for low-power floating nuclear power plants is being developed on the basis of the design experience gained. As an energy source, two RHYTHM-200M steering wheels are used here. In addition, the RITM-400 reactor plant with a thermal capacity of 315 MW for the leader icebreaker with a capacity of 120 MW is conceptually similar to the RITM-200 and the differences are mainly due to increased thermal power and an increased number of energy loops while maintaining dimensions. The analysis has showed that the complexes of technical solutions mainly have a high relative positivity and take into account the latest scientific achievements and technology development.

Effects of Reading Text on an Optical See-Through Head-Mounted Display During Treadmill Walking in a Virtual Environment

This study evaluated the effects of reading text on an optical see-through head-mounted display during treadmill walking in a virtual environment. Thirty participants were recruited to perform Chinese reading tasks by reading six types of text layouts in two polarity settings. A virtual environment was displayed on a projection screen to simulate a walking situation in which obstacles were encountered. High- and low-density obstacles were applied. Objective measures included reading performance, gait variability, and the error count of obstacles. The subjective measures were the situational awareness rating technique (SART) and NASA-Task Load Index (NASA-TLX) scores. The results indicated that font size and polarity affected the gait variability, reading performance, situational awareness, and mental workload ratings. The obstacle density affects gait variability and situation awareness rating. The layout with 32-point text and positive polarity yielded faster reading speed, better subjective ratings, and less variability in minimum foot clearance.