Topic Modeling Using Latent Dirichlet allocation

We are not able to deal with a mammoth text corpus without summarizing them into a relatively small subset. A computational tool is extremely needed to understand such a gigantic pool of text. Probabilistic Topic Modeling discovers and explains the enormous collection of documents by reducing them in a topical subspace. In this work, we study the background and advancement of topic modeling techniques. We first introduce the preliminaries of the topic modeling techniques and review its extensions and variations, such as topic modeling over various domains, hierarchical topic modeling, word embedded topic models, and topic models in multilingual perspectives. Besides, the research work for topic modeling in a distributed environment, topic visualization approaches also have been explored. We also covered the implementation and evaluation techniques for topic models in brief. Comparison matrices have been shown over the experimental results of the various categories of topic modeling. Diverse technical challenges and future directions have been discussed.

Challenges Experienced in Distance Education and Solution Suggestions During the COVID-19 Pandemic Period

In this study, which was carried out in order to identify the challenges experienced in distance education during the COVID-19 pandemic period and to propose solutions to these problems, the phenomenology design was used. Twelve experts who had experience of distance education during the COVID-19 period contributed to the study. The findings obtained within the scope of the study show that there are challenges such as the unpreparedness of institutions, insufficient infrastructure, increased digital divide among learners, and difficulties in measurement-evaluation processes and support services processes during the pandemic period. Regarding the solution of these problems, solutions such as investing in infrastructure, revising support services, using teaching techniques suitable for distance education, taking responsibility in learning processes, and changing measurement-evaluation techniques have been presented.

Supercapacitors Fabrication and Performance Evaluation Techniques

Supercapacitors have surfaced as a promising technology to store electrical energy and bridge the gap between a conventional capacitor and a battery. This chapter reviews various fabrication practices deployed in the development of supercapacitor electrodes and devices. A broader insight is given on the numerous electrode fabrication techniques that include a detailed introduction, principles, pros and cons, and their specific applications to provide a holistic view. Key performance parameters of an energy storage device are explained in detail. A further discussion comprises several electrochemical measurement procedures that are used for the supercapacitor performance evaluation. The performance characterization section helps to determine the correct approach that should be utilized for supercapacitor device performance measurement and assessment.

Comparative Multi-Modal, Multi-Scale Residual Stress Evaluation in SLM 3D-Printed Al-Si-Mg Alloy (RS-300) Parts

SLM additive manufacturing has demonstrated great potential for aerospace applications when structural elements of individual design and/or complex shape need to be promptly supplied. 3D-printable AlSi10Mg (RS-300) alloy is widely used for the fabrication of different structures in the aerospace industry. The importance of the evaluation of residual stresses that arise as a result of the 3D-printing process’ complex thermal history is widely discussed in literature, but systematic assessment remains lacking for their magnitude, spatial distribution, and comparative analysis of different evaluation techniques. In this study, we report the results of a systematic study of residual stresses in 3D-printed double tower shaped samples using several approaches: the contour method, blind hole drilling laser speckle interferometry, X-ray diffraction, and Xe pFIB-DIC micro-ring-core milling analysis. We show that a high level of tensile and compressive residual stresses is inherited from SLM 3D-printing and retained for longer than 6 months. The stresses vary (from −80 to +180 MPa) over a significant proportion of the material yield stress (from −⅓ to ¾). All residual stress evaluation techniques considered returned comparable values of residual stresses, regardless of dramatically different dimensional scales, which ranged from millimeters for the contour method, laser speckle interferometry, and XRD down to small fractions of a mm (70 μm) for Xe pFIB-DIC ring-core drilling. The use of residual stress evaluation is discussed in the context of optimizing printing strategies to enhance mechanical performance and long-term durability.

Innovative Evaluation Techniques for Hanok Sustainability Based on Integrative Comfort Indices

This study aims to present integrative evaluation techniques that can assess spatial comfort reflecting the unique value of a vernacular building type in Korea called Hanok. For this purpose, current evaluation indices and methods of official standards for normal building performance were analyzed through previous studies, since any certified tools for Hanok evaluation do not exist. This situation has made relevant markets to be deactivated, although Hanok has valuable meanings as the traditional architecture to be succeeded to the next generation in Korea. Accordingly, specific assessment indices were derived to evaluate the Hanok sustainability especially focused on spatial comfort by using a qualitative field surveys with combined quantitative references. Then, actual resident data were collected from a series of Hanok testbeds for specific time-points including summer and winter solstices on the lunar-year system. As a result, resident data could be employed to reveal the characteristics of comfort performance from those target specimens, and show the tendency of the Hanok comfort by suggested innovative criteria for the market as a clue for its commercial potentials. Accordingly, it was concluded that the proposed techniques and indices could be certified for the Hanok evaluation and applied to the field of associated industries to show its specific values and advantages.

INSIGHT INTO ANTIMICROBIC EVALUATION TECHNIQUES AND THEIR ROLE IN BETTER ASSESSMENT OF ANTIMICROBIC AGENTS: A REVIEW

At present, researchers have a keen interest in creating advanced antimicrobic agents to overcome microbial resistance from various new sources either from plants or microbes. For this, robust attention has been given to the advancement in the rapid antimicrobic assessment strategies and methods to develop antimicrobic agents. Some of the antimicrobic techniques such as well diffusion using broth and agar and disc diffusion are more prominent in assaying antimicrobial testing while techniques such as bioluminescence, flow cytofluorometry methods are less used due to specific equipment’s, high calibration and evaluation processes. Thus, the information of precise antimicrobial techniques is must to the new researchers for antimicrobic testing. In this review article, various antimicrobic techniques with their advantages and limitations are being reported which are currently being carried out for antimicrobial testing.

Open- and Cased- Hole Formation Evaluation Workflows Running Together for Reducing Uncertainties in Gas Reservoirs: An Acquisition Data and Evaluation Strategy in Dnieper-Donets Basin, Ukraine

Formation evaluation using cased-hole logs is a primary option for re-evaluating old wells in brownfields or contingency logging in new wells. Its consistency with a robust open hole evaluation is vital for its future implementation in field development. This work describes detailed open- and cased- hole evaluation workflows integrating different advanced subsurface measurements and alternative interpretation techniques to reduce the uncertainties of deriving the main petrophysical properties across the conventional and tight gas reservoirs in the Dnieper-Donets basin. Since not all open-hole measurements can be recorded behind casing and some of the cased hole logs are not characterized for open hole conditions, it is not always possible to implement the same evaluation techniques for measurements done in open hole and cased hole. Nevertheless, different measurements provide different formation responses that supplement their gaps from one another. A wireline data acquisition strategy has been elaborated to carry out formation evaluation workflows using open- and cased-hole data independently but learning from each other. The methodology is based on novel and non-standard evaluation techniques that use measurements from advanced wireline technology such as nuclear magnetic resonance (NMR) and advanced pulsed neutron spectroscopy logs. The methodology was applied to log data recorded on the Visean and Serpukhovian (Lower Carboniferous) productive gas zones, characterized by porosity (5-15pu) and permeability (0.1-100mD). The principal challenge for the formation evaluation of these reservoirs is deriving an accurate estimation of porosity, which requires removing the gas and matrix effects on the log responses. An inaccurate porosity estimation will result in an inaccurate permeability and water saturation, and the problem worsens in low-porosity rocks. In the open hole, the porosity computation from the Density-Magnetic Resonance (DMR) technique has proven to be more accurate in comparison with common single porosity methods. The same problem is addressed in cased hole conditions with the advanced pulsed neutron spectroscopy logs and a novel technique that combines the thermal neutron elastic scattering and fast neutron cross sections to obtain a gas-free and matrix-corrected porosity, as well as a resistivity independent gas saturation. The consistency of petrophysical properties independently estimated from the two separate workflows add confidence to the approach, and this is reflected in the gas production obtained from the perforated intervals. This script describes in detail the open- and cased- hole formation evaluation workflows and the wireline technology and methodologies applied. Actual examples illustrate the effectiveness of these quantitative approaches in the Dnieper-Donets basin.

Development of Urban Community Through Creative Business Groups Towards Independent Village in Menteng Village Jekan Raya District Palangka Raya City

The purpose of this research is to find a strategy in developing Creative Business Groups in Menteng Village, precisely in the RT 05/RW XII environment and its surroundings. The group's efforts have been to recycle used tires into useful items, for example making flower pots and others, focusing on the environmental theme. Furthermore, mentoring is carried out because the group understands that they have potential in the field of business for the development of their group. They mobilize the community to join together in managing the business and its environment in collaboration with stakeholders (RT). The strategy used is to analyze pentagonal assets and determine asset advantages using the Orid Technique, which is then described in the program strategy analysis table (related to program potential, expectations, and plans). The summary of the agreed program is to strengthen group management and design development efforts for infrastructure development before the business is realized. The Asset Based Community-Driven Development (ABCD) approach is used as the method of this action research, namely community development carried out based on the assets owned, namely human, social, and supportive environmental assets. Community development process with independent participation (self-mobilization) through Appreciative Inquiry. The discovery of data is covered in the FGD process, interviews, observation and documentation, and the evaluation techniques used are before-after and historical plots. Program changes can be analyzed by looking at the development of a more structured group management and realizing the development of a business development plan. So that if the business starts operating, in the future it can have an impact on strengthening the economy, social and environment of the community.