Well Completion Challenges in an Extreme Environment: A Case Study of the Design, Material and Completion Equipment Selection Process for Extreme Environments

A Dispatching-Fuzzy AHP-TOPSIS Model for Scheduling Flexible Job-Shop Systems in Industry 4.0 Context

Applied Sciences ◽

10.3390/app11115107 ◽

2021 ◽

Vol 11 (11) ◽

pp. 5107

Author(s):

Miguel Ortíz-Barrios ◽

Antonella Petrillo ◽

Fabio De Felice ◽

Natalia Jaramillo-Rueda ◽

Genett Jiménez-Delgado ◽

...

Keyword(s):

Job Shop ◽

Selection Process ◽

Fuzzy Ahp ◽

Flexible Job Shop ◽

Criteria Weights ◽

Dispatching Algorithm ◽

Scheduling Method ◽

Hard Problems ◽

Fourth Step

Scheduling flexible job-shop systems (FJSS) has become a major challenge for different smart factories due to the high complexity involved in NP-hard problems and the constant need to satisfy customers in real time. A key aspect to be addressed in this particular aim is the adoption of a multi-criteria approach incorporating the current dynamics of smart FJSS. Thus, this paper proposes an integrated and enhanced method of a dispatching algorithm based on fuzzy AHP (FAHP) and TOPSIS. Initially, the two first steps of the dispatching algorithm (identification of eligible operations and machine selection) were implemented. The FAHP and TOPSIS methods were then integrated to underpin the multi-criteria operation selection process. In particular, FAHP was used to calculate the criteria weights under uncertainty, and TOPSIS was later applied to rank the eligible operations. As the fourth step of dispatching the algorithm, the operation with the highest priority was scheduled together with its initial and final time. A case study from the smart apparel industry was employed to validate the effectiveness of the proposed approach. The results evidenced that our approach outperformed the current company’s scheduling method by a median lateness of 3.86 days while prioritizing high-throughput products for earlier delivery.

Download Full-text

FEATURE FILTERING AND SELECTION FOR DRY MATTER ESTIMATION ON PERENNIAL RYEGRASS: A CASE STUDY OF VEGETATION INDICES

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-2-w13-1827-2019 ◽

2019 ◽

Vol XLII-2/W13 ◽

pp. 1827-1831 ◽

Cited By ~ 3

Author(s):

G. T. Alckmin ◽

L. Kooistra ◽

A. Lucieer ◽

R. Rawnsley

Keyword(s):

Feature Selection ◽

Perennial Ryegrass ◽

Dry Matter ◽

Selection Process ◽

Vegetation Indices ◽

Robust Model ◽

Trade Offs ◽

Initial Dataset ◽

High Degree

Abstract. Vegetation indices (VIs) have been extensively employed as a feature for dry matter (DM) estimation. During the past five decades more than a hundred vegetation indices have been proposed. Inevitably, the selection of the optimal index or subset of indices is not trivial nor obvious. This study, performed on a year-round observation of perennial ryegrass (n&thinsp;=&thinsp;900), indicates that for this response variable (i.e. kg.DM.ha&minus;1), more than 80% of indices present a high degree of collinearity (correlation&thinsp;&gt;&thinsp;|0.8|.) Additionally, the absence of an established workflow for feature selection and modelling is a handicap when trying to establish meaningful relations between spectral data and biophysical/biochemical features. Within this case study, an unsupervised and supervised filtering process is proposed to an initial dataset of 97 VIs. This research analyses the effects of the proposed filtering and feature selection process to the overall stability of final models. Consequently, this analysis provides a straightforward framework to filter and select VIs. This approach was able to provide a reduced feature set for a robust model and to quantify trade-offs between optimal models (i.e. lowest root mean square error &ndash; RMSE&thinsp;=&thinsp;412.27&thinsp;kg.DM.ha&minus;1) and tolerable models (with a smaller number of features &ndash; 4 VIs and within 10% of the lowest RMSE.)

Download Full-text

Stability-based motion planning for a modular morphing wing

10.32920/ryerson.14655543 ◽

2021 ◽

Author(s):

Michael C. F. Kwong

Keyword(s):

Selection Process ◽

Static Stability ◽

Path Selection ◽

Critical Parameters ◽

Morphing Wing ◽

Wing Geometry ◽

Variable Geometry Truss ◽

Different Levels ◽

Longitudinal Static Stability

Aircraft wing geometry morphing is a technology that has seen recent interest due to demand for aircraft to improve aerodynamic performance for fuel saving. One proposed idea to alter wing geometry is by a modular morphing wing designed through a discretization method and constructed using variable geometry truss mechanisms (VGTM). For each morphing maneuver, there are sixteen possible actuation paths for each VGTM module, and thus offering a three module morphing wing to have a total of 16(to the power of 3) permutations of actuation paths for one morphing maneuver. Focused on longitudinal static stability, critical parameters and aircraft stability theory, this thesis proposes a method to find an optimal actuation path for a designated maneuver iteratively. A case study of a three module morphing wing demonstrated the actuation path selection process. Numerically, different actuation paths had different levels of longitudinal static stability; these paths were drawn in CATIA and were visually verified.

Download Full-text

EVALUATION OF ANTIMICROBIAL AND ANTIPROLIFERATIVE ACTIVITIES OF ACTINOBACTERIA ISOLATED FROM THE SALINE LAGOONS OF NORTHWEST PERU

10.1101/2020.10.07.329441 ◽

2020 ◽

Author(s):

Rene Flores Clavo ◽

Nataly Ruiz Quiñones ◽

Álvaro Tasca Hernandez ◽

Ana Lucia Tasca Gois Ruiz ◽

Lucia Elaine de Oliveira Braga ◽

...

Keyword(s):

Antibacterial Activity ◽

Antiproliferative Activity ◽

Extreme Environments ◽

Extreme Environment ◽

Small Cells ◽

E Coli ◽

The North ◽

Salt Flats ◽

Multiple Drugs ◽

Antiproliferative Activities

AbstractThe unexplored saline lagoons of the north of Peru harbor a rich microbiome, due to reported studies of different extreme environments around the world. In these regions, there are several ecosystems and microhabitats not yet explored, and little is known about the diversity of actinobacteria and other microorganisms. We suggest that the endemic bacteria present in this extreme environment could be source of active molecules with anticancer, antimicrobial, antiparasitic properties. Using phenotypic and genotypic characterization techniques including the 16S rRNA were identified into the genera Streptomyces 39 (78%), Pseudonocardia 3 (6%), Staphylococcus 4 (8%), Bacillus 2 (4%), and Pseudomonas 2 (4%). All isolated bacteria for the genotypic data were preliminarily identified. Actinobacteria strains were found dominantly in both sites (Lagoon1-3 = 16 isolates and lagoon 4 = 12 isolates). Phylogenetic analysis revealed that 28 isolates were exclusively affiliated to eleven different clusters of Actinobacteria of the major genus Streptomyces. Three Streptomyces sp. strains M-92, B-146, and B-81, were tested for antibacterial and antiproliferative activities. The results showed antiproliferative activities against three tumor cell lines, U251 glioma; MCF7 breast; NCI-H460 lung non-small type of cells, and the antibacterial activity to Staphylococcus aureus ATCC 6538, E. coli ATCC 10536, and Acinetobacter baumanni AC-972 which is resistant to multiple drugs. The promising results belong to Streptomyces sp. B-81 strain in the R2A medium using a doxorubicin with control positive, the best result was from the latter (TGI = 0,57 µg/mL) for glioma; NCI-H460 lung of type non-small cells (TGI = 0,61 µg/mL), and breast cancer (TGI =0,80 µg/mL), this strain was selected to be fractionated because it had better antiproliferative and antibacterial activity, and its fractions were evaluated concerning antiproliferative activity against nine types of tumor cells and one non-tumor. The methanolic fraction showed a better result in the antiproliferative activity and was able to inhibit U251 (glioma) (TGI = 38.3 µg/mL), OVCAR-03 (ovary) (TGI = 62.1 µg/mL), and K562 (leukemia) (TGI = 81.5 µg/mL). The methanol 50% - acetate 50% fraction (Fraction 4) inhibited U251 (glioma) (TGI = 73.5 µg/mL) and UACC-62 (melanoma) (TGI = 89.4 µg/mL). Moreover, the UHPLC-MS/MS data and molecular networking of Streptomyces sp. B-81 isolate extract revealed the production cholic acid, Lobophorin A, Lobophorin B, Lobophorin E, Lobophorin K and compound 6. Extremophilic environments such as the Mórrope and Bayovar Salt Flats are promising sources of new bacteria with promising pharmaceutical potential; These compounds could be useful to treat various infectious diseases or even some type of cancer.

Download Full-text

Processo seletivo de tutores da UAB da UFAL: aspectos para uma seleção criteriosa e significativa

Revista EDaPECI ◽

10.29276/redapeci.2014.14.33116.545-560 ◽

2015 ◽

Vol 14 (3) ◽

pp. 545-560

Author(s):

Rosana Sarita de Araujo

Keyword(s):

Selection Process ◽

Legal Aspects ◽

Legal Basis ◽

Case Study Methodology ◽

Proof Of Knowledge ◽

Palabras Clave ◽

Study Methodology ◽

Investigación Cualitativa ◽

Selection Of

Resumo: O trabalho discute o processo seletivo de tutores da UAB da UFAL, considerando os aspectos legais, bem como os aspectos técnico-pedagógicos que traduzem a seleção como criteriosa e significativa. Caracterizada como pesquisa qualitativa utiliza a metodologia de estudo de caso e de comparação para estudo de dois editais da UFAL de processos seletivos de tutores. A análise dos dados aponta as limitações que a legislação delineia para a seleção de tutores, as diferenças nos índices de aprovação dos candidatos em relação às etapas utilizadas no processo de seleção, os impactos da prova de conhecimento versus entrevista, bem como demonstra a crescente credibilidade do processo de seleção de tutores da UFAL. Palavras-chave: Seleção de tutores. Base legal. Aspectos pedagógicos Abstract: The work discusses the selection process of the UAB tutors from UFAL, considering the legal aspects, as well as pedagogical and technical aspects that reflect the selection as judicious and significant. Characterized as qualitative research it uses the case study methodology and comparison for the study of two UFAL public notices for the selective processes of tutors. Data analysis points out the limitations that legislation delineates for the selection of tutors, differences in approval rates of candidates regarding the steps used in the selection process, the impacts of proof of knowledge versus interview, and it also demonstrates the growing credibility of the UFAL tutors selection process. Keywords: Selection of tutors. Legal basis. Pedagogical aspects Resumen: En este trabajo se discute el proceso de selección de los tutores de la UAB UFAL, considerando los aspectos legales , así como los aspectos técnicos y pedagógicos que traducen la selección minunciosa y significativa. Caracterizado como investigación cualitativa utiliza la metodología de estudio de caso y comparación con el estudio de dos convocatorias de la UFAL de procesos de selección de tutores. La análisis de los datos muestran las limitaciones que la legislación esboza para seleccionar los tutores, las diferencias en los índices de aprobación de los candidato en relación a las fases utilizadas en el proceso de selección , el impacto de la prueba de conocimientos frente a la entrevista , y demuestra la credibilidad creciente del proceso de selección de tutores de la UFAL . Palabras clave: Selección de tutores. Base legal. Aspectos pedagógicos

Download Full-text

Integration of sustainability aspects in the supplier selection process: a case study from a German electronics firm

International Journal of Applied Research in Management and Economics ◽

10.33422/ijarme.v3i2.170 ◽

2020 ◽

Vol 3 (2) ◽

pp. 13-27

Author(s):

Rubén Medina Serrano ◽

Wanja Wellbrock ◽

María Reyes González Ramirez ◽

José Luis Gascó

Keyword(s):

Supply Chain ◽

Supply Chain Management ◽

Supplier Selection ◽

Selection Process ◽

Research Work ◽

Academic Research ◽

Professional Activity ◽

Chain Management ◽

Sustainable Supplier Selection

The supplier selection process has become an important area of research and professional activity, and it is fundamental to understand the types and trends of research in this field. The appropriate supplier selection decision is a fundamental strategic process and plays an important role in supply chain management. In the last decade, academic research on sustainability has evolved rapidly in the supply chain literature. However, there has been scant opportunity for the research community to complete a global assessment of sustainable supplier selection activities to date. This paper seeks to address this need by exploring sustainability in supply chain management, developing a sustainable supplier selection framework with a tool for its operationalization to help managers evaluate supplier selection decisions. Our proposed model is based on the TOPSIS concept as a multiple criteria decision-making (MCDM) model and is validated through a case study. This research work follows the best-in-class approach to comply with all applicable environmental regulations and laws in the supplier selection process.

Download Full-text

DEVELOPMENT STRATEGY OF HUMAN CAPITAL OF PT KIMIA FARMA (PERSERO) TBK

IJHCM (International Journal of Human Capital Management) ◽

10.21009/ijhcm.012.17 ◽

2017 ◽

Vol 1 (02) ◽

pp. 153-162

Author(s):

Antoni Ludfi Arifin

Keyword(s):

Human Capital ◽

Development Strategy ◽

Selection Process ◽

Theory Building ◽

Primary Data ◽

Secondary Sources ◽

Recruitment And Selection ◽

The Right ◽

Capital Development

This research is a qualitative research with case study at PT Kimia Farma (Persero) Tbk. The purpose of this research is to understand the overall development strategy of human capital of the Company. Data were collected from primary data through interview, observation, and recording; while secodary data were obtained from PT Kimia Farma (Persero) Tbk or from the externals that are used by the researcher to strengthen the premise, theory building, or data from previous researchers. The data collected from primary and secondary sources are then processed. The validity of data is checked though data accuracy checking process (triangulation). This research found that the Company has conducted human reseource development strategy through 1) Integrated HR Development with the Companyâ€™s visions and missions; 2) open recruitment and selection process will decide and find the candidates who meet the qualifications; 3) preparing assessement center to select the right candidate for the right position; 4) employees training can improve the employeesâ€™ competence; and 5) the right development of human capital to prepare for the competitiveness in the future.. Keywords: Human Capital, Development, Strategy, HR Planning

Download Full-text

Europe's Path To Mars: The European Space Agency's Mars Express Mission

Historical Studies in the Natural Sciences ◽

10.1525/hsns.2011.41.2.123 ◽

2011 ◽

Vol 41 (2) ◽

pp. 123-178 ◽

Cited By ~ 1

Author(s):

Arturo Russo

Keyword(s):

Selection Process ◽

European Space Agency ◽

Management Approach ◽

Mars Exploration ◽

Mars Express ◽

The Public ◽

Science Programme ◽

Space Agency ◽

History Of

Mars Express is the first planetary mission accomplished by the European Space Agency (ESA). Launched in early June 2003, the spacecraft entered Mars's orbit on Christmas day of that year, demonstrating the new European commitment to planetary exploration. Following a failed attempt in the mid-1980s, two valid proposals for a European mission to Mars were submitted to ESA's decision-making bodies in the early 1990s, in step with renewed international interest in Mars exploration. Both were rejected, however, in the competitive selection process for the agency's Science Programme. Eventually, the Mars Express proposal emerged during a severe budgetary crisis in the mid-1990s as an exemplar of a “flexible mission” that could reduce project costs and development time. Its successful maneuvering through financial difficulties and conflicting scientific interests was due to the new management approach as well as to the public appeal of Mars exploration. In addition to providing a case study in the functioning of the ESA's Science Programme, the story of Mars Express discussed in this paper provides a case study in the functioning of the European Space Agency's Science Programme and suggests some general considerations on the peculiar position of space research in the general field of the history of science and technology.

Download Full-text