Pub Date : 2019-02-21DOI: 10.11144/JAVERIANA.IYU23-1.PPLB
Margarita Gamarra, Inés Meriño Fuentes, Juan Calabria Sarmiento, Omar Gutierrez Acosta, Mauricio Barrios Barrios, Nallig Leal, Pedro Mario Wightman Rojas
Introduction: The use of mobile applications has increased in the last years. Most of them require the knowledge of the user location, either for their core service or for marketing purposes. Location-based services (LBS) offer context-based assistance to users based on their location. Although these applications ask the user for permission to use their location and even explain in detail how this information will be used in its terms and conditions, most users are not aware or even interested in the fact that their location information is stored in databases and monetized by selling it to third-party companies. Regarding this situation, we developed a study with the aim to assess perception, concerns and awareness from users about their location information. Methods: This work is based on an exploratory survey applied to the university community, mainly from the North Coast of Colombia, to measure the perception of location privacy of users with mobile devices. The questionnaire was applied using Google Forms. The survey has nineteen questions organized in three sections: personal information, identification of privacy and privacy management. These questions were designed to know the users’ perceptions of privacy concerns in LBS and any actions they take to preserve it. Results: The results show that, in general, the respondents do not have a real concern regarding the privacy of their geolocation data, and the majority is not willing to pay to protect their privacy. Conclusions: This type of surveys can generate awareness among participants about the use of their private information. The results expose in this paper can be used to create government policies and regulations by technology companies about the privacy management.
{"title":"Privacy perception in location-based services for mobile devices in the university community of the north coast of Colombia","authors":"Margarita Gamarra, Inés Meriño Fuentes, Juan Calabria Sarmiento, Omar Gutierrez Acosta, Mauricio Barrios Barrios, Nallig Leal, Pedro Mario Wightman Rojas","doi":"10.11144/JAVERIANA.IYU23-1.PPLB","DOIUrl":"https://doi.org/10.11144/JAVERIANA.IYU23-1.PPLB","url":null,"abstract":"Introduction: The use of mobile applications has increased in the last years. Most of them require the knowledge of the user location, either for their core service or for marketing purposes. Location-based services (LBS) offer context-based assistance to users based on their location. Although these applications ask the user for permission to use their location and even explain in detail how this information will be used in its terms and conditions, most users are not aware or even interested in the fact that their location information is stored in databases and monetized by selling it to third-party companies. Regarding this situation, we developed a study with the aim to assess perception, concerns and awareness from users about their location information. Methods: This work is based on an exploratory survey applied to the university community, mainly from the North Coast of Colombia, to measure the perception of location privacy of users with mobile devices. The questionnaire was applied using Google Forms. The survey has nineteen questions organized in three sections: personal information, identification of privacy and privacy management. These questions were designed to know the users’ perceptions of privacy concerns in LBS and any actions they take to preserve it. Results: The results show that, in general, the respondents do not have a real concern regarding the privacy of their geolocation data, and the majority is not willing to pay to protect their privacy. Conclusions: This type of surveys can generate awareness among participants about the use of their private information. The results expose in this paper can be used to create government policies and regulations by technology companies about the privacy management.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83452798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-02-19DOI: 10.11144/javeriana.iyu23-1.ggsp
Andrés Felipe Cruz-Rodríguez, Sebastián Ospina-Gómez, P. Feijóo-García
Introduction: Overpopulation in emergency services is a problem that can be observed worldwide, and although it has been addressed from different disciplines and perspectives, it still afflicts citizens who are subject to long waiting lists before being attended. Objective: The work here describes the design, development and the first validation of a Web and Mobile georeferenced crowd system for the city of Bogotá, Colombia, oriented to inform and empower the citizen on the population status of the emergency services found in the city. Materials and Method: In this document, we present the architecture, design, and features of the GALILEO System, with results regarding the first validation with citizens of Bogotá, to capture the acceptance and perceived impact of this type of solution in the context in which the System is proposed to function. Results and Discussion: Although GALILEO has not yet been massively implemented in the context for which it is proposed, the results presented here allow us to explore how Information and Communication Technologies (ICT) can be proposed to solve complex social problems, particularly considering the role of the citizen as a source and receiver of information.
{"title":"GALILEO: A Georeferenced System proposed for Emergency Services’ Population Control","authors":"Andrés Felipe Cruz-Rodríguez, Sebastián Ospina-Gómez, P. Feijóo-García","doi":"10.11144/javeriana.iyu23-1.ggsp","DOIUrl":"https://doi.org/10.11144/javeriana.iyu23-1.ggsp","url":null,"abstract":"Introduction: Overpopulation in emergency services is a problem that can be observed worldwide, and although it has been addressed from different disciplines and perspectives, it still afflicts citizens who are subject to long waiting lists before being attended. Objective: The work here describes the design, development and the first validation of a Web and Mobile georeferenced crowd system for the city of Bogotá, Colombia, oriented to inform and empower the citizen on the population status of the emergency services found in the city. Materials and Method: In this document, we present the architecture, design, and features of the GALILEO System, with results regarding the first validation with citizens of Bogotá, to capture the acceptance and perceived impact of this type of solution in the context in which the System is proposed to function. Results and Discussion: Although GALILEO has not yet been massively implemented in the context for which it is proposed, the results presented here allow us to explore how Information and Communication Technologies (ICT) can be proposed to solve complex social problems, particularly considering the role of the citizen as a source and receiver of information.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"389 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80802343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-02-19DOI: 10.11144/javeriana.iyu23-1.crsd
J. Mallek, H. Daoud, R. Aloulou, H. Mnif, M. Loulou
Objective: In this work the design of a fourth-order Reconfigurable Sigma Delta analog-to-digital converter (ΣΔ ADC) for 5MHz, 7MHz or 10MHz channel bandwidths are presented. Materials and methods: Our design technique aims to keep the same ADC architecture in response to multi-band and multi-mode aspects of Mobile WiMAX standard. To this end, we set each sampling frequency corresponding to each channel bandwidth, in order that the same OSR value would be kept for the different channel bandwidths. This technique is intended to optimize the power and area of the ADC that efficiently covers varying channel bandwidths. Moreover, we use the pole placement method to calculate the optimized filter coefficients of Continuous-Time Sigma-Delta (CT ΣΔ) ADC. Results and discussion: Over 5MHz, 7MHz and 10MHz channel bandwidths, the ADC achieved 72.89dB, 67.26dB and 66.47dB peak SNR values, respectively and a dynamic range of 73.5dB, 69.47dB and 66.5dB respectively with only 28mW, 28.2mW and 28.6mW power consumption respectively. Conclusions: The design of the proposed reconfigurable ADC intended for use in the mobile WiMAX standard were achieved. Moreover, the results obtained are satisfactory and are in accordance with theoretical expectations.
{"title":"A 0.58 mm2 CMOS reconfigurable sigma delta ADC for mobile WiMAX receiver","authors":"J. Mallek, H. Daoud, R. Aloulou, H. Mnif, M. Loulou","doi":"10.11144/javeriana.iyu23-1.crsd","DOIUrl":"https://doi.org/10.11144/javeriana.iyu23-1.crsd","url":null,"abstract":"Objective: In this work the design of a fourth-order Reconfigurable Sigma Delta analog-to-digital converter (ΣΔ ADC) for 5MHz, 7MHz or 10MHz channel bandwidths are presented. Materials and methods: Our design technique aims to keep the same ADC architecture in response to multi-band and multi-mode aspects of Mobile WiMAX standard. To this end, we set each sampling frequency corresponding to each channel bandwidth, in order that the same OSR value would be kept for the different channel bandwidths. This technique is intended to optimize the power and area of the ADC that efficiently covers varying channel bandwidths. Moreover, we use the pole placement method to calculate the optimized filter coefficients of Continuous-Time Sigma-Delta (CT ΣΔ) ADC. Results and discussion: Over 5MHz, 7MHz and 10MHz channel bandwidths, the ADC achieved 72.89dB, 67.26dB and 66.47dB peak SNR values, respectively and a dynamic range of 73.5dB, 69.47dB and 66.5dB respectively with only 28mW, 28.2mW and 28.6mW power consumption respectively. Conclusions: The design of the proposed reconfigurable ADC intended for use in the mobile WiMAX standard were achieved. Moreover, the results obtained are satisfactory and are in accordance with theoretical expectations.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82397933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-02-19DOI: 10.11144/JAVERIANA.IYU23-1.IUMD
S. Galarza-Molina, A. Torres
Objective: This paper aims to assess cases where it is necessary to include uncertainties in decision-making input data. Materials and Methods: Three case studies with different numbers of alternatives and different numbers and natures of criteria were evaluated. The CRIDE tool [39] was used to include uncertainties in the input data. Results and Discussion: The results obtained showed that for more difficult decision-making problems, the inclusion of variations in input data could change the final decision, while for less challenging problems, it is unnecessary to take uncertainties into account. Conclusions: These findings could be useful for decision-makers in obtaining more accurate results or in saving time and money related to input data acquisition.
{"title":"Including uncertainties in multi-criteria decision-making: a superfluous task or a requirement?","authors":"S. Galarza-Molina, A. Torres","doi":"10.11144/JAVERIANA.IYU23-1.IUMD","DOIUrl":"https://doi.org/10.11144/JAVERIANA.IYU23-1.IUMD","url":null,"abstract":"Objective: This paper aims to assess cases where it is necessary to include uncertainties in decision-making input data. Materials and Methods: Three case studies with different numbers of alternatives and different numbers and natures of criteria were evaluated. The CRIDE tool [39] was used to include uncertainties in the input data. Results and Discussion: The results obtained showed that for more difficult decision-making problems, the inclusion of variations in input data could change the final decision, while for less challenging problems, it is unnecessary to take uncertainties into account. Conclusions: These findings could be useful for decision-makers in obtaining more accurate results or in saving time and money related to input data acquisition.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"324 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75232510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-02-18DOI: 10.11144/JAVERIANA.IYU23-1.OSCR
Jenifer Ramos Ríos, D. F. Manotas Duque, Juan Carlos Osorio Gómez
Objective: This study aims to propose a methodology that identifies and prioritizes the operational risk factors in a supply chain (SC) to provide a tool according to the process-based SC approach that is useful for risk assessment throughout the SC. Materials and methods: Risk identification was conducted by a scenario analysis, which linked the risk factors with the standard key performance indicators (KPIs) of the processes and logistics activities proposed by the supply chain operational reference model (SCORM o SCOR). These influence relationships were quantified using a proposed scale, and then, the risk factors were prioritized by the definition of their influence levels. This approach was applied to a real SC. Results and discussion: Twenty risk factors were clearly and effectively identified, analyzed and prioritized, and priority was given to those with the highest influence level, which can be understood as the risk factors that have a larger capacity to negatively affect SC performance. Conclusions: The methodology allows the identification of the most influential risk factors in a SC, and as it is based on a standard model, it fosters a collaborative analysis among its echelons. The main contributions of this paper are the risk identification by means of the KPIs of the SCOR model and the measurement of their influence levels, which is a new and useful feature for risk prioritization.
{"title":"Operational supply chain risk identification and prioritization from SCOR model","authors":"Jenifer Ramos Ríos, D. F. Manotas Duque, Juan Carlos Osorio Gómez","doi":"10.11144/JAVERIANA.IYU23-1.OSCR","DOIUrl":"https://doi.org/10.11144/JAVERIANA.IYU23-1.OSCR","url":null,"abstract":"Objective: This study aims to propose a methodology that identifies and prioritizes the operational risk factors in a supply chain (SC) to provide a tool according to the process-based SC approach that is useful for risk assessment throughout the SC. Materials and methods: Risk identification was conducted by a scenario analysis, which linked the risk factors with the standard key performance indicators (KPIs) of the processes and logistics activities proposed by the supply chain operational reference model (SCORM o SCOR). These influence relationships were quantified using a proposed scale, and then, the risk factors were prioritized by the definition of their influence levels. This approach was applied to a real SC. Results and discussion: Twenty risk factors were clearly and effectively identified, analyzed and prioritized, and priority was given to those with the highest influence level, which can be understood as the risk factors that have a larger capacity to negatively affect SC performance. Conclusions: The methodology allows the identification of the most influential risk factors in a SC, and as it is based on a standard model, it fosters a collaborative analysis among its echelons. The main contributions of this paper are the risk identification by means of the KPIs of the SCOR model and the measurement of their influence levels, which is a new and useful feature for risk prioritization.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79269148","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-08-09DOI: 10.11144/javeriana.iyu22-2.nccp
Fredy Alejandro Orjuela Guerrero, John Jairo Olaya Florez, José Edgar Alfonso Orjuela
Objective: In this work, niobium carbide (NbC) coatings were deposited on substrates of the tool steels AISI H13 and AISI D2 using thermo-reactive deposition/diffusion (TRD) in order to analyze their behavior against corrosion in a saline environment. Materials and methods: The niobium carbides were obtained using salt baths composed of borax pentahydrate, aluminum and ferroniobium. This mixture was heated at 1050 °C for 4 hours. The chemical composition was determined by X-ray fluorescence (XRF). The coatings were morphologically characterized using scanning electron microscopy (SEM), the crystal structure was analyzed using X-ray diffraction (XRD), and the electrochemical behavior was studied using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). Results and discussion: The XRF analysis indicated that the coatings contained 87.476 wt% Nb and 51.943 wt% Nb for the D2-substrate and the H13-substrate, respectively. The SEM images revealed that the morphology of the surface of the coatings was homogeneous. The XRD analysis established that the coatings were polycrystalline, and the electrochemical tests established that the corrosion resistance increased slightly in the covered substrates with respect to the uncoated steels, with the best results being obtained in the layers of niobium carbide deposited on AISI D2 steel. Conclusions: The analysis of corrosion resistance revealed that the coatings prepared on D2 steel have a higher corrosion resistance because they have fewer surface imperfections, which causes the coating to exhibit a dielectric behavior.
{"title":"Niobium carbide coatings produced on tool steels via thermo-reactive diffusion","authors":"Fredy Alejandro Orjuela Guerrero, John Jairo Olaya Florez, José Edgar Alfonso Orjuela","doi":"10.11144/javeriana.iyu22-2.nccp","DOIUrl":"https://doi.org/10.11144/javeriana.iyu22-2.nccp","url":null,"abstract":"Objective: In this work, niobium carbide (NbC) coatings were deposited on substrates of the tool steels AISI H13 and AISI D2 using thermo-reactive deposition/diffusion (TRD) in order to analyze their behavior against corrosion in a saline environment. Materials and methods: The niobium carbides were obtained using salt baths composed of borax pentahydrate, aluminum and ferroniobium. This mixture was heated at 1050 °C for 4 hours. The chemical composition was determined by X-ray fluorescence (XRF). The coatings were morphologically characterized using scanning electron microscopy (SEM), the crystal structure was analyzed using X-ray diffraction (XRD), and the electrochemical behavior was studied using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). Results and discussion: The XRF analysis indicated that the coatings contained 87.476 wt% Nb and 51.943 wt% Nb for the D2-substrate and the H13-substrate, respectively. The SEM images revealed that the morphology of the surface of the coatings was homogeneous. The XRD analysis established that the coatings were polycrystalline, and the electrochemical tests established that the corrosion resistance increased slightly in the covered substrates with respect to the uncoated steels, with the best results being obtained in the layers of niobium carbide deposited on AISI D2 steel. Conclusions: The analysis of corrosion resistance revealed that the coatings prepared on D2 steel have a higher corrosion resistance because they have fewer surface imperfections, which causes the coating to exhibit a dielectric behavior.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81441842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-08-09DOI: 10.11144/javeriana.iyu22-2.pacg
Ingrid Navarro Ochoa, Manuel Alfredo Figueredo Medina
Introduction: The cricondentherm is the highest temperature above which a liquid cannot be formed, regardless of the pressure. According to the Colombian natural gas transmission regulations, this temperature should not exceed 7.2°C. Although this restriction is currently applied over the whole country, it is possible to propose a different limit on the cricondentherm for the Colombian Caribbean coast. Methods: In this document, the current hydrocarbon dew point (HCDP) limits for gas transport pipelines in several countries worldwide are analyzed, the weather conditions on the Colombian Caribbean coast are reviewed, and a thermodynamic and hydraulic study is developed, taking into account the composition of the gas (before any treatment) from three fields on the Caribbean coast, the elevation profile of one of the gas pipelines on the Caribbean coast, and the influence of the weather conditions on the behavior of gas in the pipeline. Results: Some countries define their HCDP values depending on the region through which the gas is transported. Simulations of the chosen gas pipeline with lean gases without any treatment at the worst ambient conditions of the Colombian Caribbean coast show that there is a slight liquid condensation at 21°C, indicating a gap with the current regulations (7.2°C) in which an additional maximum cricondentherm can be proposed for the Colombian Caribbean coast. Conclusions: From this work, it is concluded that a new cricondentherm for warm climates in Colombia, within the transmission regulations, should be between 10 and 12.6°C. This proposal is based on the results obtained in simulations and the acknowledgment that some of the Colombian gas pipelines operate only in warm regions of the country.
{"title":"Technical evaluation for the proposal of a different cricondentherm limit for the Caribbean coast within Colombian gas quality regulations","authors":"Ingrid Navarro Ochoa, Manuel Alfredo Figueredo Medina","doi":"10.11144/javeriana.iyu22-2.pacg","DOIUrl":"https://doi.org/10.11144/javeriana.iyu22-2.pacg","url":null,"abstract":"Introduction: The cricondentherm is the highest temperature above which a liquid cannot be formed, regardless of the pressure. According to the Colombian natural gas transmission regulations, this temperature should not exceed 7.2°C. Although this restriction is currently applied over the whole country, it is possible to propose a different limit on the cricondentherm for the Colombian Caribbean coast. Methods: In this document, the current hydrocarbon dew point (HCDP) limits for gas transport pipelines in several countries worldwide are analyzed, the weather conditions on the Colombian Caribbean coast are reviewed, and a thermodynamic and hydraulic study is developed, taking into account the composition of the gas (before any treatment) from three fields on the Caribbean coast, the elevation profile of one of the gas pipelines on the Caribbean coast, and the influence of the weather conditions on the behavior of gas in the pipeline. Results: Some countries define their HCDP values depending on the region through which the gas is transported. Simulations of the chosen gas pipeline with lean gases without any treatment at the worst ambient conditions of the Colombian Caribbean coast show that there is a slight liquid condensation at 21°C, indicating a gap with the current regulations (7.2°C) in which an additional maximum cricondentherm can be proposed for the Colombian Caribbean coast. Conclusions: From this work, it is concluded that a new cricondentherm for warm climates in Colombia, within the transmission regulations, should be between 10 and 12.6°C. This proposal is based on the results obtained in simulations and the acknowledgment that some of the Colombian gas pipelines operate only in warm regions of the country.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"9 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76683611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-08-09DOI: 10.11144/javeriana.iyu22-2.femr
E. Serna M., Alexei Serna A.
Objective: Propose a framework to elicit multidimensional requirements. Materials and methods: A review of the literature is carried out, and the elicitation proposals are analyzed in which the multidimensionality of the requirements is taken into account. Results and discussion: 23 works were found, of which 15 were selected that met the quality conditions and inclusion criteria. These proposals are related to multidimensionality in elicitation but do not take it into account in order to construct a representative requirement specification. Conclusion: It is evident that there is no unanimity about the dimensions from which the requirements originate, and they have not been elicited. For this reason, and because its existence is accepted, it is necessary to unify criteria and propose frameworks to elicit multidimensional requirements.
{"title":"Framework to elicit multidimensional requirements","authors":"E. Serna M., Alexei Serna A.","doi":"10.11144/javeriana.iyu22-2.femr","DOIUrl":"https://doi.org/10.11144/javeriana.iyu22-2.femr","url":null,"abstract":"Objective: Propose a framework to elicit multidimensional requirements. Materials and methods: A review of the literature is carried out, and the elicitation proposals are analyzed in which the multidimensionality of the requirements is taken into account. Results and discussion: 23 works were found, of which 15 were selected that met the quality conditions and inclusion criteria. These proposals are related to multidimensionality in elicitation but do not take it into account in order to construct a representative requirement specification. Conclusion: It is evident that there is no unanimity about the dimensions from which the requirements originate, and they have not been elicited. For this reason, and because its existence is accepted, it is necessary to unify criteria and propose frameworks to elicit multidimensional requirements.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81453913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-08-09DOI: 10.11144/JAVERIANA.IYU22-2.STTB
N. Qosim, S. Supriadi, A. S. Saragih, Y. Whulanza
Objective: This research aims to observe the extent to which several surface treatment techniques increase the surface roughness of titanium alloy implants which was manufactured via electrical discharge machining (EDM). The effects of these techniques were also observed to decrease the Cu content on the implant surface. Materials and Methods: In this research, ultrasonic cleaning, rotary tumbler polishing, and brushing were employed as techniques to increase the roughness of a titanium implant which was manufactured via EDM, to the moderately rough category, and to reduce the contaminant element deposited on its surface. An MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay test was also used to observe the effect of these engineered specimens with respect to mesenchymal stem cells’ proliferation. Results and Discussion: The results show that ultrasonic cleaning and rotary tumbler polishing created a significant increase (90% and 67%, respectively) in the surface roughness. On the other hand, brushing was shown to be the best benchmark for reducing the contamination of Copper (Cu). Furthermore, rotary tumbler polishing and brushing can increase the percentage of living cells compared to the original surface EDM specimens. Conclusion: All micro-finishing methods that were employed are able to increase the surface roughness of Ti alloy based-implant to moderately rough category.
{"title":"Surface treatments of ti-alloy based bone implant manufactured by electrical discharge machining","authors":"N. Qosim, S. Supriadi, A. S. Saragih, Y. Whulanza","doi":"10.11144/JAVERIANA.IYU22-2.STTB","DOIUrl":"https://doi.org/10.11144/JAVERIANA.IYU22-2.STTB","url":null,"abstract":"Objective: This research aims to observe the extent to which several surface treatment techniques increase the surface roughness of titanium alloy implants which was manufactured via electrical discharge machining (EDM). The effects of these techniques were also observed to decrease the Cu content on the implant surface. Materials and Methods: In this research, ultrasonic cleaning, rotary tumbler polishing, and brushing were employed as techniques to increase the roughness of a titanium implant which was manufactured via EDM, to the moderately rough category, and to reduce the contaminant element deposited on its surface. An MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay test was also used to observe the effect of these engineered specimens with respect to mesenchymal stem cells’ proliferation. Results and Discussion: The results show that ultrasonic cleaning and rotary tumbler polishing created a significant increase (90% and 67%, respectively) in the surface roughness. On the other hand, brushing was shown to be the best benchmark for reducing the contamination of Copper (Cu). Furthermore, rotary tumbler polishing and brushing can increase the percentage of living cells compared to the original surface EDM specimens. Conclusion: All micro-finishing methods that were employed are able to increase the surface roughness of Ti alloy based-implant to moderately rough category.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79163536","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-08-09DOI: 10.11144/JAVERIANA.IYU22-2.MSCD
J. A. Alvarado Valencia, Daniel Silva
Introduction: We developed a model for a make-to-order supply chain to evaluate the effects of worker unpunctuality, tolerance to delay and word-of-mouth according to customer waiting time (dis)satisfaction in four customer lifetime value measures (CLTV): switching customers, the number of sales per customer, the average customer loyalty and the potential market reached. Methods: We developed a hybrid (agent-based and discrete-event) simulation in a 33 * 4 experimental design. Results: All of the variables were significant in the four CLTV measures, except for tolerance to delay. The positive word-of-mouth effect was greater than the negative word-of-mouth effect. There were significant interactions between positive and negative word-of-mouth. Conclusions: This type of model becomes a decision support tool for businesses to evaluate their mid-to-long term performance taking into account their customers’ long-term behaviors and the relationships between potential customers in repetitive and competitive environments.
{"title":"Modeling and simulation of customer dissatisfaction, worker unpunctuality and tolerance to delay in make-to-order supply chains measured through customer lifetime value performance","authors":"J. A. Alvarado Valencia, Daniel Silva","doi":"10.11144/JAVERIANA.IYU22-2.MSCD","DOIUrl":"https://doi.org/10.11144/JAVERIANA.IYU22-2.MSCD","url":null,"abstract":"Introduction: We developed a model for a make-to-order supply chain to evaluate the effects of worker unpunctuality, tolerance to delay and word-of-mouth according to customer waiting time (dis)satisfaction in four customer lifetime value measures (CLTV): switching customers, the number of sales per customer, the average customer loyalty and the potential market reached. Methods: We developed a hybrid (agent-based and discrete-event) simulation in a 33 * 4 experimental design. Results: All of the variables were significant in the four CLTV measures, except for tolerance to delay. The positive word-of-mouth effect was greater than the negative word-of-mouth effect. There were significant interactions between positive and negative word-of-mouth. Conclusions: This type of model becomes a decision support tool for businesses to evaluate their mid-to-long term performance taking into account their customers’ long-term behaviors and the relationships between potential customers in repetitive and competitive environments.","PeriodicalId":39036,"journal":{"name":"Ingenieria y Universidad","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90291952","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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