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Articles 1231 - 1260 of 3541
Full-Text Articles in Entire DC Network
Impact Evaluation Of Major Hurricanes On Designated Southeast Coast Counties Of Usa Using Multivariate Analysis And Forecasting, Mukti Patel
All ETDs from UAB
The study includes four major analyses. Each analysis has its own uniqueness. The Temporal analysis intended to track the economic effect trends of major storms in small counties and large metro regions as well as compare how the percent GDP loss in these locations has affected. The study shows that unfavorable impacts of major storms of the same scale and intensity stood the greatest shift in GDP growth rate percentage along with greatest damage in terms of GDP particularly in the smaller counties during and after major storm event. In addition to that percentage change in population growth rate, personal …
Classification And Evaluation Of Extended Pics (Epics) On A Global Scale For Calibration And Stability Monitoring Of Optical Satellite Sensors, Juliana Maria Fajardo Rueda
Classification And Evaluation Of Extended Pics (Epics) On A Global Scale For Calibration And Stability Monitoring Of Optical Satellite Sensors, Juliana Maria Fajardo Rueda
Electronic Theses and Dissertations
As targets for the calibration and monitoring of optical satellite sensors, historically stable areas across North Africa have been used, known as Pseudo Invariant Calibration Sites PICS. However, two major drawbacks exist for these sites; first is the dependency on a single location to be always invariant, and second is the limited amount of observation achieved using these sites. As a result, longer time periods are needed to construct a dense data set to assess the radiometric performance of on-orbit optical sensors, and be convinced that the change detected is sensor-specific rather than site-specific. This work presents a global land …
Quantifying The Impacts Of Land Use, Management And Climate Change On Water Resources In Missouri River Basin, Arun Bawa
Electronic Theses and Dissertations
A location-specific evaluation of hydrological landscape responses concerning past and projected climate and land use land cover (LULC) changes can provide a powerful intellectual basis for developing efficient and profitable agroecosystems, and overcoming uncertain and detrimental consequences of LULC and climate shifts. This dissertation assessed the impacts of land use, management, and climate change on water resources in the Missouri River Basin (MRB) through four specific studies that included: (i) to study the responses of leached nutrient concentrations and soil health to winter rye cover crop (CC) under no-till corn (Zea mays L.)-soybean [Glycine max (L.) Merr.] rotation, (ii) to …
Mind The Gap: Exploring The Challenges And Opportunities For Social Enterprise In Vietnam, Paul Umfreville, Christine Bonnin
Mind The Gap: Exploring The Challenges And Opportunities For Social Enterprise In Vietnam, Paul Umfreville, Christine Bonnin
Articles
Social enterprise is a maturing area of activity within the development sector, and in Vietnam the sector has expanded significantly over the last thirty years, providing social services to communities and individuals experiencing socio-economic exclusion. Initially growing in a legislative vacuum, social enterprise currently appears to be flourishing following recognition by the state. However, the sector now faces new challenges as it matures. With Vietnam’s attainment of middle-income status, the international development funding previously available is now limited and the focus is on capacity and viability. Based on findings from interviews with representatives from a wide range of social enterprises …
Optimal Multi-Reservoir System Operations Under Inflow Scenarios In Nam Ngum River Basin, Lao Pdr, Bounhome Kimmany
Optimal Multi-Reservoir System Operations Under Inflow Scenarios In Nam Ngum River Basin, Lao Pdr, Bounhome Kimmany
Chulalongkorn University Theses and Dissertations (Chula ETD)
The Nam Ngum River is one of the main rivers in Lao PDR. Many hydropower projects are currently operated, under construction, and in the planning stage within the Nam Ngum River Basin (NNRB). These hydropower projects are managed by different organizations which could lead to conflict in operation and hinder the achievement of national developments. The main objective of this research is therefore to develop an optimization model for maximizing hydropower production in the NNRB through optimal reservoir operation under the impact of climate change. The potential consequence of maximizing hydropower production that could lead to flooding was also considered …
Supporting Shrinkage: Planning And Decision Making For Legacy Cities, Michael P. Johnson Jr., Justin Hollander, Eliza Whiteman Kinsey, George Chichirau, Charla Burnett
Supporting Shrinkage: Planning And Decision Making For Legacy Cities, Michael P. Johnson Jr., Justin Hollander, Eliza Whiteman Kinsey, George Chichirau, Charla Burnett
Public Policy and Public Affairs Faculty Publication Series
Supporting Shrinkage describes a new approach to citizen-engaged, community-focused planning methods and technologies for cities and regions facing decline, disinvestment, shrinkage, and social and physical distress. The volume evaluates the benefits and costs of a wide range of analytic approaches for designing policy and planning interventions for shrinking cities and distressed communities. These include collaborative planning, social media, civic technology, game design, analytics, decision modeling and decision support, and spatial analysis. The authors present case studies of three US cities addressing shrinkage and decline, with a focus on issues of social justice, democratization of knowledge, and local empowerment. Proposed as …
A Microscopic Simulation Approach For Developing Ramp Metering Activation Guidelines For Weekends, Sarah T. Kasomi
A Microscopic Simulation Approach For Developing Ramp Metering Activation Guidelines For Weekends, Sarah T. Kasomi
UNF Graduate Theses and Dissertations
Traffic congestion is one of the major concerns in urban motorways. Agencies are implementing various Transportation Systems Management and Operations (TSM&O) strategies to reduce traffic congestion on roadway networks. Ramp metering is a TSM&O strategy that utilizes signals installed at freeways’ on-ramps to dynamically manage traffic entering the freeway. RMSs have been effective at alleviating recurring congestion. Recurring congestion, however, constitutes less than half of all congestion. More than half of all congestion is due to non-recurring events such as incidents, work zones, adverse weather conditions, special events, etc., that adversely affect the performance of a highway. Non-recurring congestion on …
Determining And Evaluating New Store Locations Using Remote Sensing Andmachine Learning, Berkan Höke, Zeynep Zerri̇n Turgay, Cem Ünsalan, Hande Küçükaydin
Determining And Evaluating New Store Locations Using Remote Sensing Andmachine Learning, Berkan Höke, Zeynep Zerri̇n Turgay, Cem Ünsalan, Hande Küçükaydin
Turkish Journal of Electrical Engineering and Computer Sciences
Decision making for store locations is crucial for retail companies as the profit depends on the location. The key point for correct store location is profit approximation, which is highly dependent on population of the corresponding region, and hence, the volume of the residential area. Thus, estimating building volumes provides insight about the revenue if a new store is about to be opened there. Remote sensing through stereo/tri-stereo satellite images provides wide area coverage as well as adequate resolution for three dimensional reconstruction for volume estimation. We reconstruct 3D map of corresponding region with the help of semiglobal matching and …
Inter-Microgrid Operation: Power Sharing, Frequency Restoration, Seamless Reconnection And Stability Analysis, Sandipan Patra
Inter-Microgrid Operation: Power Sharing, Frequency Restoration, Seamless Reconnection And Stability Analysis, Sandipan Patra
Doctoral
Electrification in the rural areas sometimes become very challenging due to area accessibility and economic concern. Standalone Microgrids (MGs) play a very crucial role in these kinds of a rural area where a large power grid is not available. The intermittent nature of distributed energy sources and the load uncertainties can create a power mismatch and can lead to frequency and voltage drop in rural isolated community MG. In order to avoid this, various intelligent load shedding techniques, installation of micro storage systems and coupling of neighbouring MGs can be adopted. Among these, the coupling of neighbouring MGs is the …
A Two-Level Information Modelling Translation Methodology And Framework To Achieve Semantic Interoperability In Constrained Geoobservational Sensor Systems, Paul Stacey
Doctoral
As geographical observational data capture, storage and sharing technologies such as in situ remote monitoring systems and spatial data infrastructures evolve, the vision of a Digital Earth, first articulated by Al Gore in 1998 is getting ever closer. However, there are still many challenges and open research questions. For example, data quality, provenance and heterogeneity remain an issue due to the complexity of geo-spatial data and information representation.
Observational data are often inadequately semantically enriched by geo-observational information systems or spatial data infrastructures and so they often do not fully capture the true meaning of the associated datasets. Furthermore, data …
A Hydrologic Study Of Climate Variability In Arid Region, Abdullah Alzaydani
A Hydrologic Study Of Climate Variability In Arid Region, Abdullah Alzaydani
Electronic Theses and Dissertations
Climate variability is an important subject to study. It is the change of climate over a long time, which could have a positive or negative impact on humans, soil, and wildlife. Many environments, such as arid environment could be affected by climate variability. The research goal is studying and examining climate variability in arid environment. The research includes three different studies. The first study includes reviewing and understanding of climate variability over extended time through existing studies in arid environments. In addition, this study includes knowledge about climate negative or positive impact on the environment. This study will be reviewing …
The Course Scheduling Problem With Room Considerations, Lijian Xiao
The Course Scheduling Problem With Room Considerations, Lijian Xiao
Browse all Theses and Dissertations
The course scheduling problem (CSP), more commonly referred to as the university timetabling problem, belongs to the larger family of general scheduling problems, where the aim is to assign students, faculties, exams, or lectures to a limited number of rooms over time in accordance under real-world constraints. Such problems are known to be NP-complete and have been the subject of study for the optimization society for many decades. This research extends the classical CSP to the CSP with Room Considerations (CSP-R) by incorporating two room-related considerations; cohort-to-room preference and topic-to-room preference. While the former refers to students in each cohort …
Analysis And Dynamic Dispatch Of Energy Storage Systems In Electricity Markets Under Uncertainty, Tingli Hu
Analysis And Dynamic Dispatch Of Energy Storage Systems In Electricity Markets Under Uncertainty, Tingli Hu
Wayne State University Dissertations
With the increasing penetration levels of renewable energy resources in power systems, to realize efficient energy management, energy storage systems have become indispensable. This research aims at analyzing the impact of energy storage systems on electricity markets, especially the impact on electricity prices, and developing strategies to dynamically dispatch the available storage resources for energy management. Marginal generation units as the generators that determine the system-wide electricity prices are theoretically analyzed in this research. The electricity price of any node in the system is approximately an affine combination of the bidding prices of the marginal generation units if the power …
Effect Of Spectral Bandwidths On Linear Feature Extraction: An Evaluation Of Landsat Etm+ And Oli Sensors, Ali Imanian, Adel Asadi, Majid Hashemi Tangestani, Saeid Homayouni, Ali Faghih
Effect Of Spectral Bandwidths On Linear Feature Extraction: An Evaluation Of Landsat Etm+ And Oli Sensors, Ali Imanian, Adel Asadi, Majid Hashemi Tangestani, Saeid Homayouni, Ali Faghih
Michigan Tech Publications, Part 1
Hitherto there have been many studies comparing the usefulness of OLI and ETM+ sensors for linear feature extraction. However, not too much attention has been paid to the differences in the bandwidth of the two sensors. In this study, the suitability of Landsat ETM+ and OLI sensors for automatic detection of linear features by LINE algorithm was compared. In this study, eight regions in northern, central and southern parts of Iran were selected based on the diversity of lithology, the pristine status, and lack of human activities for the comparison of the two datasets. Results revealed that LINE algorithm performed …
Conflict Resolution In A Multi-Level It-Enabled Outsourcing Network: A Structured Solution Approach, Shreekant Vijaykar, Mahesh Gupta Prof., Pradip Kumar Bhaumik Dr.
Conflict Resolution In A Multi-Level It-Enabled Outsourcing Network: A Structured Solution Approach, Shreekant Vijaykar, Mahesh Gupta Prof., Pradip Kumar Bhaumik Dr.
Journal of International Technology and Information Management
Using the case study of an Indian Technology and Outsourcing Service Provider, SmartKey (real but renamed company), a technology vendor to a global healthcare provider, this paper analyses offshore outsourcing issues using IT-enabled services to gain deeper insights needed to understand the core conflict and propose a well-reasoned solution approach. Reasoning, the conscious thought process leading to a well-justified decision, is an important managerial skill required for making dynamic decisions, resolving conflicts, and thereby developing human resources. This paper explores Goldratt’s Evaporating Clouds (ECs) as a systematic approach to reasoning in particular, and as a system for developing human resource …
Icts For Surveillance And Suppression: The Case Of The Indian Emergency 1975-1977, Ramesh Subramanian
Icts For Surveillance And Suppression: The Case Of The Indian Emergency 1975-1977, Ramesh Subramanian
Journal of International Technology and Information Management
Information and Communications technologies (ICT) pervade society. The Internet, wireless communication, and social media are ubiquitous in and indispensable in society today. As they continue to grow and mushroom, there are new and increased calls from various segments of the society such as technologists, activists, sociologists, and legal experts, who issue warnings on the more nefarious and undesirable uses of ICTs, especially by governments. In fact, government control and surveillance using ICTs is not a new phenomenon. By looking at history, we are able to see several instances when ICTs have been used by governments to control, surveil, and infringe …
Great Lakes Runoff Intercomparison Project Phase 3: Lake Erie (Grip-E), Juliane Mai, Bryan A. Tolson, Hongren Shen, Etienne Gaborit, Vincent Fortin, Nicolas Gasset, Herve Awoye, Tricia A. Stadnyk, Lauren M. Fry, Emily A. Bradley, Frank Seglenieks, Andre G.T. Temgoua, Daniel G. Princz, Shervan Gharari, Amin Haghnegahdar, Mohamed E. Elshamy, Saman Razavi, Martin Gauch, Jimmy Lin, Xiaojing Ni, Yongping Yuan, Meghan Mcleod, Nandita B. Basu, Rohini Kumar, Oldrich Rakovec, Luis Samaniego, Sabine Attinger, Narayan K. Shrestha, Prasad Daggupati, Tirthankar Roy, Sungwook Wi, Tim Hunter, James R. Craig, Alain Pietroniro
Great Lakes Runoff Intercomparison Project Phase 3: Lake Erie (Grip-E), Juliane Mai, Bryan A. Tolson, Hongren Shen, Etienne Gaborit, Vincent Fortin, Nicolas Gasset, Herve Awoye, Tricia A. Stadnyk, Lauren M. Fry, Emily A. Bradley, Frank Seglenieks, Andre G.T. Temgoua, Daniel G. Princz, Shervan Gharari, Amin Haghnegahdar, Mohamed E. Elshamy, Saman Razavi, Martin Gauch, Jimmy Lin, Xiaojing Ni, Yongping Yuan, Meghan Mcleod, Nandita B. Basu, Rohini Kumar, Oldrich Rakovec, Luis Samaniego, Sabine Attinger, Narayan K. Shrestha, Prasad Daggupati, Tirthankar Roy, Sungwook Wi, Tim Hunter, James R. Craig, Alain Pietroniro
Department of Civil and Environmental Engineering: Faculty Publications
Hydrologic model intercomparison studies help to evaluate the agility of models to simulate variables such as streamflow, evaporation, and soil moisture. This study is the third in a sequence of the Great Lakes Runoff Intercomparison Projects. The densely populated Lake Erie watershed studied here is an important international lake that has experienced recent flooding and shoreline erosion alongside excessive nutrient loads that have contributed to lake eutrophication. Understanding the sources and pathways of flows is critical to solve the complex issues facing this watershed. Seventeen hydrologic and land-surface models of different complexity are set up over this domain using the …
Exploring The Impact Of Socio-Demographic Characteristics, Health Concerns, And Product Type On Home Delivery Rates And Expenditures During A Strict Covid-19 Lockdown Period: A Case Study From Portland, Or, Miguel Figliozzi, Avinash Unnikrishnan
Exploring The Impact Of Socio-Demographic Characteristics, Health Concerns, And Product Type On Home Delivery Rates And Expenditures During A Strict Covid-19 Lockdown Period: A Case Study From Portland, Or, Miguel Figliozzi, Avinash Unnikrishnan
Civil and Environmental Engineering Faculty Publications and Presentations
E-commerce volumes and home deliveries have experienced steady growth in the last two decades. Strict COVID-19 lockdowns made home delivery an essential service and a lifeline for many households that, for travel restrictions or health concerns, were not able to utilize traditional shopping methods. This research studies the impact of socio-demographic variables and e-commerce attitudes on household deliveries for seven product categories (groceries, meals, electronics, household and office goods, recreational items, and fashion, beauty and personal care products, and medicine/health-related products) during the lockdown period in the greater Portland metropolitan region. To understand these impacts, exploratory factor analysis and …
Assessment Of A Decentralized Solution For Waste Plastic Management In Developing Regions, Chandniben Ashishkumar Joshi
Assessment Of A Decentralized Solution For Waste Plastic Management In Developing Regions, Chandniben Ashishkumar Joshi
Theses and Dissertations--Chemical and Materials Engineering
Rapid population growth, urbanization and availability of pre-packaged consumer goods have led to increased generation and consumption of plastic – so much so that it has become ubiquitous in the environment. An affordable, durable, and lightweight material of construction, plastic is used in innumerable products in every country on earth. However, this explosion of consumption coupled with the material’s significantly low degradability have led to serious plastic accumulation challenges, which are now an imminent threat to terrestrial and marine species globally. These challenges are especially acute in developing countries, where capital and infrastructure constraints, poor governmental regulation and lack of …
Toward Open And Reproducible Environmental Modeling By Integrating Online Data Repositories, Computational Environments, And Model Application Programming Interfaces, Young-Don Choi, Jonathan L. Goodall, Jeffrey M. Sadler, Anthony M. Castronova, Andrew Bennett, Zhiyu Li, Bart Nijssen, Shaowen Wang, Martyn P. Clark, Daniel P. Ames, Jeffery S. Horsburgh, Hong Yi, Christina Bandaragoda, Martin Seul, Richard Hooper, David G. Tarboton
Toward Open And Reproducible Environmental Modeling By Integrating Online Data Repositories, Computational Environments, And Model Application Programming Interfaces, Young-Don Choi, Jonathan L. Goodall, Jeffrey M. Sadler, Anthony M. Castronova, Andrew Bennett, Zhiyu Li, Bart Nijssen, Shaowen Wang, Martyn P. Clark, Daniel P. Ames, Jeffery S. Horsburgh, Hong Yi, Christina Bandaragoda, Martin Seul, Richard Hooper, David G. Tarboton
Civil and Environmental Engineering Faculty Publications
Cyberinfrastructure needs to be advanced to enable open and reproducible environmental modeling research. Recent efforts toward this goal have focused on advancing online repositories for data and model sharing, online computational environments along with containerization technology and notebooks for capturing reproducible computational studies, and Application Programming Interfaces (APIs) for simulation models to foster intuitive programmatic control. The objective of this research is to show how these efforts can be integrated to support reproducible environmental modeling. We present first the high-level concept and general approach for integrating these three components. We then present one possible implementation that integrates HydroShare (an online …
The Politics Of Biomass Energy In California: How External Benefits Are Used To Support An Economically Marginal Sector, Dana L. Dysthe
The Politics Of Biomass Energy In California: How External Benefits Are Used To Support An Economically Marginal Sector, Dana L. Dysthe
Cal Poly Humboldt theses and projects
Since the 1990s, there has been a decline in biomass energy generation in California. In order to promote state governmental policies aiming to increase biomass energy generation in California, the sector has been linked to a series of external benefits that biomass energy purportedly brings. Through document analysis, semi-structured interviews, and participant observation, five distinct external benefits were identified that have been used to promote the biomass energy sector. These external benefits are: renewable energy generation, air quality improvements, promotion of forest restoration and fuel removal projects, disposal of wood waste from agricultural and forestry sectors, and rural economic development. …
Fire Drivers Affecting Forest Fire Occurrences In The Tropical Mixed Broad-Leaved Forests Of Nepal, Krishna Bahadur Bhujel, Rejina Maskey Byanju, Ambika P. Gautam, Ramesh Prasad Sapkota, Udhab Raj Khadka
Fire Drivers Affecting Forest Fire Occurrences In The Tropical Mixed Broad-Leaved Forests Of Nepal, Krishna Bahadur Bhujel, Rejina Maskey Byanju, Ambika P. Gautam, Ramesh Prasad Sapkota, Udhab Raj Khadka
Applied Environmental Research
Forest fires triggered by various natural and anthropogenic drivers are increasing and threatening forest ecosystems across the globe. In Nepal, the high value Tropical Mixed Broad-leaved Forests are prone to fire caused by both natural and anthropogenic drivers. Thus, understanding fire drivers and their effect is important for the sustainable forest fire management. However, the preceding studies on forest specific fire drivers and their effect are limited. This research has identified the fire drivers and assessed their effect to fire occurrences in the Tropical Mixed Broad-leaved Forests of Nawalparasi District, Nepal. Fire drivers were identified and prioritized by participatory approaches. …
Site Selection For Feasibility Study Of Pump-Storage Hydropower Project In The Philippines, Sornsawan Utthakrue
Site Selection For Feasibility Study Of Pump-Storage Hydropower Project In The Philippines, Sornsawan Utthakrue
Chulalongkorn University Theses and Dissertations (Chula ETD)
Pumped-storage hydropower projects (PSP) are a technology for hydroelectric energy storage. It is a design of two water reservoirs at different elevations that can create electricity as water flows from one to the other via a turbine. The PSP system is similar to a huge battery in that it can store and then release energy as needed. The Philippines is a country with a wide range of elevations due to its island composition. Natural disasters occur frequently, making it challenging to establish any structure. But the PSP is a large building that is also capable of generating a great amount …
การพัฒนาเมืองเพื่อการใช้พลังงานอย่างมีประสิทธิภาพ กรณีศึกษาพฤติกรรมของผู้โดยสารและการใช้ประโยชน์ที่ดิน, ณัฏฐริยาภัทร์ ไตรยวงษ์
การพัฒนาเมืองเพื่อการใช้พลังงานอย่างมีประสิทธิภาพ กรณีศึกษาพฤติกรรมของผู้โดยสารและการใช้ประโยชน์ที่ดิน, ณัฏฐริยาภัทร์ ไตรยวงษ์
Chulalongkorn University Theses and Dissertations (Chula ETD)
งานวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาพฤติกรรมการเดินทางของผู้ใช้รถไฟฟ้าเส้นทางบางนา-สยาม และเปรียบเทียบการใช้พลังงานและค่าใช้จ่ายในการเดินทางระหว่างรถยนต์ส่วนบุคคลกับระบบขนส่งสาธารณะ นอกจากนี้เพื่อวิเคราะห์การใช้ประโยชนน์ของที่ดินตามเส้นทางโดยรอบ การศึกษาได้แบ่งออกเป็น 2 ส่วนคือ 1. ทดสอบการเดินรถ 3 รูปแบบ จากย่านที่พักอาศัยที่อยู่ไกลจากสถานีรถไฟฟ้าไปยังสถานที่ทำงานบริเวณย่านใจกลางเมืองในเส้นทางบางนา-สยาม และ 2. การทำการสัมภาษณ์ผ่านแบบสอบถามของผู้โดยสารที่มาใช้บริการรถไฟฟ้าขนส่งมวลชน จากผลการทดสอบเดินรถ 3 รูปแบบ พบว่ายังไม่มีแรงจูงใจมากนักในการเปลี่ยนจากการใช้รถส่วนบุคคลไปใช้รถไฟฟ้าขนส่งมวลชน เนื่องจากปัจจัยในด้านราคาและเวลาซึ่งอยู่ในระดับกลาง จึงจำเป็นที่จะต้องสร้างแรงจูงใจ เช่น ลดราคาค่าบริการ และจัดหาสถานที่จอดรถยนต์เพิ่ม และจากการสัมภาษณ์ผู้ที่มาใช้บริการรถไฟฟ้าพบว่าผู้โดยสารมีพฤติกรรมที่แตกต่างกันต่อการตัดสินใจเลือกวิธีการเดินทาง ซึ่งขึ้นอยู่กับตัวแปรต่าง ๆ เช่น วัตถุประสงค์ของการเดินทาง ระยะเวลาในการเดินทาง และที่ตั้งจุดเริ่มต้นการเดินทาง-จุดหมายปลายทาง รูปแบบในการเดินทางส่วนใหญ่จะเริ่มต้นจากบ้านไปที่ทำงาน สุดท้ายจากการวิเคราะห์การใช้ประโยชน์ที่ดิน พบว่า ที่อยู่อาศัย อาคารสำนักงานและอาคารพาณิชย์ ตั้งอยู่บนพื้นที่ใกล้กับเส้นทางรถไฟฟ้าขนส่งมวลชน โดยเฉพาะในบริเวณพื้นที่ย่านใจกลางเมือง จึงเป็นการสนับสนุนการเดินทางด้วยรถไฟฟ้าขนส่งมวลชน และนำไปสู่การใช้พลังงานอย่างมีประสิทธิภาพ
Effect Of Cob Loading Amount In Gc3n4 Nanosheet In Photocatalytic Hydrogen Generation, Chayathorn Prapaitrakool
Effect Of Cob Loading Amount In Gc3n4 Nanosheet In Photocatalytic Hydrogen Generation, Chayathorn Prapaitrakool
Chulalongkorn University Theses and Dissertations (Chula ETD)
Noble metals, such as Pt, Ru, and Ir, have been widely used as expensive catalyst promoters to enhance the photocatalytic hydrogen evolution reaction (HER). In contrast, other cheaper catalyst promoters that can also promote high HER performance have been developed, such as metal phosphides, and metal borides. Recently, nickel boride (NiB) loaded on graphitic carbon nitride nanosheet (gCNS) has exhibited promising HER performance under visible light. Thus, this research attempted to investigate HER performance of cobalt boride (CoB) as a cocatalyst on gCNS and compare to the HER performance of NiB. The amount of CoB loading was varied from 1-11 …
การพัฒนาระบบสนับสนุนการตัดสินใจสำหรับการป้องกันการลุกลามไฟป่าในพื้นที่อยู่อาศัย, จิรภาส บุญทับ
การพัฒนาระบบสนับสนุนการตัดสินใจสำหรับการป้องกันการลุกลามไฟป่าในพื้นที่อยู่อาศัย, จิรภาส บุญทับ
Chulalongkorn University Theses and Dissertations (Chula ETD)
งานวิจัยนี้พัฒนาระบบสนับสนุนการตัดสินใจสำหรับการป้องกันไฟป่าสำหรับประเทศไทย (ThaiWDSS) เพื่อช่วยเจ้าหน้าที่ในการวางแผนป้องกันการลุกลามของไฟป่า เมื่อเจ้าหน้าที่เผชิญกับภัยจากไฟป่า ความท้าทายหลักได้แก่ การทำนายแนวโน้มการลุกลามของไฟป่า การประเมินความเสียหาย และการวางแผนการป้องกันพื้นที่ชุมชน ระบบช่วยรับมือกับปัญหาเหล่านี้โดยการจำลองการลุกลามของไฟป่า และระบุพื้นที่ชุมชน เพื่อการประเมินผลกระทบ โดยผู้ใช้งานสามารถจำลองการวางแผนการสร้างแนวป้องกันไฟที่สามารถควบคุมพื้นที่ที่ถูกเผาไหม้ได้ โดยผู้ใช้งานสามารถประเมินพื้นที่ที่จะได้รับผลกระทบ ร่วมกับสิ่งปลูกสร้าง โดยการจำลองแนวป้องกันไฟในการวางแผน ระบบได้รับการทดสอบการใช้งาน และแบบจำลองการลุกลามของไฟป่าได้รับการประเมินประสิทธิภาพการทำงาน ด้วยกรณีศึกษาในประเทศไทยที่เคยเกิดไฟป่าขึ้นจริงสองแห่ง จากผลการวิจัยพบว่าระบบสามารถสนับสนุนการจำลองการสร้างแนวป้องกันไฟรูปแบบต่าง ๆ โดยการจำลองพื้นที่เผาไหม้ที่จะเกิดขึ้น ซึ่งจะช่วยในการตัดสินใจระหว่างการวางแผนเผชิญเหตุ เนื่องจากข้อจำกัดของข้อมูล การระบุพื้นที่ชุมชน และการจำลองการลุกลามของไฟ มีความถูกต้อง 80% โดยประมาณ ในการระบุพื้นที่ชุมชน และการทำนายพื้นที่เผาไหม้ แบบจำลองสามารถพัฒนาได้อีกมากถ้าหากมีข้อมูลที่มากขึ้น เจ้าหน้าที่สามารถบริหารทรัพยากร และดำเนินมาตรการป้องกันสาธารณภัยได้อย่างมีประสิทธิภาพมากขึ้น
ดัชนีการเข้าถึงของระบบขนส่งสาธารณะในกรุงเทพมหานครและการประยุกต์ใช้งาน, ณัฐกานต์ สุรางค์ศรีรัฐ
ดัชนีการเข้าถึงของระบบขนส่งสาธารณะในกรุงเทพมหานครและการประยุกต์ใช้งาน, ณัฐกานต์ สุรางค์ศรีรัฐ
Chulalongkorn University Theses and Dissertations (Chula ETD)
สาเหตุหนึ่งของปัญหาการจราจรในกรุงเทพฯ เกิดจากการวางแผนเชื่อมโยงระบบขนส่งสาธารณะที่ไม่มีประสิทธิภาพ ประชาชนไม่สามารถเข้าถึงระบบขนส่งสาธารณะได้โดยง่าย ส่งผลให้รถยนต์ส่วนบุคคลเป็นทางเลือกที่ได้รับความนิยม จากเหตุผลดังกล่าว ดัชนีการเข้าถึงระบบขนส่งสาธารณะจึงเป็นปัจจัยสำคัญที่ควรนำมาใช้ประกอบการวางแผนพัฒนาระบบจราจรและการขนส่ง งานวิจัยนี้มีวัตถุประสงค์เพื่อวิเคราะห์ดัชนีการเข้าถึงระบบขนส่งสาธารณะสำหรับพื้นที่กรุงเทพเขตชั้นใน ในบริบทของการเดินทางจากจุดศูนย์กลางของแขวงหนึ่งไปยังจุดศูนย์กลางของอีกแขวงหนึ่ง ปัจจัยที่ใช้ประกอบการคำนวณดัชนีการเข้าถึง ได้แก่ เวลาในการเดินทางทั้งหมด มูลค่าเวลา และปริมาณการเดินทาง เพื่อให้ทราบถึงสภาพการเดินทางในปัจจุบัน และนำเสนอแผนที่สีที่แสดงความเหลื่อมล้ำเชิงพื้นที่ ผลการศึกษาพบว่าบริเวณที่มีดัชนีการเข้าถึงสูง กระจุกตัวอยู่บริเวณเขตพระนครและใจกลางเมือง และมีแนวโน้มลดลงเมื่อห่างออกจากบริเวณดังกล่าว โดยดัชนีการเข้าถึงมีค่าอยู่ในช่วง 0.54 ถึง 4.12 และมีค่าเฉลี่ยเท่ากับ 1.57 โดยแขวงที่มีดัชนีการเข้าถึงมากที่สุดคือแขวงวังใหม่ และแขวงบางขุนนนท์มีดัชนีการเข้าถึงต่ำที่สุด เมื่อเปรียบเทียบดัชนีการเข้าถึงในปัจจุบัน กับดัชนีการเข้าถึงเมื่อเปลี่ยนจากการเดินเท้าเข้าสู่สถานีขนส่งสาธารณะเป็นการเดินทางรูปแบบอื่น พบว่าการเข้าสู่สถานีขนส่งด้วยรถจักรยานยนต์ ส่งผลให้ดัชนีการเข้าถึงลดลง ในขณะที่การเข้าสู่สถานีขนส่งด้วยจักรยานและการปรับปรุงคุณภาพทางเท้าให้ประชาชนสามารถเดินเท้าได้รวดเร็วขึ้น ส่งผลให้ดัชนีการเข้าถึงเพิ่มขึ้น ผลการศึกษาพบว่า การปรับปรุงความสามารถในการเข้าถึงโดยการใช้รถจักรยานยนต์เข้าสู่สถานีขนส่งเป็นนโยบายที่ไม่มีประสิทธิภาพ และควรส่งเสริมการใช้จักรยานเพื่อเชื่อมต่อสถานีขนส่งและการปรับปรุงคุณภาพทางเท้า
Sensing Population Distribution From Satellite Imagery Via Deep Learning:Model Selection, Neighboring Effects, And Systematic Biases, Xiao Huang, Di Zhu, Fan Zhang, Tao Liu, Xiao Li, Lei Zou
Sensing Population Distribution From Satellite Imagery Via Deep Learning:Model Selection, Neighboring Effects, And Systematic Biases, Xiao Huang, Di Zhu, Fan Zhang, Tao Liu, Xiao Li, Lei Zou
Geosciences Faculty Publications and Presentations
The rapid development of remote sensing techniques provides rich, large-coverage, and high-temporal information of the ground, which can be coupled with the emerging deep learning approaches that enable latent features and hidden geographical patterns to be extracted. This article marks the first attempt to cross-compare performances of popular state-of-the-art deep learning models in estimating population distribution from remote sensing images, investigate the contribution of neighboring effect, and explore the potential systematic population estimation biases. We conduct an end-to-end training of four popular deep learning architectures, i.e., VGG, ResNet, Xception, and DenseNet, by establishing a mapping between Sentinel-2 image patches and …
Exploring And Visualizing Spatial Effects And Patterns In Ride-Sourcing Trip Demand And Characteristics, Bishoy Kelleny, Sherif Ishak
Exploring And Visualizing Spatial Effects And Patterns In Ride-Sourcing Trip Demand And Characteristics, Bishoy Kelleny, Sherif Ishak
Civil & Environmental Engineering Faculty Publications
The complex demand pattern of ride-sourcing remains to be a challenge to transportation modeling practitioners due to the infancy and the inherently dynamic nature of the ride-sourcing system. Spatial effects exploration and analysis protocols can provide informative insights on the underlying structure of demand and trip characteristics. Those protocols can be thought of as an opportunistic strategy to alleviate the complexity and help specifying the appropriate econometric models for the system. Spatial effects exploration is comparable to point pattern analysis, in which, signals from spatial entities, like census tracts, can be analyzed statistically to reveal whether a specific phenomenon respective …
Land Use And Land Cover Classifications Of Horqin Sandy Land Dune-Meadow Areas, Wenmei Cao, Tingxi Liu, Xixi Wang, Guanli Wang, Dongfang Li, Xing Tong
Land Use And Land Cover Classifications Of Horqin Sandy Land Dune-Meadow Areas, Wenmei Cao, Tingxi Liu, Xixi Wang, Guanli Wang, Dongfang Li, Xing Tong
Civil & Environmental Engineering Faculty Publications
In this study, we determine land use/land cover (LULC) types using only optical remote sensing data in a dune-meadow area of Horqin Sandy Land in northeast China. We used 64 Sentinel-2 remote sensing images from 2018. An LULC decision tree recognition rule was established by combining image segmentation technology, vegetation phenology information, and habitat characteristics. The overall classification accuracy was 0.91, and the Kappa coefficient was 0.89. The classification results show that most of the study region was dryland area, accounting for 33.79%, followed by shrub communities at 25.03%. High-diversity semi-shrub communities and arbor forests accounted for 14.54% and 10%, …