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Articles 1261 - 1290 of 2807
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Identification And Counting White Blood Cell Subtypes With Convolutional Neural Network, Singgih Bekti Worsito
Identification And Counting White Blood Cell Subtypes With Convolutional Neural Network, Singgih Bekti Worsito
Chulalongkorn University Theses and Dissertations (Chula ETD)
White blood cell (WBC) has five subtypes namely neutrophil, eosinophil, basophil, lymphocyte, and monocyte which play specific roles in the immune system and against diseases. The object detection model applied to microscopic objects is introduced to assist experts in performing tasks in blood analysis. Unbalanced cell composition of WBC subtypes to be detected is a challenge in building a model in Convolutional Neural Network (CNN). This research aims to build models in recognizing and counting WBC subtypes with neural networks constructed from augmented data enrichment. CNN is demonstrated in this study with the YOLOv5s, YOLOv5l, and YOLOv5x models to detect …
Development Of A Preliminary Energy Assessment Tool For Alternative Cooling System, Pinsuda Netphasom
Development Of A Preliminary Energy Assessment Tool For Alternative Cooling System, Pinsuda Netphasom
Chulalongkorn University Theses and Dissertations (Chula ETD)
In recent years, an absorption chiller coupled with solar technologies has been presented as a solution to decrease the amount of electricity consumption. The absorption chiller technology primarily consumes thermal energy instead of electricity to generate the chilled water. In addition, this technology can take advantage of waste energy and renewable resources like solar power. Solar photovoltaic and thermal collectors produce electrical and thermal energy to assist the alternative cooling system as a renewable resource. These solar and absorption technologies are promising solutions to reduce energy consumption and reduce the environmental impact caused by greenhouse gases. This study aims to …
Sustainable Livelihood Of Fishermen: A Case Study In The City Of Semarang, Indonesia, Adam Prayuda
Sustainable Livelihood Of Fishermen: A Case Study In The City Of Semarang, Indonesia, Adam Prayuda
Chulalongkorn University Theses and Dissertations (Chula ETD)
The study aims to look at the social and economic circumstances of fishermen in Semarang City, their local livelihoods, and the significant role of the state through Semarang Fisheries Service to improve the economic livelihoods and social welfare of this marginal group. It applies a sustainable livelihood framework to look at the compatibility and empowerment process that can affect the Fishermen's Community. This research used mixed methods to understand the problem and apply narrative techniques for case studies to obtain the data. Different sources of information are used to triangulate information, perspectives, and expected results to increase knowledge in providing …
Renewable Energy Transition Towards Krabi’S Sustainable Energy, Chariya Senpong
Renewable Energy Transition Towards Krabi’S Sustainable Energy, Chariya Senpong
Chulalongkorn University Theses and Dissertations (Chula ETD)
The present study was conducted with an aim to investigate Krabi's electricity outlook, renewable energy transition timeline, and potential of renewable energy resources, key drivers, barriers, and challenges towards Krabi's sustainable energy. Guideline as well as policy recommendation for successful renewable energy transition was also developed. The study found that Krabi's electricity demand has continuously increasing and tends to increase up to 320 MW by the year 2037. Meanwhile, electricity supply has still relied on national grid since 1995. Meanwhile, Krabi Goes Green which is a provincial roadmap has set a target to be self-reliance and all electricity supply would …
Investigating Sustainable Consumption Practices: A Case Of Single-Use Plastics In Online Food Delivery Market, Thailand, Boonchanit Wongprapinkul
Investigating Sustainable Consumption Practices: A Case Of Single-Use Plastics In Online Food Delivery Market, Thailand, Boonchanit Wongprapinkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Online food delivery platforms have demonstrated their financial success in the Thai market during the past few years. As a result, 560 - 2,856 million pieces of Single-use Plastics (SUPs) are expected each year. Furthermore, the Coronavirus Disease 2019 (COVID-19) caused a dilemma in sustainable consumption and intensified the plastic waste situation. The social dilemma poses difficult short-term choices between health and the environment. The concern is that while Thais have started to adopt new sustainable lifestyles with the no-plastic-bag policy, environmentalists worry that this COVID disruption will have a long-term behavioural impact on SUPs consumption habits. Consuming single-use packaging …
Developing Tanjung Kelayang As A New Bali: An Analysis Of Sustainable Tourism Policy And Implementation, Herdi Andrariladchi
Developing Tanjung Kelayang As A New Bali: An Analysis Of Sustainable Tourism Policy And Implementation, Herdi Andrariladchi
Chulalongkorn University Theses and Dissertations (Chula ETD)
Indonesia has seen the success of Bali as the most prominent tourism destination in the country. Therefore, the initiative to deploy the benefits of tourism development throughout several regions of Indonesia is known as the “10 New Bali’s”. Nevertheless, it is still questionable whether Bali is an example of sustainable tourism or not. In developing the “10 New Bali’s”, the Indonesian government is aiming at increasing the number of tourists rather than at achieving the goal of sustainable tourism destination development. One of the destinations designated under this initiative is Tanjung Kelayang in Belitung Island, and therefore it is selected …
Challenges Of Urban Forest Park Restoration On Post-Closure Landfill : Perception And Future Engagement From The Local Communities, Intan Pransischa Fitri
Challenges Of Urban Forest Park Restoration On Post-Closure Landfill : Perception And Future Engagement From The Local Communities, Intan Pransischa Fitri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Urban forest park development is considered a promising planning tool in tackling some of the problems associated with urbanisation, such as pollution and urban heat island effects. Individual perceptions are pivotal in the urban forest park development. Their significant factors were aimed to address the community's needs and increase the recognition through the disruptive change of land function and urban living toward urban forest park development. The framework of local community engagement in urban forest park development was proposed. Field observation and questionnaires survey of 168 respondents were selected from five villages located 50 meters-1000 meters radius from the site. …
Consumers' Intention In Avoiding Plastic Packaging From Online Food Take-Out : A Case Study Of Beijing And Shanghai, China, Kaiyan Yang
Chulalongkorn University Theses and Dissertations (Chula ETD)
China's plastic pollution has gotten worse, especially during the COVID pandemic when the city's lockdowns boosted the food takeout business. Although the government has made efforts in curbing the use of conventional single-use plastic packaging, the problem is still looming up in the critical time of building ecological civilization. The key to resolve the overwhelming usage of disposable plastic packaging lies in reduction, along with using green alternatives: biodegradable packaging and returnable containers. The study investigated consumers' willingness to adopt new alternatives by applying the theory of planned behavior (TPB). The measurement scale, developed upon previous literature, gains validated reliability …
Preventing Occupational Respiratory Disease From Exposures In Office Building : Case Study Covid-19, Panupant Phapant
Preventing Occupational Respiratory Disease From Exposures In Office Building : Case Study Covid-19, Panupant Phapant
Chulalongkorn University Theses and Dissertations (Chula ETD)
The COVID‐19 pandemic has affected human life in every possible way, and, alongside this, the need has been felt that office buildings and workplaces must have protective and preventive layers against COVID‐19 transmission so that a smooth transition from ‘work from home’ to work from office’ is possible. The present study reviews international agency regulations, country regulations, updated journal articles, etc., to critically understand lessons learned from COVID‐19 and evaluate the expected changes in sustainability requirements of office buildings and workplaces. The built environment, control environment, and regulatory environment around office buildings and workplaces have been put under test on …
Developing A System Of Community-Based Agritourism For Sustainable Local Food Systems: A Multi-Case Study Of Rural Livelihood Diversification And Sustainable Urban Consumption In City-Regional Bangkok, Sofia Anna Enrica Cavalleri
Developing A System Of Community-Based Agritourism For Sustainable Local Food Systems: A Multi-Case Study Of Rural Livelihood Diversification And Sustainable Urban Consumption In City-Regional Bangkok, Sofia Anna Enrica Cavalleri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Current food systems fail to directly link rural producers and urban consumers. This research explores and categorizes emerging community-based agritourism practices as strategies to reconnect rural food producers with urban consumers. The main research question of this study is: how can community-based agritourism link rural food producers and urban consumers as a rural livelihood diversification strategy? Mixed methods for data collection were selected to answer this question and analyzed with a deductive and inductive approach. These include the review of secondary grey and academic literature, shadow observation in three rural provinces, content validity index calculation performed by experts (n = …
Investigating Consumers' Perspective And Impact On Green Cosmetics And Personal Care Products In Thailand, Tawalhathai Suphasomboon
Investigating Consumers' Perspective And Impact On Green Cosmetics And Personal Care Products In Thailand, Tawalhathai Suphasomboon
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aims to investigate consumers’ perspectives and impact on green cosmetics and personal care products in Thailand. Specifically, it explores the sustainability movement for the cosmetics and personal care industry, analyzes Thai consumer behavioral intention toward the consumption of green cosmetics and personal care products, and evaluates the impact of related policies that may affect green business transitions and consumers’ intention to purchase green cosmetics and personal care products. The movement of industry and related policies were analyzed by means of Life Cycle Thinking approach. Hypotheses were formulated based on The Perceived Value Theory with extended factors of environmental …
Developing A Model For The Integration Of Bajau Traditional Ecological Knowledge In The Management Of Locally Managed Marine Area: A Case Study Of Wakatobi Regency, Indonesia, Wengki Ariando
Chulalongkorn University Theses and Dissertations (Chula ETD)
Attaining sustainable resource management encompasses multilevel challenges and interdisciplinary approaches from grassroots efforts to international agreements. In the context of coastal and marine management, the complexities represented by the variety of local entities, regimes, and institutional supports are captured as current challenges in sustainability efforts. Such challenges, unfortunately, persist in the group of customary communities such as those of the Bajau, who live in coastal and marine areas. In an effort to address the aforementioned challenges, this research proposes a model for integrating the Traditional Ecological Knowledge (TEK) of the Bajau into Locally Managed Marine Areas (LMMA) scheme in Wakatobi, …
Effects Of Configuration And Operating Conditions On Turbidity Removal Of Jet Clarifier, Ploypailin Romphophak
Effects Of Configuration And Operating Conditions On Turbidity Removal Of Jet Clarifier, Ploypailin Romphophak
Chulalongkorn University Theses and Dissertations (Chula ETD)
In water treatment, flocculation creates large and weighty flocs enough to be removed by the downstream processes of sedimentation and filtration. Among the various existing technologies, the jet clarifier is considered as an effective and compact system as it couples flocculation and clarification in a single unit. For the design of jet mixing, much experimental work has been done and many correlations have been proposed. However, these correlations are case specifics, and, to date, there is no comprehensive view for the flocculation aspect. In order to evaluate the performance of the jet clarifier for turbidity removal and understand hydrodynamics to …
Accuracy Comparison Of Dental Implants Obtained By Dynamic Cais In All-On-4 Edentulous Area Among Different Types Of Bone Density: An In Vitro Study, Jutasinee Pornpolsarun
Accuracy Comparison Of Dental Implants Obtained By Dynamic Cais In All-On-4 Edentulous Area Among Different Types Of Bone Density: An In Vitro Study, Jutasinee Pornpolsarun
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Determination of available bone is particularly important in implant placement quality of bone can affect the accuracy implant placement. Currently, Dynamic navigation system illustrated the improvement of implant accuracy, The accuracy of implant placement using computer-assisted implant placement system (CAIS) is unknown. As a result, the goal of this study was to see how bone density affected implant placement accuracy with Dynamic CAIS. Purpose: To determine the effect of different bone density in the accuracy of implant placement using dynamic navigation system Materials and Methods: The study's overall design includes a single doctor planning each implant using a CBCT …
Clinical Accuracy Between Planned And Placed Posterior Implant Position Of Two Static Implant Planning Software Programs In Inexperienced Operators, Wanwanat Singthong
Clinical Accuracy Between Planned And Placed Posterior Implant Position Of Two Static Implant Planning Software Programs In Inexperienced Operators, Wanwanat Singthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective: This study aimed to evaluate and examine the difference in posterior implant positioning between the planned and placed positions when inexperienced operators used two static implant planning software packages following a fully guided implant surgery protocol in the clinical field. Materials and methods: Twenty-four patients who needed single posterior implant placement were randomly divided into two groups based on the used implant planning software (group 1, coDiagnostiX, n=12; group 2, Implant Studio, n=12). The dataset of the placed implant position, generated from digitizing the implant impression, was superimposed on the planned implant position. The number of horizontal, angular, and …
Digital Literacy For Enhancing Preparedness Capacity To Climate Related Risks Among Ageing Population In Bankgok, Thailand, Chandhit Sawangnate
Digital Literacy For Enhancing Preparedness Capacity To Climate Related Risks Among Ageing Population In Bankgok, Thailand, Chandhit Sawangnate
Chulalongkorn University Theses and Dissertations (Chula ETD)
The elderly population is amongst the most vulnerable group confronting climate related risks. This research aims to assess flood hazards distribution and investigate factors influencing flood literacy and preparedness actions among the elderly in Bangkok, Thailand. The AHP-GIS technique, land-use, drainage density, and annual maximum rainfall are the most important factors that influence flood hazard in Bangkok while land subsidence, past flooding events, and slope of the city have the lowest scores. Around 50% (784.089 sq.km.) of total area, mainly situated in the economic centers, is defined as high hazard. The results of policy analysis found that lack of integration …
Do Issuers Affect Derivative Warrants Overpricing? Evidence Of Thailand, Sarunporn Thupthong
Do Issuers Affect Derivative Warrants Overpricing? Evidence Of Thailand, Sarunporn Thupthong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Derivative warrants have become increasingly popular in many countries. However, numerous literatures provide the empirical evidences that derivative warrants are overpriced relative to the comparable options. Many researchers found that the derivative warrant overpricing can be explained by hedging cost, liquidity premium, market power, and asymmetric information of investors. These explanations are likely to be related to characteristics of derivative warrant issuer. Therefore, this paper comes up with the objective to reconfirm the overpricing phenomenon in Thailand and investigate the issuer identity effect on the derivative warrant overpricing as well as examine what issuer’s characteristics cause the level of overpricing …
Investigation Of Statistical Seismology In Thailand-Laos-Myanmar Borders, Manunchaya Neanudorn
Investigation Of Statistical Seismology In Thailand-Laos-Myanmar Borders, Manunchaya Neanudorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purpose of this research is to understand more about the statistical seismology of the Thailand-Laos-Myanmar border in order to monitor earthquake activity and locate potentially dangerous area. The seismicity data was collected from the Thailand Meteorological Department. Following that, the catalog's homogeneity and completeness were improved. The first step is to identify the earthquake activity by using the adaptive frequency-magnitude distribution. The results are that Nan province, Thailand, and south Luang Prabang, Laos are the highest activity areas which can generate a maximum magnitude of 5.1 ML, 5.6 ML, 6.3 ML, and 6.7 ML in 5, 10, 30, 50 …
Analysis Of Ancient Storm Deposits Along Coastal Areas Of Andaman Sea, Thailand And Coastal Areas Of South China Sea, Vietnam, Stapana Kongsen
Analysis Of Ancient Storm Deposits Along Coastal Areas Of Andaman Sea, Thailand And Coastal Areas Of South China Sea, Vietnam, Stapana Kongsen
Chulalongkorn University Theses and Dissertations (Chula ETD)
The frequency of high energy storm and tsunami events is crucial for apprehending the vulnerability of coastal communities. Identifying and dating sedimentary evidence deposited by such high energy events can assist in the planning and installation of suitable protection measurements. The Andaman Sea coast of Thailand is particularly vulnerable to such events as illustrated by the 2004 Indian Ocean Tsunami (2004 IOT) and the South China Sea coast of Vietnam has been experienced from the past severe storm event. Here, the authors study the high energy sediments. The selected area of Andaman Sea coast Thailand is Laem Son National park, …
Trace Elements And Color-Causing Role In Spinel And Tanzanite, Teerarat Pluthametwisute
Trace Elements And Color-Causing Role In Spinel And Tanzanite, Teerarat Pluthametwisute
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research is aimed to investigate the significant trace elements and their color-causing roles in tanzanite and spinels (7 color varieties) by focusing on their concentrations, valencies, and site occupancy since no palpable research has been reported previously either before or after heating of both gems. According to this finding, natural tanzanites usually show strongly trichroic colors of violet, blue, and brown in different directions. However, this characteristic is easily changed to violet-blue dichroism after heat treatment. As the result, the violet-blue absorption band (centered around 450–460 nm) is obviously decreased after heating, and XAS analysis indicates the higher valency …
Stratigraphy And Paleoenvironment Of Thong Pha Phum Group In Kanchanaburi Province, Warunee Maneerat
Stratigraphy And Paleoenvironment Of Thong Pha Phum Group In Kanchanaburi Province, Warunee Maneerat
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this study are to establish the detail lithology, stratigraphy, lithofacies and systematic paleontology of marine Silurian-Devonian sedimentary rocks of the Thong Pha Phum Group in Ban Tha Kraden, Si Sawat District, Kanchanaburi Province, and to interpret and reconstruct its depositional environment. The Thong Pha Phum Group is well exposed in the study area. It consists mainly of shale, siltstone, sandstone, limestone, argillaceous limestone, calcareous shale, calcareous mudstone, and laminated mudstone with the many fossils such as graptolites, tentaculites, ostracods, brachiopods, nautiloids and trilobites. These strata are conformably underlain by the Thung Song Group (Ordovician age) and are …
Downhole Water Drainage From A Gas Reservoir For Water Dumpflood In An Underlying Oil Reservoir, Htet Myet Zin Naing
Downhole Water Drainage From A Gas Reservoir For Water Dumpflood In An Underlying Oil Reservoir, Htet Myet Zin Naing
Chulalongkorn University Theses and Dissertations (Chula ETD)
For wells drilled in a bottom water-drive gas reservoir, water coning may lead to a considerable amount of water production which diminishes the gas recovery. If the gas reservoir has an oil reservoir underneath, a method called “Downhole Water Drain for Water Dumpflood” (DWDDF) can be performed to drain water from the aquifer underneath the gas reservoir and dump it into the oil reservoir to perform waterflooding. DWDDF technique can help increase gas production from the upper gas reservoir and oil production from the lower reservoir at the same time. In this study, a simple reservoir model having common rock …
Utilization Of Rain Tree (Samanea Saman) Residue As Modified Adsorbent To Treat Oil And Grease In Canteen Wastewater, Elga Riesta Puteri
Utilization Of Rain Tree (Samanea Saman) Residue As Modified Adsorbent To Treat Oil And Grease In Canteen Wastewater, Elga Riesta Puteri
Chulalongkorn University Theses and Dissertations (Chula ETD)
The utilization of waste materials as adsorbent precursors is gaining intention to treat fats, oils, and greases (FOG), especially in wastewater treatment. Tree residue, an abundant waste, provides a potential feedstock to be converted into valuable materials. This research aimed to develop modified adsorbent prepared from rain tree (Samanea saman) residue for FOG treatment. The synthesis process of modified adsorbent was conducted by chemical pretreatment using different chemical agents (i.e., NaOH, ZnCl2, and H3PO4). The pre-treated twigs and leaves (1:4 ratio) were continued by pyrolysis process at different temperatures (i.e., 350, 550, and 750oC) using a heating rate of 10oC …
Surface Activation Of Rice Husk-Derived Hydrochar As An Adsorbent For Atrazine And Ammonium, Kim Anh Phan
Surface Activation Of Rice Husk-Derived Hydrochar As An Adsorbent For Atrazine And Ammonium, Kim Anh Phan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Due to the agricultural intensity, studies of sustainable solutions for atrazine and nitrogen contamination have attracted more attention. This study is aimed to develop rice husk hydrochar as an adsorbent for atrazine and ammonium adsorption. Effects of microwave-assisted hydrothermal carbonization (MHTC) conditions including temperature (150 – 200°C), residence time (20 – 60 min), and liquid to solid ratio (5:1 – 15:1 mL/g) on the atrazine and ammonium adsorption capacity were investigated. Surface activation of rice husk hydrochar samples was synthesized using potassium hydroxide (KOH) and hydrogen peroxide (H2O2) with various concentrations. The results showed that higher MHTC temperature with higher …
Changes In Surface Water And Sediment Quality At A Complex Tidal-Influenced River: A Case Study Of Ganh Hao River, Mekong Delta, Vietnam, Muoi Le Van
Chulalongkorn University Theses and Dissertations (Chula ETD)
The research was carried out to determine the extent of surface water and sediment pollution using the physicochemical parameters and heavy metal concentrations. The surface water and sediment samples were obtained from 25 sites along the river on March 22 and September 5, 2019 at the main river influenced by the complex tidal regime and aquaculture practices in Ca Mau peninsular in the Vietnamese Mekong Delta. The water quality was compared with international and national standards, while the sediment quality was compared with Vietnamese standards and pollution indices (geo-accumulation index, contamination factor, and pollution load index). Principal component analysis (PCA) …
Health Risk Assessment Of Toxic Metals In Commonly Consumed Salad Leafy Vegetables In Bangkok, Zin Htoo Hlyan
Health Risk Assessment Of Toxic Metals In Commonly Consumed Salad Leafy Vegetables In Bangkok, Zin Htoo Hlyan
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objectives of this study were 1) to investigate concentrations of toxic metals including As, Cd, and Pb in the commonly consumed salad leafy vegetables which were sold in Bangkok, and 2) to assess potential human health risks of As, Cd, and Pb exposure via salad leafy vegetables consumption. A total of 120 samples were randomly collected from local fresh markets in Bangkok. The total concentrations of toxic metals were determined by an inductively coupled plasma mass spectroscopy (ICP-MS). Total concentrations of As, Cd and Pb in coral lettuce (CL), red coral (RC) and green oak (GO) for soil cultivation …
Analysis Of Inventory In A Food Repackaging Company, Chutipapha Thiantravan
Analysis Of Inventory In A Food Repackaging Company, Chutipapha Thiantravan
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research aims to evaluate the nature of business and apply a suitable inventory policy to a case study food-repackaging company. The company adopted bulk-purchasing to packaging inventory to realize the economy of scales. Because of the lacks of purchasing standard and monitoring, this inventory policy led to the overstock, deadstock, and obsolete packaging inventories as well as the fluctuation of inventory turnover rate. The further category analysis of the packaging inventories using ABC analysis reveals that special customized bags and packaging items have a long lead time due to international sourcing and high minimum order quantity (MOQ). As a …
Effective Traffic Signal Timing For Intersections In Bangkok, Kasidech Tantipanichaphan
Effective Traffic Signal Timing For Intersections In Bangkok, Kasidech Tantipanichaphan
Chulalongkorn University Theses and Dissertations (Chula ETD)
The increasing number of on-road vehicles in Bangkok, as well as the traffic flow conditions, are causing many problems for the citizens. To alleviate the problem, effective traffic signal management by optimizing traffic signal timing can be used. As a result, the goal of this research is to improve Bangkok's traffic signal system and management by establishing an effective green light time at intersections in order to increase the vehicle flow rate. The mathematical model is designed to maximize the number of vehicles leaving intersections. Six Bangkok intersections are selected for the experiments. According to the experimental results, the optimization …
Cryptocurrency Trading With Ensemble Machine Learning Algorithm, Siwat Assavakijphanich
Cryptocurrency Trading With Ensemble Machine Learning Algorithm, Siwat Assavakijphanich
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this project, we aimed to use ensemble machine learning algorithms to trade ten cryptocurrencies along with attempting to add more external factors. Cryptocurrency included in this project were Cardano (ADA), Binance Coin (BNB), Bitcoin (BTC), DOGE, DOT, Ethereum (ETH), LINK, Polygon (MATIC), Uniswap (UNI), and Ripple (XRP). Furthermore, ten external factors, which are ten major stock indices, were added to the algorithm. All machine learning algorithms in this project are used to trade for four trading circumstacnes, an 1-hour interval, six-hour interval, daily interval and weekly interval. There are six machine learning models in this project which will be …
Pancyclicity And Vertex Pancyclicity For Some Products Of Graphs, Artchariya Muaengwaeng
Pancyclicity And Vertex Pancyclicity For Some Products Of Graphs, Artchariya Muaengwaeng
Chulalongkorn University Theses and Dissertations (Chula ETD)
No abstract provided.