KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 7 of 7

Some of the metrics are blocked by your
consent settings
Sustainable urban waste collection using a hybrid heuristic–genetic approach: a Bangkok case study
(2026-01-01)
Hamontree, Chaowalit
;
Koiwanit, Jarotwan
;
Sinchai, Ananta
Urban waste collection is a critical component of sustainable city development, directly influencing emissions reduction, resource efficiency, and public health. This study develops a hybrid optimization framework combining a Nearest Neighbor Heuristic with a Genetic Algorithm (GA) to optimize municipal waste collection routes in Bangkok, addressing the Vehicle Routing Problem (VRP) under real-world constraints such as vehicle capacity, time windows, and traffic conditions. The optimized algorithm reduced weekly travel distance by 8.51% and increased average vehicle utilization by 7.78%, translating into projected five-year economic benefits of over 4.7 million Baht and annual GHG emission reduction equivalent to planting approximately 1,750 trees. These findings demonstrate how algorithmic optimization can advance SDG 11 (sustainable cities and communities) and SDG 12 (responsible consumption and production) by aligning technical innovation with environmental and social outcomes. Beyond Bangkok, the framework is scalable to other rapidly urbanizing contexts, offering policymakers a data-driven pathway toward inclusive, low-carbon, and effective waste management systems.
Some of the metrics are blocked by your
consent settings
Correction: Sustainable urban waste collection using a hybrid heuristic–genetic approach: a Bangkok case study (Frontiers in Sustainability, (2026), 6, (1716538), 10.3389/frsus.2025.1716538)
(2026-01-01)
Hamontree, Chaowalit
;
Koiwanit, Jarotwan
;
Sinchai, Ananta
Waste Management An incorrect number was provided for School of Engineering, King Mongkut's Institute of Technology Ladkrabang. The correct number is 2565-02-01-074. The original version of this article has been updated.
Some of the metrics are blocked by your
consent settings
A novel of WS2–MoCuO3 supported with graphene quantum dot as counter electrode for dye-sensitized solar cells application
(2023-12-01)
Areerob, Yonrapach
;
Oh, Won Chun
;
Hamontree, Chaowalit
;
Nachaithong, Theeranuch
;
Nijpanich, Supinya
A novel tungsten disulfide-molybdenum copper oxide composite supported with graphene quantum dots (WM@GQDs) has been synthesized as a counter electrode (CE) for dye-sensitized solar cells (DSSCs) using a simple and low-cost ultrasonication method. The unique structure of WM@GQDs exhibits excellent power conversion efficiency due to its high catalytic activity and charge transport properties. In addition, the graphene quantum dots (GQDs) provide more active sites in the zero-dimensional materials for an I/I<inf>3</inf><sup>−</sup> redox reaction which can improve the electrical and optical properties of the composite. The results indicate that the amount of GQDs in the composite affect the effectiveness of solar devices. When 0.9%wt of GQDs was used, the WM@GQDs composite achieved an efficiency of 10.38%, which is higher than that of the expensive platinum CE under the same conditions. The mechanism behind the improved power conversion efficiency (PCE) of the composite sample is also discussed in detail. Therefore, WM@GQDs can be an efficient material to replace platinum in DSSCs as a CE.
Some of the metrics are blocked by your
consent settings
Synthesis of novel MoWO4 with ZnO nanoflowers on multi-walled carbon nanotubes for counter electrode application in dye-sensitized solar cells
(2022-12-01)
Areerob, Yonrapach
;
Hamontree, Chaowalit
;
Sricharoen, Phitchan
;
Limchoowong, Nunticha
;
Nijpanich, Supinya
Novel MoWO<inf>4</inf> with ZnO nanoflowers was synthesized on multi-walled carbon nanotubes (MW-Z@MWCNTs) through a simple hydrothermal method, and this unique structure was applied as a counter electrode (CE) for dye-sensitized solar cells (DSSC) for the first time. The synergetic effect of ZnO nanoflowers and MoWO<inf>4</inf> on MWCNTs was systematically investigated by different techniques. The amount of MWCNTs was optimized to achieve the best DSSC performance. It was found that the 1.5% MW-Z@MWCNTs composite structure had the highest power conversion efficiency of 9.96%, which is greater than that of traditional Pt CE. Therefore, MW-Z@MWCNTs-based CE can be used to replace traditional Pt-based electrodes in the future.
Some of the metrics are blocked by your
consent settings
Novel gamma-irradiated chitosan-doped reduced graphene-CuInS2 composites as counter electrodes for dye-sensitized solar cells
(2022-05-20)
Areerob, Yonrapach
;
Hamontree, Chaowalit
;
Sricharoen, Phitchan
;
Limchoowong, Nunticha
;
Laksee, Sakchai
To address the issues associated with traditional counter electrodes, a novel gamma-irradiated chitosan-doped reduced graphene-CuInS<inf>2</inf> composite (Chi@RGO-CIS) was used as the counter electrode (CE). The system was fabricated following a simple hydrothermal method. The prepared Chi@RGO-CIS was characterized by various spectroscopic and microscopic techniques. The synergistic effect between chitosan, CuInS<inf>2</inf>, and reduced graphene oxide can help in producing a large surface area. It can also help in the generation of catalytic sites toward I-/I<inf>3</inf>-redox electrolytes. We used a composite (based on electrical considerations) to study the effect of the amount of graphene on the characteristics and photovoltaic efficiency of the Chi@RGO-CIS composites. The solar cell assembled with 1.5% Chi@RGO-CIS exhibited an efficiency of 12.21%. The efficiency was higher than that of a Pt-based device (9.96%) fabricated under the same conditions. Hence, Chi@RGO-CIS can be potentially used as the CE of dye-sensitized solar cells (DSSCs). It can be used as a substitute for Pt in DSSCs.
Some of the metrics are blocked by your
consent settings
Feed Rate Optimization for Five Axis Milling with an Iso-scallop Tool Path
(2022-01-01)
Eranga, Ashan
;
Dissanayaka, Supun
;
Hamontree, Chaowalit
Five-axis milling tool path generation and feed rate optimization are challenging tasks. Our previous attempt provided a solution for an iso-scallop initial path determination using an optimal feeding direction (OFD) method that was efficient and maintained the quality of the machining surface. This paper extended the method with feed rate optimization to improve the machining time. Maximal allowable feed rate concept was used to define the objective function which was depended on A and B axis of the machine. To achieve smooth rotary axes motion, two B-splines were used to represent each axis. Then the non-linear optimization problem was solved using the interior-point algorithm with the constraint on global collision. Finally, the predetermined iso-scallop path was combined with the optimized tool orientation. The orientation optimization strategy was compared with constant lead angle and tool orientation smoothing method. Simulation results showed that our variable feed rate assignment decrease the machining time.
Some of the metrics are blocked by your
consent settings
Message from the general secretary
(2018-08-13)
Hamontree, Chaowalit

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results