Journal of Advanced Marine Engineering and Technology最新文献

{"title":"Recrystallization kinetics and the mechanical properties of low-carbon steel during high-temperature annealing in electric furnace","authors":"Sanjaya Kumar Pradhan, Min-Suk Oh","doi":"10.5916/jamet.2024.48.1.9","DOIUrl":"https://doi.org/10.5916/jamet.2024.48.1.9","url":null,"abstract":"","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"3 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140410824","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}

{"title":"Experimental investigation of the entrainment and pressure lifting characteristics of two-phase ejectors","authors":"S. Park, Hei-Cheon Yang","doi":"10.5916/jamet.2024.48.1.14","DOIUrl":"https://doi.org/10.5916/jamet.2024.48.1.14","url":null,"abstract":"","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"30 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140411736","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}

{"title":"Exhaust Gas Recirculation (EGR) effect on two-stroke diesel engines under sailing condition","authors":"Min-A Je, Suk-Ho Jung, Tae-young Jeong, Sung-chul Hwang, Jae-Sung Moon","doi":"10.5916/jamet.2024.48.1.1","DOIUrl":"https://doi.org/10.5916/jamet.2024.48.1.1","url":null,"abstract":"","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"29 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140410712","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}

{"title":"Discrete stochastic EOQ model for deteriorating inventory in supply chain using Hamilton-Jacobi-Bellman equation","authors":"Le Ngoc Bao Long, S. You, H. Kim","doi":"10.5916/jamet.2024.48.1.24","DOIUrl":"https://doi.org/10.5916/jamet.2024.48.1.24","url":null,"abstract":": In an ideal environment, an optimal replenishment point is required for the best output performance with maximized profit for a classical economic order quantity (EOQ) model. However, in practice, most supply chains experience variations that affect the theoretical results. Most products are perishable, which implies that their quality deteriorates over time. This issue must be resolved promptly before the cycle ends because unsold items result in revenue loss. This study presents an EOQ model in a discrete domain with uncertainties in the systematic parameters. The demand for products depends linearly on the pricing scheme of the enterprise, which must be analyzed optimally to achieve the maximum profit in the replenishment cycle. To solve this optimization problem, an optimal control technique named the Hamilton–Jacobi–Bellman (HJB) equation is introduced, which has been proven successful in solving similar issues. The convergence constraints of the HJB equation and the optimal reordering quantity are analyzed. The performance of the proposed approach is revealed via simulations, in which the behavior of the inventory system in perfect and imperfect scenes is demonstrated. The final result indicates that the optimal solution is admissible and robust as it remains valid in varying environments, with a difference of less than 5% in the ideal case.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140410743","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}

{"title":"Precise solving procedure of modal eigenvalues at a subwavelength metal-insulator-metal slit at terahertz frequencies","authors":"Jong-Eon Park","doi":"10.5916/jamet.2024.48.1.32","DOIUrl":"https://doi.org/10.5916/jamet.2024.48.1.32","url":null,"abstract":"","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"7 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140412110","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}

{"title":"A Study on hydrogen dispersion characteristics according to the length of the exhaust duct in the fuel gas supply system room","authors":"Jeong Hwan Kim, Soung Woo Park, Hee Jin Kim, Jung Kwan Seo","doi":"10.5916/jamet.2024.48.1.37","DOIUrl":"https://doi.org/10.5916/jamet.2024.48.1.37","url":null,"abstract":"","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"3 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140409972","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}

{"title":"Legal considerations for implementing Extended Reality (XR) technology in the shipbuilding industry: Perspectives on devices and software","authors":"DongHyup Youn, JaeWook Jang","doi":"10.5916/jamet.2023.47.5.267","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.267","url":null,"abstract":": This study explores the implementation of Extended Reality (XR) technology, which encompasses virtual, augmented, and mixed reality elements, in the shipbuilding industry to provide immersive and interactive experiences. The XR technology has shown great potential in the shipbuilding industry, offering benefits such as design visualization, virtual prototyping, and training simulations. This study analyzes the legal issues surrounding using XR technology in the industry from both device and software perspectives. It examines the implications of the relevant laws, identifies legal challenges, and proposes areas for further research, including intellectual property rights, software distribution, user management, and policy development.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139307286","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}

{"title":"Development and empirical study on integrated ventilation–cleaning filter system for removal of harmful substances flowing into ship cabins","authors":"Hae-Yeon Ko, Jeong-Hyeon Lee, Seo-An Lee, Jung-Koo Kang, Sang-Deuk Lee","doi":"10.5916/jamet.2023.47.5.261","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.261","url":null,"abstract":": Marine environment protection and the improvement of the internal environment of ships are emerging as necessary tasks in modern ship operations. In particular, soot and ash, which are harmful substances generated during fuel combustion in diesel engines, enter the interior of a ship, which degrades air quality inside the ship and adversely affects the health of crew members. Because ships are highly confidential compared to general buildings and it is difficult to achieve natural ventilation between the exterior and interior of a ship, various indoor air pollutants can spread rapidly into a ship if adequate ventilation or removal systems are lacking, thereby posing a risk to the respiratory health of passengers and crew members. In this study, a combined ventilation–cleaning filter system was developed to effectively filter out harmful substances and improve the air quality inside the cabin. DB, PM10, and PM2.5, which are harmful particulate substances, and total volatile organic compounds, which are harmful gaseous substances, were measured inside the cabin of a ship to determine its indoor air quality. The measurement results for the fine-particle size concentration showed that PM2.5 and PM10 exhibited a similar increasing and decreasing trend, with pollutant concentrations up to six times higher during departure than at anchoring. The values were higher than the daily limit recommended by the World Health Organization (PM2.5: 25 μg/m 3 ; PM10: 50 μg/m 3 ). Based on the concentrations of volatile organic compounds, the concentration at ship departure showed a similar trend to that of fine particles in the cabin (1659 ppb), which was approximately five times higher than the daily average (333 ppb) recommended by AWAIR. A filter system for ship environments was designed using a simulation tool to address this problem. The filter system consisted of a filter for removing particulate pollutants. By optimizing the system, the pollutants generated from ships and the performance degradation of the existing air-conditioning system were minimized. In addition, we analyzed the current status of gas pollutants inside ships to examine the use of activated carbon attachment filters in removing gaseous pollutants. After filter installation, the fine-particle concentration decreased to a maximum of 25.67 μg/m 3 (PM10), indicating a reduction by 2.6 times, and the average air quality increased to 9.7 μg/m 3 (PM10). A system that can remove particulate pollutants and gaseous pollutants simultaneously should be investigated in future studies.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139309071","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}

{"title":"Improved sliding mode observer for FOC control system with discontinuous PWM of sensorless PMSM","authors":"VU Van Hung, Kyoung-kuk Yoon, Sung-geun Lee","doi":"10.5916/jamet.2023.47.5.244","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.244","url":null,"abstract":": With the increasing number of electric cars worldwide, permanent-magnet synchronous motors (PMSMs) are becoming increasingly popular in the transportation industry. In parallel with the development of PMSM, many novel control strategies have been developed to make PMSM superior and robust. In all control strategies aimed at improving the operation of PMSMs, the control strategy using discontinuous pulse width modulation (DPWM) instead of continuous space vector pulse width modulation (CSVPWM) for field-oriented control (FOC) is widely used to reduce switching and save energy. However, this method has not been applied by researchers to sensorless PMSM control three-phase inverters. Therefore, this study investigated a sensorless PMSM control with a DPWM FOC and a traditional sliding-mode observer to estimate rotor positions. Additionally, a modified sliding-mode observer with a Park phase-locked loop (PLL) was designed experimentally to improve the stability of the PMSM speed and reduce harmonics in the output phase current for the inverter under the FOC with DPWM. The experimental results verified that the sliding-mode observer integrated with the Park PLL can improve the operation of the sensorless PMSMs under FOC with DPWM.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139306781","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}

{"title":"A study to develop a linear quadratic controller for a ship central cooling system","authors":"Tae-Youl Jeon","doi":"10.5916/jamet.2023.47.5.238","DOIUrl":"https://doi.org/10.5916/jamet.2023.47.5.238","url":null,"abstract":": In this study, a linear quadratic (LQ) controller was developed and applied to maintain the desired freshwater outlet temperature, efficiently operate the seawater (SW) pump rotational speed, and effectively regulate the three-way valve opening in response to step disturbances. A mathematical model of the central cooling system was established to integrate the two controllers. The state-space equation of the mathematical model was linearized to facilitate controller development. The voltage frequency of the SW pump motor and three-way valve opening degree were selected as the two primary inputs of the system control. In contrast, the heat exchanger (HEX) and three-way valve outlet temperatures were the primary outputs of the control system. To design the LQ controller, the input control vector that minimized the performance index by incorporating specific weighting matrices was determined. The resulting LQ controller with an integrator was developed and tested through control performance simulations. The simulation results revealed that the proposed controller controlled the freshwater outlet temperature with minimal overshoot, efficiently controlled the SW pump rotational speed, and effectively controlled the three-way valve opening against step disturbances. The proposed LQ controller for central cooling systems offers a refined approach for efficiently controlling ship central cooling systems.","PeriodicalId":217894,"journal":{"name":"Journal of Advanced Marine Engineering and Technology","volume":"65 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139308100","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}