http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Intelligent Decision Support Algorithm for Uncertain Inventory Management
Le Ngoc Bao Long,Sam-Sang You,Truong Ngoc Cuong,Hwan-Seong Kim 한국항해항만학회 2023 한국항해항만학회 학술대회논문집 Vol.2023 No.1
This paper discovers a robust managerial strategy for a stochastic inventory of perishable products, where the model experiences changing factors including inner parameters and an external disturbance with unknown form. An analytical solution for the optimization problem can be obtained by applying the Hamilton-Bellman-Jacobi equation, however the policy result cannot completely suppress the oscillation from the external disturbance. Therefore, an intelligent approach named Radial Basis Function Neural Networks is applied to estimate the unknown disturbance and provide a robust controller to manipulate the inventory level more effective. The final results show the outstanding performance of RBFNN controller, where both the estimation error and control error are guaranteed in the predefined limit.
Le Ngoc Cuong,Jong-Taek Oh 대한설비공학회 2016 International Journal of Air-Conditioning and Refr Vol.24 No.1
In this paper, the heat pump system has been developed by CFD simulation and experimental investigation. It studies the thermal behavior of a thermobank and COP on heat pump system and cold storage. The thermobank stores the waste heat of during refrigeration cycles and this energy is used for defrosting process and heating room. It also reduces defrosting time and condensation load so that the temperature regulation in the cold storage is constant. The system is investigated experimentally and CFD simulated under thermobank. The dimension L W H of cold storage is 3 1:6 1:4m, thermobank is 600 300 400 mm. The temperature of ambient on CFD simulation process is 20C. This heat pump system can be used to keep preservation of agricultural products in cold storage warehouse together with °oor panel heating for room in winter. The ejector is used in system with the aim of increasing coe±cient of performance (COP) and decrease in compressor displacement. As the experimental results, its COP is increased about 38.57% when using thermobank and ejector in heat pump system.
Design and Simulation of a Monorail Network for the Inter-terminal Transport
Ngoc Cuong Truong,김환성,김인용,DuyAnh Nguyen,Long Le Ngoc Bao 한국항해항만학회 2020 한국항해항만학회지 Vol.44 No.5
In line with the trend of global transport volume which has increased rapidly over the years, internal transportation in seaports is always conducted with high frequency. Thus, there is always much potential for traffic jams as well as high transportation costs and emissions. Many efforts have been initiated to streamline the inter-terminal container transport (ITT) through the development of automated vehicles and equipment as well as using private transport facilities to overcome these limitations. The purpose of this paper to develop a framework to design, analyze, and validate the efficiency of a new ITT system in a port area based on the monorail network and automatic vehicles. First, the number of shuttles and loaders was determined depending on the transport demand scenario. Next, a simulation model was applied to evaluate the system performance as well as gain more insight into the working process of the ITT system. Finally, by setting goals for the performance indicators, the results showed that the system was highly efficient with 100% of the containers delivered to their destination on time. Besides, a series of other performance tracking was provided to provide insight into the system's capabilities.
Cuong, Hoang Ba,Le, Ngoc Minh,Jeong, Sang-Hun,Lee, Byung-Teak Elsevier 2017 Journal of alloys and compounds Vol.709 No.-
<P><B>Abstract</B></P> <P>It has been suggested in this study that the Mg content, band-gap energy, and structural phase in the sputter deposited ZnMgO films could be tailored in a wide range by simply controlling the growth temperature and sputtering ambient. The Mg content in film and the band-gap energy showed a strong dependence on the growth temperature and sputtering ambient, increasing with the growth temperature or decreasing by an oxygen addition into the plasma ambient. In this work, the wurtzite ZnMgO film with a wide band gap of 4.53 eV and a high Mg content of X<SUB>Mg</SUB> = 0.53 could be realized for the first time by sputtering the Zn<SUB>0.7</SUB>Mg<SUB>0.3</SUB>O alloy targets with Mg contents of 0.3–0.35 below 200 °C and under pure Ar ambient. From the dependence of the structural phase on the growth temperature, the solubility limit of Mg in the wurtzite ZnMgO single phase without phase segregation was estimated to be about 0.53–0.56 and confirmed to reduce with the growth temperature, possibly due to the lower formation Gibbs free energy of MgO than ZnO and the difference in growth condition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Tailoring the composition, band-gap, and structural phase of the sputtered ZnMgO film. </LI> <LI> The high Mg solid solubility of 53 mol.% could be realized in wurtzite ZnMgO single phase. </LI> <LI> The higher band-gap of 4.53 eV could be firstly achieved from the wurtzite ZnMgO phase. </LI> <LI> Solid solubility limit of Mg in wurtzite ZnMgO phase reduced with growth temperature. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>