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Long, Luong Duc,Nan, Wansoo The Korean Institute of Electrical Engineers 2013 The Journal of International Council on Electrical Vol.3 No.3
This paper presents an algorithm to characterize scattering parameters of multi-port device with a four-port Vector Network Analyzer (VNA). By employing the renormalization of scattering matrices with different reference impedances at ports, data obtained from multi-port configuration measurements can be synthesized to build the full scattering matrix of the device-under-test (DUT). Although that procedure can be best used for the interconnect system in which the inside routing is quite apparent, we still need an appropriate algorithm to select specific S-parameters for the black-box model where the configuration inside is not known. This paper presents an algorithm to determine which S-parameters are suitable to be selected to reconstruct the full S-matrix of the system. Using the selected specific S-parameters, the renormalization of the scattering matrices could be synthesized to successfully estimate the S-parameters of a multiport interconnect system. A good agreement between the estimated and true S-parameters verifies the validness of the algorithm.
Duc-Hoc Tran,Long Luong-Duc,Minh-Tin Duong,Trong-Nhan Le,Anh-Duc Pham 한국CDE학회 2018 Journal of computational design and engineering Vol.5 No.2
Construction managers often face with projects containing multiple units wherein activities repeat from unit to unit. Therefore effective resource management is crucial in terms of project duration, cost and quality. Accordingly, researchers have developed several models to aid planners in developing practical and near-optimal schedules for repetitive projects. Despite their undeniable benefits, such models lack the ability of pure simultaneous optimization because existing methodologies optimize the schedule with respect to a single factor, to achieve minimum duration, total cost, resource work breaks or various combinations, respectively. This study introduces a novel approach called ‘‘opposition multiple objective symbiotic organisms search” (OMOSOS) for scheduling repetitive projects. The proposed algorithm used an opposition-based learning technique for population initialization and for generation jumping. Further, this study integrated a scheduling module (M1) to determine all project objectives including time, cost, quality and interruption. The proposed algorithm was implemented on two application examples in order to demonstrate its capabilities in optimizing the scheduling of repetitive construction projects. The results indicate that the OMOSOS approach is a powerful optimization technique and can assist project managers in selecting appropriate plan for project.
Eudesmols Induce Apoptosis through Release of Cytochrome c in HL-60 Cells
Duc Manh Hoang,Trinh Nam Trung,Long He,Do Thi Ha,이명숙,김보연,Hoang Van Luong,안종석,배기환 한국생약학회 2010 Natural Product Sciences Vol.16 No.2
We verified that the apoptosis activities were examined by DNA fragmentation, flow cytometric analysis with annexin V staining, activation of caspase-3, and cytochrome c release. In the result, a- and b-eudesmol induced DNA fragmentation in HL-60 cells at a concentration of 80 mM, respectively. Additionally, pro-apoptotic cells sorted by flow cytometry analysis were detected in HL-60 cells to 31.77 and 29.67% with a- and b-eudesmol of 80 mM. Thus, both a- and b-eudesmol exerted caspase-3 activation and cytochrome c release at 80 mM in HL-60 cells. These results are firstly reported that the sesquiterpenes, a- and b-eudesmol are apoptosis inducers through mitochondria-dependent caspase cascade in HL-60 cells.
Measurement of Multi-Port S-Parameters using Four-Port Network Analyzer
Jongmin Kim,Duc Long Luong,Wansoo Nah,SoYoung Kim 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.6
An efficient measurement methodology is proposed to construct the scattering parameters of a multi-port device using a four-port vector network analyzer (VNA) without the external un-terminated ports. By using the four-port VNA, the reflected waves from the un-terminated ports could be minimized. The proposed method significantly enhances the accuracy of the S-parameters with less number of measurements compared to the results of classical renormalization technique which uses twoport VNA. The proposed method is validated from the measured data with the coupled 8-port micro-strip lines.
Measurement of Multi-Port S-Parameters using Four-Port Network Analyzer
Kim, Jongmin,Luong, Duc Long,Nah, Wansoo,Kim, SoYoung The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.6
An efficient measurement methodology is proposed to construct the scattering parameters of a multi-port device using a four-port vector network analyzer (VNA) without the external un-terminated ports. By using the four-port VNA, the reflected waves from the un-terminated ports could be minimized. The proposed method significantly enhances the accuracy of the S-parameters with less number of measurements compared to the results of classical renormalization technique which uses two-port VNA. The proposed method is validated from the measured data with the coupled 8-port micro-strip lines.