Simulation Design of Economic Processes

2011 ◽  
Vol 7 (1) ◽  
pp. 16-25
Author(s):  
O.Ye. Kuz'min ◽  
◽  
V.V. Kozik ◽  
Yu.I. Sidorov ◽  
V.E. Yerashok ◽  
...  
Keyword(s):  
Simulation Design

Forced Zero Cross-Loading Misspecifications in Measurement Component of Structural Equation Models

Methodology ◽  
2014 ◽  
Vol 10 (4) ◽  
pp. 138-152 ◽  
Author(s):  
Hsien-Yuan Hsu ◽  
Susan Troncoso Skidmore ◽  
Yan Li ◽  
Bruce Thompson
Keyword(s):  
Structural Equation ◽  
Structural Model ◽  
Structural Equation Models ◽  
Equation Model ◽  
Model Fit ◽  
Model Specification ◽  
Simulation Design ◽  
Measurement Models ◽  
Fit Statistics ◽  
Path Coefficients

The purpose of the present paper was to evaluate the effect of constraining near-zero parameter cross-loadings to zero in the measurement component of a structural equation model. A Monte Carlo 3 × 5 × 2 simulation design was conducted (i.e., sample sizes of 200, 600, and 1,000; parameter cross-loadings of 0.07, 0.10, 0.13, 0.16, and 0.19 misspecified to be zero; and parameter path coefficients in the structural model of either 0.50 or 0.70). Results indicated that factor pattern coefficients and factor covariances were overestimated in measurement models when near-zero parameter cross-loadings constrained to zero were higher than 0.13 in the population. Moreover, the path coefficients between factors were misestimated when the near-zero parameter cross-loadings constrained to zero were noteworthy. Our results add to the literature detailing the importance of testing individual model specification decisions, and not simply evaluating omnibus model fit statistics.

Konsep Kapal Pengumpan Reguler untuk Mendukung Angkutan Laut Perintis di Wilayah Pulau-Pulau Terpencil

2019 ◽  
Vol 4 (1) ◽  
pp. 12
Author(s):  
Dany Hendrik Priatno ◽  
Samudro
Keyword(s):  
Simulation Design ◽  
Feeder Vessel

Keterbatasan sarana dan prasarana transportasi di wilayah pulau-pulau terpencil masih menjadi kendala dalam mengembangkan sektor transportasi di wilayah tersebut. Di sisi lain, wilayah ini diharapkan dapat menjadi faktor pemicu dalam peningkatan perekonomian, membuka keterisolasian, dan menjaga stabilitas dan keamanan wilayah. Pola penerapan jaringan transportasi angkutan laut dengan sistem subsidi (angkutan laut perintis) dari pemerintah sudah berjalan meski dengan berbagai kendala yang memerlukan pemikiran dan solusi tepat dalam mendukung program transportasi angkutan laut bersubsidi tersebut dalam hal efektifitas angkutan, efisiensi dan pemerataan dalam pemanfaatannya. Keterbatasan pelayanan pada rute operasional angkutan laut perintis dapat dijembatani dengan menerapkan konsep pengumpan (feeder) regular pada titik – titik singgah kapal perintis, sehingga dengan demikian rute eksisting angkutan laut perintis dapat tetap dioptimalkan, tanpa menambah jumlah titik singgah (yang berarti menambah time voyage), bahkan hal ini dapat mengurangi jumlah titik singgah kapal perintis laut. Simulasi penerapan konsep feeder pada jalur angkutan laut perintis dilakukan dan dilengkapi dengan kajian kebutuhan desain sarana kapal feeder perintis yang tepat untuk mendukung konsep sistem feeder tersebut.Keywords : feeders pioneer, operational simulation, design feeder vessel

scholarly journals High-Performance Ultra-Thin Spectrometer Optical Design Based on Coddington’s Equations

Sensors ◽  
2021 ◽  
Vol 21 (2) ◽  
pp. 323
Author(s):  
Zhiwei Feng ◽  
Guo Xia ◽  
Rongsheng Lu ◽  
Xiaobo Cai ◽  
Hao Cui ◽  
...  
Keyword(s):  
High Resolution ◽  
Spectral Resolution ◽  
High Performance ◽  
Optical Design ◽  
Pixel Size ◽  
Simulation Design ◽  
Central Wavelength ◽  
Spot Radius ◽  
Unique Method ◽  
Almost All

A unique method to design a high-throughput and high-resolution ultrathin Czerny–Turner (UTCT) spectrometer is proposed. This paper reveals an infrequent design process of spectrometers based on Coddington’s equations, which will lead us to develop a high-performance spectrometer from scratch. The spectrometer is composed of cylindrical elements except a planar grating. In the simulation design, spot radius is sub-pixel size, which means that almost all of the energy is collected by the detector. The spectral resolution is 0.4 nm at central wavelength and 0.75 nm at edge wavelength when the width of slit is chosen to be 25 μm and the groove density is 900 lines/mm.

scholarly journals The Simulation Design of Microwave Absorption Performance for the Multi-Layered Carbon-Based Nanocomposites Using Intelligent Optimization Algorithm

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1951
Author(s):  
Danfeng Zhang ◽  
Congai Han ◽  
Haiyan Zhang ◽  
Bi Zeng ◽  
Yun Zheng ◽  
...  
Keyword(s):  
Layer Structure ◽  
Optimal Solution ◽  
Single Layer ◽  
Simulation Design ◽  
Wide Bandwidth ◽  
Abc Algorithm ◽  
Bee Colony ◽  
Absorbing Material ◽  
Important Means ◽  
Carbon Based

The optimal design objectives of the microwave absorbing (MA) materials are high absorption, wide bandwidth, light weight and thin thickness. However, it is difficult for single-layer MA materials to meet all of these requirements. Constructing multi-layer structure absorbing coating is an important means to improve performance of MA materials. The carbon-based nanocomposites are excellent MA materials. In this paper, genetic algorithm (GA) and artificial bee colony algorithm (ABC) are used to optimize the design of multi-layer materials. We selected ten kinds of materials to construct the multi-layer absorbing material and optimize the performance. Two algorithms were applied to optimize the two-layer MA material with a total thickness of 3 mm, and it was found that the optimal bandwidth was 8.12 GHz and reflectivity was −53.4 dB. When three layers of MA material with the same thickness are optimized, the ultra-wide bandwidth was 10.6 GHz and ultra-high reflectivity was −84.86 dB. The bandwidth and reflectivity of the optimized material are better than the single-layer material without optimization. Comparing the GA and the ABC algorithm, the ABC algorithm can obtain the optimal solution in the shortest time and highest efficiency. At present, no such results have been reported.

Simulation Design of TWT Based on CNT Cold Cathode

2020 ◽  
Author(s):  
Yanan Liu ◽  
Xiaotao Xu ◽  
Xuesong Yuan ◽  
Rui Wang ◽  
Hailong Li ◽  
...  
Keyword(s):  
Cold Cathode ◽  
Simulation Design
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