http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Yu Shi 한국행정학회 2018 International Review of Public Administration Vol.23 No.1
This research investigates how characteristics of the macro-level governing structure affect local public sector employment. The empirical model is tested using fixed effects with panel data that consist of 3031 county-type areas in the United States for five year intervals from 1992 to 2012. We find that an increased level of fiscal decentralization is associated with larger labor input in the production of public services. Our statistical results also show that interjurisdictional competition leads to the growth of local public sector employment. Nevertheless, we do not find that spatial fragmentation and jurisdictional overlap have any significant relationship with the level of public sector employment.
Low Velocity Impact Behavior of Aluminum Honeycomb Structures
Yu Shi,Yi-Qi Wang,Ali Md. Afsar,Jung-Il Song,Intaek Lee,Yasuo Ochi 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Impact behavior of Aluminum Honeycomb Composites (AHC) under the impact loading is checked by using an explicit definition of dynamic ductile failure. Applicable testing followed by drop weight test is also investigated in this study. The specimens with 1/2inches cell size are tested by two impactors with the weight of 5.25Kgf and 11.9Kgf respectively. Dynamic nonlinear transient analysis using finite element method is accomplished for nonlinear contact and elastoplastic behavior described in FE model of AHC. Impact behavior of AHC along with different contact points appeared nearly the same in low impact energy, but it was different in high impact energy. At the centered contact point of honeycomb core cell, resistance peak force shows the highest and at the contact on short-edge of the core cell, its resistance shows the lowest. Comparing fracture mode and time history of resistance force with test, real time deformation from FE results gives the fracture process when the crack initiated and propagated to go further penetration from faced sheet to the honeycomb core.
Durability Test And Crash Analysis Of Automobile Power Seat
Yu Shi,Yi-Qi Wang,Ali Md. Afsar,Jung-Il Song 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
'Turny type power seat' was developed to have disabled person get on and off a vehicle without troubles. At the same time, it is imperative to ensure the safety and stability of the power seat which necessitates various tests and analysis. In this study, the durability test and crash analysis were performed for the power seat. The durability test was performed by applying a load of 100㎏ to simulate the weight of passenger. Crash analysis was carried out by using the LS-DYNA program. The durability lest ensured a longer life cycle of the power seat. Further, the results of crash analysis showed that the distorted deformation was so low that it could not bring the danger for passengers. However, the forward displacement of the seat was much more to cause a large deformation of the hook plate, which was dangerous for passengers. Therefore, further modifications of the power seat should be made to ensure better performance, especially to reduce the forward displacement when the crash happens.
Side Information-free Low Computational Complexity TDSS-SLM Transmission System
Yushi Shirato,Masahiro Muraguchi 한국통신학회 2021 ICT Express Vol.7 No.4
The authors propose the side information-free low-computational complexity Time Domain Sequence Superposition - Selected Mapping (TDSS-SLM) scheme for PAPR suppression. We adopt IFFT point reduction for transmitter and reception technique using pilot subcarriers for side information estimation. The simulation results show the [R1-1]TDSS-SLM transmitter achieves PAPR reduction of 2.3 dB which corresponds to the 1.5 times larger PAE than that in the conventional transmitter. In addition, the proposed receiver shows loss-less BER performances for both AWGN channel and two types of fading channels, while the computational complexity of the proposed receiver is nearly the same as the conventional OFDM receiver, which is less than 1/10 of the ML receiver.
Yushi Song,Hao Wu,Guoxin Li 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
This study constructs a model to predict ad attitude when AI influencers act as ad endorsers. In the results, search products and rational ad appeal have more positive ad attitude, perceived empathy and perceived expertise as mediator. These three variables can be reinforced by the consistency of ad appeals and product categories.