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Shengjie Zhou,Hongwei Ding,Yifan Zhao,Zhijun Yang,Qianlin Liu 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.1
In the Wireless Sensor Network, a new MAC protocol: one-persistent CSMA protocol with monitoring functions and multichannel mechanism for Wireless Sensor Network based on conflict resolution algorithm is proposed. Protocol from the system throughput, collision rate, better service quality for higher priority and other aspects improve the traditional CSMA system to perfect the controllability of the system, making the system more stable for the big data, better adapted to different business. The average cycle method is used to derive rigorous mathematical expressions of specific relevant parameters. Using MATLAB simulation tool for the accuracy of the agreement is demonstrated.
What Explains China’s GEM Market? Evidence from the Five Factors
Shengjie Su,Yun Joo An,Moon Sub Choi 아시아유럽미래학회 2020 유라시아연구 Vol.17 No.1
본 연구에서는 Fama-French 5요인 모형과 3요인 모형을 이용하여 중국의 GEM (Growth-Enterprise- Market) 시장에 상장된 주식의 자산가격을 분석한다. GEM 시장은 기술 섹터 중소형 주식 위주로 이루 어진 주가지수이다. 본 연구는 Fama-French 5요인의 설명력을 계산하는 방법론으로 1요인 분석, 다중 요인 분석, 그리고 다중 요인 모형 회귀분석을 사용한다. 본 연구의 결과로는 ‘Robust Minus Weak’ 요 인이 GEM에 상장된 주식의 가격을 5요인 중 가장 잘 설명한다는 것이다. 3요인에 비해 5요인에 새로 추가된 요인인 ‘Robust Minus Weak’ 요인은 또한, ‘Size/Book to Market’ 요인의 설명력을 약화시킨다. ‘Size/Book to Market’ 요인의 약한 설명력은 중소형 주식이 대형 주식보다 size에 대한 민감도가 높아서 이기 때문이라고 결론낸다. We investigate the applicability of the Fama-French five-factor model and three-factor model on China’s Growth Enterprise Market (GEM), which is a small-mid capital equity-based proxy in technology industries. We calculate the explanatory powers of the five factors by contrasting them against single-factor tests, multi-factor tests, and multi-factor model regression. We argue that in GEM, the ‘Robust Minus Weak’ factor best predicts stock price, whereas such profitability factor weakens the potential of ‘Size/Book to Market’ factor. The weakness of size factor is due to the high sensitivity of small-size enterprises on size factor.
Shengjie Yao,Lei Sun,Xudong Ma 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.5
This paper presents the deformation behavior and crashworthiness of electric resistance welded mild steel tubes with axial gradient microstructures in quasi-static compression. Three sets of tubes were prepared, and regions of each tube were Induction heated and directly quenched (IH-DQ). The effect of the length to diameter (L/D) ratio, and length of the IH-DQ region on crushing characteristics was investigated, and compared with untreated tubes. The compression tests revealed that improved energy absorption can be obtained in IHDQ tubes if the collapse is controlled by the formation of a concertina buckling mode. However, there was a tendency to produce mixed or Euler buckling modes as the ratio of L/D increased. Meanwhile, the results of the crush experiments and the FEM models showed that the heat-treatment process should be precisely controlled to produce the correct type of microstructure, and circumferential uniformity of microstructure distribution.
Study on age-related changes of knee flexor muscle strength in middle-aged and elderly people
Shengjie Liu,Chengfei Zhang,Lu Zhang 아시아건강운동학회 2019 Journal of Asian Society for Health & Exercise Vol.1 No.1
PURPOSE: To investigate the age-related changes of knee flexor muscle strength in middle-aged and elderly people aged 45-64 years in China; to study the effects of different physical exercise habits on the age-related changes of knee flexor muscle strength in middle-aged and elderly people. METHODS: The knee flexor muscle strength test was performed on the middle-aged and elderly people aged 45-64 by using the intelligent isometric muscle strength test system. The statistical analysis software spss21.0 was used for descriptive statistical analysis of the test data, age-related trend analysis, independent sample T-test analysis, analysis of variance and multiple comparisons were performed. Finally, regression analysis was used to analyze the influencing factors of age-related trends. RESULTS: It can be seen from Table 2 that there is a gender difference in the maximum muscle strength of the right and left lateral knee flexors, but the difference is not obvious. Among them, the average age of male middle-aged and older people is above 180N, and the females are all below 150N. The muscle strength of male middle-aged and older people is generally larger than that of female middle-aged and elderly. CONCLUSIONS: (1) there was gender difference in the maximum muscle strength of knee flexor in middle-aged and elderly people, but there was no difference between left and right (p<0.01). The gender difference shows that the mean muscle strength of the male is greater than that of the female, and the mean muscle strength of the male in each age group is about 1.5-2 times of that of the female corresponding age group, but the range of variation of the female muscle strength is more stable than that of the male (p<0.01). (2) The maximal muscle strength of the knee flexor of the male and female middle-aged groups showed a gradual decline in the overall age (p<0.01). And before the age of 60-64, the aging decline of female muscle strength is faster than that of male. Moreover, women showed a small upward trend in the 60-64 age group, but this phenomenon did not occur in male middle-aged people (p<0.01).
SENSITIVITY ANALYSIS FOR A CLASS OF IMPLICIT MULTIFUNCTIONS WITH APPLICATIONS
Shengjie Li,Minghua Li 대한수학회 2012 대한수학회보 Vol.49 No.2
In this paper, under some suitable conditions and in virtue of a selection which depends on a vector-valued function and a feasible set map, the sensitivity analysis of a class of implicit multifunctions is investigated. Moreover, by using the results established, the solution sets of parametric vector optimization problems are studied. In this paper, under some suitable conditions and in virtue of a selection which depends on a vector-valued function and a feasible set map, the sensitivity analysis of a class of implicit multifunctions is investigated. Moreover, by using the results established, the solution sets of parametric vector optimization problems are studied.
A Practical Approach to Indoor Path Loss Modeling Based on Deep Learning
Shengjie Ma,Hong Cheng,Hyukjoon Lee 한국정보과학회 2021 Journal of Computing Science and Engineering Vol.15 No.2
Deep learning has become one of the most powerful prediction approaches, and it can be used to solve classification and regression problems. We present a novel deep learning-based indoor Wi-Fi path loss modeling approach. Specifically, we propose a local area multi-line scanning algorithm that generates input images based on measurement locations and a floor plan. As the input images contain information regarding the propagation environment between the fixed access points (APs) and measurement locations, a convolutional neural network (CNN) model can be trained to learn the features of the indoor environment and approximate the underlying functions of the Wi-Fi signal propagation. The proposed deep learning-based indoor path loss model can achieve superior performance over 3D ray-tracing methods. The average root mean square error (RMSE) between the predicted and measured received signal strength values in the two scenarios is 4.63 dB.
The Impact of Aircraft Cabin Environment on Passenger Boarding Efficiency and Robustness
Shengjie Qiang,Qingxia Huang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.3
The foldable and the side-slip seats are designed to facilitate the aircraft boarding process by providing wider spaces. Yet, these futuristic concepts have not been investigated exhaustively concerning boarding time performance and the sensitivity of various factors. Thus, we test the effectiveness of such two new concept seats by using a cellular automaton (CA) based aircraft boarding model. Simulation results confirm the potentials of improving efficiency by using the two innovative seats, and of which the foldable seat prevails over the side-slip seat in boarding time. About 12.7% and 30% time reduction could be achieved for the side-slip seat and the foldable seat by taking the conventional seat performance as a baseline, and this value could be further increased by using some other refined boarding strategies. Moreover, the foldable seat exhibits much robustness to the variation of the boarding conditions than the side-slip seat and thus could provide a much reliable boarding environment.