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RISS 인기검색어
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- 저자 : ( Changzhen Li ) (검색결과 5 건)
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Ran Chu,Penglin Liu,Jingying Chen,Xiaodong Cheng,Kezhen Li,Yanci Che,Jianliu Wang,Li Li,Xi Zhang,Shu Yao,Li Song,Ying Zhao,Changzhen Huang,Ying Xue,Xiyu Pan,Junting Li,Zhongshao Chen,Jie Jiang,Beihua 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.2
Objective: To evaluate the impact of bleomycin/etoposide/cisplatin (BEP) and paclitaxel/carboplatin (PC) chemotherapy regimens on the fertility and prognostic outcomes in malignant ovarian germ cell tumor (MOGCT) patients who underwent fertility-sparing surgery (FSS). Methods: A propensity score matching algorithm was performed between the BEP and PC groups. The χ2 test and the Kaplan-Meier method were used to compare the fertility outcome, disease-free survival (DFS) and overall survival (OS). The Cox proportional hazards regression analysis was used to identify risk factor of DFS. Results: We included 213 patients, 185 (86.9%) underwent BEP chemotherapy, and 28 (13.1%) underwent PC chemotherapy. The median age was 22 years (range, 8–44 years), and the median follow-up period was 63 months (range, 2–191 months). Fifty-one (29.3%) patients had a pregnancy plan, and 35 (85.4%) delivered successfully. In the before and after propensity score matching cohorts, there were no significant differences in spontaneous abortion, selective termination of pregnancy, during-pregnancy status, and live birth between the BEP and PC groups (p>0.05). Fourteen (6.6%) patients experienced recurrence, including 11 (5.9%) in the BEP group and 3 (10.7%) in the PC group. Four (1.9%) patients in the BEP group died. Kaplan-Meier analysis revealed no significant differences in DFS (p=0.328) and OS (p=0.446) between the BEP and PC groups, and the same survival results were observed in the after matching cohort. Conclusion: The PC regimen is as safe as the BEP regimen for MOGCT patients with fertility preservation treatment, and no differences were observed in fertility and clinical prognosis.
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Revealed Comparative Economies of Scope and Development Index
Shuhe Li,Changzhen Gong 서울대학교 경제연구소 1995 Seoul journal of economics Vol.8 No.3
In this note, we attempt to construct some summary statistic to measure economic development and make comparisons across countries. A development index is defined in terms of both "scale" and "scope". "Scale" is measured by output per capita. "Scope" is measured by revealed comparative economies of scope, which in turn is measured by the ratio of the variety of exports over the variety of imports for a country. Using purchasing power parity and the Standard International Trade Classification, we have computed the development index for forty countries.
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( Jing Zhang ),( Changzhen Li ),( Luyao Du ),( Wei Chen ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.8
A considerable literature has recently grown up on the theme of ship wireless communications. However, much of the research up to now has been descriptive in the offshore area. There has been little quantitative analysis of wireless communication in inland waterways, which has received considerable attention lately. Until now, only the effects on inland river environment are examined. What is less clear is the nature of channel change caused by the antenna movement. Here we explore the moving ship-to-fixed-ship fading characteristics at 5.9 GHz for an inland waterway in the city center of China. The ship motion trajectory is designed in order to determine the effect of changes in the antenna position. We evaluate the channel fading characteristics of inland waterway, which are highly correlated with the distance between transmitter and receiver. We demonstrate that the line-of-sight component, as well as the components from multipath with obstruction reflections, contributes largely to the mean power gap. Our findings reveal critical ship-to-ship characteristics in inland waterway, which definitely contribute to the field of ship wireless communications.
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Shellix : An Efficient Approach for Shellcode Detection
Mo Chen,Changzhen Hu,Donghai Tian,Xin Wang,Yuan Liu,Ning Li 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.6
Code injection attacks are widely used by attackers to compromise computer systems. Attackers could obtain the control of a victim's computer system by injecting shellcode to the vulnerable program. The existing solutions to detect shellcode can be grouped into two categories: static analysis and dynamic analysis. Static analysis can detect shellcode efficiently, but cannot handle the shellcode that employs obfuscation techniques. Dynamic analysis is able to detect the obfuscated shellcode, however it is still limited to detect the recent virtualization-aware shellcode. In this paper, we present a novel shellcode detection approach without using any virtualization technology. We implement our approach based on the commodity OS kernel which is compatible to the existing system. Our approach is able to detect the shellcode that could be aware of the virtualization environment and reduces the probability of exposing detection environment. Our experimental evaluations show that our system can effectively detect a large set of shellcode instances with good performance.
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Zixu Su,Wei Chen,Changzhen Li,Junyi Yu,Guojiao Gong,Zixin Wang 한국전자통신연구원 2023 ETRI Journal Vol.45 No.5
The application of unmanned aerial vehicles (UAVs) has recently attracted considerable interest in various areas. A three-dimensional multiple-input multiple-output concentric two-hemisphere model is proposed to characterize the scattering environment around a vehicle in an urban UAV-to-vehicle communication scenario. Multipath components of the model consisted of lineof-sight and single-bounced components. This study focused on the key parameters that determine the scatterer distribution. A time-variant process was used to analyze the nonstationarity of the proposed model. Vital statistical properties, such as the space–time–frequency correlation function, Doppler power spectral density, level-crossing rate, average fade duration, and channel capacity, were derived and analyzed. The results indicated that with an increase in the maximum scatter radius, the time correlation and levelcrossing rate decreased, the frequency correlation function had a faster downward trend, and average fade duration increased. In addition, with the increase of concentration parameter, the time correlation, space correlation, and levelcrossing rate increased, average fade duration decreased, and Doppler power spectral density became flatter. The proposed model was compared with current geometry-based stochastic models (GBSMs) and showed good consistency. In addition, we verified the nonstationarity in the temporal and spatial domains of the proposed model. These conclusions can be used as references in the design of more reasonable communication systems.
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