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- 저자 : Xun-Lin Zhu (검색결과 4 건)
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LMI Stability Criterion with Less Variables for Time-delay Systems
Xun-Lin Zhu,Tao Li,Chong Lin,Lei Guo,Guang-Hong Yang 제어·로봇·시스템학회 2009 International Journal of Control, Automation, and Vol.7 No.4
Slack variables approach is an important technique for tackling the delay-dependent stability problem for systems with time-varying delay. In this paper, a new delay-dependent stability criterion is presented without introducing any slack variable. The technique is based on a simply integral inequal-ity. The result is shown to be equivalent to some existing ones but includes the least number of vari-ables. Thus, redundant selection and computation can be avoided so that the computational burden can be largely reduced. Numerical examples are given to illustrate the effectiveness of the proposed stabil-ity conditions.
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Guang-Xun Lin,Li-Ru He,Jin-Niang Nan,Wen-Bin Xu,Keyi Xiao,Zhiqiang Que,Shang-Wun Jhang,Chien-Min Chen,Ming-Tao Zhu,Gang Rui 대한척추신경외과학회 2024 Neurospine Vol.21 No.1
Objective: This meta-analysis aims to refine the understanding of the optimal choice between different cage shapes in transforaminal lumbar interbody fusion (TLIF) by systematically comparing perioperative data, radiological outcomes, clinical results, and complications associated with banana-shaped and straight bullet cages. Methods: A meticulous literature search encompassing PubMed, Embase, Scopus, Web of Science, China Knowledge Network, and Wanfang Data was executed up to October 5, 2023. Inclusion criteria focused on studies comparing banana-shaped and straight bullet cages in TLIF. The quality of included studies was assessed using appropriate tools such as the Newcastle-Ottawa Scale (NOS) for nonrandomized studies. Rigorous evaluations were performed for radiographic outcomes, including disc height (DH), segmental lordosis (SL), lumbar lordosis (LL), subsidence, and fusion rates. Clinical outcomes were meticulously evaluated using visual analogue scale (VAS), Oswestry Disability Index (ODI), and complications. Results: The analysis incorporated 7 studies, involving 573 patients (297 with banana-shaped cages, 276 with straight cages), all with NOS ratings exceeding 5 stars. No statistically significant differences were observed in operative time, blood loss, or hospitalization between the 2 cage shapes. Banana-shaped cages exhibited greater changes in DH (p = 0.001), SL (p = 0.02), and LL (p = 0.01). Despite statistically higher changes in ODI for straight cages (26.33, p < 0.0001), the actual value remained similar to banana-shaped cages (26.15). Both cage types demonstrated similar efficacy in VAS, complication rates, subsidence, and fusion rates. Conclusion: Although banana-shaped cages can excel in restoring DH, SL, and LL, straight bullet cages can provide comparable functional improvements, pain relief, and complication rates.
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Wu, Hong-Xun,Zhang, Bing-Jie,Wang, Jun,Zhu, Bei-Lin,Zang, Ya-Ping,Cao, Yue-Long Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.2
Background: To evaluate the diagnostic utility of conventional ultrasonography and real time ultrasound elastography in differentiating degenerating cystic thyroid nodules mimicking malignancy from papillary thyroid carcinoma. Methods: We retrospectively analyzed conventional ultrasonographic and elastographic characteristics of 19 degenerating cystic thyroid nodules mimicking malignancy in 19 patients, with 30 surgically confirmed PTCs as controls. Based on size, the nodules had been grouped into less than 10mm (group A) and greater than 10 mm (group B). We evaluated conventional parameters and elasticity pattern. Color-scaled elastograms were graded as to stiffness of nodules using an elasticity pattern from I (soft) to IV (stiff). Results: Degenerating cystic thyroid nodules were similar to PTCs in conventional ultrasonographic findings, but the former frequently showed oval to round in shape (group A, 69.2% vs 18.8%, P=0.017; group B, 66.7% vs 7.14%, P=0.017) and punctuate hyperechoic foci (group A, 61.5% vs 0, P<0.001; group B, 50% vs 0, P<0.001). On real time ultrasound elastography, 7 of 13 degenerating cystic thyroid nodules in group A were pattern I, 5 were pattern II, 1 was pattern III. One degenerating cystic thyroid nodule in group B was pattern II, 5 were pattern III. The area under the curve for elastography was 0.98 in group A (sensitivity 92.3%, specificity 100%, P = 0.002), and 0.88 in group B (sensitivity 16.7%, specificity 100%, P = 0.014). Conclusions: As a dependable imaging technique, elastography helps increase the performance in differential diagnosis of degenerating cystic thyroid nodule and malignancy.
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Yu Zhang,Songmin Zhou,Xun Li,Xi Wang,Liqi Zhu,Chun Lin 대한전자공학회 2022 Journal of semiconductor technology and science Vol.22 No.2
Unstable pixels directly affect the imaging quality of the long-wavelength infrared (LWIR) mercury cadmium telluride (HgCdTe, MCT) focal-plane-array (FPA) detector. This study investigates the unstable pixels of LWIR HgCdTe linear arrays with different passivation. According to the different fluctuation characteristics, the unstable pixels are classified into four types: trend-clear type (including the rising and declining pixels), fluctuating type, comb type, and telegraph type. The number of unstable pixels under different bias voltage is counted, which indicates that when the bias voltage is large enough, the number of unstable pixels can increase sharply. By comparing the characteristics of the unstable pixels of two linear arrays with different passivation, we find that the unstable pixels are sensitive to the surface passivation. In addition, the dark currents of unstable pixels and that of normal pixels are compared, inferring that there is no apparent connection between the cause of the instability of the pixels and that of the dark current.
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