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ABSTRACT: In this paper, a circuit model equivalent to that proposed in a previous work was verified through experimental and finite element methods. On the basis of this verified model, the impact of the parameters on the electrical characteristics of a circular flexural vibration mode piezoelectric transformer was systematically investigated through the orthogonal experiment design method. Some interesting and valuable rules were found. Additionally, the research process showed that the orthogonal experimental design method itself can partly act as an optimization design method for the circular flexural vibration mode piezoelectric transformer design.
IEEE transactions on ultrasonics, ferroelectrics, and frequency control 12/2012; 59(12):2731-2741. · 1.80 Impact Factor
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ABSTRACT: This study aimed to determine the overall survival time and clinical characteristics affecting the outcomes in patients with resectable colorectal cancer (CRC).
Clinical data from CRC patients who underwent surgical resections from 1994 to 2004 was analyzed retrospectively using the documented records and gastrointestinal tumor databases at the gastrointestinal institute. Univariate and multivariate analyses were conducted to investigate the association between clinical variables and overall survival time.
A consecutive series of 1.294 CRC patients were enrolled for the final analyses. The five-year survival rates were 94.1%, 80.2%, 61.7% and 23.2% of patients with stage from I to IV CRC, respectively. One hundred and seven patients (8.3%) had disease recurrence during the follow-up with a median of 50.3 months. After radical surgical resections, patients with recurrence could still expect a five-year survival rate of 44.3%. Multivariate analysis showed that patient age >60 years, infiltrative tumor type, intestinal obstruction, poor tumor differentiation, disease recurrence and late TNM stage were associated with poor survival (all p<0.05).
The overall postoperative survival in this series of patients with CRC was mainly affected by patient age, tumor morphology, bowel obstruction, histological grade, TNM stage and disease recurrence. For those patients with recurrence, surgical resection should be recommended primarily if the tumor is resectable.
Hepato-gastroenterology 11/2011; 59(117):1398-402. · 0.66 Impact Factor
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ABSTRACT: The aim of this retrospective study was to analyze the clinicopathologic characteristics and short-term and long-term outcomes of colorectal cancer patients with obstruction compared to those of non-obstructive colorectal cancer patients.
Between January 1998 and December 2005, 1,672 colorectal cancer patients undergoing operation were enrolled in this study. Patients were classified into two groups according to the presentation: patients with complete obstructive colorectal cancer (COC, n = 215) receiving emergency procedures and patients with non-obstructive colorectal cancer (NOC, n = 1,457) receiving elective procedures. The data on the clinicopathologic characteristics and short-term and long-term outcomes of patients were analyzed retrospectively.
Among 1,672 colorectal cancer patients, 215 cases presented with complete obstruction. The distribution of tumor location and size, macroscopic type, depth of invasion, liver metastasis, peritoneal carcinomatosis, and TNM stage were found to be different between the COC and NOC groups. Logistic regression analysis showed that tumor location, depth of invasion, and peritoneal carcinomatosis were independent factors associated with obstruction. Patients with obstruction had an increased risk of death by a factor of 2.251 compared to patients without obstruction. Peritoneal carcinomatosis and TNM stage were independent factors for the survival of the COC group. Obstruction, peritoneal carcinomatosis, tumor macroscopic type, and TNM stage were independent indicators for postoperative recurrence. Postoperative mortality was significantly higher in the COC group than the NOC group. The overall 5- and 10-year survival rates in the COC group were 47.8% and 42.8%, respectively, compared to 67.2% and 59.8% in the NOC group, respectively (p < 0.05). The postoperative recurrence rates were 43.1% in the COC group and 32.8% in the NOC group (p < 0.05).
Obstruction is an independent indicator for the survival and postoperative recurrence for patients with colorectal cancer. Patients in the COC group have worse overall survival with high postoperative recurrence rate compared to those in the NOC group.
Journal of Gastrointestinal Surgery 07/2011; 15(7):1213-22. · 2.83 Impact Factor
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ABSTRACT: In this paper, both the equivalent circuit models of the radial mode and the coupled thickness vibration mode of the radial mode piezoelectric transformer are deduced, and then with the Y-parameter matrix method and the dual-port network theory, an improved equivalent circuit model for the multilayer radial mode piezoelectric transformer is established. A radial mode transformer sample is tested to verify the equivalent circuit model. The experimental results show that the model proposed in this paper is more precise than the typical model.
IEEE transactions on ultrasonics, ferroelectrics, and frequency control 05/2011; 58(5):1069-76. · 1.80 Impact Factor
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ABSTRACT: We propose a circular flexural-vibration-mode piezoelectric transformer and perform a theoretical analysis of the transformer. An equivalent circuit is derived from the equations of piezoelectricity and the Hamilton's principle. With this equivalent circuit, the voltage gain ratio, input impedance, and the efficiency of the circular flexural-vibration-mode piezoelectric transformer can be determined. The basic behavior of the transformer is shown by numerical results.
IEEE transactions on ultrasonics, ferroelectrics, and frequency control 12/2010; 57(12):2764-71. · 1.80 Impact Factor
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Yanxin Luo,
Lei Wang,
Chuangqi Chen,
Dianke Chen,
Meijin Huang, Yihua Huang,
Junsheng Peng,
Ping Lan,
Ji Cui,
Shirong Cai,
Jianping Wang
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ABSTRACT: Hepatic resection (HR) is the only option offering a potential cure for patients with synchronous colorectal cancer liver metastases (SCRLM). The optimal timing of HR for SCRLM is still controversial. This study aimed to determine whether simultaneous HR is similar to staged resection regarding the morbidity and mortality rates in patients with SCRLM.
Four hundred and five consecutive patients with SCRLM were treated with either simultaneous (n = 129) or staged (n = 276) HR. The postoperative complications were analyzed retrospectively according to the documented records and hepatectomy databases at the Gastrointestinal Institute.
Perioperative morbidity and mortality did not differ between simultaneous resections and staged resections for selected patients with SCRLM (morbidity, 47.3% versus 54.3%; mortality, 1.5% versus 2.0%, respectively; both p > 0.05). Simultaneous liver resections of three or more segments would not increase the rate of complications compared to staged resections (56.8% and 42.4%, respectively; p = 0.119). Meanwhile, patients with simultaneous resections experienced shorter duration of surgery and postoperative hospitalization time as well as less blood loss during surgery (all p < 0.05).
Simultaneous resections of colorectal cancer primary lesions and hepatic metastases were safe and could serve as a primary option for selected SCRLM patients.
Journal of Gastrointestinal Surgery 12/2010; 14(12):1974-80. · 2.83 Impact Factor
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Complex Sciences, First International Conference, Complex 2009, Shanghai, China, February 23-25, 2009. Revised Papers, Part 1; 01/2009
