AIM:To study and assess clinical outcomes of various modes of treatment for perforated giant gastric ulcer in an emergency setting.METHODS:From May 2010 to February 2013,20cases of perforated giant gastric ulcer(>2...AIM:To study and assess clinical outcomes of various modes of treatment for perforated giant gastric ulcer in an emergency setting.METHODS:From May 2010 to February 2013,20cases of perforated giant gastric ulcer(>2 cm)were operated on in an emergency setting.All the patients presented with features of peritonitis and were resuscitated aggressively before taking for surgery.In the first4 cases,primary closure was done after taking a biopsy and among these,the 3rdcase also underwent partial distal gastrectomy and gastrojejunostomy and the 4th case underwent a radical subtotal gastrectomy with D2 lymphadenectomy and gastrojejunostomy for malignancy.All the remaining 16 cases underwent partial distal gastrectomy and gastrojejunostomy.RESULTS:Among the first 4 cases,2 had an uneventful recovery and were discharged on the 6thpostoperative day.The 3rdand 4thpatients developed gastricfistula,leading to prolonged hospitalization.For the 3rd patient,conservative management was tried for 1 wk,followed by partial distal gastrectomy and gastrojejunostomy,and he was discharged on the 20thday after admission,while the 4thpatient underwent a radical subtotal gastrectomy with D2 lymphadenectomy and gastrojejunostomy.Postoperatively,he developed adult respiratory distress syndrome,multiorgan dysfunction syndrome and expired on the 3rdpostoperative day of the second surgery.All the remaining 16 patients underwent partial distal gastrectomy and gastrojejunostomy and recovered well.Among these,4 of them were malignant and the remaining were benign ulcers.All had an uneventful recovery.The percentage of malignancy in our series was 30%(6 out of 20 cases).In our study,86%had an uneventful recovery,complications were seen in about 10%,and mortality was about 5%.CONCLUSION:In giant gastric ulcer,the chances of malignancy and leak after primary closure are high.So,we feel that partial distal gastrectomy and gastrojejunostomy is better.展开更多
Because of the speed limitation of the conventional bit-selection strategy in the exi- sting weighted bit flipping algorithms, a high- speed Low-Density Parity-Check （LDPC） dec- oder cannot be realised. To solve thi...Because of the speed limitation of the conventional bit-selection strategy in the exi- sting weighted bit flipping algorithms, a high- speed Low-Density Parity-Check （LDPC） dec- oder cannot be realised. To solve this problem, we propose a fast weighted bit flipping algo- rithm. Specifically, based on the identically dis- tributed error bits, a parallel bit-selection met- hod is proposed to reduce the selection delay of the flipped bits. The delay analysis demon- strates that, the decoding speed of LDPC codes can be significantly improved by the proposed algorithm. Furthermore, simulation results ver- ify the validity of the proposed algorithm.展开更多
This scientific paper is a comparative analysis of two mathematical conjectures. The newly proposed -3(-n) - 1 Remer conjecture and how it is related to and a proof of the more well known 3n + 1 Collatz conjecture. An...This scientific paper is a comparative analysis of two mathematical conjectures. The newly proposed -3(-n) - 1 Remer conjecture and how it is related to and a proof of the more well known 3n + 1 Collatz conjecture. An overview of both conjectures and their respective iterative processes will be presented. Showcasing their unique properties and behavior to each other. Through a detailed comparison, we highlight the similarities and differences between these two conjectures and discuss their significance in the field of mathematics. And how they prove each other to be true.展开更多
针对长江中下游稻区不同粳稻品种,以不同纬度多个地点的860份稻米样本为材料,基于11项食味品质指标,运用主成分分析、多元线性回归、偏最小二乘法、判别分析、分类回归树(classification and regression free,CART)决策树与反向传播(bac...针对长江中下游稻区不同粳稻品种,以不同纬度多个地点的860份稻米样本为材料,基于11项食味品质指标,运用主成分分析、多元线性回归、偏最小二乘法、判别分析、分类回归树(classification and regression free,CART)决策树与反向传播(back propagation,BP)神经网络分别建立稻米食味品质等级预测模型,通过验证模型的准确性与稳定性,筛选出适合稻米食味品质综合评价的方法或模型。结果表明:BP神经网络模型的2次验证准确度与稳定性均最高,预测准确率分别为92.68%与92.31%;偏最小二乘法模型的2次预测准确率均在80%以上(分别为80.49%、87.18%),但2次验证结果相差较大(6.69%);判别分析与多元线性回归模型的平均预测准确率相近(分别为80.12%、78.77%),但判别分析模型的稳定性优于多元线性回归模型;主成分分析模型的平均预测准确率最低(67.32%),且2次验证结果差异也较大(8.94%);CART决策树模型的稳定性最差,2次验证准确率分别为53.66%与89.74%,相差达36.08%。因此,利用BP神经网络模型预测稻米食味品质等级具有较高的准确性与稳定性,可为长江中下游稻区稻米食味品质综合评价与优质食味水稻品种的筛选提供理论与方法支持。展开更多
Under some conditions on probability, the author obtains some results on the complete convergence for partial sums of not necessary identically distributed p-mixing se- quences, and the complete convergence for partia...Under some conditions on probability, the author obtains some results on the complete convergence for partial sums of not necessary identically distributed p-mixing se- quences, and the complete convergence for partial sums of B-valued martingale differences is also studied. As application the author gives the corresponding results on the complete convergence for randomly indexed partial sums.展开更多
文摘AIM:To study and assess clinical outcomes of various modes of treatment for perforated giant gastric ulcer in an emergency setting.METHODS:From May 2010 to February 2013,20cases of perforated giant gastric ulcer(>2 cm)were operated on in an emergency setting.All the patients presented with features of peritonitis and were resuscitated aggressively before taking for surgery.In the first4 cases,primary closure was done after taking a biopsy and among these,the 3rdcase also underwent partial distal gastrectomy and gastrojejunostomy and the 4th case underwent a radical subtotal gastrectomy with D2 lymphadenectomy and gastrojejunostomy for malignancy.All the remaining 16 cases underwent partial distal gastrectomy and gastrojejunostomy.RESULTS:Among the first 4 cases,2 had an uneventful recovery and were discharged on the 6thpostoperative day.The 3rdand 4thpatients developed gastricfistula,leading to prolonged hospitalization.For the 3rd patient,conservative management was tried for 1 wk,followed by partial distal gastrectomy and gastrojejunostomy,and he was discharged on the 20thday after admission,while the 4thpatient underwent a radical subtotal gastrectomy with D2 lymphadenectomy and gastrojejunostomy.Postoperatively,he developed adult respiratory distress syndrome,multiorgan dysfunction syndrome and expired on the 3rdpostoperative day of the second surgery.All the remaining 16 patients underwent partial distal gastrectomy and gastrojejunostomy and recovered well.Among these,4 of them were malignant and the remaining were benign ulcers.All had an uneventful recovery.The percentage of malignancy in our series was 30%(6 out of 20 cases).In our study,86%had an uneventful recovery,complications were seen in about 10%,and mortality was about 5%.CONCLUSION:In giant gastric ulcer,the chances of malignancy and leak after primary closure are high.So,we feel that partial distal gastrectomy and gastrojejunostomy is better.
基金supported in part by the National Natural Science Foundation of China under Grant No.61072069the Fundamental Research Funds for the Central Universities under Grant No.72001859+1 种基金the Important National Science and Technology Specific Projects under Grant No.2011ZX03003-001-04the One Church,One Family,One Purpose Project(111 Project)under Grant No.B08038
文摘Because of the speed limitation of the conventional bit-selection strategy in the exi- sting weighted bit flipping algorithms, a high- speed Low-Density Parity-Check （LDPC） dec- oder cannot be realised. To solve this problem, we propose a fast weighted bit flipping algo- rithm. Specifically, based on the identically dis- tributed error bits, a parallel bit-selection met- hod is proposed to reduce the selection delay of the flipped bits. The delay analysis demon- strates that, the decoding speed of LDPC codes can be significantly improved by the proposed algorithm. Furthermore, simulation results ver- ify the validity of the proposed algorithm.
文摘This scientific paper is a comparative analysis of two mathematical conjectures. The newly proposed -3(-n) - 1 Remer conjecture and how it is related to and a proof of the more well known 3n + 1 Collatz conjecture. An overview of both conjectures and their respective iterative processes will be presented. Showcasing their unique properties and behavior to each other. Through a detailed comparison, we highlight the similarities and differences between these two conjectures and discuss their significance in the field of mathematics. And how they prove each other to be true.
文摘针对长江中下游稻区不同粳稻品种,以不同纬度多个地点的860份稻米样本为材料,基于11项食味品质指标,运用主成分分析、多元线性回归、偏最小二乘法、判别分析、分类回归树(classification and regression free,CART)决策树与反向传播(back propagation,BP)神经网络分别建立稻米食味品质等级预测模型,通过验证模型的准确性与稳定性,筛选出适合稻米食味品质综合评价的方法或模型。结果表明:BP神经网络模型的2次验证准确度与稳定性均最高,预测准确率分别为92.68%与92.31%;偏最小二乘法模型的2次预测准确率均在80%以上(分别为80.49%、87.18%),但2次验证结果相差较大(6.69%);判别分析与多元线性回归模型的平均预测准确率相近(分别为80.12%、78.77%),但判别分析模型的稳定性优于多元线性回归模型;主成分分析模型的平均预测准确率最低(67.32%),且2次验证结果差异也较大(8.94%);CART决策树模型的稳定性最差,2次验证准确率分别为53.66%与89.74%,相差达36.08%。因此,利用BP神经网络模型预测稻米食味品质等级具有较高的准确性与稳定性,可为长江中下游稻区稻米食味品质综合评价与优质食味水稻品种的筛选提供理论与方法支持。
文摘Under some conditions on probability, the author obtains some results on the complete convergence for partial sums of not necessary identically distributed p-mixing se- quences, and the complete convergence for partial sums of B-valued martingale differences is also studied. As application the author gives the corresponding results on the complete convergence for randomly indexed partial sums.
