Introduction: Placenta accreta is a potentially life threatening obstetrical condition. The incidence has increased. Diagnosis before delivery allows multidisciplinary planning in an attempt to minimize potential mate...Introduction: Placenta accreta is a potentially life threatening obstetrical condition. The incidence has increased. Diagnosis before delivery allows multidisciplinary planning in an attempt to minimize potential maternal or neonatal morbidity and mortality. Prenatal ultrasonography is used to support the diagnosis and guide clinical management leading probably to favorable outcomes. Actually a conservative option which includes leaving all or part of the placenta in situ when fertility preservation is desired is recommended. Methods: We retrospectively reviewed the medical records of all patients diagnosed with placenta accreta in gynecology-obstetrics department of the university hospital Mohammed the VI of Marrakesh;Morocco;from January the first 2014 to January the second 2016. Results: We found seven cases. We described: The epidemiological characteristics, risk factors, management of placenta accreta, outcomes and prognosis. The incidence of placenta accreta was 1/3847 deliveries. The mean term of delivery was 35 weeks. We have adopted a successful conservative treatment in six cases (71.4%). The radical treatment was adopted in one patient initially admitted for severe post-partum hemorrhage;the prognosis was good in 85.7% cases. Conclusion: Conservative management of placenta accreta is a safe and efficient and is an interesting alternative for hysterectomy.展开更多
Despite Kerckhoff’s principle,there are secret ciphers with unknown components for diplomatic or military usages.The side-channel analysis of reverse engineering(SCARE)is developed for analyzing secret ciphers.Consid...Despite Kerckhoff’s principle,there are secret ciphers with unknown components for diplomatic or military usages.The side-channel analysis of reverse engineering(SCARE)is developed for analyzing secret ciphers.Considering the side-channel leakage,SCARE attacks enable the recovery of some secret parts of a cryptosystem,e.g.,the substitution box table.However,based on idealized leakage assumption,most of these attacks have a few limitations on prior knowledge or implementations.In this paper,we focus on AES-like block ciphers with a secret S-box and demonstrate an attack which recovers both the secret key and the secret S-box.On the one hand,the key is recovered under profiled circumstance by leakage analysis and collision attack.On the other hand,the SCARE attack is based on mathematical analysis.It relies on Hamming weight of MixColumns intermediate results in the first round,which can restore the secret S-box.Experiments are performed on real power traces from a software implementation of AES-like block cipher.Moreover,we evaluate the soundness and efficiency of our method by simulations and compare with previous approaches.Our method has more advantages in intermediate results location and the required number of traces.For simulated traces with gaussian noise,our method requires 100000 traces to fully restore the secret S-box,while the previous method requires nearly 300000 traces to restore S-box.展开更多
China steps up a clampdown on the financing vehicles of local governments control over local governments’ financing vehicles will be tightened to fend off what some economists warn could turn into a
文摘Introduction: Placenta accreta is a potentially life threatening obstetrical condition. The incidence has increased. Diagnosis before delivery allows multidisciplinary planning in an attempt to minimize potential maternal or neonatal morbidity and mortality. Prenatal ultrasonography is used to support the diagnosis and guide clinical management leading probably to favorable outcomes. Actually a conservative option which includes leaving all or part of the placenta in situ when fertility preservation is desired is recommended. Methods: We retrospectively reviewed the medical records of all patients diagnosed with placenta accreta in gynecology-obstetrics department of the university hospital Mohammed the VI of Marrakesh;Morocco;from January the first 2014 to January the second 2016. Results: We found seven cases. We described: The epidemiological characteristics, risk factors, management of placenta accreta, outcomes and prognosis. The incidence of placenta accreta was 1/3847 deliveries. The mean term of delivery was 35 weeks. We have adopted a successful conservative treatment in six cases (71.4%). The radical treatment was adopted in one patient initially admitted for severe post-partum hemorrhage;the prognosis was good in 85.7% cases. Conclusion: Conservative management of placenta accreta is a safe and efficient and is an interesting alternative for hysterectomy.
基金supported by the National Natural Science Foundation of China(Grant Nos.61872040,U1836101,61871037,62002021)National Cryptography Development Fund(MMJ20170201)Beijing Natural Science Foundation(4202070).
文摘Despite Kerckhoff’s principle,there are secret ciphers with unknown components for diplomatic or military usages.The side-channel analysis of reverse engineering(SCARE)is developed for analyzing secret ciphers.Considering the side-channel leakage,SCARE attacks enable the recovery of some secret parts of a cryptosystem,e.g.,the substitution box table.However,based on idealized leakage assumption,most of these attacks have a few limitations on prior knowledge or implementations.In this paper,we focus on AES-like block ciphers with a secret S-box and demonstrate an attack which recovers both the secret key and the secret S-box.On the one hand,the key is recovered under profiled circumstance by leakage analysis and collision attack.On the other hand,the SCARE attack is based on mathematical analysis.It relies on Hamming weight of MixColumns intermediate results in the first round,which can restore the secret S-box.Experiments are performed on real power traces from a software implementation of AES-like block cipher.Moreover,we evaluate the soundness and efficiency of our method by simulations and compare with previous approaches.Our method has more advantages in intermediate results location and the required number of traces.For simulated traces with gaussian noise,our method requires 100000 traces to fully restore the secret S-box,while the previous method requires nearly 300000 traces to restore S-box.
文摘China steps up a clampdown on the financing vehicles of local governments control over local governments’ financing vehicles will be tightened to fend off what some economists warn could turn into a
