Military object detection and identification is a key capability in surveillance and reconnaissance.It is a major factor in warfare effectiveness and warfighter survivability.Inexpensive,portable,and rapidly deployabl...Military object detection and identification is a key capability in surveillance and reconnaissance.It is a major factor in warfare effectiveness and warfighter survivability.Inexpensive,portable,and rapidly deployable small unmanned aerial systems(s UAS)in conjunction with powerful deep learning(DL)based object detection models are expected to play an important role for this application.To prove overall feasibility of this approach,this paper discusses some aspects of designing and testing of an automated detection system to locate and identify small firearms left at the training range or at the battlefield.Such a system is envisioned to involve an s UAS equipped with a modern electro-optical(EO)sensor and relying on a trained convolutional neural network(CNN).Previous study by the authors devoted to finding projectiles on the ground revealed certain challenges such as small object size,changes in aspect ratio and image scale,motion blur,occlusion,and camouflage.This study attempts to deal with these challenges in a realistic operational scenario and go further by not only detecting different types of firearms but also classifying them into different categories.This study used a YOLOv2CNN(Res Net-50 backbone network)to train the model with ground truth data and demonstrated a high mean average precision(m AP)of 0.97 to detect and identify not only small pistols but also partially occluded rifles.展开更多
Fracture by firearms is a surgical emergency. The aim of our study was to report our experience in the management of open fractures by firearms and monitoring with a decline of 6 months the lesions observed in peaceti...Fracture by firearms is a surgical emergency. The aim of our study was to report our experience in the management of open fractures by firearms and monitoring with a decline of 6 months the lesions observed in peacetime. This retrospective study over 3 years (January 2007-November 2010), supplemented by a prospective (December 2010-November 2011) is based on an analysis of operative reports and clinical records of patients admitted to the Yaoundé Central Hospital. 29 cases were selected, including 35 lesions were observed. Our series consists of 27 men and 2 women, mean age 30 years. 40% of our patients were initially supported (debridement) before the 6th hour and 51.42% between the 6th and 24th hours. In terms of internal fixation, these figures were 66% between the 25th and 96th hours. The type of material was used as the external fixate (64.9%). Conversion processing by the establishment of an internal hardware, after 3 - 6 weeks and control NFS (numeration of blood count or blood count), VS (rate of sedimentation), CRP (C reactive protein). Unfortunately this has been possible only in two cases because of financial means. In 40% of cases, surgical outcome was simple, and complications to a type of osteomyelitis, shortening, suppuration in 42.7% of cases.展开更多
For nearly two decades, the eastern Democratic Republic of Congo (DRC) has been plagued by war and abnormal movement of firearms is commonplace. The consequence of this is the increasing number of victim patients from...For nearly two decades, the eastern Democratic Republic of Congo (DRC) has been plagued by war and abnormal movement of firearms is commonplace. The consequence of this is the increasing number of victim patients from gunshot wound at the hospitals. The aim of this study is to make an assessment of fractures caused by firearms and their management in a post conflict town. This is a retrospective, descriptive, multicenter study involving 123 cases with 128 fractures by firearms recorded during a period of 24 months from 1st January 2011 to 31st December 2012. Patients were recruited from 3 major hospitals in Bukavu town having a unit of fractures management. One hundred and six (86.9%) patients were males with the modal age in the ranks from 20 to 40 years old (mean 29.9 years). Seventy-one (57.7%) were civilians and 52 (42.3%) patients were soldiers;86 (78.2%) came from countryside. The reprisal was implicated in 77 (62.6%) cases. In 62.5% of cases, fractures were localized in the lower limbs and were treated orthopedically in ?50% of cases. The gunshot fractures in eastern DRC were mainly concerning the civilian young people living in the countryside and necessarily affected the bones of low limb. A study on fracture by firearms should be carried in the area where people have been wounded. Reducing the flow of gunshot could reduce the rate of fractures by firearms.展开更多
Penetrating craniocerebral firearm injuries remains one of the most lethal of all head traumas and are common in both war and peace time. Data were reviewed for 6487 moderately, severely head injuring patients (Glasgo...Penetrating craniocerebral firearm injuries remains one of the most lethal of all head traumas and are common in both war and peace time. Data were reviewed for 6487 moderately, severely head injuring patients (Glasgow Coma Scale (GCS) scores 3 to 12) tre展开更多
Analysis of free fall and acceleration of the mass on the Earth shows that using abstract entities such as absolute space or inertial space to explain mass dynamics leads to the violation of the principle of action an...Analysis of free fall and acceleration of the mass on the Earth shows that using abstract entities such as absolute space or inertial space to explain mass dynamics leads to the violation of the principle of action and reaction. Many scientists including Newton, Mach, and Einstein recognized that inertial force has no reaction that originates on mass. Einstein calls the lack of reaction to the inertial force a serious criticism of the space-time continuum concept. Presented is the hypothesis that the inertial force develops in an interaction of two masses via the force field. The inertial force created by such a field has reaction force. The dynamic gravitational field predicted is strong enough to be detected in the laboratory. This article describes the laboratory experiment which can prove or disprove the hypothesis of the dynamic gravitational field. The inertial force, calculated using the equation for the dynamic gravitational field, agrees with the behavior of inertial force observed in the experiments on the Earth. The movement of the planets in our solar system calculated using that equation is the same as that calculated using Newton’s method. The space properties calculated by the candidate equation explain the aberration of light and the results of light propagation experiments. The dynamic gravitational field can explain the discrepancy between the observed velocity of stars in the galaxy and those predicted by Newton’s theory of gravitation without the need for the dark matter hypothesis.展开更多
This paper focuses on studying the Noether symmetry and the conserved quantity with non-standard Lagrangians, namely exponential Lagrangians and power-law Lagrangians on time scales. Firstly, for each case, the Hamilt...This paper focuses on studying the Noether symmetry and the conserved quantity with non-standard Lagrangians, namely exponential Lagrangians and power-law Lagrangians on time scales. Firstly, for each case, the Hamilton prin- ciple based on the action with non-standard Lagrangians on time scales is established, with which the corresponding Euler-Lagrange equation is given. Secondly, according to the invariance of the Hamilton action under the infinitesimal transformation, the Noether theorem for the dynamical system with non-standard Lagrangians on time scales is established. The proof of the theorem consists of two steps. First, it is proved under the infinitesimal transformations of a special one-parameter group without transforming time. Second, utilizing the technique of time-re-parameterization, the Noether theorem in a general form is obtained. The Noether-type conserved quantities with non-standard Lagrangians in both clas- sical and discrete cases are given. Finally, an example in Friedmann-Robertson-Walker spacetime and an example about second order Duffing equation are given to illustrate the application of the results.展开更多
Objective. To study the characteristics and pathogenesis of gut barrier damage following multiple firearm injuries in a porcine model. Methods. Twenty four small pigs were divided into 4 groups: control group (n=6, gr...Objective. To study the characteristics and pathogenesis of gut barrier damage following multiple firearm injuries in a porcine model. Methods. Twenty four small pigs were divided into 4 groups: control group (n=6, group C), group H (n=6, gunshot induced tangential fracture of parietal bone), group L (n=6, gunshot induced comminuted fracture of bilateral femora) and group M (n=6, combined group H+L). Gastric intramucosal pH (pHi), plasma endotoxin levels in portal vein, and plasma D lactate levels were measured and blood samples were cultured at different intervals after trauma. The animals were sacrificed at 72 h following trauma and intestinal tissues were harvested for pathological examination and diamine oxidase (DAO) activity measurement. Results. In group M at 72 h, pHi was significantly lower than that of group H and L (P< 0.01), and plasma endotoxin level was significantly higher than that of group H (P< 0.01) and group L (P< 0.05). Simultaneously, in groupM, D lactate level was markedly higher than that of group H (P< 0.01), and incidence of positive blood culture was much higher than that of group H and L (P<0.05). Necrosis and exfoliation were revealed at ileum villus top in all traumagroups, especially in group M, in which ileum DAO activity declined most significantly as well. Conclusion. Multiple trauma is prone to cause gastrointestinal ischemia even without hemorrhagic shock. The damage of gut barrier in multiple trauma appears to be more severe than that in one site trauma, thereby promoting gut derived endotoxemia and bacterial translocation and contributing to the development of endogenous infection.SURGICAL TREATMENT OF MALIGNANTESOPHAGEAL TUMORS IN PUMC HOSPITAL Guo Huiqin,Li Zejian ,Zhang Fan1 ,Zhang Zhiyong,Xu Letian ,Li Weidong2,Wang Xiuqin2and Wu Min2Department of Thoracic Surgery, PUMC Hospital, CAMS &PUMC, Beijing 100730Key words malignant esophageal tumors; early diagnosis; FHIT geneTo study how to prolong the postoperative survival time of the patientswith malignant esophageal tumors. The clinical data of 1098 patients with malignant esophageal tumors from 1961 to 1992 were retrospectively analyzed. The deletion of fragile histamine triplet (FHIT) gene (a tumor suppressor gene) in 30 fresh esophageal samples obtained in 1996 was detected with PCR and RT PCR method. The resectability was raised gradually and the operative morbidity and mortality decreased year by year, but there was no significant improvement on the postoperative 5 year survival rate. Delayed diagnosis and irradical resection influenced the long term survival. The deletion of cDNA of FHIT gene was 64.2%in esophageal cancer and 20%in the resected margin of the cancer. We believe that high grade atypical hyperplasia in esophageal epithelium and deletion of FHIT gene in esophageal cancer and its resected margin are pathological and molecular markers for early diagnosis of esophageal cancer respectively, and the latter may be one of the molecular markers for the resection. Early diagnosis and treatment, radical resection, and postoperative nutritional support are very important for the improvement of the postoperative survival time of the patients.展开更多
Introduction: Thoracic wounds by firearms are frequent and severe. They may involve the patient’s prognosis. Objective: To study the epidemiological, clinical, paraclinical, therapeutic and evolutionary aspects of th...Introduction: Thoracic wounds by firearms are frequent and severe. They may involve the patient’s prognosis. Objective: To study the epidemiological, clinical, paraclinical, therapeutic and evolutionary aspects of the thoracic wounds by firearms. Material and method: This was a cross-sectional, descriptive study of all patients over the age of 15 who consulted in the university hospital-YO in the department of general and digestive surgery over a period of 5 years. Results: We collected 50 cases of thoracic wounds by firearms on 183 thoracic wounds with a prevalence of 27.3%. There were 48 men (96%). The average age was 30 years. The patients came from urban areas in 66% of cases;the informal sector accounted for 44% of the cases. The pistol was the most involved firearm (46.9%). The consultation period was less than 6 hours in 78% of patients. An unstable hemodynamic state was found in 42% (n = 21). A fluid and mixed pleural effusion syndrome was found in 46% and 26% of patients, respectively. Associated lesions were diaphragm involvement, and lesions of intra-abdominal hollow organs. Thoracic drainage was performed in 24 patients (48%) and was associated with a laparotomy in 8 patients. The average hospital stay was 7.5 days. Mortality was 14%. Conclusion: the thoracic wounds by firearms are frequent in civilian practice. The thoracic CT allows mapping of the lesions and thoracic drainage constitutes the essential part of surgical treatment. The fight against the proliferation of weapons deserves to be promoted.展开更多
文摘Military object detection and identification is a key capability in surveillance and reconnaissance.It is a major factor in warfare effectiveness and warfighter survivability.Inexpensive,portable,and rapidly deployable small unmanned aerial systems(s UAS)in conjunction with powerful deep learning(DL)based object detection models are expected to play an important role for this application.To prove overall feasibility of this approach,this paper discusses some aspects of designing and testing of an automated detection system to locate and identify small firearms left at the training range or at the battlefield.Such a system is envisioned to involve an s UAS equipped with a modern electro-optical(EO)sensor and relying on a trained convolutional neural network(CNN).Previous study by the authors devoted to finding projectiles on the ground revealed certain challenges such as small object size,changes in aspect ratio and image scale,motion blur,occlusion,and camouflage.This study attempts to deal with these challenges in a realistic operational scenario and go further by not only detecting different types of firearms but also classifying them into different categories.This study used a YOLOv2CNN(Res Net-50 backbone network)to train the model with ground truth data and demonstrated a high mean average precision(m AP)of 0.97 to detect and identify not only small pistols but also partially occluded rifles.
文摘Fracture by firearms is a surgical emergency. The aim of our study was to report our experience in the management of open fractures by firearms and monitoring with a decline of 6 months the lesions observed in peacetime. This retrospective study over 3 years (January 2007-November 2010), supplemented by a prospective (December 2010-November 2011) is based on an analysis of operative reports and clinical records of patients admitted to the Yaoundé Central Hospital. 29 cases were selected, including 35 lesions were observed. Our series consists of 27 men and 2 women, mean age 30 years. 40% of our patients were initially supported (debridement) before the 6th hour and 51.42% between the 6th and 24th hours. In terms of internal fixation, these figures were 66% between the 25th and 96th hours. The type of material was used as the external fixate (64.9%). Conversion processing by the establishment of an internal hardware, after 3 - 6 weeks and control NFS (numeration of blood count or blood count), VS (rate of sedimentation), CRP (C reactive protein). Unfortunately this has been possible only in two cases because of financial means. In 40% of cases, surgical outcome was simple, and complications to a type of osteomyelitis, shortening, suppuration in 42.7% of cases.
文摘For nearly two decades, the eastern Democratic Republic of Congo (DRC) has been plagued by war and abnormal movement of firearms is commonplace. The consequence of this is the increasing number of victim patients from gunshot wound at the hospitals. The aim of this study is to make an assessment of fractures caused by firearms and their management in a post conflict town. This is a retrospective, descriptive, multicenter study involving 123 cases with 128 fractures by firearms recorded during a period of 24 months from 1st January 2011 to 31st December 2012. Patients were recruited from 3 major hospitals in Bukavu town having a unit of fractures management. One hundred and six (86.9%) patients were males with the modal age in the ranks from 20 to 40 years old (mean 29.9 years). Seventy-one (57.7%) were civilians and 52 (42.3%) patients were soldiers;86 (78.2%) came from countryside. The reprisal was implicated in 77 (62.6%) cases. In 62.5% of cases, fractures were localized in the lower limbs and were treated orthopedically in ?50% of cases. The gunshot fractures in eastern DRC were mainly concerning the civilian young people living in the countryside and necessarily affected the bones of low limb. A study on fracture by firearms should be carried in the area where people have been wounded. Reducing the flow of gunshot could reduce the rate of fractures by firearms.
文摘Penetrating craniocerebral firearm injuries remains one of the most lethal of all head traumas and are common in both war and peace time. Data were reviewed for 6487 moderately, severely head injuring patients (Glasgow Coma Scale (GCS) scores 3 to 12) tre
文摘Analysis of free fall and acceleration of the mass on the Earth shows that using abstract entities such as absolute space or inertial space to explain mass dynamics leads to the violation of the principle of action and reaction. Many scientists including Newton, Mach, and Einstein recognized that inertial force has no reaction that originates on mass. Einstein calls the lack of reaction to the inertial force a serious criticism of the space-time continuum concept. Presented is the hypothesis that the inertial force develops in an interaction of two masses via the force field. The inertial force created by such a field has reaction force. The dynamic gravitational field predicted is strong enough to be detected in the laboratory. This article describes the laboratory experiment which can prove or disprove the hypothesis of the dynamic gravitational field. The inertial force, calculated using the equation for the dynamic gravitational field, agrees with the behavior of inertial force observed in the experiments on the Earth. The movement of the planets in our solar system calculated using that equation is the same as that calculated using Newton’s method. The space properties calculated by the candidate equation explain the aberration of light and the results of light propagation experiments. The dynamic gravitational field can explain the discrepancy between the observed velocity of stars in the galaxy and those predicted by Newton’s theory of gravitation without the need for the dark matter hypothesis.
基金supported by the National Natural Science Foundation of China(Grant Nos.11572212 and 11272227)the Innovation Program of Suzhou University of Science and Technology,China(Grant No.SKYCX16 012)
文摘This paper focuses on studying the Noether symmetry and the conserved quantity with non-standard Lagrangians, namely exponential Lagrangians and power-law Lagrangians on time scales. Firstly, for each case, the Hamilton prin- ciple based on the action with non-standard Lagrangians on time scales is established, with which the corresponding Euler-Lagrange equation is given. Secondly, according to the invariance of the Hamilton action under the infinitesimal transformation, the Noether theorem for the dynamical system with non-standard Lagrangians on time scales is established. The proof of the theorem consists of two steps. First, it is proved under the infinitesimal transformations of a special one-parameter group without transforming time. Second, utilizing the technique of time-re-parameterization, the Noether theorem in a general form is obtained. The Noether-type conserved quantities with non-standard Lagrangians in both clas- sical and discrete cases are given. Finally, an example in Friedmann-Robertson-Walker spacetime and an example about second order Duffing equation are given to illustrate the application of the results.
文摘Objective. To study the characteristics and pathogenesis of gut barrier damage following multiple firearm injuries in a porcine model. Methods. Twenty four small pigs were divided into 4 groups: control group (n=6, group C), group H (n=6, gunshot induced tangential fracture of parietal bone), group L (n=6, gunshot induced comminuted fracture of bilateral femora) and group M (n=6, combined group H+L). Gastric intramucosal pH (pHi), plasma endotoxin levels in portal vein, and plasma D lactate levels were measured and blood samples were cultured at different intervals after trauma. The animals were sacrificed at 72 h following trauma and intestinal tissues were harvested for pathological examination and diamine oxidase (DAO) activity measurement. Results. In group M at 72 h, pHi was significantly lower than that of group H and L (P< 0.01), and plasma endotoxin level was significantly higher than that of group H (P< 0.01) and group L (P< 0.05). Simultaneously, in groupM, D lactate level was markedly higher than that of group H (P< 0.01), and incidence of positive blood culture was much higher than that of group H and L (P<0.05). Necrosis and exfoliation were revealed at ileum villus top in all traumagroups, especially in group M, in which ileum DAO activity declined most significantly as well. Conclusion. Multiple trauma is prone to cause gastrointestinal ischemia even without hemorrhagic shock. The damage of gut barrier in multiple trauma appears to be more severe than that in one site trauma, thereby promoting gut derived endotoxemia and bacterial translocation and contributing to the development of endogenous infection.SURGICAL TREATMENT OF MALIGNANTESOPHAGEAL TUMORS IN PUMC HOSPITAL Guo Huiqin,Li Zejian ,Zhang Fan1 ,Zhang Zhiyong,Xu Letian ,Li Weidong2,Wang Xiuqin2and Wu Min2Department of Thoracic Surgery, PUMC Hospital, CAMS &PUMC, Beijing 100730Key words malignant esophageal tumors; early diagnosis; FHIT geneTo study how to prolong the postoperative survival time of the patientswith malignant esophageal tumors. The clinical data of 1098 patients with malignant esophageal tumors from 1961 to 1992 were retrospectively analyzed. The deletion of fragile histamine triplet (FHIT) gene (a tumor suppressor gene) in 30 fresh esophageal samples obtained in 1996 was detected with PCR and RT PCR method. The resectability was raised gradually and the operative morbidity and mortality decreased year by year, but there was no significant improvement on the postoperative 5 year survival rate. Delayed diagnosis and irradical resection influenced the long term survival. The deletion of cDNA of FHIT gene was 64.2%in esophageal cancer and 20%in the resected margin of the cancer. We believe that high grade atypical hyperplasia in esophageal epithelium and deletion of FHIT gene in esophageal cancer and its resected margin are pathological and molecular markers for early diagnosis of esophageal cancer respectively, and the latter may be one of the molecular markers for the resection. Early diagnosis and treatment, radical resection, and postoperative nutritional support are very important for the improvement of the postoperative survival time of the patients.
文摘Introduction: Thoracic wounds by firearms are frequent and severe. They may involve the patient’s prognosis. Objective: To study the epidemiological, clinical, paraclinical, therapeutic and evolutionary aspects of the thoracic wounds by firearms. Material and method: This was a cross-sectional, descriptive study of all patients over the age of 15 who consulted in the university hospital-YO in the department of general and digestive surgery over a period of 5 years. Results: We collected 50 cases of thoracic wounds by firearms on 183 thoracic wounds with a prevalence of 27.3%. There were 48 men (96%). The average age was 30 years. The patients came from urban areas in 66% of cases;the informal sector accounted for 44% of the cases. The pistol was the most involved firearm (46.9%). The consultation period was less than 6 hours in 78% of patients. An unstable hemodynamic state was found in 42% (n = 21). A fluid and mixed pleural effusion syndrome was found in 46% and 26% of patients, respectively. Associated lesions were diaphragm involvement, and lesions of intra-abdominal hollow organs. Thoracic drainage was performed in 24 patients (48%) and was associated with a laparotomy in 8 patients. The average hospital stay was 7.5 days. Mortality was 14%. Conclusion: the thoracic wounds by firearms are frequent in civilian practice. The thoracic CT allows mapping of the lesions and thoracic drainage constitutes the essential part of surgical treatment. The fight against the proliferation of weapons deserves to be promoted.
