Side-scan sonar(SSS)is essential for acquiring high-resolution seafloor images over large areas,facilitat-ing the identification of subsea objects.However,military security restrictions and the scarcity of subsea targ...Side-scan sonar(SSS)is essential for acquiring high-resolution seafloor images over large areas,facilitat-ing the identification of subsea objects.However,military security restrictions and the scarcity of subsea targets limit the availability of SSS data,posing challenges for Automatic Target Recognition(ATR)research.This paper presents an approach that uses Cycle-Consistent Generative Adversarial Networks(CycleGAN)to augment SSS images of key subsea objects,such as shipwrecks,aircraft,and drowning victims.The process begins by constructing 3D models to generate rendered images with realistic shadows frommultiple angles.To enhance image quality,a shadowextractor and shadow region loss function are introduced to ensure consistent shadowrepresentation.Additionally,amulti-resolution learning structure enables effective training,even with limited data availability.The experimental results show that the generated data improved object detection accuracy when they were used for training and demonstrated the ability to generate clear shadow and background regions with stability.展开更多
Coronavirus disease 2019(COVID-19)has had a substantial global health impact,with over 765 million confirmed cases and nearly 7 million deaths.[1]In South Korea,stringent lockdown policy heavily restricted the daily a...Coronavirus disease 2019(COVID-19)has had a substantial global health impact,with over 765 million confirmed cases and nearly 7 million deaths.[1]In South Korea,stringent lockdown policy heavily restricted the daily activities for over two years,resulting in widespread public health issues.展开更多
BACKGROUND Inferior mesenteric arteriovenous fistula(IMAVF)is an uncommon circulatory malformation with few reported instances.It entails a direct arteriovenous communication within the inferior mesenteric vascular sy...BACKGROUND Inferior mesenteric arteriovenous fistula(IMAVF)is an uncommon circulatory malformation with few reported instances.It entails a direct arteriovenous communication within the inferior mesenteric vascular system,producing abnormal hemodynamic flow that may result in gastrointestinal hypoperfusion,elevated portal venous pressure,and secondary cardiac dysfunction.Diagnosis often experiences delays because of nonspecific symptoms.Imaging modalities,such as multi-detector computed tomography(MDCT)and angiography,prove essential for accurate diagnosis and treatment planning.CASE SUMMARY Over a 10-year period,only two cases of IMAVF were encountered.The initial case involved a 56-year-old male without notable prior medical conditions who experienced intermittent lower abdominal discomfort,diarrhea,and hematochezia over several months.Ischemic colitis with an IMAVF was revealed through colonoscopy and MDCT angiography.Due to the size of the IMAVF,Hartmann’s procedure was performed instead of an endovascular intervention.Recovery proceeded uneventfully,and the colostomy was reversed one year later,with no recurrence observed on follow-up imaging.The subsequent case involved a 76-year-old female with repeated left-sided pyelonephritis and colonic diverticular disease,who manifested with abdominal discomfort and hematochezia.In contrast to previous computed tomography scans,MDCT and angiography revealed a newly developed IMAVF.Given her unstable vital signs,emergency laparoscopic total colectomy with ileorectal anastomosis and temporary ileostomy was conducted.Recovery occurred without complications,and the ileostomy was successfully reversed 2 months later,with no recurrence noted.CONCLUSION These cases emphasize the need to evaluate for vascular abnormalities in individuals presenting with ischemic colitis and unexplained gastrointestinal bleeding.The second case demonstrates that recurrent intra-abdominal inflammation may contribute to the development of IMAVF.展开更多
To improve watertightness and antibiosis of sewage structure concrete, the antimicrobial watertight admixture was made with fluosilicate salts and antimicrobial compounds. And fresh properties, watertightness, harmles...To improve watertightness and antibiosis of sewage structure concrete, the antimicrobial watertight admixture was made with fluosilicate salts and antimicrobial compounds. And fresh properties, watertightness, harmlessness and antibiosis of concrete were investigated experimentally. As a result, the fresh properties of concrete were similar to those of an ordinary concrete, without setting time delay. Compressive strength and carbonation resistance of concrete were better than those of an ordinary concrete. Finally it was confirmed that the antimicrobial watertight admixture of concrete had an antibiosis inhibiting SOB growth.展开更多
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.RS-2024-00334159)the Korea Institute of Ocean Science and Technology(KIOST)project entitled“Development of Maritime Domain Awareness Technology for Sea Power Enhancement”(PEA0332).
文摘Side-scan sonar(SSS)is essential for acquiring high-resolution seafloor images over large areas,facilitat-ing the identification of subsea objects.However,military security restrictions and the scarcity of subsea targets limit the availability of SSS data,posing challenges for Automatic Target Recognition(ATR)research.This paper presents an approach that uses Cycle-Consistent Generative Adversarial Networks(CycleGAN)to augment SSS images of key subsea objects,such as shipwrecks,aircraft,and drowning victims.The process begins by constructing 3D models to generate rendered images with realistic shadows frommultiple angles.To enhance image quality,a shadowextractor and shadow region loss function are introduced to ensure consistent shadowrepresentation.Additionally,amulti-resolution learning structure enables effective training,even with limited data availability.The experimental results show that the generated data improved object detection accuracy when they were used for training and demonstrated the ability to generate clear shadow and background regions with stability.
基金supported by the Convergence Medical Institute of Technology Policy Research Project(CMIT PRP 2022-03)at Pusan National University Hospital.
文摘Coronavirus disease 2019(COVID-19)has had a substantial global health impact,with over 765 million confirmed cases and nearly 7 million deaths.[1]In South Korea,stringent lockdown policy heavily restricted the daily activities for over two years,resulting in widespread public health issues.
文摘BACKGROUND Inferior mesenteric arteriovenous fistula(IMAVF)is an uncommon circulatory malformation with few reported instances.It entails a direct arteriovenous communication within the inferior mesenteric vascular system,producing abnormal hemodynamic flow that may result in gastrointestinal hypoperfusion,elevated portal venous pressure,and secondary cardiac dysfunction.Diagnosis often experiences delays because of nonspecific symptoms.Imaging modalities,such as multi-detector computed tomography(MDCT)and angiography,prove essential for accurate diagnosis and treatment planning.CASE SUMMARY Over a 10-year period,only two cases of IMAVF were encountered.The initial case involved a 56-year-old male without notable prior medical conditions who experienced intermittent lower abdominal discomfort,diarrhea,and hematochezia over several months.Ischemic colitis with an IMAVF was revealed through colonoscopy and MDCT angiography.Due to the size of the IMAVF,Hartmann’s procedure was performed instead of an endovascular intervention.Recovery proceeded uneventfully,and the colostomy was reversed one year later,with no recurrence observed on follow-up imaging.The subsequent case involved a 76-year-old female with repeated left-sided pyelonephritis and colonic diverticular disease,who manifested with abdominal discomfort and hematochezia.In contrast to previous computed tomography scans,MDCT and angiography revealed a newly developed IMAVF.Given her unstable vital signs,emergency laparoscopic total colectomy with ileorectal anastomosis and temporary ileostomy was conducted.Recovery occurred without complications,and the ileostomy was successfully reversed 2 months later,with no recurrence noted.CONCLUSION These cases emphasize the need to evaluate for vascular abnormalities in individuals presenting with ischemic colitis and unexplained gastrointestinal bleeding.The second case demonstrates that recurrent intra-abdominal inflammation may contribute to the development of IMAVF.
基金Brain Korea 2th (BK21) funded by the Korean Government
文摘To improve watertightness and antibiosis of sewage structure concrete, the antimicrobial watertight admixture was made with fluosilicate salts and antimicrobial compounds. And fresh properties, watertightness, harmlessness and antibiosis of concrete were investigated experimentally. As a result, the fresh properties of concrete were similar to those of an ordinary concrete, without setting time delay. Compressive strength and carbonation resistance of concrete were better than those of an ordinary concrete. Finally it was confirmed that the antimicrobial watertight admixture of concrete had an antibiosis inhibiting SOB growth.
