8 results on '"YOUNG WOOK JEON"'
Search Results
2. MRI Findings of Spinal Angiomyolipoma: A Case Report and Literature Review
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Sang A Lee, Young Wook Jeon, Myung Soon Kim, and Soon Hee Jung
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epidural neoplasms ,spinal canal ,angiomyolipoma ,angiolipoma ,magnetic resonance imaging ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 - Abstract
Spinal angiomyolipoma (AML) is a rare disease. It is often reviewed with spinal angiolipoma. Both are composed of vascular and mature adipose elements. However, only AML contains broader array of mesenchymal component. They are accounting for 0.14% to 1.2% of spinal tumors. They appear as fat containing hypervascular tumor located at epidural space of thoracic spine. Spinal AML is more frequently infiltrative and ofted occurs more ventrally than angiolipoma. Previous studies have employed conventional radiograph, myelogram, and CT scan for spinal AML studies. Recently, MRI has been used for spinal AML in a few studies. Here, we describe a case of typical thoracic spinal AML with a review of its MRI findings and other differential diagnosis for epidural spinal mass with similar characteristics.
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- 2017
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3. Effect of epidural corticosteroid injection on magnetic resonance imaging findings
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Minsoo Kim, Tae Yoon Jeong, Hyun Ho Seong, In Nam Kim, Byeong Mun Hwang, Young Wook Jeon, Seong Sik Kang, So Young Lim, Tsong Bin Chang, and Yu Seon Cheong
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medicine.medical_specialty ,medicine.drug_class ,Tuohy needle ,03 medical and health sciences ,Magnetic resonance imaging ,0302 clinical medicine ,030202 anesthesiology ,Needle ,medicine ,Abnormal Finding ,In patient ,Epidural space ,Glucocorticoids ,medicine.diagnostic_test ,business.industry ,Air ,Soft tissue ,Low back pain ,Epidural injection ,Anesthesiology and Pain Medicine ,medicine.anatomical_structure ,Corticosteroid ,Original Article ,Radiology ,medicine.symptom ,Artifacts ,business ,030217 neurology & neurosurgery - Abstract
Background Magnetic resonance imaging (MRI) of the spine is the preferred diagnostic tool for pathologic conditions affecting the spine. However, in patients receiving epidural corticosteroid injection (ESI) for treatment of spinal diseases, there is a possibility of misreading of MR images because of air or fluid in the epidural space after the injection. Therefore, we defined the characteristics of abnormal changes in MRI findings following an ESI in patients with low back pain. Methods We reviewed the medical records of 133 patients who underwent MRI of the lumbar spine within 7 days after ESI between 2006 and 2015.All patients were administered an ESI using a 22-gauge Tuohy needle at the lumbar spine through the interlaminar approach. The epidural space was identified by the loss of resistance technique with air. Results The incidences of abnormal changes in MRI findings because of ESI were 54%, 31%, and 25% in patients who underwent MRI at approximately 24 h, and 2 and 3 days after ESI, respectively. Abnormal MRI findings included epidural air or fluid, needle tracks, and soft tissue changes. Epidural air, the most frequent abnormal finding (82%), was observed in 41% of patients who underwent MRI within 3 days after injection. Abnormal findings due to an ESI were not observed in MR images acquired 4 days after ESI or later. Conclusions Pain physicians should consider the possibility of abnormal findings in MR images acquired after epidural injection using the interlaminar approach and the loss of resistance technique with air at the lumbar spine.
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- 2017
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4. A model on chemical looping combustion of methane in a bubbling fluidized-bed process
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Young-Wook Jeon, Jeong-Hoo Choi, Sang Done Kim, Djamila Brahimi, Pil Sang Youn, and Ho-Jung Ryu
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education.field_of_study ,General Chemical Engineering ,Population ,General Chemistry ,Combustion ,Methane ,Reaction rate ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Fluidized bed ,Particle ,Particle size ,education ,Chemical looping combustion - Abstract
We developed a mathematical model to discuss the performance of chemical looping combustion (CLC) of methane in continuous bubbling fluidized-beds. The model considers the particle population balance, oxidation and reduction rate of particles in fluidized beds. It also considers utilization efficiency of oxygen carrier (OC) particles, residence time of particles in each reactor, and particle size in reaction rate. The model was applied for a bubbling coreannulus fluidized-bed process. The core bed was the fuel reactor (0.08 m-i.d., 2.1 m-height) and the annulus bed was the air reactor (0.089 m-i.d., 0.15 m-o.d., 1.6 m-height). The process employed a type of Ni-based OC particles. The present model agrees reasonably well with the combustion efficiency measured in the process. Simulation was performed to investigate the effects of some variables for the process. The present model revealed that the range of circulation rate of OC particles for achieving complete combustion determined the operating range of the CLC system. The minimum circulation rate of OC particles for complete combustion decreased in the considered operating range as temperature or bed mass increased in the fuel reactor. A large mass of the fuel bed was necessary to obtain complete combustion at low fuel reactor temperature. The fresh feed rate of OC particles for steady state operation increased in complete combustion condition as temperature or static bed height or gas velocity increased.
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- 2012
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5. Effect of epidural corticosteroid injection on magnetic resonance imaging findings.
- Author
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Min Soo Kim, Tae Yoon Jeong, Yu Seon Cheong, Young Wook Jeon, So Young Lim, Seong Sik Kang, In Nam Kim, Tsong Bin Chang, Hyun Ho Seong, and Byeong Mun Hwang
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CORTICOSTEROIDS ,MAGNETIC resonance imaging - Abstract
Background: Magnetic resonance imaging (MRI) of the spine is the preferred diagnostic tool for pathologic conditions affecting the spine. However, in patients receiving epidural corticosteroid injection (ESI) for treatment of spinal diseases, there is a possibility of misreading of MR images because of air or fluid in the epidural space after the injection. Therefore, we defined the characteristics of abnormal changes in MRI findings following an ESI in patients with low back pain. Methods: We reviewed the medical records of 133 patients who underwent MRI of the lumbar spine within 7 days after ESI between 2006 and 2015.All patients were administered an ESI using a 22-gauge Tuohy needle at the lumbar spine through the interlaminar approach. The epidural space was identified by the loss of resistance technique with air. Results: The incidences of abnormal changes in MRI findings because of ESI were 54%, 31%, and 25% in patients who underwent MRI at approximately 24 h, and 2 and 3 days after ESI, respectively. Abnormal MRI findings included epidural air or fluid, needle tracks, and soft tissue changes. Epidural air, the most frequent abnormal finding (82%), was observed in 41% of patients who underwent MRI within 3 days after injection. Abnormal findings due to an ESI were not observed in MR images acquired 4 days after ESI or later. Conclusions: Pain physicians should consider the possibility of abnormal findings in MR images acquired after epidural injection using the interlaminar approach and the loss of resistance technique with air at the lumbar spine. [ABSTRACT FROM AUTHOR]
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- 2017
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6. Dynamic CT Perfusion Imaging for the Detection of Crossed Cerebellar Diaschisis in Acute Ischemic Stroke
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Ji Yong Lee, Kum Whang, Myung Soon Kim, Myeong Sub Lee, Seo Hyun Kim, Young Ju Kim, and Young Wook Jeon
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Male ,medicine.medical_specialty ,Neurology ,Iohexol ,Contrast Media ,Perfusion scanning ,Cerebellar Diseases ,Cerebellar hemisphere ,Humans ,Acute stroke ,Medicine ,heterocyclic compounds ,Radiology, Nuclear Medicine and imaging ,Acute ischemic stroke ,Aged ,Retrospective Studies ,urogenital system ,business.industry ,equipment and supplies ,Magnetic Resonance Imaging ,Cerebral Angiography ,Stroke ,Crossed cerebellar diaschisis ,Cerebral blood flow ,Cerebrovascular Circulation ,CT perfusion ,Radiographic Image Interpretation, Computer-Assisted ,Female ,Original Article ,Radiology ,Tomography, X-Ray Computed ,business ,Nuclear medicine ,Perfusion ,Blood Flow Velocity - Abstract
1Radiology, 2 Neurology, and 3 Objective: Although the detection of crossed cerebellar diaschisis (CCD) by means of different imaging modalities is well described, little is known about its diagnosis by computed tomography perfusion (CTP) imaging. We investigated the detection rate of CCD by CTP imaging and the factors related to CCD on CTP images in patients with acute ischemic stroke. Materials and Methods: CT perfusion maps of cerebral blood volume (CBV), cerebral blood flow (CBF), mean transit time (MTT), and time-to-peak (TTP) obtained from 81 consecutive patients affected by an acute ischemic stroke were retrospectively reviewed. Whole-brain perfusion maps were obtained with a multichannel CT scanner using the togglingtable technique. The criteria for CCD was a unilateral supratentorial ischemic lesion and an accompanying decrease in perfusion of the contralateral cerebellar hemisphere on the basis of CTP maps by visual inspection without a set threshold. Maps were quantitatively analyzed in CCD positive cases. Results: The criteria for CCD were fulfilled in 25 of the 81 cases (31%). Detection rates per CTP map were as follows: MTT (31%) > TTP (21%) > CBF (9%) > CBV (6%). Supratentorial ischemic volume, degree of perfusion reduction, and infratentorial asymmetry index correlated strongly (R, 0.555-0.870) and significantly ( p < 0.05) with each other in CCDpositive cases. Conclusion: It is possible to detect CCD on all four of the CTP-based maps. Of these maps, MTT is most sensitive in detecting CCD. Our data indicate that CTP imaging is a valid tool for the diagnosis of CCD in patients affected by an acute hemispheric stroke. Index terms: Crossed cerebellar diaschisis; Acute stroke; CT perfusion
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- 2012
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7. Microbiological Diversity and Prevalence of Spoilage and Pathogenic Bacteria in Commercial Fermented Alcoholic Beverages (Beer, Fruit Wine, Refined Rice Wine, and Yakju).
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SE HUI JEON, NAM HEE KIM, MOON BO SHIM, YOUNG WOOK JEON, JI HYE AHN, SOON HO LEE, IN GYUN HWANG, and MIN SUK RHEE
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MICROBIAL diversity ,BACTERIAL diversity ,BEER spoilage ,SPOILAGE of wine ,ESCHERICHIA coli - Abstract
The present study examined 469 commercially available fermented alcoholic beverages (FABs), including beer (draft, microbrewed, and pasteurized), fruit wine (grape and others), refined rice wine, and yakju (raw and pasteurized). Samples were screened for Escherichia coli and eight foodborne pathogens (Bacillus cereus, Campylobacter jejuni, Clostridium perfringens, Escherichia coli O157:H7, Listeria monocytogenes, Salmonella spp., Staphylococcus aureus, and Yersinia enterocolitica), and the aerobic plate count, lactic acid bacteria, acetic acid bacteria, fungi, and total coliforms were also enumerated. Microbrewed beer contained the highest number of microorganisms (average aerobic plate count, 3.5; lactic acid bacteria, 2.1; acetic acid bacteria, 2.0; and fungi, 3.6 log CFU/ml), followed by draft beer and yakju (P < 0.05), whereas the other FABs contained <25 CFU/25 ml microorganisms. Unexpectedly, neither microbial diversity nor microbial count correlated with the alcohol content (4.7 to 14.1%) or pH (3.4 to 4.2) of the product. Despite the harsh conditions, coliforms (detected in 23.8% of microbrewed beer samples) and B. cereus (detected in all FABs) were present in some products. B. cereus was detected most frequently in microbrewed beer (54.8% of samples) and nonpasteurized yakju (50.0%), followed by pasteurized yakju (28.8%), refined rice wine (25.0%), other fruit wines (12.3%), grape wine (8.6%), draft beer (5.6%), and pasteurized beer (2.2%) (P < 0.05). The finding that spore-forming B. cereus and coliform bacteria can survive the harsh conditions present in alcoholic beverages should be taken into account (alongside traditional quality indicators such as the presence of lactic acid-producing bacteria, acetic acid-producing bacteria, or both) when developing manufacturing systems and methods to prolong the shelf life of high-quality FAB products. New strategic quality management plans for various FABs are needed. [ABSTRACT FROM AUTHOR]
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- 2015
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8. 3D graphics system with VLIW processor for geometry acceleration.
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Young-Wook Jeon, Young-Su Kwon, Yeon-Ho Im, Jun-Hee Lee, Sang-Joon Nam, Byung-Woon Kim, and Chong-Min Kyung
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- 2000
- Full Text
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