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Search Results: 1 - 10 of 3063 matches for " Yoon Kwang "
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Three-level anterior cervical discectomy and fusion in elderly patients with wedge shaped tricortical autologous graft: A consecutive prospective series
Lee Suk,Oh Kwang,Yoon Kwang,Lee Sung
Indian Journal of Orthopaedics , 2008,
Abstract: Background: Treatment of multilevel cervical spondylotic myelopathy/radiculopathy is a matter of debate, more so in elderly patients due to compromised physiology. We evaluated the clinical and radiological results of cervical fusion, using wedge-shaped tricortical autologous iliac graft and Orion plate for three-level anterior cervical discectomy in elderly patients. Materials and Methods: Twelve elderly patients with mean age of 69.7 years (65-76 years) were treated between April 2000 and March 2005, for three-level anterior cervical discectomy and fusion, using wedge-shaped tricortical autologous iliac graft and Orion plate. Outcome was recorded clinically according to Odom′s criteria and radiologically in terms of correction of lordosis angle and intervertebral disc height span at the time of bony union. The mean follow-up was 29.8 months (12-58 months). Results: All the patients had a complete recovery of clinical symptoms after surgery. Postoperative score according to Odom′s criteria was excellent in six patients and good in remaining six. Bony union was achieved in all the patients with average union time of 12 weeks (8-20 weeks). The mean of sum of three segment graft height collapse was 2.50 mm (SD = 2.47). The average angle of lordosis was corrected from 18.2° (SD = 2.59°) preoperatively to 24.9° (SD = 4.54°) at the final follow-up. This improvement in the radiological findings is statistically significant (P < 0.05). Conclusion: Cervical fusion with wedge-shaped tricortical autologous iliac graft and Orion plate for three-level anterior cervical discectomy is an acceptable technique in elderly patients. It gives satisfactory results in terms of clinical outcome, predictable early solid bony union, and maintenance of disc space height along with restoration of cervical lordosis.
The Role of Compatibilizers on the Properties of PC/ABS Alloy  [PDF]
Hao Duan, Min-Qi Xin, Kwang-Yoon Kim, Jun-Jie Tang
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.56003
Abstract: Two compatibilizers consisting of styrene-acrylonitrile-glycidyl methacrylate (SAG) terpolymer with different contents of glycidyl methacrylate (GMA), SAG-001 (1 wt% of GMA) and SAG-005 (5 wt% of GMA), and styrene-acry-lonitrile-maleic anhydride terpolymer (SAM), SAM-002 (2 wt% of maleic anhydride ), were used to evaluate the role of compatibilizers in the PC/ABS alloy in terms of the mechanical properties, thermal stability and phase morphology. The tensile strength of SAG modified PC/ABS alloy slightly increased than that of SAM modified system, but the two compatibilizers barely affected the flexural strength of the system. On the other hand, the impact strength of SAG modified PC/ABS was improved. In addition, the MFR (melt flow index) of the SAG modified PC/ABS alloy reduced, implying that the viscosity or molecular weight of the system increased. The HDT (heat distortion temperature) also improved with SAG modified system. Moreover, the phase morphology of the SAG modified PC/ABS alloys much enhanced than that of SAM modified system. As a consequence, SAG compatibilized PC/ABS alloy showed better properties than those of SAM modified system, suggesting that the reaction between carboxylic or epoxy groups in SAG and terminal carboxyl group in PC would be the main factor to bring the enhancement in the mechanical, thermal and morphological properties of the PC/ABS alloy.
Effect of Residual Maleic Anhydride in PP-g-MAH on the Thermo-Oxidative Aging Properties of RGF-PP  [PDF]
Junjie Tang, Pengwei Shi, Hao Duan, Kwang-Yoon Kim, Minqi Xin
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.57008
Abstract: The mechanical, morphological and thermo-oxidative aging properties of the glass fiber reinforced polypropylene (RGF-PP) were studied based on four different maleic anhydride grafted polypropylene (PP-g-MAH) compatibilizers with different content of residual maleic anhydride (MAH). It was shown that PP-g-MAH compatibilizer could significantly improve the mechanical properties of RGF-PP, while from thermal and morphological analysis results, the content of residual MAH had negative influence on long term thermo- oxidative aging properties of RGF-PP with adding PP-g-MAH compatibilizer; the lower the residual content of MAH is, the better the thermo stability of the PP-g-MAH is, and also the better the thermo-oxidative aging properties was obtained.
Conceptualizing Professional Development in Mathematics: Elements of a Model (Conceptualización del Desarrollo Profesional en Matemáticas: Elementos de un Modelo)
Paola Sztajn,Matthew P. Campbell,Kwang S. Yoon
PNA , 2011,
Abstract: This theoretical paper discusses the concept of models for mathematics professional development. After examining the related literature, we propose a definition of this concept that includes four elements: goals, theories, contexts, and structure. We present aspects of professional development that comprise each element. En este artículo teórico discutimos sobre el concepto de modelos para el desarrollo profesional en matemáticas. Después de examinar la literatura relacionada, proponemos una definición de este concepto que incluye cuatro elementos: metas, teorías, contextos y estructura. Presentamos los aspectos del desarrollo profesional que abarca cada elemento.
Gastric angiodysplasia in a hereditary hemorrhagic telangiectasia type 2 patient
Minsu Ha,Yoon Jae Kim,Kwang An Kwon,Ki Baik Hahm
World Journal of Gastroenterology , 2012, DOI: 10.3748/wjg.v18.i15.1840
Abstract: Hereditary hemorrhagic telangiectasia (HHT) is a rare autosomal-dominantly inherited disease that occurs in approximately one in 5000 to 8000 people. Clinical diagnosis of HHT is made when a person presents three of the following four criteria: family history, recurrent nosebleeds, mucocutaneous telangiectasis, and arteriovenous malformations (AVM) in the brain, lung, liver and gastrointestinal (GI) tract. Although epistaxis is the most common presenting symptom, AVMs affecting the lungs, brain and GI tract provoke a more serious outcome. Heterozygous mutations in endoglin, activin receptor-like kinase 1 (ACVRL1; ALK1), and SMAD4, the genes involved in the transforming growth factor-β family signaling cascade, cause HHT. We report here the case of a 63 year-old male patient who presented melena and GI bleeding episodes, proven to be caused by bleeding from multiple gastric angiodysplasia. Esophagogastroduodenoscopy revealed multiple angiodysplasia throughout the stomach. Endoscopic argon plasma coagulation was performed to control bleeding from a gastric angiodysplasia. The patient has been admitted several times with episodes of hemoptysis and hematochezia. One year ago, the patient was hospitalized due to right-sided weakness, which was caused by left basal ganglia hemorrhage as the part of HHT presentation. In family history, the patient’s mother and elder sister had died, due to intracranial hemorrhage, and his eldest son has been suffered from recurrent epistaxis for 20 years. A genetic study revealed a mutation in exon 3 of ALK1 (c.199C > T; p.Arg67Trp) in the proband and his eldest son presenting epistaxis.
Reconstruction of the Head and Neck Region Using Lower Trapezius Musculocutaneous Flaps
Soo Kwang Yoon,Seung Han Song,Nakheon Kang,Yeo-Hoon Yoon
Archives of Plastic Surgery , 2012, DOI: http://dx.doi.org/10.5999/aps.2012.39.6.626
Abstract: Background Recent literature has indicated that free flaps are currently considered thepreferred choice for head and neck reconstruction. However, head and neck cancer patients arefrequently treated with chemoradiotherapy, which is often associated with a poor general andlocal condition, and thus, such patients are ineligible for free flap reconstruction. Therefore,other reconstruction modalities should be considered.Methods We used lower trapezius musculocutaneous (LTMC) flap based on the dorsal scapularartery to reconstruct head and neck defects that arose from head and neck cancer in 8 patients.All of the patients had undergone preoperative chemoradiotherapy.Results There were no complications except one case of partial flap necrosis; it was treatedwith secondary intention. Healing in the remaining patients was uneventful without hematoma,seroma, or infection. The donor sites were closed primarily.Conclusions The LTMC flap is the preferred flap for a simple, reliable, large flap with a widearc of rotation and minor donor-site morbidity. The authors recommend this versatile islandflap as an alternative to microvascular free tissue transfer for the reconstruction of defects inthe head and neck region, for patients that have undergone preoperative chemoradiotherapy.
Acidic pH shock induces the expressions of a wide range of stress-response genes
Yoon Kim, Myung Moon, Jae Song, Colin P Smith, Soon-Kwang Hong, Yong Chang
BMC Genomics , 2008, DOI: 10.1186/1471-2164-9-604
Abstract: According to the results of transcriptional and proteomic analyses, the major number of sigma factor genes were upregulated by an acidic pH shock. Well-studied sigma factor genes of sigH (heat shock), sigR (oxidative stress), sigB (osmotic shock), and hrdD that play a major role in the secondary metabolism, were all strongly upregulated by the pH shock. A number of heat shock proteins including the DnaK family and chaperones such as GroEL2 were also observed to be upregulated by the pH shock, while their repressor of hspR was strongly downregulated. Oxidative stress-related proteins such as thioredoxin, catalase, superoxide dismutase, peroxidase, and osmotic shock-related protein such as vesicle synthases were also upregulated in overall.From these observations, an acidic pH shock was considered to be one of the strongest stresses to influence a wide range of sigma factors and shock-related proteins including general stress response proteins. The upregulation of the sigma factors and shock proteins already found to be related to actinorhodin biosynthesis was considered to have contributed to enhanced actinorhodin productivity by mediating the pH shock signal to regulators or biosynthesis genes for actinorhodin production.Various environmental signals are known to enhance secondary metabolites production in Streptomycetes by initiating complex signal transduction system [1]. There have been a number of studies on the application of an environmental stimulus for the enhancement of productivity. These environmental stimuli include heat shock, cold shock, oxidative stress, osmotic stress, acidic sock, alkali shock [2-6].It is known that different sigma factors respond to different types of stresses, respectively in Streptomyces strains, which have a number of unique signal transduction mechanisms depending on the types of environmental shock [1]. Those sigma factors coordinate gene expression in response to various environmental and endogenous signals.A research group h
Community changes in carabid beetles (Coleoptera: Carabidae) through ecological succession in abandoned paddy fields
Yuno Do,Kwang-Seuk Jeong,Maurice Lineman,Ji Yoon Kim
Journal of Ecology and Field Biology , 2011,
Abstract: Carabid beetle community changes in paddy fields, abandoned paddy fields, and mountains were investigated to understanddifferences in species diversity and composition of different habitat types in small agricultural landscapes inSouth Korea. A total of 2,938 individuals from 37 species were identified and classified from the studied habitats. Diversityin the mountains was higher than that in abandoned paddy fields. As the number of years since abandonmentincreased, the diversity and stability of the carabid beetle community also increased. Abandoned paddy fields in somepaddy field areas and adjoining mountainous areas, left with preconditions for management and control, have providedthe opportunity to improve the diversity and habitat of small agricultural landscapes. Species composition changedcontinuously from the paddy fields to the mountains, in accordance with individual species habitat preferences. Abandonedpaddy fields in small agricultural landscapes are believed to play an important role as transitional buffer zonesbetween paddy fields and the adjacent mountainous areas.
One stage resection of spontaneous rupture of hepatocellular carcinoma in the triangular ligament with diaphragm invasion: case report and review of the literature
Park Kwang-Kuk,Yang Song-I,Yoon Myung-hee
World Journal of Emergency Surgery , 2012, DOI: 10.1186/1749-7922-7-30
Abstract: A spontaneous rupture of hepatocellular carcinoma (HCC) can lead to extensive hemorrhage and is a rare but life-threatening event. A 58-year-old male patient with no history of trauma presented at our institution with severe epigastric pain and abdominal distension for 6 h. His blood pressure was a 60/40 mmHg, and pulse rate was 132/min. Abdominal contrast enhanced computed tomography (CT) imaging revealed a ruptured mass under the left diaphragm and fluid collection in the upper abdomen, flanks and pelvic cavity. Exploratory laparotomy confirmed the presence of an active bleeding tumor in the triangular ligament invading into the diaphragm. The tumor was resected with an appropriate diaphragm margin. The resected tumor was 5 cm in diameter and pathologically identified as hepatocellular carcinoma with a negative surgical margin. This case report shows that ruptured hepatocellular carcinoma should be considered in the differential diagnosis of non-traumatic hemoperitoneum. And it is necessary to set a surgical plan for unpredictable HCC rupture with direct diaphragm invasion.
A mutation of HEXB gene in Sandhoff disease presenting as motor neuron disease
Ahn Suk-Won,Kim Su-Hyun,Hong Yoon-Ho,Lee Kwang-Woo
Neurology India , 2010,
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