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Search Results: 1 - 10 of 6540 matches for " Seung Hyun Hwang "
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Medial Patella Subluxation after Minor Trauma  [PDF]
Seung Hyun Hwang, Chang Hyun Nam, Kyung Won Choi, Hye Sun Ahn
Open Journal of Orthopedics (OJO) , 2017, DOI: 10.4236/ojo.2017.710029
Abstract: Most cases of medial patella subluxation occur under iatrogenic conditions that are often associated with a prior excessive lateral retinacular release procedure. We report a case of medial subluxation following minor trauma with no history of previous lateral release. The abnormality was identified on magnetic resonance imaging and was successfully treated by direct repair of the lateral retinaculum. The recognition and treatment of medial subluxation of the patella without retinacular release can be difficult. Therefore, consideration of multiple causes through careful medical history taking, physical examination, and radiologic examination is needed for accurate diagnosis.
Mucoid Degeneration of Posterior Cruciate Ligament Leads to Roof Impingement with Anterior Cruciate Ligament: Case Report  [PDF]
Su Chan Lee, Kyung Won Choi, Chang Hyun Nam, Seung Hyun Hwang, Hye Sun Ahn
Open Journal of Orthopedics (OJO) , 2018, DOI: 10.4236/ojo.2018.82006
Abstract: Mucoid degeneration of cruciate ligament is rare cause of knee pain, however there are some cases causing pain and restriction of extension. A 60-year-old man came to our clinic complaining of pain in knee joint on full range of extension about 3 months ago. The range of motion (ROM) was a flexion contracture of 5 degree and a further flexion of 140 degree with pain aggravation by forced extension. Magnetic resonance imaging of the knee joint showed thickened posterior cruciate ligament (PCL) mucoid degeneration. Arthroscopic treatment consists of PCL reduction-plasty by debridement of yellowish material in the PCL fiber and reduces the volume of the hypertrophied PCL. Immediately after surgery, patient gain the full ROM without any symptom of impingement. Enlarged PCL can make impingement in femoral notch with anterior cruciate ligament (ACL). Then, Partial debulking surgery of PCL is an effective treatment to pain relief and restore ROM of knee.
Comparison of Clinical Results in Deep Vein Thrombosis of Total Knee Arthroplasty with Rivaroxaban and Dalteparin Sodium  [PDF]
Su Chan Lee, Chang Hyun Nam, Hye Sun Ahn, Seung Hyun Hwang, Nong Kyum Ahn, Ha Young Park
Open Journal of Orthopedics (OJO) , 2015, DOI: 10.4236/ojo.2015.52003
Abstract: This study was intended to investigate into the incidence rates of deep vein thrombosis (DVT) in patients who used prophylactic antithrombotic medications after total knee arthroplasty (TKA), and to compare clinical results in groups treated with Rivaroxaban versus Dalteparin sodium as prophylactic antithrombotic medications. This prospective study was performed in 300 patients who underwent TKA between November 2011 and December 2012. The prophylactic therapy was given to 150 patients in Rivaroxaban group and Dalteparin sodium group, respectively. In addition, intermittent compression pump and stocking were used in all the groups immediately after TKA. In order to determine the incidence of DVT, color Doppler ultrasonography, D-dimer, and clinical symptom examination were conducted. There were 17 cases (11.3%) of DVT in Rivaroxaban group and 18 cases (12.0%) of DVT in Dalteparin sodium group after TKA, and no significant difference was seen between both groups. Between patients with DVT and those without DVT after TKA at 4 days in both groups, there was a significant difference in the swelling indices. Moreover, a significant difference was observed in the evaluation of bruise. The early signs of DVT after TKA are unknown, however, some initial clinical signs such as swelling have been observed. After using the said prophylactic drugs, the lower incidence of DVT was seen, and there was no difference between the types of drugs. Pharmacological therapy (either Rivaroxaban or Dalteparin sodium) after TKA is considered effective for DVT prevention. There is also a need to consider constant monitoring of clinical symptoms.
Treatment of Bone Defect with Modular Metal Augmentation Using a Downsized Block in Total Knee Arthroplasty: Technical Note and Report of 17 Cases  [PDF]
Su Chan Lee, Chang Hyun Nam, Seung Hyun Hwang, Ji-Hoon Baek, Soon Yong Yoo, Hye Sun Ahn
Open Journal of Orthopedics (OJO) , 2016, DOI: 10.4236/ojo.2016.69035
Abstract: In total knee arthroplasty (TKA), a treatment of bone defect varies depending on the location and extent of defect and requires proper surgical procedure. Metal augmentation is readily available for both femoral and tibial bone defects. We report the operative technique of modular metal augmentation using a downsized block for ambiguous proximal tibial and distal femoral bone defects in primary and revision TKA. Regarding bone defects, bone loss can be minimized by using a different size of metal augmentation, and suitable reinforcement for bone defects can be achieved. Once our technique is properly used, it will be very helpful in treating bone defects.
Relationship Between Atmospheric Conditions and Breeding Ecology of Tits in Artificial Nest Boxes
Seung-Hun Son,Kyu-Jung Kim,Hyun-Su Hwang,Shin-Jae Rhim
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.3682.3686
Abstract: This study was conducted to investigate the relationship between atmospheric conditions and breeding ecology of Parus sp. tits in artificial nest boxes at a deciduous forest between March 2009 and July 2010. In order to collect data regarding tit breeding, temperature and relative humidity, researchers installed a total of 45 artificial nest boxes equipped with Hobo Pro V2 monitors. Artificial nest boxes had one of three different entrance diameters of 30, 35 and 40 mm. The mean temperature and relative humidity in 2010 were lower than in 2009. Marsh and great tits both had differences in incubation and nestling care periods based on temperature and relative humidity during the breeding season. In addition, increases in the body weight and tarsus length of juvenile tits were slower in 2010 than in 2009. To understand whether the breeding ecology of tits is affected by atmospheric conditions, further long-term ecological research is needed.
Effect of Forest Road on Stand Structure and Small Mammals in Temperate Forests
Shin-Jae Rhim,Kyu-Jung Kim,Seung-Hun Son,Hyun-Su Hwang
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.2540.2547
Abstract: Researchers examined changes in habitat structure and abundance of three small mammal species, Korean field mice (Apodemus peninsulae), Korean red-backed voles (Myodes regulus) and striped field mice (A. agrarius) between 1st year (the 1st trapping session in 2005) and 4th year (the 2nd trappings session in 2008) after forest road construction within deciduous and coniferous stands in Jincheon, Chungbuk province, South Korea. Forest structure differed significantly between forest edge and interior areas in both stands. Number of standing wood, basal area, coverage of understory vegetation and volume of coarse woody debris were higher in deciduous than in coniferous stands. Researchers captured 5 species of small animals, 1196 times in 4 sites during the 2 trapping sessions. The abundances of the three small mammals varied according to the habitat, generally higher in deciduous stands than in coniferous stands and higher in interior areas than in edge areas. In the 2nd trapping session, the abundance of A. peninsulae and M. regulus had increased and that of A. agrarius had decreased in the forest edge compared with the 1st trapping session. Understory vegetation and woody seedlings were the habitat components most strongly related to small mammal abundance at the edge of forest road. Long-term experiments are needed to elucidate the potential effects of forest road on small mammal species.
Hydrochemistry for the Assessment of Groundwater Quality in Korea  [PDF]
Jong Yeon Hwang, Sunhwa Park, Hyun-Koo Kim, Moon-Su Kim, Hun-Je Jo, Ji-In Kim, Gyeong-Mi Lee, In-Kyu Shin, Tae-Seung Kim
Journal of Agricultural Chemistry and Environment (JACEN) , 2017, DOI: 10.4236/jacen.2017.61001
Abstract: Understanding of the aquifer hydraulic properties and hydrochemical characteristics of water is crucial for management plan and study skims in the target area, and flow motions and chemical species of groundwater are regarded as precious information on the geological history of the aquifers and the suitability of various usages. Cations and anions of groundwater are used to estimate the characteristics and origin of groundwater. In this study, we try to evaluate the quality of groundwater based on the comparison of the physiochemical characteristics and distribution of cations and anions in groundwater from rural areas. Therefore we focused on the evaluation of groundwater as some specific purposes such as agricultural and industrial use, general types of groundwater, lithological origin of chemical component in groundwater. In this point of view, major objectives of this study were grouped as following three categories: 1) quality assessment of groundwater as a special usage (agricultural, industrial); 2) determination of groundwater types; 3) tracing of ion sources of groundwater. The quality of agricultural water was evaluated using SAR, sodium (%), RSC, PI, SSP, MH, PS, and Kelly’s ratio, and was classified as SAR (Excellent (100%)), Sodium ((Excellent (34%), Good (55%), Permissible (9%), Doubtful (1.6%), Unsuitable (0.4%)), RSC (Good (95.7%), Medium (3.5%), Bad (0.8%)), PI((Excellent (40.6%), Good (59%), Unsuitable (0.4%)), SSP ((Excellent (26.3%), Good (59.8%), Fair (13.1%), Poor (0.8%)), MH ((Acceptable (94.4%), Non-Acceptable (5.6%)), Kelly’s Ratio ((Permissible (93%), Non-Permissible (7%)), PS ((Excellent to Good (98%), Good to Injurious (1.2%), and Injurious to Unsatisfactory (0.2%)). Evaluation based on the Wilcox diagram was classified as “excellent to good” or “good to permissible”, and the water quality evaluated using the U.S. salinity Laboratory’s Diagram was classified as C1S1 (Excellent/Excellent) and C2S1 (Good/Excellent). And, in the applications of two factors of Langelier Saturation Index (LSI) and Corrosive ratio (CR), we could get similar results for defining the suitabilities of groundwater for the industrial purpose. And the groundwater samples were also classified groundwater using the Piper diagram and estimated the origin of ions using the Gibbs and Chadah diagram, and the classifications based on the Piper diagram showed that the types of the groundwater are \"\" type?and \"\" type. And,
Isolation of Betulinic Acid, its Methyl Ester and Guaiane Sesquiterpenoids with Protein Tyrosine Phosphatase 1B Inhibitory Activity from the Roots of Saussurea lappa C.B.Clarke
Ji Young Choi,MinKyun Na,In Hyun Hwang,Seung Ho Lee,Eun Young Bae,Bo Yeon Kim,Jong Seog Ahn
Molecules , 2009, DOI: 10.3390/molecules14010266
Abstract: Activity-guided fractionation of a MeOH extract of the roots of Saussurea lappa C.B.Clarke (Compositae), using an in vitro protein tyrosine phosphatase 1B (PTP1B) inhibition assay, led to the isolation of four active constituents: betulinic acid (1), betulinic acid methyl ester (2), mokko lactone (3) and dehydrocostuslactone (4), along with nine inactive compounds. Our findings indicate that betulinic acid (1) and its methyl ester 2, as well as the two guaiane sesquiterpenoids 3 and 4 are potential lead moieties for the development of new PTP1B inhibitors.
Neuroprotective Effects of Herbal Ethanol Extracts from Gynostemma pentaphyllum in the 6-Hydroxydopamine-Lesioned Rat Model of Parkinson's Disease
Hyun Sook Choi,Mi Sook Park,Seung Hwan Kim,Bang Yeon Hwang,Chong Kil Lee,Myung Koo Lee
Molecules , 2010, DOI: 10.3390/molecules15042814
Abstract: 6-Hydroxydopamine administration for 28 days (8 μg/2 μL) reduced the number of tyrosine hydroxylase (TH)-immunopositive neurons to 40.2% in the substantia nigra compared to the intact contralateral side. Dopamine, 3,4-dihydroxyphenylacetic acid, homovanillic acid and norepinephrine levels were reduced to 19.1%, 52.3%, 47.1% and 67.4% in the striatum of 6-hydroxydopamine-lesioned rats compared to the control group, respectively. However, an oral administration of herbal ethanol extracts from Gynostemma pentaphyllum (GP-EX) (10 mg/kg and 30 mg/kg) starting on day 3 post-lesion for 28 days markedly ameliorated the reduction of TH-immunopositive neurons induced by 6-hydroxydopamine-lesioned rat brain from 40.2% to 67.4% and 75.8% in the substantia nigra. GP-EX administration (10 and 30 mg/kg) also recovered the levels of dopamine, 3,4-dihydroxyphenylacetic acid, homovanillic acid and norepinephrine in post-lesion striatum to 64.1% and 65.0%, 77.9% and 89.7%, 82.6% and 90.2%, and 88.1% and 89.2% of the control group. GP-EX at the given doses did not produce any sign of toxicity such as weight loss, diarrhea and vomiting in rats during the 28 day treatment period and four gypenoside derivatives, gynosaponin TN-1, gynosaponin TN-2, gypenoside XLV and gypenoside LXXIV were identified from GP-EX. These results suggest that GP-EX might be helpful in the prevention of Parkinson’s disease.
Bird Community Characteristics During the Rainy and Dry Seasons in Lowland Dry Evergreen Forests of the Central Cardamom Protected Forest and the Seima Biodiversity Conservation Area in Cambodia
Shin-Jae Rhim,Seung-Hun Son,Kyu-Jung Kim,Hyun-Su Hwang,Woo-Shin Lee
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.4476.4481
Abstract: The goal of this study was to gain a greater understanding of the characteristics of bird communities during the rainy and dry seasons in lowland dry evergreen forests of the Central Cardamom Protected Forest and the Seima Biodiversity Conservation Area in Cambodia during July 2007 and December 2011. The 82 bird species were observed in the Central Cardamom Protected Forest and 72 bird species were observed in the Seima Biodiversity Conservation Area. The number of species and individuals were similar between rainy and dry seasons in both study areas. IUCN (International Union for Conservation of Nature) red list and CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) listed species such as the green peafowl (Pavo muticus), the Oriental pied hornbill (Anthracoceros albirostris), the great hornbill (Buceros bicornis) and the crested serpent eagle (Spilornis cheela) were recorded in this study. The primary threats to bird communities in and around both study areas were related to habitat conversion and poaching for local consumption. Habitat conversion and poaching should be strictly prohibited to conserve bird communities. Moreover, detailed management programs based on scientific research will be helpful for conservation of biodiversity.
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