EFFECT OF POROSITY ON THE TRANSIENT MHD GENERALIZED COUETTE FLOW WITH HEAT TRANSFER IN THE PRESENCE OF HEAT SOURCE AND UNIFORM SUCTION AND INJECTION

HAZEM ALI ATTIA,KAREM MAHMOUD EWIS,NABIL AHMED AWAD-ALLAH 한국산업응용수학회 2012 Journal of the Korean Society for Industrial and A Vol.16 No.2

The transient magnetohydrodynamic (MHD) generalized Couette flow with heat transfer through a porous medium of an electrically conducting, viscous, incompressible fluid bounded by two parallel insulating porous plates is studied in the presence of uniform suction and injection and a heat source considering the Hall effect. A uniform and constant pressure gradient is imposed in the axial direction and an externally applied uniform magnetic field as well as a uniform suction and injection are applied in the direction perpendicular to the plates. The two plates are kept at different but constant temperatures while the Joule and viscous dissipations are included in the energy equation. The effect of the Hall current, the porosity of the medium and the uniform suction and injection on both the velocity and temperature distributions is investigated.

HYDROMAGNETIC ROTATING DISK FLOW OF A NON-NEWTONIAN FLUID WITH HEAT TRANSFER AND OHMIC HEATING

Hazem A. Attia,Karem M. Ewis,Ibrahim H.Abd Elmaksoud,Nabil A.Awad-Allah 한국산업응용수학회 2012 Journal of the Korean Society for Industrial and A Vol.16 No.3

The steady hydromagnetic flow of an electrically conducting non-Newtonian fluid due to the rotation of an infinite disk is studied with heat transfer with the inclusion of the ion slip as well as Ohmic heating. The governing nonlinear momentum equations and energy equations are solved using the finite difference method. The numerical results indicate the important effect of the ion slip and the non-Newtonian fluid characteristics on the velocity and temperature distributions.

Research Articles : Induction of Systemic Resistance of Benzothiadiazole and Humic Acid in Soybean Plants Against Fusarium Wilt Disease

( Montaser Fawzy Abdel Monaim ),( Mamdoh Ewis Ismail ),( Kadry Mohamed Morsy ) 한국균학회 2011 Mycobiology Vol.39 No.4

The ability of benzothiadiazole (BTH) and/or humic acid (HA) used as seed soaking to induce systemic resistance against a pathogenic strain of Fusarium oxysporum was examined in four soybean cultivars under greenhouse conditions. Alone and in combination the inducers were able to protect soybean plants against damping-off and wilt diseases compared with check treatment. These results were confirmed under field conditions in two different locations (Minia and New Valley governorates). The tested treatments significantly reduced damping-off and wilt diseases and increased growth parameters, except the number of branches per plant and also increased seed yield. Application of BTH (0.25 g/L)+HA (4 g/L) was the most potent in this respect. Soybean seed soaking in BTH+HA produced the highest activities of the testes of oxidative enzymes followed by BTH in the four soybean cultivars. HA treatment resulted in the lowest increases of these oxidative enzymes. Similar results were obtained with total phenol but HA increased total phenol more than did BTH in all tested cultivars.

An Epidemiological Study of Cutaneous Leishmaniasis in Al-Jabal Al-Gharbi, Libya

Manal Z. M. Abdellatif,Khamis El-Mabrouk,Ashraf A. Ewis 대한기생충학열대의학회 2013 The Korean Journal of Parasitology Vol.51 No.1

고도 성인 흉부 측만증에서 시행한 후방 척주절제술

정의룡,김진혁,이상민 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective : To report the result of one stage posterior vertebral column resection(PVCR) in treating severe adult thoracic scoliosis Materials and Methods : Thirteen patients(average age 30.2 years) with thoracic scoliosis were treated with PVCR. Their results were retrospectively reviewed after a minimum follow-up of 2 years for deformity correction and complications. Etiological diagnoses were neglected idiopathic in 6, congenital in 4 and others in 3. The average preoperative scoliosis was 96°(range: 70∼143) with less than 25% flexibility. The average preoperative trunk shift was 2.Ocm(range: O∼6.0) and the shoulder height difference was 2.1 cm(range: O∼8.0). The procedure consisted of a posterior midline approach, segmental pedicle screw fixation of the index curve, resection of the posterior elements, bilateral rib heads and vertebral bodies with adjacent discs, anterior column reconstruction with a structural graft or chip bones, and correction of the deformity by derotation and cantilever method. Results : Total 17 thoracic vertebrae were resected. The most common resection was T8 in 5 patients. The mean operative time was 387 minutes with an average blood loss of 4864 ml. At latest follow up, the index curve was corrected to 36(range: 15∼78) showing a correction of 63%. The loss of correction was 4%. The trunk shift and the shoulder height difference were improved to 0.4cm(range: O∼1.4) and 0.4cm (range: O∼1.0), respectively. One paraplegia occurred in scoliosis with Beal's syndrome, who had a preoperative neurologic deficit. Conclusion: One stage posterior vertebral column resection could be performed safely and effectively for severe adult thoracic scoliosis, even though technically demanding and involves possible risk for major complications.

후방 도달 척추 절제술을 이용한 강직성 요천추 변형의 치료

석세일,정의룡,이정희,김진혁,김성수,이지호,최원기,박용원 대한척추외과학회 2004 대한척추외과학회지 Vol.11 No.2

분절간 척추경 나사 고정과 척추전이법을 이용한 특발성 척추 측만증의 치료

석세일,김진혁,이상민,정의룡,김성수,이정희,박준석 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.2

Objective : To report the clinical result of segmental pedicle screw fixation and translation technique in surgical correction of idiopathic scoliosis. Methods and materials : Ten idiopathic scoliosis. patients treated with segmental pedicle screw fixation and translation technique were analyzed retrospectively. The mean follow-up interval was 23.8months, with a minimum of 12 months. Eighteen structural curves were fused in one double curves(King type Ⅰ), seven double thoracic curve(King type Ⅴ) and two thoracolumbar curve. Deformity correction, apical vertebral rotation(AVR), apical vertebral translation(AVT), trunk balance, shoulder balance and complications were evaluated. Result : The structural curve was corrected from 47.4±10.6° to 20.3±5.9° at 1week after surgery and 55.6±14.1° at latest follow-up. AVR was corrected from 2.06±0.4 to 0.94±0.41 at 1week after surgery and latest follow-up. AVT was improved from 25±15.7㎜ to 11.5±7.3㎜ at 1week after surgery and 12.3±7.3㎜ at latest follow-up. There were no trunk imbalance(less than 10㎜ distance from C7 plumb line), no shoulder imbalance(less than 10㎜ shoulder height difference) and no screw related complications. Conclusions : The segmental pedicle screw fixation and translation technique is an effective method in treating for idiopathic scoliosis.

후방 도달 반척추 절제술을 이용한 선천성 측만증의 치료

김진혁,이상민,정의룡 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objectives: To evaluate the surgical outcomes of congenital scoliosis with hemivertebra corrected by posterior vertebral column resection after a minimum follow up of 2years. Materials & Methods: Thirty five congenital scoliosis cases(20 males and 15 females) subjected to posterior vertebral column resection and without any previous operative intervention were analyzed. They were analyzed for deformity correction and complications. The mean age at operation was 14.6 year-old(range 2.6~35) and mean follow-up was 3.1 years(range 2.0~4.5). The preoperative index curve was 44.5±15.8° in coronal plane, and 22.7±35.9° in sagittal plane. Results: The total number of resected vertebrae were 36 : 17 in thoracic and 19 in lumbar. The deformity correction was 57.0% with 19.0±10.6° in the coronal plane and 69.0% with 7.0±14.9° in the sagittal plane. Mean operation time was 222.7±54.9 minutes with a total perioerative transfusion of 1992.0 ㎖. Complications were encountered in 3 patients(8.6%) : 1 hematoma and cauda equina syndrome, 1 fixation failures and 1 transient posterior cord syndrome. Conclusion: Posterior vertebral column resection in congenital scoliosis with hemivertebra is an effective method compared to anterior-posterior two stage hemivertebra resection. It could offer satisfactory correction of deformity and restoration of spinal balance.

심한 척추변형(측만증 및 후만증)에 대한 척추 후방 절제술

석세일,김진혁,이상민,정의룡,이정희,김성수,정락용 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.1S

■ Purpose To report a technique of vertebral column resection through a single posterior approach and its first results in the treatment of severe spinal deformities. ■ Methods and materials Seventy spinal deformity patients treated by posterior vertebral column resection(PVCR) were reviewed. Minimum follow up was 2 years (2 - 3.3 years). There were 34 males and 36 females with a mean age of 27.4 years at the time of the operation. Etiologic diagnoses were adult scoliosis in 7, congenital kyphoscoliosis in 38, and post-infectious kyphosis in 25. The surgery consisted of temporary stabilization of the vertebral column with segmental pedicle screw fixation, resection of the vertebral column at the apex of the deformity via the posterior route followed by gradual deformity correction and global fusion. ■ Results The total number of resected vertebrae were 143; 76 in thoracic and 67 in lumbar. Mean operation time was 4 hours 31 minutes with average blood loss of 2333 ml. The deformity correction was 40o in the coronal plane and 5Oo in the sagiotal plane. Complications were encountered in 24 patients: 2 complete cord injuries in severe adult scoliosis and thoracic kyphosis patient who had significant preoperative cord compromise, 6 hematomas, 4 root injuries (all incomplete), 5 fixation failures, 2 infections and 5 hemopneumothoraxes. ■ Conclusions PVCR is an effective alternative for severe fixed spinal deformities. However, extreme caution must be taken in the patients with preoperative cord compromise who are the high risk of neurological complications.

퇴행성 요추 병변에서 척추경 나사를 이용한 요천추유합의 결과

김진혁,이상민,정의룡 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.5

Objective: To evaluate the efficacy of lumbosacral fusion with bilateral bicortical S1 pedicle screw fixation without anterior support on the basis of the fusion levels in degenerative lumbosacral disease. Materials and Methods: Seventy three patients were treated with posterior decompression and posterolateral fusion with bilateral bicortical S1 pedicle screw fixation. Their results were analyzed retrospectively with minimum 2-year follow-up. Postoperative anteroposterior and lateral radiographs were analyzed for S1 screw loosening, fixation failure and lumbosacral fusion. Medical records were analyzed for postoperative low back pain and complications. Results: S1 screw loosening was 1(6.3%) in 2 level fixations, 3(14.3%) in 3 levels, 7(5O.0%) in 4 levels and 13(86.7%) in more than 5 levels. Fixation failure was 1(4.8%) in 3 levels fixation, 1(7.1%) in 4 levels, 5(33.3%) in more than 5 levels. Non-union was suspected in 30 patients(41.1%), 1(14.3%) in mono-level fixation, 2(12.5%) in 2 levels, 8(38%) in 3 levels, 9(64%) in 4 levels and 10(67%) in more than 5 levels. Postoperative sustained low back pain was 1 in 3 levels fixation, 2 in 4 levels and 7 in more than 5 levels. Postoperative complications were detected in more than 3 level fixations ; hematoma in 2, wound infection in 6, progressive kyphosis in 2. Conclusion: Lumbosacral fixation with bilateral bicortical S1 pedicle screw could not provide satisfactory outcome in long level fusion especially in more than 4 levels fusion of degenerative lumbar disease.