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Uduak-Obong I. Ekanem,Łukasz Olewnik,Andrea Porzionato,Veronica Macchi,Joe Iwanaga,Marios Loukas,Aaron S. Dumont,Raffaele De Caro,R. Shane Tubbs 대한해부학회 2022 Anatomy & Cell Biology Vol.55 No.2
Although adequate venous drainage from the cranium is imperative for maintaining normal intracranial pressure, the bony anatomy surrounding the inferior petrosal sinus and the potential for a compressive canal or tunnel has, to our knowledge, not been previously investigated. One hundred adult human skulls (200 sides) were observed and documented for the presence or absence of an inferior petrosal groove or canal. Measurements were made and a classification developed to help better understand their anatomy and discuss it in future reports. We identified an inferior petrosal sinus groove (IPSG) in the majority of specimens. The IPSG began anteriorly where the apex of the petrous part of the temporal bone articulated with the sphenoid part of the clivus, traveled posteriorly, in a slight medial to lateral course, primarily just medial to the petro-occipital fissure, and ended at the anteromedial aspect of the jugular foramen. When the IPSGs were grouped into five types. In type I specimens, no IPSG was identified (10.0%), in type II specimens, a partial IPSG was identified (6.5%), in type III specimens, a complete IPSG (80.0%) was identified, in type IV specimens, a partial IPS tunnel was identified (2.5%), and in type V specimens, a complete tunnel (1.0%) was identified. An improved knowledge of the bony pathways that the intracranial dural venous sinuses take as they exit the cranium is clinically useful. Radiological interpretation of such bony landmarks might improve patient diagnoses and surgically, such anatomy could decrease patient morbidity during approaches to the posterior cranial fossa.
Hilary P. Obong,Akpan N. Ikot,I. O. Owate,H. Hassanabadi 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.6
In this paper, we study the Dirac equation with a multiparameter exponential-type potentialincluding two tensor interactions. We obtain the energy eigenvalues by using the Nikiforov-Uvarovmethod. The corresponding wave functions are obtained and expressed in terms of hypergeometricfunctions. The effects of the Coulomb and the Yukawa tensor interactions are also investigatednumerically and discussed in detail.
Relativistic Symmetries in the Dirac Equation for an Eight-parameter Exponential-type Potential
H. P. OBONG,Akpan Ndem IKOT,I. O. OWATE,Hassan HASSANABADI 한국물리학회 2016 새물리 Vol.66 No.2
Applying the Pekeris approximation to the centrifugal term, we investigated the spin and pseudospin symmetric solutions of the Dirac equation for $an$ eight-parameter exponential-type potential with a Coulomb-like tensor interaction. The energy eigenvalue equation and the corresponding eigenfunction are obtained using the Nikiforov-Uvarov (NU) method. The effects of the Coulomb tensor interaction are investigated numerically.
임민산(MinSan Im),권오봉(OBong Gwun),송주환(Juwhan Song) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
컴퓨터 그래픽스 분야의 발전으로 3D 모델의 수가 기하급수적으로 늘고 있다. 기존의 텍스트나 2D 이미지만을 검색하는 시스템으로는 정확한 3D 모델의 검색이 힘들다. 따라서 3D 모델 검색 시스템의 필요성이 대두되고 많은 분야에서 그 정확도와 속도향상을 위한 3D 모델 검색 연산자(Descriptor)와 검색 알고리즘을 개발하기 위한 연구가 진행 중이다. 본 논문에서는 VRML 모델을 XML 데이터로 변환하여 3D 모델 검색에 사용하는 것이 주요 목표이다. 검색 방법은 크게 VRML의 노드 분류화를 통한 기본 도형에 대한 검색과 XML로 변환하면서 생성하는 무게중심(Mass-Center)을 이용한 검색 두 가지이다. 즉, 3D 모델 데이터베이스를 구축함으로써 VRML 노드를 통한 분류화와 라벨화된 3D 모델 데이터베이스 지원 등의 장점을 활용한다. 3D 모델을 Key값(Descriptor)을 생성하여 분류화된 XML 데이터로 저장하고, 처리하면 유사도 비교의 대상과 횟수가 많아질수록, 3D 모델을 바로 데이터베이스에서 검색에 사용할 수 있어 검색의 속도와 성능을 보다 증가시킬 수 있다. 보다 복잡한 3D 모델의 유사도 비교에 있어서는 Princeton Shape Benchmark(PSB)[1]에서 정확도가 가장 높게 평가된 방법인 LFD(Light Field Descriptor)[6] 검색 연산자를 사용한다. 이 방법은 3D 모델에서 2D 이미지를 얻어 검색하는 방법으로 많은 2D 이미지 관측점(View-Point)과 관측된 2D 이미지의 적합도를 비교하는 계산량이 많은 단점이 있다. 그래서 3D 모델검색을 위한 2D 이미지 관측에 있어 x, y, z축 방향의 관측점을 얻는 방법을 제안함으로써 2D 이미지의 관측점을 줄여 계산량을 대폭 감소시키는 장점을 갖는다.
Approximate Analytical Solutions of the Klein-Gordon Equation with an Exponential-type Potential
Akpan N. IKOT,Hillary P. OBONG,Tamunoimi M. ABBEY,Joy D. OLISA 한국물리학회 2015 새물리 Vol.65 No.8
The approximate analytical bound and scattering state of the Klein-Gordon equation in Ddimensions for an arbitrary l-state for a seven-parameter exponential-type potential is presented. We obtain the bound-state solutions by using the supersymmetry quantum mechanics method, and the normalized wave function and the scattering phase-shift factors are determined by using the properties of the partial-wave analysis technique. Special cases of the seven-parameter exponentialtype potential are discussed in detail.
Motiei-Langroudi Rouzbeh,Sadeghian Homa,Ekanem Uduak-Obong,Safdar Aleeza,Grossbach Andrew James,Viljoen Stephanus 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.6
Study Design: Prospective study.Purpose: To propose a scoring system for predicting the need for surgery in patients with lumbar disc herniation (LDH).Overview of Literature: The indications for surgery in patients with LDH are well established. However, the exact timing of surgery is not. According to surgeons, patients with failed conservative treatment who underwent delayed surgery, often after 6 months postsymptom initiation, have poor functional recovery and outcome.Methods: The current study included patients with symptomatic LDH. Patients with an indication for emergent surgery such as profound or progressive motor deficit, cauda equina syndrome, and diagnoses other than single-level LDH were excluded from the analysis. All patients followed a conservative treatment regimen (a combination of physical therapy, pain medications, and/or spinal epidural steroid injections). Surgery was indicated for patients who continuously experienced pain despite maximal conservative therapy.Results: In total, 134 patients met the inclusion and exclusion criteria. Among them, 108 (80.6%) responded to conservative management, and 26 (19.4%) underwent unilateral laminotomy and microdiscectomy. The symptom duration, disc degeneration grade on magnetic resonance imaging (Pfirrmann disc grade), herniated disc location and type, fragment size, and thecal sac diameter significantly differed between patients who responded to conservative treatment and those requiring surgery. The area under the receiver operating characteristic curve of the scoring system based on the anteroposterior size of the herniated disc fragment and herniated disc location and type was 0.81.Conclusions: A scoring system based on herniated disc/fragment size, location, and type can be applied to predict the need for surgery in patients with LDH. In the future, this tool can be used to prevent unnecessarily prolonged conservative management (>4–8 weeks).