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- 저자 : Zafrullah, Muhammad (검색결과 5 건)
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Anderson, D. D.,Kwak, Dong Je,Zafrullah, Muhammad 경북대학교 위상수학 기하학연구센터 1995 硏究論文集 Vol.4 No.-
An integral domain D with quotient field K is defined to be agreeable if for each fractional ideal F of D[X] with F ⊆ K[X] there exists 0 ≠ s ∈ D with sF ⊆ D[X]. D is agreeable ⇔ D satisfies property (*) (for 0 ≠ f(X) ∈ K[X], there exists 0 ≠ s ∈ D so that f(X)g(X) ∈ D[X] for g(X) ∈ K(X) implies that sg(X) ∈ D[X]) ⇔ D[X] is an almost principal domain, i.e., for each nonzero ideal I of D[X] with IK[X] ≠ K[X], there exists f(X) ∈ I and 0 ≠ s ∈ D with sI ⊆ (f(X)). If D is Noetherian or integrally closed, then D is agreeable. A number of other characterizations of agreeable domains are given as are a number of stability properties. For example, if D is agreeable, so is ??Dp_(a) and for a pair of domains D ⊆ D′ with [D: D′] ≠ 0, D is agreeable ⇔ D′ is agreeable. Results on agreeable domains are used to give an alternative treatment of Querre’s characterization of divisorial ideals in integrally closed polynomial rings. Finally, the various characterizations of D being agreeable are considered for polynomial rings in several variables.
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Rameez Asif,Muhammad Khawar Islam,Muhammad Zafrullah 한국광학회 2013 Current Optics and Photonics Vol.17 No.1
We have numerically implemented a receiver side all-optical signal processing method, i.e. optical backward propagation (OBP), by dispersion compensating fiber (DCF) and non-linear compensator (NLC)devised by effective negative Kerr non-linear coefficient using two highly non-linear fibers (HNLFs). The method is implemented for the post-processing of fiber transmission impairments, i.e. chromatic dispersion (CD) and non-linearities (NL). The OBP module is evaluated for dual-polarization (DP) m-ary (m=4,16,32,64,256)quadrature amplitude modulation (QAM) in 112 Gbit/s coherent transmission over 1200 km standard single mode fiber (SMF). We have also investigated an intensity limited optical backward propagation module (IL-OBP) by using a self-phase modulation-based optical limiter with an appropriate pre-chirping to compensate for the intensity fluctuations in the transmission link. Our results show that in highly non-linear sensitive 256QAM transmission, we have observed a 66% increase in the transmission distance by implementing IL-OBP as compared to conventional OBP.
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Trumpet Laminectomy Microdecompression for Lumbal Canal Stenosis
Jefri Henky,Muneyoshi Yasuda,Muhammad Zafrullah Arifin,Masakazu Takayasu,Ahmad Faried 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.5
Microsurgery techniques are useful innovations towards minimizing the insult of canal stenosis. Here, we describe the trumpet laminectomy microdecompression (TLM) technique, advantages and disadvantages. Sixty-two TLM patients with lumbar disc herniation, facet hypertrophy or yellow ligament or intracanal granulation tissue. The symptoms are low back pain, dysesthesia and severe pain on both legs. Spine levels operated Th11–S1; the patients who had trumpet-type fenestration, 62.9% had hypertrophy of the facet joint, 11.3% had intracanal granulation tissue, 79.1% had hypertrophy of the yellow ligament and 64.5% had disc herniation. The average of procedure duration was 68.9 min and intraoperative blood loss was 47.4 mL. Intraoperative complications were found in 3.2% of patients, with dural damage but without cerebrospinal fluid leakage. The TLM can be performed for all ages and all levels of spinal canal stenosis, without the complication of spondilolistesis. The TLM has a shorter duration, with minimal intraoperative blood loss.
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Bolly, Hendrikus Masang Ban,Faried, Ahmad,Hermanto, Yulius,Lubis, Billy Parulian,Tjahjono, Firman Priguna,Hernowo, Bethy Suryawathy,Arifin, Muhammad Zafrullah The Korean Neurosurgical Society 2021 Journal of Korean neurosurgical society Vol.64 No.1
Objective : Diffuse astrocytic tumour (DAT) is a diffuse infiltrative astrocytoma tumour accompanied by molecular parameters such as the presence or absence of isocitrate dehydrogenase (IDH) gene mutations. Ki-67 is a marker for DAT proliferation, while programmed death ligand 1 (PD-L1) indicates an immune evasion mechanism. This study aimed to analyze the correlation among mutant IDH1 R132H, Ki-67, and PD-L1 immunoexpression in the DAT. Methods : A cross-sectional study was carried out on 30 paraffin blocks of DAT cases. Paraffin block samples consist of grade II (n=14), grade III (n=8), and grade IV (n=8). In this study, the immunohistochemistry-staining of mutant IDH1 R132H, Ki-67, and PD-L1 were carried out to determine the frequency of DAT with IDH1 mutations. Results : Our study shown the frequency of IDH1 mutations in grade II 50.0% (7/14), grade III 37.5% (3/8), and grade IV 12.5% (1/8). Our study also showed a difference in Ki-67 and PD-L1 expression between each the degree of DAT histopathology (p=0.0001 and p=0.002, respectively). There was an association between both mutant IDH1 R132H, and Ki-67 with PD-L1 expression in DAT (p=0.0087 and p=0.0049, respectively). Conclusion : DAT with the mutant IDH1 is frequently observed in grade II and small number of grade III. The expression of wild type IDH1, Ki-67, and PD-L1 were found to be higher in high grade DAT (grade III and grade IV). There is a correlation between each of mutant IDH1 status and Ki-67 with PD-L1 expression in DAT.
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