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Mapping Block Information Recovery
( Alahmadi Abdulhadi ),( Tae Sun Chung ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
In this paper we proposed Mapping Block Information Recovery (MBIR) for flash memory based storage devices. According to the data access problems in mapping method our idea can save the map block information in two tables, the first one is original and the second one is a capy one. We can do it by using shadow technical. We going to using shadow technical advantages to be familiar with Flash Translation Layer (FTL) to improving the capacity for flash memory.
SOME REMARKS ON CATEGORIES OF MODULES MODULO MORPHISMS WITH ESSENTIAL KERNEL OR SUPERFLUOUS IMAGE
Alahmadi, Adel,Facchini, Alberto Korean Mathematical Society 2013 대한수학회지 Vol.50 No.3
For an ideal $\mathcal{I}$ of a preadditive category $\mathcal{A}$, we study when the canonical functor $\mathcal{C}:\mathcal{A}{\rightarrow}\mathcal{A}/\mathcal{I}$ is local. We prove that there exists a largest full subcategory $\mathcal{C}$ of $\mathcal{A}$, for which the canonical functor $\mathcal{C}:\mathcal{C}{\rightarrow}\mathcal{C}/\mathcal{I}$ is local. Under this condition, the functor $\mathcal{C}$, turns out to be a weak equivalence between $\mathcal{C}$, and $\mathcal{C}/\mathcal{I}$. If $\mathcal{A}$ is additive (with splitting idempotents), then $\mathcal{C}$ is additive (with splitting idempotents). The category $\mathcal{C}$ is ample in several cases, such as the case when $\mathcal{A}$=Mod-R and $\mathcal{I}$ is the ideal ${\Delta}$ of all morphisms with essential kernel. In this case, the category $\mathcal{C}$ contains, for instance, the full subcategory $\mathcal{F}$ of Mod-R whose objects are all the continuous modules. The advantage in passing from the category $\mathcal{F}$ to the category $\mathcal{F}/\mathcal{I}$ lies in the fact that, although the two categories $\mathcal{F}$ and $\mathcal{F}/\mathcal{I}$ are weakly equivalent, every endomorphism has a kernel and a cokernel in $\mathcal{F}/{\Delta}$, which is not true in $\mathcal{F}$. In the final section, we extend our theory from the case of one ideal$\mathcal{I}$ to the case of $n$ ideals $\mathcal{I}_$, ${\ldots}$, $\mathca{l}_n$.
COMPARISON OF THE LEE AND HOMOGENOUS WEIGHTS OVER A FAMILY OF CHAIN RINGS
Alahmadi, Adel,Alkenani, Ahmad,Alomari, Rahmah,Muthana, Najat,Sole, Patrick,Yildiz, Bahattin Korean Mathematical Society 2018 대한수학회보 Vol.55 No.2
We compare the Lee and homogenous weights over the chain ring $S_{q,m}={\mathbb{F}}_q[u]/(u^m)$ by computing the minimum distance of random codes for small values of n, q, m.
DIRECTED STRONGLY REGULAR GRAPHS AND THEIR CODES
Alahmadi, Adel,Alkenani, Ahmad,Kim, Jon-Lark,Shi, Minjia,Sole, Patrick Korean Mathematical Society 2017 대한수학회보 Vol.54 No.2
The rank over a finite field of the adjacency matrix of a directed strongly regular graph is studied, with some applications to the construction of linear codes. Three techniques are used: code orthogonality, adjacency matrix determinant, and adjacency matrix spectrum.
Comparison of the Lee and homogenous weights over a family of chain rings
Adel Alahmadi,Ahmad Alkenani,Rahmah Alomari,Najat Muthana,Patrick Sole,Bahattin Yildiz 대한수학회 2018 대한수학회보 Vol.55 No.2
We compare the Lee and homogenous weights over the chain ring $S_{q,m}=\F_q[u]/(u^m)$ by computing the minimum distance of random codes for small values of $n,q,m.$
Outcome of Salvage Lumbar Fusion after Lumbar Arthroplasty
Hussein Alahmadi,Harel Deutsch 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.1
Study Design: Retrospective review. Purpose: This study aims to define the role of lumbar fusion for persistent back pains after the lumbar disc replacement. Overview of Literature: Little is written about lumbar fusion after optimally placed lumbar arthroplasty in patients with persistent lower back pains. Methods: Retrospective review of cases of lumbar artificial disc requiring subsequent fusion because of persistent back pains despite optimally placed artificial discs. Outcomes were evaluated using Oswestry Disability Index (ODI) and visual analogue scale (VAS). Clinical improvements indicated 25% improvement in ODI and VAS values. Results: Five patients met the study criteria. The mean baseline ODI for the five patients was 52. The mean baseline VAS scores for back and leg pains were 76 and 26, respectively. All the five patients had optimally placed prosthesis. The indication for surgery was the constant low back pains found in all the patients. Revision surgery involved disc explantation and fusion in two of the patients and posterolateral fusion without removing the prosthesis in three. None of the patients achieved adequate pain control after the revision surgery despite the solid bony fusion documented by postoperative computed tomography. The mean ODI value after the fusion was 55. The mean values for back and leg pains VAS were 72 and 30, respectively. Conclusions: Lack of good pain relief after successful lumbar artifical disc replacements may indicate different etiology for the back pains. The spine-treating surgeons should have a high threshold level to perform salvage fusion at that level.
Directed strongly regular graphs and their codes
Adel Alahmadi,Ahmad Alkenani,김종락,Minjia Shi,Patrick Sole 대한수학회 2017 대한수학회보 Vol.54 No.2
The rank over a finite field of the adjacency matrix of a directed strongly regular graph is studied, with some applications to the construction of linear codes. Three techniques are used: code orthogonality, adjacency matrix determinant, and adjacency matrix spectrum.
Some remarks on categories of modules modulo morphisms with essential kernel or superfluous image
Adel Alahmadi,Alberto Facchini 대한수학회 2013 대한수학회지 Vol.50 No.3
For an ideal L of a preadditive category A, we study whenthe canonical functor C: A → A/L is local. We prove that there existsa largest full subcategory C of A for which the canonical functor C : C → C/L is local. Under this condition, the functor C turns out to bea weak equivalence between C and C/L. If A is additive (with splittingidempotents), then C is additive (with splitting idempotents). The category C is ample in several cases, such as the case when A = Mod-R andI is the ideal Δ of all morphisms with essential kernel. In this case, thecategory C contains, for instance, the full subcategory F of Mod-R whoseobjects are all the continuous modules. The advantage in passing fromthe category F to the category F/L lies in the fact that, although thetwo categories F and F/L are weakly equivalent, every endomorphismhas a kernel and a cokernel in F/Δ, which is not true in F. In the finalsection, we extend our theory from the case of one ideal I to the case ofn ideals L1, . . . , Ln.
Do aminopyridinium-based ionic liquids promising to control Culex pipiens mosquitoes in the future?
Ibrahim Reda,Alahmadi Saeed,Almarwani Abeer,Shawer Dalia,Ali Medhat 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.4
In Al-Madinah Al-Munawwarah region, Kingdom of Saudi Arabia, Culex pipiens is considered one of the most common mosquitoes. Owing to their exceptional chemical, physical, biological, and eco-friendly properties, ionic liquids (ILs) have been recently considered promising compounds in managing a variety of organisms. Six aminopyridinium-based IL derivatives were assessed to follow their efficacy against adults of C. pipiens. Mosquitoes were treated with aminopyridinium-based IL derivatives either orally or by spraying. It was observed in the first three days of treatment that the accumulated mortality rates were generally higher in sprayed mosquitoes with IL derivatives than their accumulated mortality rates in orally treated mosquitoes with the same ILs. It was also observed that the accumulated mortalities of sprayed mosquitoes at 0.125 and 0.25 g/L were higher than those in mosquitoes orally treated with the same concentrations. The highest mortality rates were 64 and 80% for sprayed and orally treated mosquitoes, respectively. The mode of action of aminopyridinium-based IL derivatives was tracked, and it is demonstrated to be through the digestive route for orally treated mosquitoes. This is the first study to show the adulticidal effects of aminopyridinium-based ILs in controlling C. pipiens.