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Amin, Tarek Tawfik,Al-Hammam, Abudllah Mohammed,AlMulhim, Nasser Abdullah,Al-Hayan, Mohammed Ibrahim,Al-Mulhim, Mona Mohammed,Al-Mosabeh, Modhahir Jawad,Al-Subaie, Mohammed Ali,Al-Hmmad, Qassem Ahmed Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6
Background: There is a scarcity of information about the proportion of the adult Saudi population that meet the recommended guidelines of physical activity (PA) to reduce cancer risk. Moreover, their awareness about the role of PA in cancer prevention is unclear. Objectives: This cross-sectional study aimed at estimating the proportion of adult Saudis meeting the PA guidelines, specifically those recommended by American Cancer Society (ACS) for cancer prevention, and to assess the public awareness about the role of PA in cancer prevention. Materials and Methods: Using a multistage sampling method, 2,127 adult Saudis of both genders were recruited from 6 urban and 4 rural primary health care centers in Al Hassa, Saudi Arabia. Participants were personally interviewed to gather information about their sociodemographic characteristics, searching activity about PA and cancer, and the time spent in leisure time PA (moderate and vigorous)/week using the Global Physical Activity Questionnaire with show cards. Finally, items about the role of PA in cancer risk reduction were inquired. Results: Of the included participants, 11.6% met the recommendations for cancer prevention (${\geq}45$ minutes of moderate-vigorous PA activity/${\geq}5$ days/week or 225 minutes/week). Multivariate regression showed that being male (AOR=1.49, CI=1.09-2.06), <20 years of age (AOR=3.11, CI=2.03-4.76), and unemployed (AOR=2.22, CI=1.57-3.18) were significant predictors for meeting PA recommendations for cancer prevention. Only 11.4% of the sample indicated correctly the frequency and duration of PA required for an average adult to be physically active and while >70% of them indicated the role of PA in prevention of hypertension, coronary heart disease and lowering elevated blood cholesterol, only 18.6% and 21.7% correctly mentioned the role of PA in reducing colon and breast cancer risk, respectively. Poor knowledge was found among those with less than college education and aged ${\geq}50$ years. The level of knowledge was significantly positively correlated with total leisure time PA of the participants. Conclusions: A minority of adult Saudis in Al Hassa was aware about the role of PA in cancer prevention and engaged in sufficient LTPA for cancer risk reduction benefits, highlighting the need for public health actions to include policies and programs that address factors deterring their participation in LTPA and increasing their awareness with remedies to manage the prevalent misconceptions.
L^(p) Boundedness for Singular Integral Operators with L(log^(+) L)² Kernels on Product Spaces
AL-QASSEM, HUSSAIN,ALI, MOHAMMED 대한수학회 2006 Kyungpook mathematical journal Vol.46 No.3
In this paper, we study the L^(P) mapping properties of singular integral operators related to homogeneous mappings on product spaces with kernels which belong to L(log^(+) L)^(2). Our results extend as well as improve some known results on singular integrals.
Weighted L<sup>P</sup> Estimates for a Rough Maximal Operator
Al-Qassem, H.M. Department of Mathematics 2005 Kyungpook mathematical journal Vol.45 No.2
This paper is concerned with studying the weighted $L^P$ boundedness of a class of maximal operators related to homogeneous singular integrals with rough kernels. We obtain appropriate weighted $L^P$ bounds for such maximal operators. Our results are extensions and improvements of the main theorems in [2] and [5].
[L<sup>p</sup>] ESTIMATES FOR A ROUGH MAXIMAL OPERATOR ON PRODUCT SPACES
AL-QASSEM HUSSAIN MOHAMMED Korean Mathematical Society 2005 대한수학회지 Vol.42 No.3
We establish appropriate $L^p$ estimates for a class of maximal operators $S_{\Omega}^{(\gamma)}$ on the product space $R^n\;\times\;R^m\;when\;\Omega$ lacks regularity and $1\;\le\;\gamma\;\le\;2.\;Also,\;when\;\gamma\;=\;2$, we prove the $L^p\;(2\;{\le}\;P\;<\;\infty)\;boundedness\;of\;S_{\Omega}^{(\gamma)}\;whenever\;\Omega$ is a function in a certain block space $B_q^{(0,0)}(S^{n-1}\;\times\;S^{m-1})$ (for some q > 1). Moreover, we show that the condition $\Omega\;{\in}\;B_q^{(0,0)}(S^{n-1}\;\times\;S^{m-1})$ is nearly optimal in the sense that the operator $S_{\Omega}^{(2)}$ may fail to be bounded on $L^2$ if the condition $\Omega\;{\in}\;B_q^{(0,0)}(S^{n-1}\;\times\;S^{m-1})$ is replaced by the weaker conditions $\Omega\;{\in}\;B_q^{(0,\varepsilon)}(S^{n-1}\;\times\;S^{m-1})\;for\;any\;-1\;<\;\varepsilon\;<\;0.$
Weighted L<sup>p</sup> Boundedness for the Function of Marcinkiewicz
Al-Qassem, Hussain M. Department of Mathematics 2006 Kyungpook mathematical journal Vol.46 No.1
In this paper, we prove a weighted norm inequality for the Marcinkiewicz integral operator $\mathcal{M}_{{\Omega},h}$ when $h$ satisfies a mild regularity condition and ${\Omega}$ belongs to $L(log L)^{1l2}(S^{n-1})$, $n{\geq}2$. We also prove the weighted $L^p$ boundedness for a class of Marcinkiewicz integral operators $\mathcal{M}^*_{{\Omega},h,{\lambda}}$ and $\mathcal{M}_{{\Omega},h,S}$ related to the Littlewood-Paley $g^*_{\lambda}$-function and the area integral S, respectively.
WEIGHTED ESTIMATES FOR ROUGH PARAMETRIC MARCINKIEWICZ INTEGRALS
Al-Qassem, Hussain Mohammed Korean Mathematical Society 2007 대한수학회지 Vol.44 No.6
We establish a weighted norm inequality for a class of rough parametric Marcinkiewicz integral operators $\mathcal{M}^{\rho}_{\Omega}$. As an application of this inequality, we obtain weighted $L^p$ inequalities for a class of parametric Marcinkiewicz integral operators $\mathcal{M}^{*,\rho}_{\Omega,\lambda}\;and\;\mathcal{M}^{\rho}_{\Omega,S}$ related to the Littlewood-Paley $g^*_{\lambda}-function$ and the area integral S, respectively.
Weighted L^(p) Boundedness for the Function of Marcinkiewicz
AL-QASSEM, HUSSAIN M. 대한수학회 2006 Kyungpook mathematical journal Vol.46 No.1
In this paper, we prove a weighted norm inequality for the Marcinkiewicz integral operator M_(Ω,h) when h satisfies a mild regularity condition and Ω belongs to L(log L)^(1/2)(S^(n-1)), n ≥ 2. We also prove the weighted L^(P) boundedness for a class of Marcinkiewicz integral operators M^(*)_(Ω,h,λ) and M_(Ω,h,s) related to the Littlewood-Paley g^(*)_(λ)-function and the area integral S, respectively.
A van der Corput type lemma for oscillatory integrals with H\"older amplitudes and its applications
Hussain Al-Qassem,Leslie Cheng 대한수학회 2021 대한수학회지 Vol.58 No.2
We prove a decay estimate for oscillatory integrals with \linebreak H\"older amplitudes and polynomial phases. The estimate allows us to answer certain questions concerning the uniform boundedness of oscillatory singular integrals on various spaces.
Lp ESTIMATES FOR A ROUGH MAXIMALOPERATOR ON PRODUCT SPACES
Hussain Mohammed Al-Qassem 대한수학회 2005 대한수학회지 Vol.42 No.3
We establish appropriate Lp estimates for a class of maximal operators S(°) on the product space Rn £ Rm when lacks regularity and 1 · ° · 2. Also, when ° = 2; we prove the Lp (2 · p < 1) boundedness of S(2)whenever is a function in a certain block space B(0;0) q (Sn¡1 £ Sm¡1) (for some q > 1). Moreover, we show that the condition 2 B(0;0) q (Sn¡1 £ Sm¡1) is nearly optimal in the sense that the operator S(2) may fail to be bounded on L2 if the condition 2 B(0;0)q (Sn¡1 £ Sm¡1) is replaced by the weaker conditions 2 B(0;") q (Sn¡1£Sm¡1) for any ¡1 < " < 0