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Schatten's theorem on absolute Schur algebras
Jitti Rakbud,Pachara Chaisuriya 대한수학회 2008 대한수학회지 Vol.45 No.2
In this paper, we study duality in the absolute Schur algebras that were first introduced in [1] and extended in [5]. This is done in a way analogous to the classical Schatten’s Theorem on the Banach space B(l₂) of bounded linear operators on l₂ involving the duality relation among the class of compact operators K, the trace class C₁ and B(l₂). We also study the reflexivity in such the algebras. In this paper, we study duality in the absolute Schur algebras that were first introduced in [1] and extended in [5]. This is done in a way analogous to the classical Schatten’s Theorem on the Banach space B(l₂) of bounded linear operators on l₂ involving the duality relation among the class of compact operators K, the trace class C₁ and B(l₂). We also study the reflexivity in such the algebras.
SCHATTEN CLASSES OF MATRICES IN A GENERALIZED B(l2)
Jitti Rakbud,Pachara Chaisuriya 대한수학회 2010 대한수학회지 Vol.47 No.1
In this paper, we study a generalization of the Banach space B(l2) of all bounded linear operators on l2. Over this space, we present some reasonable ways to define Schatten-type classes which are generalizations of the classical Schatten classes of compact operators on l2.
SEQUENCE SPACES OF OPERATORS ON l_2
Jitti Rakbud,Sing-Cheong Ong 대한수학회 2011 대한수학회지 Vol.48 No.6
In this paper, we define some new sequence spaces of infinite matrices regarded as operators on l_2 by using algebraic properties of such the matrices under the Schur product multiplication. Some of their basic properties as well as duality and preduality are discussed.
Fear of cancer recurrence and its predictors among cervical cancer survivors
Jitti Hanprasertpong,Alan Geater,Ingporn Jiamset,Laaong Padungkul,Phongchawee Hirunkajonpan,Nartya Songhong 대한부인종양학회 2017 Journal of Gynecologic Oncology Vol.28 No.6
Objective: To identify the characteristics of fear of cancer recurrence (FCR) in cervical cancer survivors (CCSs) and investigate the relationship of FCR with demographic and medical characteristics, level of quality of life (QOL), and psychological distress. We also aimed to determine the predictors of FCR. Methods: The short version of the Fear of Progression Questionnaire (FoP-Q-SF), the Hospital Anxiety and Depression Scale (HADS), and the Functional Assessment of Cancer Therapy-Cervical (FACT-Cx) questionnaire were administered to 699 CCSs who had complete treatment at Songklanagarind Hospital between 2006 and 2016. Analysis was performed to determine potential predictors associated with FCR. Results: Among the 12 items of the FoP-Q-SF, the 3 greatest fears were 1) worrying about what would happen to their family; 2) being afraid of pain; and 3) fear of disease progression. The prevalences of anxiety and depression disorder were 20.46% and 9.44%, respectively. CCSs who had FCR at the 5th quintile were more likely to have medical co-morbidities, low FACT-Cx scores in all domains and a high HADS scores (anxiety and depression disorder). Multivariate analysis showed that only anxiety disorder (odds ratio [OR]=4.99; p<0.001) and low FACT-Cx score (total) (OR=6.14; p<0.001) were identified as independent predictors for FCR at the 5th quintile. Conclusion: FCR is an important problem in cervical cancer which should be addressed during post-treatment care. Only anxiety disorder and low QOL were independently associated with high FCR
Jitti Hanprasertpong,Ingporn Jiamset,Alan Geater,Kittinun Leetanaporn,Thanarpan Peerawong 대한부인종양학회 2017 Journal of Gynecologic Oncology Vol.28 No.4
Objective: To determine the impact of time interval (TI) from radical hysterectomy with pelvicnode dissection (RHND) to adjuvant therapy on oncological outcomes in cervical cancer. Methods: The study included 110 stage IA2–IB1 cervical cancer patients who underwentRHND and adjuvant therapy. The patients were divided into 2 groups based on the cut-offpoints of TI of 4 and 6 weeks, respectively. The associations of TI and clinicopathologic factorswith oncological outcomes were evaluated using Cox proportional-hazards regression. Results: The median TI was 4.5 weeks. There were no statistical differences in 5-yearrecurrence-free survival (RFS) (89.2% vs. 81.0%, and 83.2% vs. 100.0%) or 5-year overallsurvival (OS) rates (90.9% vs. 97.2%, and 93.2% vs. 100.0%) between patients accordingto TI (≤4 vs. >4, and ≤6 vs. >6 weeks, respectively). Deep stromal invasion (p=0.037), andparametrial involvement (PI) (p=0.002) were identified as independent prognostic factorsfor RFS, together with the interaction between TI and squamous cell carcinoma histology(p<0.001). In patients with squamous cell carcinoma, a TI longer than 4 weeks wassignificantly associated with a worse RFS (hazard ratio [HR]=15.8; 95% confidence interval[CI]=1.4–173.9; p=0.024). Univariate analysis showed that only tumor size (p=0.023), and PI(p=0.003) were significantly associated with OS. Conclusion: Delay in administering adjuvant therapy more than 4 weeks after RHND in earlystage squamous cell cervical cancer results in poorer RFS.
SEQUENCE SPACES OF OPERATORS ON l<sub>2</sub>
Rakbud, Jitti,Ong, Sing-Cheong Korean Mathematical Society 2011 대한수학회지 Vol.48 No.6
In this paper, we define some new sequence spaces of infinite matrices regarded as operators on $l_2$ by using algebraic properties of such the matrices under the Schur product multiplication. Some of their basic properties as well as duality and preduality are discussed.
SCHATTEN CLASSES OF MATRICES IN A GENERALIZED B(l<sub>2</sub>)
Rakbud, Jitti,Chaisuriya, Pachara Korean Mathematical Society 2010 대한수학회지 Vol.47 No.1
In this paper, we study a generalization of the Banach space B($l_2$) of all bounded linear operators on $l_2$. Over this space, we present some reasonable ways to define Schatten-type classes which are generalizations of the classical Schatten classes of compact operators on $l_2$.
Defects and the optical band gap of ZnO nanoparticles prepared by a grinding method
Phuriwat Jitti-a-porn,Sumetha Suwanboon,Pongsaton Amornpitoksuk,Orasa Patarapaiboolchai 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.1
Zinc oxide (ZnO) nanoparticles with different sizes and shapes were prepared by a grinding method. Phase identification was carried out by XRD, the results showed that all samples exhibited a wurtzite structure. The particle shapes were determined by SEM. A spherical structure changed to a flower shape when the OH- concentration increased. The optical band gap was evaluated by measurements of the optical absorption with a UV-Vis spectrophotometer. The optical band gap was dependent strongly on the defect concentration in the ZnO. In this study, the presence of the flower-like structure gave rise to a reduction of the optical band gap due to the increase of oxygen vacancies that could be confirmed by the EPR measurements.
SCHATTEN'S THEOREM ON ABSOLUTE SCHUR ALGEBRAS
Rakbud, Jitti,Chaisuriya, Pachara Korean Mathematical Society 2008 대한수학회지 Vol.45 No.2
In this paper, we study duality in the absolute Schur algebras that were first introduced in [1] and extended in [5]. This is done in a way analogous to the classical Schatten's Theorem on the Banach space $B(l_2)$ of bounded linear operators on $l_2$ involving the duality relation among the class of compact operators K, the trace class $C_1$ and $B(l_2)$. We also study the reflexivity in such the algebras.