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Search Results: 1 - 10 of 3610 matches for " Ieong Chon Man "
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Ultrasound Diagnosis of Cervical Vagal Schwannoma Misdiagnosed as Nodular Goiter  [PDF]
Ieong Chon Man, Kong Soi Chau
Open Journal of Radiology (OJRad) , 2018, DOI: 10.4236/ojrad.2018.84023
Abstract: Background: Schwannoma is a benign tumor derived from Schwann cells. The most common location was cerebellopontine angle (CPA). Neurilemmoma originated from the thyroid gland is very rare. Purpose: To discuss the diagnosis and treatment of cervical vagal schwannoma and the causes of misdiagnosis and preventive measures. Case Presentation: A case of cervical vagal schwannoma misdiagnosed as nodular goiter by ultrasonography was analyzed retrospectively. This patient was found to have pain in the neck for 1 month and then went to our hospital for treatment. After admission, a 5 cm × 4 cm mass was found on the left side of the neck, with a medium texture and clear margin. It could move with swallowing. Initially ultrasound showed a well circumscribed hypoechoic mass in the left thyroid lobe, which is suggestive of hemorrhage of thyroid nodule. Biopsy of thyroid nodules after ultrasound guided biopsy revealed Schwannoma. Surgical treatment and postoperative pathological examination confirmed cervical vagal schwannoma. The patient recovered well and was discharged 9 days after operation. Conclusion: The location of thyroid schwannoma is rare, the relationship between thyroid schwannoma and surrounding tissues is unclear, and there is no typical ultrasonic manifestation. Moreover, if doctors are not aware of their knowledge, it is easy to cause misdiagnosis. Radiologists should raise awareness of the disease and carefully analyze the results of ultrasonography in combination with the clinical manifestations of the patients so as to reduce or avoid misdiagnosis of cervical schwannoma.
Gastric Inflammatory Myofibroblastic Tumor in a 10-Year-Old Patient in Macao—Case Report and Literature Review  [PDF]
Ieong Chon Man, Kong Soi Chao, Cheng Fai
Journal of Cancer Therapy (JCT) , 2019, DOI: 10.4236/jct.2019.105028
Abstract: Inflammatory myofibroblastic tumor (IMT) is a special type of mesenchymal tumors. The tumors can occur all over the body. The most common organs involved were lung, followed by mesentery, omentum, retroperitoneum, and pelvic cavity. But it occurs very rarely in the stomach. This article mainly reports a 10-year-old patient who complained of progressive dysphagia for 4 years. Esophagogram suggests esophageal achalasia. Abdominal CT examination revealed a huge mass with calcification in the cardiac region of stomach with metastatic lymphadenopathy. PET-CT was also performed that consistent with malignant gastric tumor with metastatic lymphadenopathy. Gastroscopy also indicated that there was a huge mass in the cardia that compressed the esophagus, and biopsy was performed to reveal chronic gastritis. Pathological analysis was performed after surgical exploration and tissue samples were taken out and the final pathology was consistent with inflammatory myofibroblastic tumors. The patient was not able to undergo surgical treatment, so crizotinib chemotherapy was used. After treatment, the patient's tumors were significantly reduced, and the effect was obvious. The patient is now in stable condition and continues to follow up. This article hopes to review the literature of imaging diagnosis of inflammatory myofibroblastic tumors through this case report, so as to improve the understanding of this disease.
Antimicrobial Susceptibility Pattern of Bacteriuria and Risks of Therapeutic Failure among Pregnant Women in Primary Health Care of Macau, China  [PDF]
Mei-Fong Chou, Chau-Sha Kwok, Chon-Kit Ieong, Sai-Meng Pang
Open Journal of Obstetrics and Gynecology (OJOG) , 2019, DOI: 10.4236/ojog.2019.910130
Abstract: Both asymptomatic (ASB) and symptomatic bacteriuria during pregnancy increase the risk of adverse fetal or maternal outcomes. Our study aims to determine the prevalence of bacteriuria, the etiological agents with their susceptibility to antimicrobials, and the risk factors for therapeutic failure among pregnant women for antenatal care in the primary health care of Macau, China. Methods: This is a cross-sectional survey involving 5101 antenatal care pregnant women from 1st Jan to 31st Dec., 2017. The mid-stream clean-catch urine specimens were routinely examined microscopically and cultured following the first consultation. Other data were collected from the computerized medical records. Results: The mean age of the pregnant women was 31.4 ± 5.04 years. We followed 130 women with positive cultures on first consultation, of whom 35 (26.9%) were found to have contaminated cultures. 95 pregnant women were confirmed to have UTI. The prevalence of bacteriuria was 1.86% (n = 95), of which 83 (87.4%) were asymptomatic. ASB was mainly in the younger age-group (20 - 30 years) and the primipara. Of 196 positive cultures, the commonest bacterium was Escherichia coli
Hybrid Bounds on Twisted L-Functions Associated to Modular Forms
Chan Ieong Kuan
Mathematics , 2013,
Abstract: For $f$ a primitive holomorphic cusp form of even weight $k \geq 4$, square-free level $N$, and $\chi$ a Dirichlet character mod $Q$ with $(Q,N)=1$, we establish a new hybrid subconvex bound for $L(1/2 + it, f_\chi)$, which improves upon all known hybrid bounds. This is done via amplification and taking advantage of a shifted convolution sum of two variables defined and analyzed in a recent paper of Hoffstein and Hulse.
Predicting Preference Flips in Commerce Search
Or Sheffet,Nina Mishra,Samuel Ieong
Computer Science , 2012,
Abstract: Traditional approaches to ranking in web search follow the paradigm of rank-by-score: a learned function gives each query-URL combination an absolute score and URLs are ranked according to this score. This paradigm ensures that if the score of one URL is better than another then one will always be ranked higher than the other. Scoring contradicts prior work in behavioral economics that showed that users' preferences between two items depend not only on the items but also on the presented alternatives. Thus, for the same query, users' preference between items A and B depends on the presence/absence of item C. We propose a new model of ranking, the Random Shopper Model, that allows and explains such behavior. In this model, each feature is viewed as a Markov chain over the items to be ranked, and the goal is to find a weighting of the features that best reflects their importance. We show that our model can be learned under the empirical risk minimization framework, and give an efficient learning algorithm. Experiments on commerce search logs demonstrate that our algorithm outperforms scoring-based approaches including regression and listwise ranking.
Encouraging the Inclusion of Evolutionary Psychology into Information Systems’ Theoretical Repertoire as an Emerging Trend
Chon Abraham
Journal of Emerging Trends in Computing and Information Sciences , 2010,
Abstract: Social and cognitive psychology frames have dominated IS researchers’ attention in developing and applying theory to explain human behavior in the context of IS. However with a few exceptions, the information systems literature has largely ignored the possible explanatory power of evolutionary psychology. This is a major omission, particularly as Darwin argued that perception and cognition, areas of IS interest, are the product of evolution of the human brain adapting to motivate behavior that supports productive decision-making. It seems appropriate for IS research to recognize that humans are an evolved, social, cognitive species. In this paper, we encourage IS scholars to appreciate the potential contribution of evolutionary psychology as an emerging trend to enrich the theoretical repertoire for information systems.
Structured Query Reformulations in Commerce Search
Sreenivas Gollapudi,Samuel Ieong,Anitha Kannan
Computer Science , 2012,
Abstract: Recent work in commerce search has shown that understanding the semantics in user queries enables more effective query analysis and retrieval of relevant products. However, due to lack of sufficient domain knowledge, user queries often include terms that cannot be mapped directly to any product attribute. For example, a user looking for {\tt designer handbags} might start with such a query because she is not familiar with the manufacturers, the price ranges, and/or the material that gives a handbag designer appeal. Current commerce search engines treat terms such as {\tt designer} as keywords and attempt to match them to contents such as product reviews and product descriptions, often resulting in poor user experience. In this study, we propose to address this problem by reformulating queries involving terms such as {\tt designer}, which we call \emph{modifiers}, to queries that specify precise product attributes. We learn to rewrite the modifiers to attribute values by analyzing user behavior and leveraging structured data sources such as the product catalog that serves the queries. We first produce a probabilistic mapping between the modifiers and attribute values based on user behavioral data. These initial associations are then used to retrieve products from the catalog, over which we infer sets of attribute values that best describe the semantics of the modifiers. We evaluate the effectiveness of our approach based on a comprehensive Mechanical Turk study. We find that users agree with the attribute values selected by our approach in about 95% of the cases and they prefer the results surfaced for our reformulated queries to ones for the original queries in 87% of the time.
Study on Environmental and Economic Development in Guangdong Province  [PDF]
Man Zhang
Open Journal of Social Sciences (JSS) , 2017, DOI: 10.4236/jss.2017.52005
Abstract: With the continuous economic and social development and progress, Guangdong Province, while maintaining rapid economic growth, environmental conditions are deteriorating. Therefore, it is of great significance to study the coordinated development of ecological environment and economy in Guangdong. While the Environmental Kuznets Curve is the curve describing the relationship between environmental pressure and income per capita, this paper briefly introduces the research background and significance of this topic and the status quo of domestic and foreign research, and then introduces the economic development and the status of environmental quality of Guangdong. Then, it uses the EKC model to analyze the relationship between economic growth and environmental pollution in Guangdong, and analyzes shape and position of the EKC of Guangdong. Finally, it provides some suggestions for the coordinated development of environment and economy in Guangdong.
Characterization of Porous WO3 Electrochromic Device by Electrochemical Impedance Spectroscopy
Chien Chon Chen
Journal of Nanomaterials , 2013, DOI: 10.1155/2013/785023
Geometry of weak lensing of CMB polarization
Anthony Challinor,Gayoung Chon
Physics , 2003, DOI: 10.1103/PhysRevD.66.127301
Abstract: Hu [Phys. Rev. D62 (2000) 043007] has presented a harmonic-space method for calculating the effects of weak gravitational lensing on the cosmic microwave background (CMB) over the full sky. Computing the lensed power spectra to first order in the deflection power requires one to formulate the lensing displacement beyond the tangent-space approximation. We point out that for CMB polarization this displacement must undergo geometric corrections on the spherical sky to maintain statistical isotropy of the lensed fields. Although not discussed by Hu, these geometric effects are implicit in his analysis. However, there they are hidden by an overly-compact notation that is both unconventional and rather confusing. Here we aim to ameliorate this deficiency by providing a rigorous derivation of the lensed spherical power spectra.
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