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Search Results: 1 - 10 of 108312 matches for " Yu-Jun Chang "
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Psychometric evaluation of the Taiwan Chinese version of the EORTC QLQ-PR25 for HRQOL assessment in prostate cancer patients
Chang Yu-Jun,Liang Wen-Miin,Wu Hsi-Chin,Lin Hsueh-Chun
Health and Quality of Life Outcomes , 2012, DOI: 10.1186/1477-7525-10-96
Abstract: Objective To evaluate the psychometric properties of the Taiwan Chinese Version of the EORTC QLQ-PR25 health-related quality of life (HRQOL) questionnaire for patients with prostate cancer. Methods 135 prostate cancer patients were recruited in the urology outpatient clinic of a university teaching hospital. Each patient completed the EORTC QLQ-PR25 at every clinic visit between 2004 and 2008, totaling 633 assessments. Confirmatory factor analysis and Rasch analysis were used to evaluate the domain- and item-level psychometric properties. Results The results supported the unidimensionality of each of the four EORTC QLQ-PR25 domains (urinary, bowel, and hormonal-treatment-related symptoms, and sexual functioning). Item calibrations for each domain were found invariant across the three assessment time periods. The item-person maps showed 71.3% of item coverage for the urinary symptoms domain and 13–42.7% for the other three domains. Conclusions The Taiwan Chinese Version of the EORTC QLQ-PR25 questionnaire is reliable and can be used to measure HRQOL over time. Adding new items to each domain may improve its clinical content coverage and measurement precision.
Interpreting the Shortwave Infrared & Thermal Infrared Regions of Remote Sensed Electromagnetic Spectrum with Application for Mineral-Deposits Exploration  [PDF]
Yu-Jun Zhang, Fo-Jun Yao
Journal of Applied Mathematics and Physics (JAMP) , 2015, DOI: 10.4236/jamp.2015.32037

The ASTER (Advanced Space-borne Thermal Emission and Reflection radiometer) data, including all the 3 parts: VNIR (Visible and Near-Infrared), SWIR (Short Wave Infrared), TIR (Thermal Infrared), were applied for extraction of mineral deposits, such as the Ni-Cu deposit in eastern Tianshan, the gypsum in western Tianshan, and the borax in Tibetan. This paper discusses the extraction methodology using the ASTER remote sensing data and reveals the good extraction results. This paper bravely represents the summary of the main achievement for this field by the scientists in other countries and gives a comparison with the works by others. The new achievements, described in this paper, comprise the extraction of anomalies for Ni-Cu deposit, gypsum, and borax.

Coupling of Acoustical Plane p-Wave to a Cased Borehole

QIU Chang-Chun,ZHANG Bi-Xing,ZHANG Yu-Jun,CUI Zhi-Wen,

中国物理快报 , 2009,
Abstract: Theoretical and numerical study on the coupling acoustic field of the plane p-wave to a cased borehole is carried out. The medium outside the cased borehole is modeled as the porous medium. The scattering field characteristics in the cased borehole are investigated when a plane fast p-wave is incident in tilt to the cased borehole from the porous medium. The scattering fields inside and outside the cased borehole are analyzed and deduced by Biot's theory under the boundary conditions on each interface, and they are numerically studied. It is found that the scattering field has strong resonant characteristics and there exists a series of resonant frequencies and peaks. The effects of the frequency, radii of each interface, incident angle, porosity, and other parameters on the resonant acoustic field have been investigated in detail in the fast and slow formations respectively.The resonant characteristics of the scattering field are also analyzed from the physical sense.
First-attack pediatric hypertensive crisis presenting to the pediatric emergency department
Wen-Chieh Yang, Lu-Lu Zhao, Chun-Yu Chen, Yung-Kang Wu, Yu-Jun Chang, Han-Ping Wu
BMC Pediatrics , 2012, DOI: 10.1186/1471-2431-12-200
Abstract: This was a retrospective study conducted from 2000 to 2007 in pediatric patients aged 18 years and younger with a diagnosis of hypertensive crisis at the ED. All patients were divided into four age groups (infants, preschool age, elementary school age, and adolescents), and two severity groups (hypertensive urgency and hypertensive emergency). BP levels, etiology, severity, and clinical manifestations were analyzed by age group and compared between the hypertensive emergency and hypertensive urgency groups.The mean systolic/diastolic BP in the hypertensive crisis patients was 161/102 mmHg. The major causes of hypertensive crisis were essential hypertension, renal disorders and endocrine/metabolic disorders. Half of all patients had a single underlying cause, and 8 had a combination of underlying causes. Headache was the most common symptom (54.5%), followed by dizziness (45.5%), nausea/vomiting (36.4%) and chest pain (29.1%). A family history of hypertension was a significant predictive factor for the older patients with hypertensive crisis. Clinical manifestations and severity showed a positive correlation with age. In contrast to diastolic BP, systolic BP showed a significant trend in the older children.Primary clinicians should pay attention to the pediatric patients who present with elevated blood pressure and related clinical hypertensive symptoms, especially headache, nausea/vomiting, and altered consciousness which may indicate that appropriate and immediate antihypertensive medications are necessary to prevent further damage.It has been demonstrated that high blood pressure (BP) contributes to the early development of cardiovascular structural and functional changes in children [1,2]. With increasingly high BP, autoregulation eventually fails, leading to damage of the vascular wall and further organ hypoperfusion. Hypertensive crisis is a critical condition characterized by a rapid, inappropriate and symptomatic elevated BP, and is categorized as hypertensiv
Impulsive control of stochastic system under the sense of stochastic asymptotical stability

Niu Yu-Jun,Ma Ge,

中国物理 B , 2010,
Abstract: This paper studies the stochastic asymptotical stability of stochastic impulsive differential equations, and establishes a comparison theory to ensure the trivial solution's stochastic asymptotical stability. From the comparison theory, it can find out whether the stochastic impulsive differential system is stable just by studying the stability of a deterministic comparison system. As a general application of this theory, it controls the chaos of stochastic Lü system using impulsive control method, and numerical simulations are employed to verify the feasibility of this method.
Density Functional Theory Studies of Magnetically Confined Fermi Gas
Yu-Jun Chen,H. R. Ma
Physics , 2001, DOI: 10.1088/0256-307X/18/1/312
Abstract: A theory is developed for magnetically confined Fermi gas at low temperature based on the density functional theory. The theory is illustrated by numerical calculation of density distributions of Fermi atoms $^{40}$K with parameters according to DeMarco and Jin's experiment[Science, 285(1999)1703]. Our results are in good agreement with the experiment. To check the theory, we also performed calculations using our theory at high temperature and compared very well to the result of classical limit.
Can a half-metallic zincblende-type structure be stabilized via epitaxy?
Yu-Jun Zhao,Alex Zunger
Physics , 2004,
Abstract: The need for spin-injectors having the same zincblende-type crystal structure as conventional semiconductor substrates has created significant interests in theoretical predictions of possible metastable ``half-metallic'' zincblende ferromagnets, which are normally more stable in other structure-types, e.g., NiAs. Such predictions were based in the past on differences $\Delta_{\rm bulk}$ in the total-energies of the respective {\em bulk} crystal forms (zincblende and NiAs). We show here that the appropriate criterion is comparing difference $\Delta_{\rm epi}(a_s)$ in {\em epitaxial} total-energies. This reveals that even if $\Delta_{\rm bulk}$ is small, still for MnAs, CrSb, CrAs, CrTe, $\Delta_{\rm epi}(a_s) > 0$ for all substrate lattice constant $a_s$, so the zincblende phase is not stabilized. For CrS we find $\Delta_{\rm epi}(a_s) <0$, but the system is antiferromagnetic, thus not half-metallic. Finally, zincblende CrSe is predicted to be epitaxially stable for $a_s > 6.2$ \AA\ and half-metallic.
The association between serum adhesion molecules and outcome in acute spontaneous intracerebral hemorrhage
Hung-Chen Wang, Wei-Che Lin, Yu-Jun Lin, Cheng-Shyuan Rau, Tsung-Han Lee, Wen-Neng Chang, Nai-Wen Tsai, Ben-Chung Cheng, Chia-Te Kung, Cheng-Hsien Lu
Critical Care , 2011, DOI: 10.1186/cc10568
Abstract: Two hundred and thirty-nine blood samples were collected from 60 consecutive patients admitted within 24 hours after onset of spontaneous ICH and 60 blood samples were collected from 60 volunteers. Additional samples were obtained on Days 4, 7, 10, and 14 after onset of ICH regardless of clinical deterioration.Upon discharge, the therapeutic outcomes of the 60 spontaneous ICH cases based on the modified Rankin Disability Scale (mMRS) showed that 17 had no disability while 8.3% developed delayed cerebral infarction (DCI). Statistical analysis of adhesion molecules between patient groups with good outcome (mMRS = 0 or 1) and poor outcome (mMRS ≥2) revealed significant differences in diabetes mellitus (P=0.049), hyperlipidemia (P=0.012), mentality change (P=0.043), ICH volume and intraventricular hemorrhage on admission (P=0.036 and 0.006, respectively), Glasgow Coma Scale (GCS) on admission (P≤0.001), neuro-surgical intervention (P=0.003), and sE-selectin and soluble intercellular cell adhesion-molecule-1 (sICAM-1) levels on admission (P=0.036 and 0.019, respectively). Multiple logistic regression analysis of these significant variables showed that GCS on admission, hyperlipidemia, and sICAM-1 (P=0.039, 0.042, and 0.022, respectively) were independently associated with outcome of acute spontaneous ICH.Increased sICAM-1 and sE-selectin levels may imply poor therapeutic outcomes for the treatment of spontaneous ICH during hospitalization. These early inflammatory responses may cause whole-brain injury immediately after spontaneous ICH and offer a potential therapeutic target for such patients. The importance of these findings is that they offer a potential therapeutic target for patients with spontaneous ICH.Spontaneous intracerebral hemorrhage (ICH) is a fatal stroke subtype that accounts for 10% to 15% of all strokes. Its morbidity and mortality rates are among the highest, leaving individuals who survive with lasting disabilities [1-3]. Although ICH is a relatively c
Influence of Land Use/Cover Change on Soil Surface Erosion/Deposition Process: Evidence from 137Cs as A Tracer

PAN Xing-hui,ZHANG Chun-lai,WANG Sheng-tang,YANG Shuo,CHANG Chun-ping,QIU Yu-jun,
,张春来,王升堂,杨 硕,常春平,邱玉珺

中国沙漠 , 2007,
Abstract: Land use/cover changes affect both redistribution of 137Cs inventory and 137Cs depth distribution in soil profile.Redistribution of 137Cs inventory of several main types of land use/cover in Bashang region of Hebei province indicated that the region was in a wind erosion environment,where current agricultural land and deserted arable land are land use types suffering from the most serious wind erosion.137Cs depth distribution denoted the conversion of soil erosion/deposition by wind in the process of land use/cover change,which proved the significance of vegetation restoration by afforesting or planting grass on the current agricultural land in stead of further cultivation for wind erosion control and eco-environmental improvement.The results suggested that the process of land use/cover change should be fully considered in estimating soil erosion/deposition rates using 137Cs as a tracer.
Potential Risk of Malposition of Nasogastric Tube Using Nose-Ear-Xiphoid Measurement
Yen-Chun Chen, Lien-Yen Wang, Yu-Jun Chang, Chao-Pin Yang, Tsung-Ju Wu, Fung-Ru Lin, Sen-Yung Liu, Ta-Sen Wei
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0088046
Abstract: Background Correct placement of nasogastric tubes provide proper functionality and maximize benefit and minimize risk. The Nose-Ear-Xiphoid (NEX) body surface estimate method is a long-lasting technique, and this study was conducted to evaluate the correlation between NEX method and the secure insertion depth of nasogastric tube. Materials and Methods Thirty patients with nasogastric tube insertion who received whole body positron emission tomography with computerized tomography scan (PET-CT) were recruited. All data were gathered in the image center, which included Nose-Ear (NE), Ear-Xiphoid (EX), Nose-Ear-Xiphoid (NEX), glabella-xiphoid (GX) and glabella-umbilicus (GU) lengths. The distances of the inserted portion of the nasogastric tube between the cardiac and the nostril were measured by multiplanar reconstruction algorithm. Results Only one patient successfully placed all side-holes into the stomach while using NEX method to estimate inserting depth. Twenty-nine patients (96.7%) failed to place correctly. Fourteen participants had one or more side-holes in both the esophagus and the stomach sides. Fifteen patients could not pass through any side-hole across the gastroesophageal junction. They had shorter EX distances (p = 0.02), but no difference among the NE distances. Body height had the highest statistical correlation with nasogastric tube length (adjusted R2 = 0.459), as compared with the NEX, GX and GU body surface methods. Conclusion This study suggests that NEX method is inappropriate for adult patients to estimate the ideal inserting length of nasogastric tube. Physicians should realize these underinsertions with any side-hole above the gastroesophageal junctions may increase the potential risk of complications.
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