Temperature dependence of Mott transition in VO_2 and programmable critical temperature sensor

The temperature dependence of the Mott metal-insulator transition (MIT) is studied with a VO_2-based two-terminal device. When a constant voltage is applied to the device, an abrupt current jump is observed with temperature. With increasing applied voltages, the transition temperature of the MIT current jump decreases. We find a monoclinic and electronically correlated metal (MCM) phase between the abrupt current jump and the structural phase transition (SPT). After the transition from insulator to metal, a linear increase in current (or conductivity) is shown with temperature until the current becomes a constant maximum value above T_{SPT}=68^oC. The SPT is confirmed by micro-Raman spectroscopy measurements. Optical microscopy analysis reveals the absence of the local current path in micro scale in the VO_2 device. The current uniformly flows throughout the surface of the VO_2 film when the MIT occurs. This device can be used as a programmable critical temperature sensor.Comment: 4 pages, 3 figure

Speech intelligibility of the diastratic varieties of Philippine English

The rise of English globalization has prompted speech production variations that reveal the cultural and social backgrounds of the different speakers. However, intelligibility issues of the different varieties have also become a concern. Thus, the present study attempted to assess the intelligibility of Philippine English (PE) diastratic varieties’ speech recordings produced by local Cebuano speakers. Further, it aimed to specifically evaluate the speakers’ production differences, rate the intelligibility of the language varieties, and determine the effect of language variety on the listener-evaluators in terms of intelligibility and distraction ratings. Using an exploratory sequential mixed method design, the speech participants in this study were carefully chosen through multistage sampling first by social class and then by phonological variations. The three final sample speakers out of the initial eighteen were finally categorized as acrolect, mesolect, and basilect. The evaluating groups included English language users from the USA, the Philippines, Korea, and Thailand, and each group represented a region in Kachru’s concentric circle of the World Englishes model. The results identified acrolect as the most intelligible variety followed by mesolect. Basilect, on the other hand, was considered very distracting to the evaluator groups, resulting in a significantly low intelligibility score. Thai evaluators gave the lowest intelligibility ratings, which may be attributed to two factors, L1 interference and unfamiliarity of L2 variation. Finally, future directions and implications in the classroom and industry are stated to create a sense of cultural awareness and to promote a deeper intercultural understanding that comes with international intelligibility

A randomized, open-label study comparing low-dose clevudine plus adefovir combination therapy with clevudine monotherapy in naïve chronic hepatitis B patients

PURPOSE: Clevudine 30 mg showed potent antiviral activity with a marked post-treatment antiviral effect. However, long-term treatment with clevudine monotherapy induced resistance and myopathy in some cases. The objective of this study is to evaluate the preliminary efficacy and safety of the combination of clevudine 20 mg and adefovir compared to clevudine monotherapy. METHODS: Seventy-four patients were randomized to either a combination of clevudine 20 mg and adefovir or clevudine 20 or 30 mg and were treated for 2 years. The viral kinetics for 24 weeks, virological response [VR; hepatitis B virus (HBV) DNA less than 300 copies/ml], and the biochemical response [BR; normal alanine aminotransferase (ALT)] were assessed. RESULTS: There was no difference in baseline characteristics among the three groups. Viral kinetics study showed no statistically significant difference among them during 24 weeks. The combination group showed 95 % virological response with a statistically significant difference compared to the clevudine 30 mg (67 %) and 20 mg (71 %) groups (p = 0.0376). Biochemical response rates were similar in all groups (78–94 %). No resistance was reported in the combination group, while 20 % of patients treated with clevudine 30 mg or 20 mg reported resistance during 2 years. Muscle-related symptoms such as myalgia (1 in clevudine 30 mg, 1 in the combination group) and muscle weakness (1 in clevudine 30 mg, 2 in clevudine 20 mg) were reported in five patients (7 %); of these, three patients discontinued the study. CONCLUSION: We concluded that the combination of clevudine 20 mg and adefovir produced a potent antiviral response together with a good resistance profile compared to clevudine monotherapy at 96 weeks in this pilot study

A diachronic study of code-switching patterns in the language of a third culture Filipino kid in Korea

Code-switching has been of immense interest in bilingualism for decades, and most previous studies present different code-switching functions in the language of bilinguals. However, a diachronic exploration of code-switching patterns in young polyglots’ production is a road less ventured. The present study follows the three-year language development of a Filipino third culture kid (living in a culture other than their parents’) in Korea from when he was 5;5 to 8;5 years old. Discourse analyses and hours of ethnographic observation through audio/video recordings expose a substantial shift of code-switching patterns across the three stages of language development. Significant changes can be observed explicitly in code-switching as referential function, addressee specification, and cross-cultural solidarity. The current investigation proposes that there is a diachronic change in the patterns of code-switching when a child’s new language develops, and the results resonate with the argument that code-switching is used for increasingly sophisticated purposes to manifest multicompetence, behavior transformation, and identity change when a certain level of communicative fluency is reached. Finally, the study provides useful insights toward a cross-cultural understanding of the dynamic interplay of code-switching and multicultural kids’ language in a pluralistic community

Intrapulmonary Cystic Lymphangioma in a 2-month-old Infant

Lymphangioma is an abnormal collection of lymphatics that are developmentally isolated from the normal lymphatic system. Lymphangioma rarely presents as a solitary pulmonary lesion. We report a rare case of intrapulmonary cystic lymphangioma involving the upper lobe of the right lung, which presented with dyspnea in a 2-month-old infant. High-resolution computed tomography (HRCT) of the chest demonstrated a well-circumscribed, multiseptate, cystic lesion in the upper lobe of the right lung, mimicking the feature of type I congenital cystic adenomatoid malformation. The tumor was removed by bilobectomy of the upper and middle lobes of the right lung, and its pathologic examination confirmed the diagnosis of an intrapulmonary cystic lymphangioma