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Liu, Chieh-Wen,Liu, Chieh-I,Liang, C-T,Kim, Gil-Ho,Huang, C F,Hang, D R,Chang, Y H,Ritchie, D A Institute of Physics 2017 Semiconductor science and technology Vol.32 No.8
<P>Temperature-driven flow lines are studied in the conductivity plane in a GaAs-based two-dimensional electron system containing self-assembled InAs dots when Landau level filling factor <I>ν</I> = 2-4. In the insulator-quantum Hall (I-QH) transition resulting from the floating-up of the extended states, the flow diagram shows the critical behavior and we observed the expected semicircle in the strongest disorder case. By decreasing the effective disorder, we find that such flow lines can leave the I-QH regime and correspond to the plateau–plateau transition between <I>ν</I> = 4 and 2. The evolution of the conductivity curve at low magnetic fields demonstrates the importance of Landau-level mixing to the semicircle when the extended states float up.</P>
Tsai, Chieh-Ming,Song, Chan-Geun,Hung, Yung-Chieh,Jeong, Yong-Gi,Oh, Sung Hoon,Jeong, Joong Hoon,Kim, Huijin,Huh, Hoon,Yoon, Jong-Won,Sigmund, Wolfgang Elsevier 2017 CERAMICS INTERNATIONAL Vol.43 No.4
<P><B>Abstract</B></P> <P>Nanofibers of titania and composite nanofibers of titania and multiwall carbon nanotubes were synthesized by electrospinning using a sol-gel process combined with activated carbon nanotubes. The relationships of treatment temperature, carbon nanotube content on the crystal phase, fiber morphology, and electric properties are reported. It is found that the rutile phase becomes more prominent at low heat treatment temperatures with an increase of carbon content in nanofibers, be it for higher amount of carbon due to reducing atmosphere or due to an increase in MWCNT. Atmospheric control and lower heat treatment temperatures enable crystalline nanocomposite fibers of anatase where the level of rutile is below the detection limit of XRD or Raman spectroscopy. This work provides a new path to fabricate electrospun TiO<SUB>2</SUB>/MWCNT nanocomposite nanofibers with limited C-induced rutile phase.</P>
Chih-Chieh Hsu,He-Ping Chen,Wei-Chieh Ting 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2
was studied by using numerical simulations. The electrical characteristics of the triodes with V2O5 doping concentrations of 1016 − 1018 cm −3 and electrode work functions (WFs) of 4.4 − 5.1 eV were simulated. In addition, the corresponding physical mechanisms were investigated by quantitatively analyzing the energy band diagram, carrier distribution, injection and transports which were difficult to measure and obtain experimentally. The optimal triode performance was obtained for a doping concentration of V2O5 of 2 × 1017 cm −3 and WFs of the emitter and the collector electrodes of 5.1 eV and 4.8 eV, respectively. The simulation results were reasonable when compared with experimental data reported by other groups.
Endoscopic Ultrasound-Based Evaluation of Pancreatic Cysts: New Invasive Modalities
Chieh Sian Koo,Khek-Yu Ho 대한췌장담도학회 2022 대한췌담도학회지 Vol.27 No.4
Pancreatic cysts are a heterogenous group of lesions that can be differentiated into mucinous and non-mucinous cysts based on their malignant potential. Crosssectional imaging alone is inadequate to reliably distinguish between the two groups. Endoscopic ultrasound (EUS) and fine needle aspiration has been used for analysis of the cyst morphology and cyst fluid. Traditional markers such as fluid carcinoembryonic antigen and cytology have been useful particularly for the assessment of indeterminate cysts or those with high-risk features, but the overall diagnostic accuracy is still sub-par. As a result, new techniques have been described to improve the ability of EUS to risk stratify a pancreatic cyst. In this review, we describe some of the novel EUS‑based techniques in the evaluation of pancreatic cysts, namely needle-based confocal laser endomicroscopy, through the needle cystoscopy, and through the needle biopsy techniques.
Trough Melatonin Levels Differ between Early and Late Phases of Alzheimer Disease
Chieh-Hsin Lin,Chih-Chiang Chiu,Hsien-Yuan Lane 대한정신약물학회 2021 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.19 No.1
Objective: Melatonin has been considered to have an essential role in the pathophysiology of Alzheimer’s disease (AD) for its regulatory function on circadian rhythm and interaction with glutamate for the modulation of learning and memory. Previous studies revealed that melatonin levels decreased in patients with AD. However, melatonin supplement didn’t show promising efficacy for AD. This study compared trough melatonin levels among elderly people with different severities of cognitive deficits. Methods: We enrolled 270 elder individuals (consisting four groups: healthy elderly, amnestic mild cognitive impairment [MCI], mild AD, and moderate-severe AD) in the learning cohort. Trough melatonin levels in plasma were measured using ELISA. Cognitive function was evaluated by Clinical Dementia Rating Scale (CDR) and Mini-Mental State Examination (MMSE). An independent testing cohort, also consisting of four groups, was enrolled for ascertainment. Results: In the learning cohort, trough melatonin levels decreased in the MCI group but elevated in the mild and moderate to severe AD groups. Trough melatonin levels were associated with CDR and MMSE in MCI or AD patients significantly. In the testing cohort, the results were similar to those in the learning cohort. Conclusion: This study demonstrated that trough melatonin levels in the peripheral blood were decreased in MCI but increased with the severity of AD. The finding supports the trials indicating that melatonin showed efficacy only in MCI but not in AD. Whether trough melatonin level has potential to be a treatment response biomarker for AD, especially its early phase needs further studies.
Robust Control Design Based-on Integral Sliding-Mode for Systems with Norm-Bounded Uncertainties
Chieh-Chuan Feng,Yung-Yeh Lin 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
Based on the integral sliding-mode control that copes with norm-bounded matched uncertainties, a robust control of L₂-gain performance measure subsequently applied to the system is proposed to handle both nonlinearities and unmatched uncertainties. The similar issue through the use of higher order multimode model has been relaxed. Instead of using exact known multi-mode to express the uncertain system, the norm-bound convex set is a concise way of expressing the model and hence, higher order models needed in the computation can be avoided. In this paper integral sliding-mode control robustly nullifies the matched uncertainties from the first beginning of the process and then, once in the sliding mode, the nonlinearities and unmatched uncertainties are further compensated by the quadratic stability with L₂-gain performance measure to not only stabilize the system but also ensure the satisfaction of performance. The effectiveness is shown in a numerical example.
Die Welt der Sprache bei Herta Muller
( Chieh Chien ) 한국독어독문학회 2013 獨逸文學 Vol.128 No.-
Herta Muller verlisst sieh nieht auf die Spraehe. Dennoeh k.mn sic aueh niehl auf die Sprnehe verziehlen. In Wahrhdt ist sic suehtig nach der Sprnche. Threr Ansicht nach bekundet die Sprache zwei Wirklichkeiten: I. In diversen Spmch- und Kultuniiumen zeigen sich diverse Bilder und Wahmchmungcn; 2. Die politisierte bzw. verordnete Spraehe vemlag nieht nur die Humanitat zu entwlirdigen, sondem auch die Menschlichkeit zu vcrderben. Nach tiefgriindiger Auscinandersetzung mil beiden Wirklichkciten, \velche zu weiteren Erkenntnissen gefuhrt hat, entwickelt Herta Muller eine ihr eigene Art und Weise, Wahmehmungen zu erlinden. Die Besonderheit des Mullerschen Sprachstils lindel sieh insbesondere in ihren aus Papierfctzcn crstandcnen Collagcngedichten, in dcncn Texle und Bilder auf cine kontrnStive Weise einander ergjinzen. Es enlstcht nicht nur ein Bild-Text-Dialog, sondem die Iyrisehen Worlleile beziehen sich gewisserweise nuch inlerlexlucll auf ihre Herkunftstexte. DarUber hinaus bestehen zwischen Herta MUliers Gediehten, Romanen und Essays in vieler Hinsicht auch intertextuelle Zusammenhange. DiesbezUglich spiden die sieh in den genannlen Genres Uberlagemden Motive eine wcsentliche Rolle. Die Umersuchung geht zuerst auf die Mullersche Sprachaulfasslmg ein. Als Sehwerpwlkte stehen dann die Sinnzusammcnhange zwischcn Bild und Text in der Lyrik Herta Muliers sowie die Imertextualitlit ihrer Iiterarisehen Motive zur Debatte. Daraus lassen sieh als Letztcs die bahnbrochenden Zuge cler Spmche Herta MUliers ersehlielBen.