THE REACH OF THE PARTY-STATE : ORGANIZING LOCAL POLITICS IN TAIWAN (CHINA)

KUO, JENG-LIANG JULIAN Yale University 1995 국내박사

Object recognition using tactile data

Shen, Jeng-tzong U.M.I. 1988 국내박사

On the feasibility of Chinese economic integration

Wu, Jeng-Dau Golden Gate University 1993 국내박사

Usability of the digital library: An evaluation model

Jeng, Judy H Rutgers The State University of New Jersey - New B 2006 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

The main research goal of this dissertation is to develop a model and a suite of instruments to evaluate the usability of academic digital libraries. Usability in this study was examined from the perspectives of effectiveness, efficiency, satisfaction, and learnability. The model that was developed considers both quantifying elements such as accuracy rate, time, and number of steps required to complete a task, and the subjective criterion, satisfaction, which is further broken down into the areas of ease of use, organization of information, terminology and labeling, visual appearance, content, and mistake recovery. The model was tested at two academic digital libraries. It is a cross-institutional usability study. The study recruited a total of forty-one subjects and was divided into two stages to confirm findings. The study examined the interlocking relationships among effectiveness, efficiency, and satisfaction. It found that the relationships are statistically significant. The longer the time it took for a subject to perform a task, the more steps involved. The greater the number of steps involved in completing a task, the lower the satisfaction expressed by the subject. The longer the time spent on completing a task, the lower the satisfaction expressed by the subject. However, it should be noted that each criterion has its own emphasis and should be measured separately. The research uncovered the user's criteria for ease of use, organization of information, terminology, visual attractiveness, and mistake recovery. The findings are helpful in enhancing the usability of the digital library. The issues of "user lostness" and navigation disorientation were examined, and the causes were identified. The study also examined the click cost issue. It found that 73% of the participants expected the click(s) to lead them eventually to the correct answer. Each click in the digital library should bring users closer to the answer. The study established that the demographic factors (gender, age, status, academic major, ethnic background, years at the institution, and frequency of using library Web sites) do not have a statistically significant impact on performance (i.e., effectiveness and efficiency). However, different attitudes among ethnic groups were found in rating satisfaction. Future research should recruit more subjects in each ethnic group to examine this cross-culture usability issue further.

Mutational analysis of gamma-tubulin

Jeng, Robert Leo Stanford University 2000 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

Microtubules compose one of the major eukaryotic cytoskeletal systems. An important aspect of their function is their organization within the cell, and a class of organelles called microtubule-organizing centers (MTOCs) serve as a major organizer of microtubules. These organelles influence the microtubule cytoskeleton by their ability to nucleate microtubules. The molecular mechanism of microtubule nucleation is unknown. γ-Tubulin has emerged as a central candidate for investigating microtubule nucleation. It is a member of the tubulin superfamily that is concentrated at microtubule-organizing centers. It is also a component of a ring-shaped structure in the cytoplasm. Studies have shown that this soluble complex is able to nucleate microtubules and disruption of γ-Tubulin leads to defects in microtubule organization. The <italic>Saccharomyces cerevisiae</italic> γ-tubulin is encoded by the <italic>TUB4</italic> gene. In order to learn more about the function of γ-Tubulin and its role in microtubule nucleation, a panel of <italic> tub4</italic> mutants was generated using error-prone polymerase chain reaction (PCR). 36 temperature-sensitive and 5 cold-sensitive mutants were isolated. Virtually all of the mutants showed defects in the microtubule cytoskeleton at the restrictive temperatures. The most predominant phenotype was the failure to establish bipolar mitotic spindles and the presence of extremely long cytoplasmic microtubules. Electron microscopy revealed that the spindle pole body structure and duplication appear normal, but one spindle pole body often had fewer microtubules eminating from it than the other. Interactions among the mutants were also detected. Four of the mutants displayed intragenic complementation in two complementation groups. The temperature sensitivity of the two mutants in one group was suppressed by the microtubule-destabilizing drug, benomyl. The amino acid changes in these four mutants were determined and mapped onto a predicted three-dimensional structure of Tub4p. The interactions of the human γ-Tubulin with two components of the soluble γ-tubulin complex, GCP2 and GCP3, were examined using a panel of alanine-scan γ-tubulin mutants. All three components were expressed in an insect cell expression system, and their binding was tested with immunoprecipitations. Expression was found to be highly variable with a large insoluble fraction. Nevertheless, two γ-Tubulin mutants were found which have altered binding to GCP2/GCP3.

Wavelet methodology for advanced nonparametric curve estimation: From confidence band to sharp adaptation

Jeng, Jenher University of California, Berkeley 2002 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

This dissertation research has been oriented by the goal of establishing the theoretical foundation of sharp-adaptation, which can be outlined in the sense of the questions as follow. (1) What is the nonparametric limit of estimating a curve, or recovering a signal from noise, under suitable smoothness regularization of the curve? (2) How do we break such a limit by structural assumptions, compatibly built over the classical minimax paradigm, on the properties of a curve in nonparametric estimation? (3) Can we characterize smoothness properties or patterns of a curve with feasible structural assumptions under general regularizations and estimate such characteristics sharply? (4) How confident are we about our assumptions and the estimates under them? In this article, we present some fundamental results and clues to these questions in the framework of a simple and highly extensible methodology for nonparametric curve estimation.

Intelligibility and acoustic characteristics of the dysarthria in Mandarin speakers with cerebral palsy

Jeng, Jing-Yi The University of Wisconsin - Madison 2000 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

The present study examined two aspects of speech deterioration associated with Mandarin-speaking adults with cerebral palsy (CP): intelligibility evaluation and speech acoustic analyses. Thirty young adults with CP participated in the study (10, spastic; 10, athetoid; 10, mixed). Ten age-matched speakers served as a control group. The speech materials included 78 Mandarin monosyllabic words and 10 sentences. The complete word list incorporated 17 phonetic contrasts (11 initial consonant, five rime, and one tone contrast). The three CP groups had low intelligibility scores across word, transcribed sentence, tDME (transformed direct magnitude estimation) sentence, and tone intelligibility, compared with normal speakers, but no significant differences were found among the CP groups. There were high correlations among word, transcribed sentence and tDME intelligibility. CP speakers had more consonant errors than vowels, and the most difficulty with the production of fricatives and affricates. The confusion error profile analysis showed that CP speakers had the highest error rates on C5 (retroflexed/nonretroflexed), C4 (fricatives/affricates) and V4 (alveolar final nasal/null final). The stepwise multiple regression analysis showed that contrast C1 (aspirated/unaspirated stops), C4 and V4 accounted for the majority of variability (74%) in word intelligibility. The spastic group had more manner of articulation confusions (stop/fricative/affricate), while the athetoid group had more consonant omissions. The discriminant analysis showed that 76.7% of the original grouped cases were correctly classified. The multidimensional scaling (MDS) procedure was employed to obtain the phoneme perceptual configuration for groups. CP speakers showed reduced contrast on most of the acoustic variables, such as VOT for aspiration, noise duration for fricatives/affricates distinction, M1 for retroflexion, A1 for nasalization, F2 for vowel advancement, F1 for tongue height and vowel space area. The acoustic variables were moderately correlated with intelligibility and confusion contrast variables. The stepwise multiple regression analysis showed that F2 differences and noise duration differences accounted for 63% of the variability in word intelligibility. The speech errors and acoustic contrast reduction conform with a ‘motor simplification principle’ for speech production of CP speakers. Language specific characteristics, such as the density of the phonetic inventory, may mediate the intelligibility evaluation.

DESIGN COORDINATION MODELING: A DISTRIBUTED COMPUTER ENVIRONMENT FOR MANAGING DESIGN ACTIVITIES (PROCESS MODELING)

JENG, TAYSHENG GEORGIA INSTITUTE OF TECHNOLOGY 1999 국내박사

Soft shadow visualization in synthetic scenes

Jeng, Elvis Ko-Yung City University of New York 2005 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

This dissertation presents two two-stage soft shadow visualization methods for area light sources. The first method, visualizing soft shadows for deformable moving area light sources, uses adaptively sampled shadow maps to allow viewers to rapidly modify the shape and the location of area light sources and visualize the changes of soft shadows in a synthetic scene. During the pre-processing stage, this method creates a shadow slab that represents intermediate shadow information for all light samples and a scene map that represents surface samples captured from a pre-defined viewpoint. To reduce storage cost, our importance-based adaptive sampling technique stores the shadow maps that form the shadow slab and the scene map in quad-trees, and only stores the fine details for essential areas. In the visualization stage, we update the attenuation map and screen buffer whenever light sources are modified in the light template by accessing the shadow slab and the scene map to provide rapid visual feedback. The second method, forward area light map projection, is suitable for arbitrary shape of area light sources. It projects sampled surface points (stored in a layered area light map) onto the viewing screen to rapidly generate high-quality soft shadow images. The preprocessing stage creates the layered area light map. The map is multi-layered since each map cell stores the visibility ratio (light attenuation value) of the area light source with respect to multiple surface points at various depths. In order to rapidly generate the final image in the soft shadow rendering stage, we forward project light attenuation values of surface points that are stored in the layered area light map onto the screen buffer to attenuate the shadowless reference image. This forward area light map projection renders images much faster than ray tracing and still results in soft shadows with comparable quality. In addition, we also present the "priority point lists for point-based object rendering" method. This method uses an adaptive sampling technique similar to the one introduced in the first method and the dynamic splatting technique introduced in the second method.

Comparing teachers' and parents' mental models for teaching hearing-impaired children to speak

Tzeng, Jeng-Yi Indiana University 2001 해외박사(DDOD)

소속기관이 구독 중이 아닌 경우 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

It is a common practice for special education teachers to train parents to teach their children with disabilities at home. However, the trainings effectiveness often puzzles teachers. Problems may result from the disparity between the teachers and the parents' mental models. These models are the schema-based internal representation of the event through which people interact while teaching. In a knowledge domain as complex as teaching, the mental model has been a concept that is discussed in the literature but rarely delineated. Using a combination of Minsky's (1975) theory of schema (frame) and Johnson-Laird's (1983) mental models as the theoretical framework, the present study intends to build and compare teachers and parents' mental models for teaching hearing-impaired children to speak. In the Children's Hearing Foundation in Taiwan, the teaching activities were videotaped for three teachers and three parents. Field observations, in-depth interviews and stimulated recalls were conducted. From the collected data, the teachers and parents' (a) global-level schema, (b) local-level schema, and (c) mental reasoning processes were identified and compared. The delineation of the teachers and the parents' mental models for teaching reveals how teaching behaviors are mediated by the “surrogate reality” that people form in their minds. The comparison indicates that teachers and parents' ingrained beliefs and attitudes not only formulate different teaching procedures that are operated by different reasoning logic, but also mediate the effectiveness of communication between teachers and parents. Implications of these differences are discussed along with suggestions for improving the effectiveness of communication where mental models are different.