Tera Autotech Corporation and National Changhua University of Education | Date: 2016-03-11
A band saw machine includes a working platform, a cutting machine, a vertical displacement element causing the cutting machine to move vertically, a height sensor and a central processor. The working platform includes a reference plane for placing a workpiece. The cutting machine includes a driving wheel, a driven wheel, a band saw wound on the driving wheel and the driven wheel, and a motor that electrically drives the driving wheel. The band saw includes a starting cutting tooth and a processing cutting tooth sequentially arranged. The height sensor detects a starting cutting point of the workpiece farthest from the reference plane. The central processor receives information of a position of the starting cutting point, and controls a displacement speed of the vertical displacement element and a first rotational speed of the motor to cause the starting cutting tooth to first cut at the starting cutting point.
YIN CHANGS INDUSTRY Corporation and National Changhua University of Education | Date: 2015-12-09
A curette for pituitary adenoma surgery may include a curette having a tubular blade portion. A first cutting edge is formed at a first end of the blade portion, and a protective shell is formed at an outer periphery of the first cutting edge. A first annular ring formed at a first end of the protective shell is located at the same side of the first cutting edge, and a rod portion extended from a surface of the protective shell is configured to provide a handhold for a user. The first annular ring of the protective shell can prevent the first cutting edge of the blade portion from accidentally cutting the meninges or blood vessels during pituitary adenoma surgery. Thus, the curette can improve the efficiency of the surgery and lower surgery time, anesthetic dosage and risk of the surgery.
Geann Industrial Co. and National Changhua University of Education | Date: 2016-08-22
A faucet apparatus with an ozonizer may comprise a faucet, a connecting unit, a bubbler and a control sleeve. An outer surface of the connecting unit has at least a first annular groove, and an elastic ring is disposed in the first annular groove. A first threaded segment is formed at a lower end of the connecting unit, and a bore penetrating through the outer surface of the connecting unit is located between the elastic ring and the first threaded segment. By turning the control sleeve to adjust the relative positions between the control sleeve and the connecting unit, the present invention is configured to prevent the control sleeve from being moved by water flow or airflow and to accurately control the use of the ozone thus improving the practicability thereof.
Huang C.,National Changhua University of Education
Cyberpsychology, Behavior, and Social Networking | Year: 2010
This meta-analysis examines the relationship between various Internet uses and measures of psychological well-being, including depression, loneliness, self-esteem, and life satisfaction. Forty studies represent a total sample of 21,258 participants and yield a data of 43 independent correlations. The mean correlation was -0.0504 for the fixed-effects model and r? =?-0.0385 for the random-effects model, indicating a small detrimental effect of Internet use on psychological well-being. According to the random-effects model, the effect of all moderators, including type of Internet use, indicator of well-being, quality of Internet use measure, and participant age and gender were insignificant. Since these moderators failed to explain the variation in the relationship between Internet use and psychological well-being, future investigations should consider the possible sources of these differences. Copyright 2010, Mary Ann Liebert, Inc.
Lee S.W.-Y.,National Changhua University of Education
Computers and Education | Year: 2013
The main purpose of this study was to understand the relationships between students' approaches to learning, their perceptions of online discussions, students' contributions in asynchronous discussions, and their academic performance. Two sets of questionnaires were used for understanding students' approaches of learning and perceptions of online discussions. The online postings from seven weeks of discussions were coded into three major categories: Initiation, Elaborated Response (ER), and Response with Resources (RWR). The results showed, first, some aspects of students' perceptions influenced the numbers of ERs and RWRs. Secondly, students' contributions to Initiation messages and RWR significantly related to deep motivation and deep strategies; however, the numbers of these two types of messages were negatively correlated to surface strategies. Finally, cluster analysis revealed three distinct groups who scored significantly different in almost all aspects of approaches to learning and perceptions of online discussions. Students in the cluster who adopted deep approaches and scored highest in the perception scales outperformed students in the other two clusters, both in terms of the number of ER messages and academic performance. Pedagogical implications for teaching with online discussions are discussed in this study. © 2013 Elsevier Ltd. All rights reserved.
Liu S.-H.,National Changhua University of Education
Computers and Education | Year: 2011
In Taiwan, teachers are expected to integrate technology into instruction with learner-centered beliefs; however, teacher beliefs and practices may differ. The contextual factors influencing this inconsistency must be identified. This study first examines the relationship between pedagogical beliefs of teachers and teaching activities, and further identifies differences between teacher beliefs and teaching activities of Taiwanese teachers in each factor associated with technology integration. In total, 1139 elementary school teachers filled out a set of questionnaires that collected information about teacher pedagogical beliefs, frequent teaching activities, and factors associated with technology integration. Chi-square test results reveal that most Taiwanese teachers held learner-centered belief, but did not integrate constructivist teaching with technology. This analytical result confirms the conflict between teacher beliefs and teaching activities. Two-way analysis of variance results demonstrate that external requests and student test scores were principal considerations for constructivist teachers. Constructivist teaching with technology to enhance student achievement should influence teacher beliefs and practices. The study recommends that future studies conduct a cross-nation comparison to elucidate the factors associated with technology integration in different cultural contexts. © 2010 Elsevier Ltd. All rights reserved.
Chang T.-Y.,National Changhua University of Education
Information Sciences | Year: 2012
It is well-known that the protection of long-lived private keys in cryptographic schemes is one of the most important issues for information security. Any cryptographic scheme that reveals private keys will soon have its security absolutely disintegrate. For example, in digital signature systems, anyone who obtains the victim's private key, authenticity and non-repudiation can no longer be claimed or proven. Because the private key is a long random bit string and should be stored securely, some special cryptographic hardware such as an IC (Integrated Circuit) card is needed to store and protect the private key. Unfortunately, the security of private keys solely depends on the vulnerable passwords. This study proposes combining a neural network technique and password keystroke features to dynamically generate a long-lived private key rather than statically stored in a storage unit. Compared with other traditional methods, even if the storage unit is lost or the password is revealed, the probability of exposing the private key is reduced. © 2012 Elsevier Inc. All rights reserved.
Juan Y.-L.,National Changhua University of Education
IEEE Transactions on Power Electronics | Year: 2011
In this paper, a novel ac/dc interface with an integrated controller is proposed for the microscale wind power generation system (WPGS). The proposed interface is mainly composed of a dynamic maximum power point tracking (MPPT) control and a half-controlled single-stage rectifier with an integrated control. The half-controlled single-stage rectifier is proposed to replace the widely used two-stage converter for improving the current total harmonics distortion (THD) as well as the efficiency. The analytic expressions of the duty ratios for controlling the rectifier are also derived. Moreover, the dynamic response of the wind turbine and the extracted wind power are enhanced by the integrated dynamic MPPT control. Finally, from the experimental results, it can be seen that the current THD is reduced to around 5, and the total efficiency is increased by about 1215 depending on the wind speed variations. © 2011 IEEE.
National Changhua University of Education and Feiloli Electronic Co. | Date: 2013-06-04
A boxing game machine includes a punch bag, a frame, a rocker, a catch, a latch and a spring. The rocker is pivotally connected to the frame between an idle position and an active position. The punch bag is secured to an end of the rocker. The catch is secured to another end of the cocker and formed with a radial edge. The latch is movably supported on the frame and formed with an edge for sliding into contact with radial edge of the catch so that the latch engages with the catch. The spring biases the latch into engagement with the catch to keep the rocker in the idle position.
National Changhua University of Education | Date: 2013-03-17
A through-silicon via self-routing circuit includes a plurality of through-silicon vias (TSVs) and a plurality of planar die. The plurality of planar die are connected by the plurality of TSVs. And each one of the plurality of planar die includes a built-in self-tester, a built-in self-routing switching network, and a core circuit. The built-in self-tester has a plurality of valid-bit leads and a plurality of through-silicon via leads to connect the plurality of TSVs. The built-in self-routing switching network is connected to the built-in self-tester, for selecting from the plurality of TSVs for conducting. The core circuit has a to plurality of I/O leads linked to the built-in self-routing switching network.