Browsing by Author "Chiu, CH"

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Design and implementation of IIPC locking facility
(1999)
Chang, YS
;
Yuan, SM
;
Chiao, HD
;
Chiu, CH
;
Tsay, WP
In the most of operating system or distributed operating system, Inter-Process Communication (IPC) is an important mechanism. Most existing IPC synchronization facilities provide only mutual exclusion type of semantic, which greatly reduces the parallelism of concurrent programs and decreases the performance. This paper proposes an intra- and inter-processes locking facility, which is a useful tool promoting the parallelism of concurrent programs. it contains two-level locking facility; the first level deals with thr ead's synchronization its the same process, and the second level handles thread's synchronization in different processes. Both are implemented in the form of DLL on the Windows NT. Beside, we compare the performance of this facility with Windows NT's synchronization objects. The result is obviously that IIPC locking facility has better performance than traditional synchronization objects.
Ferroelectric liquid crystalline polymers based on mesogens with halogen-containing terminal groups
(2003-01-01)
Sha, YA
;
Hsiue, GH
;
Chiu, CH
;
Jeng, RJ
;
Tai, HC
A new series of halogen-containing side chain ferroelectric liquid crystal polymers was synthesized. Mesophases were characterized by differential scanning calorimetry, polarizing optical microscopy. X-ray diffraction and molecular simulation. The behaviour of the liquid crystalline phase was investigated with variation of chiral centres. spacer units and grafted ratios. It was found that the thermal stability and temperature range of the chiral smectic C phase decreased with increasing length of the oligo-oxyethylene spacer. and decreasing mesogenic group content. The bulky substituent attached to the chiral centre reduces molecular packing in smectic liquid crystal phases, which disturbs the orientation of the side chain liquid crystal polymer. Furthermore, the influence of molecular structure on electro-optical properties of FLCPs has been studied by broad band dielectric spectroscopy (from 0.1 to 1 x 10(6) Hz).
Microstructural characterization and phase development at the interface between aluminum nitride and titanium after annealing at 1300 degrees-1500 degrees C
(2006-04-01)
Chiu, CH
;
Lin, CC
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材料科學與工程學系
;
Department of Materials Science and Engineering
Diffusion couples of aluminum nitride (AlN) and Ti were annealed under an argon atmosphere at temperatures ranging from 1300 degrees to 1500 degrees C for 0.5-36 h. The morphologies, crystal structures, and chemical compositions of the reaction zones at AlN/Ti interfaces were characterized using analytical scanning electron microscopy and analytical transmission electron microscopy. An interfacial reaction zone, consisting of TiN, tau(2)-Ti2AlN, tau(1)-Ti3AlN, alpha(2)-Ti3Al, and a two-phase (alpha(2)-Ti3Al+alpha-Ti) region in sequence, was observed in between AlN and Ti after annealing at 1300 degrees C. The alpha(2)-Ti3Al region revealed equiaxed and elongated morphologies with [0001](equiaxed)//[1100](elongated) and (1010)(equiaxed)//(1122)(elongated). In the two-phase (alpha(2)-Ti3Al+alpha-Ti) region, alpha(2)-Ti3Al and alpha-Ti were found to satisfy the following orientation relationship: [0001](alpha-Ti)//[0001](Ti3Al) and (1100)(alpha-Ti)//(1100)(Ti3Al). The gamma-TiAl and a lamellar two-phase (gamma-TiAl+alpha(2)-Ti3Al) structure, instead of tau(1)-Ti3AlN, were found in between tau(2)-Ti2AlN and alpha(2)-Ti3Al after annealing at 1400 degrees C. The orientation relationship of gamma-TiAl and alpha(2)-Ti3Al in the lamellar structure was identified to be as follows: [011](TiAL)//[2110](Ti3Al) and (111)(TiAl)//(010)(Ti3Al). Compared with the reaction zone after annealing at 1400 degrees C, the gamma-TiAl was not found at the interface after annealing at 1500 degrees C. The microstructural development resulting from isothermal diffusion at 1300 degrees C and subsequent cooling at the interface are explained with the aid of the Ti-Al-N ternary phase diagram and a modified Ti-Al binary phase diagram.
Nanoimprinting-lithography-induced self-aligned liquid crystals for novel multifunctional optical films
(2006-02-13)
Chiu, CH
;
Kuo, HL
;
Chen, PC
;
Wen, CH
;
Liu, YC
Polymerizable nematic liquid crystal (LC) was adopted as a resist for our newly developed nanoimprinting lithography process. Liquid crystal molecules were self-aligned during imprinting process without precoated alignment layer. The large patterned area was able to achieve 4x4 cm(2) at very low impriting pressure, 1.5 bar. The optical anisotropic was verified through polarized optical microscopy and the retardation was measured by polarized ultraviolet/visible spectrometer. The micrograted LC films prepared by this novel method offer the potential applications for a LC alignment layer within LC cells, as well as preparation of optical anisotropic films. (c) 2006 American Institute of Physics.
Student participation in computer science courses via the Network Peer Assessment System (NetPeas)
(1999)
Liu, EZF
;
Chiu, CH
;
Lin, SSJ
;
Yuan, SM
;
資訊工程學系
Students enrolling in computer science courses at National Chiao Tung University (Hsinchu, Taiwan) have responded positively to network peer assessment. This study adopts Internet resources to facilitate contact between individuals and information, assist in brainstorming, and generate a more meaningful learning at a higher education level.
Web-based Collaborative Homework Review System
(1998-01-01)
Chiu, CH
;
Wang, WR
;
Yuan, SM
;
資訊工程學系
;
Department of Computer Science
This paper is based on the concept of "Learning by Judging" to design a "Collaborative Homework Review Modal", then we use this modal to construct a "Collaborative Homework Review System" on World Wide Web. In this Modal, students turn in homework through network; get score and suggestions through peer review of students, and then the author of each homework edit their work according to the suggestions. After several rounds then the teacher can grade the homework according to the evaluations of the students. In this way, teachers are playing the role similar to editor in chief of journals. All students are playing the role of authors and reviewers. We hope that this would help students to develop skills for high level thinking and knowledge presentations.
Web-based Collaborative Homework Review System
(1998-01-01)
Chiu, CH
;
Wang, WR
;
Yuan, SM
;
資訊工程學系
;
Department of Computer Science
This paper is based on the concept of "Learning by Judging" to design a "Collaborative Homework Review Modal", then we use this modal to construct a "Collaborative Homework Review System" on World Wide Web. In this Modal, students turn in homework through network; get score and suggestions through peer review of students, and then the author of each homework edit their work according to the suggestions. After several rounds then the teacher can grade the homework according to the evaluations of the students. In this way, teachers are playing the role similar to editor in chief of journals. All students are playing the role of authors and reviewers. We hope that this would help students to develop skills for high level thinking and knowledge presentations.
Web-based peer review: The learner as both adapter and reviewer
(2001-08-01)
Liu, EZF
;
Lin, SSJ
;
Chiu, CH
;
Yuan, SM
;
師資培育中心
This study describes an effective web-based learning strategy, peer review, used by 143 computer science undergraduate students in an Operating Systems class at a Taiwanese university. Peer review, based on social constructivism, can be easily implemented via the authors' well-developed web-based peer review (WPR) system. Through peer review, the authors hope to form an authentic learning environment similar to an academic society in which a researcher submits a paper to a journal and receives reviews from society members before publication. Students using this learning strategy are expected to develop higher level thinking skills. The WPR system functioned in the following roles in this study: 1) an information distribution channel and management center for assignment submissions and peer review; 2) a forum for peer interaction and knowledge construction; and 3) storage for knowledge construction procedures. An evaluation of learning effects and students' perceptions about peer review during the spring of 1998 revealed that students not only performed better under peer review, but also displayed higher level thinking skills, i.e., critical thinking, planning, monitoring, and regulation. Students perceived peer review as an effective strategy that promoted their learning motivation. However, merely being an effective reviewer or an effective author may not excel in a peer review environment. The most effective individual appears to be the strategic adapter who effectively constructs a project, adjusts to peers' comments, and serves as a critical reviewer as well.