Instructional design,facilitation, and perceived learning outcomes: an exploratory case study of a human trafficking MOOC for attitudinal change     

Sunnie Lee Watson  Jamie Loizzo  William R. Watson  Chad Mueller  Jieun Lim  Peggy A. Ertmer 《Educational technology research and development : ETR & D》2016,64(6):1273-1300

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Promoting socially shared metacognitive regulation in collaborative project-based learning: a framework for the design of structured guidance     

Dongho Kim  Cheolil Lim 《Teaching in Higher Education》2018,23(2):194-211

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Stress analysis of anisotropic thick laminates in cylindrical bending using a semi-analytical approach   总被引：1，自引：0，他引：1  

LU Chao-feng LIM C.W. XU Feng 《浙江大学学报(A卷英文版)》2007,8(11):1740-1745

Semi-analytical elasticity solutions for bending of angle-ply laminates in cylindrical bending are presented using the state-space-based differential quadrature method (SSDQM). Partial differential state equation is derived from the basic equations of elasticity based on the state space concept. Then, the differential quadrature (DQ) technique is introduced to discretize the longitu- dinal domain of the plate so that a series of ordinary differential state equations are obtained at the discrete points. Meanwhile, the edge constrained conditions are handled directly using the stress and displacement components without the Saint-Venant principle. The thickness domain is solved analytically based on the state space formalism along with the continuity conditions at interfaces. The present method is validated by comparing the results to the exact solutions of Pagano’s problem. Numerical results for fully clamped thick laminates are presented, and the influences of ply angle on stress distributions are discussed.  相似文献   

“Those Who Can,Teach” ‐ The Pivotal Role of the Teacher in the Information and Communication Technologies (ICT) Learning Environment     

Cher Ping Lim  Sally Barnes 《Learning, Media and Technology》2002,27(1-2):19-40

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Mixing enhancement in microfluidic channel with a constriction under periodic electro-osmotic flow     

Chun Yee Lim  Yee Cheong Lam    Chun Yang 《Biomicrofluidics》2010,4(1)

We present a new approach to enhance mixing in T-type micromixers by introducing a constriction in the microchannel under periodic electro-osmotic flow. Two sinusoidal ac electric fields with 180° phase difference and similar dc bias are applied at the two inlets. The out of phase ac electric field induces oscillation of fluid interface at the junction of the two inlet channels and the constriction. Due to the constriction introduced at the junction, fluids from these two inlets form alternative plugs at the constricted channel. These plugs of fluids radiate downstream from the constriction into the large channel and form alternate thin crescent-shaped layers of fluids. These crescent-shaped layers of fluids increase tremendously the contact surface area between the two streams of fluid and thus enhance significantly the mixing efficiency. Experimental results and mixing mechanism analysis show that amplitude and frequency of the ac electric field and the length of the constriction govern the mixing efficiency.  相似文献   

An optofluidic volume refractometer using Fabry�CP��rot resonator with tunable liquid microlenses     

L. K. Chin  A. Q. Liu  C. S. Lim  C. L. Lin  T. C. Ayi    P. H. Yap 《Biomicrofluidics》2010,4(2)

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An Automated Item Pool Assembly Framework for Maximizing Item Utilization for CAT     

Hwanggyu Lim  Kyung T. Han 《Educational Measurement》2024,43(1):39-51

Computerized adaptive testing (CAT) has gained deserved popularity in the administration of educational and professional assessments, but continues to face test security challenges. To ensure sustained quality assurance and testing integrity, it is imperative to establish and maintain multiple stable item pools that are consistent in terms of psychometric characteristics and content specifications. This study introduces the Honeycomb Pool Assembly (HPA) framework, an innovative solution for the construction of multiple parallel item pools for CAT that maximizes item utilization in the item bank. The HPA framework comprises two stages—cell assembly and pool assembly—and uses a mixed integer programming modeling approach. An empirical study demonstrated HPA's effectiveness in creating a large number of parallel pools using a real-world high-stakes CAT assessment item bank. The HPA framework offers several advantages, including (a) simultaneous creation of multiple parallel pools, (b) simplification of item pool maintenance, and (c) flexibility in establishing statistical and operational constraints. Moreover, it can help testing organizations efficiently manage and monitor the health of their item banks. Thus, the HPA framework is expected to be a valuable tool for testing professionals and organizations to address test security challenges and maintain the integrity of high-stakes CAT assessments.  相似文献   

Cultural and linguistic diversity in early childhood teacher preparation: The impact of contextual characteristics on coursework and practica   总被引：1，自引：0，他引：1  

Chih-Ing Lim  Kelly L. Maxwell  Harriet Able-Boone  Catherine R. Zimmer 《Early childhood research quarterly》2009

The population of children in early childhood settings is becoming increasingly culturally and linguistically diverse, and these changes in demographics have warranted teachers becoming more culturally responsive and better prepared to work with diverse young children and families. Teacher preparation programs across the nation have responded differently to this critical issue, in part because of the different contexts in which they exist. Analyses were conducted using data from the National Prekindergarten Center’s (NPC) National Study of Early Childhood Teacher Preparation Programs and the National Center for Educational Statistics (NCES) Integrated Post-Secondary Education Dataset (IPEDS). Geographical, program, and institutional characteristics were analyzed from a sample of 416 Bachelor’s degree programs to determine how these variables were associated with the amount of diversity content and experience required in teacher preparation programs. Results indicated that the presence of non-White full-time faculty was positively related to more required coursework focused on working with children and families from culturally diverse backgrounds, while degree of urbanization, governance of institutions, and National Council for Accreditation of Teacher Education accreditation were associated with required coursework focused on working with bilingual children and English language learners. The percentage of the non-Hispanic White population in a state and geographic region were both associated with practica requirements focused on working with bilingual children and English language learners. Implications and recommendations for policy, future research, and early childhood teacher preparation are discussed.  相似文献   

Implementation of phase controlled impact device for enhancement of frequency response function in operational modal testing     

H.C. Lim  Zhi Chao Ong  A. Brandt 《Journal of The Franklin Institute》2018,355(1):291-313

This paper studies how to enhance frequency response function (FRF) estimation in the presence of harmonic disturbances during operational modal testing. A novel technique which utilizes impact-synchronous time averaging (ISTA) called impact-synchronous modal analysis (ISMA) was introduced where modal analysis can be performed in the presence of ambient forces. The phase angle information of the harmonic signal at the impact events is shown to be a key factor in enhancing the effectiveness of this technique. However, lack of knowledge and control of impact with respect to the phase angle of the disturbances using conventional impact hammer in ISMA has limited the effectiveness and practicality of this novel technique. A portable and automated phase controlled impact device is introduced in the effort to eliminate non-synchronous components with minimal possible impacts applied. This device makes use of the feeding phase angle information of responses from the cyclic load back to the device and imparts the impact at the correct time/phase which is always non-synchronous with respect to the phase of response from cyclic load. A reduced number of averages thereby expedite the overall modal testing procedure, an improved of FRF estimation and a good correlation of modal extraction data with benchmark data shown in this study has highlighted the advantages of ISTA using the proposed device.  相似文献   

The Political Transformation of Golf in Modern South Korea     

Youngsam Lim  Gwang Ok 《国际体育史杂志》2018,35(12-13):1254-1275

Abstract

Since golf was introduced to South Korea in the early 1900s, it has been strongly influenced by the politics that reflects socio-political contexts. Therefore, it is important to explore the political influences of golf on the context of its socio-political transformation. In this study, we explored how social and political backgrounds under each of the political administrations have affected the development of golf in South Korea. For this purpose, we utilized the socio-historical approach through document analysis to summarize the golf-related policy stances of nine presidential administrations from the Syngman Rhee government (1948–1960) to Park Geun-hye government (2013–2017). As a result, the Syngman Rhee administration pursued the construction of golf courses to bolster national security. The military regimes of Park Chung-hee and Chun Doo-hwan constructed golf courses as a means of cementing support among military circles to establish political legitimacy, and also as a means of diplomacy. The Roh Tae-woo administration initiated a construction boom in golf courses to promote sports for all. The Kim Young-sam administration announced a ‘no golf’ stance, while Kim Dae-jung and Roh Moo-hyun-both of whom had roots in the opposition-strove to encourage golf as a means of embracing their conservative counterparts while also diluting their progressive and contrarian image. Lee Myung-bak included golf among the core strategic tourist industries, while his successor, Park Geun-hye, first prohibited public officers from playing golf before pivoting to a supportive stance later on in her administration.  相似文献