Digital Module 08: Foundations of Operational Item Analysis https://ncme.elevate.commpartners.com

Item analysis is an integral part of operational test development and is typically conducted within two popular statistical frameworks: classical test theory (CTT) and item response theory (IRT). In this digital ITEMS module, Hanwook Yoo and Ronald K. Hambleton provide an accessible overview of operational item analysis approaches within these frameworks. They review the different stages of test development and associated item analyses to identify poorly performing items and effective item selection. Moreover, they walk through the computational and interpretational steps for CTT‐ and IRT‐based evaluation statistics using simulated data examples and review various graphical displays such as distractor response curves, item characteristic curves, and item information curves. The digital module contains sample data, Excel sheets with various templates and examples, diagnostic quiz questions, data‐based activities, curated resources, and a glossary.     

Effect of a dual inlet channel on cell loading in microfluidics

Unwanted sedimentation and attachment of a number of cells onto the bottom channel often occur on relatively large-scale inlets of conventional microfluidic channels as a result of gravity and fluid shear. Phenomena such as sedimentation have become recognized problems that can be overcome by performing microfluidic experiments properly, such as by calculating a meaningful output efficiency with respect to real input. Here, we present a dual-inlet design method for reducing cell loss at the inlet of channels by adding a new “ upstream inlet ” to a single main inlet design. The simple addition of an upstream inlet can create a vertically layered sheath flow prior to the main inlet for cell loading. The bottom layer flow plays a critical role in preventing the cells from attaching to the bottom of the channel entrance, resulting in a low possibility of cell sedimentation at the main channel entrance. To provide proof-of-concept validation, we applied our design to a microfabricated flow cytometer system (μFCS) and compared the cell counting efficiency of the proposed μFCS with that of the previous single-inlet μFCS and conventional FCS. We used human white blood cells and fluorescent microspheres to quantitatively evaluate the rate of cell sedimentation in the main inlet and to measure fluorescence sensitivity at the detection zone of the flow cytometer microchip. Generating a sheath flow as the bottom layer was meaningfully used to reduce the depth of field as well as the relative deviation of targets in the z-direction (compared to the x-y flow plane), leading to an increased counting sensitivity of fluorescent detection signals. Counting results using fluorescent microspheres showed both a 40% reduction in the rate of sedimentation and a 2-fold higher sensitivity in comparison with the single-inlet μFCS. The results of CD4⁺ T-cell counting also showed that the proposed design results in a 25% decrease in the rate of cell sedimentation and a 28% increase in sensitivity when compared to the single-inlet μFCS. This method is simple and easy to use in design, yet requires no additional time or cost in fabrication. Furthermore, we expect that this approach could potentially be helpful for calculating exact cell loading and counting efficiency for a small input number of cells, such as primary cells and rare cells, in microfluidic channel applications.     

The Diffusion of Disability Rights Policy: A Focus on Special Education in South Korea

This article examines the development of South Korean special education policy and suggests that different strategies of policy diffusion influenced the design of the policy at different times. Historically, South Korea relied on external pressures and influences, particularly US law and UN guidelines, to develop much of its human rights law, including special education. This article suggests that development of democratic infrastructure in South Korea led to improvements in the legislative development process in relation to current special education law, and this led to legislation that better identifies and addresses the needs of children with disabilities.     

Neural-network-based decentralized fault-tolerant control for a class of nonlinear large-scale systems with unknown time-delayed interaction faults

This paper proposes an adaptive approximation design for the decentralized fault-tolerant control for a class of nonlinear large-scale systems with unknown multiple time-delayed interaction faults. The magnitude and occurrence time of the multiple faults are unknown. The function approximation technique using neural networks is employed to adaptively compensate for the unknown time-delayed nonlinear effects and changes in model dynamics due to the faults. A decentralized memoryless adaptive fault-tolerant (AFT) control system is designed with prescribed performance bounds. Therefore, the proposed controller guarantees the transient performance of tracking errors at the moments when unexpected changes of system dynamics occur. The weights for neural networks and the bounds of residual approximation errors are estimated by using adaptive laws derived from the Lyapunov stability theorem. It is also proved that all tracking errors are preserved within the prescribed performance bounds. A simulation example is provided to illustrate the effectiveness of the proposed AFT control scheme.     

Robust event-driven tracking control with preassigned performance for uncertain input-quantized nonlinear pure-feedback systems

This paper presents a simplified design methodology for robust event-driven tracking control of uncertain nonlinear pure-feedback systems with input quantization. All nonlinearities and quantization parameters are assumed to be completely unknown. Different from the existing event-driven control approaches for systems with completely unknown nonlinearities, the main contribution of this paper is to design a simple event-based tracking scheme with preassigned performance, without the use of adaptive function approximators and adaptive mirror models. It is shown in the Lyapunov sense that the proposed event-driven low-complexity tracker consisting of nonlinearly transformed error surfaces and a triggering condition can achieve the preselected transient and steady-state performance of control errors in the presence of the input quantization.     

Working alliance as a mediator and moderator between expectations for counseling success and counseling outcome among Korean clients

The study examined client’s perceptions of working alliance as a mediator and moderator between client expectations of counseling success and counseling outcome. Participants were 284 adult clients in counseling in university or community counseling centers or private practices in South Korea. Level of functioning at the start of counseling was used to control for counseling outcome. Results of structural equation modeling analyses indicated that working alliance fully mediated the relationship between client expectations of counseling success and counseling outcome. In addition, moderation of counseling expectations by working alliance on counseling outcome was supported. Implications for research and practice are discussed.     

探讨运动强度对状态焦虑的影响

研究探讨一次性有氧运动对状态焦虑的影响。12名实验对象被分成3组分3天分别进行3个不同运动强度、即45％VO2peak，60％VO2peak，75％VO2peak的20min跑台实验。运动前后分别测试体温、血压和心理问卷测试。结果表明大强度的一次性运动(75％VO2peak)可有效地降低状态焦虑，其作用机制可能与体温的上升和中枢神经的内啡肽分泌增加有关。由于收缩压的降低随状态焦虑同步变化，建议收缩压可作为评价状态焦虑变化的生物学指标之一。     

Democratization during the transformative times and the role of popular education in the philippines and korea

Comparing popular education in the Philippines and South Korea, it is clear that a number of similarities and differences exist regarding the characteristics, methods, and main fields in which popular education has operated. ‘Church-related practices,’ ‘uniting with CO movements,’ ‘an eliteled tendency,’ and ‘a disregard for the Left’ have all occurred in similar ways in both countries. While introducing the socio-political situation during 1970s and 1980s of these two countries, this paper discusses the theories and practices of popular education. Our findings indicate how popular education in both countries has played a significant role in raising the levels consciousness in the powerless and transforming societies and enabled them to establish a better community. Moreover, each country developed different concepts, initiatives and methods in relation to popular education. In addition, popular educators have been asked to play different roles in each popular education field while most methods were in fact heavily dependent upon eliteled practices.     

An experience curve-based decision support model for prioritizing restoration needs of cultural heritage

Today's restoration and preservation of cultural heritage is an important task because of its historical significance, symbolism, and economic benefits. Decision makers or executors often encounter with taking decisions on which heritage is prioritized to be restored within the limited budget. However, very few tools are available to determine appropriately restoration priorities for the diverse historical heritages, perhaps because of a lack of systematized decision-making aids. This paper proposes an alternative decision support model to prioritize restoration needs within the executable budget. The model is constructed on stochastic analytic hierarchy process (S-AHP) and knowledge-based experience curve (EC); the former requires the input data to be random variables for interpreting probabilistically the ranks of the prioritized heritages and the latter reflects quantitatively the contribution of experts’ knowledge to weighting significant criteria in carrying out an assessment of restoration urgency. The application of 14 cultural heritages in Korea has been conducted, and the results are analyzed to illustrate the model's efficiency.