AS/RS based yard and yard planning

In this paper, we apply the split-platform automated storage/retrieval systems （SP-AS/RSs） （Hu et al., 2005） to store containers in the yard to improve the yard performance and to increase the utilization of the yard space. The layout of an SP-AS/RS based yard is described in detail. To achieve an efficient operation, we present a novel yard space allocation policy called the ＇second-carrier-based allocation policy＇, which can help to alleviate the out-of-sequence problem of containers and the congestion of vehicles at the AS/RS racks. Different allocation policies are compared by an integrated container terminal simulation system. The simulation results show that the second-carrier-based policy is very efficient and has the potential to offer high terminal performance.     

集装箱码头出口箱交箱预约配额模型及启发式优化算法

针对集装箱码头出口箱交箱预约中的配额优化问题,根据不同出口装船船舶的不同截载期要求,提出了配额基于船舶和时间窗的二维定义,以集卡在堆场的平均等待时间最小为目标,构建了非线性整数规划模型;基于平稳到达的思想,设计了求解交箱预约配额优化问题的快速启发式优化算法。通过4组算例实验,证明了该算法的可行性;与平均算法的比较,提出的算法具有更高的效率,尤其在货运量增大和船舶大型化的趋势下,具有更加优越的适用性。     

A framework for ICT-enabled real-time production planning and control

This paper aims to develop a conceptual framework for real-time production planning and control（PPC）.Firstly,we discuss the most prominently applied contemporary information and communication technologies for PPC.Enterprise resource planning（ERP） systems that integrate the value chain in an enterprise,manufacturing execution systems that manage and control the production on shopfloor,and advanced planning and scheduling（APS）systems that develop solutions for complex planning problems are the planning and control systems that have been analyzed.We emphasize the application of radio frequency identification as the most advanced and promising emerging real-time data capture technology that is currently available to manufacturers.Having analyzed the features and shortcomings of the individual systems perse,and by considering the advantages that may be realized through effective integration of these otherwise discrete systems,we propose a framework for real-time PPC.     

A framework for planning a system of post-graduate courses

The place of post-graduate studies in the educational system is discussed with special reference to the need to produce highly trained high quality personnel capable of making a unique contribution to the development of a country's resources. In Latin America the training of post-graduates is almost always done in universities. The planning of a coherent system of post-graduate studies is therefore of great importance. Such plans must take into account national, regional and instititutional aspects of the problem. The legitimate aspirations of particular institutions must be respected but minimum conditions must be established and above all the efforts of individual institutions must be seen as part of a wider plan which seeks to match national and regional needs with the most productive use of scarce resources both human and financial. The post-graduate system in Argentina is described and some suggestions are made for its future development.     

一般压力容器事故及其分析

本文对一般压力容器出现的因设计有误、强度不足、焊缝质量低劣、运行管理不规范等发生的事故及原因进行了综合分析.目的在于为从事压力容器设计、制造和操作管理者提供一些经验和教训,并尽可能的防止和杜绝该类事故的发生与重演.     

Distributed Leadership for ICT Reform in Singapore

This study examines distributed leadership in Information Communication Technology reform in a government school in Singapore. The study adopts a naturalistic inquiry approach, drawing upon a case study of the aforementioned school for much of its data. The study found that leadership for Information Communication Technology reform is distributed according to functions of transformational leadership, instructional leadership, emotional leadership, and the strategic management of resources. The key enabling factors are an official leadership position, access to expertise, support by senior management, and interpersonal synergies among the leaders. Senior management consistently performs transformational leadership, whereas middle management generally performs instructional leadership. Both senior and middle management provide emotional leadership.     

Distributed leadership for personalized learning

Abstract

Personalized learning refers to a collection of practices designed to place student interests and needs at the heart of schooling. Schools that implement personalized learning need leaders that support educators and students in redesigning the core practices of teaching and learning in K-12 schools. To answer the question of how leaders support this redesign, we use distributed leadership theory to focus on the macrotasks and microtasks that leaders enact to create the conditions for personalized learning practices. Drawing on a five-year, qualitative study of 11 personalized learning programs in the Midwest, we identify three macrotasks supporting personalized learning: reorganizing learning environments to support student voice and choice, assembling idiosyncratic technology ecosystems to distribute teaching and learning tasks, and redesigning instructional time to prioritize student’s interests, agency, and learning relationships. After we describe a number of microtasks associated with each macrotask, we discuss how a consideration of these kinds of leadership tasks can open the contemporary discussion of personalized learning from a narrow focus on learning technologies to an expansive vision of student-centered school reform.     

A new framework for grading

Grading is one of the least liked, least understood and least considered aspects of teaching. After years of work, we have developed a grading system that is quite different from traditional and reformed approaches to grading and which meaningfully incorporates and integrates the collection of evidence, the evaluation of evidence, and the reporting of judgments about that evidence. This system satisfies the requirements of good grading system and answers many of the problems faced by more traditional methods by substantially changing the way in which grade information is aggregated, resulting in a final course grade that aligns qualitative evaluation with course learning objectives and carries direct qualitative meaning with respect to the course learning objectives.     

利用校园生态资源开展科技活动

我校校园内有亚热带植物园、果树园、桂花园、茶花园和樟树、榕树等，还有数个面积不等的池塘饲养着多种淡水鱼，一个标准的初级生态草坪、利用地底管道联系了池塘和草坪渗灌系统构成的水循环系统设备，玻璃温室和生物学试验田等，这些为校园生态资源的开发和利用提供了条件。我校生物学教师引导学生走出课堂去探索身边的生物学，经过一年多的探索实践，以科技实践活动为主要载体的校园生态资源的开发和利用有了初步的收获。     

A framework for sustainable mobile learning in schools

While there are studies that have looked at the implementation of mobile learning in educational institutions, particularly the identification of issues encountered, few studies have explored holistically the elements that sustain mobile learning. This study dissects the findings of a longitudinal study of a secondary school adopting a personal digital assistant programme and proposes a person‐centred sustainable model for mobile learning.     

Layer-layout-based heuristics for loading homogeneous items into a single container

The container loading problem (CLP) is a well-known NP-hard problem. Due to the computation complexity, heuristics is an often-sought approach. This article proposes two heuristics to pack homogeneous rectangular boxes into a single container. Both algorithms adopt the concept of building layers on one face of the container, but the first heuristic determines the layer face once for all, while the second treats the remaining container space as a reduced-sized container after one layer is loaded and, hence, selects the layer face dynamically. To handle the layout design problem at a layer's level, a block-based 2D packing procedure is also developed. Numerical studies demonstrate the efficiency of the heuristics.     

数字图书馆中基于本体的个性化推荐框架

为了提高数字图书馆信息服务的能力,描述了一个基于本体的用户浏览和搜索个性化推荐系统框架.该框架将本体的优点应用于检索周期中,包括提问相关测度、语义化的用户兴趣表达和自动更新、以及个性化的检索结果排序等.在用户访问数字图书馆的交互过程中,可通过本体来构造用户提问和文档内容的匹配机制以实现语义化的内容检索,并可进一步使用本体来构造用户兴趣偏好的概念向量以实现面向用户的个性化推荐反馈.