微机辅助设计机械产品装配图

本文提出一个在微机上设计机械产品装配图的方式。以Auto CAD为图形支持软件,利用其图形处理功能构成零件图子集,继而按装配要求形成草图,通过接口程序将图形信息转换成数字信息,求交、消隐后自动生成所需的产品装配图。     

《蒙古语谚语数据库》的建立与实现

谚语是人们对自然现象,社会现象长期观察的艺术总结;是用有节奏的语言,完整地表达广大劳动人民的斗争经验和思想感情,富有教育意义的民间语言。目前在谚语数据库中收录了1800个蒙古语谚语,并设计了一套管理系统。谚语供人们学习母语中的丰富词语和典范的表达形式。本文主要介绍了该系统所涉及的工作及意义,设计宗旨及其具体实践的过程。     

JJF-Z1型智能化1″光栅分度头的研制

本文介绍了如何应用微型计算机技术使1″光栅分度头本身智能化,再配置适当装置与IBM计算机联网,从而实现了角度及与角度相关的测量工作全部自动化。     

《微机接口技术》实验教学的改革与探索

针对《微机接口技术》课程特点,介绍了对其实验教学在内容、方法、考核上进行的一些改革与探索,旨在提高实践教学效果、加强对学生实践能力和创新能力的培养。     

After the ‘APIcalypse’: social media platforms and their fight against critical scholarly research

ABSTRACT

In the aftermath of the Cambridge Analytica controversy, social media platform providers such as Facebook and Twitter have severely restricted access to platform data via their Application Programming Interfaces (APIs). This has had a particularly critical effect on the ability of social media researchers to investigate phenomena such as abuse, hate speech, trolling, and disinformation campaigns, and to hold the platforms to account for the role that their affordances and policies might play in facilitating such dysfunction. Alternative data access frameworks, such as Facebook’s partnership with the controversial Social Science One initiative, represent an insufficient replacement for fully functional APIs, and the platform providers’ actions in responding to the Cambridge Analytica scandal raise suspicions that they have instrumentalised it to actively frustrate critical, independent, public interest scrutiny by scholars. Building on a critical review of Facebook’s public statements through its own platforms and the mainstream media, and of the scholarly responses these have drawn, this article outlines the societal implications of the ‘APIcalypse’, and reviews potential options for scholars in responding to it.     

Acquisition and Disclosure of Operational Information*

We study a firm's strategy for acquisition and disclosure of operational information by establishing linkages among information quality, managerial self‐interest, and production planning. We develop a multistage model in which a manager of a publicly traded firm first receives private information about the product demand and then uses it to make production and disclosure decisions. We consider two prevalent disclosure models employed in the accounting literature: all‐or‐nothing and cheap‐talk models. In the all‐or‐nothing model, it is assumed that any disclosure must be truthful, but the manager can strategically withhold information. We show that the manager commits to acquire the value‐added operational information if (i) the managerial self‐interest in the interim share price is low or (ii) the managerial self‐interest in the interim share price is high, but the fixed disclosure cost is either sufficiently low or sufficiently high. We demonstrate that the firm is better off if the production level is observable to the financial market because multidimensional signaling reduces costs. In the cheap‐talk model, we assume that the manager's disclosure may not be truthful. We show that the manager's incentive to acquire value‐added operational information increases along with the penalty cost for misleading investors. Therefore, a high penalty cost for misleading investors can encourage the manager to obtain more precise information, which in turn improves the firm's cash flow.     

Looking Inside Glitch Mitigation Capability: The Effect of Intraorganizational Communication Channels

Manufacturers can reduce the occurrence of glitches in their operations by building capabilities to prevent them, yet mitigation capabilities are also needed to contain the effects of the glitches that will still inevitably occur every now and then. We examine the glitch mitigation capability of a production process from an information‐processing perspective and propose that (i) the impact of operational glitches on delivery performance is contingent on the formalization of intrafirm communication channels and (ii) this effect is stronger when formal communication channels are complemented with informal channels. We test our model in a sample of 163 make‐to‐order production processes and find support for the first hypothesis and partial support for the second hypothesis. The statistical analyses also reveal nonhypothesized empirical regularities, which we explore through an additional qualitative study based on 34 site visits and 30 interviews with production planners. The results have practical implications for the design of intraorganizational communication channels, and they also contribute to the research on organizational resilience and communications by showing that when coping with disruptions, the formal communication channels have advantages that are seldom discussed in the literature or recognized by practitioners.     

Capacity Investment and Product Line Decisions of a Multiproduct Leader and a Focus Strategy Entrant

In this article, I investigate the capacity investment cost conditions where a multiproduct market leader may respond to a focus strategy entrant by using different strategies such as changing the product mix, production volumes, quality levels, and/or by investing in more capacity. The products offered in the market are quality differentiated and customers are heterogeneous in their willingness to pay for quality. The capacity investment costs of the two firms (i.e., the leader and the entrant) may also be different. The classical Stackelberg model predicts that an incumbent does not change its position in response to entry. However, when heterogeneous customer base, product differentiation, and capacity costs are taken into consideration, I find that the leader with a low capacity cost may choose to expand its product line and increase its production. The leader with low capacity cost may introduce a product that it was holding back when the entrant has to bear the high‐capacity cost and cannibalization threat is relatively small. Nevertheless, the extent of production volume strategies reduces as the capacity cost increases for the leader. I also find that when the leader has the power to set the industry standards by deciding the quality levels, as a response to a high‐quality focused entrant, the leader increases both levels of quality and production of the low‐quality product. Moreover, when the capacity investment cost is high for both the entrant and the leader, I find that market prices may increase with entry.     

浅谈机房网络故障维护

网络机房是现代实验教学中必不可少的教学条件,维护好网络,才能保证实验教学的顺利进行。本文针对机房常见的网络故障,结合笔者工作环境,通过实践总结出几种常易出现的问题及解决方法。     

I^2C总线技术在彩电中的应用

I^2C总结技术是目前大屏幕新型彩色电视机广泛采用的新技术，它使彩色电视机的电路结构发生了很大的变化。本文论述了I^2C总线控制系统的组成特点以及在新型彩色电视机中的应用。