塑料薄膜柔性版印刷最佳混合加网技术研究

因传统调幅（AM）网点及调频（FM）网点在阶调表现上存在不足而产生了混合加网技术,即亮调区域和暗调区域使用FM网点、中间调使用AM网点。本研究为在柔性版印刷中获取最佳的混合网点组合配对,采用实验研究法,依据柯达Creo的Maxtone混合加网技术设计了11组不同的混合网点（FM-AM-FM）组合,利用柔性版印刷、混合加网技术及计算机直接制版技术在塑料薄膜上印刷导表,并进行测试。然后测量采用11组混合网点的印刷品之间质量特性的差异,经由统计分析得到FM-AM-FM阶调百分比优化组合为10%-75%-15%（0～10%为FM网点、10%～85%为AM网点、85%～100%为FM网点）。本研究结果将为柔性版印刷提供一个参考依据,既提升印刷质量又节省成本,并达到最高的顾客满意程度。     

调幅网加网因子研究

调幅式数字加网,由于各分色版的网点具有不同的网线角度,在确定原稿图像扫描输入分辨率时通常要乘以1．5～2．0的加网因子,这在业界已成定式。本文依据调幅网加网过程的原理分析和实验结果,查明加网因子源自RIP加网时原灰度图像的4个像素对应于加网图像的1个网格,与网线角度无关。采用加网因子可保留原图像较多的空间细节,提高加网图像的清晰度,并明确指出调幅网的加网因子应等于2。     

柔性版印刷中的混合加网技术

本课题通过研究柔版印刷中不同混合加网技术对印品质量的影响,获得了针对CTP制版柔版印刷的最优混合加网技术。实验采用了柔性版印刷中11种不同比例组合的混合加网技术（FMAM—FM）,在PVC基片上印制特别设计的色表。通过对色表的测试以及网点静态分析,以获得最优混合加网的组合。希望本实验得到的最优混合加网组合的数据能为柔性版印刷商更好地了解不同加网技术的特点提供帮助,通过选择加网技术提高印刷质量,获得更高的客户满意度。     

混合加网为印刷企业带来高质量

据加拿大RIPit公司称,该公司的PerfectBlend混合加网技术可为印刷企业提供吸收调幅和调频最大优势的混合加网技术—传统的调幅加网作用于大部分色调区域,而调频加网作用于高调及暗调区域。据用户报道,采用这种混合加网技术,加网线数可比调幅加网提高80%,且不会产生印刷故障。让我们看看一家成功用户的反馈。Creative Media是纽约一家小型商业印刷厂,9名员工同时也从事视频产品的生产、网络开发和图像设计。几年前,该公司购买了一台RIPit照排机用于输出胶片。据公司负责人Grado回忆,此前他们有一部Itek430制版机,用于生产Silvermaster…     

基于乘同余伪随机算法的调频加网效率研究

调频网点的生成体现随机性，其加网效率与多种因素相关。本文重点讨论乘同余伪随机算法生成调频网点的效率问题。首先介绍了伪随机算法用于调频加网生成网点的基本原理，在此基础上讨论了乘同余伪随机算法实现调频加网的方法机制，同时提出5种可用于调频网点生成的随机函数，并通过定量实验对5组乘同余伪随机函数生成随机数效率进行了讨论和研究。通过分析数据和曲线走势图，得出不同条件对加网效率的影响趋势，为调频加网用于印刷生产提供了理论参考。     

调频加网印刷和油墨

与依靠网点大小来表现图像层次的调幅加网不同,调频加网是依靠细微点的密度来表现图像层次的(见图1).20世纪90年代后期,热敏CTP得到普及,微细点可轻松地在其上表现,至此调频加网得到重视.     

月历

2007年10月18日杭州星都宾馆全球视方佳高保真调频网加网技术及印刷技术应用高峰论坛；2007年10月18-19日上海紫金山大酒店四楼紫金厅“科印杯”数码印刷作品大奖赛颁奖典礼；2007年10月25-26日西安东方大酒店2007全国书刊印后装订技术研讨会；2007年10月27-29日昆明国际会展中心2007首届（昆明）秋季印刷、包装设备展览会     

光栅印刷加网的打印优化研究

数字加网是指将连续调图像转换成由像素排列的图像的过程,使观察者产生一种连续调图像的错觉。光栅印刷加网是将组成柱面状的复用多张图像形成单一图像,然后打印到一个柱面透镜阵列的平面侧,这样从某一特定角度只能看到组合图像的一部分。为了减少光栅印刷中因相邻像素间缺乏关联和打印机失真而造成的误差,光栅印刷加网作为新一代的加网算法对数字加网提出挑战。在本论文中,讨论了打印机的失真问题,通过更好地控制打印机,达到光栅印刷中减少加网错误的目的。同时,考虑到打印像素对周围像素所产生的灰阶影响,通过各种方法调整打印机分辨率以解决网点重叠,从而减少打印图像模糊。     

基于正六边形网点的平移旋转加网机制研究

针对柔性版印刷加网角度的特殊性,结合正六边形网点的优点,提出了基于正六边形网点的平移旋转加网机制,并设计了加网阈值矩阵以及平移旋转机制,然后采用Matlab编程方法实现对标准灰度图的加网,从而验证了该加网机制的可行性。最后通过理论分析与实验计算,证明该加网机制中的旋转机制比较成功,而平移机制容易产生龟纹。     

调幅加网阈值矩阵设计方法与加网原理

本文针对报纸印刷和精细商业印刷中常用的加网线数,基于最小阈值矩阵原理,详述12×12网格的最小阈值矩阵的设计原则。并提出一种网线角度差小于1°的阈值矩阵设计方法,较好地解决了有理正切加网网线角度如何接近15°这一核心技术问题。同时,阐述了用此阈值矩阵实现灰度图像有理正切调幅加网的具体过程。     

Design principles of hybrid approaches in new product development: a systematic literature review

Setting the right approach for new product development (NPD) in the presence of uncertainty remains an ongoing debate in innovation management. Stage-gate systems (SGS) and agile methodology (AM) are the dominant approaches. Recently, hybrid approaches (combining SGS and AM) have been proposed. Although these hybrid approaches represent a significant development in NPD, combining them without considering their design principles might lead to contradictory and competing conceptual formulations, thus increasing the difficulty of comparison among studies. Moreover, scholars and practitioners may struggle to understand when, why and how a certain configuration of the NPD process provides the right response to different manifestations of uncertainty. The current literature faces problems regarding the clarity of design principles (e.g. flexibility and adaptability), and this has led to research gaps concerning the uncertainty contingency and outcomes of hybrid approaches. This study combines bibliometric and content analyses to identify four design parameters and principles of NPD hybrid approaches: flexibility, adaptability, velocity and integration. Our findings might help advance the development and comparison of different hybrid approaches.     

煤矿提高块煤率的实践与探索

本文分析介绍了文玉煤矿从原煤运输、煤炭储存、回采工艺、二次筛分等生产过程全方位提高块煤率的途径,并通过实践取得很好效果,显著提高煤矿经济效益。     

SCREENING AND MERGER ACTIVITY*

In our paper, the target of a proposed merger, by setting a reserve price, is able to screen prospective acquirers according to their (expected) ability to generate merger‐specific synergies. Both empirical evidence and many merger models suggest that the difference between high and low‐synergy mergers becomes smaller during booms. Thus, a target's opportunity cost for sorting out relatively less fitting acquirers increases and, hence, targets screen less tightly during booms, which leads to a hike in merger activity. Our screening mechanism not only predicts that merger activity is intense during booms and subdued during recessions but is also consistent with other stylized facts about takeovers and generates novel testable predictions.     

Pricing of mobile phone attributes at the retail level in a developing country: Hedonic analysis

This study has been undertaken to determine the effect of mobile phone attributes on their retail market prices. A log-linear hedonic price model was fitted to a total of 348 handsets, for which data were collected about various attributes from different websites, while the price data were obtained from mobile phone retailers in two major cities of Pakistan from November 2016 to February 2017. Results indicate that brand, battery capacity, weight, operating system, RAM, memory size and display size have a significant positive effect on mobile phone prices. Given the significant premium associated with various characteristics, manufacturers need to formulate strategies to emphasize the battery capacity of 2000-3000?mAH, RAM of more than 1GB, screen size of more than 5 inches, memory size of more than 8GB, back camera of over 15MP, 4G network mode, front camera and FM radio.     

Benefits of using hybrid business models within a supply chain

Today's competition between supply chains (SC) requires optimized strategies in order to satisfy customers’ demands. The business models used by the SC members play a big role in this delivery of value to the customer. From here the notion that a mismatch between the intended market and the business model used to address it translates into a poor SC performance. As real-life business environments have become really complex, SC members have been forced to use hybrid business models (that is, the integration of features of two different business models). A review of the literature in the area of supply chain management shows that past research have not paid much attention to this issue. The objective of this paper is to quantitatively evaluate the influence these hybrid business models have on the SC performance. For this purpose, a system dynamics (SD) simulation model is developed and tested under different operational conditions, so conclusions can be derived regarding the benefits of the use of hybrid business models.     

有线电视光缆传输系统指标的分析与设计

介绍了有线电视网中ＡＭ 光缆干线传输综合指标的分析与设计。由于ＤＦＢ激光器间的非线性有较大差异,故引入了光链路这一参数。当把这一参数引入有线电视光缆干线设计时,可根据有线电视光缆系统不同传输距离、光接点的分配指标和光缆干线传输系统的实际情况,计算光链路损耗,以确定光端设备的选型,从而进一步确定光缆干线传输系统的设计,使得有线电视总系统指标给以保证     

Modeling New Product Screening Decisions

A variety of systematic procedures have been proposed to manage the task of evaluating potential new products at various stages of the development process. Kenneth Baker and Gerald Albaum have chosen to contrast the performance of several different types of screening models using the actual evaluations of 86 new product managers employed by 76 Fortune 500 companies. Managers were briefed on six lighting products actually developed by another manufacturer, and they evaluated all six products using 33 criteria. The screening models were used to predict the success or failure of each of the product concepts, and these predictions were compared to the actual results experienced by the original manufacturer. Thus, the study provides insights on the accuracy of screening models.     

Exploring Users' Appropriateness as a Proxy for Experts When Screening New Product/Service Ideas

Despite the popularity and extensive use of engaging users in crowdvoting, very little research has been conducted into the appropriateness of users as substitutes for experts when judging ideas. Accordingly, the purpose of this paper is to investigate the appropriateness of using users as a proxy for professional experts during the initial idea screening of new product/service ideas. In other words, are users' assessments during idea screening conformant with professional experts' assessments and are they reliable as a proxy for experts during idea screening? In a comparative study, two different approaches to outsourcing the screening of wireless ideas to users are examined, including assessment by two different user panels: (1) technically skilled users and (2) technically naïve users. These two approaches were compared with the assessments made by professional experts. The results showed no conformance between users and experts when comparing their absolute scores. However, during a relative comparison (the ranking of ideas), both user panels were conformant with the professional experts. A test of the user panels' ability to select the same top ideas as the professional experts was successful, indicating good conformance between the user panels and the professional experts. This paper's contribution is knowledge of how conformant external users are compared with professional expert judges during idea screening. The results indicate that companies can employ users during the initial screening process using criteria assessment to select the best ideas for further elaboration, something that would significantly reduce the number of ideas. The paper suggests an alternative design to crowdvoting, whereby the users assess the relevant criteria.