Personal computer

About: Personal computer is a research topic. Over the lifetime, 58809 publications have been published within this topic receiving 800814 citations. The topic is also known as: PC.

Product Proliferation: An Empirical Analysis of Product Line Determinants and Market Outcomes

Abstract: Considering the number of new product introductions and available product varieties today, the practice of product proliferation is visibly evident in many diverse industries. Given its prevalence in practice, understanding the determinants and implications of firm proliferation strategies clearly has important managerial relevance. Previous theoretical research has identified three primary effects of a proliferation strategy: (1) a broad product line can increase the overall demand faced by the firm, (2) a broad product line can affect supply by increasing costs, and (3) broad product lines can have strategic consequences (e.g., long product lines can deter entry, thereby allowing an incumbent firm to raise prices). However, despite the theoretical interest in this common business practice, there has been very little empirical research on this topic. Moreover, no empirical study has simultaneously considered all three of the possible effects associated with a proliferation strategy. Consequently, in this paper we propose a three-equation simultaneous system that captures both the determinants and market outcomes of a firm's product line decisions. In particular, we specify market share, price, and product line length equations, which are estimated by three stage least squares. Using this structure, we empirically study the personal computer industry over the period 1981-1992. Our empirical results demonstrate that proliferation strategies do not have a unidimensional explanation. We find that product proliferation decisions have both demand (market share) and supply (price) implications. Our empirical results also suggest that the firm-level net market share impact of product proliferation in the personal computer industry is negative (i.e., the cost increases associated with a broader product line dominate any potential demand increases). Asexpected, we find that structural competitive factors play an important role in the determinants and market outcomes ofa firm's product line decisions. However, we do not find evidence of firms using proliferation strategies to deter entry in this industry. Finally, we also demonstrate that some of the empirical conclusions from previous research are reversed once product line length is specified as endogenous in the share and price specifications.

Playback apparatus, playback method, and recording medium

Abstract: Audio data are played back by a personal computer a relationship with a playback process recognized easily. Displays showing the contents of play lists are arranged and displayed so that the contents become continuous in sequence in a playback sequence from content that is currently being played back from a display of an operation element that causes an image of a playback process to appear or from a display showing the content which is currently being played back. When the playback of one piece of content of one play list from among a plurality of play lists is terminated and one piece of content of an other play list is played back, at least the content that is currently being played back and content to be subsequently played back are displayed so that the contents can be distinguished.

Apparatus and method for a personal onboard information system

Abstract: A personal onboard information system for use in a vehicle. The system includes a portable, personal computer including a touch-responsive screen and a cradle mounted on the vehicle for detachably receiving the computer. The computer is programmed to generate characters of preset size on a display on the screen. The cradle has a lamp for illuminating the computer screen and a power supply for supplying the computer with power when the computer is in the cradle. The system further includes an interface communicating with the computer for formatting the display for use of the computer in the vehicle when the computer is in the cradle. The interface is resident in the computer or in the cradle and causes the display to display characters relatively larger than the characters of preset size so that the characters can be easily viewed by a passenger thereby facilitating use of the computer in the vehicle.

User interface and rule processing for a personal communications routing system

Abstract: A user interface provides a uniform control scheme among different devices in a personal communications routing system. The system allows devices such as a personal computer, personal information communicator, pager, fax machine and base station to be operated with a standard twelve key telephone keypad controller for the purpose of accessing electronic messages such as e-mail, voice-mail, fax transmissions, etc. Handheld communicators are docked with the devices to provide wireless transmission between a base station and numerous devices in a multi-user environment. The base station receives electronic messages for the users in, e.g., an office and routes the messages to a device as the user instructs. The user is able to perform operations on the messages such as reading, responding, deleting, etc., by using the keypad. A visual indication of user designated message bins, along with icons to represent messages received, is used to special advantage by coordinating the bin layout with the arrangement of keys on the keypad. Another feature of the system is that rules can be predefined to route, screen or otherwise manipulate the messages. The rules are applied by the base station to each incoming message. Different users can have different rules such as automatic forwarding of messages, automatic paging upon receipt of a message and sorting of messages by sender's name or time of day.

Apparatus and method for delivery of advertisement information to mobile units

Abstract: In the present invention, advertisements are transmitted electronically at designated locations, as a substitute for stationary billboards. A network navigation center outputs guide access information GAI to a personal computer of an ad sponsor over the Internet and receives registration of advertisement information ADI for the designated location(s) from the personal computer of the ad sponsor according to the guide access information GAI. In addition, the network navigation center receives current position information API from mobile communication device(s) carried by automobile, via a mobile telephone base station and a public telephone network. Likewise, the network navigation center transmits the advertisement information ADI, based on current position information API, to the mobile communication instrument via the public telephone network and mobile telephone base station.