585 research outputs found
The roles of products in product emotions an explorative study
Although several theoretical frameworks that aim to explain the emotional impact of product design have been introduced in design research literature, none of these frameworks clearly specifies the role of the product in these emotions. This paper reports a study that was designed to explore the variety of roles that products can play in emotional experiences. In a three staged experience sampling study, 29 participants produced 170 records of emotions experienced while interacting with products. Each case was examined in order to identify the antecedent event (the event triggering the emotion) and the mental object (what the emotion is about). The results indicated that several types of events involved in the user-product interaction can elicit an emotional experience: noticing a product; an event occurring during product usage; an entire usage episode; an external agent mentioning the product; and a change in the relationship between a user and a product . It was also found that the resulting emotional responses can be about (can be attributed to) several types of mental objects: a physical object, such as the particular product involved; the user or some other person; the actions of the user or the designer; the antecedent event itself. The results are used to identify and discuss eight distinct roles that products can play in the experience of emotions. In addition, examples are provided to illustrate how these roles can facilitate a structured approach to design for emotion.
Keywords:
Design and emotion, user-product interaction</p
Comparison of Metaheuristic Optimization Algorithms for Quadrotor PID Controllers
In the present study, different solution methods are discussed in order to control the quadrotor with the most optimal PID parameters for the determined purposes. One of these methods is to make use of meta-heuristic algorithms in control systems. There are some limitations of using a PID controller as a classical construct. However, it is thought that more successful results will be obtained by optimizing its parameters through meta-heuristic algorithms. Initially, the mathematical model of the vehicle was created in MATLAB/Simulink. Then, genetic algorithms (GA), artificial bee colony (ABC), particle swarm optimization (PSO) and firefly algorithms (FA) were determined respectively as optimization methods. And these optimization methods used to determine the PID control parameters are applied to the developed mathematical model in the MATLAB/Simulink environment. In addition, the performances of the optimization methods are evaluated according to the comparison criteria. As a result of the comparison carried out according to ITAE (Integral Time Absolute Error) fitness criteria, ABC (1.2% - 4.4%) in terms of altitude, FA (4% - 13%) in terms of roll angle, GA (13% - %21) in terms of pitch angle, and PSO (4% - %15) in terms of yaw angle has been more successful than other methods
Product related determinants of user satisfaction for different product groups
This paper focuses on the product related determinants of user satisfaction. It presents the results of an empirical study conducted to reveal the impacts of product related determinants on different product groups. The significance of different determinants influencing overall satisfaction response was investigated for different product groups via semi-structured interviews followed by quantitative analysis. For each product group, the findings were summarized and sub-headings of factors were listed. The findings of the study suggest that the determinants of user satisfaction differs for different product groups
Color science of nanocrystal quantum dots for lighting and displays
Cataloged from PDF version of article.Colloidal nanocrystals of semiconductor quantum dots (QDs) are gaining prominence among the optoelectronic materials in the photonics industry. Among their many applications, their use in artificial lighting and displays has attracted special attention thanks to their high efficiency and narrow emission band, enabling spectral purity and fine tunability. By employing QDs in color-conversion LEDs, it is possible to simultaneously accomplish successful color rendition of the illuminated objects together with a good spectral overlap between the emission spectrum of the device and the sensitivity of the human eye, in addition to a warm white color, in contrast to other conventional sources such as incandescent and fluorescent lamps, and phosphor-based LEDs, which cannot achieve all of these properties at the same time. In this review, we summarize the color science of QDs for lighting and displays, and present the recent developments in QD-integrated LEDs and display research. First, we start with a general introduction to color science, photometry, and radiometry. After presenting an overview of QDs, we continue with the spectral designs of QD-integrated white LEDs that have led to efficient lighting for indoor and outdoor applications. Subsequently, we discuss QD color-conversion LEDs and displays as proof-of-concept applications - a new paradigm in artificial lighting and displays. Finally, we conclude with a summary of research opportunities and challenges along with a future outlook
Filter design for small target detection on infrared imagery using normalized-cross-correlation layer
In this paper, we introduce a machine learning approach to the problem of
infrared small target detection filter design. For this purpose, similarly to a
convolutional layer of a neural network, the normalized-cross-correlational
(NCC) layer, which we utilize for designing a target detection/recognition
filter bank, is proposed. By employing the NCC layer in a neural network
structure, we introduce a framework, in which supervised training is used to
calculate the optimal filter shape and the optimum number of filters required
for a specific target detection/recognition task on infrared images. We also
propose the mean-absolute-deviation NCC (MAD-NCC) layer, an efficient
implementation of the proposed NCC layer, designed especially for FPGA systems,
in which square root operations are avoided for real-time computation. As a
case study we work on dim-target detection on mid-wave infrared imagery and
obtain the filters that can discriminate a dim target from various types of
background clutter, specific to our operational concept
Okul Müdürlerinin Paternalist Liderlik Davranışları ile Öğretmenlerin Örgütsel Bağlılıkları Arasındaki İlişki
Bu araştırmanın amacı; okul müdürlerinin paternalist liderlik davranışları
ile öğretmenlerin örgütsel bağlılıkları arasındaki ilişkiyi incelemektir. Araştırmanın
evreni olarak İstanbul ili Sultanbeyli ilçesindeki beş resmi okulda çalışan yaklaşık
220 personel seçilmiştir. Bu okullarda çalışan herhangi birimlerden seçilen 150
personel çalışmanın örneklemini oluşturmuştur. Araştırma verileri yüz yüze anket
yapılarak toplanmış ancak 11 ankette eksik veya yanlış bilgi olması sebebiyle
çalışmaya 139 anket dâhil edilmiştir. Çalışmaya katılan katılımcıların %55,4’ü erkek,
%44,6’sı kadındır. Elde edilen verilerin analizlerini yapmak için regresyon ve
korelasyon testleri uygulanmıştır. Yapılan analizler neticesinde okul müdürlerinin
paternalist liderlik davranışları ile öğretmenlerin örgütsel bağlılıkları arasında pozitif
ve anlamlı bir ilişki olduğu görülmektedir. Ayrıca paternalist liderliğin alt
boyutlarından ahlaki liderliğin pozitif ve anlamlı etkisinin olduğu ancak diğer alt
boyutlar olan yardımsever liderlik, otoriter liderlik ve çıkarcı liderliğin örgütsel
bağlılığa etkisi olmadığı gözlemlenmiştir. Ayrıca örgütsel bağlılığın %18 oranla
paternalist liderliğin alt boyutları ile açıklanabileceği bulgusuna varılmıştır
High scotopic/photopic ratio white-light-emitting diodes integrated with semiconductor nanophosphors of colloidal quantum dots
Cataloged from PDF version of article.We propose and demonstrate single-chip white-light-emitting diodes (WLEDs) integrated with semiconductor nanophosphors of colloidal quantum dots for high scotopic/photopic (S/P) ratio. These color conversion WLEDs achieve S/P ratios over 3.00, which exceeds the current limit of 2.50 in common lighting technologies, while sustaining sufficient levels of color rendering index. (C) 2011 Optical Society of Americ
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