Mathematical Problems in Engineering

Mathematical Problems in Engineering / 2013 / Article
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Selected Papers from the International Conference on Information, Communication, and Engineering 2013

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Research Article | Open Access

Volume 2013 |Article ID 629708 | 10 pages | https://doi.org/10.1155/2013/629708

An Innovative Design Methodology KKBDCA for Affective Product Development

Academic Editor: Teen-Hang Meen
Received15 Sep 2013
Accepted13 Oct 2013
Published02 Dec 2013

Abstract

This study proposes an innovative design scheme, called KKBDCA (Kano model, Kansei engineering, Base information, Design developing, Creativity thinking, and quality Assurance) for developing affective products. Firstly, a modified Kano model is proposed to link the customer’s overall satisfaction and customer’s partial preferences. Secondly, the KE together with appropriate quantification theory is used to establish the mapping relationship between design elements and customers’ preferences. Then, a prototype of product with high customer satisfaction index (CSI) is selected from the product database as design reference. Thirdly, through the operation of BDCA design procedure, a new style of product is performed. Finally, verification is done to the new designed product and a satisfying evaluation result is obtained. The proposed integrated scheme may be used as a design methodology to explore new product style that satisfies customers’ needs in overall aspects.

1. Introduction

The factors that influence the willing of consumers to purchase a certain product are multiphases, such as psychological, economic, and social. These factors usually change with time and different customers have their own motivation to make purchase decision. Among these factors, there is one deterministic factor that never changes: the customers’ preferences.

Customer’s preference or sensation is hard to be expressed and even hard to quantify, and there were lots of ways proposed to express human’s preference about a product, such as words, physiological response (e.g., heart rate, EMG, and EEG), people’s behaviors and actions, and facial and body expressions [1, 2]. Among these different ways of measuring human’s affection or Kansei (Japanese word), the most common way is through words. This method has been successfully applied in many product design studies [38]. However, only one single word or even multiple words are not sufficient to describe customer’s preference. Moreover, improper consideration of the Kansei words may lead to vital results when designing products matching customers’ requirements.

In general, the purchase decision of a customer is directly controlled by his overall satisfaction about the product, not his partial preference. And, how much influence of the individual sensation on the overall satisfaction is still not clear.

To link the customer’s overall satisfaction with individual sensation, a modified Kano’s model is proposed by this study. Originally speaking, the Kano model [9] is a 2D diagram in order to display three groups of qualitative wants and needs of customers. These three groups include basic needs, performance needs, and motivational needs as shown in Figure 1. The basic needs curve (must-be requirement) of Kano model shows that if customers expect more satisfaction with receiving products and services, it cannot satisfy customers. The excitement needs curve (one-dimensional requirement) shows that whenever the product has a higher performance, customers receive more satisfaction. The performance needs curve (attractive requirement) indicates the fact that non-fulfillment of performance requirements in the product will cause dissatisfaction, but complete and suitable fulfillment of them will be followed by customers’ satisfaction.

The next problem is how to convert the customers’ preferences into product design elements and eventually design an innovative product satisfying customers. To concretely translate the customer preference into product design elements, many methodologies were proposed in the past, such as quality function development (QFD) and matrix approach [10, 11]. Specifically, a popular methodology to translate consumers’ psychological feelings about a product into perceptual design elements is the “Kansei Engineering” (KE) [1, 2]. It uses the “adjective words (Kansei words)” to describe the human preference and builds proper model to map these words into product design elements. Based on this mapping model, designers may easily evaluate product design style and design suitable product style meeting the given Kansei words. The Kansei engineering has been successfully applied in the field of product design [9, 1214] to explore the relationship between the feeling of the consumers and the design elements of the product. Examining these studies, it is found that they did not extend the Kansei engineering scheme to really design a product and evaluate the design results from the viewpoint of customer satisfaction. In other words, the application of Kansei engineering scheme was so far limited and only used for evaluating the customer preference to existed products. Regarding this, this study attempts to develop an innovative design procedure, named BDCA, to compensate the insufficiency of KE.

In summary, our study will not only include the traditional Kansei engineering procedure to build a suitable model to connect the design features with customer preference (Kansei words) but also extend both upstream to include customer satisfaction (using the modified Kano model) and downstream to include the innovation procedure of product design. Furthermore, an overall customer satisfaction index is proposed to objectively evaluate the new design results from the viewpoint of customer preference. The manipulation procedures (Step 1 to Step 8) are shown in Figure 2 and explained as follows. (1) Firstly, we propose a modified Kano model to link the customer Kansei with customer satisfaction (Step 1 to Step 4). (2) Secondly, the Kansei engineering scheme together with the QT I is used to map the design elements into customer Kansei (Steps 5 and 6). (3) Thirdly, using the high-weighting design elements as basis, an illustrative new style of digital camera is thus designed. (4) Then, the BDCA design procedure is introduced to design a new product (Step 7). (5) Eventually, a customer satisfaction index (CSI) is proposed to give a final evaluation on judging the goodness of the new designed product (Step 8).

2. Methodology

2.1. The Modified Kano Model

In order to link the customers’ partial preferences with their overall satisfaction about a product, the aforementioned Kano’s model is modified as follows. First, the above three categories of customer needs remain unchanged. Second, the horizontal axis is modified from “manner of product and service” into “customer’s Kansei about products (adjective words).” This modification establishes a bridge between customer’s individual Kansei and customer’s overall satisfaction. Through this modified Kano model, designers may easily understand what category the customer preference belongs to and how much influence it has on the customer satisfaction.

2.2. The Kansei Engineering

According to Nagamachi [2], there are six types of KE technique categorized as follows: (1) Type I: category classification, (2) Type II: Kansei engineering system, (3) Type III: Kansei engineering modeling, (4) Type IV: hybrid Kansei engineering, (5) Type V: virtual Kansei engineering, and (6) Type VI: collaborative Kansei engineering. In this study, we are focusing on Type III. The major work of the KE modeling (TYPE III) is to establish a proper model that connects people’s psychological feelings with perceptual design elements of a product. Meanwhile, to complete the KE modeling work, the popular Quantitative Theory Type I [15] is used to build the relationship of product design elements and Kansei words. The entire manipulation procedure, including five steps, is described as follows.

Step 1. Initially, products within a specifically domain are described from two perspectives: a semantic perspective (image space) and a physical perspective (design space). These two descriptions span one space each, which in some cases can be defined mathematically as a vector space [16].

Step 2. Data in these two spaces are analyzed and reduced using statistical methods [17] such as K-Means method (KM), Kawakita Jirol method (KJ), multi-dimensional scaling method (MDS), hierarchical cluster analysis (HCA), and factor analysis (FA).

Step 3. Subsequently, the interactions between these two spaces are analyzed to realize their behavior. A final Kansei evaluation of questionnaire survey (product feature elements versus product images) is accomplished by proper subjects.

Step 4. Then the QT1 is applied to establish the relationship between product feature elements and product images. The weightings of every design attribute on different Kansei words are examined as the modification basis for designing future product.

Step 5. To evaluate the performance of our proposed integrated schemes, a validity test for the modeling is conducted.

2.3. The Quantification Mapping Model

The Quantitative Theory Type I is a multiple regression analysis scheme for deducing the relationship between a quantitative variable and qualitative variables. Here the quantitative variable, also the dependent variable, is set as the Kansei word, and the qualitative variables, also the independent variables, are set as design parameters. The mapping results are expressed in terms of the partial correlation coefficients (PCCs). The value of PCC indicates the relative importance of each design parameter to each Kansei word. Furthermore, the correlation between the observed value and predicted value of the dependent variables, expressed as , is calculated. The coefficient of multiple determinations is . This parameter explains the linearity extent between the dependent variables and independent variable.

2.4. The BDCA Design Procedure

This study proposes a design procedure, called KKBDCA, to design a product based on the results obtained from the Kano model and the Kansei engineering. The remained BDCA means base information, design developing, creativity thinking, quality assurance, as shown in Figure 3. This procedure includes four steps. Firstly, we select the highest CSI value sample as the design reference. Then, we examine the variation influence of all design elements on each Kansei word and think about their relationship. Secondly, we extract the commonly high influential elements of each of design categories for all three quality-sufficiency Kansei words, according to the results from the modified Kano model and Kansei engineering manipulation. Thirdly, we execute the creativity thinking work and perform the conceptual design. Fourthly, we introduce the questionnaire survey to the obtained prototype and calculate its CSI value. Then, we modify the prototype to obtain a new model of product which may catch current customers’ overall satisfaction.

3. Results and Discussion

Here we choose the digital camera as the experimental target, but the proposed methodologies can be applied to other similar products with various design elements. The experimental study involves 30 subjects. Each has more than 3 years of experience in using digital camera. The following is the manipulation processes of the customer-satisfaction-based KE technique applying to the innovative design of a digital camera.

3.1. Product Information
3.1.1. Sample Collection

To identify the design elements of digital cameras, we first selected 159 digital cameras of various makers and models, which entered the market during 2006–2011. Totally 60 styles of digital cameras, excluding those using for specific purposes or styles with too exaggerated out-looking, were chosen to represent the space of product. These samples were represented in pictures that had been done as similar as possible in contrasts, sizes, and soon to be comparable in the experiment. The pictures were also of good quality and shading to represent the three dimensional shapes of the products. We then asked the subjects to classify these 60 digital camera samples into 2~10 groups based on their similarity degree, using Kawakida Jirou method. This method was introduced by Kawakida Jirou in 1953 [18] for classifying ideas, concepts, or objects into several groups by their similarity degree. All participants were skilled in visualization and capable of considering three-dimensional shapes from pictures. Then, we built a similarity matrix from the previously obtained separation result. The similarity matrix was transformed into a dissimilarity matrix and analyzed by the multidimensional scaling (MDS) scheme. To determine the most appropriate dimensionality for the data, we examined 9 different dimensional spaces (ranging from 2 to 10 dimensions). A result of 6-dimensions with stress of 0.04912 was suggested here, since a commonly used measure of fit in MDS is “stress”, which is the square root of a normalized residual sum of squares. A smaller stress value indicates a better fit (an empirical suggested stress value is 0.05 [17]). Thus, the 6 dimensional spaces were appropriate. Finally, the hierarchical cluster analysis (HCA) was performed based on the MDS result.

Furthermore, the representative of each group was obtained via the K-means clustering scheme. This scheme calculates the distance of individual sample to its group center of gravity and eventually the sample which has the smallest distance can be visualized as the group representative. For instance, the samples and their representative of group 2, including the calculated distances to their group center of gravity, are obtained and shown in Table 1.


Sample no.GroupDistance

p.2820.787
p.5220.719
p.9520.887
p.10820.922
p.10920.825
p.11220.737
p.12821.001
p.14620.745
p.150  (representative)20.710
p.15320.782

629708.tab.001

p.: product.
Bold font means the data of representative of Group 2.
3.1.2. Product Feature

Distinguished from the usual way that only considered the form style as the design parameter, this study, more meaningfully, extends the design elements to include three design categories: hardware appearance design, form style, and color type. Regarding this, a detailed design analysis, including the morphological analysis, is performed to extract the design features from the 6 representatives and their group samples. The result is listed in Table 2 which shows the obtained 3 categories of design features and 11 associated design elements (denoted as X1~X11). Each design element has its own different variation, numbering from 1 to 4.


Design attributeDesign
element
Type IType IIType IIIType IV

Power (X1) keyPushing-on type (X11)Turning-on type (X12)Sliding-on type (X13)
Hardware designPicturing switch button (X2)629708.tab.002629708.tab.003Combined with the function key (X23)
Function
Key type (X3)
629708.tab.004629708.tab.005629708.tab.006629708.tab.007
Screen size (X4)3.5′′ (X41)3′′ (X42)2.7′′ (X43)2.5′′ (X44)
Len type (X5)629708.tab.008629708.tab.009

Form styleUpper face (X6)629708.tab.0010629708.tab.0011629708.tab.0012629708.tab.0013
Front face (X7)629708.tab.0014629708.tab.0015629708.tab.0016629708.tab.0017
Side face (X8)629708.tab.0018629708.tab.0019

Color typeFront face: brightness (X9)No
(X91)
Low
(X92)
Medium
(X93)
High
(X94)
Front face:
hue (X10)
No
(X101)
Low
(X102)
Medium
(X103)
High
(X104)
Rear face:
color (X11)
Same with front face
(X111)
Black
(X112)
Silver
(X113)

3.2. Product Image

This study uses the Kansei words (image words) to describe the consumer’s psychological feeling and perception about the image of a product. The following is the details to extract the representatives of image words.

3.2.1. Image Collection

A total of 60 Kansei adjective words describing the integral feeling of collected digital cameras were chosen from magazines, literature, manuals, experts, experienced users and product catalogs. And after deleting those too exaggerated, similar, or overlapping words, eventually a total of 24 low-level Kansei words was built up.

3.2.2. High-Level Kansei Words

To extract the representative image words for describing the consumers’ perception about the collected digital cameras, a designed questionnaire interview was done to the subjects. A result of three final high-voted high-level Kansei words of product images was obtained as follows: usability ( ), aesthetics ( ), and innovation ( ).

3.3. Quality Sufficiency of Image

Based on the proposed modified Kano model, (1) the vertical axis is set as the overall customer satisfaction about a product and denoted as CSI and (2) the horizontal axis is set as the quality-sufficiency high-level Kansei words, denoted as ~ , which represent the proper feelings (preferences) of consumers about the selected products. To determine the contribution extent as well as classification of each quality-sufficiency Kansei word to the overall customer satisfaction, a questionnaire survey was done to 30 subjects. The major question is how much influence will happen (range: −5~5) if the extent of Kansei word is increased by one unit. The obtained mean influence weighting of , , and on customer satisfaction is , , and and it can be classified as attractive, one-dimensional, and one-dimensional quality, respectively (shown in Table 3).


Quality-sufficiency
image
(usability) (aesthetics) (innovation)

Influence on CSI (weighting)

Kano
category
Attractive qualityOne-dimensional
quality
One-dimensional quality

3.4. Mathematic Mapping Model
3.4.1. Sample Evaluation

The Kansei evaluation questionnaire is done to 30 subjects for evaluating their preference about the collected 60 samples using the 7-scale semantic differential scheme. The obtained average score of ~ is listed in Table 4. Further, the CSI value of each sample is calculated from the formula , and it is found that the N15 sample has the highest rank of customer satisfaction. This sample may be used as the basis of conceptual design so as to further design an innovative product.


Samples CSIRank

N014.354.173.7912.01135
N024.443.523.4612.41625
N033.683.523.4610.45258
N045.214.814.9614.7874
N054.904.314.4313.53515
N064.354.684.2312.76120
N074.334.553.8712.25731
N084.604.354.8013.59313
N094.914.344.5713.72411
N104.304.424.0612.37727
N113.383.342.999.43260
N123.584.153.5110.67655
N135.074.504.3413.74010
N144.984.684.8214.2658
N154.984.945.6515.3501
N163.664.193.4410.71854
N174.393.583.3711.29945
N183.743.803.7911.04450
N195.604.944.0214.2657
N203.813.893.4310.76052
N214.514.443.3611.84738
N225.144.834.8714.6016
N235.255.354.7814.8843
N243.963.693.3210.73453
N255.074.334.2713.57914
N263.754.113.9011.33143
N273.944.153.6211.27246
N284.414.464.1112.59722
N294.203.462.9210.47357
N304.323.793.4611.41142
N314.913.893.4412.20233
N324.223.532.9310.54456
N334.674.043.7812.35529
N345.634.744.3814.6285
N354.633.883.7812.22732
N364.434.734.7513.49216
N374.433.703.3911.43041
N383.614.234.0011.32144
N393.574.114.0511.27147
N403.594.284.4111.79440
N413.813.273.2610.27259
N424.464.434.4313.01918
N434.194.344.9513.22917
N444.354.684.2312.76121
N454.454.663.8512.44124
N464.444.524.4113.02119
N473.994.344.4612.40026
N484.314.244.0212.25930
N494.394.113.6111.82639
N505.074.544.2213.62012
N513.744.213.7511.19148
N525.134.704.2513.8089
N533.894.013.6411.16449
N545.294.155.2314.8942
N554.334.353.6611.91936
N564.554.123.9812.46823
N573.634.243.6110.89951
N584.174.173.8811.88237
N594.554.183.8612.35728
N604.283.914.0212.06534

3.4.2. Model Building

Based on the results of sample feature decomposition, together with the obtained Kansei credits of every sample listed in Table 4, the linear relationship between design elements and Kansei words can be built via QT1. The obtained results of the partial correlation coefficients (PCCs), which mean the relative importance of every design element on the Kansei image, are listed in Table 5.(i) For (usability).It is seen that there is no influence on for design parameters X12, X23, X31, X42, X51, X62, X71, X93, X104, and X111, since their PCCs are all zero. Further, X32, X33, X34, X81, and X82 have relatively high positive influences on (the higher the better), since their coefficients are all greater than 0.3. On the other hand, X13, X21, and X52 have significantly reverse influences on (the lower the better), since their coefficients are all smaller than −0.3.(ii) For (aesthetics).Design parameters X12, X23, X31, X42, X51, X62, X72, X93, X104, and X111 have no influence (zero PCC) on . High positive weighting (greater than 0.3) are found in design parameters: X33, X34, X81, X82, X102, X112, and X113. It is noted that the design parameters X33, X34, X81, and X82 have commonly positive influences on both and . High reverse weighting (smaller than −0.3) is found in design parameters: X13, X21, X22, X44, X63, and X74.(iii) For (innovation).Design parameters X12, X23, X31, X42, X51, X62, X71, X93, X104, and X111 have no influence (zero PCC) on . High positive weighting (greater than 0.3) is found in design parameters X11, X13, X32, X33, X34, X102, and X112. It is noted that the design parameters X33 and X34 have commonly and significantly positive influences on all three Kansei words. High reverse weighting (smaller than −0.3) is found in design parameters X21, X22, X61, X63, X73, X74, X81, and X82. It is noted that the design parameters X21, X22, X63, and X74 have commonly and significantly reverse influences on both and .


Design elements

X1
 X11−0.1400.1660.471
 X120.0000.0000.000
 X13−0.318−0.4980.767
X2
 X21−0.710−0.417−0.395
 X220.244−0.897−0.395
 X230.0000.0000.000
X3
 X310.0000.0000.000
 X320.3460.2490.323
 X331.0921.2350.940
 X341.0711.6220.380
X4
 X41−0.028−0.215−0.041
 X420.0000.0000.000
 X430.144−0.198−0.112
 X44−0.027−0.565−0.137
X5
 X510.0000.0000.000
 X52−0.353−0.1300.158
X6
 X610.020−0.096−0.325
 X620.0000.0000.000
 X630.004−0.886−0.927
 X64−0.223−0.2810.213
X7
 X710.0000.0000.000
 X720.109−0.1450.061
 X73−0.0110.050−0.552
 X74−0.147−0.554−0.345
X8
 X810.6200.342−0.302
 X820.5800.483−0.582
X9
 X910.2620.1150.286
 X92−0.049−0.254−0.174
 X930.0000.0000.000
 X94−0.087−0.009−0.231
X10
 X101−0.030−0.288−0.118
 X1020.1380.3310.332
 X103−0.0240.2690.084
 X1040.0000.0000.000
X11
 X1110.0000.0000.000
 X112−0.0840.3080.445
 X113−0.2950.4900.299
(constant)3.8143.8843.972
0.8890.5920.688

3.4.3. Verification

To identify the modeling accuracy, other four samples (different from the 60 training samples), numbering T01, T02, T03, and T04, are randomly chosen from the sample population. These samples are decomposed first, and through questionnaire survey, the Kanei credits are obtained. Then the CSI value of each sample is calculated using the previously obtained Kano weighting for each quality-sufficiency Kansei word. The results including the final customer satisfaction ranking are listed in Table 6. It is found that although the predicted and experimental sample CSI values are slightly different, the ranking orders are the same. This result is obviously satisfying.


Sample T01Sample T02Sample T03Sample T04

Prediction
CSI12.25913.55813.45010.812
Ranking3124

Experiment
CSI11.97713.62813.18611.023
Ranking3124

3.5. New Product Creation

Basically, the Kansei engineering is used to deal with customers’ preference about products in the past. Also, the obtained design features of the target product are past events. Certainly, the current or future design of a product should be different from the past one. However, the KE modeling results do provide valuable design trace and may give us a guide for designing a future product. The following is the manipulation of the proposed BDCA design process to design an innovative future product based on the past-obtained KE results.

3.5.1. The BDCA Procedure

Step 1 (B—base information providing). Examining  the PCCs of all design elements to three quality-sufficiency Kansei words, it is found that the most influential design factors for each design category are (1) X11 for category X1, (2) X22 for category X2, (3) X33 and X34 for category X3, (4) X44 for category X4, (5) X52 for category X5, (6) X63 for category X6, (7) X73 for category X7, (8) X82 for category X8, (9) X91 for category X9, (10) X101 for category X10, and (11) X112 for category X11. These important design parameters give us a guide to design a good product satisfying customer needs. The enhancement of these design parameters may lead to an increase of CSI.
Further, it is crucial to offer an useful design reference in order to construct a new product prototype. Regarding this, this study proposes that the product having the highest CSI credit may be selected as a design reference, for example, the sample N15 (shown in Table 7). So far the preparation work before designing a prototype has been completed. The next step is to properly select design elements and creatively alter them.


629708.tab.0020

Sample N15Weightings

Design categoryDesign elementsPCC ( ) PCC ( ) PCC ( )

X1X11−0.1400.1660.471
X2 X230.0000.0000.000
X3 X331.0921.2350.940
X4 X420.0000.0000.000
X5 X510.0000.0000.000
X6 X620.0000.0000.000
X7 X720.109−0.1450.061
X8 X810.6200.342−0.302
X9 X910.2620.1150.286
X10 X1020.1380.3310.332
X11 X112−0.0840.3080.445

Kansei word credits ( , , )
CSI15.350

Step 2 (D—critical design element selecting and developing). Based on the chosen high-score sample N15, we now change the type of design elements with zero or negative PCC and keep the other unchanged. It is noting that design elements with zero or negative PCC mean they have no or reverse influence on customer’s preference. Therefore, they should be considered as the key design parameters to be changed first in order to create a new product style that can rapidly promote customers’ preferences. Creative thinking can be actuated now from these key elements.

Step 3 (C—creativity thinking and conceptual design). After mature consideration, the creative alteration is done to the previously suggested key design elements. With the help of software SolidWorks, a conceptual design of new prototype is performed. The three-dimensional sketch of the new conceptually digital camera is shown in Figure 4.

Step 4 (A-CSI evaluation and modification, product Assurance). After several times of modification based on the aesthetics consideration and human usage of hereafter possible manufacturing process, the final model of a new digital camera is obtained, as shown in Figure 5.

3.5.2. Verification

To evaluate the design results through the operation of the proposed KKBDCA design scheme, an investigation is done to 30 subjects to evaluate the quality-sufficiency customers’ preferences. The obtained results are shown in Table 8. Comparing the CSI value of new designed camera with the original sample (No. p15), it is found that a 13%  increase in CSI is obtained. This reveals that a satisfying result is attended while using the proposed innovative KKBDCA product design procedure.


Product CSI

Design reference (N15) 15.350
New design
(KKBDCA)
17.356
Enhancement24.94%11.46%1.79%13.01%

4. Conclusion

This study aims to provide a design methodology to approach customer satisfaction more closely so as to rise up the possibility of customer’s decision for buying the designed merchant. The proposed methodology, called KKBDCA, includes the modified Kano model, the Kansei engineering, the Quantum Theory I, and an innovative design procedure BDCA. A major conclusion is drawn as follows.(1)Firstly, in the Kano model, the horizontal coordinate variables, that is, the quality factors, were modified as customer preferences (i.e., Kansei words). These influential quality factors were found as usability, aesthetics, and innovation. Then their weighting on customer satisfaction and Kano’s classification were determined according to the questionnaire survey results.(2)In Kansei manipulation, the target products, digital cameras, were collected and classified. Totally 60 effective samples were obtained and divided into 6 categories. Eleven design features of cameras were drawn from these sample representatives. According to the Kansei evaluation results of product design features with respect to each Kansei word for the 60 samples, the QT1 mapping model was built. Then a verification test was performed, and a good prediction result was obtained.(3)In the last stage, an innovative product design procedure was proposed. Based on the viewpoints of low-weighting (including zero and negative weighting), design elements should be highly modified so as to more effectively and rapidly enhance customer satisfaction, and a brand new camera was thus designed. Meanwhile, to identify our proposed design procedure, a verification test for the overall customer satisfaction was done and a satisfying result was obtained.

The proposed integrated procedure not only extends the past Kansei evaluation results to really designing a new product but also provides a more effective approach to meet the customer satisfaction.

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Copyright © 2013 Kun-Chieh Wang and Fang-Rong Ju. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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