The Influence of Store Images of Discount Stores on Shopping Values and Shopping Satisfaction: The Roles of Perceived Retail Crowding (대형마트의 점포이미지가 쇼핑가치 및 쇼핑만족에 미치는 영향: 지각된 혼잡의 역할)
- Bae, Byung-Ryul
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- Journal of Distribution Research
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- v.17 no.4
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- pp.1-27
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- 2012
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Conceptualization of store image have been suggested in the past by many marketing scholars. The dominant perspective about store image is treated as the results of a multi-attribute model. Store image is expressed as a function of the salient attributes of a particular store that are evaluated. Though, there is a little confusions about what elements compose the store image, most scholars agree that merchandise, service, atmosphere, physical facilities, comfort, and location are generally accepted elements as store image. A considerable researches support that shopping can provide both hedonic and utilitarian value. Hedonic shopping value reflects the value received from fantasy and emotive aspects of shopping experience, while utilitarian shopping value reflects the acquisition of products. These two types of shopping value can affect shopping satisfaction. This study examines the relationships among stores images(store atmosphere, salespeople services, facilities, product assortment, and store location), shopping values(utilitarian shopping value and hedonic shopping value), and shopping satisfaction based on discount stores (E-Mart, Home plus, and Lotte Mart). The author hypothesized that five store image components affect shopping values, and these shopping values affect shopping satisfaction. The author focused on the roles of perceived retail crowding between these relationships. Specifically, the author hypothesized that perceived retailing crowding moderated the relationship between shopping values and shopping satisfaction. The author also hypothesized the direct effect of perceived retail crowding on shopping satisfaction. Finally, the author hypothesized that five store image components affect directly shopping satisfaction. Research model is presented in
. To test model and hypotheses, data were collected from 114 consumers located mid-size city in local area. The author employs PLS methodology (SmartPLS 2.0) to test hypotheses. Data analysis results indicate that among five store images salespeople services, and store location affect utilitarian shopping value. Store atmosphere, salespeople services, and store location affect hedonic shopping value. Two shopping values affect shopping satisfaction. Hedonic shopping value affect more shopping satisfaction than utilitarian shopping value. Data analysis results is presented in. The author examines the moderating effects of perceived retail crowding between shopping values and shopping satisfaction. Results indicate that there are no moderating effects between shopping values and shopping satisfaction. Moderating effects of perceived retail crowding between utilitarian shopping value and shopping satisfaction are presented in
. Moderating effects of perceived retail crowding between hedonic shopping value and shopping satisfaction is presented in
. The author examines the direct effect of perceived retail crowding on shopping satisfaction. Results are presented in . The author analyzed the relationship between perceived retail crowding and shopping satisfaction using WarpPLS 3.0 which can analyze the non-linear relationship. Result indicates that perceived retail crowding affects directly shopping satisfaction and there is a non-linear relationship between them. Among five store image components, store atmosphere and salespeople services affect directly shopping satisfaction. The author describes about the managerial implications, limitations, and future research issues.
Optimization of Support Vector Machines for Financial Forecasting (재무예측을 위한 Support Vector Machine의 최적화)
- Kim, Kyoung-Jae;Ahn, Hyun-Chul
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- Journal of Intelligence and Information Systems
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- v.17 no.4
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- pp.241-254
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- 2011
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Financial time-series forecasting is one of the most important issues because it is essential for the risk management of financial institutions. Therefore, researchers have tried to forecast financial time-series using various data mining techniques such as regression, artificial neural networks, decision trees, k-nearest neighbor etc. Recently, support vector machines (SVMs) are popularly applied to this research area because they have advantages that they don't require huge training data and have low possibility of overfitting. However, a user must determine several design factors by heuristics in order to use SVM. For example, the selection of appropriate kernel function and its parameters and proper feature subset selection are major design factors of SVM. Other than these factors, the proper selection of instance subset may also improve the forecasting performance of SVM by eliminating irrelevant and distorting training instances. Nonetheless, there have been few studies that have applied instance selection to SVM, especially in the domain of stock market prediction. Instance selection tries to choose proper instance subsets from original training data. It may be considered as a method of knowledge refinement and it maintains the instance-base. This study proposes the novel instance selection algorithm for SVMs. The proposed technique in this study uses genetic algorithm (GA) to optimize instance selection process with parameter optimization simultaneously. We call the model as ISVM (SVM with Instance selection) in this study. Experiments on stock market data are implemented using ISVM. In this study, the GA searches for optimal or near-optimal values of kernel parameters and relevant instances for SVMs. This study needs two sets of parameters in chromosomes in GA setting : The codes for kernel parameters and for instance selection. For the controlling parameters of the GA search, the population size is set at 50 organisms and the value of the crossover rate is set at 0.7 while the mutation rate is 0.1. As the stopping condition, 50 generations are permitted. The application data used in this study consists of technical indicators and the direction of change in the daily Korea stock price index (KOSPI). The total number of samples is 2218 trading days. We separate the whole data into three subsets as training, test, hold-out data set. The number of data in each subset is 1056, 581, 581 respectively. This study compares ISVM to several comparative models including logistic regression (logit), backpropagation neural networks (ANN), nearest neighbor (1-NN), conventional SVM (SVM) and SVM with the optimized parameters (PSVM). In especial, PSVM uses optimized kernel parameters by the genetic algorithm. The experimental results show that ISVM outperforms 1-NN by 15.32%, ANN by 6.89%, Logit and SVM by 5.34%, and PSVM by 4.82% for the holdout data. For ISVM, only 556 data from 1056 original training data are used to produce the result. In addition, the two-sample test for proportions is used to examine whether ISVM significantly outperforms other comparative models. The results indicate that ISVM outperforms ANN and 1-NN at the 1% statistical significance level. In addition, ISVM performs better than Logit, SVM and PSVM at the 5% statistical significance level.
Ultrasound-Guided Local Steroid Injection Therapy for Acute Calcific Tendinitis of Shoulder (초음파를 이용한 급성 극상근 석회화 건염의 스테로이드 국소 주사 요법)
- Kim, Jung-Man;Nam, Ho-Jin;Ra, Ki-Hang;Kang, Min-Ku
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- The Journal of Korean Orthopaedic Ultrasound Society
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- v.2 no.2
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- pp.85-89
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- 2009
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Purpose: To analyze the clinical outcome after ultrasound guided multiple dry needlings and local steroid injection for acute calcific tendinitis of shoulder. Materials and Methods: Twenty patients with acute episode of pain by calcific tendinitis of shoulder with average age 58.2 (50~70 years) and follow-up of 18 months in average (range, 12~24) were included in study. There were 18 patients with right and 2 with left sided involvement. All patients had calcific deposits in the supraspinatus tendon. All patients underwent standardized nonoperative treatment protocol, consisting of 5~12 MHz high resolution ultrasound guided multiple dry needlings with 18 guage needle, followed by 2% lidocaine 1cc and 40 mg/ml depomedrol 1cc injection at site of calcific tendinitis. The outcome was assessed by UCLA shoulder score, range of motion and VAS score. A statistical analysis with ANOVA and Tukey's post-hoc test with the significance level at 5% was performed using SAS 9.1 software (SAS Institute, Cary, NC). Results: All patients got continuous relief of pain right after the procedures until final follow-up. Before the procedures, the UCLA scores were fair in 15 patients and poor in 5. After the procedures, the UCLA scores were excellent in 16 patients and good in 4. All cases revealed no limitation of shoulder function. The average VAS score decreased from 8.9 before the procedures to 0.5 at final follow-up (p<0.0001). No complication was encountered. Conclusion: An ultrasound guided local steroid injections following multiple dry needlings would be one of the useful treatment modality for the acute calcific tendinitis of shoulder.
Cerebral Activity by Motor Task in Welders Exposed to Manganese through fMRI (fMRI를 이용한 망간 노출 용접공의 운동수행에 따른 뇌 활성도 평가)
- Choi, Jae-Ho;Jang, Bong-Ki;Lee, Jong-Wha;Hong, Eun-Ju;Lee, Myeong-Ju;Ji, Dong-Ha
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- Journal of Environmental Health Sciences
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- v.37 no.2
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- pp.102-112
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- 2011
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Objectives: The purpose of this study is to analyze the effects of chronic exposure by welders to manganese (Mn) through an analysis of the degree of brain activity in different activities such as cognition and motor activities using the neuroimaging technique of functional magnetic resonance imaging (fMRI). The neurotoxic effect that Mn has on the brain was examined as well as changes in the neuro-network in motor areas, and the usefulness of fMRI was evaluated as a tool to determine changes in brain function from occupational exposure to Mn. Methods: A survey was carried out from July 2010 to October 2010 targeting by means of a questionnaire 160 workers from the shipbuilding and other manufacturing industries. Among them, 14 welders with more than ten years of job-related exposure to Mn were recruited on a voluntary basis as an exposure group, and 13 workers from other manufacturing industries with corresponding gender and age were recruited as a control group. A questionnaire survey, a blood test, and an fMRI test were carried out with the study group as target. Results: Of 27 fMRI targets, blood Mn concentration of the exposure group was significantly higher than that of the control group (p<0.001), and Pallidal Index (PI) of the welder group was also significantly higher than that of the control group (p<0.001). As a result of the survey, the score of the exposure group in self-awareness of abnormal nerve symptoms and abnormal musculoskeletal symptoms was higher than those of the control group, and there was a significant difference between the two groups (p<0.05, respectively). In the correlation between PI and the results of blood tests, the correlation coefficient with blood Mn concentration was 0.893, revealing a significant amount of correlation (p<0.001). As for brain activity area within the control group, the right and the left areas of the superior frontal cortex showed significant activity, and the right area of superior parietal cortex, the left area of occipital cortex and cerebellum showed significant activity. Unlike the control group, the exposure group showed significant activity selectively on the right area of premotor cortex, at the center of supplementary motor area, and on the left side of superior temporal cortex. In the comparison of brain activity areas between the two groups, the exposure group showed a significantly higher activation state than did the control group in such areas as the right and the left superior parietal cortex, superior temporal cortex, and cerebellum including superior frontal cortex and the right area of premotor cortex. However, in nowhere did the control group show a more activated area than did the exposure group. Conclusions: Chronic exposure to Mn increased brain activity during implementation of hand motor tasks. In an identical task, activation increased in the premotor cortex, superior temporal cortex, and supplementary motor area. It was also discovered that brain activity increase in the frontal area and occipital area was more pronounced in the exposure group than in the control group. This result suggests that chronic exposure to Mn in the work environment affects brain activation neuro-networks.
The Role of Inhaled Corticosteroid in the Management of Chronic Cough (만성 기침에서 스테로이드 흡입제의 역할)
- Lee, Kyung-Hun;Jang, Seung Hun;Lee, Jung-Hwa;Eom, Kwang-Seok;Bahn, Joon-Woo;Kim, Dong-Gyu;Shin, Tae Rim;Park, Sang Myon;Lee, Myung-Gu;Kim, Chul-Hong;Hyun, In-Gyu;Jung, Ki-Suck
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- Tuberculosis and Respiratory Diseases
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- v.60 no.2
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- pp.221-227
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- 2006
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Background : Cough may be a consequence of bronchial hyperresponsiveness or inflammation. Empirical treatment is important in this context because it difficult to verify the obvious cause of cough using laboratory tests, Corticosteroid has a nonspecific anti-inflammatory effect, and can be used for cough management. However, its response rate has not yet been fully elucidated. This study investigated the short- term effects of inhaled corticosteroid on chronic cough Methods : Patients with chronic cough with a normal chest radiograph and a pulmonary function test were enrolled. Cases with a prior respiratory infection within 8 weeks, a history of bronchial asthma, objective wheezing on examination, subjective symptoms of gastroesophageal reflux or taking an ACE inhibitor were excluded. On the first visit, a methacholine bronchial provocation test, spontaneous sputum eosinophil count performed twice and a paranasal sinus radiograph were checked, and the patients were treated with budesonide turbuhaler
$800{\mu}g/day$ for ten days. The primary outcome measure was a decrease in the cough score after treatment. Results : Sixty nine chronic coughers were finally analyzed. The final diagnoses by the routine tests were as follows: bronchial asthma 13.0%, eosinophilic bronchitis 18.8%, paranasal sinusitis 23.2% and non-diagnostic cases 53.6%. The following responses to the inhaled corticosteroid were observed: definite responders, 76.8%, possible responders, 2.9% and non-responders, 20.3%. The response rate was not affected by the final diagnosis even in the non-diagnostic cases. There were minimal adverse drug related effects during the empirical treatment. Conclusion : Routine objective tests such as methacholine provocation, sputum eosinophil count and simple radiographs were notare not suitable for diagnosing chronic cough Therefore, empirical treatment is important. Short term inhaled corticosteroid is effective and can guide a further treatment plan for chronic cough.
Accuracy of Spirometry at Predicting Restrictive Pulmonary Impairment (제한성 환기장애의 진단에서 폐활량검사의 정확성)
- Ahn, Young Mee;Koh, Won-Jung;Kim, Cheol Hong;Lim, Seong Yong;An, Chang Hyeok;Suh, Gee Young;Chung, Man Pyo;Kim, Hojoong;Kwon, O Jung
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- Tuberculosis and Respiratory Diseases
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- v.54 no.3
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- pp.330-337
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- 2003
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Background : Low spirometric forced vital capacity(FVC) in conjunction with a normal or high ratio of the forced expiratory volume at 1 second to the forced vital capacity(
$FEV_1$ /FVC%) has traditionally been classified as a restrictive abnormality. However, the gold-standard diagnosis of a restrictive pulmonary impairment requires a measurement of the total lung capacity (TLC). This study was performed to determine the predictive value of spirometric measurements of the FVC for diagnosing a restrictive pulmonary abnormality. Methods : Test results from 1,371 adult patients who undertook both spirometry and lung volume measurements on the same visit from January 1999 to December 2000 were enrolled in this study. The test values for the FVC, the TLC that was below 80% of predicted value, and a$FEV_1$ /FVC% that was below 70%, were classified as being abnormal. Results : Of the 1,371 patients, 353 patients had a reduced a FVC. Of these patients, 186 patients had a reduced TLC. Therefore, the positive predictive value was 52.7%. Of the 196 patients with a normal$FEV_1$ /FVC% and a reduced FVC, 148(75.5%) patients had a lower TLC. Thirty eight (24.2%) patients out of 157 patients with a low$FEV_1$ /FVC% and a low FVC showed a restrictive defect. Conclusion : Spirometry is useful to rule out a restrictive pulmonary abnormality, but a restrictive pattern on the spirometry dose not mean there is a true restrictive disease. For the patients with a low FVC, TLC measurements are essential for diagnosing a restrictive pulmonary impairment.
Comparison of Dynamic Stereoacuity According to Dominant Eye and Degree of Dominant Eye (우세안의 방향과 강도에 따른 동적 입체시 비교)
- Shim, Moon-Sik;Shim, Hyun-Suk;Kim, Young-Cheong
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- Journal of Korean Ophthalmic Optics Society
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- v.21 no.3
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- pp.227-233
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- 2016
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Purpose: On this study, we compared the relationship of dynamic stereoacuity according to the dominant eye, degree of dominant eye, and dominant agreement eye and hand. Methods: For 130 adults (male 70, female 60), mean age of
$21.06{\pm}2.21years$ old, dominant eye, degree of dominant eye were measured by objective examination by using the diameter$3.8cm{\times}3.8cm$ thin ring, the dynamic stereoacuity were measured by three-rods test (iNT, Korea). Results: Dynamic stereoacuity according to the dominant eye was center dominant eye without dominance was$14.97{\pm}13.80sec$ of arc, right eye$22.10{\pm}20.01sec$ of arc, left eye$22.31{\pm}20.39sec$ of arc. Dynamic stereoacuity was better when there was no dominance, but the correlation of the dominant eye with dynamic stereoacuity was very low. When Dynamic stereoacuity was separated by in the Center, Mild, Strong, dynamic stereoacuity was$14.97{\pm}13.80sec$ of arc,$20.76{\pm}15.73sec$ of arc and$24.45{\pm}25.60sec$ of arc respectively. The dynamic stereoacuity results were worse when dominance was stonger. However dynamic stereoacuity was better than Center when the degree of dominant eye was rather strong in the dominant left eye. Dynamic stereoacuity according to the dominant eye and hand showed that right eye and hand was$22.63{\pm}20.54sec$ of arc, left eye and hand was$17.36{\pm}10.13sec$ of arc, right eye and left hand was$14.79{\pm}7.05sec$ of arc, left eye and right hand was$22.97{\pm}21.42sec$ of arc so dynamic stereoacuity was comparatively good when the dominant hand was left. Conculsions: Correlation between the dynamic stereoacuity according to the dominant eye, degree of dominant eye was low, however when degree of dominant eye was Center 14.97 sec of arc, Strong 24.45 sec of arc, the dynamic stereoacuity tended to worse when degree of dominant eye was strong. As a result, dominant eye, degree of dominant eye would have to be considered in a more comfortable binocular balance between prescribed for the wearer in binocular vision correction in binocular function such stereoacuity, sports vision training, presbyopia correction and mono vision.
Evaluation on Reproducibility of Low-Dose Kidney Scan in Dynamic Kidney Scan (동적신장검사에서 저선량을 사용한 신장검사의 재현성 평가)
- Lee, Jaesang;Lee, Kyuchan;Lee, Seunghwan;Bae, Seongbok;Park, Jongyeop
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- The Korean Journal of Nuclear Medicine Technology
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- v.20 no.1
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- pp.59-65
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- 2016
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Purpose Dynamic kidney scan is a typical imaging technique that visualizes kidney function. Reproducibility of dynamic kidney scans has been evaluated by comparing low-dose kidney scans with low-dose radiopharmaceutical and standard dynamic kidney scan. With this comparative study, if reproducibility is superb, the dynamic kidney scan method with reduced radioactivity to patients is to be utilized and radiation exposure to patient is to be reduced. Materials and Methods For gamma camera, Orbiter, SymbiaE (Siemens, Germany) was used. Among patients who had used 370 Mbq (10 mCi) from January of 2013 to February 2014 and other patients who had used 185 Mbq (5 mCi) from March of 2014 to July of 2015 with identical condition, 21 subjects using DTPA and 20 subjects using
$MAG_3$ , 41 subjects in total, had been selected as subjects for data. From renogram of the result image, frame of the peak point was selected. Then, region of interest of kidney and background had been selected and Kidney to Background Ratio has been calculated for comparison. Results In tests using DTPA, kidney to background ratio when using 370 Mbq was$5.67{\pm}0.8$ at average while it was$5.62{\pm}0.87$ when using 185 Mbq, which didn't show much difference. Also in the tests using$MAG_3$ , kidney to background ratio when using 370 Mbq was$14.95{\pm}2.58$ at average and$14.56{\pm}2.02$ in 185 Mbq, which neither showed much difference. In paired sample t-test, p-value was 0.566 in DTPA and 0.363 in$MAG_3$ , which confirmed that there was no difference between the groups. Conclusion In identical patients, when dose was decreased from 370 Mbq to 185 Mbq, reproducibility of dynamic kidney scan was proven to be excellent. Low-dose Dynamic kidney scan can achieve results with fine reproducibility without improvement in performance of gamma camera and is expected to reduce radiation exposure to patient.
Continuity Simulation and Trend Analysis of Water Qualities in Incoming Flows to Lake Paldang by Log Linear Models (로그선형모델을 이용한 팔당호 유입지류 수질의 연속성 시뮬레이션과 경향 분석)
- Na, Eun-Hye;Park, Seok-Soon
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- Korean Journal of Ecology and Environment
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- v.36 no.3 s.104
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- pp.336-343
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- 2003
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Two types of statistical models, simple and multivariate log linear models, were studied for continuity simulation and trend analysis of water qualities in incoming flows to Lake Paldang. Water quality is a function of one independent variable (flow) in the simple log linear model, and of three different variables (flow, time, and seasonal cycle) in multivariate model. The independent variables act as surrogate variables of water quality in both models. The model coefficients were determined by the monthly data. The water qualities included 5-day Biochemical Oxygen Demand (
$BOD_5$ ), Total Nitrogen (TN), and Total Phosphorus (TP) measured from 1995 to 2000 in the South and the North branches of Han River and the Kyoungan Stream. The results indicated that the multivariate model provided better agreements with field measurements than the simple one in a31 attempted cases. Flow dependency, seasonality, and temporal trends of water quality were tested on the determined coefficients of the multivariate model. The test of flow dependency indicated that BOD concentrations decreased as the water flow increased. In TN and TP concentrations, however, there were no discernible flow effects. From the temporal trend analyses, the following results were obtained: 1) no trends on BOD at all three upstreams, 2) increase on TN at the South Branch and the Kyoungan Stream, 3)decrease on TN at the North Branch,4) no trends on TP at the North and the South Branches and 5) increase on TP at the Kyoungan Stream by 3 to 8% per years. The seasonality test showed that there were significant seasonal variations in all three water qualities at three incoming flows.
Sensory and Physical Characteristics of Hwajeun Depended on the Various Levels of Oil Amounts and frying Time (기름의 양과 지지는 시간에 따른 화전의 관능적 및 물리적 특성)
- 이승현;박정은;장명숙
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- Korean journal of food and cookery science
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- v.19 no.6
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- pp.765-771
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- 2003
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The aim of this study was to standardize the various methods and recipes of Hwajeun (glutinous rice pancake with flower) appeared in the literature. For this purpose, the effects on the sensory and rheological characteristics of Hwajeun in terms of the various levels of oil and frying times were investigated. This experiment consisted of a sensory evaluation in terms of the acceptance (color, flavor, oily feeling, softness, chewiness, adhesiveness, taste and overall preference) and objective evaluation performed by a texture analyzer, a color difference meter and measurements of the water content and oil absorption. The moisture content of the treatments as a function of the frying time, S7, showed a significantly(p<0.01) low value, and the oil absorption of the Hwajeun made with different frying times increased in proportion to the increment of the frying time(p<0.001). In terms of color, the b value of the Hwajeun made with 16g oil for frying showed a higher value than the others. In the two bite compression test, the hardness of the Hwajeun made with 4g oil for frying showed a significantly (p<0.001) high value among the S2 and S3 samples. As a result of the sensory evaluation for the Hwajeun made with various amounts of oil and frying times, the Hwajeun made with 16g oil for frying and a 2 min frying time for each side (S6) was the most preferred in terms of the softness, chewiness, taste and overall preference of the sensory evaluation
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