• 센서학회지
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• 제24권4호
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• pp.258-263
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• 2015

In order to prevent drink-driving by detecting concentration of alcohol from driver's exhale breath, twenty chemical sensors fabricated. The one of purposes for sensor array which consists of those sensors is to discriminate between target gas(alcohol) and interference gases($CH_3CH_2OH$, CO, NOx, Toluene, and Xylene). Wilks's lambda was presented to achieve above purpose and optimal sensors were selected using the method. In this paper, step-wise sensor elimination based on Euclidean distance was investigated for selecting optimal sensors and compared with a result of Wilks's lambda method. The selectivity and sensitivity of sensor array were used for comparing performance of sensor array as a result of two methods. The data acquired from selected sensor were analyzed by pattern analysis methods, principal component analysis and Sammon's mapping to analyze cluster tendency in the low space (2D). The sensor array by stepwise sensor elimination method had a better sensitivity and selectivity compared to a result of Wilks's lambda method.

• 한국산학기술학회논문지
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• 제15권2호
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• pp.979-988
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• 2014

본 연구는 간호사들이 인식한 안전 분위기와 업무환경을 포함한 조직의 특성과 투약오류보고장애요인간의 관련성을 검증하기 위한 연구이다. 수정된 안전 분위기, 업무환경, 투약오류보고장애 문항을 활용하여 7개 병원의 334명의 간호사들을 대상으로 하여 조사하였다. 자료수집기간은 2012년 9월 한달 간이었고, 서술적 통계, Pearson correlation coefficient, canonical correlation을 적용하였다. 조직의 특성은 투약오류보고장애와 세 가지 유의한 상관이 있었다. 첫 번째 정준상관계수는 .50(Wilks' ${\lambda}$=0.61, df=32, p<.001)이었고, 두 번째는 .35(Wilks' ${\lambda}$=0.81, df=21, p<.001), 세 번째는 .22(Wilks' ${\lambda}$=0.93, df=12, p=.018)이었다. 첫 번째 정준상관은 높은 안전 분위기와 업무환경이 오류보고에의 두려움을 제외한 투약오류보고와 관련이 있었다. 두 번째 식은 '의료인간의 안전 분위기'의 높은 지각과 높은 '병원에의 간호사 참여'와 '인적 자원의 적절성'은 낮은 '불안감'과 '행정자들의 반응'과 관련이 있었다. 투약오류보고장애를 위한 전략과 안전 분위기와 업무환경과 같은 조직의 특성의 진보가 적용되어야 한다.

• 한국조리학회지
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• 제14권1호
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• pp.21-38
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• 2008

This research aimed to analyze the differences in financial variables classifying chain restaurants. A total of 126 samples were drawn from financial statements for $2001{\sim}2006$. As a result of analysis, there was a significant difference in Pillai's Trace, Wilks' Lambda, Hotelling's Trace, and Roy's Largest Root values at the significant probability value(p<0.05) based on F value in terms of stability among chain restaurants. Difference was found only in current rate and liabilities in ANOVA. There was a great difference in current rate among institutional restaurants, fast food restaurants, and cafeterias. There was a significant difference in Pillai's Trace, Wilks' Lambda, Hotelling's Trace, and Roy's Largest Root values at the significant probability value(p<0.05) based on F value in terms of restaurants' profitability. In ANOVA, difference was found only in net profits to net sales. It was revealed that all factors showed no significant differences in multiple comparison. All multi-variant test statistics showed a significant difference in growth and turnover. ANOVA showed a significant difference in net sales growth rate, net profit growth rate, and total assets growth rate.

• 센서학회지
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• 제25권1호
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• pp.13-19
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• 2016

Nowadays, most major automobile manufacturers are very interested, and actively involved, in developing driver alcohol detection system for safety (DADSS) that serves to prevent driving under the influence. DADSS measures the blood alcohol concentration (BAC) from the driver's breath and limits the ignition of the engine of the vehicle if the BAC exceeds the reference value. In this study, to optimize the sensor array of the DADSS, we selected sensors by using three different methods, configured the sensor arrays, and then compared their performance. The Wilks' lambda, stepwise elimination and filter method (using a principal component) were used as the sensor selection methods [2,3]. We compared the performance of the arrays, by using the selectivity and sensitivity as criteria, and Sammon mapping for the analysis of the cluster type of each gas. The sensor array configured by using the stepwise elimination method exhibited the highest sensitivity and selectivity and yielded the best visual result after Sammon mapping.

• Communications for Statistical Applications and Methods
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• 제12권2호
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• pp.305-312
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• 2005

In the cluster analysis, Hotelling's $T^2$ can be used to estimate the unknown number of clusters based on the idea of multiple comparison procedure. Especially, its threshold is obtained according to the probability of committing the type one error. Examples are used to compare Hotelling's $T^2$ with other classical location test statistics such as Sum-of-Squared Error and Wilks' $\Lambda$ The hierarchical clustering is used to reveal the underlying structure of the data. Also related criteria are reviewed in view of both the between variance and the within variance.

• 패션비즈니스
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• 제4권3호
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• pp.103-114
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• 2000

The purpose of this study was to test the discriminant analysis model of Quick Response system and to examine the detailed relationship between each discriminant factor and Quick Response adoption. In this discriminant analysis model of Quick Response system, firm size, strategic type, product category, fashion trend, selling time and the Quick Response benefits were included as discriminant factors. Onehundred and two subjects were randomly selected for the survey study and discriminant analysis, descriptive analysis, t-test, and x square test were used for the data analysis. The results of this study were: 1. Wilks Lambda and F value support the discriminant analysis model that, taken together firm size, strategic type, product category, fashion trend, selling time and the Quick Response benefits significantly help to explain Quick Response adoption. 2. The importance of discriminant ability was, in order, firm size, the Quick Response benefits, women's wear, fashion trend, analyzer, selling time, reactor, defender and men's wear. 3. The discriminant function had the high hit ratio, so this can be well used for the classification of Quick Response adoption/nonadoption.

• 한국산학기술학회논문지
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• 제18권8호
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• pp.294-303
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• 2017

고령인구가 증가하면서 각종 노인성 만성질환 및 치매질환의 유병률 또한 빠르게 증가하고 있으며, 치매는 우리사회의 큰 관심 질환으로 대두되고 있다. 본 연구에서는 노인복지시설에서 거주하고 있는 인지장애 노인을 대상으로 비타민 보충제의 영양 강화요법이 경도인지기능 노인에게 미치는 효과를 보고자 하였다. 자료는 K지역에 위치한 노인복지시설 2개의 다른 건물에 입소한 노인 48명을 대상으로 각각 다른 건물에서 하나의 건물에서는 실험군 집단을 하나의 건물에서는 대조군 집단을 선정하였으며, 4,8,12주에 걸쳐 비타민 보충제를 복용한 후 호모시스테인 혈중농도와 인지기능을 평가하였다. 표집방법은 자료수집의 용이함을 고려하여 임의 표집방법을 이용분석을 위해 Chi-Square test, Fisher's Exact test와 independent t-test, Repeated Measure ANOVA, Contrast test, Repeated Measure ANCOVA, Wilks' lambda test를 실시하였으며, 인지기능 향상 효과에 대한 Contrast test를 실시한 결과, 12주차(p<.001) 에서 유의한 효과가 있는 것으로 나타났다. 경구 비타민제를 복용한 실험군의 인지기능 12주에서 대조군보다 각 시기별 차이를 분석한 결과 12주차(p<.05)에 실험군의 인지기능이 대조군보다 높게 나타났고, 호모시스테인 효과에 대한 12주(p<.01)에서 비타민제 복용이 효과가 유의하게 발생하여 대조군보다 호모시스테인이 감소한 것으로 나타났다. 결과적으로 경구비타민을 복용한 노인에게서 인지기능이 증가하였고, 호모시스테인 혈중농도가 주별 지속적으로 감소하였다. 이러한 결과는 치매로 갈 수 있는 경도인지장애 대상자들에게 비타민 보충제 복용은 상대적으로 비용이 저렴하고, 복용이 간편하여 추후 인지기능 저하 및 치매발생을 예방할 것으로 기대된다.

• 대한간호학회지
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• 제29권3호
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• pp.585-595
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• 1999

The purpose of this study was to examine the predictors of burnout among informal caregivers of older adults. One hundred thirty seven caregivers who had provided care to older adults over 60 years of age for more than one month were included in the study. Most of the caregivers were white (91%) and female (78%). Mean ages of the caregivers were 64 years and 78% of them were married. Seventy percent of the older adults suffered from Alzheimer and related disease. In this study, caregivers reported that they experienced burnout once a month. The scores of emotional exhaustion and reduced personal accomplishment of the caregivers were in the moderate burnout range. To examine the predictors of burnout, discriminant analysis was used. Caregivers were divided by two groups based on the sum of scores (cutpoint＝6) on three dimensions of burnout after each dimension was categorized into high(3), moderate(2), and low(1). Nine predictors were included in the analysis : Caregiver's age, employment status, Instrumental Activities of Daily Living (IADL) of the older adult, presence of dementia of the older adult, caregiver's empathy toward the older adult (emotional and cognitive), and 3 coping strategies (negative, problem-focused, cognitive reconstructioning). Caregivers who reported high burnout showed higher cognitive empathy toward the older adults than those who showed low burnout. Caregivers who experienced high burnout used negative coping more often, and cognitive reconstructioning coping and problem focused coping less often than their counterparts. Wilks' Lambda was .78 indicating that differences between the two groups were significant. Cognitive empathy and cognitive reconstructioning coping showed high standardized canonical discriminat function coefficients over .40. Discriminant function with 9 predictors correctly classified 71% of the sample. In conclusion, informal caregivers also experienced certain level of burnout. Cognitive empathy and coping strategies predicted burnout experience of the caregivers. Based on this study, nursing intervention to the informal caregivers to improve their cognitive empathy toward the older adults and to modify their coping strategies in a way to reduce burnout experience can be applied. Further research to develop effective nursing interventions for the purpose of reducing burnout experience by modifying predictors was suggested.

• 사상체질의학회지
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• 제33권3호
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• pp.16-28
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• 2021

Introduction The Sasang Urination Defecation Inventory was developed to analyze Sasang-type specific pathophysiological clinical symptoms, and its revised Sasang Urination Inventory (SUI) illustrated its clinical usefulness in Sasang type differentiation. However, the correlation with established clinical measures for its concurrent validity were not provided yet. Methods Total of 48 healthy university students were recruited to response Urogenital Distress Inventory-6 (UDI-6) and Overactive Bladder Symptom Score (OABSS) of Western medicine along with the SUI of traditional Korean medicine. The correlation coefficients between UDI-6 and OABSS and SUI were acquired with Pearson's correlation, and Analysis of Variance (ANOVA) and Profile Analysis were used to analyze significant differences in SUI subscale profiles of each Sasang types. Results The SUI-HSS of urogenital hypersensitivity correlated positively with OABSS (r=0.442, p<0.01), and the SUI-DIS of urinary discomfort positively with UDI-6 (r=0.289, p<0.05). Interestingly, the SUI-total was correlated positively with age (r=0.326), height (r=0.318) and weight (r=0.304). The SUI-DIS for urinary discomfort of So-Yang (9.48±2.11) type was significantly (p<0.05) higher than that of Tae-Eum (7.2±2.90) type. And SUI subscale profiles of each Sasang type were significantly (Wilks' Lambda=0.792, F=2.723, p=0.034) distinctive to each other. Discussion The acceptable convergent validity of SUI was shown using established measures of urogenital symptoms. The SUI might be used as an objective traditional Korean clinical measure for Sasang type differentiation and urological patients.