• 한국사회복지학
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• 제42권
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• pp.254-289
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• 2000

This study conducted a step-wise discriminant analysis to determine which variables play key roles in distinguishing among 3 mutually exclusive delinquent groups - disclosed delinquency group, closed delinquency group, and no delinquency group - and to 'develop a procedure for predicting group membership for new cases whose group membership is undetermined. Variables included in this study were collected by the review of previous empirical studies, which were identified as related to juvenile delinquency. The variables can be classified as character-related variables, family-related variables, school-related variables, peer-related variables, and socioeconomic variables. A sample of 693 youths were employed to conduct the statistical analysis. Out of 35 possible predictors of juvenile delinquency 14 variables were included in the pool of predicting variables. This study used a hold-out sample (n=300) to test if the linear discriminant function classify cases correctly into one of 3 groups. The percentage of cases classified correctly by the discriminant function was turned out to be acceptable in the area of social sciences. Discussions and suggestions were provided in terms of prevention and intervention for juvenile delinquency with focus on the 14 predictor variables.

• 한국수산과학회지
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• 제7권2호
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• pp.91-97
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• 1974

북태평양의 백연어에는 카나다, 아라스카, 소련 및 일본의 네 계통이 있고, 소련과 일본의 아시아계는 경도$180^{\circ}$ 이서 해역에 분포하는 것으로 알려져 있다. 북태평양의 서방 해역의 백연어의 계통을 추적한다는 것은 공해상에서 어획된 백연어의 형질 측정치에 대해서 그것이 소련과 일본의 두 모집단의 어느 쪽으로부터 얻어진 것인가를 판별하는 문제에 귀착된다. 이 때 각 개체에 대해 관찰된 각 형질을 두 모집단간에 개별 비교한 결과를 종합하여 계통을 판별하는 것보다는, 이들 다수의 형질의 일차변환에 의해 각 형질에 나타나는 공통의 변동양상을 적절히 나타내고, 한편 두 모집단간의 차를 가장 확실히 표현하는 새로운 변량을 구하며, 이 새 변량에 의해 백연어의 계통을 판정하는 방법이 보다 높은 신뢰도를 기대할 수 있을 것이다. 본 연구에서 일본의 혹가이도와 소련의 캄차카반도의 일곱 하천으로부터 총 476개체의 백연어의 산란군(Fig.1, Table 1)으로부터 채집한 비늘의 첫 해의 연륜에 있어서 폭과 성장선 수의 두 형질을 측정하여, 선형판별함수를 구해, 이것이 북태평양 서방 해역에 분포하는 백 연어의 계통을 분리하는 데에 있어서 얼마나 유효한가를 조사했다. 정확한 판별 분석을 위해서 두 형질이 두 모집단간에 있어서 동일한 분산 및 공분산을 가진 다변량 정규분포를 하고 있는가를 검토하여 두 형질이 판별 분석에 적합함을 확인했다(Table 2,3 및 4). 구해진 선형판별함수 $Y=0.4803\;X_{1}+0.01156\;X_2$($X_1$은 성장선의 수, $X_2$는 폭)는 북태평양 서방 해역에 분포하는 백연어의 약 $80\%$를 일본계와 소련계로 정확히 분리했다(Fig. 2). 두 형질중 성장신의 수만으로써도 두 형질로부터 구한 선형판별함수에 의했을 때와 거의 동일한 확률로 계통을 분리할 수 있음을 알았다.

• 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.

• Ocean and Polar Research
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• 제35권3호
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• pp.239-247
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• 2013

Digital image processing is a process to analyze a large volume of information on digital images. In this study, Artemia hatching rate was measured by automatically classifying and counting cysts and larvae based on color imaging data from cyst hatching experiments using an image processing technique. The Artemia hatching rate estimation consists of a series of processes; a step to convert the scanned image data to a binary image data, a process to detect objects and to extract their shape information in the converted image data, an analysis step to choose an optimal discriminant function, and a step to recognize and classify the objects using the function. The function to classify Artemia cysts and larvae is optimally estimated based on the classification performance using the areas and the plan-form factors of the detected objects. The hatching rate using the image data obtained under the different experimental conditions was estimated in the range of 34-48%. It was shown that the maximum difference is about 19.7% and the average root-mean squared difference is about 10.9% as the difference between the results using an automatic counting (this study) and a manual counting were compared. This technique can be applied to biological specimen analysis using similar imaging information.

• 교육시설
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• 제4권4호
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• pp.29-41
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• 1997

The objective of this paper is to construct a model to be used in deciding whether to repair or rebuild school buildings is depending on their ages and other factors. The theme of this paper is the age is the main variable but other factors such as floor, innerwall, ceiling, door, inner window of the class room, outer window of the class room, inner window of the corridor, outer window of the corridor, middle window between the classroom and the corridor, light, heater, speaker, fire protection sensor, TV monitor, and telephone status would influence the final decisions. This paper employs an experimental case study method. Using the stepwise, statistical, classification method commonly used in discriminant analysis, it evaluates 12,766 rooms of 87 different high schools in Seoul. The result of this study indicates that some critical variables influencing the final decisions are the status of TV monitor, middle window between the classroom and the corridor, light, inner window of the corridor, fire protection sensor, innerwall, speaker utensil, outer window of the class room, and door of the class room. This paper also suggests a linear discriminant function will be used for this kind of studies. Finally the paper recommends policies with respect to the variables and discriminant functions evaluated.

• 한국식품과학회지
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• 제46권1호
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• pp.1-6
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• 2014

가공방식을 달리한 커피 원두와 분말을 대상으로 향기패턴 분석한 결과 커피 분말의 경우 washed coffee, pulped natural coffee, natural coffee 순으로 향이 높은 것으로 나타났다. 다음으로는 결점원두를 대상으로 통계 처리한 결과 일반원두에 비해서 향 함량이 낮은 것으로 나타났다. 이러한 결과는 향후 커피 원두의 품질관리 및 평가에 적용될 수 있음을 확인하였고 향후 전자코가 커피원두의 등급을 매기는 커피원료전문가(Q-grader)로서의 역할이 기대된다.

• Journal of Yeungnam Medical Science
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• 제10권1호
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• pp.48-57
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• 1993

1989년 1월부터 1992년 12월까지 영남대학교 외과대학 부속병원 정신과에 입원한 만성 정신분열증 71명, 급성 정신분열증 59명 그리고 정상집단 87명을 대상으로 하여 아이젱크 성격차원 검사중에서 정신병적 경향성을 중심으로 연구한 결과는 다음과 같다. 정신분열증 환자에서 만성 정신분열증 집단과 급성 정신분열증 집단간에는 차이를 보이지 않았으나 정상집단과 정신분열증 집단간에는 정신분열증 집단에서 정신병적 경향성이 정상집단보다 높은 것으로 나타났다. 아이젱크 성격차원 검사를 사용하여 정상집단과 정신분열증 집단간에 판별분석을 한 결과 정신분열증 집단과 정상집단을 판별하는데에 정신병적 경향성 차원이 유의한 것으로 나타났다. 따라서 종래의 성격검사와 같이 단순한 성격특질을 측정하는 것이 아닌 성격차원을 측정하는 검사인 아이젱크 성격차원 검사중 정신병적 경향성은 정신분열증을 진단, 분류하는데 유용한 것으로 시사된다.

• 한국음향학회지
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• 제41권6호
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• pp.662-667
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• 2022

음악 유사도 계산은 음악 검색 서비스 구현에서 가장 중요한 요소 중 하나이다. 본 논문은 커버곡 검색의 성능을 제고하기 위한 음악 유사도 학습에 대해서 다룬다. 음악 유사도 함수를 유도하는 데 확률적 선형 판별 분석을 이용하여 잠재 음악 공간을 구한다. 잠재 음악 공간은 같은 커버곡 간의 거리는 줄이고 다른 곡 간의 거리는 크게 되도록 학습한다. 추출된 음악 특징이 잠재 음악 변수에서 생성되었다는 가정 하에 확률 모델을 구하고, 음악의 동질성 여부를 가설검증하여 음악 유사도 함수를 유도한다. 두 가지 커버곡 실험 데이터셋에서 성능 비교를 수행하여 제안한 음악 유사도 함수가 커버곡 검색 성능을 개선시킬 수 있음을 보였다.

• Journal of Preventive Medicine and Public Health
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• 제28권3호
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• pp.640-650
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• 1995

After the introduction of National Medical Insurance in 1989, the medical demand has rapidly increased. The impact of increased medical demand was followed by an increase in the number of claims in need of review. We studied a new, fair method for reducing the number of claims reviewed. We analysed 90,583 outpatient claims submitted between September and October; claims were made for services given August of 1994. We finally suggested a screening system for claims review using a statistical method of discriminant analysis of the medical costs. The results were as follows. 1. In the cut-off group, age, days of medication, number of hospital or clinic visits, and total charge were significantly high. The cut-off rates according to the hospital-type and existence of accompanied disease were significantly different 2. According to ICD, the cut-off rate was highest in peripheral enthesopathies and allied syndromes(20.76%), lowest in acute sinusitis(0.93%). The mean charges were significantly different according to ICD and existence of cut-off. 3. We build discriminant functions by ICD with such discriminant variables as patient age, sex, existence of accompanied disease, number of hospital or clinic visits, and 9 detailed hospital or clinic charges included in claim. 4. We applied the discriminant function for screening those claims that were expected to be cut-off. The sensitivities comprised from 40% to 70%, and specificities from 70% to 95% by ICD. Acute rhinitis had highest sensitivity(100.00%) and other local infections of skin and subcutaneous tissue had highest specificity(98.45%). The expected number of cut-off was 17,762(19.61%). The total sensitivity was 49.62%, the total specificity was 82.57% and the error rate was 19.66%. We lacked economic analysis such as cost-benefit analysis. But, if the new method of screening claims using discriminant analysis were applied, the number of claims in need of review will reduce considerably.

• 한국물환경학회지
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• 제23권2호
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• pp.260-265
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• 2007

This study was carried out to complement water quality standards and to establish new concept for water quality standards reflecting current state of water quality in small streams. By this purpose, discriminant analysis was performed and Water Quality Level Model (WQLM) was developed using the data such as EC, BOD, $COD_{Mn}$, SS, T-N, T-P, $NH_3-N$ in 224 agricultural streams. To give water quality level for water quality parameters, it divided into 20% respectively in the order of excellent water quality. On the basis of the lowest water quality level, water quality level of small streams is granted. As a result of it, number of stream corresponding to Level I was no, Level II was 2 streams, Level III was 22 streams, Level IV was 70 streams, and Level V was 130 streams. Average of water quality in each level was the highest in Level V. EC, SS, and T-N of 7 parameters were selected in variance concerned water quality level. By standardized canonical discriminant function coefficient, EC of three variances was the highest in 0.625 at the discriminant power. The next was T-N (0.509), SS (0.414). By discriminant function for water quality level, Level II was equal to $-2.973+19.376{\times}(EC)+0.647{\times}(T-N)+0.009{\times}(SS)$, Level III was equal to $-3.288+19.190{\times}(EC)+0.733{\times}(T-N)+0.041{\times}(SS)$, Level IV was equal to $-4.462+27.097{\times}(EC)+0.792{\times}(T-N)+0.053{\times}(SS)$, and Level V was equal to $-9.117+40.040{\times}(EC)+1.305{\times}(T-N)+0.111{\times}(SS)$. As a result of test at real agricultural watershed of Jeongan and Euidang in Gongju city, the fitness of WQLM was high to 88.78%. But, to get accomplished water quality assessment more exactly in agricultural streams, we had to concentrate and get vast data, and WQLM was modified and complemented continually.