• Journal of Information Processing Systems
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• 제9권3호
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• pp.435-460
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• 2013

Recommender systems are popular applications that help users to identify items that they could be interested in. A recent research area on recommender systems focuses on detecting several kinds of inconsistencies associated with the user preferences. However, the majority of previous works in this direction just process anomalies that are intentionally introduced by users. In contrast, this paper is centered on finding the way to remove non-malicious anomalies, specifically in collaborative filtering systems. A review of the state-of-the-art in this field shows that no previous work has been carried out for recommendation systems and general data mining scenarios, to exactly perform this preprocessing task. More specifically, in this paper we propose a method that is based on the extraction of knowledge from the dataset in the form of rating regularities (similar to frequent patterns), and their use in order to remove anomalous preferences provided by users. Experiments show that the application of the procedure as a preprocessing step improves the performance of a data-mining task associated with the recommendation and also effectively detects the anomalous preferences.

• 정신신체의학
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• 제5권1호
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• pp.52-62
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• 1997

This study was designed to determine the frequency of premenstrual dysphoric disorder in gynecological outpatients, and also attempted to compare premenstrual change characteristics, functional impairment due to premenstrual changes and frequency of risk factors reported by women with confirmed premenstrual changes$(PMC^+)$(n=17) and those without confirmed premenstrual changes$(PMC^-)$(n=23). Forty gynecological outpatients who complained of premenstrual discomforts were asked to complete questionnaires on menstrual history, obstetric-gynecological history, and premenstrual change and functional impairment. The women were also asked to complete a daily rating form based on DSM-IV diagnostic criteria for one menstrual cycle. Absolute severity method, effect size method and percent change method were used to assess changes between follicular phase and luteal phase. The results of the study were as follows: 1) The frequency of premenstrual dysphoric disorder according to each of the three methods was 5% for the absolute severity method, 15% for the effect size method, and 27.5% for the percent change method. 2) The frequently reported symptoms were as follow: physical symptoms(64.7%) : lethargy, easy fatigability, or marked lack of energy(41.2%) : decreased interest in usual activities(29.4%) ; and marked affective lability(23.5%). 3) There were no significant differences in onset ages of premenstrual changes, regularities of premenstrual changes and changes of severity and duration of premenstrual symptoms over time between women with and without confirmed premenstrual changes. However, women with confirmed premenstrual changes reported both physical and emotional symptoms as earliest symptoms most frequently, while women without confirmed premenstrual changes reported only physical symptoms most frequently. 4) functional impairment was significantly higher in women with confirmed premenstrual changes than those without confirmed premenstrual changes, but impairment was not severe. 5) No differences were found between women with and without confirmed premenstrual changes in risk factors including demographic data, menstrual and obstetric and gynecological history. These results suggest that the prevalence of premenstrual dysphoric disorder varies with scoring methods. The women with confirmed premenstrual changes reported physical symptoms most frequently(64.7%). functional impairment was significantly higher in women with confirmed premenstrual changes, but impairment was not severe.

• 정신신체의학
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• 제7권1호
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• pp.61-71
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• 1999

연구목적 : 본 연구는 월경전기변화와 스트레스의 상호관계를 알기 위해 전향적 평가 방법을 이용하여 월경전기 변화가 확인된 군(n=32)과 확인되지 않은 군(n=62) 간에서 황체기와 난포기간의 스트레스의 지각 정도를 비교 연구하였다. 방법 : 30세 이상의 건강한 성인여성 94명을 대상으로 월경전기 동안의 심리적, 신체적 변화를 평가 하기 위해 DSM-IV에 제시되어 있는 월경전불쾌기분장애(PMDD) 의 진단기준 A의 11개 항목에 기초한 매일 평가서(Daily Rating Form)를 한 번의 월경주기 동안 매일 작성하고, 스트레스 지각 정도를 평가하기 위해 5점 likert 척도를 이용해 매일 평가하도록 했다. 결과 : 1) 월경전기변화가 확인된 군은 32명이었고 확인되지 않은 군은 62명으로 두 군간에 인구 통계학적 변인(연령, 교육 정도, 결혼, 직업 등) 및 월경전기변화의 위험 요소(초경 연령, 월경전기변화의 규칙성, 월경 기간, 월경량, 월경 주기, 월경통 등)에 차이는 없었다. 2) 월경전기변화가 확인된 군의 평균 황체기 스트레스 점수($1.92\pm0.63$) 와 확인되지 않은 군의 평균 황체가 스트레스 접수($1.5\pm0.42$)에는 유의한 차이가 있었으나(p<0.05) 두 집단간에 평균 난포기 스트레스 점수에는 유의한 차이가 없었다. 3) 중년 여성에서 월경전기변화가 확인된 군을 스트레스가 높은 집단과 낮은 집단으로 나누었을 때 스트레스가 높은 집단이 낮은 집단에 비해 황체기 심리 증상을 더 많이 보고 하였으나(F=13.362, df=1, p<0.001) 신체 증상에는 차이를 보이지 않았다. 결론 : 본 연구의 결과는 중년 여성에서 월경전기변화가 확인된 군에서는 황체기 동안 스트레스 점수가 높게 나타났으며 스트레스의 지각 정도는 심리 증상과는 관련이 있으나 신체 증상과는 관련이 없는 것으로 나타났다. 따라서 향후 월경전기증후군의 치료 전략으로 특히 섬리 증상의 치료를 중심으로 한 스트레스의 관리가 중요할 것이다.