• 한국전자거래학회지
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• 제21권2호
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• pp.1-22
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• 2016

최근 온라인 뉴스 포탈의 뉴스 추천 메커니즘이 뉴스 콘텐츠를 수집, 선택, 편집 및 왜곡하는 일이 일어나고 있다. 선행연구들은 뉴스의 가치에 대한 일관된 정의를 내리지도, 뉴스의 가치가 독자의 반응에 어떤 영향을 미치는지 실증적으로 검증하지도 못했다. 본 연구는 선행연구의 뉴스 가치 개념을 종합하고, 뉴스 가치를 아우를 수 있는 개념으로 대표성의 개념을 도입하였으며, 대표성 기반 정보발견법 및 정보 수용 모델을 활용하여, 대표성이 인지된 뉴스 품질, 신뢰, 인지된 유용성, 서비스 만족도, 충성도, 지속사용의도, 구전의도 등 독자 반응에 어떠한 영향을 미치는 지를 실증적으로 검증하였다. 시나리오 설문 법을 통해 총 357개의 유효한 자료가 수집되었다. 각 집단들은 1) 시간 순서기반 뉴스 추천 메커니즘, 2) 조회수 기반 뉴스 추천 메커니즘, 3) 편집자에 의해 선택된 주요 뉴스를 다시 조회수 기반으로 정렬한 뉴스 추천 메커니즘의 세 종류의 메커니즘에 각각 노출되었다. MANOVA 분석결과에 따르면, 편집자에 의해 선택된 주요 뉴스를 다시 조회수 기반으로 정렬한 뉴스 추천 메커니즘만이 여타 집단에 비해 인지된 뉴스 품질과 신뢰에서 유의한 차이를 보였다. PLS 분석 결과에 따르면, 이렇게 형성된 인지된 뉴스 품질과 신뢰는 인지된 유용성, 서비스 만족도, 충성도, 지속사용의도, 구전의도 등 독자 반응을 유의하게 증가시키는 것으로 조사되었다. 본 연구의 학술적 기여는 언론 영역에서 정보기술의 역할을 강조하고, 편집자와 독자 모두가 인정하는 뉴스가 가치 있는 뉴스라고 개념화 하였으며, 뉴스 추천 메커니즘의 효과를 실증한 가치를 가진다. 실무적 측면에서 본 연구는 온라인 뉴스 포탈이 편집자와 독자의 시각이 모두 반영된 절충안의 뉴스 추천 메커니즘을 활용하는 것이 독자를 유인하기 위해 도움이 될 것이라고 제안한다.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2005년도 춘계 학술대회
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• pp.151-157
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• 2005

한국원자력연구소에서는 토양폐기물의 규제해제를 통한 처리를 위하여 토양의 핵종 및 방사능분석에 대한 절차를 개발하고 있다. 토양의 규제해제를 위한 기반작업으로 대표성 있는 시료를 추출하기 위하여 균질화, 평균화를 거쳐 임의추출(random sample)하는 시료추출의 방법론을 결정하였다. 통계학적인 관점에서의 대표성은 시료추출의 방법론 뿐 만 아니라 시료의 크기를 얼마로 할 것인가에 대한 설계가 선행 되어야 한다. 본 연구에서는 토양폐기물에서 시료를 채취하는 절차에 따라 예비시료를 추출한 후 핵종 및 방사능평가 작업을 수행한 결과를 사용하여 신뢰구간과 오차 한계에 따른 시료의 개수를 산정하였다.

• 한국수학교육학회지시리즈A:수학교육
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• 제57권4호
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• pp.413-431
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• 2018

In this study, I developed an activity oriented lesson to support the understanding of probabilistic and quantitative estimating population ratios according to the standard statistical principles and discussed its implications in didactical respects. The developed activity lesson, as an efficient physical simulation activity by sampling with replacement, simulates unknown populations and real problem situations through completely closed 'Closed Box' in which we can not see nor take out the inside balls, and provides teaching and learning devices which highlight the representativeness of sample ratios and the sampling variability. I applied this activity lesson to the gifted students who did not learn estimating population ratios and collected the research data such as the activity sheets and recording and transcribing data of students' presenting, and analyzed them by Qualitative Content Analysis. As a result of an application, this activity lesson was effective in recognizing and reflecting on the representativeness of sample ratios and recognizing the random sampling variability. On the other hand, in order to show the sampling variability clearer, I discussed appropriately increasing the total number of the inside balls put in 'Closed Box' and the active involvement of the teachers to make students pay attention to controlling possible selection bias in sampling processes.

• The Journal of Asian Finance, Economics and Business
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• 제8권3호
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• pp.1231-1240
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• 2021

A shift in perspective from standard finance to behavioral finance has taken place in the past two decades that explains how cognition and emotions are associated with financial decision making. This study aims to investigate the influence of various psychological factors on investment decision-making. The psychological factors that are investigated are differentiated into two aspects, cognitive and emotional aspects. From the cognitive aspect, we examine the influence of anchoring, representativeness, loss aversion, overconfidence, and optimism biases on investor decisions. Meanwhile, from the emotional aspect, the influence of herding behavior on investment decisions is analyzed. A quantitative approach is used based on a survey method and a snowball sampling that result in 165 questionnaires from individual investors in Yogyakarta. Further, we use the One-Sample t-test in testing all hypotheses. The research findings show that all of the variables, anchoring bias, representativeness bias, loss aversion bias, overconfidence bias, optimism bias, and herding behavior have a significant effect on investment decisions. This result emphasizes the influence of behavioral factors on investor's decisions. It contributes to the existing literature in understanding the dynamics of investor's behaviors and enhance the ability of investors in making more informed decision by reducing all potential biases.

• 한국유기농업학회지
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• 제32권1호
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• pp.25-37
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• 2024

This study is to apply behavioral economics-an economics that studies actual human behavior based on cognitive psychology-to the farming decision-making process of onion and garlic farmers. Of behavioral economic theories, dual system theory and prospect theory (value function), heuristic and bias were surveyed and examined in the field. The reference point of farmers was farming experience of the previous year, and so they showed reference dependence and anchoring heuristic, not rational thinking on production cost plan. And they showed status quo bias that cultivated continuously the previous year or the present crop. This status quo bias is related to loss aversion propensity. Farmers did not usually change cultivating crops, in other words, they showed diminishing sensitivity-insensitive to those that the more revenue or loss was increased. This diminishing sensitivity is related to loss aversion propensity and status quo bias. Also, farmers had representativeness heuristic because they regarded auction price of Garakdong wholesale market as the standard price level despite various prices by production region. And farmers had the affect heuristic that they depended on producers' organization data more than the state-run research institute ones about cultivation intentions and actual situations.

• 환경영향평가
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• 제24권6호
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• pp.607-618
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• 2015

국가환경시료은행에서는 과거 환경 재현을 목적으로 다양한 생태계를 대표하는 시료를 채취 저장하고 있다. 지난 5년간 8종의 생태계 시료종이 엄격한 표준운영절차(SOP)에 따라 채취되어 왔으나 수행절차에 대한 비용효율성이나 시료의 대표성에 대한 논리적 통계적 검증은 이루어 진 바 없었다. 따라서 본 연구에서는 시료채취 및 분석과정으로 구성된 표준운영절차의 각 단계에서 비롯되는 불확도(uncertainty) 수준에 대한 평가를 실시하였다. 이를 위해 표준운영절차에서 규정된 채취방법에 의해 채취된 두 지역의 침엽수 시료를 대상으로 중복시료(duplicate sample)를 채취하였고, 이에 대한 중복분석결과를 대칭설계(balanced design)하여 분산분석을 실시하였다. 시료채취 및 분석의 각 단계에서 산출된 불확도 수준은 각 해당지역 대표시료에 대한 측정불확도로 통합되었다. 그 결과 시료채취단계와 분석단계 중 측정불확도의 대부분은 시료채취단계에서 비롯되고 있음이 확인되었다. 또한 측정불확도 수준을 저감하기 위해서는 표준운영절차에서 규정하고 있는 시료채취방법이 개선되어야 하는데, 본 연구에서 확인된 채취지역의 상대적으로 큰 국지적 이질성(small-scale heterogeneity)으로 말미암아 지역내에서의 채취대상 개체수를 확대하는 것보다 각 개체에서 채취되는 시료량을 늘리는 것이 비용효율적인 개선에 대한 기준이 되었다. 또한 채취방법이 채취지역에서 분포하는 개체들의 이질성을 충분히 극복하며 대표성을 확보할 수 있는가에 대한 검증으로서 분산분석을 적용한 결과, 지역전체의 변화량보다 국지적 변화량이 더 커야 하는 조건을 제시할 수 있었다.

• Asian Pacific Journal of Cancer Prevention
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• 제17권7호
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• pp.3123-3129
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• 2016

Background: Cancer is the fourth leading cause of death in Sabah Malaysia with a reported age-standardized incidence rate was 104.9 per 100,000 in 2007. The incidence rate depends on non-mandatory notification in the registry. Under-reporting will provide the false picture of cancer control program effectiveness. The present study was to evaluate the performance of the cancer registry system in terms of representativeness, data quality, simplicity, acceptability and timeliness and provision of recommendations for improvement. Materials and Methods: The evaluation was conducted among key informants in the National Cancer Registry (NCR) and reporting facilities from Feb-May 2012 and was based on US CDC guidelines. Representativeness was assessed by matching cancer case in the Health Information System (HIS) and state pathology records with those in NCR. Data quality was measured through case finding and re-abstracting of medical records by independent auditors. The re-abstracting portion comprised 15 data items. Self-administered questionnaires were used to assess simplicity and acceptability. Timeliness was measured from date of diagnosis to date of notification received and data dissemination. Results: Of 4613 cancer cases reported in HIS, 83.3% were matched with cancer registry. In the state pathology centre, 99.8% was notified to registry. Duplication of notification was 3%. Data completeness calculated for 104 samples was 63.4%. Registrars perceived simplicity in coding diagnosis as moderate. Notification process was moderately acceptable. Median duration of interval 1 was 5.7 months. Conclusions: The performances of registry's attributes are fairly positive in terms of simplicity, case reporting sensitivity, and predictive value positive. It is moderately acceptable, data completeness and inflexible. The usefulness of registry is the area of concern to achieve registry objectives. Timeliness of reporting is within international standard, whereas timeliness to data dissemination was longer up to 4 years. Integration between existing HIS and national registration department will improve data quality.

• 한국조경학회지
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• 제35권6호
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• pp.84-96
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• 2008

This research investigated the landscape characteristics of the skyline and the cognitive characteristics of Mt. Mudeung (1,186m) from various viewpoints. Mt. Mudeung, the representative landscape of Gwangju City, has been recognized as a natural landmark and theme of paintings. By analyzing the perspective from 32 points with a digital terrain model, some landscape indices of the skyline were derived and the relationships are discussed. Assessment of the semantic differential scale with 21 adjective variables and representativeness to 15 landscape photographs of the mountain were accomplished. 1. Through regression analysis of the skyline indices, significant relationships were found between them the angle from the visual axis and number of skyline jumps, the vertical angle fluctuation and number of jumps per degree, the visual depth fluctuation and vertical angle fluctuation of skyline, and between the vertical angle mean and number of jumps per degree. Meaningful relations were found between the number of jumps of skyline to number of jumps per degree and the angle from visual axis to visual distance. However, in the representative assessment no difference was found on the angle from visual axis of viewpoints. On the other hand, it seemed to relate representativeness with visual clarity based on visual distance. 2. We found 4 factors "familiarity", "fluctuation of skylines", "openness", and "feeling of texture" in the results of factor analysis of semantic differential assessment. When considering the results of assessment for representativeness, adjective words for familiarity and openness seemed to have a close assessment. Specifically, the research showed that the landscape representation was highly assessed in a view which could be seen from the higher parts to the lower part of hills. This result indicates that the management of viewpoints which could get a scene from intermediate to distant, and locating a high elevation is important. 3. In the picturesque expression of Mt. Mudeung, various impressions from the different points, a skyline based on the top of Mt. Mudeung and a mono structure by overlapping hills were common characteristics. These common characteristics were also partially found through the analysis of topographical landscape indices and landscape images. Therefore, the viewpoints for the representative landscape management should be selected in natural or open spaces.

• 한국조경학회지
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• 제35권4호
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• pp.90-104
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• 2007

Landmarks like high-rise building are one of the important elements for the enhancement of city identity and provides the hierarchy of city streets, playing a central and symbolic role in cities. Research on physical attribute of landmarks, such as height, distance, location and shape, which are suitable for a city scale, can help a city create a distinct image and maintain comprehensible structure. To achieve this purpose, it is necessary to understand the spatial and cognitive characteristics of a landmark for the establishment and management of it. The results of this study can be summarized as follows: 1. The level of representativeness of a landmark increases in proportion to the degree of cognitive intensity on it. The relation between representativeness and cognitive intensity can be explained as the log-function as follows: Log(the number of people who respond "It has representativeness")=$-1.2579+1.5908{\times}$(cognitive intensity); 2. There are a few differences based on the attributes of respondents: while gender has no distinct influence, residential period and age show statistically meaningful influence on cognitive intensity of a vertical landmark Cognitive intensity of an individual landmarks especially, differs according to the class of main users. Because of frequent changes in occupation or employment, respondents consider the distance from a residential area more important than the distance from a working area in evaluating cognitive intensity of landmarks; 3. landmark can be classified into two kinds: a district landmark and an urban landmark A district landmark is closely connected with physical attributes of the landmark itself, such as distance, size and height. An urban landmark is mainly related to cognitive attributes such as the image and identity of a city as a whole. As a result, the landmark analysis data in this research provides spatial order and identity in a city. It is difficult to establish and reinforce the image of a city as a single element ike a landmark. However, withy steady follow-up research, this study could be seen as a systematic and logical model to improve urban landscape and image.

• 대한예방의학회:학술대회논문집
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• 대한예방의학회 2004년도 제56차 추계 학술대회 연제집
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• pp.37-38
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• 2004