• 호남수학학술지
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• 제25권1호
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• pp.117-127
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• 2003

In this note we perform an extreme point analysis on two natural definitions of negative quadrant dependence of three random variables and examine how different these two notions of dependence. We also characterize some special distributions which are both negatively lower orthant dependent and negatively upper orthant dependent.

• 농촌계획
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• 제26권2호
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• pp.1-12
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• 2020

This study aimed to define characteristics of mountain village landscapes perceived by locals to sustainably preserve and manage mountain village landscapes. We selected landscape resources of mountain villages by reviewing previous studies and conducting field surveys and surveyed mountain villages' locals to investigate the characteristics of their perceptions of the mountain village landscapes. The surveys were conducted from March to October 2019, in the form of 1:1 questionnaire survey. In consequence, highly reliable 150 responses were analyzed. IPA method(Revised Importance-Performance Analysis) was used in the analysis. It is found that, in landscapes, the first quadrant is 'Cultivated land, Forest', the second quadrant is 'Coastal, Forestry and Agriculture Facility', the third quadrant is 'Forest Service·Profitable Facility, Settlement, History and Culture', and the fourth quadrant is 'Riparian, Street'. In conclusion, locals of mountain villages are perceiving the mountain village landscapes based on their livelihoods and daily lives, and the mountain village landscapes are closely related to their lives. The results of this study are expected to be utilized as fundamental resources in establishing policies regarding sustainable conservation and management of mountain village landscapes which led by locals.

• Nuclear Engineering and Technology
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• 제53권6호
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• pp.1947-1954
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• 2021

In the nuclear medicine imaging, quality control (QC) process using quadrant bar phantom is fundamental aspect of evaluating the spatial resolution. In addition, QC process of gamma camera is performed by daily or weekly. Recently, Monte Carlo simulation using the Geant4 application for tomographic emission (GATE) is widely applied in the pre-clinical nuclear medicine field for modeling gamma cameras with pixelated cadmium telluride (CdTe) semiconductor detector. In this study, we modeled a pixelated CdTe semiconductor detector and quadrant bar phantom (0.5, 1.0, 1.5, and 2.0 mm bar thicknesses) using the GATE tool. Similarity analysis based on correlation coefficients and peak signal-to-noise ratios was performed to compare image qualities for various source to collimator distances (0, 2, 4, 6, and 8 cm) and collimator lengths (0.2, 0.4, 0.6, 0.8, and 1.0 cm). To this end, we selected reference images based on collimator length and source to collimator distance settings. The results demonstrate that as the collimator length increases and the source to collimator distance decreases, the similarity to reference images improves. Therefore, our simulation results represent valuable information for the modeling of CdTe-based semiconductor gamma imaging systems and QC phantoms in the field of nuclear medicine.

• 대한지역사회영양학회지
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• 제13권4호
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• pp.510-519
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• 2008

This study was conducted to develop and evaluate nutrition education media for breast cancer. The booklet was developed and consisted of breast cancer and diet, breast cancer and nutrition, breast cancer and food safety and Ingredients and recipes for breast cancer. The questionnaire requested information related to demographics, importance and satisfaction of evaluation for nutrition education media, evaluation of each chapter, and satisfaction of educational media. The data were analyzed using SPSS for Windows(version 12.0). The results were summarized as follows. The importance score for nutrition education media was higher than the satisfaction score. As a result of IPA analysis, quadrant I included 'comprehension', 'appropriateness of media', 'emphasis of the point'. Quadrant II classified with 'appropriateness of terms', 'interest', 'authenticity', 'appropriateness of illustrations'. Quadrant III included 'appropriateness of color and calligraphy', 'simplicity'. Quadrant IV classified with 'appropriateness of examples', 'concreteness'.

• 한국콘텐츠학회논문지
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• 제14권1호
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• pp.466-477
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• 2014

본 연구는 방한 관광객을 대상으로 항공사 선택속성에 대한 중요도 및 성취도를 분석해 보고자 하였다. 이에 방한 일본인과 중국인을 대상으로 자료를 수집하여 대응표본 T-test를 실시하였으며 유의한 차이가 있는 속성과 각 선택 속성들 간의 순위를 살펴보았다. 또한 요인분석을 통하여 운송 서비스, 부대 서비스, 기내 서비스, 기본 서비스의 4가지 요인을 도출하였으며, IPA(Importance-Performance Analysis)기법을 이용하여 집중 영역, 유지 영역, 저순위 영역, 과잉노력 지양 영역의 항목들을 도출하였다. 항공사 선택속성에 대한 IP분석 결과 가장 노력하고 집중해야 할 I사분면, 집중영역은 의사소통의 편리함, 기내 승무원 친절도, 선호좌석 배정 등으로 나타났다. II사분면 유지영역은 중요도와 성취도가 모두 높은 영역으로 항공편 스케줄, 정확한 수하물 처리, 상용고객 우대제도, 탑승 라운지, 제휴서비스, 항공사 이미지, 기내방송 등으로 나타났다. III사분면 저순위 영역은 중요도와 성취도 모두 낮은 영역으로 노선 다양성, 승무원 유니폼, 항공 요금, 기내식 맛과 질 등으로 나타났다. IV사분면 과잉노력 지양 영역으로 중요도는 낮으나 성취도가 높은 영역으로 이에 해당하는 속성은 신속한 탑승수속, 좌석의 편안함, 항공기 기종과 연식으로 나타났다.

• 정보관리학회지
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• 제28권3호
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• pp.295-312
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• 2011

본 연구는 지적구조분석의 동시단어분석(co-word Analysis)방법을 '기업가정신'의 연구에 접목하여 지난 50여 년 간의 '기업가정신'과 관련한 국내 연구를 단계별로 분석하였다. 동시단어분석 방법은 연구주제 간의 정보를 시각화하고 이차원 평면에 주제들을 배치하여 연구의 전체적인 동향과 향후 연구 주제를 분석하는 정량적 분석방법으로, 연구 결과 크게 4가지 단계의 연구 경로의 방향성이 도출되었다. 분석에 따르면, 태동기 연구단계(3사분면)에서 연구가 시작되고, 독자적 연구단계(2사분면)의 연구 주제는 연구로서의 독자적인 분야로 정착되는 단계이며, 시대적 상황을 반영하는 연구의 주제들이 포함되어 있다. 성장기 연구단계(1사분면)는 연구주제에 가장 밀접한 관계에 있는 연구주제들이 배치되어 있으며, 성숙기(4사분면)의 연구주제들이 연구의 중심에 위치하는 것을 알 수 있었다.

• 구강회복응용과학지
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• 제26권2호
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• pp.89-95
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• 2010

본 연구는 앞서 발표된 '교합이 악구강계 및 전신에 미치는 영향 (I), (II)'에서 연결되는 세 번째 논문으로 교합과 악구강계 및 전신 증상과의 관계를 다루고 있는 다섯 가지 주요 이론 중 두 가지인 Chirodontics, Dental Distress Syndrome and Quadrant Theorem에 관한 내용이다. 앞서 발표되었던 논문과 비슷한 방식으로 각각의 이론에 대한 역사적 배경과 정의, 기본 개념과 치료방법 및 그 한계에 대하여 보고하고자 한다.

• 한국항공운항학회지
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• 제21권4호
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• pp.112-118
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• 2013

Air travel demand has recently been growing and establishment and operation of low-cost carriers have been increased. Against this backdrop, low-cost carriers need to figure out diversified customer demand for low-cost carriers and ways to maximize marketing efficiency before applying it to the field so that they can attain superiority to large carriers in increased intensified competition. Low-cost carriers need to be differentiated from other carriers for the purpose of improving profits. Toward this end, this study conducted analysis on importance and satisfaction with carrier choice using IPA with regard to low-cost carrier customers. In conclusion, the paper accurately examined advantages and disadvantages of low-cost carriers compared to general carriers based on results of IPA analysis and suggested managerial strategies to enhance competitiveness based on division into four parts including maintenance and enforcement (1st quadrant, Delay compensation, Booking rapidity, Check rapidity, Crew service, refund service, baggage service, punctuality, transit services, airlines images), concentrated improvement (2nd quadrant, price, Convenience of seat), passive administration (3rd quadrant, Boarding service, cabin cleanliness, flight schedule, whether local crew on board, meal service, in-flight entertainment service), and enhanced satisfaction (4th quadrant, duty-free service, Variety of routes), so that practical suggestions could be presented to employees working in the field.

• 대한통합의학회지
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• 제9권1호
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• pp.69-90
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• 2021

Purpose : This study explores unmet medical services within a region for patients admitted to a single medical institution in one region and was to analyze the importance and satisfaction of hospital selection attributes. Through this, we tried to solve the unmet medical needs of patients and provide useful basic data in terms of hospital management in the region. Methods : It were collected to a total of 250 questionnaires for patients admitted to the regional integrative medical hospital. However, 232 samples were used for the final analysis, excluding 18 copies not reported in good faith. For the analysis, first, demographic frequency analysis of inpatients and inpatients was performed, and second, characteristics of patients, including frequent disease receiving treatment, were analyzed. Next, descriptive statistics analysis was conducted on unmet medical service intentions. In terms of hospital selection attribute, the items of continuity maintenance (I quadrant), priority visibility (II quadrant), low priority (III quadrant), and excessive effort (IV quadrant) were derived using the IPA (importance-performance analysis) matrix technique. Results : The derived results were classified by item and area. In the priority administration area, it was the reputation and recognition of medical institutions and the service area of medical institutions. In the case of items, there were 6 items including the importance of surgery and medical expenses, and diet at hospitalization. 1) Conclusion : Thus a result of this study, resources are efficiently allocated to priority correction areas with high importance but low satisfaction and circulatory medical treatment is performed in the departments required by patients who use medical care and, various methods, such as preparing a policy to support medical expenses, should be sought.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 춘계학술대회논문집A
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• pp.609-615
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• 2001

This study proposes analysis and evaluation method of time series ultrasonic signal using attractor analysis for fusion joint part of polyethylene piping. Quantitatively characteristics of fusion joint part is analysed features extracted from time series. Trajectory changes in the attractor indicated a substantial difference in fractal characteristics. These differences in characteristics of fusion joint part enables the evaluation of unique characteristics of fusion joint part. In quantitative fractal feature extraction, feature values of 4.291 in the case of debonding and 3.694 in the case of bonding were proposed on the basis of fractal dimensions. In quantitative quadrant feature extraction, 1,306 point in the case of bonding(one quadrant) and 1,209 point(one quadrant) in the case of debonding were proposed on the basis of fractal dimensions. Proposed attractor feature extraction can be used for integrity evaluation of polyethylene piping material which is in case of bonding or debonding.