• 한국경영과학회지
• /
• 제33권4호
• /
• pp.1-12
• /
• 2008

The study suggests an answer to the question of what determines category diversification of Internet portals in Korea. First, as external factors, competition intensity and market growth are hypothesized to have influence on the degree of category diversification. Second, an internal factor, user loyalty to portals, is hypothesized to influence negatively category diversification. The study performed empirical analysis based on weekly portal-specific panel data of eighteen internet portals in Korea during the period between 2001 and 2004. The result shows that category diversification increases as competition intensity increases, and that category diversification decreases as user loyalty increases. There was no effect of market-level growth rate on category diversification.

• 한국컴퓨터정보학회논문지
• /
• 제23권11호
• /
• pp.219-228
• /
• 2018

This study conducted to identify the impact of organizational factors on the characteristics of category management system, market orientation and collaboration orientation, in domestic retail industry, and also to identify the relationship between organizational factors and category management system's characteristics varies depending on the business type, retailer and supplier. To accomplish these research purposes, the study performed statistical analyses using a total of 94 samples. The results of the study can be summarized as follows. First, the organizational factors that affect market orientation of the category management system were found to be information technology infrastructure and organizational management system, and the organizational factors that affect collaborative orientation of the category management system were found to be partnerships and organizational management systems. Second, the relationship between market orientation and collaborative orientation of the category management system does not differ by the business type.

• Korean Journal of Mathematics
• /
• 제17권2호
• /
• pp.161-167
• /
• 2009

Category Fuz of fuzzy sets has a similar function to the Category Set. We study injective, absolute retract, enough injectives, injective hulls and essential extension in the Category Fuz of fuzzy sets.

• The International Journal of Costume Culture
• /
• 제2권1호
• /
• pp.31-42
• /
• 1999

The category killer that has been rapidly growing mainly in advanced countries since early 1990's, is a mew distribution model which aims for obtaining market controlling power by surpassing competing businesses in a specific area of products. The domestic situation of category killers is very different from that of advanced ones abroad since it has just been introduced into the Korean market. At the moment, there are only 10 or so companies operating in the market : Geopyung's , Taeheng's , Midopa's , of Sinsegye Department store, adn of Yerim International. The purpose of this study is to examine problems of domestic companies in the present market by analysing the operation status of category killers in domestic markets as well as foreign ones, and to suggest a counter-strategy of category killers for the distribution environment of the 21st century to improve the competitiveness of Korean distribution industry. The competitiveness of category killers lies above all in products lines. Category killers are equipped with the greatest number of products lines among those of competing businesses due to maximized product selections in an limited range. Another source of competitiveness may be found in balanced strategy positioning. That is to say, category killers are in a position where they can adjust policies towards any of the three purposes while aiming at them altogether : prices of discount stores, products range of specialty stores, and customer service level of department stores. It is also necessary for efficient store operation to use information technology such as electronic data interchange (EDI), electronic pose system(EPOS) and electronic funds transfer (EFTPOS). As for the cost structure, category killers can gain an advantage over other business since operating cost of various sections can be saved. There are, however, certain risks that category killers with strong competitiveness may influence on other businesses a great deal and even facilitate their decline. Yet it seems that the growth of category killers will be more viciously restrained by continuous challenges from other businesses. The distribution industry is supposed to develop through such competition and restraint.

• 로봇학회논문지
• /
• 제4권3호
• /
• pp.185-191
• /
• 2009

This paper presents a new shape-based algorithm using affine category shape model for object category recognition and model learning. Affine category shape model is a graph of interconnected nodes whose geometric interactions are modeled using pairwise potentials. In its learning phase, it can efficiently handle large pose variations of objects in training images by estimating 2-D homography transformation between the model and the training images. Since the pairwise potentials are defined on only relative geometric relationship betweenfeatures, the proposed matching algorithm is translation and in-plane rotation invariant and robust to affine transformation. We apply spectral matching algorithm to find feature correspondences, which are then used as initial correspondences for RANSAC algorithm. The 2-D homography transformation and the inlier correspondences which are consistent with this estimate can be efficiently estimated through RANSAC, and new correspondences also can be detected by using the estimated 2-D homography transformation. Experimental results on object category database show that the proposed algorithm is robust to pose variation of objects and provides good recognition performance.

• 대한방사선기술학회지:방사선기술과학
• /
• 제43권5호
• /
• pp.367-374
• /
• 2020

The purpose of this study is to understand the infection prevention system and infection management perception of Ultrasound diagnostic room in medical institutions by sonographer's in general practitioner, semi and general hospitals. As a research method, a statistical analysis was conducted by surveying a total of 20 items in four category to determine the infection perception of sonographer's according to gender, age, working institution, and working period. As a result of infection awareness, males were in the ultrasound gel management category, women were in the transducer management category, all age groups were in the transducer management system category, and the General Practitioner, semi and general hospitals. were in the transducer management system category, and general hospitals showed a high degree of infection awareness in the category of disinfection and sterilization, and in the category of transducer management in the entire working period. In the results of the analysis of the correlation between the sub-factors of the perception of infection control in the Ultrasound diagnostic room the degree of correlation between each category showed a middle degree correlation(r>0.5) and a significant difference by category(p<.01). In conclusion, the prevention of infection in the ultrasound diagnostic room, which sonographer's firms think, was found to be the most efficient ultrasound diagnostic room infection control to implement transducer and gel management in accordance with the principles of disinfection and sterilization.

• 한국멀티미디어학회논문지
• /
• 제21권12호
• /
• pp.1417-1424
• /
• 2018

In order to improve the performance of image classifications using Convolutional Neural Networks (CNN), applying a category hierarchy to the classification can be a useful idea. However, the visual separation of object categories is very different according to the upper and lower category levels and highly uneven in image classifications. Therefore, it is doubtable whether the use of category hierarchies for classification is effective in CNN. In this paper, we have clarified whether the image classification using category hierarchies improves classification performance, and found at which level of hierarchy classification is more effective. For experiments we divided the image classification task according to the upper and lower category levels and assigned image data to each CNN model. We identified and compared the results of three classification models and analyzed them. Through the experiments, we could confirm that classification effectiveness was not improved by reduction of number of categories in a classification model. And we found that only with the re-training method in the last network layer, the performance of lower category classification was not improved although that of higher category classification was improved.

• 인지과학
• /
• 제25권3호
• /
• pp.233-257
• /
• 2014

범주기반 귀납추론은 인간이 사용하는 주요한 추론방법중 하나이다. 본 연구는 지각된 범주내 변산성이 범주기반 귀납적 일반화에 미치는 효과를 검증하기 위해 실시되었다. 실험 1에서는 범주 예시를 직접 제시하여 범주 변산성 지각을 조작하였다. 조건에 따라 범주내 변산성이 낮은 예시들 (낮은 변산 조건) 혹은 높은 예시들 (높은 변산 조건)을 범주의 예로 제시한 후, 해당 범주에 대한 귀납적 일반화 과제를 실시하였다. 그 결과 지각된 범주 변산성이 낮은 조건이 지각된 변산성이 높은 조건보다 귀납적 일반화에 대한 확신이 더 높다는 것을 확인하였다. 실험 2에서는 범주의 예시를 직접 제시하지 않고, 다양한 예시들 중 특정 범주에 속하는 예들을 참가자들이 변별하는 범주화 과제를 실시함으로써 범주 변산성을 지각하도록 한 후, 귀납추론 과제를 실시하였다. 그 결과, 실험 1과 마찬가지로 지각된 범주 변산성이 낮은 조건이 높은 조건보다 귀납적 일반화에 대한 확신이 더 강해지는 경향을 확인할 수 있었다. 본 연구의 결과는 기존 연구에서 보여준 다양성 효과와 차이점을 보이며 또한 Osherson과 동료들 (1990)이 제안한 귀납추론 모형으로는 설명하기 어렵다. 종합논의에서 범주기반 귀납추론에서 지각된 변산성 효과의 검증에 대해 간략히 논의하였다.

• 보건의료산업학회지
• /
• 제5권2호
• /
• pp.77-89
• /
• 2011

This study conducted a secondary analysis by using original data of performed by Korea Institute for Health and Social Affairs to know factors affecting determinants of health using Lalonde model for the adults aged over 19 years living in Korea. The survey was conducted in 2009 and it evaluated finally 5,867 cases by excluding cases with no answer or a wrong answer. This study model adopted two categories of instrument measure health were objective (Average remaining lifetime) and subjective(EQ-5D) health status. The health determinants included in this study could be divided in to four categories, which were human biology, environment, lifestyle, and health care organization. The results were as follows. In the factors affecting average remaining lifetime, human biology were sex, ages, BMI, showed statistically significant difference, environment category were merry status, education showed statistically significant difference, lifestyle category were exercise, drunks showed statistically significant difference and health care organization category were vaccination, health screening showed statistically significant difference. In the factors affecting EQ-5D, human biology category and health care organization category showed with same average remaining lifetime, environment category were merry status, education, income showed statistically significant difference and lifestyle category were exercise, drunks, stress showed statistically significant difference. The results demonstrated that the best powerful factor was life style category and environment category, the least factor was health care organization category. So lifestyle style and environment category should be considered for the future health plan, budget allocation and the priority in the health care.

• 대한수학회지
• /
• 제37권3호
• /
• pp.491-502
• /
• 2000

The disjoint union of mapping class groups g,1 gives us a braided monoidal category so that it gives rise to a double loop space structure. We show that there exists a natural twist in this category, so it gives us a ribbon category. We show that there exists a natural twist in this category, so it gives us a ribbon category. We explicitly express this structure by showing how the twist acts on the fundamental group of the surface Sg,l. We also make an explicit description of this structure in terms of the standard Dehn twists, as well as in terms of Wajnryb's Dehn twists. We show that the inverse of the twist g for the genus g equals the Dehn twist along the fixed boundary of the surface Sg,l.