• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.195-197
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• 2022

일반적으로 게임에서는 유저의 과금이나 광고 시청 등으로 수익을 내기 때문에 게임을 플레이 하는 유저의 수는 곧 그 게임의 수익으로 이어진다. 그러므로 신규 유저의 유입뿐만 아니라 기존 유저의 이탈을 막는 것 또한 매우 중요하다. 유저의 이탈은 짧은 기간 동안 게임을 플레이 한 유저인지 아니면 매우 오래 플레이하고 과금까지 하던 충성고객인지를 가리지 않고 일어난다. 본 논문은 설문을 통해 온라인과 모바일 게임에서 유저의 이탈 경험과 이탈 원인에 대해서 조사하고 이에 따른 유저의 이탈 예방과 개선 방안을 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2024.05a
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• pp.788-791
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• 2024

온라인 교육의 보급이 증가함에 따라 온라인 학습자의 중도이탈율을 줄이기 위한 효과적인 전략이 필요해 졌다. 본 논문은 인공지능 기술을 온라인 학습 분야에 적용하여 온라인 학습 중도 이탈 문제를 해결하고자 한다. 특히 온라인 교육기관에서 중도이탈예측 시스템을 이미 운영 중인 온라인교육시스템(LMS)을 새롭게 구축하거나 크게 변경하지 않고도 개발 또는 도입이 가능한 방안을 제시한다. 운영 중인 온라인교육시스템(LMS)에 저장되고 있는 온라인 학습자들의 학습자정보 및 학습 이력 데이터를 활용하여 중도 이탈 위험이 있는 학생을 식별하고 맞춤형 관리가 가능하도록 온라인 교육 중도 이탈예측 시스템 개발하고 LMS와 연동하여 서비스는 방법을 제안한다. 이를 통해 온라인교육기관에서는 중도이탈이 있는 학생을 효과적으로 관리함으로써 온라인 교육의 질을 향상시킬 수 있고, 더 많은 수의 온라인 학습자가 성공적으로 과정을 이수할 수 있도록 하는 데 기여할 것이다.

• Defense and Technology
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• no.7 s.137
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• pp.58-67
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• 1990

서방 공업강국중 하나인 이탈리아는 광범위한 방위산업을 유지하고 있다. 이탈리아 방위산업은 저변이 넓고 깊은 저력을 가지고 있다. 전자분야와 같은 특정분야 에서는 독점보다는 오히려 치열한 국내 경쟁이 전개되고 있다. 그러나 업계는 지난 3년간 어려운 시기를 겪었다. 정부의 새로운 수출법 제정에 따라 갈피를 잡을수 없는 동안 방산수출은 사실상 중단되었다. 동시에 시장은 거의 정체상태였다. 국제 프로그램의 참여가 이탈리아 업계의 돌파구가 될 것이며, 보다 장기적으로 볼때 이탈리아 업계의 활로는 유럽의 C-130 교체사업으로 부터 찾을수 있다.

• Aerospace Industry
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• s.106
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• pp.62-63
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• 2010

지난 2001년 미국 NASA가 국제우주정거장(ISS)의 거주구역 제작 계획을 포기했을 때 미국 NASA를 대신해 ISS의 거주구역의 제작을 담당한 것은 바로 이탈리아 우주청(ASI)였다. 비록 표면에는 드러나지 않지만 이탈리아는 우주개발 분야에서 독자적인 영역을 구축하고 있으며 유럽연합 내에서 프랑스, 독일에 이어 3번째로 많은 관련예산을 집행하고 있다. 이탈리아 우주개발의 중추적 역할을 담당하고 있는 이탈리아 우주청에 대해 알아본다.

• Tuberculosis and Respiratory Diseases
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• v.42 no.3
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• pp.361-369
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• 1995

Background: A number of different weaning techniques can be employed such as spontaneous breathing trial, Intermittent mandatory ventilation(IMV) or Pressure support ventilation(PSV). However, the conclusive data indicating the superiority of one technique over another have not been published. Usually, a conventional spontaneous breathing trial is undertaken by supplying humidified $O_2$ through T-shaped adaptor connected to endotracheal tube or tracheostomy tube. In Korea, T-tube trial is not popular because the high-flow oxygen system is not always available. Also, the timing of extubation is not conclusive and depends on clinical experiences. It is known that to withdraw the endotracheal tube after weaning is far better than to go through any period. The tube produces varying degrees of resistance depending on its internal diameter and the flow rates encountered. The purpose of present study is to evaluate the effectiveness of weaning and extubation following a 60 minutes spontaneous breathing trial with simple oxygen supply through the endotracheal tube. Methods: We analyzed the result of weaning and extubation following a 60 minutes spontaneous breathing trial with simple oxygen supply through the endotracheal tube in 18 subjects from June, 1993 to June, 1994. They consisted of 9 males and 9 females. The duration of mechanical ventilation was from 38 hours to 341 hours(mean: $105.9{\pm}83.4$ hours). In all cases, the cause of ventilator dependency should be identified and precipitating factors should be corrected. The weaning trial was done when the patient became alert and arterial $O_2$ tension was adequate($PaO_2$ > 55mmHg) with an inspired oxygen fraction of 40%. We conducted a careful physical examination when the patient was breathing spontaneously through the endotracheal tube. Failure of weaning trial was signaled by cyanosis, sweating, paradoxical respiration, intercostal recession. Weaning failure was defined as the need for mechanical ventilation within 48 hours. Results: In 19 weaning trials of 18 patients, successful weaning and extubation was possible in 16/19(84.2 %). During the trial of spontaneous breathing for 60 minutes through the endotracheal tube, the patients who could wean developed slight increase in respiratory rates but significant changes of arterial blood gas values were not noted. But, the patients who failed weaning trial showed the marked increase in respiratory rates without significant changes of arterial blood gas values. Conclusion: The result of present study indicates that weaning from mechanical ventilation following a 60 minutes spontaneous breathing with $O_2$ supply through the endotracheal tube is a simple and effective method. Extubation can be done at the same time of successful weaning except for endobronchial toilet or airway protection.

• Journal of Korean Library and Information Science Society
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• v.37 no.3
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• pp.325-356
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• 2006

This study deals with information poverty and information service for information welfare of North Korean refugees. On the basis of the data collected and analyzed, it was concluded that North Korean refugees were situated at information poverty, as compared to the situation of South Koreans. It was also found out that their information poverty was caused by the inferiority of their information literary and information environment. In conclusion, this study made some suggestions for overcoming the information poverty and promoting the information welfare of North Korean refugees.

• Journal of Digital Convergence
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• v.16 no.2
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• pp.37-45
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• 2018

The purpose of this study is to analyze the cognizance of North Korean refugee by applying Q methodology, as well as to provide preliminary data for improving North Korean refugee's image. The study process let P sample, the study participants, use Q-sorting methodology to sort Q sample, which is composed of statements. 18 participants sorted 32 statements and 3 types of North Korean refugee cognizance were produced as a result. Those types are 1(N=8), 2(N=6), and 3(N=4), which are type favorable, type whereas negative stereotypical, and type neutralist. Favorable types agreed to ensure North Korean refugee groups' rights as a general protection, whereas negative stereotypical types had strong discrimination and prejudice towards North Korean refugee groups due to lack of related knowledge. Furthermore, neutralist types showed an objection to negative stereotypes against North Korean refugee, but they did not entirely agree to North Korean refugee either. It is necessary to develop a detailed strategy to improve the social image of North Korean refugee.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.11
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• pp.3480-3486
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• 2009

This research was based on the purpose of establishing predicted model of prematurely discharged patients using the mandatory information data, recorded in the medical institutes based on discharged patients of a University Hospital for the period of 1 year, from July. The result showed that the regression analysis model was the most excellent method of application model for preventing discharged patients, and when this is applied to discharged patients who are outpatients, the possibility of discharge can be less than staying in the emergency room. In addition, based on threshold 0.7, when we expect the discharged patients, out of 920 discharged patients, the actual patients who are discharged can become 136, showing the extract effectiveness of 14.78%. Based on the perspective of lift value, compared to random extract, this is 2.9 times (14.78/5.15) more effective.

• 한국사회정책
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• v.25 no.1
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• pp.161-194
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• 2018

The purpose of this study is to investigate the factors that interrupt the use of social security of elderly North Korean refugees. As a result of qualitative content analysis using interview data, it is found that the elderly North Korean defectors have a lower access to the social security system. The main reason for hindering the use of social security system is low awareness due to limited information channels, psychological distance to South Korean society and residents. Moreover, this psychological distance is a factor that reduces the geographical accessibility of elderly North Korean defectors by preferring to use services in specific institutions for North Korean, while South Korean elderly people can use the service elsewhere. In addition, there are many cases in which the elderly in North Korean defectors do not receive sufficient social security due to low income. On the other hand, social security systems with high accessibility of older North Korean refugees are characterized by the fact that they are provided by experts who have formed sufficient rapport with North Korean refugees. Therefore, it seems possible to improve the accessibility of elderly defectors' friendly system by professional workers with cultural competence. In addition, a multidimensional approach is needed to fully cope with the complex desires of elderly North Korean defectors and a mechanism should be set up to reflect their opinion in system operation.

• The Korean Journal of Applied Statistics
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• v.37 no.4
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• pp.525-539
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• 2024

Massive multiplayer online role playing game (MMORPG) is a common type of game these days. Predicting user churn in MMORPG is a crucial task. The retention rate of users is deeply associated with the lifespan and revenue of the service. If the churn of a specific user can be predicted in advance, targeted promotions can be used to encourage their stay. Therefore, not only the accuracy of churn prediction but also the speed at which signs of churn can be detected is important. In this paper, we propose methods to identify early signs of churn by utilizing the daily predicted user retention probabilities. We train various deep learning and machine learning models using log data and estimate user retention probabilities. By analyzing the change patterns in these probabilities, we provide empirical rules for early identification of users at high risk of churn. Performance evaluations confirm that our methodology is more effective at detecting high risk users than existing methods based on login days. Finally, we suggest novel methods for customized marketing strategies. For this purpose, we provide guidelines of the percentage of accessed users who are at risk of churn.