• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.5
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• pp.851-856
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• 2015

As crime has actually increased in recent years, various mobile applications related to safety and emergency measure have received much attention. Therefore, IoT (Internet of Things) technologies, which connect various physical objects with Internet communication, have been also paid attention and then diverse safety services based on IoT technologies have been on the increase. However, existing mobile safety applications are simply based on location based service (LBS). Also, as they are independently operated without the help of another safety systems, they cannot efficiently cope with various safety situations. So, this paper proposes the efficient smart safety service architecture with both the risky situation detection using user location as well as various sensing information and the risk congruence measure using the streetlight infrastructure. Additionally, UDID (unique device identifier) is utilized for the secure communication with the control center.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.198.1-198.1
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• 2012

저궤도 위성이 발사체에서 분리된 후 탑재 소프트웨어에 의한 초기 동작이 수행되고 나면 초기 운용이 시작된다. 초기 운용 기간에 수행할 모든 절차와 대처 가능한 긴급 상황이 발생할 경우 수행할 절차는 발사 전에 미리 준비된다. 위성의 각 부분의 설계 마진은 최악 조건을 기준으로 반영되어 있기 때문에 발사 이후의 버스 시스템 관점에서의 위성 특성은 요구 사항을 만족하는 범위가 될 것으로 예상이 가능하다. 실제로 발사 후 위성 텔레메트리 분석을 통해 대부분의 항목에서 요구 조건을 만족하는 것으로 확인되었다. 또한 텔레메트리 분석을 통해 설계 단계에서 예상했던 것 보다 정확한 궤도 특성이 반영된 위성 특성을 파악하였다. 이러한 특성은 설계 시 고려했던 상황과 다르더라도 실제 궤도 특성이 반영된 특성이므로 초기 운용 및 정상 운용 시에 정상적인 상황인 것으로 고려해야 한다. 첫째, 지구 알베도 특성에 따라 태양센서 값이 궤도에 따라 변화한다. 위성의 자세가 정확히 태양을 지향하고 있더라도 태양센서에 지구에서 반사된 빛이 입사되어 자세 제어에 영향을 주게 된다. 알베도의 영향은 적도에서 극지방으로 갈수록 커지며, 계절에 따라 다른 특성을 보인다. 알베도의 영향을 최소화하기 위해 자세 제어 모델에 알베도 효과를 고려하거나 알베도 효과를 무시할 수 있을 정도로 자세 제어 오차 한계를 조정할 수 있다. 둘째, 위성의 지구 회피 회전에 의해 태양 전지판의 온도가 궤도에 따라 변화한다. 위성체는 위성체에 장착된 두 개의 별센서의 가시성 확보를 위해 태양 지향 자세에서 요축으로 일정 속도로 회전한다. 남극 부근에서는 두 태양 센서가 모두 지구의 반대편인 남쪽을 지향하도록 하며, 북극 부근에서는 북쪽을 지향하도록 한다. 이 때 두 태양 센서의 방향에 장착된 태양 전지판은 극지방에서 지구 반대편에 위치하므로 다른 태양 전지판에 비해 낮은 온도를 갖게 된다. 이 논문에서는 위성의 궤도 특성에 따른 고려 사항에 대해 설명하였다.

• The Journal of the Korea Contents Association
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• v.19 no.1
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• pp.266-277
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• 2019

This study is an exploratory study on the factors that affect the types of user's coping strategies in online game harassment situations. A survey(N=416) was conducted to investigate the experiences of harassment in online games, expectations on organizational response, and the frequencies of selecting each type of coping strategy. The result shows that the female users usually experience more harassment than the male users, especially in sexual harassment. Female users often choose gender masking, seeking help, avoidance, and mirroring strategies compared to males, while males choose self-blame. The effects of harassment experiences, expectation on organizational response, and gender on each type of coping strategy were analyzed using the structural equation model(SEM). Sexual harassment experiences significantly affect all types of strategies, and the higher the expectation on organizational response, the more likely users to seek help rather than to select gender masking. These results are expected to serve the basis for establishing harassment-related regulations in online games.

• The Southeast Asian review
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• v.27 no.2
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• pp.155-184
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• 2017

ASEAN marking its 50th anniversary in 2017 draws hopes and concerns. There is hope for the full realization of the vision of ASEAN Community since 2015 while there are increasing concerns about the changing internal and external environments. This article reviews the process of ASEAN's community building and its external relations. First, after reviewing institutionalization and functional cooperation in 2016, it argues that there is increasing pressure for the modification of the 'ASEAN Way' mainly due to the recent political changes in some ASEAN member states. Second, this article considers the nature of ASEAN's external relation focusing on continuity rather than change. The tendency of external relations of ASEAN appears to be 'avoiding conflict' and 'status quo' while it concentrates on development cooperation. We argue that such attitude contributes to the unity of ASEAN as it is useful in searching for regional resilience which is a common goal of ASEAN power elites.

• Journal of radiological science and technology
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• v.30 no.4
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• pp.305-311
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• 2007

Contrast medium is a useful drug for radiological examinations and usability of it gradually increases while it has some inevitable adverse reaction and it is difficult to predict the occurrence and the degree of adverse reactions. Although the patient consented permission for the use of contrast media, the hospital could not be exempted from the responsibility for the adverse contrast media reaction. During radiological contrast media examination, the radiologist and the contrast media producer have the duty of precaution, prediction and avoid adverse results. In addition, they have reliabi lity of patient remedy for neglecting the duty. Since contrast medium are manufactured or processed as movable properties, the manufacturers are bound to the product liability if damages occur due to the defects in pharmaceuticals. In consideration of the characteristics of product liability, it is necessary to demand high degree of duty of care and diligence from producer or to reduce patient's burden of proof in a product liability lawsuit. For securing compensation ability and liability implementation, products compensation liability insurance is required for contrast medium manufacturers. In conclusion, contrast medium producer has legal liability for adverse reactions and the contract concluded with producer and hospital including legal liability will reduce liability of hospital and radiologist, patient.

• Journal of Hospice and Palliative Care
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• v.19 no.1
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• pp.34-44
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• 2016

Purpose: The purpose of this paper is to identify a theoretical basis of end-of-life care by examining attributes of the concept of the nurses' acceptance of patient deaths. Methods: Walker and Avant's approach to concept analysis was used. A literature study was performed to check the usage of the concept. To identify the attributes of the concept and come up with an operational definition, we analyzed 16 qualitative studies on nurses' experiences of death of patients, published in a national science magazine from 1999 to 2015. Results: The nurses' acceptance of death of patients was identified as having four attributes: acceptance through mourning, attaining insight on life and death while ruminating life, facing with fortitude and practicing human dignity. Antecedents of the concept were experiences of patient's death, confusion and conflict, negative emotions, passive responses, denial of patients' death. The consequences of the concept were found as the holistic end-of-life care and active pursuit of life. Conclusion: This study on the attributes of the concept of the nurses' acceptance of death of patients and it's operational definition will likely lay the foundation for applicable end-of-life care mediations and theoretical development.

• The KIPS Transactions:PartB
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• v.18B no.5
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• pp.315-324
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• 2011

In Web environment, a flood of spam causes serious social problems such as personal information leak, monetary loss from fishing and distribution of harmful contents. Moreover, types and techniques of spam distribution which must be controlled are varying as days go by. The learning based spam classification method using Bag-of-Words model is the most widely used method until now. However, this method is vulnerable to anti-spam avoidance techniques, which recent spams commonly have, because it classifies spam documents utilizing only keyword occurrence information from classification model training process. In this paper, we propose a spam document detection method using a characteristic of repeating words occurring in spam documents as a solution of anti-spam avoidance techniques. Recently, most spam documents have a trend of repeating key phrases that are designed to spread, and this trend can be used as a measure in classifying spam documents. In this paper, we define six variables, which represent a characteristic of word repetition, and use those variables as a feature set for constructing a classification model. The effectiveness of proposed method is evaluated by an experiment with blog posts and E-mail data. The result of experiment shows that the proposed method outperforms other approaches.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.55 no.4
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• pp.284-291
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• 2010

A simulation modeling for predicting the harvesting date with high potato solids consists of development of mathematical models. The mathematical model on potato growth and its development should be obtained by using agricultural elements which analyze relations of solar radiation quantity, temperature, photon quantity, carbon dioxide exchange rate, water stress and loss, relative humidity, light intensity, and wind etc. But more reliable way to predict harvesting date against climatic change employs in vivo energy consumption for growth and induction shape in a slight environmental adaptation. Therefore, to calculate in vivo energy loss, we take a concept of estimate of the amount of basal metabolism in each tuber on the basis of $Wm={\int}^m_tf(x)dt$ and $Tp=\frac{Tm{\cdot}Wm^{Tp}}{Wm^{Tm}}$. In the validation experiments, results of measuring solid accumulation of potato harvested at simulated date agreed fairly well with the actual measured values in each regional field during the growth period of 2005-2009. The calculation method could be used to predict an appropriate harvesting date for a production of high potato solids according to weather conditions.

• Journal of the Korea Society of Computer and Information
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• v.18 no.2
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• pp.117-126
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• 2013

Path planning is an essential problem to make virtual characters navigate in many applications including computer games. In many cases, multiple characters move in a group and qualitative aspects of planned paths are emphasized rather than optimality unlike Robotics. In this paper, we propose a two-level path planning algorithm in which the global path is planned for a single character specified as a leader and then the local path is planned to avoid dynamic obstacles while the group following this path. The space for group movement is achieved in the form of square grid array called a grid window. Member characters are located relatively to the leader within a space and moved. The static environment is reduced to the configuration space of this grid window to generate a roadmap on which a grid window can move. In local path planning, only the leader avoids dynamic obstacles by using an artificial potential field and the rest of members are located relatively to the leader in the grid window, which reduces computational load. Efficient algorithms to implement the proposed planning methods are introduced. The simulation results show that a group can handle with dynamic obstacles effectively while moving along the planned path for a static environment.

• Journal of the Korea Convergence Society
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• v.6 no.2
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• pp.13-18
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• 2015

The purpose of the study is to investigate the predisposing factors of posttraumatic stress disorder (PTSD) in fire fighters in Korea and to suggest the program development and solution to the critical incident stress management (CISM) in the future. PTSD is characterized by invasion, withdrawal, negative change of cognition and mood, and hypersensitivity. Trauma memory includes explicit memory and implicit memory. The explicit memory is conscious, cognitive, and descriptive and is controlled by hippocampus. The data of explicit memory have inhibitive and narrative language structure. The implicit memory is inconscious, emotional, and remembered by the body. The implicit memory is controlled by amygdala and has inexpressive language structure. The deletion of implicit memory is the key point to trauma treatment. Critical incident stress management (CISM) is the approach for the solution of PTSD. In conclusion, the essential goal of CISM is the psychological cessation of PTSD. This study tried to suggest the education program development of PTSD.