• Journal of the Korean Society of Propulsion Engineers
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• v.19 no.2
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• pp.46-54
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• 2015

Nitrous oxide is known as green and safe propellant, and can be supplied by its own vapor pressure. So, many liquid propulsion research institutes and university laboratories use nitrous oxide as oxidizer of experimental liquid rocket engine. However, the unknown explosions occurred twice during hot fire experiments using subscale ethanol/nitrous oxide thruster. In this paper, we surmised that the explosions were caused by the decomposition of nitrous oxide in the injector body and the recondensation of nitrous oxide. Improvement and the safe handling methods are suggested.

• Journal of Korean Home Economics Education Association
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• v.28 no.3
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• pp.47-63
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• 2016

The purpose of this study is to suggest the basic information for diverse and balanced research and development in this field with understanding research trends related to safety education in home economics. In order to so, this study makes population and sampling by targeting cases which refer to 'safety' on 15 papers of academic journals related to home economics registered in the National Research Foundation from 2001 to 2015, 244 papers related to safety education area and 179 master doctorate thesis by searching keyword as 'safety'. Analysis contents are research trends of papers related to safety education by year and by subject and research trends of safety education by area and by research method. As a result of the study, first, the number of research papers related to safety education by year on home economics curriculum repeated increase and decrease and there have been consistent studies conducted on safety education with 14-52 papers per every year and yearly average 28.2 papers. On the other hand, the most number of studies conducted in 2015 with 52 papers which are twice as much of 26 papers in 2014. This seems to be affected by the announcement of safety comprehensive countermeasures from government and the emphasis of safety subject on 2015 curriculum revision of the Ministry of Education. Second, with regards to research trends by topic, 137 papers are related to safety education (29%), 336 papers are related to safety actual condition (71%). Accidents and recognition had a greater percentage in a paper before 2009 (74.4%) and studies are increased after 2009 (from 21 papers to 53 papers) in terms of development or evaluation of safety education program, development of education materials, development of education method etc. Subject area dealt with the most on the research of safety actual condition is regarding safety accidents or effective variables (23.2%). Subject regarding the variables are researches related to factors influencing family violence, internet addiction, spouse violence, willingness to purchase unsafe food, age harassment, or suicidal attempt etc. Next, researches related to safety recognition (13.9%), safety knowledge and attitude (7.4%), safety behaviors (6.3%), safety consciousness (2.3%) show in sequence. Subject area dealt with the most on the researches regarding safety education is development and evaluation of safety education program (11%) and this appears the most in 2015 by year (21.5%). Third, with regards to eight areas of safety education, there are 143 papers regarding public safety (33.8%), 106 papers regarding violence and personal safety (25.1%), 93 papers regarding general subject on safety or whole safety area (22%) and 58 papers regarding drug and internet addiction (13.7%) in sequence. And there is no paper related to first aid and 1 paper is related to occupational safety (0.2%). Occupational safety area is less researched nevertheless its included in home economic curriculum as relative chapter. First aid does not directly correlate with home economics curriculum but should be studied in preparation for accident which could happen in practical class. Forth, with regards to research trends by research method, quantitative research (89.1%) is mostly used and both research study (70.4%) and experimental research (18.7%) are used the most frequently. In particular, researches on the actual condition of safety education and experimental studies for effectiveness verification take most of research method. As qualitative studies, there are phenomenological study (3.1%) and case study (3.1%) related to actual conditions of safety accidents. 10 papers (2.4%) are mixture of quantitative and qualitative research and some research conducted research study and experimental research at the same time (0.9%). With regards to subject of study, human environments (87.5%) are more than physical environments (12.5) and students (48.4%) are more than teachers and school parents (20.6%). As the subject of physical environments, school (6.5%) is the most but home environment is none. As a result of the study, research for the development of evaluation tool for evaluating safety education, occupational safety and lifelong education should be conducted from this time forward. In addition, the object of study shall be expanded to both human environments in terms of entire life and physical environments for home. An in-depth qualitative research should be needed by observing and meeting with each student.

• Child Health Nursing Research
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• v.8 no.4
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• pp.381-390
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• 2002

This study examines the factors that are associated with accidents from riding on inline skates and/or kick boards among students in the elementary schools. Data were collected from 902 students in 3 elementary schools in Seoul. Data were analyzed based on descriptive statistics and chi-square test. The results were as follows: 1. Thirty-eight percent of the students investigated were found to have kick boards while sixty-one percent of the students had inline skates. 2. The age of mothers who answered the questionnaires showed a statistically significant association with injuries of their children on inline skates and/or kick boards. Children whose mothers are younger had a lower percentage of injuries on inline skates and/or kick boards. 3. Children with a lower score on K-CBCL had a higher chance of having an accident from riding on inline skates and/or kick boards. That is, children with lack of attention were more likely to be involved in an accident. First-born children were less likely to have an accident. 4. While mothers' attitudes toward the safety of inline skates and kick boards appeared not to be associated with accidents of their children, their preventive actions for the safety related to riding on inline skates and kick boards reduced the chance to be involved in an accident of their children. In conclusion, this study shows that mothers with children going to the elementary schools should be more action-oriented to prevent their children's accidents from riding on inline skates and/or kick boards than merely recognizing the safety of inline skates and/or kick boards on their own. Implication of these findings and major findings of this study were discussed.

• Convergence Security Journal
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• v.15 no.4
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• pp.113-119
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• 2015

Recent, cyber violence is increasing in a school and the severity of the problems encountered day by day. In particular, the severity of the cyber force using the smart phone is recognized as a very high and great problems socially. Cyberbullying have long damage degree and a wide range time duration against of existed physical cyber violence. Then student's affects is very seriously. Therefore, we analyzes the relationship and languages in the classroom for students to use to identify signs of cyber violence that may occur between friends in the class. And we support this information to identified parent, classroom teachers and school sheriff for prevent cyberbullying accidents in the school. For this research, we will design and implement a messenger in the cyber classroom. It have many components that are Big-data vocabulary, analyzer, and communication interface. Our proposed messenger can analyze lingual sign and friendship between students using Big-data analysis method such as text mining. It can analysis relationship by per-student, per-classroom.

• The Korean Nurse
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• v.24 no.4 s.132
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• pp.118-130
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• 1985

실행(practice)를 위주로 하는 전문직 교육은 실지 실습이나 임상교육등이 필수적이며 중요한 것은 주지의 사실이다. 그러나 전통적으로 대부분의 간호학교가 병원에 소속되어 있어서 간호 임상교육은 그 본 목적인 학생들의 학습보다는 오히려 병원 업무를 돕는 방향으로 잘못 전개되어왔다. 간호교육이 병원에 소속된 간호학교로 부터 학문의 전당인 대학안으로 옮겨지면서 많은 뜻있는 간호교육자들의 노력과 시도로 학생들이 고용인으로 이용되는 상황에서 탈피하여 임상교육이 학생들에게 이론적인 지식을 실지로 응용할 수 있는 복합적이고 통합적인 배움의 경험이 되도록 조금씩 발전해 가고는 있지만 아직도 바라는 만큼 이루어지지는 못하는 실정이다. 현재는 임상실습에 임하는 학생들이 기능적인 일을 반복하며 주어진 시간만을 채우는 경향이 많고 배운 이론을 대학 실습실에서 응용해 보지 못한채 직접 환자 간호에 적응하려면 지나친 불안과 긴장으로 오히려 학습에 장애가 오기도 한다. 또한 환자의 입장을 고려해 보면 그들은 안전하고 완벽한 간호를 받을 권리가 있음에도 불구하고 때로 서투른 학생들의 실습의 대상으로 노출되어 불안을 느끼고 바람직한 간호를 받지 못하는 경우가 많다. 따라서 몇 뜻있는 간호 교육자들은 임상들의 실습장소로 택하는 것은 학생에게는 부적절한 학습 환경이 될 뿐 아니라 환자에게는 도덕적, 윤리적으로 부당하다고 주장한다. 본 연구는 좀 더 잘 설비된 대학의 실습실이 급선무이고 또한 교화적이고 창의적인 실습실의 이용으로 반복적인 임상 실습의 양은 줄이는 한편 학생들의 실력이나 적용 능력의 토대를 탄탄히 하는 몇가지 교육방법을 제시하였다. 물론 제시된 시법이나 작은 그룹별 학습등은 기초 간호학실에서 많이 이용된 방법이기는 하지만 더욱 잘 응용되어야하겠고 역할 재현(role play)이나 유사 상황(simulation) 조성등의 학습 방법으로 기술적인면 뿐만 아니라 대인 관계나 면담기술 및 창의적이며 논리적인 사고의 발달등도 이루어 지리라 기대된다.학생들이 적정량의 기술과 지식을 익힌 후에 좀 더 복합적이고 통괄적인 지식의 응용 및 평가가 필요할 때 실지 임상 실습을 시도하는 것이 바람직한 것이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2019.05a
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• pp.205-207
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• 2019

Special training soldier for thermal equipment during army heavy equipment maintenance education is small training equipment and many trainees have few opportunities for practical training, and there is a high risk of safety accidents during maintenance training. Because practical training is limited and repeated practice is difficult, a training system is needed. In this study, we propose a virtual training system that can reduce the training cost beyond the time and space, enable realistic experiential training, reflect the standard maintenance manual, and train teamwork. The virtual training system using the virtual augmented reality is a system that can reduce the cost beyond the space and time and can be practically practiced. The first-person virtual training system using HMD, which is the three-dimensional display system proposed in this study, is suitable for army thermal equipment maintenance education system. The proposed system is expected to be useful for maintenance training of other equipments and other groups because it has good scalability.

• Convergence Security Journal
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• v.20 no.5
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• pp.65-74
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• 2020

Recently, with the rapid development of eXtended Reality(XR) technology, the development and use of education and training systems using XR technology is increasing significantly. In particular, in areas that involve great risks and high costs such as military training and counter-terrorism training, the use of XR based simulators is preferred because they can improve training performance, reduce training costs, and minimize the risk of safety issues that may occur in actual training, by creating a training environment similar to actual training. In this paper, we propose a plan to build and evaluate an XR based hyper-realistic counter-terrorism education, training, and evaluation system to improve the ROK police's ability to respond to terrorist situations using the 5G and AR based Integrated Command and Control Platform previously developed by the Korea Military Academy. The proposed system is designed to improve counter-terrorism capabilities with virtual training for individual and team units based on hyper-realistic content and training scenarios. Futhermore, it can also be used as a on-site command and control post in connection with a simulation training site and an actual operation site.

• Convergence Security Journal
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• v.23 no.4
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• pp.131-139
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• 2023

In recent years, there have been frequent incidents of invasion of national defense networks by insiders. This trend can be said to disprove that the physical network separation policy currently applied by the Korea Ministry of National Defense can no longer guarantee military cyber security. Therefore, stronger cybersecurity measures are needed. In this regard, Zero Trust with a philosophy of never trusting and always verifying is emerging as a new alternative security paradigm. This paper analyzes the zero trust establishment trends currently being pursued by the US Department of Defense, and based on the implications derived from this, proposes a zero trust establishment plan tailored to the Korean military. The zero trust establishment plan tailored to the Korean military proposed in this paper includes a zero trust establishment strategy, a plan to organize a dedicated organization and secure budget, and a plan to secure zero trust establishment technology. Compared to cyber security based on the existing physical network separation policy, it has several advantages in terms of cyber security.

• The Korean Journal of Food And Nutrition
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• v.30 no.6
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• pp.1299-1309
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• 2017

The aim of this study was to investigate status of safety accidents of school foodservice cooks in Daegu and to analyze the factors affecting the occurrence of the accidents in order to seek effective ways for preventing safety accidents in school foodservice. The survey showed that the most frequent safety accidents were 'bruises', followed by 'burns', 'contact with harmful substances such as disinfectants', 'fall-off ' and 'sprains'. The mental fatigue perception of the respondents was generally lower than the physical fatigue perception. The means of the perception levels of work intensity, cooking environment of the foodservice place, and safety-related behaviors, and consciousness were 3.15, 2.99, and 4.06 out of 5 points, respectively. In addition, the annual average of the number of participating in the accident prevention training per person was 17.34 times, that is, the respondents received the training at least once a month on average. A multiple regression analysis was conducted to investigate the variables affecting the occurrence of safety accidents that happened to foodservice cooks. It revealed that the work intensity perception and the cooking environment perception influenced the frequency of safety accidents.

• Journal of the Korean Society of Earth Science Education
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• v.2 no.1
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• pp.13-22
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• 2009

This study examined the dangerous elements in primary science textbooks and had some suggestions for the minimization of safety accidents in the science class experiments. The research results are as follows: 1) The rate of accident in the primary science experiments was not high, but potential for the outbreak of safety accidents was always present. 2) it is necessary to include safety contents on science textbooks. The survey revealed that only 18 percent of safety education materials include on science textbooks. 3) It will be desirable for science experiment lessons to include safety education materials for safety experiments. This could also help the students develop the right recognition and attitude regarding safety. 4) There was lack of safety devices those were required to be kept at science labs. The survey showed that about 20 percent of the schools had the experimental clothing. 5) Safety training is often conducted in an overly simplified manner, and no special time is allocated to it. In conclusion, to improve the problems pertaining to school safety accident, courses on safety training are essential as textbooks and teachers. Constant and systematic instructions on safety should be done in order to prevent potential safety accidents.