• Korean Chemical Engineering Research
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• 제62권2호
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• pp.163-172
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• 2024

In this study, two different scenarios for ammonia liquefaction in the green ammonia manufacturing process were proposed, and the economic-feasibility and environmental impact of each scenario were analyzed. The two liquefaction processes involved gas-liquid separation before cooling at high pressure (high pressure cooling process) or after decompression without the gas-liquid separation (low pressure cooling process). The high-pressure cooling process requires higher capital costs due to the required installation of separation units and heat exchangers, but it offers relatively lower total utility costs of 91.03 $/hr and a reduced duty of 2.81 Gcal/hr. In contrast, although the low-pressure cooling process is simpler and cost-effective, it may encounter operational instability due to rapid pressure drops in the system. Environmental impact assessment revealed that the high-pressure cooling process is more environmentally friendly than the low-pressure cooling process, with an emission factor of 0.83 tCO₂eq less than the low-pressure cooling process, calculated based on power usage. Consequently, the outcomes of this study provide relevant scenario and a database for green ammonia synthesis process adaptable to various process conditions.

• Journal of The Korean Association For Science Education
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• 제27권9호
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• pp.907-918
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• 2007

This study was conducted to explore key factors of expertise development of talented scientists who achieved outstanding research performance according to the stages of expertise development and dimensions of individual-domain-field. To fulfill the research purpose, 31 domestic scientists who were awarded major prizes in the field of science were interviewed in-depth from March to September, 2007. Stages of expertise development were analyzed in light of Csikszentmihalyi's IDFI (individual-domain-field interaction) model. Self-directed learning, multiple interests and finding strength, academic and liberal home environment, and meaningful encounter were major factors affecting expertise development in the exploration stage. In the beginner stage, independence, basic knowledge on major, and thirst for knowledge at university affected expertise development. Task commitment, finding flow, finding their field of interest and lifelong research topic, and mentor in formal education were the affecting factors in the competent stage. Finally, placing priority, communication skills, pioneering new domain, expansion of the domain, and evaluation and support system affected talented scientists' expertise development in the leading stage. The meaning of major patterns of expertise development were analyzed and described. Based on these analyses, educational implications for nurturing scientists were suggested.

• The Korean Journal of Archival Studies
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• 제80호
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• pp.197-232
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• 2024

This study aims to understand archival art, which is spreading in the art world, and to look at records in a new way. Archival art refers to the act of creating and exhibiting art using records as a medium of expression. Archival art is attracting attention as a method of exhibition and creation of works, forming a trend in contemporary art. Archival art was born amid changes in art creation methods resulting from the rise of conceptual art, the development of media including photography and advancements in digital technology, and the influence of Foucault and Derrida's discourse on archives. The encounter between archives and art, which originated from photographic aesthetics in the 1920s, led to archival turn in contemporary art in the 1990s, thanks to the spread of conceptual art, digital technology, and postmodernism. Archival art not only subverts traditional art creation methods, but also includes criticism and deconstruction of social systems, including modern archives. Archival art rearranges and reorganizes records according to the artist's intention, and even accepts fiction rather than fact. The essence of records in archival art is not the reproduction of the past, but the expression of present needs. The way records are utilized in archival art shakes up the concept of records in archival science, calling for a new look at records as objects with not only legal and administrative value but also aesthetic value.

• The Korean Society of Law and Medicine
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• 제24권3호
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• pp.105-124
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• 2023

Modern society is facing an unstable environment due to unexpected accidents and hazardous situations. For example, incidents such as the collapse of the Bundang Bridge and the crushing accident in Itaewon could serve as examples. In addition to these, critical emergencies like sudden cardiac arrests and strokes frequently occur, requiring swift actions and smooth transfers to specialized medical institutions for effective responses. In response to these risks, the country has been establishing various systems to protect the lives and safety of its citizens. Among these, the 119 First Aid Activities plays a crucial role within the emergency medical system. Its goal is to promptly respond to critical emergency situations involving severe trauma patients or patients with serious illnesses, minimizing damage and safeguarding lives by swiftly transferring them to emergency medical institutions for specialized treatment. The core activity related to this is emergency rescue operations. In particular, the 119 First Aid system serves as a crucial institution responsible for the hospital transportation of emergency patients. However, rescue personnel still encounter cases of interference with their activities during their duties. Despite efforts from the police, these interference cases persist, and they share similarities with the crime of obstructing official duties. Interference with emergency activities exhibits a comparable nature to instances such as physical assaults and equipment damage against emergency medical practitioners working within the emergency medical system. Therefore, a comprehensive understanding and improvement efforts regarding the issues of interference that arise during the process of emergency medical activities, including the 119 First Aid system, are necessary. The solution to these problems is to establish and improve the conditions for obstruction of first aid activities, focusing on the "Framework Act on Firefighting" and the "Act on 119 Rescue and Emergency."

• Journal of the Korean BIBLIA Society for library and Information Science
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• 제35권2호
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• pp.25-45
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• 2024

This study aims to understand the everyday information-seeking behaviors of Alpha-generation elementary school students. A survey was conducted among 4th to 6th grade students to investigate their information needs in daily life, the sources they use to fulfill these needs and the reasons for their choices, the barriers they encounter during the information search process, and their satisfaction and trust in the information obtained. The results indicate that Alpha generation elementary students most frequently use video platforms and have the highest information needs related to hobbies and leisure activities. The main reasons for choosing information sources were familiarity and convenience. Differences based on demographic characteristics and media literacy education were also analyzed. There were significant differences in information-seeking behavior based on gender. Also, students who had received media literacy education experienced fewer difficulties in the information acquisition process compared to those who had not. The findings of this study are expected to provide valuable data for developing information services and media literacy education directions for the Alpha generation in school settings.

• Journal of Christian Education in Korea
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• 제76권
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• pp.173-192
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• 2023

Purpose of study: The purpose of this study is to suggest the direction of Christian self-identity while paying attention to the metaverse era. It suggests the direction of education that forms a Christian self-identity based on the problems of identity crisis that may arise due to the problem of de-realization while accepting the situation of the metaverse that has emerged due to the digital revolution. Research content and method: Focusing on the discussion of metaverse and de-realization, this paper suggests the importance of Christian self-identity and the direction of education. For this purpose, four tasks of practical theology were carried out based on Richard Osmer's consensus model. As the desciptive-empirical task was carried out, the opportunities and risks of the metaverse were brought up. Through the interpretive task, the problem of metaverse and de-realization was presented. The normative task emphasized the importance of Christian self-identity, and the pragmatic task proposed an education oriented towards Christian self-identity. Conclusions and Suggestions: It is important for education in the metaverse era to form a sense of Christian self-identity. The purpose of education is the formation of Christian's self-identity, and the content is to build the Christian relationality self, equality self, and openness self. The teaching method is interactive teaching, and the teacher and learner can be presented as an encounter between interpreters. The environment is any area of interpreted life, and evaluation can manifest itself in Christian life as disciples and citizens. The suggestion is to suggest compedency education methods for acquiring Christian self-identity while considering various generations.

• Journal of Christian Education in Korea
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• 제75권
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• pp.127-152
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• 2023

Purpose of study: This study aims to explore 'labyrinth walking,' a lesser-known Christian spiritual practice within the Korean church. Additionally, it intends to propose ways for implementing labyrinth walking through literature reviews encompassing theory and practice. Research content and method: The article begins with its exploration by defining labyrinth walking from a historical perspective. It was a spiritual practice that existed in the Middle Ages, involving the traversal of a labyrinthine shape, typically a single path on the floor, often accompanied by prayer or contemplation. The contemporary spiritual practice of labyrinth walking was recovered and reinterpreted by Christian scholars and spiritual directors during the mid and late twentieth century. Additionally, within Christianity, labyrinth walking, rich with symbolism representing Jesus' suffering and salvation, baptism, pilgrimage, and purification, comprises five essential steps: preparing, walking with prayer or contemplation, remaining in the center, returning, and journaling and sharing. By merging pilgrimage, walking, prayer, and meditation, the practice of walking the labyrinth can enable people to have an opportunity for retreat, to encounter and be accompanied by God, to experience moments of serenity and healing, to reflect on themselves, to create life-transforming resolutions, and to build a sense of community. As a result, many Korean churches should acknowledge the value of and utilize labyrinth walking to nurture faith and spirituality. Conclusions and Suggestions: Accordingly, this paper suggests some practical ways to employ labyrinth walking as a form of prayer, part of a ritual or religious activity, an embodiment of pilgrimage, and a tranquil and nonverbal experience. Furthermore, the study recommends that Korean churches establish proper goals, consider essential principles for labyrinth design and installation, and follow specific guidelines while conducting labyrinth walks.

• Journal of Korean Home Economics Education Association
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• 제35권4호
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• pp.47-60
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• 2023

The purpose of this study was to examine students' experiences in the dietary life class using traditional Korean desserts in middle school home economics classes. Participatory observation, in-depth interview, and site data collected in this study were analyzed through emic coding, and the results are as follows. First, students had 'expectations about Han-gwa lab classes.' Students were always positive about lab classes, looking forward to eating delicious food and eagerly awaiting their first lab class since entering middle school. Additionally, there were many students who were experiencing Han-gwa for the first time, so expectations about learning about Han-gwa were high. Second, students engaged in 'self-directed learning through the Han-gwa project.' In other words, while creating an activity book about Han-gwa, the students realized self-directed learning about the differences between Han-gwa and Yang-gwa (Western-style sweets), and the scientific principles of cooking Han-gwa. Third, students had 'instilled pride in Han-gwa through lab classes.' The students learned that there was sufficient awareness and change in values to cherish Han-gwa and to inherit its traditions. Fourth, there was a 'potential curriculum effect.' Students who did not experience face-to-face group activities for three years in middle school due to COVID-19 came to recognize the importance of collaboration and even tried making Han-gwa at home. In order for students to have pride in Han-gwa, it was confirmed that it was necessary for home economics teachers at school to actively teach classes on traditional foods and provide students with many opportunities to encounter them.

• The Korean Journal of Applied Statistics
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• 제37권4호
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• pp.395-410
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• 2024

Text data is usually made up of a wide variety of unique words. Even in standard text data, it is common to find tens of thousands of different words. In text data analysis, usually, each unique word is treated as a variable. Thus, text data can be regarded as a dataset with a large number of variables. On the other hand, in text data classification, we often encounter class label imbalance problems. In the cases of substantial imbalances, the performance of conventional classification models can be severely degraded. To improve the classification performance of support vector machines (SVM) for imbalanced data, algorithms such as the Synthetic Minority Over-sampling Technique (SMOTE) can be used. The SMOTE algorithm synthetically generates new observations for the minority class based on the k-Nearest Neighbors (kNN) algorithm. However, in datasets with a large number of variables, such as text data, errors may accumulate. This can potentially impact the performance of the kNN algorithm. In this study, we propose a method for enhancing prediction performance for the minority class of imbalanced text data. Our approach involves employing variable selection to generate new synthetic observations in a reduced space, thereby improving the overall classification performance of SVM.

• The Korean Journal of Air & Space Law and Policy
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• 제24권2호
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• pp.163-186
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• 2009

The missile technology and its development in south Korea have been restrained to the limit of 180 km by America which instead provided to Korea with security protection. In the same vein, America pressured South Korea to abort its nuclear weapons program so as to prevent another possible military encounter that can easily develop into a war between South and North Korea. This restraint was a bit relaxed when South Korea joined the Missile Technology Control Regime (MTCR) in 2001 whereby the limit was 300 km. The situation of South Korea is in much contrast with its neighbor, North Korea, which has fired Taepo Dong 1 and Taepo Dong 2 to put its alleged satellite respectively into the Earth orbit. The range of this rocket believed to be reaching more than 5,500 km, a range of the intercontinental ballistic missile, without any rein. South Korea that has just geared its full powers for its outer space industry, with the current space projects of putting its satellites into the low Earth orbit, will in future put its satellite into the geostationary orbit, 36,000 km above the Earth. To do so, such restraint had better be resolved. Korean space industry, as it is alike in other countries, started with putting and manufacturing sounding rockets, producing satellites but relying on foreign launching facilities, and learning launching capacities. Experiencing three time launchings of KITSAT, the current satellite projects of Korea are undertaken as follows: - Koreasat - STSAT - Komsat - MBSAT - COMS (Communication, Ocean, and Meteorological Satellite) Koreans waked up to the things of outer space in 2008 with the first Korean astronaut Li So-yeon, a lady bio systems engineer. Although the first Korean made rocket in cooperation with a Russian company to fire last August 2009 was a failure, it should be considered as an inevitable process for future endeavors. There are currently three outer space related laws of Korea: Aerospace Industry Development Promotion Act 1987, Outer Space Development Promotions Act 2005, and Space Damage Compensation Act 2008. The first two stemming from the two different ministries are, however, overlapping in many aspects and have some shortcomings to be improved.