• Nuclear Engineering and Technology
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• v.44 no.8
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• pp.855-870
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• 2012

The paper deals with three main topics: a) the definition of System Thermal-Hydraulics (SYS TH), b) a historical outline for SYS TH and, c) the description of elements for reflection when planning research projects or improvement activities, this last topic being the main reason for the paper. Distinctions between basic thermal-hydraulics and computational Fluid-Dynamics (CFD) on the one side and SYS TH on the other side are considered under the first topic; stakeholders in the technology are identified. The proposal of Interim Acceptance Criteria for Emergency Core Cooling Systems in 1971 by US NRC (AEC at the time) is recognized as the starting date or the triggering event for SYS TH (second topic). The complex codes and the main experimental programs (list provided in the paper) constitute the pillars for SYS TH. Caution or warning statements are introduced in advance when discussing the third topic: a single person (or a researcher) has little to no possibility, or capability, of streamlining the forthcoming investments or to propose a roadmap for future activities. Nevertheless, the ambitious attempt to foresee developments in this area has been pursued without constraints connected with the availability of funds and with industrial benefits or interests. Demonstrating the acceptability of current SYS TH limitations and training in the application of those codes are mentioned as the main challenges for forthcoming research activities.

• Journal of Korean Academy of Nursing
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• v.46 no.2
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• pp.168-182
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• 2016

Purpose: The purpose of this qualitative study was to evaluate the experience of role adaptation from nurse to member of the nursing faculty. Methods: Data were collected from 13 members of a nursing faculty through in-depth interviews. The main question asked was "Could you describe your experience from being a nurse to becoming a member of the nursing faculty?" Qualitative data from the field and transcribed notes were analyzed using Strauss and Corbin's grounded theory methodology. Results: The core experiential category of role adaptation from nurse to member of the nursing faculty was 'striving for survival from culture shock'. The participants used the following three interactional strategies: 'recognizing everything and entering the school environment', 'self-reflection on being a professor and integration of experiences', and 'finding a way of adapting'. Conclusion: The participants tried to adapt to life as a professor and reflected on and integrated their experiences into their new life on the faculty. College faculty need to understand the impact of changes and challenges faced by new professors during role adaptation and to support this adaptation through mentorship and organized orientation programs.

• Composites Research
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• v.14 no.2
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• pp.43-49
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• 2001

The characteristics of smart skin for wireless LAN system under compression load are investigated. The smart skin structure is composed of 3 layers of face material and 2 layers of core material. Theoretical formula for determining buckling load is derived by Rayleigh-Ritz method and compared with experimental result. The maximum length of specimen that buckling does not occur is determined by assuming that the compression load is sustained by only face material. In the experiment, if buckling occurs obviously then it follows the theoretical result well. In the process of buckling, the load supporting capability and the antenna property such as radiation pattern and reflection coefficient were examined.

• Agricultural and Biosystems Engineering
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• v.6 no.1
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• pp.1-7
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• 2005

Assessing health condition of crop in the field is one of core operation in precision fanning. A sensing system was proposed to remotely detect the crop health condition in terms of SP AD readings directly related to chlorophyll contents of crop using a multispectral camera equipped on ground-based platform. Since the image taken by a camera was sensitive to changes in ambient light intensity, it was needed to convert gray scale image data into reflectance, an index to indicate the reflection characteristics of target crop. A reference reflectance panel consisting of four pieces of sub-panels with different reflectance was developed for a dynamic calibration, by which a calibration equation was updated for every crop image captured by the camera. The system performance was evaluated in a field by investigating the relationship between com canopy reflectance and SP AD values. The validation tests revealed that the com canopy reflectance induced from Green band in the multispectral camera had the most significant correlation with SPAD values $(r^2=0.75)$ and NIR band could be used to filter out unwanted non-crop features such as soil background and empty space in a crop canopy. This research confirmed that it was technically feasible to develop a ground-based remote sensing system for assessing crop health condition.

• Journal of Engineering Education Research
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• v.23 no.3
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• pp.20-31
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• 2020

The purpose of this study is to suggest a meaningful way of implementing science and engineering integrated lessons in school science settings. To this end, two types of science and engineering integrated lesson units (focusing on the physic concepts of light and wave) were developed based on the core elements of science and engineering integrated lesson; object, context, engineering design, and connection with science. These two units were implemented in free semester program in a middle school in a metropolitan city. Throughout the process of program implementation, instructor's reflection and focus group interview with participant students were collected to reveal problems arising from the field implementation. In addition, engineering education experts were interviewed to discuss the potential problems and possible solutions for the problems. As results of the study, five main problems of implementing escience and engineering integrated lessons in a school science setting were revealed and practical solutions for the problems were suggested by the experts.

• Korean Institute of Interior Design Journal
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• v.15 no.6 s.59
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• pp.247-254
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• 2006

Apparently light does exist even if it does not have certain form that an object might have. The history of architecture can be told as the history of light. As various master architects as well as scholars mentioned, light has been recognized as one of the most important aspects in perceiving space. Although there are complex multi dimensions in body sense and perception, experiencing space through light is preliminary formed by the outline to the degree of brightness. Light gives space specific and unique character by limiting or enlarging the space by wrapping an object or by reflection of material surfaces or by the intensity of light itself. It is fundamentally important to recognize the essential relationship between light and perception of space through various medias such as material, form, movement and so on. Three types of space perception and cognition by light that have been categorized after studying the most significant writings on light become the core method to further analyze the selected case projects. In this research, we will study how interior space is expressed through different light conditions with above mentioned characteristics and how such expressions can be applicable to the design of interior space.

• International Journal of Costume and Fashion
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• v.8 no.2
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• pp.20-31
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• 2008

A person's external image is a non-verbal form of communication, through which the person's tastes, mode of thought, preferences, and overall personality is expressed. The dominant factor in building an external image is clothing, since clothing-images provide the most information about a person in the least amount of time. This study aims to investigate the relationship between the clothing- images of women politicians and the improvement of women's social status in Korea, by focusing on changes in clothing-image of female politicians at public functions throughout modern Korean history, and inquiring into the method of classification concerning aforementioned images. The time period of this study starts from 1945, when the first female political party was established, to the 2008 presidential elections. The methodology of this study consists of literature study of related books, theses and journals, which was jointly conducted with empirical study consisting of the research of news photographs of major daily newspapers. This study confirmed the clothing images of women politicians since liberation till 2000's reflects the directions of women's movement and their status in return. It is especially meaningful that the sudden increase of romantic and feminine images among the women politician in Korea is the reflection of the ideas of postmodern feminism which emphasize the acknowledgement of womanhood and the enjoyment of being a woman as its core.

• Transactions on Electrical and Electronic Materials
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• v.12 no.6
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• pp.241-244
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• 2011

An isolator transmits light in the forward direction and blocks light from passing in the reverse direction. It is regarded an essential optical component in medical, industrial, and research lasers for blocking reflection beams that cause optical damage and noise. It is also used as a communicative light intensifier to expand the lifespan of devices and enhance transmission quality. This study analyzed the characteristics of the core components in the construction of a polarization-independent isolator, namely, the walk-off polarizer and the Faraday rotator. Measurement of the extinction ratio of the resultant walk-off polarizer revealed that the ratio between the vertical and horizontal rays was 1,050:1 with a laser output of 0.032 W and 1,010:1 with a laser output of 2.68 W, thus presenting ratios similar to 1,000:1. In addition, the walk-off polarizer and Faraday rotator constructed in this study were used to compare output changes according to changes in power of input light and to check the penetration ratio. Results from the study presented variations in output value according to changes in power of input light. However, the average penetration ratio remained relatively consistent (~81.4%).

• Journal of the Korean Society for Precision Engineering
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• v.30 no.10
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• pp.1017-1022
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• 2013

Currently, various optical fiber tips are used to deliver laser beam for endoscopic surgery. In this paper, we demonstrated multidirectional (forward and side) firing optical fiber tip using a femtosecond micromachining and $CO_2$ laser polishing technology. We controlled the edge width of optical fiber tip, by modulating the condition of $CO_2$ laser, to regulate the amount of side and forward emission. The distal end of the optical fiber with core/clad diameter of $400/440{\mu}m$ was microstructured with cone shape by using a femtosecond laser. And then the microstructured optical fiber tip was polished by $CO_2$ laser beam result in smoothing and specular reflection at the surface of the cone structure. Finally, we operated the LightTools simulation and good agreement was generally found between the proposed model and experimental simulation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.735-737
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• 2016

In this paper, we conducted a test of the 3D printer injection method and LSU (Laser Scanning Unit) feature a fusion of the polygon mirror scanning system that is the core mechanism operation for 3D printers for office laser printers SLA system. These tests ensure that the laser was operating and control well was confirmed that a certain point is output to the X-axis by means of a laser module and a polygon mirror. And confirmed after the F-theta lens is incident on the fixed laser power of the beam, and correction according to the correction beam on the mirror reflection was confirmed jineunji the focus according to the Z-axis upper plate.