• International Journal of Advanced Culture Technology
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• v.10 no.4
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• pp.148-152
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• 2022

The purpose of this study was to investigate whether there is a difference in self-reflection and insight according to the performance level of college athletes. A total of 395 (210 male, 185 female) college athletes from 6 universities were sampled. The level of performance was divided into upper, middle, and lower groups based on the results of matches played in the past 1 year. To measure self-reflection and insight, THE SELF-REFLECTION AND INSIGHT SCALE developed by Grant et al. [4] was used. As a result, there was a statistically significant difference according to the level of performance, and as a result of post-hoc(scheffe) analysis, the upper group of performance was higher than that of the middle group and the lower group.

• Journal of the Korean Society for Nondestructive Testing
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• v.23 no.6
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• pp.577-582
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• 2003

This paper describes a new technique for thickness measurement of a very thin layer less than one-quarter of the wavelength of ultrasonic wave used in the ultrasonic pulse-echo measurements. The technique determines the thickness of a thin layer in a tapered medium from constructive interference of multiple reflection waves. The interference characteristics are derived and investigated in theoretical and experimental approaches. Modified total reflection wave g(t) defined as difference between total and first reflection waves increases in amplitude as the interfacial layer thickness decreases down to zero. A layer thickness less than one-tenth of the ultrasonic wavelength is measured using the maximum amplitude of g(t) with a good accuracy and sensitivity. The method also requires no inversion process to extract the thickness information from the waveforms of reflected waves, so that it makes possible to have the on-line thickness measurement of a thin layer such as a lubricating oil film in thrust bearings and journal bearings during manufacturing process.

• International Journal of Advanced Culture Technology
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• v.9 no.4
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• pp.188-193
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• 2021

This is a group pretest-posttest design study that aim to evaluate the effect of self-reflection promotion program of nursing students. The subjects of this study were 42 first-year nursing students. The data was collected from October 5 to November 2, 2020. A questionnaire was used to measure self-reflection and self-efficacy. The self-reflection promotion program was operated for a total of 8 hours in 4 sessions over 4 weeks. Online lectures were conducted using books, movies, and art recommended by expert. The subjects could take lectures using their smartphones, laptops, desktops, and tablet PC. As a result of the study, self-reflection was significantly improved after intervention than before intervention (t=-2.594, p=.013). In the sub-items, self-exploration and self-understanding were statistically significantly improved (t=-2.527, p=.015; t=-2.471, p=.018). However, other-exploration and other-understanding were not statistically significant (t=-1.226, p=.227; t=-.758, p=.453). The self-efficacy of the subjects was not statistically significant (t=-.170, p=.866). In future research, it will be necessary to develop and verify specific teaching and learning methods utilizing various contents that can improve self-reflection for nursing students.

• Journal of the Korean Society of Food Science and Nutrition
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• v.28 no.6
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• pp.1191-1200
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• 1999

This study was designed to determine total lipid and trans fatty acids(tFAs) content of 157 food items commonly consumed in the Korean diet and to prepare the database for the estimation of tFAs intake in Koreans. Total lipid and tFAs content was determined by Bligh and Dyer method and attenuated total reflection infrared spectroscopy, respectively. The content of tFAs in margarines ranged from 0.8% to 25.2%, depending on the manufacturers. In bakery products, cakes contained higher levels of tFAs(0.8~16.9%) than hamburgers(0.8~8.4%) and doughnuts(4.9~10%). The distribution of tFAs in crackers and cookies was wide(0.8~25%), whereas meat and fish products contained 0% to 8.9% of tFAs. Fried chickens had 0% to 14.6% of tFAs and French fries had 5.2% to 18.8% of tFAs. In noodles, nuts, chocolates and fermented fish sauces, tfAs were not detected.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.2
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• pp.46-54
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• 2007

We have fabricated and characterized MMI (Multimode Interference) coupled ring resonator with the total internal reflection mirrors and the semiconductor optical amplifier for the integration of the WDM (Wavelength Division Multiplexing) system. The TIR (Total Internal Reflection) mirrors were fabricated by self-aligned process and had losses of about 0.71 dB per mirror. Coupling in and out of a resonator was achieved using the extremely small MMI couplers. The MMI length and width used in the experiment were $119{\mu}m$ and $9{\mu}m$, respectively. The resulting FSR (Free Spectral Range) and on-off ratio were approximately 1.333 nm (162 GHz) and 13 dB, respectively.

• Journal of the Korean Vacuum Society
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• v.8 no.1
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• pp.13-19
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• 1999

Total reflection X-ray fluorescence spectroscopy using synchrotron radiation source called as TRSFA was explored to achieve high sensitivities to impurity metals on Si wafer surface. It consists of monochromating part to select a specific wavelength, slit part to shield direct beam and to control monochromated beam, and main chamber to dectect fluorescent X-ray counts of impurities on si wafer. Monochromated X-ray of 10.90 KeV was selected and the optimum total reflection condition on silicon wafer was obtained through tuning the dead time and fluorescent X-ray count of Si and Fe. TRSFA system could increase the sensitivity as high as 50 times in comparision with TRXFA using normal X-ray source. But the trend was varied since the surface conditions of Si wafers and, therefore, the reflectivities were different. Furthemore, there seems to be a promising path to reaching a detection limit useful to the next generation metal impurities control, because Fe impurity below to the $5\times10^{9}\textrm{atomas/cm}^2$ can be detectable through the developed TRSFA system.

• Journal of Digital Convergence
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• v.19 no.9
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• pp.445-451
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• 2021

The purpose of this study was to examine the effect of nursing students' abilities of communication and self-reflection on their attitudes toward mental illness. Data were collected from September to October in 2020. In total, 180 questionnaires were collected, and 170 questionnaires among them were used for analysis, excluding 10 with poor responses. As a result, nursing students' communication ability, self-reflection, and attitude toward mental illness showed a significant positive correlation. Nursing students' communication ability and self-reflection were major factors influencing their attitudes toward mental illness, which explained 49% of the total variance. Continuous education to improve students' communication ability and self-reflection level within the nursing department's curriculum will be needed to pursue nursing students' positive attitude toward mental illness. Also, additional education program to improve students' attitudes toward mental illness will be required.

• Korean Journal of Optics and Photonics
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• v.31 no.6
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• pp.321-327
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• 2020

We investigated the light reflection from thin films coated on substrates. Using a prism with a high refractive index as the incident medium, the phenomena of the total internal reflection (TIR) of the prism/film/substrate system and the light coupling into the optical waveguide formed by the air/film/substrate system were comprehensively studied and compared. If the refractive index of the thin film is greater than that of the substrate, within the TIR region of the substrate, sharp reflection minima occur at specific angles where the waveguide modes are excited, that can be used to accurately measure the refractive index and thickness of a thin film. On the other hand, if the refractive index of the thin film is smaller than that of the substrate, such waveguide modes do not exist. In this case, although not so distinct as a bulk medium, the TIR effect of the thin film is still observable, accompanied by an interference pattern. In this study we analyzed the overall reflection phenomena occurring from prism/film/substrate structures, to investigate the possibility of measuring the refractive index of a thin film in both cases.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.24 no.5
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• pp.433-441
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• 2006

With a development of electrical technology in recent, it is possible to measure distance without direct contact to object using laser which launched at instrument and reflect from object. Furthermore, the advent of non prism total station brought the increment of application in many fields including not only road, airport, and harbors but also measurement and monitoring of structural displacement in construction fields. In this study, therefore, to evaluate accuracy of non prism total station, accuracy was analyzed by measuring certain distance which classified by both certain materials and angle of reflection. By this method, the derived values were applied to topographical survey for the efficient applicability. According to a study, result value of non prism total station was satisfBctory regardless of material when the angle of reflection was 90 degrees. RMSE increased when the angle of reflection are gradually increased to acute angle. In result of regression analysis using certain distance which classified by both materials and angles of reflection, there is relationship between distance and angle of reflection, but material has no relevance to the result value. When carrying out general topographical survey, proper application of non prism total station will go far conducting safe and prompt survey at the dangerous site such a road which have lots of traffic flow and rock joint which have high angles of inclination.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2006.04a
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• pp.27-32
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• 2006

Applications for developed non-prism total station which can decides three dimensional position without prism are increasing in variety survey fields. However, distance measurement using non-prism method is lower accurate than prism method because laser strength reflected from materials is varied by angle of reflection and materials. Therefore, distance measured using non-prism total station by angle of reflection and materials is compared with that using pnsm method, and its characters are introduced applying non prism total station in topographic surveying.