• Korean Journal of Head & Neck Oncology
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• v.34 no.2
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• pp.61-64
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• 2018

Malignant lesion of the trachea predominantly results from direct spread of adjacent tumors, whereas primary tracheal malignancies are rarely observed. Tracheal tumors are usually diagnosed late on account of delayed specific symptoms: dyspnea, stridor, coughing and hemoptysis. Primary tracheal tumors, although very rare, may extend into the thyroid gland and present as a thyroid mass. Surgery, followed by adjuvant radiotherapy, is the treatment of choice. A case of primary tracheal cancer with thyroid invasion is reported, and a review of the literature is presented.

• Cross-Cultural Studies
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• v.46
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• pp.113-142
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• 2017

The goal of this paper is to analyze the vocabularies and cases related to Kimchi as a cultural history. For this purpose, we extract the vocabularies of Kimchi from the records of Korean Literary Collection in Classical Chinese, Annals of the Choson Dynasty, Records of Daily Reflection, and Diary of the Royal Secretariat. The existing literatures related to Kimchi are confined to some cookbooks, but in this study, we attempt to overcome the existing limitations and adopt a comprehensive and systematic approach. The classic literatures of the Choson Dynasty are mainly recorded in traditional Chinese characters; therefore, the readability is poor, and it is presupposed that a lot of time and effort will be needed for the translation work after securing the data. Therefore, we performed this research with a focus on this part. Next, we tried to reconstruct the archetype of Kimchi culture in the Choson Dynasty by classifying the above materials according to the subject and literature sources.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.172-175
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• 2016

Time of Flight(ToF) LiDAR(Light Detection And Ranging) technology has been used for distance measurement and object detection by measuring ToF time information. This technology has been evolved into higher precision measurement field such like autonomous driving car and terrain analysis since the retrieval of exact ToF time information is of prime importance. In this paper, as a accuracy indicator of the ToF time information, timing jitter was measured and analyzed through Single-Shot LiDAR system(SSLs) mainly consisting of 1.5um wavelength MOPA LASER, InGaAs Avalanche Photodiode(APD) at 31M free space environment. Additionally, we applied spline interpolation and multiple-shot averaging method on measured data through SSLs to improve ToF timing information.

• Korean Journal of Ichthyology
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• v.31 no.3
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• pp.141-149
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• 2019

This study presents data on spawning season, weight-length relationships (WLRs) and condition factor of Gadus chalcogrammus inhabiting the middle East Sea, Korea. Monthly changes in the gonadosomatic index (GSI) revealed that the spawning period was from December to March. Overall value of the exponent b, estimated by nonlinear least squares from weight and length data was 2.806, ranging from 2.778 for female fishes to 2.985 for immature group. The b values were similar between spawning and non-spawning, and between female and male fishes, but it was significantly higher for immature than mature fishes. The condition factors were significantly higher for immature than mature groups, and during non-spawning than spawning periods, but it was not significant between male and female fishes.

• (The)Study of the Eastern Classic
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• no.72
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• pp.329-363
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• 2018

The Manual for Buddhist Rituals (1935) is the manual of Buddhist rituals which has a pivotal position in terms of the modernization of Korean Buddhist rituals. The text has been established through the contents and systems of the two texts, The Manual for Practising Rituals (作法龜鑑, 1827) and the Compulsory Manual for Buddhists (佛子必覽, 1931). These three manuals include the examples for practising the Manuals. The analysis of the examples for the practices of the three texts is as follows: The Manual for Practising Rituals tries to include the Sounds of the Music for the Buddhist Rituals through the Four Sounds (四聲) and the Twin words (儷語); the marks of the sounds are excluded after the compulsory Manual for Buddhists. The Manual for Buddhist Rituals has replaced the rituals for repentance (三寶通請) with the rituals for revering (四聖禮): and this text has made it easier that people participate in Buddhist rituals with the text which is written in bilingual format in Korean and Classic Chinese. The text has been popularized through above-mentioned changes against the previous two texts but it has ended up excluding the practices for the music of Korean Buddhism such as the music for Buddhist rituals (梵唄) and reciting the name of Buddhas (念佛).

• Korean Journal of Metals and Materials
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• v.49 no.1
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• pp.79-84
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• 2011

Double-walled carbon nanotubes (DWCNTs) with high purity were produced by the catalytic decomposition of tetrahydrofuran (THF) using a Fe-Mo/MgO catalyst at $800^{\circ}C$. The as-synthesized DWCNTs typically have catalytic impurities and amorphous carbon, which were removed by a two-step purification process consisting of acid treatment and oxidation. In the acid treatment, metallic catalysts were removed in HCl at room temperature for 5 hr with magnetic stirring. Subsequently, the oxidation, using air at $380^{\circ}C$ for 5 hr in the a vertical-type furnace, was used to remove the amorphous carbon particles. The DWCNT suspension was prepared by dispersing the purified DWCNTs in the aqueous sodium dodecyl sulfate solution with horn-type sonication. This was then air-sprayed on ITO glass to fabricate DWCNT field emitters. The field emission properties of DWCNT films related to transmittance were studied. This study provides the possibility of the application of large-area transparent CNT field emission cathodes.

• Korean Journal of Metals and Materials
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• v.49 no.9
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• pp.732-738
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• 2011

Silicon oxide thin films were deposited by using a plasma-enhanced chemical-vapor deposition technique to investigate the light emission properties. The photoluminescence characteristics were divided into two categories along the relative ratio of the flow rates of $SiH_4$ and $N_2O$ source gases, which show light emission in the broad/visible range and a light emission peak at 380 nm. We attribute the broad/visible light emission and the light emission peak to the quantum confinement effect of nanocrystalline silicon and the Si=O defects, respectively. Changes in the photoluminescence spectra were observed after the post-annealing processes. The photoluminescence spectra of the broad light emission in the visible range shifted to the long wavelength and were saturated above an annealing temperature of $900^{\circ}C$ or after 1 hour annealing at $970^{\circ}C$. However, the position of the light emission peak at 380 nm did not change at all after the post-annealing processes. The light emission intensities at 380 nm initially increased, and decreased at annealing temperatures above $700^{\circ}C$ or after 1 hour annealing at $700^{\circ}C$. The photoluminescence behaviors after the annealing processes can be explained bythe size change of the nanocrystalline silicon and the density change of Si=O defect in the films, respectively. These results support the possibility of using a silicon-based light source for Si-optoelectronic integrated circuits and/or display devices.

• Journal of The Korean Association For Science Education
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• v.41 no.2
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• pp.103-114
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• 2021

The purpose of this study is to investigate the history of and recent trends in science education research on emotion and explore the direction of future development. A comprehensive review of literature was conducted, and the results were organized according to research questions. Science education research on emotion began in the state of confusion because a number of concepts coexisted and overlapped in the concept of affect. More systematic approaches were then used when science-related attitudes were divided into the two categories of scientific attitudes and attitudes toward science. The research continued to study on positive and negative emotions relevant to science learning. However, the complex relationship between cognition and emotion and the limitation of the dichotomy dealing with emotions as external factors influencing student learning were revealed. By contrast, the recent research on epistemic emotions were based on the new perspective that scientific practices are accompanied with emotions and that cognition and emotion are integrated into the practices, influencing each other. Therefore, research should be carried out in ways that can help science educators understand a variety of emotions emerging in learning science through scientific practices and respond appropriately to even negative emotions of students.

• Journal of Korean Elementary Science Education
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• v.40 no.2
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• pp.210-226
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• 2021

The purpose of this study was to understand what orientations elementary school teachers have related to their science classes, what realities they encounter in real classes, how they overcome their frustrations and failures they experience. We employed a narrative inquiry method and analyzed the experiences of two early career elementary school teachers (Miss Park and Mr. Choi). Miss Park wanted to conduct students-driven inquiry classes, in which students become active investigators, but in reality, she faced herself who conducted teacher-driven classes. Mr. Choi wanted to conduct science classes based on constructivism, but in reality, he encountered himself as a knowledge giver rather than scaffolder. However, rather than giving up their orientations, the two teachers tried to keep them in their own way. It was expected that by understanding what strategies beginner teachers take when their theoretical orientation and ideals are not well implemented in actual educational reality, we could find a clue that will lead to a more successful transition from pre-service teacher to teacher.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.31 no.2
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• pp.83-86
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• 2020

Patients with tracheoesophageal fistula show signs of aspiration, possibly leading to pneumonia, which could be fatal to bed-ridden patients. Tracheoesophageal fistula occurs as a complication of intubation, tracheostomy tube insertion and nasogastric tube insertion. Possible etiology is pressure and ischemic necrosis given by tracheostomy tube and nasogastric tube to trachea and esophagus; or in some cases, larynx and hypopharynx. Meanwhile, for repair of tracheoesophageal fistula, transcervical approach can be considered but takes relatively long operation time and is not appropriate for patients with underlying diseases. We report a case of tracheoesophageal fistula complicated several years after tracheostomy tube and nasogastric tube insertion who came to medical attention with signs of aspiration. Authors successfully performed repair of the fistula under laryngeal microsurgery approach without skin incision and dissection, and thereby report the experience with review of literature.