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18~19세기 대형 불화에 사용된 회청(Smalt) 안료에 관한 연구
윤지현,김소진,김규호,YUN, Jihyeon,KIM, Sojin,KIM, Gyuho 국립문화재연구원 2022 헤리티지:역사와 과학 Vol.55 No.3
The purpose of this study is to analyze the chemical composition of smalt pigments used in 10 large Buddhist paintings in the Joseon Dynasty using energy dispersive X-ray spectroscopy, and to clarify the material and characteristics by observing morphological characteristics using polarized light microscopy and a scanning electron microscope. Through chemical composition analysis, the smalt of all 10 large Buddhist paintings is judged to be potash glass using SiO<sub>2</sub> as a former and K<sub>2</sub>O as a flux. In addition to the components related to cobalt ore used as a colorant, the paintings were found to contain high levels of As<sub>2</sub>O<sub>3</sub>, BaO, and PbO. The smalt particles did not have specific forms, and were blue in color, with various chromaticity. In some particles, conchoidal fracture, spherical bubbles, and impurities were observed. Through backscattered electron images, it was found that the smalt from paintings produced in the early 18th century AD had a high level of As, but the smalt from paintings produced from the mid-18th century AD onwards exhibited various contrast differences from particle to particle, and there was smalt with high levels of As, Ba, and Pb. Through the above results, the large Buddhist paintings in the Joseon Dynasty are divided into three smalt types. Type A is a type with high As<sub>2</sub>O<sub>3</sub>, type B is a type with high BaO, and type C is a type with high PbO. Looking at the three types of smalt pigments by the period of production, although some in-between periods were not detected, type A was confirmed to have been used from 1705 to 1808, while type B and type C were shown to have appeared in 1750 and used until 1808. This reveals that only one type of smalt was used until the early 18th century AD, and from the middle of the 18th century AD, several types of smalt were mixed and used in one large Buddhist painting. Studies such as this research are expected to provide insights into the characteristics of the smalt pigments used to produce large Buddhist paintings at the time.
윤지현,오준협,김홍규,윤존도,Yun, Jihyeon,Oh, Junhyeob,Kim, Hongkyu,Yun, Jondo 한국재료학회 2016 한국재료학회지 Vol.26 No.5
Appropriate thermo-mechanical properties of nickel-based superalloys are achieved by heat treatment, which induces precipitation and solid solution hardening; thus, information on the temperature ranges of precipitation and dissolution of the precipitates is essential for the determination of the heat treatment condition. In this study, thermal analyses of nickel-based superalloys were performed by differential scanning calorimetry method under conditions of various heating rates of 5, 10, 20, or 40K/min in a temperature range of 298~1573K. Precipitation and dissolution temperatures were determined by measuring peak temperatures, constructing trend lines, and extrapolating those lines to the zero heating rate to find the exact temperature under isothermal condition. Determined temperatures for the precipitation reactions were 813, 952, and 1062K. Determined onset, peak, and offset temperatures of the first dissolution reaction were 1302, 1388, and 1406K, respectively, and those values of the second dissolution reaction were 1405, 1414, and 1462K. Determined solvus temperature was 1462K. The study showed that it was possible to use a simple method to obtain accurate phase transition temperatures under isothermal condition.
/오/-/우/ 합성모음 연속체에 대한 중국인 한국어 학습자의 청지각적 경계
윤지현(Yun, Jihyeon),김은경(Kim, EunKyung),성철재(Seong, Cheoljae) 한국음성학회 2015 말소리와 음성과학 Vol.7 No.4
The present study examines the auditory boundary between Korean /o/ and /u/ on a synthesized vowel continuum by Chinese learners of Korean language. Preceding researches reported that the Chinese learners have difficulty pronouncing Korean monophthongs /o/ and /u/. In this experiment, a nine-step continuum was resynthesized using Praat from a vowel token from a recording of a male announcer who produced it in isolated form. F1 and F2 were synchronously shifted in equal steps in qtone (quarter tone), while F3 and F4 values were held constant for the entire stimuli. A forced choice identification task was performed by the advanced learners who speak Mandarin Chinese as their native language. Their experiment data were compared to a Korean native group. ROC (Receiver Operating Characteristic) analysis and logistic regression were performed to estimate the perceptual boundary. The result indicated the learner group has a different auditory criterion on the continuum from the Korean native group. This suggests that more importance should be placed on hearing and listening training in order to acquire the phoneme categories of the two vowels.
윤지현(Yun, Ji Hyun),박정윤(Park, Jeong Yun) 대한종양간호학회 2016 Asian Oncology Nursing Vol.16 No.4
Purpose: The purpose of this study was to identify the knowledge and compliance of guidelines for safe handling of antineoplastic agents among the oncology nurses. Methods: The participants were 186 nurses from oncology-hematology unit, and outpatient’s infusion room in a tertiary hospital. The levels of knowledge of safety guidelines and compliance with safe handling of antineoplastic agents of oncology nurses were measured using structured questionnaires from October 1 to November 30, 2014. Results: Oncology nurses’ knowledge of guideline for safe handling of antineoplastic agents presented an average 79.7 out of 100 points. Compliance with safe handling of antineoplastic agents presented an average 4.28 (range: 2.9~5) out of 5 points. The knowledge of guidelines for safe handling of antineoplastic agents was related with oncology experience (F=3.78, p=.012). There were positive relationships of knowledge and compliance with safe handling of antineoplastic agents (r=0.23, p=.002). Conclusion: The findings showed that there was a need to establish efficient guidelines for the safe handling of antineoplastic agents and develop our structured, continuous educational program for the improvement of safe practices related to the handling of antineoplastic agents. The developed and enhanced that guideline and educational program would contribute to improvement of staff and patient safety related to the handling of antineoplastic agents.
증례 : 혈액종양 ; ABO 일치 간 이식 후 발생한 Evans syndrome 증례보고
윤지현 ( Ji Hyun Yun ),안지환 ( Jee Hwan Ahn ),조동희 ( Dong Hui Cho ),김태은 ( Taeeun Kim ),송기원 ( Gi Won Song ),이승규 ( Sung Gyu Lee ),이규형 ( Kyoo Hyung Lee ) 대한내과학회 2015 대한내과학회지 Vol.88 No.4
Evans syndrome is a rare complication that develops in adults after liver transplantation. The possible etiologies include ABO mismatch, viral infection, post-transplantation lymphoproliferative disease, graft-versus-host disease, and the use of certain immunosuppressive drugs (e.g., calcineurin inhibitors). Here, we present a case of Evans syndrome that developed after an ABOmatched liver transplant. Glucocorticosteroid, intravenous immunoglobulin, and alternative immunosuppressant therapies all failed. Weekly rituximab (375 mg/m2) was then administered for 4 weeks. The cytopenia improved transiently after the second dose of rituximab, but soon worsened again. However, the cytopenia normalized after a splenectomy.
윤지현(Ji-Hyeon Yun),홍성태(Sung-tae Hong),정상화(Sang-Hwa Chung),김형순(Hyung-Soon Kim) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.2Ⅲ
본 논문에서는 음성과 자연언어의 통합처리를 위한 효과적인 병렬 계산 모델을 제안한다. 음소모델은 continuous HMM에 기반을 둔 문맥종속형 음소를 사용하며, 언어모델은 knowledge-based approach를 사용한다. 또한 계층구조의 지식베이스상에서 다수의 가설을 처리하기 위해 memory-based parsing 기술을 사용하였다. 본 연구의 병렬 음성인식 알고리즘은 분산메모리 MIMD 구조의 다중 Transputer 시스템을 이용하여 구현되었다. 실험을 통하여 음성인식 과정에서 발생하는 speech-specific problem의 해를 제공하고 음성인식 시스템의 병렬화를 통하여 실시간 음성인식의 가능성을 보여준다.
F1/F2의 변화가 한국어 /오/, /우/ 모음의 지각판별에 미치는 영향
윤지현(Yun, Jihyeon),성철재(Seong, Cheoljae) 한국음성학회 2013 말소리와 음성과학 Vol.5 No.3
This study examined the perception of two Korean vowels using F1/F2 manipulated synthetic vowels. Previous studies indicated that there is an overlap between the acoustic spaces of Korean /o/ and /u/ in terms of the first two formants. A continuum of eleven synthetic vowels were used as stimuli. The experiment consisted of three tasks: an /o/ identification task (Yes-no), an /u/ identification task (Yes-no), and a forced choice identification task (/o/-/u/). ROC(Receiver Operating Characteristic) analysis and logistic regression were performed to calculate the boundary criterion of the two vowels along the stimulus continuum, and to predict the perceptual judgment on F1 and F2. The result indicated that the location between stimulus no.5 (F1 = 342Hz, F2 = 691Hz) and no.6 (F1 = 336Hz, F2 = 700Hz) was estimated as a perceptual boundary region between /o/ and /u/, while stimulus no.0 (F1=405Hz, F2=666Hz) and no.10 (F1=321Hz, F2=743Hz) were at opposite ends of the continuum. The influence of F2 was predominant over F1 on the perception of the vowel categories.