Current Situations of English Education at MUST and its Development Trends

( Baasanjav Soyolsuren ) 현대영미어문학회 2018 현대영미어문학회 추계학술대회 발표논문집 Vol.2018 No.-

Dual-ligand modulation approach for improving supercapacitive performance of hierarchical zinc–nickel–iron phosphide nanosheet-based electrode

Erdenebayar Baasanjav,Parthasarathi Bandyopadhyay,사이드구잔파,임수만,정상문 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.99 No.-

Mixed nanostructured transition metal-based complex materials with hierarchical and porousarchitectures, built from interconnected nano-building blocks, are considered as high-performancepositive electrode materials in supercapacitors (SCs). Herein, zinc–nickel–iron phosphide (ZnNiFe–P) andZn–Ni–Fe–hydroxide precursors (ZnNiFe–OH) were combined in a 3D hierarchical and porous structure(ZnNiFe–(P/OH)) to improve their durability and electrochemical activity by incorporating a dual-ligandsynergistic modulation strategy. The 3D ZnNiFe–(P/OH) architectures, comprising perfectly alignednanosheet arrays (NSA), were successfully grown on Ni foam using a facile hydrothermal processfollowed by partial phosphorization. The dual-ligand ZnNiFe–(P/OH) electrode exhibited excellentspecific capacitance/areal capacitance (1708 F g 1/5.64 F cm 2 for 1 A g 1), high rate performance (62%upto 15 A g 1) and good cycle life. Moreover, the ZnNiFe–(P/OH) NSA positive electrode was coupled withan activated carbon negative electrode to design an asymmetric supercapacitor device. The devicedelivered an excellent capacitance of187 F g 1 at 0.8 A g 1, a superior energy density of58.4 W h kg 1at 600 W kg 1, and an excellent power density of 11250 W kg 1 at 34.4 W h kg 1 while maintaining goodcycling performance (88% after 5000 cycles).

몽골인 학습자의 한국어 비음화와 유음화 발음 오류 양상

바상자브 바야스갈랑 ( BAASANJAV BAYASGALAN ) 숙명여자대학교 한국어문화연구소 2022 한국어와 문화 Vol.31 No.-

본 연구는 한국에 거주하여 한국어를 학습하는 몽골인 학습자의 비음화와 유음화 발음 오류 양상에 대해 알아보고 그 원인을 밝히는 것을 목적으로 한다. 또한 한국어를 학습하는 데 영향을 주는 변인인 숙달도와 거주기간에 따라 학습자의 발음 양상에 차이가 나타나는지에 대해 알아본다. 몽골인 학습자들의 한국어 비음화와 유음화 발음 양상에 대해 알아볼 때 45명을 대상으로 발음 산출 실험을 진행하였다. 발음 산출 실험 자료는 비음화와 유음화 단어가 배치된 문장 단위로 구성되었다. 실험 자료를 분석할 때 한국어 화자의 청취테스트 또는 음성학적인 분석방법을 활용하였다. 또한 학습자의 숙달도와 거주기간에 따른 발음 차이를 분산분석(ANOVA)과 독립표본 t-검정을 통해 검증하였다. 실험결과를 분석할 때 비음화와 유음화의 오류 환경과 오류 양상으로 구분하여 분석하였다. 비음화 오류 환경의 경우, /ㄴ/ 첨가 후 비음화 > 단어 경계에서의 비음화 > 자음군단순화 후 비음화 > 장애음 뒤 비음화 > 평음의 비음화 > 유음의 비음화 순위로 나타났다. 유음화 오류 환경의 경우, 자음군단순화 후 유음화 > /ㄴ/ 첨사 후 유음화 > 순행적 유음화 > 단어 경계에서의 유음화 > 역행적 유음화 순위로 나타났다. 비음화와 유음화의 발음 오류 양상은 규칙 미적용, 탈락, 불완전적용, 대치, /ㄴ/ 미첨가 등 5가지의 양상으로 나타났다. 비음화와 유음화 발음 오류 양상 중 규칙을 미적용하여 표기 그대로 발음하는 오류가 가장 많았다. 규칙 미적용 오류는 한국어와 몽골어의 음절구조 차이로 인하여 발생한 오류로 보았다. 다음으로 탈락과 불완전 적용 또는 /ㄴ/ 미첨가에 관한 오류가 많았으며, 이들 오류는 한국어 음운현상의 복잡성에서 나타난 오류 또는 학습자의 규칙 이해 부족에 관련된 오류로 보았다. 대치 오류는 다른 오류 양상보다 비교적 적었으나 음절 말 /ㄴ/과 /ㅇ/에 관한 오류로 한국어와 몽골어의 음소 차이에 관련된 것이다. 몽골인 학습자의 비음화와 유음화 발음 양상이 숙달도에 따라 차이가 나타나는지를 확인한 결과, 비음화와 유음화 발음에서 모두 유의미한 차이가 검증되었다. 그러나 거주기간에 따라 비음화 발음에서 유의미한 차이를 보였으나, 유음화 발음에서 유의미한 차이가 검증되지 않았다. 본고는 몽골인 학습자의 비음화와 유음화 발음 양상을 한국어 화자의 청취 테스트 또는 음성학적 분석방법으로 분석한 것과 학습자의 발음에 영향을 주는 숙달도와 거주기간 변인에 대해 살펴본 것에 의의가 있다. 본고는 몽골인 학습자를 위한 비음화와 유음화 발음 교육에 참고자료가 되기를 기대된다. The purpose of this study is to find out the causes of nasalization and lateralization pronunciation errors in Mongolian learners who living in Korea. Also, will look into pronunciation aspects according to proficiency and residence period. A pronunciation experiment was conducted on Mongolian 45 learners. When analyzing the experimental data, the Korean speaker's listening test and Praat phonetic analysis programme was used. Also, Mongolian learners proficiency and residence period were verified through analysis of variance ANOVA test and independent sample t-test. An aspects of errors of nasalization and lateralization pronunciations were found to be in five types, rule not applied, dropped out, incompletely applied, replaced, and /ㄴ(n)/ was not added. An aspects of errors of nasalization and lateralization pronunciations were found to be in five types, rule not applied, dropped out, incompletely applied, replaced, and /ㄴ(n)/ was not added. The most common error was not applying the rules. The error of not applying the rule was regarded as an error caused by the difference in syllable structure between Korean and Mongolian languages. Next, there were many errors regarding dropout, incomplete application, or non-addition of /ㄴ(n)/. These errors were viewed as errors in the complexity of Korean phonological phenomena and related to learners' lack of understanding of rules. The replaced errors were relatively few compared to other errors, it is related to the syllable endings /ㄴ(n)/ and /ㅇ(ŋ)/ were related to the phoneme difference between Korean and Mongolian. As a result of confirming the nasalization and lateralization pronunciation aspects according to the proficiency of Mongolian learners, significant differences were verified in both pronunciation. However, although there was a significant difference in nasalization pronunciation according to residence period, no significant difference in lateralization pronunciation was verified. It is expected that this paper will serve as a reference material for the education of nasalization and lateralization pronunciation for Mongolian learners.

모사 슬러리 용액에서 정전류 분극을 활용한 고크롬 주철 부식 시험

바산자프오취개럴 ( Ochgerel Baasanjav ),이준섭 ( Jun-seob Lee ),이예진 ( Ye-jin Lee ),오준석 ( Jun-seok Oh ),이재현 ( Je-hyun Lee ) 한국부식방식학회 2023 Corrosion Science and Technology Vol.22 No.4

The galvanostatic polarization technique was used to accelerate corrosion in high chromium cast iron (HCCI) immersed in a simulated slurry solution of 0.1 mol dm^-3 H₂SO₄, 0.05 mol dm^-3 HCl, and 10 wt% SiC. The HCCI contained 27 wt% of Cr and 2.8 wt% of C, and its microstructure mainly comprised austenitic and carbide phases. A two-electrode system using a dense carbon rod and the HCCI sample was employed for the galvanostatic polarization by applying an anodic current for 24 hours. The corrosion rate increased upon applying the anodic current, but the increase was not significant, particularly for current densities higher than 10 μA cm^-2. Following polarization, the corrosion morphology revealed that the anodic current accelerated surface corrosion in the HCCI; however while the depth of the corroded area increased, the increase was not substantial. The propagation behavior of the anodic current and its impact on corrosion were further discussed.

Two Level Rules for Mongolian Language

Chagnaa Altangerel,Baasanjav Adiyatseren 한국멀티미디어학회 2011 한국멀티미디어학회 국제학술대회 Vol.2011 No.-

Design and creation of two level rules, which works independently of the word forms for Mongolian language is described. This work updates previous works in Mongolian morphological analyzers in the sense of using generic notations for suffix allomorphs and most importantly in realizing Mongolian vowel harmony rule in two level rules.

산성 용액에서 전기화학적 특성과 침지 시간에 따른 고크롬 백주철의 부식 거동

이준섭 ( Jun-seob Lee ),바산자프오취개럴 ( Ochgerel Baasanjav ),오준석 ( Jun-seok Oh ),이재현 ( Je-hyun Lee ) 한국부식방식학회 2024 Corrosion Science and Technology Vol.23 No.4

The corrosion behavior of high chromium white cast iron was studied in 0.5 mol dm^-3 H₂SO₄ + 0.01 mol dm^-3 HCl solution over time through electrochemical and immersion experiments. Potentiodynamic and potentiostatic polarizations revealed active-passivation transition behavior, with critical current densities observed at -0.27 VSSE and 0.00 VSSE, repectively. The former potential showed preferential dissolution of primary γ phases, while the latter one showed preferential dissolution of eutectic γ phases. Immersion tests showed an exponential increase in corrosion rate, with significant acceleration observed around 1000 seconds due to the onset of eutectic γ phase dissolution. Over a 24-hour immersion period, both γ phases exhibited extensive corrosion, leaving carbides largely intact. These findings elucidate distinct corrosion behaviors of high chromium white cast iron in acidic environments, providing critical insights into material performance evaluation. Understanding these mechanisms is essential for predicting the longevity and durability of materials in corrosive conditions, thereby informing better material design and application strategies.

Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

Wan, Dao Yong,Fan, Zhi Yu,Dong, Yong Xiang,Baasanjav, Erdenebayar,Jun, Hang-Bae,Jin, Bo,Jin, En Mei,Jeong, Sang Mun Hindawi Limited 2018 Journal of nanomaterials Vol.2018 No.-

<P>NCA (LiNi0.85Co0.10Al0.05-<I>x</I> M<I>x</I>O2, M=Mn or Ti, <TEX>$ x$</TEX> < 0.01) cathode materials are prepared by a hydrothermal reaction at 170°C and doped with Mn and Ti to improve their electrochemical properties. The crystalline phases and morphologies of various NCA cathode materials are characterized by XRD, FE-SEM, and particle size distribution analysis. The CV, EIS, and galvanostatic charge/discharge test are employed to determine the electrochemical properties of the cathode materials. Mn and Ti doping resulted in cell volume expansion. This larger volume also improved the electrochemical properties of the cathode materials because Mn<SUP>4+</SUP> and Ti<SUP>4+</SUP> were introduced into the octahedral lattice space occupied by the Li-ions to expand the Li layer spacing and, thereby, improved the lithium diffusion kinetics. As a result, the NCA-Ti electrode exhibited superior performance with a high discharge capacity of 179.6 mAh g<SUP>−1</SUP> after the first cycle, almost 23 mAh g<SUP>−1</SUP> higher than that obtained with the undoped NCA electrode, and 166.7 mAh g<SUP>−1</SUP> after 30 cycles. A good coulombic efficiency of 88.6% for the NCA-Ti electrode is observed based on calculations in the first charge and discharge capacities. In addition, the NCA-Ti cathode material exhibited the best cycling stability of 93% up to 30 cycles.</P>