Resistive switching characteristic of Ce0.9Y0.1O2/ TiO2 bi‑layer structure by photochemical metal‑organic deposition

Sung‑Eun Kim,Jin-Gyu Lee,In-Young Choi,Ha-Eun Kim,Hong-Sub Lee 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.1

Sneak current is one of the main bottlenecks for dense crossbar array resistive random access memory. This study reports highly non-linear resistive switching characteristic from Ce0.9Y0.1O2/ TiO2 bi-layer (1S/1R device) structure, fabricated by photochemical metal-organic deposition, as a solution for sneak current issue. Ce0.9Y0.1O2 material, possessing oxygen vacancies, was used as a potential barrier as well as oxygen reservoir which rectified the current of low resistance state without an electrical breakdown in 1S/1R device. TiO2 was adopted for resistive switching property, and TiO2 layer having mixed phase (anatase and brookite) showed typical diode switching behavior. The photochemical reaction of photochemical metal-organic deposition process and phase formation were monitored and established using by Fourier-transform infrared spectroscopy and X-ray diffraction, respectively. The 1S/1R device showed highly non-linear resistive switching characteristic, large on/ off ratio of above three orders of magnitude with low operating current.

Session 3 Distribution Science II

Lee,Sang-Yoon,Kim,Kyeung-Cho,Kim,Pan-Jin,Sun,Il-suck 한국유통과학회 2008 한국유통과학회 학술대회 논문집 Vol.2008 No.-

A Study of English Neologisms with Some Comparing Notes on Korean Neologisms

Lee Jin-sung 한국사회언어학회 2012 사회언어학 Vol.20 No.2

Lee Jin-sung. 2012. A Study of English Neologisms with Some Comparing Notes on Korean Neologisms. The Sociolinguistic Journal of Korea 20(2). pp. 367-400. This study examines how English is reflecting the changing society on neologisms, and how the language and the society is interwoven in neologisms of English. It also investigates English neologisms from the perspective of morphological formation and semantic change. In doing this Korean neologisms are partly dealt with comparatively to bring out the contrastive characters of the two languages. From the sociolinguistic point of view, the data were classified into three categories: society, life style, and people. These were further subdivided into several areas: general affairs, economics, IT new jobs, new technology under the category of society; language, daily lives, leisure, health, food, and apparel under the life style; men and women, men, women, youngsters and the olds under the people. It was found that the categorial classifications of neologisms reveals how social change is reflected on neologisms of each language, and also discloses the way the two languages enrich their expressive power. From the perspective of morphological formation and semantic change, the English data were classified into compounds, new words, verbal phrases, and independent expressions. The compounds were subdivided into simple compounds and compounds within compounds to diagnose the degree of recursive character in English. In the category of new words, the followings were investigated: affixations, blendings, abbreviations, acronyms, euphemisms, semantic shifts, foreign languages, functional shifts, coinages and clippings. The distribution of neologisms in regard to their parts of speech was also examined. In comparing notes of the two languages, the followings are provided: first, sociocultural character reflected on neologisms; second, the frequencies and characterizations of neologisms from morphological perspectives; third, the distribution of parts of speech.

Tuberculosis risk is associated with genetic polymorphisms in the LRP2, CUBN, and VDR genes

Sung‑Soo Kim,Sang In Lee,Hyun‑Seok Jin,Sangjung Park 한국유전학회 2020 Genes & Genomics Vol.42 No.10

Background Vitamin D (Vit. D) is used extensively during tuberculosis treatment. Low levels of serum Vit. D increase the risk of active tuberculosis development. Altered expression of the proteins involved in Vit. D metabolism impairs cathelicidin production, thereby increasing the host susceptibility to tuberculosis. Objective We are trying to investigate whether single nucleotide polymorphisms (SNPs) in LRP2, CUBN, and VDR genes could afect tuberculosis development. Methods We included participants of the Korean Association Resource (KARE), part of the Korean Genome and Epidemiology Study (KoGES), and used their recorded data. A total of 8840 people (4182 men and 4658 women) were eligible subjects. The 5-kb regions from the ends of transcripts of GC, LRP2, CUBN, and VDR genes were amplifed to select 13, 47, 70, and 15 SNPs, respectively. For association analysis and statistical analysis, PLINK version 1.07 and PASW Statistics version 18.0 were used. Results Signifcant correlation was observed in 11, 2, and 1 SNPs in LRP2, CUBN, and VDR genes. The efect of rs6747692 of LRP2 on transcription factor binding was confrmed using RegulomeDB. We confrmed that rs2239182 of VDR is located in the genomic eQTL region and can afect transcription factor binding and gene expression. Conclusions Genetic polymorphisms in genes encoding proteins involved in Vit. D metabolism infuence immune system components. Therefore, such polymorphisms may infuence the susceptibility to Mycobacterium tuberculosis invasion and alter the defense mechanisms against Mycobacterium tuberculosis infection. The correlation between genetic variation and tuberculosis development can provide new guidelines for the management of tuberculosis.

Magnetization Analysis for Outer Rotor Brushless DC Motors Using Polar Anisotropic Ferrite Ring Magnets

Sung‑Il Kim,Su‑Jin Lee,Jeong‑Jong Lee,Chang‑Eob Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

Ferrite-bonded magnets have been extensively used in small brushless DC (BLDC) motors for low torque applications such as fans and pumps. In particular, some motors of them with ferrite-bonded magnets, frequently called as plastic magnets, do not have a rotor core in order to reduce manufacturing costs and inertia of the rotating part. Accordingly, the magnetization distribution of the bonded magnets has a polar anisotropic direction to secure more magnetic fux. As a result, the magnetization orientation of the magnets is highly signifcant to accurately predict the performances of the BLDC motors. This paper deals with the magnetization analysis of the polar anisotropic ferrite ring magnet applied to an outer rotor type BLDC motor. The motor is employed for an electric water pump, and its rotor including the impeller consists of only the ferrite-bonded magnet material and made by injection molding. Consequently, a magnetizing fxture and an impulse magnetizer are not used for the magnetization of the outer rotor type motor. Instead, samarium–cobalt (SmCo) magnets having a relatively high curie temperature are applied for generating magnetic feld. Finally, this paper presents a process to determine the anisotropic orientations of a ferrite ring magnet by fnite element method. In addition, the validity of the analysis method is verifed by test results

Robust Control of Robot Manipulators Using Inclusive and Enhanced Time Delay Control

Jin, Maolin,Kang, Sang Hoon,Chang, Pyung Hun,Lee, Jinoh Institute of Electrical and Electronics Engineers 2017 IEEE/ASME Transactions on Mechatronics Vol. No.

<P>Thanks to its simplicity and robustness, time delay control (TDC) has been recognized as a simple and yet effective alternative to robot model-based controls and/or intelligent controls. An inclusive and enhanced formulation of TDC for robust control of robot manipulators is presented in this paper. The proposed formulation consists of three intuitive terms: 1) time delay estimation (TDE), inherited from the original TDC, for cancellation of mostly continuous nonlinearities; 2) nonlinear desired error dynamics (DED) (i.e., a 'mass'-'nonlinear damper'-'nonlinear spring' system) injection term; and 3) a TDE error correction term based on a nonlinear sliding surface. The proposed TDC formulation has an inclusive structure. Depending on the gain/parameter set chosen, the proposed formulation can become Hsia's formulation, Jin's formulations including a type of terminal sliding mode control (SMC), an SMC with a switching signum function, or a novel enhanced formulation. Experimental comparisons were made using a programmable universal manipulator for assembly-type robot manipulator with various parameter sets for the proposed control. Among them, the highest position tracking accuracy was obtained by using a terminal sliding DED with a terminal sliding correction term.</P>

Differential Manifestation of Ocular Phenotypes in TALEN-mediated p19arf Knockout FVB/N and C57BL/6J mouse lines

Jin‑Sung Park,Joo‑Il Kim,Hyun‑Jin Lim,Soo‑Kyung Ryu,Euna Kwon,Kang‑Min Han,Ki‑Taek Nam,Han‑Woong Lee,Byeong‑Cheol Kang 한국유전학회 2020 Genes & Genomics Vol.42 No.9

Background p19arf, primarily known as a tumor suppressor, has also been reported to play an essential role in normal development of mouse eyes. Consistently, lack of p19arf has been associated with ocular defects, but the mixed background of the knockout (KO) mouse strain used raised a concern on the accuracy of the phenotypes observed in association with the targeted gene due to genetic heterogeneity. Object We carried out a study to investigate into the efect of genetic background on the manifestation of p19arf KO associated phenotypes. Methods We characterized the phenotypes of novel p19arf KO mouse lines generated in FVB/N and C57BL/6J using a transcription activator-like efector nuclease (TALEN) system in comparison to the reported phenotypes of three other p19arf-defcient mouse lines generated using homologous recombination. Results Ninety-fve percent of FVB/N-p19arf KO mice showed ocular opacity from week 4 after birth which worsened rapidly until week 6, while such abnormality was absent in C57BL/6J-p19arf KO mice up to the age of 26 weeks. Histopathological analysis revealed retrolental masses and dysplasia in the retinal layer in FVB/N-p19arf KO mice from week 4. Besides these, both strains developed normally from birth to week 26 without increased tumorigenesis except for a subcutaneous tumor found in a C57BL/6J-p19arf KO mouse. Conclusion Our fndings demonstrated surprisingly variable manifestation of p19arf-linked phenotypes between FVB/N and C57BL/6J mice, and furthermore between our mouse lines and the established lines, indicating a critical impact of genetic background on functional study of genes using gene targeting strategies in mice.

입력전류 파형 개선형 단상 정류기의 토폴로지

이상현(Sang-Hyun Lee),박진민(Jin-Min Park),문상필(Sang-Pil Mun),서기영(Ki-Young Suh) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-

For small capacity rectifier circuits such as these for consumer electronics and appliances, capacitor input type rectifier circuits are generally used. Consequently, various harmonics generated within the power system become a serious problem. Various studies of this effect have been presented previously. However, most of these employ switching devices, such as FETs and the like. The absence of switching devices makes systems more tolerant to over-load, and brings low radio noise benefits. We propose a power factor correction scheme using a LC resonant in commercial frequency without switching devices. In this method, it makes a sinusoidal wave by widening conduction period using the current resonance in commercial frequency, Hence the harmonic characteristics can be significantly improved, where the lower order harmonics, such as the fifth and seventh order are much reduced. The result are confirmed by the theoretical and experiment implementations.

성과측정시스템의 상호작용적 이용, 심리적 임파워먼트, 창의성 및 경영성과간의 관계

이성진(Lee, Sung-Jin),박경원(Park, Kyong-Won) 한국경영교육학회 2020 경영교육연구 Vol.35 No.4

[연구목적] 창의성은 조직의 역량을 혁신하는데 있어 필수적인 요소이며, 조직에서 관리통제시스템은 창의성을 향상시키거나 제약하는데 이용될 수 있다. 본 연구의 목적은 성과측정시스템(PMS)의 상호작용적 이용이 창의성 창출에 어떻게 연관되어 있는지를 검증하고자 한다. 또한 심리적 임파워먼트와 창의성간의 연관성을 확인하고, 경영성과의 개선에 미치는 영향도 확인하고자 한다. [연구방법] 본 연구는 KOSPI에 상장되어 있는 제조기업의 중간관리자로부터 수집한 설문자료를 이용하여 PMS 상호작용적 이용에 대한 인식을 확인하고 그에 따른 심리적 임파워먼트와 창의성에 미치는 영향을 지지하는 실증적인 증거를 제공한다. 연구가설은 PLS 구조방정식 모형을 이용하여 검증하였다. [연구결과] 분석결과, PMS의 상호작용적 이용은 심리적 임파워먼트뿐만 아니라 창의성의 창출에도 영향을 미치는 것으로 나타나서, MCS의 상호작용적 이용은 창의성을 관리하는데 도움을 준다는 이론을 지지하는 것으로 나타났다. 또한 심리적 임파워먼트와 창의성은 연관성이 높은 것으로 나타났다. 심리적 임파워먼트와 창의성은 경영성과를 개선하는 것으로 나타났다. [연구의 시사점] 본 연구는 심리적 임파워먼트가 창의성과 어떻게 연관되어 있는지에 대한 이해를 제공하고, PMS의 상호작용적 이용이 창의성 창출로 이어질 수 있는 방법에 대한 증거를 제시함으로써 관리회계연구에 기여한다. [Purpose] Creativity as a success factor is greatly importance to secure competitive advantage and improve business performance. Depending on how senior manager uses PMS, there will be a distinction in the feeling of psychological empowerment by the organization members, which will affect the creation of creativity, and result in a difference in business performance. [Methodology] Questionnaires were distributed to the manufacturing firms listed on KOSPI, of which 85 of the survey data available were utilized for the analysis. This study use PLS(partial least squares) structural equation modeling to analyze empirically hypotheses. [Findings] The interactive use of PMS has been shown to have a positive effect on psychological empowerment and creativity. It was also shown that psychological empowerment had a significant influence on creativity, and that two concepts had a significant influence on business performance. [Implications] This study has empirically verified that psychological empowerment and creativity have a positive effect on business performance. The interactive use of PMS by senior manager enhances the psychological empowerment of the members and may improve business performance by forming conditions in which creativity can be created.

일학습병행에서 학습기업의 재참여 의사에 미치는 영향 요인 탐색

조한진(Jo, Han-Jin),이선화(Lee, Seon-Hwa),박종성(Park, Jong-Sung) 한국경영교육학회 2020 경영교육연구 Vol.35 No.2

[연구목적] 기존 일학습병행에 참여한 학습기업의 재참여 활성화 방안에 앞서 학습기업의 재참여에 미치는 영향 요인을 구명하여, 학습기업 재참여 활성화 방안에 정책적 기초자료를 제공하는 것이다. [연구방법] 독립변수는 총 11개로 범주형 4문항과 연속형 7문항으로 구성되어 있고, 종속변수는 범주형 1문항으로 구성되어 이분형 로지스틱 회귀분석을 적용하였다. [연구결과] 전체적으로 학습기업의 재참여 의사에 영향을 미치는 요인은 참여 동기, 일학습병행 전반적인 만족, 현장훈련 시간 단축 필요성, 기업현장교사 양성교육 기간 적절성, 일학습병행 훈련과정 종료 후 유지 계획 유무, 참여유형의 6가지 변수로 나타났다. 참여유형을 재직자단계와 재학생단계로 나누어 분석한 결과는 다음과 같다. 첫째, 재직자단계에서 학습기업의 재참여 의사에 영향을 미치는 요인은 참여 동기, 일학습병행 전반적인 만족, 현장훈련 시간 단축 필요성, 기업현장교사 양성교육 기간 적절성, 일학습병행 훈련과정 종료 후 유지 계획 유무의 5가지로 나타났다. 둘째, 재직자단계에서 학습기업의 재참여 의사에 영향을 미치는 요인은 참여 동기, 학습기업 선정 절차 적절성, 학습기업 선정기준 적절성, 일학습병행 전반적인 만족, 일학습병행 훈련과정 종료 후 유지계획 유무의 5가지로 나타났다. [연구의 시사점] 일학습병행의 내실화를 위하여 학습기업의 재참여 활성화 방안을 위한 정책적 시사점을 제공하였다. [Purpose] The purpose of this study is to examine the factors affecting re- participation of companies involved in apprenticeship before the revitalization of re-participation and to provide basic policy data to revitalize re-participation of companies involved in apprenticeship. [Methodology] There were 11 independent variables comprising four questions for categorical variables and seven questions for continuous variables. One dependent variable comprised one question for a categorical variable. The binomial logistic regression analysis was applied. [Findings] The factors affecting re-participation intention of companies involved in apprenticeship were six variables, including the motivation to participate, overall satisfaction about apprenticeship, need for the shortened time of on-the- job training, appropriate training period of in-company trainers, plan to maintain apprenticeship after the end of the training process, and participation type. The results of analyzing participation type First, there were five factors affecting re-participation intention of companies involved in the apprenticeship for students, including the motivation to participate, overall satisfaction about apprenticeship, need for the shortened time of on-the-job training, appropriate training period of in-company trainers, and plan to maintain apprenticeship after the end of the training process. Second, there were five factors affecting re-participation intention of companies involved in the apprenticeship for new workers, including the motivation to participate, appropriate procedure for selecting companies involved in apprenticeship, appropriate criteria for selecting companies involved in apprenticeship, overall satisfaction about apprenticeship, and plan to maintain apprenticeship after the end of the training process. [Implications] Policy implications were presented to substantialize apprenticeship and to revitalize re-participation of companies involved in apprenticeship.