Phase Change Memory와 Capacitor-Less DRAM을 사용한 Unified Dual-Gate Phase Change RAM

김주연,Kim, Jooyeon 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.2

Dual-gate PCRAM which unify capacitor-less DRAM and NVM using a PCM instead of a typical SONOS flash memory is proposed as 1 transistor. $VO_2$ changes its phase between insulator and metal states by temperature and field. The front-gate and back-gate control NVM and DRAM, respectively. The feasibility of URAM is investigated through simulation using c-interpreter and finite element analysis. Threshold voltage of NVM is 0.5 V that is based on measured results from previous fabricated 1TPCM with $VO_2$. Current sensing margin of DRAM is 3 ${\mu}A$. PCM does not interfere with DRAM in the memory characteristics unlike SONOS NVM. This novel unified dual-gate PCRAM reported in this work has 1 transistor, a low RESET/SET voltage, a fast write/erase time and a small cell so that it could be suitable for future production of URAM.

도자예술의 새로운 테크닉을 통한 현대화 : 1980년대 이화여자대학교를 중심으로

김주연 ( Jooyeon Kim ) 이화여자대학교 도예연구소 2020 陶藝硏究 Vol.- No.29

Korean ceramic art college education began in 1958 at Ewha Womans University. In 1959, the Ceramics Research Institute of Ewha Womans University was established by Professor Hwang Jong-gu, and the Department of Ceramics and Crafts at the University of Fine Arts was newly established, and full-scale ceramics education at the university began. The university’s pottery education that began in this way changed from the traditional method to a more creative and contemporary ceramic art education after the professor who have studied abroad. The most notable change was the increase in casting lessons at each university at the start of the slip casting lessons at Ewha Womans University in the 1980s. For slip casting lessons It came to be expanded. In this study, we consider and organize the process of modernization that the slip casting education that appeared in the new technique of the 1980s brought to the pottery education of the university. It is necessary to look at the social background of the 1980s, confirm what kind of changes social changes have brought to university education, and consider the impact on Ewha Womans University. In particular, it is necessary to find out when and the subject name of the slip casting technique was shown in the modernization curriculum of Ewha Womans University department of ceramic art. Looking at the reason why the womans slip casting class was able to develop along with this, among the papers of Ewha Womans University General Graduate School and Special Graduate School, works using slip casting techniques and works that have been modernized through comparative analysis Study change. As a result of this research, we will organize the trend of modernization of university ceramics education brought about by the new technique of the 1980s, and connect this to see the change of university education brought about by the new technique of the present. Study the process of changing slip casting work as of the 2020s to another production method, and predict and discuss changes in contemporary ceramic art.

CVT내부의 조작계 부품으로 부터 발생하는 타음의 전달 메커니즘과 저감 방안에 대한 연구

김주연(Jooyeon Kim),김도형(Dohyung Kim),조흥식(Heungsik Cho) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11

CVT내부의 조작계 부품은 파킹과 레인지 전환의 역할을 담당하고 있으며, 레인지 전환시 플레이트와 디텐트 스프링에 의한 타음이 발생하고 있다. 특히 ATCR로 구동하는 ShBW 장착 차량(고급차)의 경우 시프트 노브를 인력으로 조작하는 것이 아니라, 실내의 버튼 터치에 의해 CVT에 부착된 ATCR가 강한 모터 힘으로 레인지 전환을 하고 있기 때문에 운전자가 조작력을 느끼며 시프트 레버를 조작하는 경우에 비해, 조작계 부품으로부터 발생하는 타음에 대한 더 까다로운 정숙성이 요구되고 있다. 본 연구에서는 CVT 내의 타음의 가진계로서 플레이트의 높이와 디텐트 스프링의 강성을 조정해 양쪽 부분품이 충돌시에 발생하는 충격량을 저감함으로써 타음 자체의 입력 크기를 줄인다. 전달계로서 조작계 부품 자체의 질량과 지지부의 강성을 조절해 가진계로부터의 충격량의 전달을 완화시켜 결론적으로 운전자가 느끼는 타음레벨을 저감할 수있는 조작계 구조에 대해서 제안한다.

파킹 기구 시스템의 래칫 거동 시 데미지 분석에 관한 연구

김주연(Jooyeon Kim) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6

Parking system is one of safety performance of automobile. If a driver operates P-stage while driving, a parking system can stop the vehicle through the mechanical lock. This scenario is a phenomenon in which parking gear and sprag are engaged. The speed of the vehicle at this moment is called the locked speed. However, if inserting P-stage at a higher speed than this speed, ratcheting behavior emerges before lock-up. Because many car makers conduct this behavior experiments with own test codes respectively, it is physically difficult to review all the conditions. To improve this problem, calculating the cumulative damage value for standardization with sum of impulse values by speed sections using a dynamic simulation result. The severity of ratcheting behavior can be determined using this value, verifying this method was conducted through experiments.

중국인 학습자의 한국어 모음 습득에 대한 제2언어 습득 모델 비교 연구

김주연(Kim, Jooyeon) 한국음성학회 2014 말소리와 음성과학 Vol.6 No.4

This study provided longitudinal examination of the Chinese learners’ acquisition of Korean vowels. Specifically, I examined the Chinese learners’ Korean monophthongs /i, e, ?, ?, a, u, o/ that were created at the time of 1 month and 12 months, tried to verify empirically how they learn by dealing with their mother tongue, and Korean vowels through dealing with pattern of the Perceptual Assimilation Model (henceforth PAM) of Best (Best, 1993; 1994; Best & Tyler, 2007) and the Speech Learning Model (henceforth SLM) of Flege (Flege, 1987; Bohn & Flege, 1992, Flege, 1995). As a result, most of the present results are shown to be similarly explained by the PAM and SLM, and the only discrepancy between these two models is found in the ‘similar’ category of sounds between the learners" native language and the target language. Specifically, the acquisition pattern of /u/ and /o/ in Korean is well accounted for the PAM, but not in the SLM. The SLM did not explain why the Chinese learners had difficulty in acquiring the Korean vowel /u/, because according to the SLM, the vowel /u/ in Chinese (the native language) is matched either to the vowel /u/ or /o/ in Korean (the target language). Namely, there is only a one-to-one matching relationship between the native language and the target language. In contrast, the Chinese learners" difficulty for the Korean vowel /u/ is well accounted for in the PAM in that the Chinese vowel /u/ is matched to the vowel pair /o, u/ in Korean, not the single vowel, /o/ or /u/.

중국인 학습자가 발음한 한국어 단모음에 대한 종단 연구

김주연(Kim, Jooyeon) 한국음성학회 2013 말소리와 음성과학 Vol.5 No.2

This study provided longitudinal examination of the Chinese learners’ acquisition of the Korean vowels. Specifically the author examined whether Korean monophthongs are acquired rapidly in early stages of learning (Flege, Munro and Skelton, 1992; Munro and Derwing, 2008) or they develop rather gradually in proportion to the learners’experience (Byee, 2001; Ellis, 2006). This study collected the Korean vowel production by 23 Chinese learners for a year, and then analysed F1 and F2 of each Korean vowel. The results showed that 1) Most of the second language (L2) vowels were rapidly improved during the first six or nine months of Korean learning before reaching the constant stage; and 2) The exact acquisition trajectories varied across the seven vowels. Specifically the vowels which were acquired in the early stage of learning were /i, e, ?/ for F1 and /?, e, o, u/ for F2. Thus this study supports the hypothesis of Flege et al. (1992) and Munro and Derwing (2008) except the fact that each vowel showed the different learning route.

중국인 학습자의 한국어 종성 지각에 대한 종단 연구

김주연(Kim, Jooyeon) 한국음성학회 2016 말소리와 음성과학 Vol.8 No.4

The purpose of this study aimed to examine the perceptual pattern of the Korean coda consonants by Chinese learners of Korean. Given that Mandarin allows only two nasals (/n, ŋ/) in the coda position, it was predicted that Chinese learners of Korean had difficulty in discriminating Korean coda consonants. In the experiment, the subjects were 21 beginner-level Chinese learners of Korean. They participated in the discrimination task four times a year in which they were asked to choose the right Korean coda consonants after listening the word from Korean native speakers. The results demonstrated that 1) Chinese learners of Korean improved their perception of the Korean coda consonants. 2) But Chinese learners of Korean performed differently according to the type of Korean coda consonants. Korean consonants /n, p, k, m/ showed significant differences, but /l, ŋ, t/ did not.

대칭성을 표현한 텍스타일 패턴 디자인 개발-보태니컬 아트를 활용하여-

김주연 ( Jooyeon Kim ) 서경대학교 디자인연구소 2019 디자인 이노베이션 연구 Vol.4 No.0

Recently, as the consumption tendency is diversified and personalized, high-sensitivity and high-performance textile products are being developed to satisfy consumer needs. When designing colors and patterns for textile products, we must create something that meets the needs of modern consumers. To do this, it is important to develop a highly sensitive textile design in which various formativeness is expressed. Under this proposition, the researcher explores the formative art of symmetry, one of the basic principles of formative art. In addition, based on the motif of 'botanical art', which is a plant drawing a long natural environment element, the study was based on the literature research and work production method needed to develop textile pattern design. The concepts and types of symmetry and botanical art were examined, and their applications in various fields were analyzed. To create a pattern with symmetrical formativeness and stability and aesthetics of botanical art, I make four pieces of hand-drawn and computer graphic design works and made it into a real product to check the possibility of uses of patterns. Through these studies, the following conclusions were drawn. First, symmetry is classified according to its shape and repetitiveness, studied in various fields, used constantly in the human environment, and holds historical and cultural characteristics. Botanical art, which began as a scholarly material, has developed since the 18th century and now has a meaning of art in itself and is used in various fields. Second, with regard to textile design, symmetry has important proportionality and symbolic characteristics to express art as a basic formative element related to production and it could present a highly sensitive textile design by expressing various colors with botanical art. In addition, the product was made with 'Digital Textile Printing (DTP)', an environmentally friendly process method, thus reducing environmental problems. Third, the pattern representing the studied symmetry is actually applicable to products such as in the field of fashion and accessories, and through the design that can stimulate the minimal and colorful modern emotion, it suggested the possibility of new concept and emotional textile design.

한국 고전에 나타난 기원(1) : 조선시대 궁중 상장례(喪葬禮)미술 속의 정치적 기원(祈願) -보(輔)와 화충(華蟲) 도상을 중심으로-

김주연 ( Jooyeon Kim ) 온지학회 2015 온지논총 Vol.- No.45

Ritual object, used for royal court funeral during Joseon dynasty, had specific icons graved such as axe and pheasant. These icons came from ancient Chinese classic text such as Book of Etiquette and Ceremonial, Book of Rites, Rites of Zhou and especially the axe played a role as a symbol of the royal authority. The ground for all ritual objects engraved with specific icon, is in line with the idea that death is also a series of life. This view comes from Confucianism and is a visionary form of ``etiquette to dress up corpse as if it was alive``.This idea started in China, however spread all over East Asia, but aggressively admitted in Joseon ritual art, where they persue ancient tradition. After its adaption, the objects and their use slightly changed from origin to suit Joseon``s condition. Scholars of Joseon explain the difference between China with diverse in corpse enshrine in casket and appellation of the ritual. Axe embroideries are often used in hearsecloth and related texts are shown in royal books. Also using pheasant decorated bier to carry the casket instead of dragon, pheasant, mountain, cloud and fire decorated wagon, is not an exotic act but to persue guidance from the elders and show legitimacy of the royal court, In other words, it the idea was used to keep the tradition at the same time. Royal authorities and the five virtues shown within the two icons, axe and pheasant, were to expose social status and identity of the dead. Even though their life on earth has ended, however their political contribution and will for their countries wealth and peace stayed with them and at the same time the desire for their last moment to ``stay magnificent like the first`` be kept.

가치기반수용모델(VAM)에 기초한 온라인 여행사 모바일 앱의 지각된 가치 및 수용의도에 관한 연구

김주연(Kim Jooyeon) 대한관광경영학회 2020 관광연구 Vol.35 No.5

The development of information and communication technology (ICT) has brought a big change in the travel industry. Especially, the emergence of online travel agencies (OTA) and the explosive increase of individual travelers have changed the existing offline market into a fully competitive market. Due to these environmental changes, the market boundaries between online and offline are rapidly breaking down in the travel market. In addition, the overall market trend in the tourism industry has been rapidly changed from offline to online, and research on online and mobile purchases has been actively conducted throughout all tourism areas. In this study, we would like to analyze what factors and features have a significant impact on consumers acceptance of mobile apps from online travel agencies, which are growing as one of the major technological trends. For this approach, we would like to comprehensively examine the causality between these variables by understanding how the benefits and sacrifices of mobile app users in online travel agencies affect perceived values and adoption intentions based on the VAM (Value-Based adoption Model). Through this, the purpose of this study is to suggest useful marketing strategies and implications for related companies in the future by clarifying the factors that users consider important in relation to the rapidly growing use of mobile apps in online travel agencies. Seven out of nine hypotheses proposed in this study were found to be significant, and usefulness, pleasure, and technical characteristics were identified as variables that affect perceived value and adoption intention. Also, perceived value was found to have a significant effect on adoption intention.