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.

자동차 조작계용 판스프링의 내구수명 검토 기법에 관한 연구

김주연(Jooyeon Kim),정우현(Woohyeon Jeong),서희수(Heesoo Seo) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5

Almost vehicles have parking systems that function to set safety devices and driving modes, which exist in the form of gear knobs, button types, and rotation types. Here, the driving mode is familiar with the form of P-R-N-D-S, and recently, it has changed into a simple system of P-Not P mode. This can be expressed as a shift by wire (SBW) type that operates the gear knob with a human hand (SBC: Shift By Conventional type), and the mechanical principle driven by each range is the same. This system is designed to prevent the sprag from rotating the gear when the parking gear is stopped (P), and the sprag must be released from the gear to drive the vehicle when driving or reversing (D or R). In addition, parking on ramps requires more force than flat ground, so it has been calculated through design sheets or multibody dynamics analysis to calculate the force required to operate this system. In order to check various designs, it is difficult to respond through the simulation of a parking system using a rigid body in order to review the life of a flat spring mounted on the operating system. In this paper, a method of predicting fatigue life was presented through test and flexible body dynamics analysis (Ansys motion) to expect the flat spring durability of the operating system during the initial layout design stage of the new parking system to improve this problem.

‘주름’이론을 통한 도자 조형화 연구

김주연 ( Kim Jooyeon ) 이화여자대학교 도예연구소 2017 陶藝硏究 Vol.- No.26

Material and technique, clay and firing, have long been considered the central elements in the creation of ceramic works. However, their manipulation features a great number of constraints and limitations. Therefore, the ceramic arts continues to depend on traditional methods for shaping and decoration. In particular, due to the requirements of firing, ceramic objects must be capable of withstanding the heat inside the kiln and are usually created in a closed form. This research begins with a critical insight into these technical constraints. It focuses on developing novel means to model ceramics works, such as opening closed forms or diversifying decoration methods. In this research, I focused on the potential of “folds” embedded in materials, which make it possible to overcome a number of technical constraints. Here I investigated ways to diversify folds. First of all, I examined theories about folds through Leibniz’s and Deleuze’s writing, and discussed the properties of these folds. Based on these theories, I conducted experiments with materials and types of folds through my own work. In addition, I analyzed and demonstrated the several steps in producing folds, including description (from the expansion of organic lines), materialization, and individualization (to express artistic sensibility). Through this research, I have propelled folds, which had been used simply for ornamenting the surface of ceramic artworks, into an independent form. I also found that an individualized fold used in ceramics can transform a closed form into an open one (from a concept of mass to one of volume) for the structure of ceramic works. Lastly, I suggested a method for enjoying the natural and organic form of ceramic works by firing a clay body into which has been incorporated other materials.

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.

신고전적 현실주의로 본 미국의 북한 테러지원국 해제 결정과정

김주연 ( Jooyeon Kim ),신욱희 ( Wookhee Shin ) 서울대학교 한국정치연구소 2015 한국정치연구 Vol.24 No.2

The United States and North Korea had been in a tedious tug-of-war over the inclusion of North Korea in the State Sponsors of Terrorism list, until the Bush administration, in October 2008, officially delisted the country. Considering how conservative and aggressive the policy on North Korea was during the first term of the Bush administration, Bush’s decision to withdraw North Korea from the list was remarkable. This paper, by tracing down the decision-making process, its structure, and participants, aims to search for the determinants of the Bush administration’s decision. In the theoretical framework of Neoclassical Realism, it will analyze the case through two variables, Bush administration’s political power and decision-makers’ perceptions. First, a localized and exclusive decision-making process granted the Bush administration strong political power. Second, within such distinctive decision-making process, Assistant Secretary of State for East Asian and Pacific Affairs Christopher Hill``s moderate and conciliatory perception on North Korea substantially contributed to the final decision to remove North Korea from the terrorism list.