Feasibility Study of Methanesulfonic Acid (MSA), an Alternative Lixiviant to Improve Conventional Sulfuric Acid Leaching of NCM Black Mass

정혜원,이제승,송강훈,박민서,안준모,Hyewon Jung,Jeseung Lee,Ganghoon Song,Minseo Park,Junmo Ahn The Korean Institute of Resources Recycling 2024 資源 리싸이클링 Vol.33 No.1

Critical minerals such as nickel, cobalt and lithium, are known as materials for cathodic active materials of lithium ion batteries. The consumption of the minerals is expected to grow with increasing the demands of electric vehicles, resulting from carbon neutrality. Especially, the demand for LIB (lithium ion battery) recycling is expected to increase to meet the supply of nickel, cobalt and lithium for LIB. The recycling of EOL (end-of-life) LIB can be achieved by leaching EOL LIB using inorganic acid such as HCl, HNO₃ and H₂SO₄, which are regarded as hazardous materials. In the present study, the potential use of MSA (Methanesulfonic acid), as an alternative lixiviant replacing sulfuric acid was investigated. In addition, leaching behaviors of NCM black mass leaching with MSA was also investigated by studying various leaching factors such as chemical concentration, leaching time, pulp density (P/D) and temperatures. The leaching efficiency of nickel (Ni), cobalt (Co), lithium (Li), and manganese (Mn) from LIB was enhanced by increasing concentration of lixiviant and reductant, leaching time and temperature. The maximum leaching of the metals was above 99% at 80℃. In addition, MSA can replace sulfuric acid to recover Ni, Co, Li, Mn from NCM black mass.

한국어 단기 유학생의 학습자 변인이 말하기 숙달도 향상에 미치는 영향

정혜원 ( Jung Hyewon ),김영주 ( Kim Youngjoo ) 연세대학교 언어연구교육원 한국어학당 2019 외국어로서의 한국어교육 Vol.55 No.-

This study investigated effects of individual variables on speaking proficiency development of short-term study-abroad students in Korea. Forty-one learners were asked to complete a story recall task after watching a short Korean animation at the beginning and the end of the semester, and their responses were analyzed for syntactic development according to the CAF(Complexity, Accuracy, Fluency). This study also used self-reporting questionnaires to measure intercultural sensitivity, personality, and social networks. Results showed that although many participants achieved L2 gains in speaking proficiency on the whole during their study abroad, speaking complexity was meaningfully improved(p=.025) Specific subcategories of learners’variables that gave effect on improvement of speaking are as follows: I) Openness of personality had the most significant influence on improvement of speaking complexity(.589), ii) dispersion of social networks also had an effect on speaking complexity(.327), implying that the much interaction with Korean native speakers enhances Korean language learners‘ speaking complexity. (Kyung Hee University)

유니티를 이용한 안드로이드용 모바일 게임

정혜원(Hyewon Jung),김선정(Sunjeong Kim),송창근(Changgeun Song) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1

A Study on Interaction Method of EBook According to Reading path : Focusing on Wired Magazine'

Hyewon Jung(정혜원) 한국디자인학회 2010 한국디자인학회 학술발표대회 논문집 Vol.2010 No.10

Appearance of a device that has a form of tablet PC and characteristic of mobility is newly changing experience and behavior of humans who used to deliver and spend messages through various medium. This means a paradigm of new book that mixes a story structure of a book that can deliver information when or where transcending space time, entertainment factors of TV, and attribute of network and hypermedia that the web has had appeared. Moreover, use of touch interface, which is intuitive control method, and various sensors changed a communication form of focusing on text and image to the media that includes movement according to control of users and interaction with the device. Therefore, this study tried to find out change in way of reading in a space called book through change process of reading path that has flexible and dynamic structure in historical consideration of interface and linear, static structure. It was found that interface of papyrus scroll had made linear reading path and interface of codex page had made reading path that has fixity and integrity. And also the relationship of this interface and reading path had influence on reading path of hyperlinks of web, mobile and even 'Wired magazine' of 'iPad' that includes other media actively, and the reason it is changed to hypermedia reading path that includes interaction with users was affected from the precious interface. Advancing from cognizing new experience of reading, the study tried to help on writing that is suitable for new media and interaction method based on understanding of characteristics of device and text. This study is considered to have a significance in suggesting new direction of a book that has characteristics of entertainment, which can maximize fun for users or books in educational and practical fields that can let obtaining of information efficiently through synaesthetic experience.

20대 직장 여성을 위한 모바일 어플리케이션 'See & Talk'

정혜원(Hyewon Jung),류한영(HanYoung Ryoo) 한국HCI학회 2011 한국HCI학회 학술대회 Vol.2011 No.1

시저스 시스템을 적용한 파사드 디자인에 관한 연구

김승덕,정혜원,Kim, Seung-Deog,Jung, HyeWon 한국공간구조학회 2017 한국공간구조학회지 Vol.17 No.4

Recently, the interest in the smart buildings is increasing in the architecture field. Among them, a research of facade design using a transformable system that can adjust the effect of the external environment is in progress. One of a typical example of the deployable system is a Scissors system that can change shape by using the geometric conditions of a unit member. Scissors system is a high-tech structural system which can construct the deployable plan and curved space by using the SLE (Scissors-Like Element) consisted of two Bar and Pivot. If the facade is designed by applying Scissors system, it is possible to maximize the performance and aesthetic effect of the structure by using a shape change of the line member. This paper presents a study of deployable facade design applying hybrid-typed Scissors system. A new deployable pattern of facade design is developed by combining Angulated Scissors system and tessellation pattern. Applying the deployable pattern a double skin construction method which is to add an outer wall for design, it raises three dimensional effects and can maximize the artistic essence of the change in shape upon deployment.

충북지역 일부 대학생의 영양표시 활용 실태 및 과자류 1회 제공량 기준 영양표시 인지도

김미현,이연우,정혜원,Kim, Mi-Hyun,Lee, Yeon Woo,Jung, Hyewon 한국식품영양학회 2015 韓國食品營養學會誌 Vol.28 No.5

The study was carried out to investigate the efficacy of current nutrition labeling of processed foods and examine awareness among university students of nutrition information given current nutrition labels, and also awareness of the one-serving size of snacks that come in differently sized packages. A total of 100 students in Chungbuk, Korea participated in this study. About 60% of the subjects knew about nutrition labeling; however, a very small percentage (11%) of the subjects reported an experience of being educated about nutrition labeling. Also, just 32% of the students checked nutrition labels when they purchased processed foods. When understanding of nutrition information on labels of snacks in differently sized packaging was tested, over 80% of the subjects understood nutrition information accurately. Five different package sizes were studied. Of these 5, packages containing about 200% of one standard serving showed the highest rate of misunderstanding of total energy contents per container. Interestingly, the students most strongly preferred containers that contained 300% of one standard serving. From these results, we conclude that students consider the current recommendation for a serving size to be small, which may be related to misreading of nutrition labels of snacks that come in packages containing less than 300% of one standard serving size. To improve accurate understanding of nutrition labels of snacks, total package labels or dual column labels on packages containing less than 300% of one standard serving size should be considered.

청소년 사이버 언어폭력에 영향을 미치는 요인

박현수(Park, Hyunsoo),정혜원(Jung, Hyewon) 한국청소년정책연구원 2018 한국청소년연구 Vol.29 No.2

이 연구는 청소년 사이버 언어폭력의 변화유형에 영향을 미치는 요인을 살펴보고자 한다. 이를 위해 한국청소년패널조사 중학교 2학년 패널의 1~5차년도 자료를 활용하여, 준모수적 집단중심 모형(Semiparametric Group-Based Model)으로 분석하였다. 연구 결과를 살펴보면, 첫째로 사이버 언어폭력의 변화유형은 ‘무비행집단’, ‘증가-감소 집단’, ‘지속증가집단’의 3집단으로 분류되었다. 두 번째로 사이버 언어폭력을 저지르지 않은 집단과 저지른 집단으로 재분류하여 이들 간의 차이를 살펴본 결과, 자기통제가 낮을수록, 부정적 자아와 부모스트레스가 높을수록 사이버 언어폭력을 저지를 가능성이 높았다. 학교 요인 중에서는 선생님애착이 낮을수록 사이버 언어폭력을 저지를 가능성이 높았고, 학업 적응은 사이버 언어폭력에 유의한 영향을 미치고 있지 않았다. 성별은 부적으로 유의한 영향을 미치고 있어, 여자 청소년에 비해 남자 청소년일수록 사이버 언어폭력을 저지를 가능성이 더욱 높았다. 셋째로 사이버 언어폭력의 지속과 감소를 살펴보기 위해 변화집단 중에서 ‘증가-감소 집단’과 ‘지속 증가 집단’ 간의 차이를 살펴본 결과를 살펴보면. 3차년도와 5차년도에 전년 대비 부정적 자아에 대한 인식이 높아질수록 3차년도 이후에 지속적으로 사이버 언어폭력을 저지를 가능성이 더욱 높았다. 1차 년도의 외모 스트레스가 높을수록, 전년 대비 2차년도 외모 스트레스가 증가할수록 사이버 언어폭력이 지속되는 ‘지속 증가 집단’보다 ‘증가-감소 집단’에 속할 가능성이 높았다. 학교 요인 중에서 선생님 애착은 4차년도에서만 사이버 언어폭력의 지속에 부적으로 유의한 영향을 미치고 있었다. 학업 적응은 여러 시점에서 사이버 언어폭력의 지속에 유의한 영향을 미치고 있어, 사이버 언어폭력의 발생에 지속적인 영향을 미치는 요인으로 볼 수 있었다 이러한 결과를 토대로 본 연구의 시사점을 제시하였다. The objective of this study is to examine the factors affecting the types of changes in cyber verbal violence among adolescents. For the purposes of this study, we analyzed the Semi-parametric Group-Based Model using the 1st to 5th year data of the middle school 2<SUP>nd</SUP> grade panel of the Korean Youth Panel Survey. The results of this study are as follows. First of all, the types of cyber verbal violence were classified into three groups; “non-delinquent type”, “increasing-decreasing type”, and “consistently increasing type”. Secondly, the three groups were reclassified into two groups; the group that does not commit cyber verbal violence and the group that commits cyber verbal violence. As a result of examining the difference between the two groups, it was found that the lower the self-control, the more likely was it for a subject to be in the group that commits cyber verbal violence. Additionally, there is a bigger chance of engaging in cyber verbal violence if you are a person of high negative self esteem. In particular, parental stress was shown to statistically affect cyber verbal violence. Based on these results, the implications of this study are suggested.

An Adaptive Dead Reckoning Algorithm using Update Lifetime

SeokJong Yu(유석종),HyeWon Jung(정혜원),YoonChul Choy(최윤철) 한국멀티미디어학회 2000 한국멀티미디어학회 학술발표논문집 Vol.2000 No.1

멀티 플랫폼 기반 e-러닝 서비스를 위한 플랫폼 프로파일 분석기 설계 및 구현

임목화(MokHwa Lim),정혜원(HyeWon Jung),장병철(ByoungChol Chang),강수용(SooYong Kang),차재혁(JaeHyuk Cha) 한국멀티미디어학회 2004 한국멀티미디어학회 학술발표논문집 Vol.2004 No.2