희유금속 비축 적정성 평가체계 수립

김유정,김대형,김진수,김주한,Kim, Yu-Jeong,Kim, Dae-Hyung,Kim, Jinsoo,Kim, Juhan 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.3

The import amount of rare metal in Korea is about 6,034 million USD, but the self-sufficiency of rare metals is about only 1%. In order to secure the stable supply of rare metals, it is necessary to operate an efficient stockpile system. In this study, we established a system to assess the adequacy of stockpiles by quantifying the risk factors of tangible and intangible risks in order to establish an efficient stockpile strategy. The model developed in this study aims to select the rare metals that need to be stockpiled first and to suggest the direction of the stockpiling policy in accordance with technological change and market change from the mid and long term viewpoint. The evaluation results derived from the model can quantitatively measure the security level of each rare metal and enable relative comparison between the rare metals using criticality matrix. Therefore, it is expected that more efficient stockpile policy will be possible if the proposed model is utilized in the future policy making.

DR콩고 루붐바시 슬래그재처리사업(再處理事業)의 경제성(經濟性) 평가(評價)

김유정,김대형,Kim, Yu-Jeong,Kim, Dae-Hyoung 한국자원리싸이클링학회 2012 資源 리싸이클링 Vol.21 No.1

콩고민주공회국(Democratic Republic of Congo, 이하 DR콩고)은 세계적 자원부국으로 특히 코발트, 철광석, 구리, 다이아몬드 등이 풍부하다. 주요 광물자원의 대부분을 수입에 의존하고 있는 한국은 2008년부터 콩고정부와 한국이 항만 건설을 지원하고, 그 보상으로 루붐바시 슬래그재처리를 통해 아연, 코발트, 구리 등 유용광물을 회수해가는 프로젝트에 대한 검토를 추진하여 왔다. 본 연구는 DR콩고의 루붐바시 슬래그 재처리 사업에 대한 경제성 분석을 수행한 것으로, 연구 결과에 따르면 투자회수기간(pay back period)은 6.7년, 순현재가치(NPV) 3,400만달러, 내부수익률(IRR)은 17.4%로 나타났다. 또한 세제, 고정비용, 운영비용, 지원가격 등에 대한 불확실성을 적용한 민감도 분석 결과 프로젝트의 순현재가치는 최저 -2,480만달러에서 최대 9,270만달러로 나타났다. One of the world's top resource-rich countries, the Democratic Republic of the Congo has ample reserves of cobalt, iron ore, copper and diamond in particular. Importing most of major mineral resources, the Republic of Korea has examined-together with the Congo government since 2008-the possibility of a project where it supports port construction in the Democratic Republic of the Congo and acquires useful minerals such as zinc, cobalt and copper in exchange through slag reprocessing in the local city of Lubumbashi. This study conducted feasibility analysis on the slag reprocessing project in Lubumbashi, Congo and found that the project's payback period stands at 6.7 years, net present value(NPV) at 34 million dollars and internal rate of return(IRR) at 17.4%. According to sensitivity analysis that takes into account uncertainties concerning taxation, fixed cost, operational cost and resource prices, the NPV of the project ranges from -24.8 million dollars to 92.7 million dollars.

모바일 기능성 게임 앱이 당뇨환자에게 미치는 효과에 대한 추적 조사 연구

김유정,Kim, Yu Jeong 한국게임학회 2018 한국게임학회 논문지 Vol.18 No.4

본 연구는 프로토타입 모델을 기반으로 모바일 기능성 게임 앱(롤리폴리 160앱)으로 개발한 후, 보건소에 내원하는 당뇨환자에게 사용하게 한 후 효과성을 추적 조사한 연구이다. 롤리폴리 160앱은 기존의 PC버전의 당뇨 자가관리용 기능성 콘텐츠인 '롤리폴리 160'을 G광역시의 유료화 서비스 요청에 의해 모바일 버전으로 업그레이드 한 것이다. 연구기간은 2018년 2월 19일부터 5월 11일까지였으며, 사용자는 사전조사 후 총 8주~12주 동안 매일 1회 이상 자유롭게 롤리폴리 160앱에 접속하여 당뇨 자가관리를 하였다. 연구결과, 롤리폴리 160앱을 8~12주간 사용한 사용자의 당화혈색소는 추적전보다 유의미하게 감소하였고(p=.04), 당뇨 지식은 추적전보다 통계적으로 유의하게 상승하였다(p=0.01). 롤리폴리 160앱을 적용한 후 전반적인 만족도는 5점 만점 중 3.74점으로 나타났다. This study was developed as a mobile serious game app (Roly Poly 160 App) based on a prototype model and then used in a public health center for diabetes patients. The mobile serious game application upgraded the mobile version of Roly Poly 160, which is a content for diabetes self-management of the existing PC version, by requesting to charge service of G city. The study period was from February 19, 2018 to May 11, 2018, and users were allowed to access the Roly Poly 160 app at least once a day for a total of 8 to 12 weeks after the preliminary investigation. As a result, HbA1C was significantly decreased(p=0.04), and diabetic knowledge was significantly higher than that before the follow-up(p=0.01). After applying Roly Poly 160 App, Satisfaction score was 3.74 out of 5 points

신·재생에너지 정책동향 및 지속가능한 분석

김유정,Kim, Yu-Jeong 과학기술정책연구원 2005 과학기술정책 Vol.- No.154

물질흐름분석을 이용한 국내 지속가능한 자원관리 시스템 모형 연구

김유정,김성용,허은녕,Kim, Yu-Jeong,Kim, Seong-Yong,Heo, Eun-Nyeong 대한자원환경지질학회 2008 자원환경지질 Vol.41 No.2

Sustainable resource management(SRM) is regarded as the core strategy to achieve Dematerialisation and Decoupling of economic growth from the use of natural resources and environmental degradation. This paper presents status SRM policy and research in worldwide, and analyzes decoupling of economic activity from energy consumption of domestic manufacturing, using decoupling factor. Also This paper suggests methodologies and strategies of SRM in Korea. SRM is established through various analysis and survey as following; forecasting of resource demand, material flow analysis and value chain analysis, resource market structure analysis. Through these analysis, we can obtain hot-spot and solution of environmental burden, recycling market management, recycling technology and best-optimal supply rate of primary and secondary resource. In Korea, resource management system must be linked with national and regional material flow analysis, and it is necessary to make SRM-law of national dimension for effective run of sustainable resource management system. 지속가능한 자원관리모형(SRM)구축은 탈물질화 및 환경과 경제의 디커플링을 이루기 위한 핵심적 요소로 여겨지고 있다. 본 연구에서는 세계 각국의 지속가능한 자원관리 정책 및 연구방향을 살펴보고, decoupling factor를 이용하여 국내제조업의 경제활동과 에너지소비간의 디커플링현상을 살펴보았다. 마지막으로 이를 바탕으로 국내 실정에 맞는 SRM모형구축과 전략을 제시하였다. 자원관리 시스템은 수요전망, 물질흐름분석과 가치사슬분석, 시장구조분석 등의 분석과 조사 등을 바탕으로 구축된다. 이러한 분석들을 통해 환경적 문제 해결, 재활용시장관리방안 및 시장의 구조적 문제점 도출, 필요 재활용기술 도출, 1차자원과 2차자원의 최적 공급비율 등의 Hot-spot 도출 및 해결방안모색이 가능하다. 또한 지속가능한 자원 관리시스템과 국가단위, 권역단위의 물질흐름분석을 유기적으로 연계하고, 효과적인 이의 운영을 위해서는 국가차원의 법제화와 뒷받침이 이뤄져야 할 것이다.

국내 희유금속 수급구조 분석 연구

김유정,이화석,Kim, Yu Jeong,Lee, Hwa Suk 한국자원리싸이클링학회 2014 資源 리싸이클링 Vol.23 No.3

본 연구는 35여종의 희유금속을 대상으로 광석(정광), 금속, 화합물, 스크랩 등 4개 유형으로 광종별 원재료를 범주화하고 교역 구조를 분석하였다. 우리나라 희유금속원재료 교역 규모는 점차 확대되어 교역 증가폭이 GDP 증가폭을 큰 폭으로 상회하고 있다. 희유금속 원재료는 실리콘, 니켈, 크롬, 몰리브덴, 망간 등 철강원료자원 위주로 수입이 주로 이루어지고 있으며 전자공업원료자원 중 인듐, 게르마늄 등은 총교역규모 1억불 이하의 작은 규모로 수입추이변화에 미치는 영향은 제한적이나 연간증가율이 20%를 상회하여 지속적인 수급관리가 필요하다. 수입규모는 수출규모의 약 3배이며 희유금속 원재료 수출입 유형은 국내산업구조 및 수요의 특성에 따라 광종별로 다양한 양상을 보이고 있으나 수입, 수출 모두 상당수가 금속형태로 교역이 이루어지고 있다. In this study, the domestic supply & demand of the raw materials of 35 rare metals was analyzed categorized as four types - ores, metals, compounds and scraps. Foreign trade volumes of the raw materials of rare metals have been steadily increased, furthermore, recently trade growth rate highly exceeds GDP. The raw materials of rare metals - silicon, nickel, molybdenum, manganese, etc. - for steel industry were the most big part of the raw materials of rare metals trade, while the raw materials of rare metals for electronics industry were imported relatively small volumes less than $100 million. However systematic supply & demand management on the raw materials of rare metals for electronics industry is needed since recently growth rate per year has been remarkably high over 20%. Import volumes were about three times bigger than export scale, and most of the raw materials of rare metals were traded as a metal form.

용액공정으로 제작한 PVP-IZO TFT의 UV-O₃ 처리를 통한 전기적 특성 향상 연구

김유정,정준교,박정현,정병준,이가원,Kim, Yu Jung,Jeong, Jun Kyo,Park, Jung Hyun,Jung, Byung Jun,Lee, Ga Won 한국반도체디스플레이기술학회 2017 반도체디스플레이기술학회지 Vol.16 No.2

In this paper, solution based Indium Zinc Oxide thin film transistors (IZO TFTs) were fabricated with PVP gate dielectric. To enhance the electrical properties, UV-O3 treatment is proposed on solution based IZO TFTs. The gate leakage current and interface trap density is compatible with conventional ZnO-based TFT with inorganic gate insulator. Especially, the UV-treated device shows improved electrical characteristics compared to the untreated device. These results can be explained by X-ray photoelectron spectroscopy (XPS) analysis, which shows that the oxygen vacancy of UV-O3 treatment is higher than that of no treatment.

접안렌즈를 이용한 범망막광응고술 후 발생한 눈꺼풀처짐에 대한 전향적 연구

김유정,임한웅,강민호,성민철,조희윤,Yu Jeong Kim,Han Woong Lim,Min Ho Kang,Min Cheol Seong,Hee Yoon Cho 대한안과학회 2013 대한안과학회지 Vol.54 No.7

Purpose: To investigate the possibility of blepharoptosis as a complication after panretinal photocoagulation using ophthalmoscopic contact lens. Methods: We prospectively evaluated patients who were diagnosed with diabetic retinopathy and scheduled to be treated with panretinal photocoagulation. Margin reflex distance 1 (MRD1), levator function, palpebral fissure height and width, and tarsal plate height were measured at the day of photocoagulation and 3 months after treatment. Results: MRD1 was decreased in 8 eyes (25.8%), levator function was decreased in 5 eyes (16.1%), and palpebral fissure height was decreased in 6 eyes (19.4%). The decrement of MRD1 and palpebral fissure height after photocoagulation were significant (p = 0.008, p = 0.031, respectively). There was a significant negative correlation between MRD1 decrement and tarsal plate height (p = 0.045). Conclusions: We identified blepharoptosis after panretinal photocoagulation using contact ophthalmoscopic lens, which was related with low tarsal plate height.

세계(世界) Critical materials 관리(管理)를 위한 전략(戰略)

김유정,Kim, Yu Jeong 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.5

수요확대가 전망되고 공급구조가 경직된 금속자원은 각국의 산업구조 및 자원확보 역량에 따라 리스크 관리가 필요하다. 이를 위해 금속자원의 위기성 평가가 다양화되고 있는데, 주로 희토류 등 희유금속이 위기물질 혹은 중요물질(Critical materials, Critical metal, Critical raw materials)로 선정되고 있다. 본 연구에서는 기술변화 및 수급불균형 등을 고려한 위기물질 선정체제 및 관리현황에 대해 살펴보고자 한다. 유럽, 미국 등은 신재생에너지 보급 확대에 따른 원재료 리스크를 평가하고 있으며, 일본은 자국 내 성장동력산업을 중심으로 핵심 원재료를 파악하고 있다. 영국은 자원채굴에 따른 환경부하를 고려하여 광종별 위기성을 평가하였다. 그리고 이러한 위기물질들의 가격시그널의 미약성, 비탄력적 공급구조, 기술변화에 민감한 수요변동성 등의 특징을 분석하였다. It is necessary to manage risk of metals which are has rigid supply structures and expected demand expansion, considering to industry structure and resource securing capacity of each country. Countries conducted various criticality analyses and selected mainly rare metals as critical materials(or Critical metals or Critical raw materials). This study examined cases of metals risk evaluation and management which are based on technology changes and imbalance supply-demand. EU and U.S.A evaluated risk on metals needed as supply expansion of renewable energy. Japan forecasted demand of rare metals needed in Japan's growth engine industry. U.K analyzed criticality of metals, considering environmental burden occurred from mining to refining. Critical materials has features such as weak price signal, inelastic supply structure, demand volatility in technology change.

성인 선천성 심장질환자의 신체상, 자아존중감 및 삶의 질에 관한 연구

김유정,김금순,Kim, Yu-Jeong,Kim, Keum-Soon 한국재활간호학회 2004 재활간호학회지 Vol.7 No.2

Purpose: This study was to investigate the degree of body image, self esteem and quality of life, to identify general and disease of characteristics on influencing this factors with the intention of providing basal data for developing nursing intervention to promote body image, self esteem and quality of life. Method: Subjects of this study were 91 grown-up congenital heart patients over 18 years in 2 tertiary hospitals. The data on body image, self esteem and quality of life were collected through questionnaire from March to April 2004. The data were analyzed by descriptive statistics, t-test, Pearson's correlation, ANOVA and tukey test using SAS for Windows 8.1 program. Result: 1) The mean scores of body image, self esteem and quality of life were 63.01, 25.29 and 496.79. 2) Body image was correlated with age(p=.0239), educational level(p=.0182), diagnosis(p=.0066), number of operation(p=.0148), cyanosis(p<.0001), complication(p=.0096) and NYHA level(p=.0378). 3) Self esteem was correlated with education level(p=.0026), economic level(p=.0240), number of operation(p=.0113) and cyanosis (p=.0006). 4) Quality of life was correlated with age(p=.0432) and diagnosis(p=.0020), number of operation (p=.0063), duration of last operation(p=.0225), cyanosis(p<.0001), complication(p=.0090) and NYHA level(p<.0001). 5) There was significantly positive relationship between body image, self esteem and quality of life. Subjects with more positive body image had higher self esteem(r=.7897, p<.05) and subjects with higher self esteem had higher quality of life(r=.6091, p<.05).