상악 전치부 잔존 유치와 매복 견치 발치 후 즉시 임플란트 식립: 증례 보고

유지연,김여갑,이백수,권용대,최병준,김영란,백진,Yoo, Ji-Yeon,Kim, Yeo-Gab,Lee, Baek-Soo,Kwon, Yong-Dae,Choi, Byung-Joon,Kim, Young-Ran,Baek, Jin 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.4

Alveolar bone resorption after extraction impairs the necessary bone volume and complicates the case for implant surgery and aesthetic implant prosthesis. Immediate implant surgery after extraction decreases the number of surgical procedures and the duration of treatment, while allowing minimum alveolar bone resorption and preserving the residual bone volume. Although immediate implant holds many advantages such as preservation of hard and soft tissue around the extraction socket, greater implant survival rate and higher patient satisfaction, various complications and high failure rate are discouraging factors for the clinicians. In this case report, severe alveolar bone resorption with soft tissue changes were predicted after the extraction of prolonged retained deciduous incisors and impacted maxillary canines and thus decided on immediate implant procedure. Immediate implant surgery after extraction was carried out with minimal bone reduction and tapered wide-neck implant to establish initial stability. Simultaneous bone graft was done by filling the defect area with iliac cancellous bone with additional onlay-type bone graft and absorbable membrane on the labial bone for upper lip support. A stable and esthetic result was obtained with shortened treatment period.

현대한복 착용의 국내외 반응에 대한 텍스트 마이닝 분석

유지연(Yoo Ji-Yeon),장민정(Chang Min-Jung) 한복문화학회 2021 韓服文化 Vol.24 No.3

As the popularity of Hallyu content at domestic and global has increased day by day, interest in Hanbok seen on dramas, movies and K-pop stages has also increased. However, compared to the high popularity of the Korean Wave, there is a lack of research on domestic and foreign responses to modern clothing shown in the Korean Wave culture. Therefore, collecting domestic and foreign responses to each case, emotional analysis was carried out, which aims to identify domestic and foreign responses to the wearing of modern Hanbok in the Korean Wave culture. The responses of the comments were analyzed using text mining in two ways: positive and negative responses were examined through Wordcloud, which lists key words in frequency order, followed by reading and analyzing the actual comments by reaction. The results of the research analyzed through these methods are as follows. Through these results, we wanted to compare and analyze the domestic and global responses to modern Hanbok shown in Korean Wave culture and the domestic and global responses to the wearing of modern Hanbok by ordinary peaple. Through this, we want to provide basic data on how to globalize Hanbok.

선도기업과 후발기업의 연구개발 투자가 미래수익성과 미래이익변동성에 미치는 영향 : 저기술 산업을 중심으로

유지연(Ji-Yeon Yoo) 한국국제회계학회 2020 국제회계연구 Vol.0 No.92

본 연구는 기업의 연구개발 투자가 미래수익성과 이익변동성에 미치는 영향을 검증한다. 연구개발 투자의 영향은 투자의 목적에 따라 다르게 나타날 수 있다. 이에 본 연구에서는 연구개발 투자의 목적을 혁신 연구개발과 모방 연구개발로 나누어 차별적인 영향을 분석하였다. 1995년부터 2018년 한국거래소 유가증권시장(KOSPI)에 상장되고 연구개발비 지출이 이루어진 자료를 바탕으로 분석하였다. 연구개발 투자가 가지는 시차성으로 인해 미래 수익성은 t+1기부터 t+3기의 총자산수익률을 사용하여 측정하였다. 또한 이익변동성과 연구개발 투자의 관계에 대한 차별적 영향을 검증하기 위해서 Kothari et al.(2002)의 연구에서 사용된 식을 변형하여 측정하였다. 분석결과 저기술 산업에서 기업의 연구개발 투자는 선도기업의 혁신의 연구개발 보다 후발기업의 모방의 연구개발일 때 미래수익성에 더 긍정적인 영향을 나타냈다. 이는 저기술 산업은 혁신적인 기술 개발보다 이미 개발된 제품이나 기술의 모방을 통한 효율적 운영이 기업의 수익성에 긍정적인 영향을 준 것이라 생각된다. 또한 선도기업의 혁신의 연구개발 투자가 후발기업의 모방의 연구개발 투자에 비해 이익변동성이 큰 것으로 나타났다. 이는 혁신의 경우 처음 시도하는 연구개발이므로 그만큼 불확실성이 높기 때문으로 해석된다. 상기의 결과를 토대로 연구개발 투자의 목적에 따른 미래수익성과 불확실성의 차이를 알 수 있다. 이에 기업의 연구개발 투자 전략에 있어 기업의 상황 및 연구개발 투자의 목적에 따른 적절한 연구개발 투자가 이루어질 수 있을 것이라 기대된다. This study shows thorough examination on the correlation between R&D expenditure and firm profitability and earnings volatility over the low technology industry. The impact of R&D investment can vary depending on the purpose of the investment. Therefore, in this study, the purpose of R&D investment was divided into innovative R&D and imitation R&D to analyze the discriminating effects. Based on the data listed on the Korea Exchange Securities Market (KOSPI) from 1995 to 2018 and spending R&D expenses. Due to the time lag of R&D investments, future profitability was measured using total asset returns from t+1 to t+3. In addition, in order to verify the differential effect on the relationship between earnings volatility and R&D investment, the formula used in the study of Kothari et al.(2002) was modified and measured. As a result of the analysis, in the low-tech industry, investment in R&D of companies showed a more positive effect on future profitability when research and development of imitation of followers than R&D of innovation of leaders. It is thought that the low-tech industry has a positive effect on the profitability of the company through efficient imitation of already developed products or technologies rather than innovative technology development. In addition, it has been found that the R&D investment of innovation of leading companies is greater than that of the imitation R&D investment of followers. This is interpreted as an uncertainty as it is the first attempted R&D in the case of innovation. Based on the above results, it is possible to know the difference between future profitability and uncertainty depending on the purpose of R&D investment.

지연 수술로 호전된 간문맥 내 가스와 장관 기종을 동반한 괴사성 장염

유지연 ( Ji Yeon Yoo ),유영욱 ( Young Wook Yoo ),김지혜 ( Ji Hye Kim ),유상훈 ( Sang Hoon Yoo ),하소영 ( So Young Ha ) 영남대학교 의과대학 2015 Journal of Yeungnam Medical Science Vol.32 No.1

Portal vein gas and pneumatosis cystoides intestinalis are uncommon conditions and have been associated with poor prognosis. They are most commonly caused by necrotizing enterocolitis but may have other causes, and they can be associated with necrotizing and ischemic colitis, intra-abdominal abscess, small bowel obstruction, diverticulitis, colon cancer, and acute pancreatitis. With the more frequent use of computed tomography (CT) scans, portal vein gas and pneumatosis cystoides intestinalis have been increasingly detected in recent years. Because of its high mortality rate, necrotizing enteritis with portal vein gas and pneumatosis cystoides intestinalis may be treated with emergent exploratory laparotomy. We report a case of necrotizing enteritis with portal vein gas and pneumatosis cystoides intestinalis in a 47-year-old man treated with intensive medical management and delayed operation due to unstable condition and surgical mortality. He had good clinical results without complications after the delayed operation.

가상자산 범죄에 있어서 자산 동결 제도 도입 제안

유지연(Ji Yeon Yoo),김기윤(Kieyoon Kim) 대검찰청 2022 형사법의 신동향 Vol.- No.75

본 글에서는 가상자산 범죄에 효과적으로 대응하는 수사 방법 및 피해 구제수단으로서 자산 동결 제도 도입이 필요함을 논의하였다. 가상자산은 거래의 익명성 및 탈중앙화로 인하여 한번 도난 당하면 추적하여 찾기가쉽지 않다. 따라서 가상자산 범죄에 효과적으로 대응하기 위하여는 수사 초기 단계에서부터 신속하게 자산을 동결하는 것이 필요하다. 현재 입법화된 자산 동결 제도로서 전기통신금융사기피해방지및피해금환급에관한특별법에 지급정지가 규정이 있다. 본 글에서는 보이스피싱 범죄에 대한 대응수단으로 규정된 지급정지 제도를 구체적으로 검토한 후, 이를 가상자산 범죄 특성에 맞게 변형하여 적용할 수 있는 방안을 제시하였다. 나아가 본 글에서는 미국이 ‘바나나펀드(Banana Fund)'라고 불리우는 폰지 사기 조직에동원된 전자 지갑을 압수한 후 대물 민사 판결을 청구한 사례를 검토 하였다. 이 사건에서범죄자가 자국 내에 있지 않았고 형사기소 되지 않았음에도 불구하고, 수사기관은 민사몰수 청구를 통해 피해 자산이 유출되는 것을 막을 수 있었다. 민사몰수는 다수 피해자가연관된 폰지 사기 사건에 있어서 피해자 보호를 위한 효과적인 기능을 하므로 장기적으로는 우리나라도 이를 도입하는 것이 바람직하다. 그러나 법체계의 차이로 인하여 우리나라에 민사몰수를 도입하려면 상당한 시일이 걸릴 것이다. 따라서 당장 급증하는가상자산 범죄에 대응하기 위하여 자산 동결 제도를 도입하는 것이 법체계 충돌을 피하는 더 현실적인 방법이다. 자산 동결은 피해자 입장에서는 피해구제 신청으로 피해금을 반환 받을 수 있는 민사적인 구제기능을 한다. 또한 법원이 발부한 압수・수색영장 없이 수사기관이 곧바로압수 및 몰수하는 것과 다름없는 효과를 가져온다. 따라서 재산권 침해를 최소한으로하고 부작용을 줄이기 위한 제도적 장치가 필요하다. 이러한 장치로서 이해관계인으로부터 이의신청이 들어오면 법원이 영장집행에 대한 항고사건을 처리하듯 심사하는것이 바람직하다. Currently, discussions are being made on the establishment of a ‘Digital asset basic law', such as the preparation of regulations on issuers related to virtual assets and the prohibition of unfair trade. At this point in time, in light of the characteristics of virtual asset-related crimes, this article discusses the need to introduce an asset freezing system that can freeze criminal proceeds at the initial stage of an investigation. We analyzed the properties of cryptocurrencies such as Bitcoin, stablecoins, and NFTs. Due to the decentralization, internationality, and anonymity of virtual assets, it is almost impossible to receive criminal proceeds after money laundering. Therefore, there is a need for a system that can freeze funds from the early stage of the investigation for thorough recovery of criminal proceeds and protection of victims. As a similar system, in the case of ‘voice phishing’, a system that can suspend payment of related accounts only with the request of a victim or an investigative agency was examined. And how it can be transformed and applied in crimes related to virtual assets was reviewed. The United States has a civil forfeiture system, which enables effective early response even in cases of Ponzi fraud involving multiple victims. In the Ponzi fraud case related to the ‘Banana Fund’ in 2020, there was a case in which more than $6.5 million of Bitcoin and Tether were confiscated in advance to reduce the damage to investors. In the long term, it is desirable for Korea to introduce a civil forfeiture system. However, this is a problem that requires the re-establishment of the confiscation system itself, and it will take a considerable amount of time for discussion of the system to settle. In order to immediately respond to crimes related to virtual assets, it is necessary to implement an emergency fund freezing system similar to the payment suspension system under ‘Special Act on Refund of Amount of Damage Caused by Telecommunications Bank Fraud’ The necessity of introducing an emergency asset freezing system for virtual asset-related crimes was discussed in the ‘Basic Act on Digital Assets’, which is being discussed for enactment. However, since it is different from the crime of ‘voice phishing’, it is necessary to be cautious so that the objection procedure through the arbitration of a neutral court that can adjust interests is democratically conducted so as not to interfere with normal economic activities.

미생물을 이용한 은 나노입자 생합성

유지연(Ji-Yeon Yoo),장은영(Eun-Young Jang),홍창오(Chang-Oh Hong),김근기(Keun-Ki Kim),박현철(Hyean-Cheal Park),이상몽(Sang-Mong Lee),김용균(Young-Gyun Kim),손홍주(Hong-Joo Son) 한국생명과학회 2018 생명과학회지 Vol.28 No.11

본 연구에서는 간단하고, 환경친화적인 은 나노입자 합성법을 개발하기 위하여 화학적 환원제 사용없이 Bacillus thuringiensis CH3의 배양상등액만을 사용하여 은 나노입자의 세포외 합성을 조사하였다. 5 mM AgNO₃와 배양상등액을 1:1로 혼합하여 반응시켰을 때, 은 나노입자의 표면 플라스몬 공명에 해당하는 418 nm에서 최대 흡광도를 나타내었다. 은 나노입자의 합성은 8시간 내에 일어났고, 40-48시간에 최대가 되었다. 합성된 은 나노입자의 구조적 특성을 다양한 기기분석에 의하여 조사하였다. FESEM 관찰은 잘 분산된 구형의 은 나노입자가 합성되었음을 보여주었고, 은의 존재는 EDS 분석으로 확인되었다. X선 회절 스펙트럼은 은 나노입자가 면심 입방결정격자임을 나타내었다. DLS를 사용하여 계산된 은 나노입자의 평균 입자 크기는 약 51.3 nm이었고, 범위는 19-110 nm이었다. 합성된 은 나노입자는 다양한 병원성 그람양성 세균, 그람음성 세균 및 효모에 대해 항균활성을 나타내었다. 가장 높은 항균활성은 인체병원성 효모인 C. albicans에서 관찰되었다. FESEM 관찰 결과, 은 나노입자의 항균활성은 세포 표층구조의 파괴와 세포질 누출에 따른 세포 용해에 기인하는 것으로 판단되었다. 본 연구는 B. thuringiensis CH3는 은 나노입자의 효율적인 합성을 위한 잠재적인 후보이며, 합성된 은 나노입자는 다양한 제약 분야에서 잠재적 응용가능성이 있음을 시사한다. The aim of this study was to develop a simple, environmentally friendly synthesis of silver nanoparticles (SNPs) without the use of chemical reducing agents by exploiting the extracellular synthesis of SNPs in a culture supernatant of Bacillus thuringiensis CH3. Addition of 5 mM AgNO₃ to the culture supernatant at a ratio of 1:1 caused a change in the maximum absorbance at 418 nm corresponding to the surface plasmon resonance of the SNPs. Synthesis of SNPs occurred within 8 hr and reached a maximum at 40-48 hr. The structural characteristics of the synthesized SNPs were investigated by various instrumental analysis. FESEM observations showed the formation of well-dispersed spherical SNPs, and the presence of silver was confirmed by EDS analysis. The X-ray diffraction spectrum indicated that the SNPs had a face-centered cubic crystal lattice. The average SNP size, calculated using DLS, was about 51.3 nm and ranged from 19 to 110 nm. The synthesized SNPs exhibited a broad spectrum of antimicrobial activity against a variety of pathogenic Gram-positive and Gram-negative bacteria and yeasts. The highest antimicrobial activity was observed against C. albicans, a human pathogenic yeast. The FESEM observations determined that the antimicrobial activity of the SNPs was due to destruction of the cell surface, cytoplasmic leakage, and finally cell lysis. This study suggests that B. thuringiensis CH3 is a potential candidate for efficient synthesis of SNPs, and that these SNPs have potential uses in a variety of pharmaceutical applications.

패션제조업의 분포 특성과 직능 간 연계성 분석

유지연 ( Ji Yeon Yoo ),이금숙 ( Keum Sook Lee ) 한국경제지리학회 2013 한국경제지리학회지 Vol.16 No.1

This study investigates the spatial distribution characteristics of Korean fashion industries during the last decade, in which the economic geography of fashion industries has changed dynamically with economic globalization and thus resulted in increased demand of diversification. In particular, this study examines the spatial distribution patterns of fashion industries in the Seoul metropolitan area where fashion industries are highly agglomerated. For the purpose, this study applies Moran`s I Index of spatial autocorrelation analysis for seven functional sectors of fashion industries related to fashion pro-duction. The global and local agglomeration patterns are examined for each functional sector. The results clarify the distinction in the spatial agglomeration patterns among the seven functional sectors of fashion industries in the Seoul Metropolitan area. Logit models are developed to examine the interrelationships among functional sectors in their spatial agglomeration distribution patterns. By conducting binary lo-gistic regression analysis, we find out how the spatial agglomeration of each functional sector is related to the others.

제7차 고등학교 가정과학 교육과정에 대한 평가

유지연 ( Ji Yeon Yoo ),신상옥 ( Sang Ok Shin ) 대한가정학회 2005 Human Ecology Research(HER) Vol.43 No.1

챗봇을 통한 스마트러닝 한국어교육의 학습 효과: 학습자 인식을 중심으로

유지연 ( Yoo Ji Yeon ),유훈식 ( Yoo Hoon Sik ) 한국멀티미디어언어교육학회 2021 멀티미디어 언어교육 Vol.24 No.2

With the development of Artificial Intelligence (AI) and its sharp growth in demand, AI chatbot has spread to other fields, including the field of language education on AI-based smart learning. This empirical study aims to review the learning effects of Korean education using AI chatbots in smart learning. In addition, the perceived learning effects of Korean as second language (KSL) learners were examined. Additionally, as the learning style of the learners could influence the learning effect, this study also compared the differences in perceived learning effect according to the students’ learning style (visual, auditory, and hands-on). The participants of this study used a Korean language education chatbot application and answered a survey on the learning effect, namely the earning content, learning flow, learning anxiety, learning efficacy, and learning satisfaction. The results showed that KSL learners considered Korean language education through chatbots was as effective as existing Korean language education. The chatbot also received positive evaluation in terms of decreasing learning anxiety and increasing learning efficacy. Furthermore, the study revealed that among the different learning styles, visual learners showed a significant reduction in learning anxiety.

한미 FTA와 투자자-국가 간 소송제도(ISD)에 대한 고찰

유지연 ( Yoo Ji-yeon ) 단국대학교 미래산업연구소 2018 산업연구 Vol.42 No.2

This study examines the Investor-State Dispute(ISD) included in the Investment Agreement to provide effective remedies for foreign investment. ISD is a system whereby investors can raise international arbitration directly against the state. This study focuses on the ISD regulated by the Korea - US FTA and examines two issues related to the ISD lawsuit filed recently by the Eliot against the merger with Samsung C & T and Cheil Industries. The first is whether the action is attributed to the investment host country. Even if a loss occurs to an investor, no state responsibility will arise unless the act is attributed to the state. The second is whether there is a violation of the international duty of conduct. Whether the Korean government violated the National Treatment provisions in the KOREA-US FTA is discussed.