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

저자들은 본 증례의 경우 치근이 흡수된 전치와 매복 견치의 발치 후 심한 치조골의 흡수와 연조직의 변화가 예상되는 것을 고려하여 발치 후 즉시 임플란트 수술을 결정하였다. 초기 안정성을 확보하기 위해 가능한 적은 골삭제, 보다 큰 직경과 치근형태의 임플란트를 선택하여 발치 후 즉시 임플란트를 식립하였고, 장골에서 채취한 망상골로 골결손부를 채우고 부가적으로 상순 지지를 위해 흡수성 차폐막과 순측 골면에 onlay형태의 골이식술을 시행하여 자연스럽고 심미적인 결과를 얻을 수 있었다. 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.

임상간호사의 의료 질 향상 활동에 관한 연구: 병원 간호병동 수준으로

유지연 ( Ji-yeon Yoo ),김광점 ( Kwang-jum Kim ) 한국병원경영학회 2017 병원경영학회지 Vol.22 No.1

Purposes: This study analyzed activities for improvement of quality of care in nursing units to identify group-level success factors of quality improving efforts. Methodology/Approach: Research subjects were 31 general wards of C university hospital, which has 1,200 beds. Data were collected through survey and focus group interview. The mean value of nurses in a ward was converted to unit-level variable value of the ward. The SPSS 24.0 version was used to analyse the data. The units were classified into two groups, high performing and low performing, by the subjective level of quality improvement performance. Findings: The main findings are as follows: 1. The high performing groups participated more in education related to quality improvement and showed more quality improvement cases in progress than that of their counterpart. 2. The high performing group`s nurses show more positive perception and attitude on quality improvement activities, and they have positive assessment on the necessity, effect, satisfaction about the quality improvement activities. 3. Middle managers` ability, attitude, motivation, and effective communication across members of the ward played pivotal roles in boosting the quality improvement activities of wards.

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.

Pseudomonas koreensis에 의한 잡초제어활성물질인 HCN 생성과 이 균주의 식물성장 촉진 및 흰개미 살충 활성

유지연 ( Ji-yeon Yoo ),장은진 ( Eun-jin Jang ),박수연 ( Soo-yeun Park ),손홍주 ( Hong-joo Son ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.9

To develope a microbial weed control agent, HCN-producing bacteria were isolated, and their characteristics were investigated. A selected strain of WA15 was identified as Pseudomonas koreensis by morphological, cultural, biochemical and 16S rRNA gene analyses. The conditions for HCN production was investigated by a One-Variable-at-a-Time (OVT) method. The optimal HCN production conditions were tryptone 1%, glycine 0.06%, NaCl 1%, and an initial pH and temperature of 5.0 and 30℃, respectively. The major component for HCN production was glycine. Under optimal conditions, HCN production was about 3 times higher than that of the basal medium. The WA15 strain had physiological activities, such as indoleacetic acid that was associated with the elongation of plant roots and siderophore and ammonification inhibiting fungal growth, and produced hydrolytic enzymes, such as cellulase, pectinase and lipase. The strain was able to inhibit the growth of phytopathogenic fungi, such as Rhizoctonia solani, Botrytis cinerea and Fusarium oxysporum, by the synergistic action of volatile HCN and diffusible antimicrobial compounds. A microscopic observation of R. solani that was teated with the WA15 strain showed morphological abnormalities of fungal mycelia, which could explain the role of the antimicrobial metabolites that were produced by the WA15 strain. The volatile HCN produced by the WA15 strain was also found to have insecticidal activity against termites. Our results indicate that Pseudomonas koreensis WA15 can be applied as a microbial agent for weed control and also as a termite repellent. Furthermore, it could be applied as a microbial termiticidal agent to replace synthetic insecticides.

요양병원 실태조사를 통한 입소자 적용 피난기구 개발

유지연(Ji-Yeon Yoo),한정권(Jung-Kwon Han),박남주(Nam-Ju Park),유미(Mi Yu),권대규(Tae-Kyu Kwon) 한국재활복지공학회 2024 재활복지공학회논문지 Vol.18 No.4

Long-term Care Hospital are facilities for long-term care and treatment of geriatric disease, etc. and are mainly hospitalized for the elderly and infirm who have difficulty moving and need the help of others in evacuation. Most of the residents have decreased cognitive and physical functions, which can lead to large-scale casualties in disaster situations such as fires. Therefore, the purpose of this study is to investigate evacuation devices that can be applied in the event of a fire in long-term Care Hospital and to derive evacuation devices that consider the characteristics of actual residents. To this end, a survey was conducted on five nursing homes in Jeollabuk-do (general status of facilities, types of residents, operating personnel, and evacuation devices) and a survey was conducted on nursing home workers. Residents of long-term care hospital were categorized into unable to self-evacuate, uncomfortable to self-evacuate, and able to self-evacuate groups according to whether they were able to self-evacuate. Of the 923 residents in the five nursing homes, 630 (68.3%) were unable to self-evacuate, 178 (19.3%) were uncomfortable to self-evacuate, and 115 (12.5%) were able to self-evacuate. In addition, the fact that 75.8% of the operating personnel in the nursing home are women (total 472 workers; 114 men and 358 women) and the absolute majority of residents who can not self-evacuate (87.6%) led to the proposal of a wheelchair-combined elevating evacuation device that can be applied in the event of a fire. When using it, up to three people in the self-evacuation group can evacuate, while the self-evacuation inconvenient group and the self-evacuation impossible group can evacuate with the evacuation personnel in wheelchairs. In the future, it is necessary to study the efficiency of applying the proposed evacuation devices for each resident through fire and evacuation simulations using each evacuation device proposed in this study.

Shadow IT를 고려한 새로운 관리체계 도입에 관한 연구

유지연(Ji Yeon Yoo),정나영(Na Young Jeong) 한국IT서비스학회 2016 한국IT서비스학회지 Vol.15 No.3

In a dynamic IT environment, employees often utilize external IT resources to work more efficiently and flexibly. However, the use of external IT resources beyond its control may cause difficulties in the company. This is known as “Shadow IT.” In spite of efficiency gains or cost savings, Shadow IT presents problems for companies such as the outflow of enterprise data. To address these problems, appropriate measures are required to maintain a balance between flexibility and control. Therefore, in this study, we developed a new information security management system called AIIMS (Advanced IT service & Information security Management System) and the Shadow IT Evaluation Model. The proposed model reflects a Shadow IT’s attributes such as innovativeness, effectiveness, and ripple effect. AIIMS consists of five fields: current analysis; Shadow IT management plans; management process; education and training; and internal audit. There are additional management items and sub-items within these five fields. Using AIIMS, we expect to not only mitigate the potential risks of Shadow IT but also create successful business outcomes. Now is the time to draw to the Light in the Shadow IT.

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 Yeungnam University Journal of Medicine 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.

고등학생의 과자류 섭취 실태 및 섭취 과자류의 「영양표시」조사

유지연(Ji Yeon Yoo),김영남(Young Nam Kim) 대한지역사회영양학회 2009 대한지역사회영양학회지 Vol.14 No.2

The purpose of this study was to find out the information on nutrition labeling and how many calories and nutrients the high school students consumed for 1 day from cookies. A total of 74 male and female high school students in Suwon were surveyed and 56 cookies that they consumed were examined. Background data were collected by questionnaire, cookie intake by 24-hr recall, and the calories and nutrients content in cookies and the amount of intake by nutrition information on the wrapping paper of cookie. The statistical analysis for the data was done by SPSS 12.0. Energy contents in 1 serving size of cookie were 90~315 kcal, average of 170 kcal. The protein contents were 0~7 g, fat 2~20 g, cholesterol 0~55 mg, and sodium 30~390 mg in 1 serving size of cookie. Most of the cookies (80%) examined contained no trans fat at all, which is desirable. Among the types of cookies, snacks contained higher quantities of calories and sodium, the pie contained more sugar and cholesterol, and the biscuit had more trans fat. One fourth of the cookies examined belonged to `high calorie, low nutritious food` according to the criteria proposed by The Ministry for Health, Welfare and Family Affairs. Thus the excessive intake of cookies might result in nutritional imbalance. There were large differences in calorie intake among students, from zero who did not intake any cookies at all to maximum 818 kcal/day, an average of 75 kcal/day. When the students who did not intake cookies were excluded, energy 205 kcal. fat 10g, sodium 177mg were consumed from the cookie for a 1 day on average. (Korean J Community Nutrition 14(2):147~157, 2009)