(100) 및 (111) 배향을 갖는 CaF₂ 단결정 기판의 결함 분석

최예진,강민규,이기욱,박미선,정광희,정해균,김두근,이원재,Ye-Jin Choi,Min-Gyu Kang,Gi-Uk Lee,Mi-Seon Park,Kwang-Hee Jung,Hea-Kyun Jung,Doo-Gun Kim,Won-Jae Lee 한국결정성장학회 2024 한국결정성장학회지 Vol.34 No.1

The CaF₂ single crystal has notable characteristics such as a large band gap (12 eV), excellent transparency over a wide wavelength range, low refractive index and dispersion. Due to these outstanding properties, CaF₂ single crystal has considered as a promising material for short-wavelength light sources in recent lithography processes. However, there is an inherent birefringence of the material at 157 nm and the resulting aberration can be compensated for through the combination of the (100) plane and the (111) plane. Therefore, it is necessary to investigate the characteristics according to the plane. In this study, we analyzed crystallinity, optical properties of commercial CaF₂ single crystal wafers grown by the Czochralski method. In particular, through chemical etching under various conditions, it was confirmed that the shape of etch pits appears differently depending on the plane and the shape and array of specific etch pits affected by dislocations and defects were examined.

황산염환원균을 이용한 농경지 심부 토양 내 중금속 안정화 연구

최예진,이종운,황의정,황현준,한협조 한국자원공학회 2023 한국자원공학회지 Vol.60 No.3

Heavy metal stabilization in soil was investigated using sulfate-reducing bacteria (SRB). Samples were collected from three agricultural soils near abandoned mines, and a nine-week batch experiment was performed following the classification of soils as ① non-sterile soil with SO42- (SO4), ② sterile soil with SRB (SRBo), and ③ non-sterile soil with SRB and SO42- (SS). Heavy metals were extracted using 0.1 N HCl or Mehlich, and the stabilization efficiency was evaluated by comparing the results to the control. Pb, Zn, Cu, and Cd (4–55%) had higher stabilization efficiency than the control in Mehlich extraction, while Pb (2–41%) had higher stabilization efficiency than the control in 0.1 N HCl extraction. The SS samples demonstrated a high stabilization efficiency (17–55%), whereas the SRBo samples (2–37%) showed a low efficiency. Dissolved As decreased in the supernatant of the SO4 and SS samples, especially in the high-As soil. These results indicate that incorporating SRB and SO42- into soil contaminated with heavy metals can effectively decrease the mobility of As and heavy metals. 황산염환원균(SRB)을 이용하여 심부 토양 내 용존 중금속을 안정화시키는 연구를 수행하였다. 폐광산 주변 농경지 3 곳에서 토양을 채취하여 ① 비멸균 토양에 SO42-를 공급한 경우(SO4), ② 멸균토양에 SRB를 접종한 경우(SRBo), ③ 비멸균 토양에 SRB와 SO42-를 공급한 경우(SS)로 나누어 9 주에 걸친 배치 실험을 수행하였다. 1, 4, 7, 9주에 0.1 N HCl 및 Mehlich 단일용출법으로 토양을 용출한 후 비교시료에 대한 안정화 효율을 평가하였다. Mehlich 용출을 통해서는 Pb, Zn, Cu, Cd(4~55%), 0.1 N HCl 용출 결과, Pb(2~41%)가 비교시료에 비하여 높은 안정화 효율을 보였다. 또한 SS 시료(17~55%)에서 높은 안정화 효율을 보인 반면, SRBo 시료(2~37%)에서는 낮은 효율을 보였다. 토양 상등액을 채취하여 분석한 결과, As로 심각하게 오염된 토양의 SO4와 SS 시료에서 As 용출량이 감소하였다. 이는 중금속 오염 심부 토양에 SRB 및 적절한 SO42-를 공급하면 As 및 중금속의 이동도를 효과적으로 감소시킬 수 있음을 나타낸다.

Colpocleisis in elderly patients with pelvic organ prolapse: A single center 10 year experience

최예진,장지애,박정우,전경철,장두영,김영아,이응수 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-

The purpose of the study was to report efficacy and complications in women aged more than 70 years underwent colpoclesis operation. In this study, we analyzed the efficacy and compliacations of colpoclesis in 57 consecutive women who underwent colpoclesis in ilsan paik hospital, inje university between March 2002 and February 2012. The 42 patients underwent partial colpoclesis and 15 patients underwent total colpoclesis.The mean operating time was 105.3±15.7 minutes in partial and 123.4±23.6 minutes in total colpoclesis. The mean blood loss was 230.5±30.5 in partial and 280.0±20.0ml in total colpocleisis. Intraoperative complication was not occurred. The postoperative complication was occurred in 3 patients (5.3%). 2 patients complaint about voiding difficulty, one had obstructive bowel symptom. No recurrent pelvic organ prolapse was occurred. Colpoclesis technique in elderly women is an effective and very safe treatment of severe pelvic organ prolapsed.

Secure Healthcare Data Management and Sharing Platform Based on Hyperledger Fabric

최예진,김경진 한국인터넷정보학회 2020 인터넷정보학회논문지 Vol.21 No.1

In this paper, we present a healthcare data integration management and sharing platform based on a permissioned blockchain-based system called the Hyperledger fabric. The Hyperledger fabric allows patients to easily access their data, share the data with agencies that need it, and also reward participants. The healthcare data is stored in the blockchain by a de-identification process. Privacy is protected by setting detailed access rights to the stored data. The proposed model provides higher security than other models using a public blockchain. This study confirms that patient data can be stored more securely, by comparing the data stored in the blockchain with that from existing information storage methods.

드론의 접이식 로봇팔 설계 및 제어

최예진,Bhivraj Suthar,정슬 제어로봇시스템학회 2021 제어로봇시스템학회 국내학술대회 논문집 Vol.2021 No.6

GO-61 : Choriocarcinomatosis dedifferentiation from adenocarcinoma of the uterine cervix: A case report

최예진,장지애,오아름,박수미,김원정,박서윤,박정우,노지현,김영아,고재환,전경철 대한산부인과학회 2014 대한산부인과학회 학술대회 Vol.100 No.-

Choriocarcinomatosis dedifferentiation from adenocarcinoma of the uterine cervix is a very rare neoplasm. The prognosis of this tumor is extremely poor, despite chemotherapy and surgery. In the present study, we report a 45-year-old woman with Choriocarcinomatosis dedifferentiation from adenocarcinoma of the uterine cervix.

Immunomodulatory effects of seven viable and sonicated Lactobacillus spp. and anti-bacterial activities of L. rhamnosus and L. helvetilus

최예진,임현정,신혜순 한국미생물학회 2019 미생물학회지 Vol.55 No.4

Usage of probiotic lactic acid bacteria (LAB) has recently attracted more attention due to increased interests in human health. They are also known to possess immunomodulatory effects by promoting cytokine secretion and thus modulate inflammatory responses. This study has aimed to evaluate the immunomodulatory effects and antimicrobial activities of 7 Lactobacillus strains that had been obtained from Korean Collection for Type Culture. The RAW 264.7 cell line was used as a macrophage model to investigate into assess the nonspecific effects of seven Lactobacillus strains on the production of NO as well as the cytokines TNF-α and IL-1β. The minimum inhibitory concentrations of several antibiotics for the Lactobacillus strains and the anti-bacterial activities of viable and sonicated cells, from three select Lactobacillus spp., were measured on the growth of pathogenic bacteria. The sonicated LAB also stimulated IL-1β and TNF-α production compared with the RAW cell only. In addition, sonicated L. rhamnosus and L. helvetilus were found to have higher anti-bacterial activity than the viable LAB in this study. These results suggest that sonicated LAB could be used to modulate immune responses with straindependent.

Polyethylene glycol modified vegetable oil as a functional polyol for the preparation of thermoplastic polyurethane

최예진,프라카시,홍성철 한국고분자학회 2014 한국고분자학회 학술대회 연구논문 초록집 Vol.2014 No.10

소나무와 오일셰일의 혼합 촉매 열분해

최예진,임세정,신강호,김영민 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-

본 연구에서는 열중량 분석기와 마이크로 반응기-가스크로마토그래피/질량 분석기를 이용하여 소나무와 오일셰일 혼합 촉매 열분해에 대한 연구를 진행하였다. 열중량 분석 결과, 소나무와 오일셰일의 유기물 조성 차이로 인해 서로 다른 열분해 온도 구간이 나타나는 것을 확인하였다. 소나무의 최대 분해 온도는 오일셰일과의 혼합 주입 및 촉매 사용 여부에 관계없이 변화하지 않는 것을 확인하였다. 그러나 오일셰일의 경우에는 HBeta나 HY를 사용할 경우 분해 온도가 낮아지는 것을 확인하였다. 마이크로 반응기-가스 크로마토그래피/질량 분석 결과, 소나무와 오일셰일 모두 무촉매 열분해시에는 산소를 포함한 화합물이 다량 생성되었으나 촉매의 사용으로 인해 방향족화합물로의 효과적인 전환이 가능하다는 것을 확인하였다. 연구에 사용된 촉매 중 HZSM-5가 촉매의 산도와 기공특성으로 인해 가장 많은 양의 방향족화합물을 생성하였으며, 소나무의 촉매열분해 반응 중간체와 오일셰일의 반응 중간체 사이의 효과적인 Diels-Alder 반응에 의해 이론값보다 높은 방향족 생성효율이 나타나는 것을 확인할 수 있었다.

정보조직분야의 주요영역 및 내용요소 개발에 관한 연구

최예진,정연경 한국정보관리학회 2020 정보관리학회지 Vol.37 No.1

This study derives the main areas of information organization that should be covered in the formal curriculum of Library and Information Science, and suggests content elements for each area. Literature research, content analysis, survey and expert evaluation were conducted. Based upon these, information organization field was composed of four areas: information organization in general, classification, inventory, and practice, and a total of 31 content elements were presented. The content elements derived from each area through this study can be used as basic and helpful data when designing syllabus or teaching subjects in the field. In addition, it is possible to expand the content elements of each area of the information organization field through the research method used in this study. Finally, the results of this study will be used as basic materials when conducting the educational contents of information organization field. 본 연구는 문헌정보학 정규교육과정에서 중점적으로 다뤄야 하는 정보조직분야의 주요 영역을 도출하고, 영역별 내용요소를 제안하였다. 이를 위해 문헌연구, 내용분석, 설문조사 및 전문가평가를 수행하였다. 이를 통해 정보조직분야를 정보조직일반, 분류, 목록, 실습이라는 4영역으로 구성하고, 총 31개의 영역별 내용요소를 제시하였다. 본 연구를 통해 영역별로 도출된 내용요소들은 정보조직분야 교과목에 대한 강의계획안이나 교수 요목을 설계할 때 도움이 될 수 있는 기초자료로 활용할 수 있다. 또한, 본 연구에서 사용한 연구방법을 적용하여 정보조직분야의 주요 영역별 내용요소를 확장할 수 있기 때문에, 정보조직분야 교육내용을 설계를 위한 기초자료로 활용될 수 있을 것이다.