문화도시조성사업이 지역경제에 미치는 영향에 관한 연구

최지연,Choi, Ji-Yeon 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.2

문화는 도시경쟁력의 원천과 시민의 삶의 질 향상에 필수적인 요소이다. 현대사회는 지속적 경제성장과 도시재생을 위한 목적으로 문화산업과 결합하여 좀 더 지역적이고 창의성이 발현될 수 있는 도시를 만들고자 한다. 이러한 문화도시조성사업은 기반시설 건설 운영으로 인하여 생산, 고용, 그리고 소득의 인프라를 구축하였고, 역사 문화재에 대한 시민의식을 고취시켰다. 또한, 민족 문화 정체성 및 가치를 향상시켜 국가적 측면에서 효과적인 방안을 제시하였다. Culture is the essential requisite to improve the resource of city competitiveness and the quality of life. The modern society hope to make the city, more regional and able to be expressed creativity, combining with culture industries for the purpose continuous economic growth and regeneration city. This development industry of cultural city constructed employment and the production of income due to the operations by infra-construction. And It inspired civic awareness about Cultural History. In addition, It presented the effective direction of national aspects caused by improving the identity and the value of ethnicity, culture.

다환방향족 탄화수소(PAHs) 오염토양의 과황산 산화 시 철 활성화제의 영향

최지연,박정도,신원식,Choi, Jiyeon,Park, Jungdo,Shin, Won Sik 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.1

PAHs commonly found in industrial sites such as manufactured gas plants (MGP) are potentially toxic, mutagenic and carcinogenic, and thus require immediate remediation. In-situ chemical oxidation (ISCO) is known as a highly efficient technology for soil and groundwater remediation. Among the several types of oxidants utilized in ISCO, persulfate has gained significant attention in recent years. Peroxydisulfate ion (S₂O₈^2-) is a strong oxidant with very high redox potential (E⁰ = 2.01 V). When mixed with Fe²⁺, it is capable of forming the sulfate radical (SO₄^-·) that has an even higher redox potential (E⁰ = 2.6 V). In this study, the influence of various iron activators on the persulfate oxidation of PAHs in contaminated soils was investigated. Several iron sources such as ferrous sulfate (FeSO₄), ferrous sulfide (FeS) and zero-valent iron (Fe(0)) were tested as a persulfate activator. Acenaphthene (ANE), dibenzofuran (DBF) and fluorene (FLE) were selected as model compounds because they were the dominant PAHs found in the field-contaminated soil collected from a MGP site. Oxidation kinetics of these PAHs in an artificially contaminated soil and the PAH-contaminated field soil were investigated. For all soils, Fe(0) was the most effective iron activator. The maximum PAHs removal rate in Fe(0)-mediated reactions was 92.7% for ANE, 83.0% for FLE, and 59.3% for DBF in the artificially contaminated soil, while the removal rate of total PAHs was 72.7% in the field-contaminated soil. To promote the iron activator effect, the effects of hydroxylamine as a reducing agent on reduction of Fe³⁺ to Fe²⁺, and EDTA and pyrophosphate as chelating agents on iron stabilization in persulfate oxidation were also investigated. As hydroxylamine and chelating agents (EDTA, pyrophosphate) dosage increased, the individual PAH removal rate in the artificially contaminated soil and the total PAHs removal rate in the field-contaminated soil increased.

톱밥배지에서 재배된 표고버섯 품종별 이화학적 성분 비교

최지연,김민선,Choi, Ji Yeon,Kim, Min-Sun 한국버섯학회 2021 한국버섯학회지 Vol.19 No.3

표고버섯은 톱밥배지 재배기술의 발달로 세계적으로 가장 많이 생산되고 식용되는 버섯이며, 톱밥배지를 이용하여 재배된 표고버섯의 생산량이 늘고 있다. 본 연구에서는 톱밥재배 표고버섯의 품종별 식품학적 차이를 비교하고자 동일 조건에서 재배된 산조701호, 산조707호, 산조 715호, 참아람, L808 총 5품종 표고버섯의 일반성분, 영양성분 및 항산화 활성을 분석하였다. 동결건조된 표고버섯의 일반성분 함량은 회분 4.06~5.92 g/100 g, 조지방 0.75~1.02 g/100 g으로 품종별 차이가 크지 않았으나 조단백질은 21.24~29.15 g/100 g으로 품종간의 유의적 차이를 보였다. Trehalose는 산조701호에서 9.60±0.08 g/100 g으로 가장 높은 함량으로 확인되었다. 총 아미노산 조성은 glutamic acid>aspartic acid>leucine 순으로 높은 분포를 보였으며, 유의적 차이를 보인 아미노산은 glycine, alanine, valine, isoleucine, leucine, phenylalanine이었으며 산조707호, 산조715호, 산조701호, 참아람, L808 순으로 높은 함량을 보였다. 물 추출물의 총 폴리페놀 함량과 총 플라보노이드 함량은 산조715호가 3.49±0.04 mg GAE/g, 1.33±0.03 mg QE/g으로 가장 높게 나타났으며 다른 품종들과 유의적 차이를 나타내었다. 같은 톱밥배지와 환경에서 재배된 표고버섯 5 품종간의 유의적 차이가 확인된 성분은 조단백질, trehalose, 6종의 아미노산이었다. 하지만 한 곳의 임가에서 재배된 표고버섯 품종간의 비교 결과로, 품종별 시료 수를 확대한 추가실험을 통하여 품종간의 구별 가능성을 더욱 세부적으로 검토할 필요가 있다. With the development of sawdust medium cultivation technology, Lentinula edodes (shiitake mushroom) has become the most extensively produced and consumed mushroom globally. In this study, the approximate composition, nutritional components, and bioactive compounds of L. edodes were analyzed and compared for the five sawdust-cultivated shiitake mushrooms cultivars namely Sanjo701ho, Sanjo707ho, Sanjo715ho, Chamaram, and L808. The approximate range of the composition of freeze-dried shiitake mushrooms was 4.06-5.92 g/100 g of ash, 0.75-1.02 g/100 g of crude fat, and 21.24-29.15 g/100 g of crude protein. Sanjo701ho had the highest trehalose content (9.60±0.08 g/100 g), total polyphenol content (3.49±0.04 mg GAE/g), and total flavonoid content (1.33±0.03 mg QE/g) among the other shiitake mushroom cultivars. The total amino acid content was as follows: glutamic acid>aspartic acid>leucine. Glycine, alanine, valine, isoleucine, leucine, and phenylalanine contents were significantly decreased in the following sequence: Sanjo707ho, Sanjo715ho, Sanjo701ho, Chamaram, and L808. Crude protein, trehalose, and six types of amino acids were identified as classification indicators for the five cultivars of sawdust-cultivated shiitake mushrooms.

골유착성 치과 임플란트의 생존율에 관한 임상적 연구

최지연,고세욱,류현욱,Choi, Ji-Yeon,Koh, Se-Wook,Ryu, Hwun-Wook 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.4

Objectives: The aim of the present review was to evaluate survival rate and various factors associated with survival of osseointegrated implants. Patients and methods: The clinical comparisons were performed to evaluate survival rate of 794 endosseous implants that had been inserted between 2004 through 2008 in relation to sex and age of patients, position of implant, implant system and surface characteristics, length and diameter of implant, and bone graft technique. Results: The survival rate of implant was 94.3% in posterior area of maxilla and 98.6% in posterior area of mandible by position of implant, a statistically significant difference. As to diameter of implant, survival rate was 98.4% between the 4.0 and 4.5 mm and 75.0% in larger than 5.0 mm, that was statistically significant difference. There was a statistically significant difference regard to bone graft and surgical technique. The implant survival rate was 89.0% in a placement site which performed sinus lifting, and in case of implant placement with guided bone regeneration technique and without bone grafting was 97.6% and 100% each. Conclusion: According to these findings, this study establishes a relationship between survival rate of implant and position, surface characteristics, diameter of implant and bone graft technique.

토양내 오염된 2,4,6-trinitrotoluene (TNT)의 Eisenia fetida에 대한 독성 및 생물흡수

최지연,오상화,신원식,Choi, Jiyeon,Oh, Sanghwa,Shin, Won Sik 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.6

Toxicity and uptake of 2,4,6-trinitrotoluene (TNT) in three different soils (OECD soil, natural soil and loess) to earthworm (Eisenia fetida) were investigated at several different spiked concentrations of TNT (0 to 200 mg/kg for OECD and natural soils, and 0 to 35 mg/kg for loess) and for different exposure periods (7, 14, 21, and 28 d). The LC<SUB>50</SUB> values for 7 d exposure were 160.1, 159.4, and 28.81 mg/kg for OECD soil, natural soil, and loess, respectively. The LC<SUB>50</SUB> values for 14, 21, and 28 d exposure were almost the same as those for 7 d exposure, showing that 7 d exposure time was enough to decide the toxicity (LC<SUB>50</SUB>) of TNT to Eisenia fetida, because the highest concentration of TNT in earthworm body was observed within around 5 d. The LC<SUB>50</SUB> and uptake of TNT in loess were higher than those in OECD and natural soil. The uptake of TNT to the earthworm were correlated well with the initial concentration of TNT in the soil and TNT porewater concentration (R<SUP>2</SUP>> 0.9 in OECD, natural, and loess). The concentration of TNT in earthworm body decreased after 5 d, possibly caused by natural degradation of TNT by soil bacteria as well as earthworm.

시뮬레이션을 이용한 성형외과 예약패턴 분석

최지연,정예림,박선주,정승화,Choi, Jiyeon,Chung, Yerim,Park, Sunju,Chung, Seungwha 한국시뮬레이션학회 2018 한국시뮬레이션학회 논문지 Vol.27 No.1

Generally, solutions that can increase patients' satisfaction are in conflict with the solutions that can increase the satisfaction and profitability of the medical personnels. In this paper, we compare appointment patterns using multiple performance measures that take into account both hospital's position and customers' position, and propose the best appointment pattern especially for an efficient scheduling in a plastic surgery clinic. A simulation model using ARENA is designed based on real hospital data. Based on this model, we compare 5 appointment patterns. To check the robustness of the appointment patterns, we have experimented on various appointment situations by considering peak, extreme peak seasons, and peak, off-peak days. We found that Triangle-like pattern turned out to be most efficient regardless of appointment situations. 일반적으로 고객의 만족도를 높이는 방안은 병원의 이익 및 병원 의료진들의 만족도를 높이는 방안과는 상충된다. 이에 본 논문은 병원과 고객을 함께 고려한 평가지표를 사용하여 여러 가지 예약 패턴들을 비교해보고 병원의 효율적인 운영을 위해 성형외과에 적절한 예약 패턴을 제안하고자 한다. 본 논문에서는 도심에 위치한 실제 성형외과의 고객 및 진료 데이터를 이용해 시뮬레이션 모델을 설계하고, 이 모델을 대상으로 5가지 예약 패턴을 비교하였다. 예약 패턴의 강건성을 체크하기 위하여 성수기와 극성수기, 피크 요일과 한적한 요일 등 다양한 상황 하에서 실험을 진행하였다. 실험 결과, 본 연구에서 새롭게 제안하는 Triangle-like Pattern이 예약 수와 관계없이 가장 좋은 결과를 보여주었다.

캐릭터 육성 게임을 통한 수면 건강관리

최지연(Choi Jiyeon),정찬영(Jung chanyeong),최영주(Choi youngju),최은진(Choi Eunjin),신혜원(Sin hyewon),광휘(TRUONG QUANGHUY),박세진(Park Sejin) 한국정보기술학회 2023 Proceedings of KIIT Conference Vol.2023 No.6

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최지연 ( Jiyeon Choi ),류지철 ( Jicheol Ryu ),김진선 ( Jinsun Kim ),장희선 ( Heesun Jang ),이종문 ( Jongmun Lee ),박재홍 ( Jaehong Park ),신동석 ( Dongseok Shin ) 한국물환경학회(구 한국수질보전학회) 2019 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2019 No.-

극초단 레이저 기반 정밀가공 생산성 증대를 위한 어블레이션 효율 최적화

최지연(J. Choi),임미래(M. R. Lim),김용현(Y. H. Kim),손현기(H. K. Sohn),신동식(D. S. Shin),김도진(D. J. Kim) 한국정밀공학회 2015 한국정밀공학회 학술발표대회 논문집 Vol.2015 No.12월

SCORM conformance testing 의 설계 및 구현

최지연 ( Ji-yeon Choi ),민수홍 ( Su-hong Min ),조동섭 ( Dong-sub Cho ) 한국정보처리학회 2004 한국정보처리학회 학술대회논문집 Vol.11 No.1

90 년대 후반부터 웹 기반 수업(Web-based instruction)이라 하여 인터넷을 이용한 새로운 교육방법이 시도되었다. WBI 에 필요한 각종 프로그래밍을 수작업으로 진행하여야 한다는 문제점을 극복하기 위해 개발된 학습운영체제(Learning Management System)가 개발되면서 인터넷을 통한 교육은 급속히 확산되고 있다. 무선 인터넷 기술까지 수용하는 개념인 소위 e-Learning 체제로 발전되면서 e-Learning 의 수요는 급속히 증가하게 되었다. e-Learning 기술 표준 개발을 실질적으로 주도하는 기관들인 IEEE, AICC, IMS 가 제안하는 개별 표준안들을 ADL 에서 SCORM(Sharable Content Object Reference Model)이라는 종합적인 표준안으로 수렴하게 되면서 SCORM 을 기준으로 만든 다양한 컨텐츠가 개발되고있다.