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.

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.

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.

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.

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.

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.

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

우울증을 경험한 청년기 여성의 모래상자치료 단일사례연구

최지연(Ji-Yeon Choi),이미나(Mi-Na Lee) 한국모래상자치료학회 2020 모래상자치료연구 Vol.10 No.1

본 연구는 우울증을 경험한 청년기 여성의 모래상자치료 사례이다. 본 연구의 대상자는 직장생활을 시작한 20대 후반의 여성으로 자신의 방향성을 찾아 일과 공부를 함께 하고 있었다. 모래상자치료를 통해 정서적 안정감을 찾고, 우울감을 해소하여 일상생활에서 활력과 목표를 향해 더욱 정진해갈 수 있기를 원했다. 치료의 효과성 검증을 위해 사전, 사후에 Beck(1967)의 우울척도검사를 실시하였다. 본 연구는 2018년 11월부터 2019년 6월까지 매주 1회, 50분간 총 30회기 실시하였다. 모래상자치료 사례에서 내담자가 물을 표현한 회기의 사진을 추출하여 물이 갖는 상징적 의미를 구분하여 분석하였다. 회기 초반에 창조의 의미를 상징하는 바다의 모습이 보였고, 중반에는 흐르는 강과 바다의 모습을 통해 내면의 정화와 치유를 상징하는 상자를 꾸몄다. 회기 후반에는 치열한 전투와 죽음을 통한 의식의 재탄생을 겪는 과정들이 나타나며 창조, 치유, 정화, 재탄생, 생명력을 상징하는 물의 의미가 상자에 나타난 것을 볼 수 있었다. 연구결과 첫째, 내담자의 우울 척도 수치가 객관적으로 감소하였고, 둘째, 심리적 안정과 내면의 변화를 통해 일상생활 속에서 자신을 돌볼 수 있는 여유가 생겼다. 셋째, 내담자가 목표하는 방향성에 있어 더욱 정진해 나갈 수 있는 정신적 힘이 생겼으며, 대인관계에서의 소통도 편안해졌다. This study is a case of sandtray therapy in adolescent women who experienced depression. The subject of this study was a woman in her late twenties who started her work life, and she was working and studying together looking for her direction. Through the sandbox treatment, he wanted to find emotional stability and relieve depression so that he could devote more to his vitality and goals in daily life. To verify the effectiveness of the treatment, Beck (1967) s depression scale test was performed before and after. This study was conducted once a week from November 2018 to June 2019, for a total of 30 sessions for 50 minutes. In the case of sandtray therapy, a photograph of the session in which the client expressed water was extracted, and the symbolic meaning of water was classified and analyzed. At the beginning of the session, the sea symbolizing the meaning of creation was seen, and in the middle, the flowing river and the sea were used to decorate a box that symbolizes inner purification and healing. In the second half of the session, the process of undergoing a rebirth of consciousness through fierce battles and death appeared, and the meaning of water, which symbolizes creation, healing, purification, rebirth, and vitality, appeared in the box. As a result of the study, first, the level of the client s depression scale objectively decreased, and second, there was room for self-care in daily life through psychological stability and internal changes. Third, the mental power to further devote itself to the client s goal direction was developed, and communication in interpersonal relationships became comfortable.

전통주택에 사용된 문양에 관한 연구

최지연(Choi, Ji-Yeon),박영순(Park, Young-Soon) 한국실내디자인학회 2001 한국실내디자인학회논문집 Vol.- No.28

승효상과 Louis I. Kahn의 건축에 나타난 `비어있음(Emptiness)`의 개념에 대한 연구

최지연(Choi, Jee-Yeon),이영수(Lee, Young-Soo) 한국실내디자인학회 2016 한국실내디자인학회논문집 Vol.25 No.5

This study is intended to examine the various kinds of emptiness that are shown in the empty spaces created by Hyo-Sang Seung and Louis I. Kahn. Architecture creates the usefulness of a certain space thanks to its emptiness. The word, ‘Emptiness’ has the following meanings, ‘non-fulfillment’, ‘non-existence’, ‘emptiness’, ‘blankness’, ‘non-visibility’ and ‘non-limitation’, etc. Such concepts of emptiness can be broadly divided into ‘ideological emptiness’, ‘aesthetic’ and ‘architectural spatial’. Comparisons regarding such concepts of emptiness as they are expressed in the architectural spaces created by Hyo-sang Seung and Louis I. Kahn shall be identified in this study. Hyo-sang Seung tried to leave numerous open possibilities which can contain everything into a certain space since ‘emptiness’ is not being used at this moment. Louis I. Kahn tried to contain into a space the essence and silence of that space before something that exists is created. The ‘emptiness’ created by Hyo-sang Seung and Louis I. Kahn is a specific space which can contain more kinds of non-visible spaces than some visible ones. Thus, such spaces may contain various potentials which are possible because they are empty, because of changes in nature and time, and because of silence and intentions going beyond an artist’s original intent.