염화동 수용액으로부터 Cu 미립자의 합성

윤지희,권현우,유연태,김병규,김광수,Yoon Ji-hee,Kwon Hyun-Woo,Yu Yeon-tae,Kim Byoung-Gyu,Kim Gwang-soo 한국재료학회 2005 한국재료학회지 Vol.15 No.4

In order to prepare the uniform copper particles from copper chloride solution, the reduction behavior of copper particles from copper chloride and the effects of reduction agent and dispersing agent was investigated. In the case that 2.56 M of $C_6H_8O_6$ was used as a reduction agent, the highly dispersed Cu particles with sharp size distribution were generated from 0.96M of copper chloride solution, and the size of Cu particles was $6\~10\;{\mu}m$. To form $Cu(NH_3)_4Cl_2$ complex solution, $NH_4OH$ was added in the copper chloride solution before the reductive reaction of Cu ion. The generated Cu particles have a two kind of shape, spherical and rod-like. In the case that $N_2H_4{\cdot}H_2O$ was used as a reduction agent, the very fine spherical Cu particles with the size of $0.2\~0.5\;{\mu}m$ was obtained. Arabic gum as a dispersing agent was more effective than $Na_4P_2O_7{\cdot}10H_2O$.

중첩된 릴레이션을 위한 추론 시스템

윤지희(Jee Hee Yoon) 한국정보과학회 1993 정보과학회논문지 Vol.20 No.10

본 논문에서는 속성값으로 집합치를 허용하는 네스트 관계를 지원하는 연역 데이타베이스 시스템의 추론 방식에 대하여 논한다. 본 연역 데이타베이스 시스템에서는 내부 데이타베이스와 외부 데이타베이스에 네스트 관계를 허용함으로써 자연스럽고 압축된 데이타 구조의 표현 방식을 도입하였다. 또한 외부 데이타베이스와 내부 데이타베이스의 네스트 관계에 출현하는 집합치를 효율적으로 처리할 수 있는 네스트 관계용의 단일화 알고리즘(unification algorithm)을 제시, 구현하여 시스템 전체의 효율 향상을 꾀하였다. 본 시스템에서는 네스트 관계를 위한 확장된 부분 컴파일 추론 방식에 의한 질의 처리에 의하여, 사실(fact)이 내부 데이타베이스와 외부 데이타베이스에 공존하는 경우에도 부리터럴(negative literal)을 바르게 평가할 수 있다. This paper presents an inference method for nested relations which include set valued attributes. By allowing the nested relations in the internal of external databases of deductive databases, we represent several complex data structures in a compact and natural way. An unification algorithm which can manipulate set valued attributes efficiently is given. We propose an extended partial compilation algorithm, which evaluates negative literals properly even when the facts exist in both the internal and external databases.

증례 : 혈액종양 ; 5-Fluorouracil과 Leucovorin 항암요법 후 발생한 심인성 쇼크 1예

윤지희 ( Jee Hee Yoon ),김동현 ( Dong Hyun Kim ),김승훈 ( Seung Hun Kim ),최원영 ( Won Young Choi ),고영일 ( Young Il Koh ),정익주 ( Ik Joo Chung ),배우균 ( Woo Kyun Bae ) 대한내과학회 2012 대한내과학회지 Vol.83 No.4

A 51-year-old man with rectal adenocarcinoma was admitted to hospital for neoadjuvant concurrent chemoradiotherapy. Three days after receiving 5-fluorouracil (425 mg/m2) and leucovorin (20 mg/m2) chemotherapy, the patient complained of chest pain. The patient had no history of cardiac disease. Electrocardiography showed ST segment elevation in leads II, III, and aVF, but the cardiac enzymes were normal. Transthoracic echocardiography revealed global hypokinesia with marked systolic dysfunction (ejection fraction 21.55%) and coronary angiography showed no significant stenosis. Unfortunately, he died of cardiogenic shock, despite intensive medical treatment. (Korean J Med 2012;83:525-528)

편마비 환자의 시각적 몸통 대칭 조절 강조가 보행 능력에 미치는 효과

윤지희(Yoon Ji Hee),유영열(You Young Youl),김정헌(Jung hun Kim),박종욱(Park Chong Uk) 대한치료과학회 2016 대한치료과학회지 Vol.8 No.2

In this study, through the visual body symmetrically emphasize the training of hemiplegia due to stroke by analyzing the effect of posture control and walking ability of hemiplegic patients during walking and propose a treatment for improving walking function. Method: Intervention in each group(N=40) was carried out for 5 days a week, 30 minutes per 8 weeks. The experimental group emphasized the symmetrical adjustment of the body to ensure unbiased verbal instructions are attached to the red point on the trunk and torso adjustable shoulder for visual emphasis. The control group underwent gait training using virtual reality program. Results: The change of the temporal factor was a significant change in the period of the Velocity, Cadence. The change of the spatial factor was a significant changes in the period of the DSP. Conclusion: The trunk symmetric visual emphasis of the training hemiplegia due to stroke showed better effect in the posture control and walking ability of hemiplegic patients than virtual reality training.

시스템 사고에 의한 수석교사제 분석

윤지희 ( Yoon Ji-hee ) 한국시스템다이내믹스학회 2018 한국시스템다이내믹스 연구 Vol.19 No.3

The purpose of this paper is to review Master Teacher System based on Systems Thinking perspective using causal loop analysis. The results are as follows. Master Teacher System is to support the teaching and research activities of the teachers through the activation of the master teacher system and to lead the teachers’ efforts to improve the teaching professionalism and to organize the teaching society. However, the virtuous cycle structure pursued by the policy did not appear to be activated, and there were problems such as reorganization and operational confusion, lack of confidence in masters’ professional abilities and increased burden of teaching time. This was the primary cause of the neglected factors in policy design and enforcement. The primary reason for this was the lack of legal basis and system for the role and status of the master teachers, teachers’ distrust of the master teacher selection mechanism, and the cost of city and provincial office of education and unit school. However, more fundamental factors than these primary causes have limited policy enforcement and achievement of goals. This was due to the secondary cause of the lack of on - site support, seniority culture, and dual structure of schools. The conclusion provides some research implications and future research direction.

부분 컴파일 추론 방식

윤지희(Jeehee YOON),高木利久(Toshihisa TAKAGI),牛島和夫(Kszuo USHIJIMA) 한국정보과학회 1988 한국정보과학회 학술발표논문집 Vol.15 No.1

본 논문에서는 연역(deductive) 데이타 베이스 시스템의 추론 방식으로서 부분 컴파일 추론 방식(Partial Compilation Inference Method)을 제안하고 이 방식에 의한 추론 시스템의 개발에 대하여 논한다. 부분 컴파일 추론 방식은 기존의 인터프리터 추론 방식(Interpretive Inference Method)과 컴파일 추론 방식(Compilation Inference Method)의 융합형으로서, fact가 내부(Internal) 데이타 베이스와 외부(External) 데이타 베이스에 공존할 경우에도 negative literal을 바르게 평가할 수 있다는 특색을 갖는다. 단, 본 논문의 추론 시스템은 cycle-free, function-free의 Horn clause 형식을 갖는 질문(Query)과 연역 rule만을 처리 대상으로 한다.

옻닭 섭취에 의한 급성전신발진농포증 2예

윤지희 ( Jee Hee Yoon ),이정원 ( Jeong Won Lee ),김지은 ( Ji Een Kim ),김동현 ( Dong Hyun Kim ),박상훈 ( Sang Hun Park ),김우진 ( Woo Jin Kim ),김영 ( Young Kim ),고영일 ( Young Il Koh ) 대한천식알레르기학회 2012 천식 및 알레르기 Vol.32 No.2

Background: Acute generalized exanthematous pustulosis (AGEP) is a rare severe pustular cutaneous eruption associated with fever and leukocytosis. Rarely, intake of lacquer chicken can induce AGEP. Case History: We described two cases of AGEP developed after ingestion of lacquer chicken, which showed a positive patch test and were accompanied by unusual clinical manifestations. Results: One 45-year-old man presented with fever, blood leukocytosis with neutrophilia, maculopapular skin rash and pustular formation, which developed after eating lacquer chicken. Severe hypotension and later elevated hepatic enzymes were accompanied. Patch test to undiluted lacquer was positive. The other 48-year-old man was admitted with fever, maculopapular skin rash and subsequent pustular formation and blood leukocytosis with neutrophilia following ingestion of lacquer chicken. One week later, blood eosinophilia and elevated liver enzymes were found. Conclusion: AGEP may be caused by ingestion of lacquer chicken via Type IV immune hypersensitivity and can be accompanied by hypotension, blood eosinophilia and/or abnormal hepatic function. (Korean J Asthma Allergy Clin Immunol 2012;32:131-135)

거대석회화를 동반한 갑상선 결절에서 갑상선암의 빈도

윤지희 ( Jee Hee Yoon ),김희경 ( Hee Kyung Kim ),김수정 ( Soo Jeong Kim ),조진성 ( Jin Seong Cho ),강호철 ( Ho Cheol Kang ) 대한내과학회 2012 대한내과학회지 Vol.83 No.3

목적: 갑상선 결절은 흔하게 발견되며 약 5%에서 갑상선 암으로 진단되므로 악성 결절과 양성 결절을 구분하는 것이 중요하다. 최근 고해상도 갑상선 초음파의 발달로 악성을 시사하는 초음파 소견을 예측하고자 다양한 연구가 진행되었고, 미세석회화와 악성화의 연관성이 확립된 반면, 거대석회화와 갑상선암의 연관성에 대한 논란이 있어 다수를 대상으로 후향적 연구를 시행하였다. 방법: 5년 동안 갑상선 결절로 인하여 화순전남대병원을 방문하여 갑상선 초음파를 시행하였던 환자들 중에서 갑상선적출술을 받았거나, 갑상선암의 위험인자로 잘 알려진 미세석회화를 동반하는 경우를 제외하고, 거대석회화 유무에 따라 두 군으로 구분하여 갑상선 초음파, 미세침흡인세포 검사 결과 및 수술을 통한 병리 결과를 확인하였다. 결과: 거대석회화를 동반하는 군에서 악성의 빈도는 22.7% (37/163)로 석회화가 불분명하거나 없는 군의 악성 결절의 빈도가 13.4% (271/2,021)인 것과 비교하여 통계학적으로 유의하게 높았고(p < 0.01), 비정형 및 악성의심 결절의 빈도도 유의하게 높았다(p < 0.01). 거친석회화 군에서 변연부석회 화군에 비해 통계학적 의의는 없었지만 악성의 빈도가 높았다(30.1% vs. 16.2%). 결론: 거대석회화를 동반한 갑상선 결절은 악성의 빈도가 높으며, 부적절한 검체를 얻을 확률이 높으므로 주의 깊은 미세침흡인세포검사 및 추적검사가 필요하다. Background/Aims: High-resolution ultrasonography has made it possible to predict thyroid cancers without invasive procedures. Densely calcified nodules are difficult to image on ultrasound, and considering them to be high risk features for thyroid cancers has been controversial. The aim of this study was to evaluate the prevalence of malignancy in patients with densely calcified nodules using an analysis of clinical parameters related to the development of thyroid cancer. Methods: We retrospectively reviewed the thyroid sonographic findings and clinical characteristics of patients with thyroid nodules who attended Chonnam National University Hwasun Hospital during a 5-year period (2,387 cases). Dense calcifications included coarse dense calcification and peripheral calcification (163 cases). Nodules with microcalcification (< 2 mm) were excluded from this analysis (154 cases). Ultrasonography-guided fine needle aspiration (FNA) was performed for all nodules with dense calcification. Results: Among the densely calcified nodules, 37 (22.7%) were malignant. The prevalence of malignancy in patients with densely calcified thyroid nodules was higher than that in patients without calcification (p < 0.01). The incidence of malignancy was greater in coarse calcified thyroid nodules than in nodules with peripheral (egg-shell) calcification, but this difference was not statistically significant (30.1% vs. 16.2%, p = 0.101). Conclusions: Nodules with dense calcification carry a higher risk for malignancy than non-calcified nodules. Further, it is more difficult to obtain an adequate or diagnostic sample for nodules with dense calcification. Therefore, careful evaluation is necessary to diagnose malignancy in densely calcified nodules.

토론을 활용한 숲체험활동이 유아의 생태소양에 미치는 영향

윤지희(Yoon, Ji-Hee),권은주(Gweon, Eun-Ju) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.3

This study would investigate the impact of forest experience activities using discussions on children’s ecological literacy. For this purpose, this study selected 26 five-year-old children in two classes in E. Kindergarten, Daejeon Metropolitan City and conducted 10 class-hour activities for 11 weeks with 13 children in one class. As a test tool, the ecological literacy scale developed by Lim, Jin-kyung (2017) was used, and data were analyzed by conducting an independent sample t-test and paired samples t-test. As a result of the study, it turned out that the overall score in the ecological literacy of the experimental group improved, and there were statistically significant changes in its sub-factors, including the right of nature, ecological sensitivity, ecological crisis, ecological development, and natural domination. These results draw implications that the “forest experience activities using discussions for young children” can promote children’s ecological literacy and that the activities can be utilized within the forest experience activities conducted in the actual field. 본 연구는 토론을 활용한 숲 체험 활동이 유아들의 생태소양에 미치는 영향을 살펴보고자 하였다. 이를 위하여 대전광역시의 E 유치원 만5세 유아 2개반 26명을 선정하여 1개반 13명을 실험 대상으로 하였고, 11주간 10차시의 활동을 실시하였다, 검 사도구로는 임진경(2017)이 제시한 생태소양척도를 사용하였으며, 독립표본 t검정 및 대응표본 t검정을 실시하여 자료를 분석하였다. 분석 결과 실험집단의 생태소양 전체 점수가 향상된 것으로 나타났으며, 하위요인인 자연의 권리, 생태감수성, 생태 위기, 생태개발, 자연지배에 있어서도 통계적으로 유의미하였다. 이러한 결과는 ‘토론을 활용한 숲체험활동’이 유아의 생태소양을 증진할 수 있으며, 실제 현장에서 진행되는 숲체험활동 내에서 활용이 가능하다는 시사점을 도출한다.

리튬이온전지 실리콘계 음극 바인더 소재 개발

윤지희 ( Jihee Yoon ),유정근 ( Jung-keun Yoo ) 한국복합재료학회 2022 Composites research Vol.35 No.6

전기자동차 및 E-모빌리티 시장이 급속히 성장함에 따라 리튬이온전지는 현재 가장 주목받는 기술 중 하나로 여겨지고 있다. 따라서 높은 용량 및 출력, 급속 충전 성능을 가지는 고에너지밀도 전극 개발이 매우 중요한 상황이다. 고에너지밀도 전극 구현을 위해서 음극의 경우 실리콘, 주석 등 고용량 활물질 소재에 대한 연구가 진행되고 있는 상황이다. 하지만 이러한 고용량 활물질 소재는 전지의 충방전 과정 시 발생하는 부피팽창이 전지의 성능을 저하시키는 주된 원인이 된다고 알려져 있다. 따라서 활물질의 부피팽창을 완화할 수 있는 바인더 소재 개발이 매우 중요한 상황이며, 기존 PVDF, CMC/SBR계 바인더 뿐만 아니라 수용성 고분자(polyacrylic acid, polyvinyl alcohol, aliginate 등)를 이용한 바인더 소재 개발 연구가 많이 보고되고 있다. 이처럼 앞으로 리튬이온전지의 고성능화를 위해서 바인더는 매우 중요한 기술이 되었으며, 본 논문에서는 리튬이온전지용 음극 바인더 소재의 연구 동향을 살펴보고자 한다. According to the rapid growth of electric vehicle (EVs) and E-mobility market, Li-ion batteries are one of the most progressive technologies. The demand of LIBs with high energy capacity, rate performance and fast charging is continuously increasing, hence high-performance LIBs should be developed. Si is considered as the most promising anode material to improve energy density because of its high theoretical capacity. However, Si suffers large volume chances during the charging and discharge process, leading to the fast degradation of cycle performance. Therefore, polymeric binders play a key role in electrochemical performance of Si anode by efficiently enduring the Si expansion and maintaining the binding networks in electrode. In this review, we explain the role of polymeric binders in electrode and introduce the anode binders with enhanced mechanical and chemical properties which can improve electrochemical performances of Si-based anode.