비휘발성 메모리 소자응용을 위한 Eu 첨가량에 따른 BET 박막의 강유전 특성

김경태,김종규,우종창,김관하,김창일,Kim, Kyoung-Tae,Kim, Jong-Gyu,Woo, Jong-Chang,Kim, Gwan-Ha,Kim, Chang-Il 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.3

The effect of Eu contents on the ferroelectric properties of $Bi_{4-x}Eu_xTi_3 O_{12}$ (BET) thin films has been investigated. Bismuth Europium titanate thin films with a Eu contents were prepared on the $Pt/Ti/SiO_2/Si$ substrate by metal-organic decomposition technique. The structure and the morphology of the films were analyzed using X-ray diffraction (XRD) and field emission scanning microscopy (FE-SEM), respectively. From the XRD analysis, it was found that BET thin films have polycrystalline structure, and the layered-perovskite phase is obtained when the Eu contents exceeds 0.2 (x > 0.2). Also, the ferroelectric characteristics of the BET thin films were found to be dependent on the Eu content. Particularly, the BET films doped with x = 0.75 show better ferroelectric properties (remanent polarization 2Pr = 60.99 C/$cm^2$ and only a little polarization fatigue up to $3.5{\times}10^9$ bipolar switching cycling) than those doped with other Eu contents.

Pt/Bi_3.25La_0.75Ti₃O₁₂/ZrO₂/Si (MFIS)-FET 구조를 위한 ZrO₂ Buffer Layer의 영향

김경태,김창일,Kim, Kyoung-Tae,Kim, Chang-Il 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.5

We investigated the structural and electrical properties of BLT films grown on Si covered with $ZrO_{2}$ buffer layer. The BLT thin film and $ZrO_{2}$ buffer layer were fabricated using a metalorganic decomposition method. The electrical properties of the MFIS structure were investigated by varying thickness of the $ZrO_{2}$ layer. AES and TEM show no interdiffusion and reaction that suppressed using the $ZrO_{2}$ film as a buffer layer The width of the memory window in the C-V curves for the MFIS structure decreased with increasing thickness of the $ZrO_{2}$ layer. It is considered that the memory window width of MFIS is not affected by remanent polarization. Leakage current density decreased by about four orders of magnitude after using $ZrO_{2}$ buffer layer. The results show that the $ZrO_{2}$ buffer layers are prospective candidates for applications in MFIS-FET memory devices.

고압직류송전(HVDC) 접속설비 건설에 대한 합리적 비용분담 방안에 관한 연구

김경태(Kyoung-Tae Kim),진영규(Young-Gyu Jin),윤용태(Yong-Tae Yoon),위원석(Won-Seok Wi) 대한전기학회 2017 대한전기학회 학술대회 논문집 Vol.2017 No.7

직류 전력설비의 아크 검출을 위한 필터 설계에 관한 연구

김경태(Kyoung-Tae Kim),윤민영(Min-Young Yoon),남광우(Gwang-Woo Nam),조재인(Jae-In Jo),김응석(Eung-Seok Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.7

유기금속열분해 방법으로 제작된 NKN 박막의 강유전특성

김경태(Kyoung-Tae Kim),김창일(Chang-Il Kim),이성갑(Sung-Gap Lee) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7

(Na<SUB>0.5</SUB>LaK<SUB>0.5</SUB>)NbO₃ (NKN) thin films were fabricated by the alkoxide-based MOD method. NKN stock solutions were made spin-coated onto the Pt/Ti/SiO₂/Si substrate. The structural properties of the NKN thin films examined by x-ray diffraction. The perovskite phase was obtained as a function of the annealing temperature from 550℃ to 700℃ for lh, The crystallinity and grain size of the NKN thin films increased with increasing annealing temperature. The dielectric constants and loss of the NKN thin films annealed at 650℃ (t<SUB>eq</SUB>=2.35 ㎚) showed 323 and 0.025.

거리체감제 도입에 따른 체감율 산정에 관한 연구 : 철도부문을 중심으로

김경태(Kim Kyoung-Tae),유재균(Yoo Jae-Kyun) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-

Diminishing fare rate to distance is widely applied in transportation field including bus, but the decision method of diminishing rate is not established. The basic concept of diminishing fare rate to distance is that passengers have a benefit according to their travel distance. Furthermore, this can be justified in the standpoint of operator because the cost of long-distance traveller is lower than that of short-distance traveller to make same income. It is essential to introduce diminishing fare rate to distance to decide diminishing rate. We suggested methodologies regarding how to decide diminishing rate on the basis of operator costs.

다발성골수종에서 염색체 이상의 임상적 중요성

김경태 ( Kyoung Tae Kim ),백정환 ( Jeung Hoan Paik ),이창재 ( Chang Jae Lee ),김진호 ( Jin Ho Kim ),배이지 ( Yee Zee Bae ),서봉근 ( Bong Gun Seo ),권혁찬 ( Hyuk Chan Kwon ),오성용 ( Sung Yong Oh ),김성현 ( Sung Hyun Kim ),김재석 ( 대한내과학회 2005 대한내과학회지 Vol.69 No.3

목적: 다발성골수종은 단일 클론에서 유래하는 B 림프구의 악성종양으로 형질세포의 악성증식을 특징으로 하는 질환이다. 다발성 골수종은 임상 양상이 매우 다양하게 나타나며 생존율은 수개월에서 10년 이상으로 다양하다. 이 연구의 목적은 다발성골수종에서 특정한 세포유전학적 염색체 결함이 예후인자로서 가치가 있는지 알아보고자 하였다. 방법: 1995년 4월부터 2004년 8월까지 다발성골수종으로 진단 받은 환자 40예를 대상으로 하였다. 세포유전학적 검사는 세포중기 핵형분석을 하여 염색체 검사를 시행하였다. 정상염색체를 보인 군(A군)과 13번 염색체 결손 또는 부분 결손이나 저두배수체를 보이는 군(B군), 그리고 그 외의 염색체 이상을 보이는 군(C군)으로 분류하였다. 결과: 관찰기간의 중앙값은 13.1개월이었다(범위 1.5~92.1개월). 항암화학요법에 대한 총 반응율은 58.8%였고, A군, B군, C군 간의 치료에 대한 반응율은 각각 56.3%, 33.3%, 75%였다(p=0.229). 생존기간에 영향을 미치는 예후인자로는 임상적 병기, 활동도, 혈청 크레아티닌 수치, 성별 그리고 염색체 이상 여부 등이었다. A군, B군, C군 사이에 중앙생존기간이 유의하게 차이가 있었으며(각각 34.9개월, 8.5개월, 19.8개월, p=0.0125), 염색체 이상 중 13번 염색체 결손 또는 부분 결손과 염색체 저두배수체성이 다발성골수종에서 생존기간에 불리하게 작용하였다. 결론: 다발성 골수종에서 진단시 염색체 이상은 임상적 예후에 중요한 인자로 작용한다. Background: Multiple myeloma is a clonal B-cell malignancy manifested by the accumulation of terminally differentiated plasma cells. The disease is characterized by clinical heterogeneity, with survival ranging from a few months to more than 10 years. The purpose of this study is to evaluate the prognostic value of specific chromosomal abnormality in multiple myeloma. Methods: We analyzed the clinical records of 40 patients who were diagnosed as multiple myeloma, between April, 1995 and August, 2004. Cytogenetic analysis was conducted by metaphase karyotype analysis. Patients were grouped into normal cytogenetic group (arm A), complete or partial deletion of chromosome 13 and hypodiploidy group (arm B) and other cytogenetic abnormality group (arm C). Results: Median follow up duration was 13.1 months (range 1.5-92.1). Overall response rate to chemotherapy was 58.8% and response rate among arm A, B and C were 56.3%, 33.3% and 75%, respectively (p=0.229). The prognostic factors affecting survival were clinical stage, performance status, serum creatinine level, sex and chromosomal abnormality. The median overall survival was significantly different among arm A, B and C (34.9 months, 8.5 months and 19.8 months, respectively, p=0.0125). Conclusion: chromosomal abnormality, especially, complete or partial deletion of chromosome 13 and hypodiploidy at initial diagnosis is significantly associated with survival duration. (Korean J Med 69:303-311, 2005)

장애인 여가 및 스포츠 시설 접근성 : 한국과 미국의 여가 및 스포츠 시설 관련 법률 비교

김경태 ( Kyoung Tae Kim ),한근수 ( Keunsu Han ),김종채 ( Jongchae Kim ),한범석 ( Byumsuk Han ),이용호 ( Yongho Lee ) 한국특수체육학회 2020 한국특수체육학회지 Vol.28 No.4

본 연구는 미국과 국내의 장애인을 위한 여가 및 체육시설 관련법의 현황과 법위를 비교함으로서 국내 관련법 현황을 진단하고 향후 연구되어야 할 장애인 여가 및 체육시설의 관련연구와 제도 개선 및 법률제정의 기초자료로 활용될 수 있도록 하는 데 연구의 목적이 있다. 장애인의 체육시설 접근 환경을 개선하고 여가 및 스포츠 참여를 보장하는 것은 장애인의 복지차원을 넘어 국가의 기본 의무이다. 모든 사람에게 여가와 스포츠에 참여할 수 있는 기회를 제공하는 것은 매우 당연한 것이고 그것은 법으로 보장되어야 한다. 장애인의 당연한 권리인 스포츠 참여를 유도하고 스포츠 시설에 접근성을 용이하게 만드는 첫 걸음은 올바른 법제정과 시행이라고 사료된다. 본 연구를 통해 특히, 미국의 ADA 장애인법과 더불어 발표된 장애인 여가 및 스포츠 시설 접근성을 다룬 마국 장애인법 접근성 표준 (ADA Standard Accessible Design) 알아보고, 국내 장애인 스포츠 시설에 관련 법률 규정들과의 차이를 확인하고 개선점을 도출하고자 한다. Ensuring recreation and sport participation by improving recreation and sport facilities for people with disabilities is a government duty that goes beyond welfare for people with disabilities. Access to services, programs, and facilities for people with disabilities is essential, and must be guaranteed by law. It is believed that the first step to inducing participation in sports, a natural right of people with disabilities, and to making recreation and sports facilities accessible, is to enact and enforce the right legislation. This study diagnoses the status of laws related to leisure and sports facilities in Korea by comparing the purpose, scope, and legal areas of corresponding laws for people with disabilities in the U.S. and Korea. The study specifically investigates the ADA Standard Accessible Design, which deals with leisure and sports facility accessibility for the disabled, published in conjunction with the Americans with Disabilities Act (ADA) in the United States, and also identifies differences between related laws and regulations in order to improve the system and enact related studies on recreation and sports facilities for people with disabilities in Korea.

인터랙션 디자인 표현유형을 반영한 전시공간 특성

김경태(Kim, Kyoung-Tae),한혜련(Han, Hae-Ryon) 한국실내디자인학회 2016 한국실내디자인학회논문집 Vol.25 No.5

This study was to research and study whether the types of interaction design perform the effective functions and roles as the exhibition space that audiences want centered in the digital media exhibition space. It was to suggest effective space characteristics through analyzing how the interaction design was expressed at the exhibition space and its application. For the analysis, it completes theoretical inquiry on the classification of the space characteristics according to the concept type of interaction and design characteristics. Based on it, it directly visited the exhibition space that reflected the interaction design centered in Seoul City, experienced the given experience, and designed the analyzing frame by composing a checklist after the observation research. Through the designed analysis, it performed a site questionnaire to audiences. It induced the conclusion as follows after analyzing the case space that reflected the interaction design type. First, the program analysis of the space that has the variability is necessary through a variety of digital analysis as there is a limitation that the characteristic of digital media has. Second, in the concept type of the interaction design, it needs the interaction stage among people that can communicate with audiences and stimulate their senses through vidual factors. Third, in the characteristic of the interaction design, it should try to use effective contents to get over the limitation of the space through the interaction in the designated space in case of exhibition. In the following research, it needs to study on the variety of stage plans in detail by supplying contents to audiences and grafting to the exhibition space continuously through using the interaction design that uses digital media at there.

우리나라 포장규격 개정에 관한 연구

김경태 ( Kyoung Tae Kim ),이석 ( Suk Lee ),김영주 ( Young Joo Kim ),권용장 ( Yong Jang Kwon ),이명훈 ( Myung Hoon Lee ) 한국로지스틱스학회 2010 로지스틱스연구 Vol.18 No.3

포장은 유통의 시작으로 포장 표준화는 물류 표준화의 전제조건이다. 포장표준은 일반적으로 유닛로드로 많이 사용되는 파렛트 규격을 고려하여 결정된다. 최근 국내에서 표준파렛트의 이원화에 대한 연구가 발표되고 있고 향후 국제물류환경과의 정합성 확보를 위해서도 이원화된 파렛트와의 정합성 확보가 중요해 질 것으로 예상된다. 이에 따라 포장 표준화가 매우 중요한 시점이지만 현재까지 이와 관련된 연구는 거의 찾아볼 수 없는 실정이다. 본 연구에서는 현재의 포장규격이 적정한가에 대한 해답을 제시하고자 하였다. 이를 위해서 현재 우리나라와 해외의 포장규격 현황 분석, 관련 선행연구 동향 파악, 포장규격의 문제점 등을 분석하였으며 이원화된 파렛트와 포장규격간 적재효율 분석을 수행하였다. 이를 통해 포장규격 개정을 위한 4가지 기준을 제시하였다. 도출된 기준을 적용하여 현재의 포장치수 중에서 대표적인 11가지 포장치수를 제안하였다. 또한 제안한 포장치수 이외에 향후 추가할 포장치수에 대한 방향도 제시하였다. Packaging is the beginning of physical distribution so that packaging standardization should be achieved for logistics standardization. Packaging standards are usually determined in accordance with standard pallet since pallet plays an important role as unit load in logistics system. In Korea, recently several researchers have studied about dual standard pallets (1100×1100㎜ and 1200×1000㎜) for through transit considering global pallet standards. But it is hard to find the research about packaging standards considering dual pallet standards. This paper address the validity of the current packaging standards. Fist we analyse previous researches and domestic/international packaging standards. We also examine load efficiency of each packaging size to dual pallets. Based on the analysis results four principles for packaging standards are suggested. Applying the principle, 11 packaging standards are proposed. We also provide the direction of additional packaging standards besides the 11 standards. This study is expected to be used in revising packaging standard for unit load system.