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Yeon Jung Kim(김연중) 한국표면공학회 2021 한국표면공학회지 Vol.54 No.4
The temperature and frequency dependence of the dielectric constant of the BaTiO₃ substituted with two types of donor dopants, Nb<SUP>5+</SUP> and Ta<SUP>5+</SUP>, respectively, were compared and analyzed. Dielectric specimens of four specific compositions, Ba0.95Nb0.05TiO₃, Ba0.90Nb0.10TiO₃, Ba0.95Ta0.05TiO₃, and Ba0.90Ta0.10TiO₃ were prepared by calcining at 1100 ℃ and sintering at 1300 ℃ to have a perovskite structure to measure capacitance. XRD and SEM analysis were used to observe the structure, with particular focus on the integration into the Nb<SUP>5+</SUP> and Ta<SUP>5+</SUP> substituted BaTiO₃ crystal lattice. X-ray diffraction peaks in the (200) and (002) planes were observed between 45.10˚ and 45.45˚ of the BaTiO₃ solid solution substituted with different fractions of Nb<SUP>5+</SUP> and Ta<SUP>5+</SUP>. The dielectric properties were analyzed and the relationship between the properties and structure of the substituted BaTiO₃ was established. The fine particles and high density of the substituted BaTiO₃ were maintained like pure BaTiO₃, and in particular, a shift toward the low temperature side of the phase transition temperature range was clearly found, unlike pure BaTiO₃. In addition, the phase transition at a temperature higher than the Curie temperature relatively satisfies the modified Curie-Weiss law.
생태계 모델을 이용한 진해ㆍ마산만에서의 빈산소수괴의 형성 및 발달에 관한 연구
김연중(Yeon Joong Kim),김명규(Myoung Kyu Kim),윤종성(Jung Sung Yoon) 한국해양공학회 2010 韓國海洋工學會誌 Vol.24 No.6
This study established a 3D ecosystem model composed if stratification considering the topographic heat accumulation effect and river outflow, and then applied this model to Jinhae, Masan Bay. Specifically, it reenacted the formation and developmental process if ODW according to the stratification by calculating the kinematic eddy viscosity and eddy diffusion coefficient of the stratification model. The results were used as input data for the ecosystem model and compared with DO, COD, I-N, and I-P, which is the standard index of ocean water quality. As a result, it was determined that COD and T-N are third grade and T-P is second grade standards for a natural environment.
아이코닉 이미지 데이타베이스에서 순위부여를 지원하는 새로운 공간매치 표현 기법
김연중(Yeon-Jung Kim),장재우(Jae-Woo Chang) 한국정보과학회 1999 정보과학회논문지(B) Vol.26 No.6
멀티미디어 정보 검색 응용에 있어서 관련성 있는 멀티미디어 문서를 검색하기 위해 이미지에 대한 내용-본위 검색이 필수적이다. 이를 위하여 본 논문에서는 이미지를 몇 개의 인식 가능한 심볼 즉, 아이콘으로 표현하고, 주어진 문서를 대표하는 값으로 받아들여 색인을 한다. 사용자가 이미지에 대한 내용-본위 검색을요구하면, 질의에 있는 이미지를 아이콘으로 변환한 후, 접근 기법을 통하여 원하는 이미지를 검색한다. 이를 위하여 본 논문에서는 방향관계 연산자와 위치관계 연산자를 합성하여 새로운 공간 매치 표현 기법을 제안한다. 제안하는 방법은 이미지 내의 아이콘들간의 관계성을 보다 정확하게 표현하며, 순위부여가 가능한 새로운 공간관계 표현 기법이다. 아울러 본 연구에서 제안한 방법을 기존의 9DLT 방법 및 SMR방법과 검색효율 면에서 성능 비교를 수행한다. 마지막으로 성능 실험을 통하여 제안한 방법이 기존의 9DLT 및 SMR방법에 비해 정확률 측면에서 약 0.1, 재현율 측면에서 약 0.2만큼 우수함을 보인다. In multimedia information retrieval applications, content-based retrieval on images is essential in order to retrieve relevant multimedia documents. For this, we represent images as a set of recognizable symbols, i.e., icon objects, and do indexing by regarding the icon object as a representative of a given document. When users request content-based image retrieval, we convert a query image into icon objects and retrieve relevant images m the database. In this paper, we propose a new spatial-match representation scheme which combines directional operators with positional operators. Therefore, our scheme can represent spatial relationships between icon objects precisely and can provide ranking for the retrieved images. In addition, we compare our scheme with the conventional 9DLT and SMR schemes in terms of retrieval effectiveness, Finally, we show from our experiments that our scheme with ranking holds about 0,1 higher precision value and about 0.2 higher recall value, compared with the 9DLT and the SMR.
청소년기 자아존중감의 하위요인 측정을 위한 검사도구 개발
김연중 ( Yeon Jung Kim ) 충남대학교 교육연구소 2009 교육연구논총 Vol.30 No.2
본 연구는 교육현장에서 청소년들에게 구체적인 도움을 주기 위하여 청소년기 자아존중감의 하위요인을 측정하는 검사 도구를 개발하는 데 목적이 있다. 이를 위하여 선행연구 및 기존의 검사 도구를 통해 청소년기의 발달적 특성에 따른 자아존중감의 하위요인을 도출해내고 각 하위요인에 대한 예비문항을 작성하였다. 내용타당도를 위하여 관련 전문가에게 1차 평정을 받은 후 예비 검사와 2차 평정으로 도구를 재정비하였으며 본 검사에서 검사도구의 신뢰도 및 타당도를 밝히고자 하였다. 본 연구에서 개발된 검사 도구는 학업적, 신체적, 사회적, 성격적, 도덕적 자존감의 5개 요인에 각각 8문항씩 총 40문항이며 Cronbach-α 계수는 .87이고 Rosenberg 검사도구와의 상관계수는 .98이었다. 또한 집단 간의 독립표본 t검증을 한 결과 통합적인 자아존중감 점수의 차이는 통계적으로 1% 수준에서 유의미하게 나타났으며 하위요인별에 따라서는 통계적으로 1% 또는 5% 수준에서 유의미한 차이를 보였다. The purpose of this study was to develope a scale for measuring the sub-factors of self-esteem in juvenile period in order to give adolescents specific help in education field. The sub-factors of self-esteem regarding developed characteristics in adolescent period were elicited and the measurement items for each sub-factor were selected through antecedent studies and existing scales. The scale made was firstly judged by experts concerned for content validity and readjusted through preliminary test and the second judgement, and the main test was performed to confirm the reliability and validity of scale. The finally developed scale was composed of 40 measurement items in total with 8 test items for five sub-factors which were learning self-esteem, physical self-esteem, social self-esteem, characteristic self-esteem and moral self-esteem, and the coefficient of Cronbach-α was .87 and the coefficient of correlation compared to Rosenberg scale was .98. Also, according to the results of independent-sample t test between two groups, the statistics showed that there was significant difference within 1% in the score of overall self-esteem and there were significant differences within 1% or 5% in view of sub-factors.
이미지 기반 샴 네트워크를 활용한 반도체 제조 공정의 이상 분류 및 중요 구간 탐지
김정인(Jung In Kim),목충협(Chunghyup Mok),김현지(Hyeonji Kim),김재훈(Jaehoon Kim),고효헌(Hyoheon Ko),홍지훈(Jihoon Hong),윤주연(Ju Yeon Yun),고정흔(Jeong Hun Ko),김연중(Yeonjung Kim),이지열(Jiyoul Lee),반효동(Hyodong Ban),김성범(Seoung 대한산업공학회 2024 대한산업공학회지 Vol.50 No.4
Semiconductor manufacturing processes are a fundamental component of modern industry and technology. Anomalies in this process degrade product quality and reliability, necessitating swift responses. To address this, various studies have been conducted on anomaly detection and efficient management using artificial intelligence algorithms. However, there are limitations that fail to consider the characteristics of actual process data, such as irregular patterns, numerous missing values, and varying data lengths. In this study, we propose to overcome these limitations by using image data with scatter plots applied to actual process data, employing a siamese network-based anomaly classification model based on the similarity with normal segments. Additionally, we apply gradient-weighted class activation map (Grad-CAM) to the siamese network model for identifying the main causes of abnormal segments. The validity and applicability of the proposed method have been demonstrated using data obtained from actual semiconductor manufacturing processes. The proposed method shows superiority in all comparative models. Furthermore, it has been confirmed that the main cause of the abnormal segment aligns with the abnormal judgment criteria for a specific segment of the field engineer.
남강댐방류에 따른 부유쓰레기의 거동 및 담수확산에 관한 연구
김연중(Yeon Joong Kim),윤종성(Jung Sung Yoon) 한국해양공학회 2009 韓國海洋工學會誌 Vol.23 No.2
Typhoon Rusa in 2002 was recorded as causing the biggest damage due to flood in our country. With the enormous damage to the land, the flood was totally discharged to the open sea. As a result, in the coastal area, the discharging of a river had a big influence in compariosn to the scale of the coastal area, which suffered damaged due to the discharging of the river. As it cleared the land, the load was totally discharging into the sea, where it caused various problems due to its influence on the ecosystem. These included chnges to the environment, like a diffrence in salinity and the inflow of a land load. Therefore, in this study, a Lagrangian particle tracking model was constructed using a flow model capable of solving the behavior of a river plume, supposing Sachon Bay. It is performed the research ablie to tendency-like valuation and reappearance about real event. The result was that the model was well approximated the sea area tendency and the river plume of the specific event.