6자유도 자세 추정을 위한 대용량 3D 객체 데이터 구축

장재훈,김준용,김성흠 제어·로봇·시스템학회 2023 제어·로봇·시스템학회 논문지 Vol.29 No.12

Given the growing necessity of substantial human annotations in deep learning systems to enhance functionality and performance, it is imperative for researchers to scrutinize existing databases and develop their own datasets with custom labels, particularly for target applications such as object detection and pose estimation. This study introduces a large-scale 3D object dataset tailored for six degrees of freedom pose estimation in real-world scenarios. We describe the key features of our datasets available in the AI hub, emphasizing the expansive 3D object collection. Our methodology involves establishing a correspondence between eight points of an object cube in a 2D image, with the object’s pose determined using the conventional perspective-n-point (PnP) algorithm. To analyze the reprojection error, we employed a high-quality 3D mesh model and a binary mask of the target object in the RGB image. For database validation, all object categories were tested using a representative YOLO-like convolutional neural network architecture, such as real-time singleshot pose estimation. In addition, we conduct an in-depth analysis of the current database’s limitations. In the AI hub, we meticulously released all information regarding our new database, presenting it in a format consistent with our baseline database, LINEMOD. A comparative analysis against this baseline was conducted. To overcome the scalability concerns associated with unseen object categories, we explored an effective methodology that leverages vision and language knowledge distillation.

문화속의 과학 - 후각문화를 살리자

장재훈,Jang, Jae-Hun 한국과학기술단체총연합회 2000 과학과 기술 Vol.33 No.10

먹는 음시이나 마시는 술을 양으로 따지는 한국 사람들은 다른나라 사람보다 후각이 둔한 편이다. 기원 초 로마시대엔 향료가 인간의 쾌락용으로 유럽 상류사회에서는 신분 과시용 악세사리로 애용되었다. 최근 일본에서는 노인체취를 제거하는 향수를 개발했다고 발표하여 화제를 모으고 있다는데. 우리도 무디어진 후각을 살려내어 우리에게 맞는 향을 개발해 생활을 풍요롭게 하는 노력이 아쉽다.

표적탐지성능을 이용한 다중상태 소나의 효과도 분석

장재훈,구본화,홍우영,김인익,고한석,Jang, Jae-Hoon,Ku, Bon-Hwa,Hong, Woo-Young,Kim, In-Ik,Ko, Han-Seok 한국군사과학기술학회 2006 한국군사과학기술학회지 Vol.9 No.1

This paper is to analyze the effectiveness of multistatic sonar network based on detection performance. The multistatic sonar network is a distributed detection system that places a source and multi-receivers apart. So it needs a detection technique that relates to decision rule and optimization of sonar system to improve the detection performance. For this we propose a data fusion procedure using Bayesian decision and optimal sensor arrangement by optimizing a bistatic sonar. Also, to analyze the detection performance effectively, we propose the environmental model that simulates a propagation loss and target strength suitable for multistatic sonar networks in real surroundings. The effectiveness analysis on the multistatic sonar network confirms itself as a promising tool for effective allocation of detection resources in multistatic sonar system.

기업가정신과 창업의지의 구조에 관한 모델링 연구

장재훈,최미리,정성광 아이씨티플랫폼학회 2024 JOURNAL OF PLATFORM TECHNOLOGY Vol.12 No.3

최근에는 다양한 형태의 창업에 대한 지원이 늘어나고 있습니다. 이와 함께 창업에 대한 지원 확대 및 창업 성과 확대를 위해 창업교육에 대한 관심도 증대되고 있다. 따라서 창업교육 및 지원의 대상과 관심은 대학생과 일반 대중을 넘어 고등학생까지 범위를 확대하고 있다. 이에 따라 본 연구의 경우 창업에 대한 의도확대를 증대시키고자 기업가 정신의 역량과 창업태도 및 창업의지의 관계에 대해 보다 심층적으로 알아보고자 한다. 분석결과 기업가정신의 역량(창의성, 위험감수성, 혁신성)은 창업태도에 긍정적인 영향을 미쳤으며, 창업태도는 창업의지에 긍정적인 영향을 미쳤다. 창업태도의 기업가정신 역량(창의성, 위험감수성, 혁신성)과 창업의지의 관계에서의 매개효과에 대한 분석결과는 다음과 같다. 창의성과 창업의지의 관계에서 창업태도는 부분매개역할을 하였다. 위험감수성과 창업의지의 관계에서 창업태도는 부분매개역할을 하였다. 혁신성과 창업의지의 관계에서 창업태도는 완전매개역할을 하였다. 연구결론에서는 본 연구 결과의 요약, 기업가 및 창업에 대한 시사점과 더불어 본 연구의 한계 및 향후 연구방향을 제시하였다. Recently, support for various types of entrepreneurship has been increasing. At the same time, interest in entrepreneurship education is increasing to expand support for entrepreneurship and improve entrepreneurship performance. Therefore, the scope and interest of entrepreneurship education and support is expanding beyond college students and the general public to include high school students. Accordingly, this study seeks to investigate in more depth the relationship between entrepreneurship competency, entrepreneurship attitude, and intention to start a business in order to increase the intention to start a business. As a result of the analysis, entrepreneurship capabilities (creativity, risk-taking, and innovation) had a positive effect on attitude toward entrepreneurship, and attitude toward entrepreneurship had a positive effect on the will to start a business. In addition, the results of the analysis of the mediating effect of entrepreneurship attitude in the relationship between entrepreneurship capabilities (creativity, risk-taking, and innovation) and entrepreneurship will are as follows. First, in the relationship between creativity and entrepreneurial will, entrepreneurial attitude played a partial mediating role. Additionally, in the relationship between risk tolerance and entrepreneurial intention, entrepreneurial attitude played a partial mediating role. Lastly, in the relationship between innovation and entrepreneurial will, entrepreneurial attitude played a complete mediating role. The research conclusion summarizes the results of this study, suggests implications for entrepreneurs and start-ups, as well as limitations of this study and directions for future research..

베이지안 인공신경망 모델링을 이용한 오스테나이트계 내열강 크리프 수명 예측

장재훈,박이호,양원존 한국신뢰성학회 2024 한국신뢰성학회 학술대회논문집 Vol.2024 No.6

Modified iCAM06 기법을 이용한 HDR 영상의 tone compression 개선과 평가

장재훈,이성학,송규익 한국멀티미디어학회 2009 멀티미디어학회논문지 Vol.12 No.8

High-dynamic-range (HDR) rendering technology changes the range from the broad dynamic range (up to 9 log units) of a luminance, in a real-world scene, to the 8-bit dynamic range which is the common output of a display’s dynamic range. One of the techniques, iCAM06 has a superior capacity for making HDR images. iCAM06 is capable of making color appearance predictions of HDR images based on CIECAM02 and incorporating spatial process models in the human visual system (HVS) for contrast enhancement. However there are several problems in the iCAM06, including obscure user controllable factors to be decided. These factors have a serious effect on the output image but users get into difficulty in that they can’t find an adequate solution on how to adjust. So a suggested model gives a quantitative formulation for user controllable factors of iCAM06 to find suitable values which corresponds with different viewing conditions, and improves subjective visuality of displayed images for varying illuminations. HDR(high dynamic range) 렌더링 기술은 다이내믹 레인지가 9 log unit이 넘는 휘도 범위의 일반 장면을 눈으로 보는 장면의 느낌과 최대한 유사하게 일반적인 영상매체에 출력이 가능하도록 8 bit 해상도의 다이내믹 레인지로 변환하는 기술이다. 최근 가장 우수한 성능을 보이는 iCAM06 알고리듬은 iCAM (Image Appearance Modeling)과 CIECAM02를 토대로 만들어 졌으며, 기존 iCAM 모델에서는 제대로 고려하지 못한 공간 필터링 (spatial filtering) 처리와 여러 시각현상을 고려하여 설계하였다. 그러나 iCAM06 모델은 상당히 뛰어난 성능을 가지고 있음에도 불구하고, 몇 가지 문제점을 가지고 있는데, 그 중의 하나가 사용자 설정 변수들이다. iCAM06에서 필요한 입력 변수들은 렌더링 영상에 큰 영향을 끼치지만, 실험적인 최적 치로 결정되는 모호한 변수들이다. 본 논문에서는 iCAM06 모델에서 사용되는 사용자 설정 입력 변수들에 대해 다양한 시조건이 고려된 최적의 값을 제공할 수 있도록 정량화된 수식을 제공하고, 또한 개선된 모델을 통하여 향상된 톤 압축의 가시성 결과를 다양한 조건에서의 HDR 영상으로 확인하였다.

Regulatory T Cells in B Cell Follicles

장재훈,정연석 대한면역학회 2014 Immune Network Vol.14 No.5

Understanding germinal center reactions is crucial not only for the design of effective vaccines against infectious agents and malignant cells but also for the development of therapeutic intervention for the treatment of antibody-mediated immune disorders. Recent advances in this field have revealed specialized subsets of T cells necessary for the control of B cell responses in the follicle. These cells include follicular regulatory T cells and Qa-1-restricted cluster of differentiation (CD)8+ regulatory T cells. In this review, we discuss the current knowledge related to the role of regulatory T cells in the B cell follicle.

수술자가 시행하는 수술 전 갑상선 초음파 검사의 유용성

장재훈,최재영<SUP>1<.SUP>,박원서,송정윤,고석환,Jae Hoon Jang,M.D.,Jae Young Choi,M.D.,Ph.D.<SUP>1<.SUP>,Won Seo Park,M.D.,Jeong Yoon Song,M.D.,Ph.D. and Suck Hwan Koh,M.D.,Ph.D. 대한갑상선-내분비외과학회 2008 The Koreran journal of Endocrine Surgery Vol.8 No.1

<B>Purpose: </B>Although the diagnostic accuracy of thyroid cancer by fine needle aspiration cytology (FNAC) is increasing, there are some nodules for which ultrasonography and FNAC show indeterminant. The purpose of this study was to determine the usefulness of thyroid ultrasonography by the surgeon prior to operation <B>Methods:</B> Forty-nine patients who underwent thyroid operations between June 2006 and January 2007 were selected for this study. Thyroid ultrasonography was performed on each patient.And we recorded and analyzed the shape and the margin of the nodule, internal echogeneiety, heterogeneiety, the presence of microcalcification, height versus width, and the presence of level VI lymph node larger than 3 mm, assigning each a score of 1, 2 or 3. <B>Results: </B>The average score was 17.1. Assuming an average score over 14 is considered to be malignant, the sensitivity, specificity, positive predictive value, and negative predictive value were 95.6%, 88.9%, 91.7%, 94.1% respec</B>tively. Statistically significant characteristics of malignancy were the shape and the margin of the nodule, internal echogeneiety, microcalcification, taller than wide shape and the presence of enlarged VI lymph nodes. The heterogeneiety had no significant P value. <B>Conclusion: </B>When malignancy cannot be confirmed even after repeated FNAC, preoperative ultrasonograpy performed by surgeons can be a reliable test and helpful for operations. <B>(Ko</B><B>rean J Endocrine Surg 2008;8:28-32)</B>

실계통기반 제약조건 반영에 따른 계통한계가격과 시장참여자 편익 분석연구

장재훈,신한솔,곽규형,오효빈,윤형석,김 욱 대한전기학회 2024 전기학회논문지 Vol.73 No.1

The Korean electricity market previously determined the system marginal price (SMP) without considering actual operational constraints under the Cost Based Pool electricity market system. Recently, in order to improve system operational problems, the pricing methodology was revised to reflect constraints, with the goal of introducing the actual system-based day-ahead market. However, there are no studies comparing the methodologies before and after this change. This study used a mathematical model to simulate pricing methodologies both before and after the revision, deriving SMP, social welfare, and congestion surplus. This study evaluated the impact of the methodology change on the electricity market and underscored the need for further congestion cost studies. An analysis of this revision can serve as a reference for market and system operators to refine the domestic power market's pricing approach. It also assists market participants in managing financial risks and establishing countermeasures due to the methodology change.

운동과 아미노산 대사

장재훈,김정규 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The effects of Pre-exercise BCAA injection on amino acids levels and exercise performance. The subjects of present study were 10 university students. All subjects participated in VO₂ max test to calculate their 75% VO₂ max workload with BCAA injection and without BCAA injection. All exercise test were continued until subjects stopped because of fatigue. There were no big changes in the total exercise performance between BCAA injection experimental conditions. In the blood isoleucine, leucine, arginine, and phenylalanine concentration, there were no significant differences between BCAA injection experimental conditions(p>.05). The blood glutamate concentration was decreased following exercise, and end of exercise were a little bit increased. The blood alanine concentration was increased and there were significant differences at the end of exercise between BCAA injection experimental conditions(p<.05). The blood ammonia concentration was increased during exercise, but there were no significant differences between BCAA injection experimental conditions(p>.05). In this study, there was no positive effect of BCAA injection as a ergogenic aids and pre-exercise BCAA injection might be lead to premature fatigue.