JSSI(Japanese Society of Seismic Isolation) 10th Anniversary Symposium 참석기

이성재,김원종,Lee, Seong-Jae,Kim, Won-Jong 한국건축구조기술사회 2004 건축구조 Vol.11 No.4

자가배합사료 원료 공급 절차와 방법

이성재,Lee, Seong-Jae 대한양돈협회 1998 養豚 Vol.20 No.7

Split liability assessment in car accident using 3D convolutional neural network

이성재,Lee Yong-Gu 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.4

In a car accident, negligence is evaluated through a process known as split liability assessment. This assessment involves reconstructing the accident scenario based on information gathered from sources such as dashcam footage. The final determination of negligence is made by simulating the information contained in the video. Therefore, accident cases for split liability assessment should be classified based on information affecting the negligence degree. While deep learning has recently been in the spotlight for video recognition using short video clips, no research has been conducted to extract meaningful information from long videos, which are necessary for split liability assessment. To address this issue, we propose a new task for analysing long videos by stacking the important information predicted through the 3D CNNs model. We demonstrate the feasibility of our approach by proposing a split liability assessment method using dashcam footage.

위생.안전.건강 - 식품과 건강한 삶 - 올바른 식습관의 중요성 -

이성재,Lee, Seong-Jae 한국식품연구원 2008 한맛한얼 Vol.1 No.2

난소전위술을 시행한 가임기 여성의 자궁경부암 방사선치료 시 난소선량 감소를 위한 Halcyon^TM Fast kV CBCT의 유용성 평가 : Phantom study

이성재,신충훈,최소영,이동형,유순미,송흥권,윤인하,Lee Sung Jae,Shin Chung Hun,Choi So Young,Lee Dong Hyeong,Yoo Soon Mi,Song Heung Gwon,Yoon In Ha 대한방사선치료학회 2022 대한방사선치료학회지 Vol.34 No.-

Purpose: The purpose of this study is to evaluate the effectiveness of reducing the absorbed dose to the ovaries and the quality of the CBCT image when using the Halcyon^TM Fast kV CBCT of cervical cancer patients of child-bearing age who performed ovarian transposition Materials and Methods : Contouring of the cervix and ovaries required for measurement was performed on the computed tomography images of the human phantom (Alderson Rando Phantom, USA), and three Optically Stimulated Luminescence Dosimeter(OSLD) were attached to the selected organ cross-section, respectively. In order to measure the absorbed dose to the cervix and ovaries in the Truebeam^TM pelvis mode (Hereinafter referred to as TP), The Halcyon^TM Pelvis mode (Hereinafter referred to as HP) and The Halcyon^TM Pelvis Fast mode (Hereinafter referred to as HPF), An image was taken with a scan range of 17.5 cm and also taken an image that reduced the Scan range to 12.5cm. A total of 10 cumulative doses were summed, It was replaced with a value of 23 Fx, the number of cervical cancer treatments, and compared In additon, uniformity, low contrast visibility, spatial resolution, and geometric distortion were compared and analyzed using Catphan 504 phantom to compare CBCT image quality between equipment. Each factor was repeatedly measured three times, and the average value was obtained by analysing with the Doselab (Mobius Medical Systems, LP. Versions: 6.8) program. Results: As a result of measuring absorbed dose by CBCT with OSLD, TP and HP did not obtain significant results under the same conditions. The mode showing the greatest reduction value was HPF versus TP. In HPF, the absorbed dose was reduced by 39.8% in the cervix and 19.8% in the ovary compared to the TP in the scan range of 17.5 cm. the scan range was reduced to 12.5 cm, absorbed dose was reduced by 34.2% in the cervix and 50.5% in the ovary. In addition, result of evaluating the quality of the image used in the above experiment, it complied with the equipment manufacturer's standards with Geometric Distortion within 1mm (SBRT standard), Uniformity HU, LCV within 2.0%, Spatial Resolution more than 3 lp/mm. Conclusion: According to the results of this experiment, Halcyon^TM can select more various conditions than Truebeam^TM in treatment of fertility woman who have undergone ovarian Transposition , because it is important to reduce the radiation dose by CBCT during radiation therapy. So finally we recommend Halcyon^TM Fast kV CBCT which maintains image quality even at low mAs. However, it is consider that the additional exposure to low doses can be reduced by controlling the imaging range for patients who have undergone ovarian transposition in other treatment machines.

SVG를 이용한 유${\cdot}$무선 인터넷 환경에서의 캐릭터 서비스

이성재,유남현,양수영,김원중,Lee Sung-Jae,Yoo Nam-Hyun,Yang Soo-Yung,Kim Won-Jung 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.8

현재 유선 인터넷 환경에서는 이미지를 표현하기 위하여 대부분 GIF와 JPG를 이용하며, 무선 인터넷 환경에서는 SVG, wBMP, SIS, PNG, Flash Lite 등과 같은 다양한 이미지 파일들을 이용한다. 따라서 유${\cdot}$무선인터넷을 동시에 지원하기 위한 콘텐츠를 제작하는 경우 이중으로 제작비용이 소요되는 문제점이 있다. 이에 본 논문에서는 유무선 인터넷을 동시에 지원할 수 있는 서비스를 재발할 때, SVG를 효율적으로 적용하는 방법을 제안하였다. 유${\cdot}$무선 인터넷을 동시에 지원하는 서비스에 SVG를 이용함으로써 유${\cdot}$무선 인터넷 기반의 콘텐츠를 제작할 때 기업이 지출해야 하는 개발비용을 크게 줄일 수 있다. Currently, most wired Internet describes an image file using GIF and JPG and wireless Internet uses various image files such as SVG, wBMP, SIS, PNG, and Flash Lite. Accordingly, overlapping occurs in the investment of production cost for making contents. This thesis proposes a Character(Avatar) service that could simultaneously aid both wired and wireless Internet by utilizing SVG, a vector based image file format for describing two-dimensional graphics. We will reduce cost of developing contents, when develop contents that simultaneously supports wired and wireless Internet using SVG.

InGaN LED에서 칩 구조 및 칩마운트 구조에 따른 광추출효율에 관한 연구

이성재,Lee, Song-Jae 한국광학회 2005 한국광학회지 Vol.16 No.3

InGaN LED에서 칩 구조 및 칩마운트 구조에 따른 광추출효율의 변화를 Monte Calo 기법을 이용하여 해석하였다. Simulation을 통해 얻은 중요한 결론의 하나는, InGaAlP 또는 InGaN/SiC LED의 경우에서는 달리, InGaN/sapphire LED의 경우 칩의 측 벽면 기울임 기법의 광추출효율 개선효과가 상대적으로 미미하다는 점이다. InGaN/SiC LED의 경우와는 달리, 기판으로 사용되는 sapphire의 굴절률이 상대적으로 작아서 생성된 광자들이 기판으로 넘어가는데 전반사장벽을 만나게 되어, 많은 광자들이 기판으로 넘어가지 못하고 두께가 매우 얇은 반도체 결정층에 갇히는 현상 때문이다. 동일한 현상은 epi-down 구조의 칩 마운트에서 광추출효율이 크게 개선되지 못하는 원인으로도 작용하게 된다. 광추출효율 관점에서의 epi-down 구조의 InGaN/sapphire LED가 갖고 있는 잠재력을 살리기 위한 방법의 하나는 기판-에피택시 계면을 texturing 하는 것이라고 할 수 있는데, 이 경우 생성된 광자들이 다량기판으로 넘어갈 수 있게 되어 광추출효율이 현저하게 개선된다. The performance of the InGaN LED's in terms of the photon extraction efficiency has been analyzed by the Monte Carlo photon simulation method. Simulation results show that the sidewall slanting scheme, which works well for the AlInGaP or InGaN/SiC LED, plays a very minimal role in InGaN/sapphire LED's. In contrast to InGaN/SiC LED's, the lower refractive index sapphire substrate restricts the generated photons to enter the substrate, minimizing the chances for the photons to be deflected by the slanted sidewalls of the epitaxial semiconductor layers that are usually very thin. The limited photon transmission to the sapphire substrate also degrades the. photon extraction efficiency especially in the epitaxial-side down mount. One approach to exploit the photon extraction potential of the epitaxial-side down mount may be to texture the substrate-epitaxy interface. In this case, randomized photon deflection off the textured interface directly increases the number of the photons entering the sapphire substrate, from which they easily couple out of the chip and thereby improving the photon extraction efficiency drastically.

스마트폰중독과 정신병리 사이의 상관관계

이성재,김보라,최태규,이상혁,육기환,Lee, Sung-Jae,Kim, Borah,Choi, Tai Kiu,Lee, Sang-Hyuk,Yook, Ki-Hwan 대한생물정신의학회 2014 생물정신의학 Vol.21 No.4

Objectives This study aims to investigate possible associations between proneness toward smartphone addiction and certain psychopathological variables to evaluate the psychopathological meaning of smartphone addiction. Methods Questionnaires were assigned to 755 adults between September and November 2012. We used the Korean Smartphone Addiction Proneness Scale (SAPS), the Beck Depression Inventory (BDI), the Beck Anxiety Inventory (BAI), the Obsessive-Compulsive Inventory-Revised (OCI-R), and the Barratt Impulsivity Scale-11 (BIS-11). Subjects were classified into two groups according to the scores of the SAPS ; the addiction proneness group and the normal-user group. Results The addiction proneness group had significantly higher scores than the normal-user group in the BDI, BAI, OCI-R, and BIS-11. The scores of the SAPS were positively correlated with the scores of the BDI, BAI, OCI-R, and BIS-11. Using logistic regression analysis, smartphone addiction proneness showed a significant association with BIS-11. Conclusions The results of this study suggest that smartphone addiction proneness may be associated with depression, anxiety, obsessive-compulsive symptoms, and impulsivity. Furthermore, impulsivity could be a vulnerability marker for smartphone addiction proneness.

교량경관조명 적용사례

이성재,권형준,김륜환,Lee, Seong-Jae,Gwon, Hyeong-Jun,Kim, Ryun-Hwan 한국도로학회 2008 도로 : 도로학회지 Vol.10 No.3

사회양극화 해소,그리고 의료양극화를 고민하며

이성재,Lee, Seong-Jae 대한병원협회 2006 대한병원협회지 Vol.35 No.2