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A new method of fabricating robust freeform 3D ceramic scaffolds for bone tissue regeneration
Seol, Young‐,Joon,Park, Dong Yong,Park, Ju Young,Kim, Sung Won,Park, Seong Jin,Cho, Dong‐,Woo Wiley Subscription Services, Inc., A Wiley Company 2013 Biotechnology and bioengineering Vol.110 No.5
<P><B>Abstract</B></P><P>Fabrication of three‐dimensional (3D) scaffolds with appropriate mechanical properties and desired architecture for promoting cell growth and new tissue formation is one of the most important efforts in tissue engineering field. Scaffolds fabricated from bioactive ceramic materials such as hydroxyapatite and tricalcium phosphate show promise because of their biological ability to support bone tissue regeneration. However, the use of ceramics as scaffold materials is limited because of their inherent brittleness and difficult processability. The aim of this study was to create robust ceramic scaffolds, which have a desired architecture. Such scaffolds were successfully fabricated by projection‐based microstereolithography, and dilatometric analysis was conducted to study the sintering behavior of the ceramic materials. The mechanical properties of the scaffolds were improved by infiltrating them with a polycaprolactone solution. The toughness and compressive strength of these ceramic/polymer scaffolds were about twice those of ceramic scaffolds. Furthermore, the osteogenic gene expression on ceramic/polymer scaffolds was better than that on ceramic scaffolds. Through this study, we overcame the limitations of previous research on fabricating ceramic scaffolds and these new robust ceramic scaffolds may provide a much improved 3D substrate for bone tissue regeneration. Biotechnol. Bioeng. 2013; 110: 1444–1455. © 2012 Wiley Periodicals, Inc.</P>
New Breast Measurement Technique and Bra Sizing System Based on 3D Body Scan Data
Seolyoung Oh,Jongsuk Chun 대한인간공학회 2014 大韓人間工學會誌 Vol.33 No.4
Objective: The aim of this study was to develop a method for measuring breast size from three-dimensional (3D) body scan image data. Background: Previous bra studies established reference points by directly contacting the subject"s naked skin to determine the boundary of the breast. But some subjects were uncomfortable with these types of measurements. This study examined noncontact methods of extracting breast reference points from 3D body scan data that were collected while subjects were wearing standardized soft bras. Method: 3D body scan data of 32 Korean women were analyzed. The subjects were selected from the Size Korea 2010 study. The breast landmarks were identified by graphic analyses of slicing contour lines on 3D body scan data. Results: Three methods determining bra cup size were compared. The M1 and M2 methods determined cup size by calculating the difference between bust girth and under-bust girth. The M3 method determined bra cup size by measuring breast arc length. Conclusion: The researchers proposed an anthropometric bra cup sizing system with the breast arc length (M3 method). It was measured from the geometrically defined landmarks on the 3D body scan slicing contour lines. The new bra cup size was highly correlated with breast depth. Application: The noncontact measuring method used in this study can be applied to the ergonomic studies measuring sensitive body parts.
장설영(Seolyoung Chang),정호붕(Hobung Chung) 한국문화융합학회 2023 문화와 융합 Vol.45 No.12
본 연구는 노인을 대상으로 음악극이 우울과 자아존중감에 미치는 영향을 알아보고자 하는 데 목적이있다. 본 연구의 대상은 경기도 N시에 있는 노인복지센터를 이용하는 만 65~75세의 노인 23명이다. 음악극 프로그램은 주 1회, 120분으로 총 8회기를 실시하였다. 이에 따른 효과성 검증은 프로그램 시행 전과 후, 노인 우울 검사와 자아존중감 검사를 실시하고 분석하였다. 연구 결과, 음악극이 노인의우울 감소에 유의(t=5.348, p<.001)하였으며, 자아존중감 향상에 유의(t=-7.934, p<.001)하였다. 따라서본 연구를 통해 음악극이 노인의 우울 감소 및 자아존중감 향상에 긍정적인 영향이 있음을 확인하였다. The purpose of this study is to investigate the effects of musical theater on depression and self-esteem in elderly people. The subjects of this study were 23 elderly people aged 65 to 75 who used a senior welfare center in N-si, Gyeonggi-do. The music theater program was conducted once a week for a total of 8 sessions, 120 minutes per session. To verify its effectiveness, geriatric depression tests and self-esteem tests were conducted and analyzed before and after the program was implemented. As a result of the study, musical theater was significant in reducing depression in the elderly (t=5.348, p<.001) and improving self-esteem (t=-7.934, p<.001). Therefore, this study confirmed that musical theater has a positive effect on reducing depression and improving self-esteem in the elderly.
자율주행기반 교통운영관리를 위한 ADA 개념 정립 및 적용 기법 개발
이설영(LEE, Seolyoung),오민수(OH, Minsoo),오철(OH, Cheol),정은비(JEONG, Eunbi) 대한교통학회 2018 대한교통학회지 Vol.- No.-
자율주행자동차는 속도제어를 통해 교통류의 용량을 증대시키고, 위험 상황 발생 시 차량을 제어함으로써 인적요인으로 인한 사고를 감소시키는 첨단기술로 대두되고 있다. 그러나 자율차와 비자율차가 혼재되어 있는 상황에서 개별자율차의 주행행태가 인근 비자율차에 영향을 미쳐 교통류의 성능이 저하될 것이라는 기존 연구결과들이 꾸준히 발표되고 있다. 이러한 연구 결과는 자율주행환경에서 도로교통시스템의 운영효율성과 안전성을 증대시키기 위한 교통운영관리의 필요성을 나타내며, 본 연구에서는 자율주행기반의 교통운영 관리를 위한 새로운 개념을 제안하고 이를 통한 교통운영관리 방안을 제시하고자 한다. 본 연구에서는 개별자율차의 주행특성을 반영한 자율주행강도라는 새로운 개념을 정의하였으며, 시뮬레이션 분석을 통해 자율주행강도에 따른 교통류의 변화와 적정 자율주행강도를 도출하는 방법론을 제시하였다. 분석 시나리오 설정 시 자율주행강도, 서비스수준, 시스템보급률, 사고유무를 고려하였으며, 운영효율성과 안전성 평가를 위해 주행속도와 상충건수를 평가지표로 활용하였다. 분석결과 시나리오 구성요소와 자율주행강도간의 관계를 파악하였으며, 운영효율성과 안전성 지표간의 패턴을 분석하였다. 통행자유도가 낮은 경우, 자율차의 주행 적극성이 높아질수록 안전성이 저하되는 것으로 나타났으며 소극적인 자율주행강도가 적정함을 확인하였다. 본 연구에서 제안한 자율주행강도는 자율주행시대의 새로운 교통운영관리 기법 및 전략 수립의 기반이 되어 보다 안전하고 효율적인 자율주행환경 구현에 활용될 수 있을 것으로 기대된다. Emerging automated driving environments will lead to a mixed traffic flow depending on the interaction between automated vehicles (AVs) and manually driven vehicles (MVs) because the market penetration rate (MPR) of AVs will gradually increase over time. Understanding the characteristics of mixed traffic conditions, and developing a method to control both AV and MV maneuverings smoothly is a backbone of the traffic management in the era of automated driving. To facilitate smooth vehicle interactions, the maneuvering of AVs should be properly determined by various traffic and road conditions, which motivates this study. This study investigated whether the aggressiveness of AV maneuvering, defined as automated driving aggressiveness (ADA), affect the performance of mixed traffic flow. VISSIM microscopic simulation experiments were conducted to derive proper ADAs for satisfying both the traffic safety and the operational efficiency. Traffic conflict rates and average travel speeds were used as indicators for the performance of safety and operations. While conducting simulations, level of service(LOS) and market penetration rate(MPR) of AVs were also taken into considerations. Results implies that an effective guideline to manage the ADA under various traffic and road conditions needs to be developed from the perspective of traffic operations to optimize traffic performances.
고속도로 유입연결로 구간 화물차 군집운영전략 수립 방안 연구
이설영(LEE, Seolyoung),오철(OH, Cheol) 대한교통학회 2018 대한교통학회지 Vol.- No.-
차량의 자율주행기술과 차량간 무선통신을 통한 정보공유 군집주행 서비스가 실현되고 있다. 군집주행이란 여러대의 차량이 최소한의 안전거리만 유지한 채 일정한 간격을 두고 주행하는 기술이다. 이러한 군집주행은 도로의 용량을 증대시키고, 안전성을 향상시키며, 연료소비를 줄일 수 있는 잠재력을 가지고 있어 교통류 운영효율성, 안전성, 환경성 문제를 해결할 수 대안으로 주목받고 있다. 그러나 군집주행차량과 주변의 일반차량간의 적절한 상호작용이 가능할 때 교통류의 성능은 최적화 될 수 있다. 특히 교통운영 관리자는 화물차가 군집주행을 할 경우 유입연결로에서 비자율차가 안전하게 진입할 수 있도록 군집간간격과 군집크기와 같은 군집주행 파라미터를 조정하여 안전성과 운영효율성을 극대화시킬 수 있어야 한다. 본 연구에서는 고속도로 유입연결로 구간에서 교통류 퍼포먼스를 극대화 시킬 수 있는 화물차 군집 운영전략을 수립할 수 있는 방안을 제시하였다. 운영효율성을 평가하기 위한 지표는 주행속도로 설정하였으며, 안전성 평가를 위해서 비자율차의 차량추종 관계 대비 상충상황에 노출되는 빈도를 나타내는 비자율차 상충률의 개념을 정의하여 적용하였다. 또한 분석결과를 이용하여 최적 군집운영 조건을 판단하는 방법론을 제시하였으며, 군집간간격이 50m이고 군집크기가 6대인 운영시나리오가 최적의 성능을 유도할 수 있음을 확인하였다. 본 연구에서 제시한 운영전략 수립 방안에 따라 운영효율성과 안전성을 고려한 교통상황별 적정 군집주행 파라미터를 도출할 수 있으며, 이는 군집운영 전략을 지원할 수 있는 자료로 활용할 수 있을 것으로 기대된다. Vehicle platooning through wireless communication and automated driving technology has become realized. Platooning is a technique in which several vehicles travel at regular intervals while maintaining a minimum safety distance. Truck platooning is of keen interest because it contributes to preventing truck crashes and reducing vehicle emissions, in addition to the increase in truck flow capacity. However, it should be noted that interactions between vehicle platoons and adjacent manually-driven vehicles (MV) significantly give an impact on the performance of traffic flow. In particular, when vehicles entering from on-ramp attempt to merge into the mainstream of freeway, proper interactions by adjusting platoon size and inter-platoon spacing are required to maximize traffic performance. This study developed a methodology for establishing operational strategies for truck platoonings on freeway on-ramp areas. Average speed and conflict rate were used as measure of effectiveness (MOE) to evaluate operational efficiency and safety. Microscopic traffic simulation experiments using VISSIM were conducted to evaluate the effectiveness of various platooning scenarios. A decision making process for selecting better platoon operations to satisfy operations and safety requirements was proposed. It was revealed that a platoon operating scenario with 50m inter-platoon spacing and the platoon consisting of 6 vehicles outperformed other scenarios. The proposed methodology would effectively support the realization of novel traffic management concepts in the era of automated driving environments.
A Review of Korean Mental Health Studies Related to Trauma and Disasters
JungBum Kim,SeolYoung Ryu,Hyunnie Ahn 대한신경정신의학회 2005 PSYCHIATRY INVESTIGATION Vol.2 No.2
This article reviews the findings from the studies on disasters and Posttraumatic stress disorder (PTSD) conducted during the last decade in Korea. Forty-five studies directly related to the psychological impact and stress from various types of disasters were selected through a literature search. We present prevalence/ incidence, risk factors and other variables related to disasters, the treatments, and case reports. Most of the studies have not yet systematically examined different types of disaster and trauma, and have strong methodological weaknesses. It is suggested that further systematic studies are greatly needed to understand the comprehensive aspect of disaster and PTSD, especially focusing on the epidemiology, child and adolescent victims, biological aspects, pharmacotherapy, and psychological treatments.
Bra Cup Sizes Using 3D Body Scan Manual Measurements
Jongsuk Chun,Seolyoung Oh 대한인간공학회 2011 대한인간공학회 학술대회논문집 Vol.2011 No.10
Objective: This study aims to examine the brassiere cup sizing system using direct measurements of 3D body scan data. Background: Breast shape has complex curving surface so that the methods of breast size measurement have many measurement error and consumers have problems for finding proper bra size. But 3D body scanner supplies the new ideal data for women's breast circumference measurement. This study developed 3D manual measurement method. Method: 32 women's 3D body scan data were selected in Size Korea. 3D scan data were measured in three methods. (1)2D direct measurement. (2)3D automatic measurement. (3)3D manual measurement. 3D body scan data sliced in horizontal lines were measured by AutoCAD program. Results: The t-test results of chest girth, bust girth and bra cup size showed significant difference between 2D direct measurements and 3D automatic measurements. Bra cup sizes by 3D automatic measurements were larger than 2D direct measurements, whereupon some subjects were classified as wrong bra sizes. Conclusion: The method using slice line along body surface (A line) was more useful to determine bra cup sizes than the method using simplified surface line (B line). Application: The 3D manual method can be used for measuring bra cup size.