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차동혁 ( Dong Hyuk Cha ),옥선화 ( Sun Wha Ok ) 대한가정학회 2014 Human Ecology Research(HER) Vol.52 No.5
Focusing on the holistic concept of health, which embraces both physical and mental health, we investigated the effects of parenting and community factors on the health of 1,248 first- and second-year middle school students, on the basis of the data of the Korean Survey on the Activities and Culture of Youth and Children in 2009. The latent class analysis revealed three types of holistic health groups from the data, named as follows: (1) the healthy group, (2) moderate group, and, (3) fragile group. Then, we analyzed the effects of parenting factors and community safety on these health types according to the students` year in school and their mother`s status of employment. The results showed that the first-year students had consistent parenting effects on their own type of health, while the safety of the community only partly contributed to the probability of affiliation to healthier types. However, in the case of the second-year students, a neglectful parenting style and community safety consistently had significant effects on the students` type of health, while parental concern about an adolescent`s health did not contribute to the probability of affiliation to healthier types when only the mother was unemployed. The discussion considers how these results provide basic resources for formulating policies and creating intervention programs for addressing the health problems of adolescents.
차동혁(Dong Hyuk Cha),조형석(Hyung Suck Cho) 대한전자공학회 1992 대한전자공학회 학술대회 Vol.1992 No.10
In this paper, an unilateral teleoperation system using an universal master arm is developed. This system is composed of an universal master arm, a slave arm and a telerobot controller. The universal master arm has a vertically articulated type link structure, while an industrial robot is used as a slave arm. As the shapes of master arm and slave arm are different, the workspace mapping is needed, which maps the workspace of master arm to that of slave arm. Experimental results show that the slave arm of the developed system effectively follows the operator's motion.
슬관절 전치환술 후 발생한 대퇴골 삽입물 주위 골절의 이중 금속판 고정술
김동휘(Dong Hwi Kim),차동혁(Dong Hyuk Cha),고강열(Kang Yeol Ko) 대한정형외과학회 2021 대한정형외과학회지 Vol.56 No.1
목적: 슬관절 전치환술 후 발생한 대퇴 삽입물 주위 골절에 이중 금속판을 이용한 고정술 후 결과를 평가하고자 한다. 대상 및 방법: 2007년 10월부터 2013년 2월까지 슬관절 전치환술 후 발생한 대퇴골 삽입물 주위 골절 23예 중 Lewis와 Rorabeck의 분류상 II형으로 삽입물 이완은 없으나 과상부 분쇄골절이거나 골절선이 외상과까지 연장됐거나 주대(stem)가 있어 편측 고정만으로 골절부의 안정성을 얻을 수 없다고 판단한 경우에 내, 외측 이중 금속판을 이용하여 내고정술을 시행하고 최소 1년 이상 추시가 가능했던 13예를 대상으로 하였다. 환자의 평균 연령은 72세(65–82세)였고 여자가 11예, 남자가 2예였다. 수상 기전은 낙상이 9예, 교통사고가 4예였다. 류마티스관절염 1예를 제외하고 12예에서 골관절염으로 슬관절 전치환술을 받았고 3예에서 재치환술 등의 이유로 주대가 있었다. 슬관절 전치환술 후 골절 발생까지의 평균 기간은 28개월(1–108개월)이었고, 술 전 환자의 평균 골밀도는 T score -3.2 (-1.7에서 -4.4)였으며, 평균 추시기간은 23개월(12–65개월)이었다. 수술법은 골절부의 내측에 먼저 광근 하방으로 접근하여 해부학적 정복을 시행하고 금속판으로 내고정을 시행한 후 추가로 외측에 최소 절개법을 통해 잠김 압박 금속판을 사용하여 내고정하였다. 골유합 기간 및 합병증, 최종 추시 시 Hospital for Special Surgery Knee Score (HSS)를 평가하였다. 결과: 평균 골유합 기간은 17.4주(7–40주)였으며 2예에서 지연 유합이 발생하였으나 추가적 수술 없이 36주와 40주에 골유합을 얻었다. 1예에서 불유합이 발생하여 재고정술 및 자가골 이식술을 시행 후 3개월에 완전한 골유합을 얻었다. 최종 추시 시 전후방 각형성은 평균 2.86도(0–4.9도), 내외반 각형성은 평균 1.67도(-1.2–4.9도)로 전체 예에서 부정 유합은 없었다. 최종 추시 시 슬관절 운동 범위는 평균 90도였고, HSS 점수는 평균 85점(70–95점)이었다. 결론: 슬관절 전치환술 후 발생한 대퇴골 삽입물 주위 골절 시 편측 고정만으로 골절부의 안정성을 얻을 수 없는 경우 이중 금속판을 이용한 내고정술은 안정적인 고정으로 빠른 재활이 가능하고 임상적으로 양호한 결과를 얻을 수 있는 방법으로 생각된다. Purpose: This study evaluated the results of dual plate fixation for periprosthetic femur fracture after total knee arthroplasty (TKA). Materials and Methods: From October 2007 to February 2013, 23 cases of periprosthetic femur fracture after TKA were treated at the author’s hospital. There were 13 cases of fixation using a medial and lateral dual plate when the stability of the fracture site could not be achieved by one side fixation with a follow-up of more than one year. The cases included no loosening of the femoral component in fractures that were categorized as Lewis–Rorabeck classification II and supracondylar comminuted fractures and elongation of the fracture line to the lateral epicondyle of the femur or stem in the medullary canal. The mean age was 72 years (65–82 years), and 11 cases were female. Three cases had a stem due to revision. The mean bone marrow density was -3.2 (-1.7 to -4.4), and the mean period from primary TKA to periprosthetic fractures was 28 months (1–108 months). The mean follow-up period was 23 months (12–65 months). The medial fracture site was first exposed via the subvastus approach. Second, the supplementary plate was fixed on the lateral side of the fracture using a minimally invasive plate osteosynthesis technique. The average union time, complications, and Hospital for Special Surgery Knee Score (HSS) at the last follow-up were evaluated. Results: The mean union time was 17.4 weeks (7–40 weeks). Two cases showed delayed bone union and nonunion occurred in one case, in whom bone union was achieved three months later after re-fixation using a dual plate with an autogenous bone graft. The mean varus-valgus angulation was 1.67 degrees (-1.2–4.9 degrees), and the mean anterior-posterior angulation was 2.86 degrees (0–4.9 degrees) at the last follow-up. The mean knee range of motion was 90 degrees, and the HSS score was 85 points (70–95 points) at the last follow-up. Conclusion: Dual plate fixation for periprosthetic femur fractures that had not achieved stability by one side plate fixation after TKA showed a good clinical result that allowed early rehabilitation.
미세피치 연성인쇄회로기판 대응을 위한 NCP 패키징 공정설계 및 분석
심재홍(Jae Hong Shim),차동혁(Dong Hyuk Cha) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.2
Recently, LCD (Liquid Crystal Display) requires various technical challenges; high definition, high quality, big size, and low price. These demands more pixels in the fixed area of the LCD and very fine lead pitch of the driving IC which controls the pixels. Therefore, a new packaging technology is needed to meet such technical requirement. NCP (Non Conductive Paste) is one of the new packaging methods and has excellent characteristics to overcome the problems of the ACF (Anisotropic Conductive Film). In this paper, we analyzed the process of the NCP for COF (Chip on FPCB) and proposed the key design parameters of the NCP process. Through a series of experiments, we obtained the stable values of the design parameters for successful NCP process.
저가형 적외선 거리 센서를 이용한 선도-추종 로봇 시스템에서 선도로봇의 위치인식
바르토야(Battuya Sanjaakhand),장문석(Moon-Suk Jang),차동혁(Dong-Hyuk Cha) 한국전기전자학회 2020 전기전자학회논문지 Vol.24 No.1
본 연구에서는 저가형 소형 이동로봇을 이용한 선도-추종 로봇시스템을 개발하였다. 개발한 이동로봇은 시중에서 쉽게 구할 수 있는 저렴한 부품을 사용하여 학교나 실험실 등에서 쉽고 빠르게 제작할 수 있는 장점이 있다. 그리고 이 로봇에 장착된, 7개의 저가형 적외선 거리 센서로 구성된 센서 어레이의 위치인식 특성을 분석하고, 이를 기반으로 선도로봇의 위치인식 알고리즘을 제안하였다. 개발한 선도-추종 로봇을 이용한 정지 및 주행 실험을 통해 제안된 알고리즘의 타당성을 검증하였다. A leader-follower robot system using low cost small mobile robots has been developed. Sine the developed mobile robot is made of widely used low cost parts, it can be built easily and fastly. Characteristics of the developed sensor array composed of seven low-cost infrared(IR) distance sensors has been investigated, and a positioning algorithm of the reader robot is proposed. Through a series of experiments, it has been verified that the proposed algorithm can detect the position of the reader robot well.
이하나(Ha-Na Lee),김기태(Gi-Tea Kim),정광현(Kwang-Hyeon Chung),차동혁(Dong-Hyuk Cha),정명진(Myung-Jin Chung) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this study, we propose an image processing position control system for 90-degree delta robot with four actuators. The robot places four actuators arranged at 90-degree to solve the problem of overloading the motor of the conventional 120 degrees delta robot. Inverse kinematics was used to move the delta robot in its exact location. Image processing can be used to control the position of the end effector of the delta robot. For image processing, position of the webcam at a 70-degree angle at 32cm height. The system allows us to determine the position, color, and slope of shapes. The measuring area is 30cm wide and 20cm long. The area that can be driven by image processing is the same as the measurement area. The operation of the proposed delta robot was confirmed, and the operation experiment was carried out.