• 아동학회지
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• 제38권2호
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• pp.81-91
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• 2017

Objective: The purpose of this study was to identify the longitudinal relationship between child maltreatment and adolescent suicidal ideation. Several studies suggest that child maltreatment is associated with adolescent suicidal ideation. However, these studies have not focused on the duration of child maltreatment. Methods: Participants were 420 adolescents (52.6% male; 47.4% female) involved in the Korea Welfare Panel Study. Data were collected via youth self-report in 2006, 2009, and 2012. A self-report assessment of children and youths' experiences of physical, emotional, or neglect had been surveyed longitudinally. Questionnaires on adolescent suicidal ideation were answered in 2012. A growth mixture model and multiple regression were conducted using Mplus 5.21. Results: The study results showed that 93.5% of the children had experienced no maltreatment; 6.5% had experienced increasing maltreatment longitudinally. The trajectory of increasing maltreatment was positively associated with adolescent suicidal ideation. Conclusion: These results show that children suffering from chronic maltreatment are subject to a high risk of suicide and therefore require continuous supervision and management.

• 사회복지연구
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• 제49권3호
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• pp.209-245
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• 2018

본 연구는 인증 사회적기업의 경제적 사회적 성과지표를 활용하여 유형화를 시도하고, 통계적 적합도 지수를 통해 성과별 유의한 잠재유형을 탐색하는 것이 목적이며, 성과 유형간 조합을 분석하였다. 연구대상은 조상미 외(2011) 연구에 참여한 사회적기업 중 현재까지 운영되고 있는 기업이며 2011년 이후 6년간의 성과를 조사하여 분석하였다. 사회적기업의 경제적 성과인 매출액의 변화유형을 탐색한 결과 잠재유형이 세 개인 최적 모형을 도출하였으며 '매출성숙형', '매출증가형', '매출평균형'으로 명명하였다. 이때 매출평균형이 가장 많은 분포를 보이며, 운영기간이 타유형에 비해 짧은 것으로 나타났다. 사회적 성과인 취약계층고용율의 경우 세계의 최적모형이 탐색되었다, '고용평균형', '고용감소형', '고용증가형'으로 분류되었다. 사회적 성과는 고용평균형이 가장 많이 나타났으며, 다른 유형에 비해 매출액이 높은 것이 특징이다. 또한 사회적기업 경제적 성과의 변화유형에 따른 사회적 성과 변화유형의 분포인 $3{\times}3$의 교차유형을 살펴보았다. 교차유형에서는 '매출평균형 고용평균형', '매출평균 고용감소형'이 주를 이룬다. 이를 통해 사회적기업의 유형의 특징을 알아보고 지원 제도의 현실성 제고를 위한 정책 제안과 실행에 있어 필요한 시사점을 제시하였다.

• 한국노년학
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• 제39권1호
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• pp.37-60
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• 2019

이 연구는 한국 노인들의 노화과정을 추적해 노화의 궤적을 도출하고, 그 특성을 파악하고자 시도된 것이다. 특별히 연구는 Rowe와 Kahn이 제시한 성공노화모델을 분석틀로 삼고, 집단중심 다중궤적모형을 활용해 귀납적 방식으로 노화궤적을 도출하였다. 또한 주요 인구사회적 특성들을 기본 예측요인으로 삼아 각 노화궤적의 특성들을 다항로지스틱 분석으로 파악하고자 했다. 분석을 위해 활용된 자료는 고령화연구패널(KLoSA)의 1~6차 조사자료이며, 분석대상은 65세이상 74세이하의 전기노인 2,682명이다. 다중궤적모형에 활용된 분석지표는 만성질환, 신체기능, 인지기능, 우울증상, 그리고 사회참여활동이다. 분석을 통해 도출된 노화궤적은 5개이며, 각각은 5개 지표의 변화양상에 따라 일반노화군(33.9%), 경도인지장애동반군(22.1%), 건강기능저하군(18.2%), 성공노화군(17.8%), 병적노화군(7.9%)로 명명되었다. 한편, 다항로지스틱분석을 실시한 결과 일반적으로 성공 노화는 남성, 저연령, 고학력, 고소득, 유배우자 집단이 경험할 가능성이 컸다. 반면, 저학력, 저소득, 그리고 고연령의 경우 상대적으로 어려운 노화의 과정을 겪을 가능성이 컸다. 특히, 경도인지장애동반노화를 겪을 가능성은 배우자가 없는 저학력, 저소득, 그리고 고연령 여성에게서 크게 나타났다.

• 대한임베디드공학회논문지
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• 제12권5호
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• pp.277-286
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• 2017

This paper introduces mathematical modelling and control algorithm of expendable mine disposal vehicle. This vehicle has two longitudinal thrusters, one vertical thruster and internal mass moving system which can control pitch rate. Also, the vehicle has an optical camera and forward looking sonar for underwater mine detection and classification. The vehicle is controlled via an optical cable connected with operating console on the mother ship. We describe the vehicle's 6DOF dynamic model and controller which can track the desired trajectory for the way-point tracking. These simulation results shows guidance and maneuvering performance which has other sensor data or not.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 추계학술대회 논문집
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• pp.69-70
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• 2013

By using differential force between left and right wheel, lateral motion can be controlled known as Direct Yaw-moment Control (DYC). In previous researches, DYC control is proposed to increase the stability of the vehicle, but maneuverability has not been discussed sufficiently. The car handling condition which is called the index parameter of maneuverability is dependent on the vehicle velocity and steering angle. To achieve the desired vehicle's cornering path, the car handling condition must be considered sufficiently. In this paper, the novel DYC method is proposed which gives the car handling condition regardless of the longitudinal speed. The proposed controller is based on the PI controller to feedback the curvature parameter. The controlled system shows the advantages of DYC regarding to the reference trajectory by the dual motor system. With respect to the uncontrolled model, the effectiveness of the proposed method is validated by numerical examples.

• 한국자동차공학회논문집
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• 제4권2호
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• pp.209-220
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• 1996

In this paper, dynamic performance of 4WD/4WS Electric-driven vehicles is investigated. A coupled dynamic model is introduced for longitudinal, lateral and yawing motion of 4WD/4WS vehicles. Based on the coupled model, dynamic performance is analyzed for steady-state steering, acceleration steering and brake steering, respectively. These non steady-state cornering analysis is important for non-paved road maneuvering, trajectory projection for armored vehicle and future AVCS(Advanced Vehicle Control System) technology. Simulation results are obtained based on a simulink module for the introduced model.

• 한국전기전자재료학회논문지
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• 제21권1호
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• pp.49-52
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• 2008

In this study, multilayer structured ultrasonic linear motor was simulated using Atila for investigating its optimum driving conditions. The ultrasonic linear motors mainly consist of an ultrasonic vibrator to generate elliptical displacement. The ultrasonic linear motor simulated in this paper was the use of the 1st longitudinal(Ll) and 4th bending vibrations (B4). Whit the increase of the number of piezoelectric actuator layers, displacement of node was increased. Maximum total displacement of node was about $3,91{\mu}m$ at the 13 layered ultrasonic motor under 5 V.

• 한국자동차공학회논문집
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• 제9권2호
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• pp.152-167
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• 2001

Recently safety systems for the commercial vehicle have been rapidly developed. However, we still have many problems in the vehicle stability and the braking performance. Especially, a commercial vehicle may meet a dangerous braking condition when the vehicle is lightly loaded or empty and when the road is wet or slippery. Under these conditions, the truck can spin out or the tractor can jackknife or the trailer can swing out. To design the air brake system for the commercial vehicle, since the air brake system has many design variables, there must have been intensive researches on a method how to prevent dynamic instability and how to maximize the vehicle deceleration. In this study, mathematical models about the tractor-semitrailer and the air brake system including an ABS controller have been constructed for computer simulation. Also, simple examples are applied to show the usefulness of the program. Designers can use this simulation program for understanding the braking characteristics such as trajectory, braking distance, longitudinal deceleration, lateral deceleration, and yaw rate on various road conditions.

• International Journal of Aerospace System Engineering
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• 제2권2호
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• pp.73-78
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• 2015

According to the characteristic of carrier-based aircraft, the method of solving safe set during arresting landing is discussed in this paper based on optimal control and invariant set theory. The safe sets of carrier aircraft are evaluated in different states on the characteristic of longitudinal augmented system by using the level set method. Then, the influence on the boundary of safe set under various factors is analyzed. At last, the maneuverability envelope protection is established based on the corresponding theory, and the validity of the system is verified through simulation. The results demonstrate preliminarily that: compared with mass and thrust, the elevator is the greatest influence factor for the boundary of safe set; the dynamic trajectory of carrier-based aircraft can be located at the interior of safe set effectively with the maneuverability envelope protection.

• 아동학회지
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• 제27권3호
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• pp.169-187
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• 2006

A hierarchical linear model(HLM) provides advantages over existing traditional statistical methods (e.g., ordinary least squares regression, repeated measures analysis of variance, etc.) for analyzing multilevel/longitudinal data or diary methods. HLM can gauge a more precise estimation of lower-level effects within higher-level units, as well as describe each individual's growth trajectory across time with improved estimation. This article 1) provides scholars who study children and families with an overview of HLM (i.e., statistical assumptions, advantages/disadvantages, etc.), 2) provides an empirical study to illustrate the application of HLM, and 3) discusses the application of HLM to the study of children and families. In addition, this article provided useful information on available articles and websites to enhance the reader's understanding of HLM.