• 한국심리학회지 : 문화 및 사회문제
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• 제21권2호
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• pp.131-158
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• 2015

본 연구는 체육시간이 청소년의 외현화(공격성) 및 내재화(사회적 위축, 우울) 문제에 어떠한 영향을 미치는지, 그리고 그 영향이 시간의 흐름과 성별에 따라 다른지에 대해 분석하였다. 분석 자료로 한국청소년정책연구원(NYPI)에서 실시하는 한국아동·청소년 패널조사(KCYPS)의 중학교 1학년 패널의 2차년도(2011) 데이터(N = 2,133), 3차년도(2012) 데이터(N = 2,151), 4차년도(2013)데이터(N = 1,979)를 활용하였다. 종속변수를 공격성, 사회적 위축, 우울로 설정하고, 독립변수를 성별, 체육시간으로, 통제변수를 학대, 학교적응, 가구연간소득, 보호자 최종학력으로 설정한 뒤 다층성장모형을 적용하여 변인간의 관계를 종단적으로 살펴 본 결과는 다음과 같다. 첫째, 공격성 및 사회적 위축에서 시간의 흐름에 따라 유의한 변화가 있었다. 둘째, 공격성 및 우울에서 성별 차이가 나타났다. 셋째, 체육시간은 우울 및 사회적 위축에만 부적인 영향을 주었다. 넷째, 외현화 및 내재화 문제 모두 시간에 대한 성별의 영향이 변하지 않았다. 다섯째, 시간에 대한 체육시간의 상호작용은 사회적 위축에서만 유의하게 나타났다. 여섯째, 우울에서 체육시간에 대한 성별의 상호작용이 통계적으로 유의하게 나타났다. 이와 같은 연구 결과는 체육시간이 중요하다는 정책적 방향을 제시함으로써 학교 체육시간의 증가를 도모할 수 있는 연구적 기반이 될 것으로 기대해 본다.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제18권4호
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• pp.230-237
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• 2015

Purpose: Various gastrointestinal factors may contribute to maladaptive behavior in children with autism spectrum disorders (ASD). To determine the association between maladaptive behavior in children with ASD and gastrointestinal symptoms such as severity, intestinal microbiota, inflammation, enterocyte damage, permeability and absorption of opioid peptides. Methods: This observational cross-sectional study compared children with ASD to healthy controls, aged 2-10 years. Maladaptive behavior was classified using the Approach Withdrawal Problems Composite subtest of the Pervasive Developmental Disorder Behavior Inventory. Dependent variables were gastrointestinal symptom severity index, fecal calprotectin, urinary D-lactate, urinary lactulose/mannitol excretion, urinary intestinal fatty acids binding protein (I-FABP) and urinary opioid peptide excretion. Results: We did not find a significant difference between children with ASD with severe or mild maladaptive behavior and control subjects for gastrointestinal symptoms, fecal calprotectin, urinary D-lactate, and lactulose/mannitol ratio. Urinary opioid peptide excretion was absent in all children. Children with ASD with severe maladaptive behavior showed significantly higher urinary I-FABP levels compared to those with mild maladaptive behavior (p=0.019) and controls (p=0.015). Conclusion: In our series, maladaptive behavior in ASD children was not associated with gastrointestinal symptoms, intestinal inflammation (no difference in calprotectin), microbiota (no difference in urinary D-lactate) and intestinal permeability (no difference in lactulose/manitol ratio). ASD children with severe maladaptive behavior have significantly more enterocyte damage (increased urinary I-FABP) than ASD children with mild maladaptive behavior and normal children.

• 한국가정과교육학회지
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• 제10권2호
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• pp.43-55
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• 1998

This study investigated the relationship between parental abuse and maladjustment per ceived by middle school student. The subjects were 448 middle school students in Kwangju. The main results of this study were as follows ; 1. There were found significant differences according to background variables in parental abuse and maladjustment. Physical abuse was found significantly different according to gender of the child and unreasonable rearing behavior of the parents, but emotional abuse was found significantly different according to job of the father and unreasonable rearing behavior of the parents. And, neglect was found significantly different according to educational level of the father and unreasonable rearing behavior of the parents. Social withdrawal was found significantly cliff erent according to gender of the child, family income and unreasonable rearing behavior of the parents, but hyperactivity was found significantly different according to gender of the child and unreasonable rearing behavior of the parents. Agression and retreat were found significantly different according to gender of the child and unreasonable rearing behavior of the parents. Obsessive-compulsion was found significantly different according to unreasonable_ rearing behavior of the parents. 2.There were significantly positive correlation between parental abuse and maladjustment. 3. The findings of multiple regression analysis demonstrated that neglect, physical abuse, family income, gender of child were found to be important variables in predicting social with drawal. Neglect, unreasonable rearing behavior of the parents, phsical abuse, gender of child were found to be important variables in predicting hyperactivity. Neglect, emotional abuse, and unreasonable rearing behavior of the parents were found to be important varialbes in predicting aggression. Gender of the child. emotional abuse, and unreasonable reanng behavior. of the parents were found to be important variables in predicting retreat. And, unreasonable rearlng behavior of the parents. neglect. and physical abuse were f ouod to be Importan variabJes in predicting obsessive-compulsion.lsion.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2003년도 Proceeding
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• pp.141-148
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• 2003

Customer retention is a common concern for many industries and a critical issue for the survival in today's greatly compressed marketplace. Current customer retention models only focus on detection of potential defectors based on the likelihood of defection by using demographic and customer profile information. In this paper, we propose a dynamic procedure for defection detection and prevention using past and current customer behavior by utilizing SOM and Markov chain. The basic idea originates from the observation that a customer has a tendency to change his behavior (i.e. trim-out his usage volumes) before his eventual withdrawal. This gradual pulling out process offers the company the opportunity to detect the defection signals. With this approach, we have two significant benefits compared with existing defection detection studies. First, our procedure can predict when the potential defectors could withdraw and this feature helps to give marketing managers ample lead-time for preparing defection prevention plans. The second benefit is that our approach can provide a procedure for not only defection detection but also defection prevention, which could suggest the desirable behavior state for the next period so as to lower the likelihood of defection. We applied our dynamic procedure for defection detection and prevention to the online gaming industry. Our suggested procedure could predict potential defectors without deterioration of prediction accuracy compared to that of the MLP neural network and DT.

• 대한가정학회지
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• 제41권7호
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• pp.121-143
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• 2003

The purpose of this study was to show general trends in the psychological environment of family and problem behaviors perceived by adolescents and examine possible changes in such trends in accordance with the individual variables of adolescent, and then find out the effect of these variables on adolescents' problem behavior. The subject were 1374 adolescents of middle school in Busan(male 698, female 676). The main results were as follows : (1) General trends in the degree of parental monitoring showed that girls had more high than boys, and in the degree of family discord, boys showed more high than girls. In the degree of openness of parent-adolescent communication perceived by adolescents showed that girls had more open communication with mother than boys. Such trends in problem behaviors indicated that adolescents had the attention problem most. According to gender, girls had more problems in withdrawal, somatic complain, anxiety/depression, thought problems, attention problems, destructivity/identity, internalizing problems, total behavior problems in comparison to boys. Boys did delinquent behaviors more than girls. (2) For boys, the monthly income of their family, family discord, and the mother-adolescent communication have a significant direct effect on internalizing problems, externalizing problems and total behavior problems. Besides mother's employment and the type of family have a significant indirect effect on behavior problem. For girls, mother's employment, parental monitoring, family discord, and father-adolescent communication have a significant direct effect on internalizing problems. Mother's employment, family discord, mother-adolescent communication have a significant indirect effect on externalizing problems and total behavior problems. Bisides mother's employment, grade, the type of family, dating have a significant indirect effect on behavior problem. (3) The variables to have a significant influence on the parental monitoring showed as the monthly income of their family, dating, mother's employment, the type of family, the family discord showed as mother's employment on the parent-adolescent communication showed as the type of family. (4) Family discord was the most powerful predicator of problem behaviors of middle school students.

• 한국물환경학회지
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• 제35권6호
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• pp.470-480
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• 2019

The Doam lake watershed was designated as a non-point pollution management area in 2007 to improve water quality based on watershed management implementation. There have been studies of non-point source reduction with respect to the watershed management impacting the pollutant transport of the reservoir. However, a little attention has been focused on the impact of water quality improvement by the management of the dam operation or the guidelines on the dam operation. In this study, the impact of in-lake management practices combined with watershed management is analyzed, and the appropriate guidelines on the operation of the dam are suggested. The integrated modeling system by coupling with the watershed model (HSPF) and reservoir water quality model (CE-QUAL-W2) was applied for analyzing the impact of water quality management practices. A scenario implemented with sedimentation basin and suspended matter barrier showed decrease in SS concentration up to 4.6%. The SS concentration increased in the scenarios adjusting withdrawal location from EL.673 m to the upper direction(EL.683 m and EL.688 m). The water quality was comparably high when the scenario implemented all in-lake practices with water intake at EL.673 m. However, there was improvement in water quality when the height of the water intake was moved to EL.688 m during the summer by preventing sediments inflow after the rainfall. Therefore, to manage water quality of the Doam lake, it is essential to control the water quality by modulating the height of water intake through consistent turbidity monitoring during rainfall.

• Korea-Australia Rheology Journal
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• 제14권1호
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• pp.33-45
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• 2002

Recent results obtained for the port-pom model and the constitutive equations with time-strain separability are examined. The time-strain separability in viscoelastic systems Is not a rule derived from fundamental principles but merely a hypothesis based on experimental phenomena, stress relaxation at long times. The violation of separability in the short-time response just after a step strain is also well understood (Archer, 1999). In constitutive modeling, time-strain separability has been extensively employed because of its theoretical simplicity and practical convenience. Here we present a simple analysis that verifies this hypothesis inevitably incurs mathematical inconsistency in the viewpoint of stability. Employing an asymptotic analysis, we show that both differential and integral constitutive equations based on time-strain separability are either Hadamard-type unstable or dissipative unstable. The conclusion drawn in this study is shown to be applicable to the Doi-Edwards model (with independent alignment approximation). Hence, the Hadamardtype instability of the Doi-Edwards model results from the time-strain separability in its formulation, and its remedy may lie in the transition mechanism from Rouse to reptational relaxation supposed by Doi and Edwards. Recently in order to describe the complex rheological behavior of polymer melts with long side branches like low density polyethylene, new constitutive equations called the port-pom equations have been derived in the integral/differential form and also in the simplifled differential type by McLeish and carson on the basis of the reptation dynamics with simplifled branch structure taken into account. In this study mathematical stability analysis under short and high frequency wave disturbances has been performed for these constitutive equations. It is proved that the differential model is globally Hadamard stable, and the integral model seems stable, as long as the orientation tensor remains positive definite or the smooth strain history in the flow is previously given. However cautious attention has to be paid when one employs the simplified version of the constitutive equations without arm withdrawal, since neglecting the arm withdrawal immediately yields Hadamard instability. In the flow regime of creep shear flow where the applied constant shear stress exceeds the maximum achievable value in the steady flow curves, the constitutive equations exhibit severe instability that the solution possesses strong discontinuity at the moment of change of chain dynamics mechanisms.

• Nuclear Engineering and Technology
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• 제45권6호
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• pp.721-730
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• 2013

Within the framework of the ASTRID project, core design studies are being conducted by the CEA with support from AREVA and EDF. The pre-conceptual design studies are being conducted in accordance with the GEN IV reactor objectives, particularly in terms of improving safety. This involves limiting the consequences of 1) a hypothetical control rod withdrawal accident (by minimizing the core reactivity loss during the irradiation cycle), and 2) an hypothetical loss-of-flow accident (by reducing the sodium void worth). Two types of cores are being studied for the ASTRID project. The first is based on a 'large pin/small spacing wire' concept derived from the SFR V2b, while the other is based on an innovative CFV design. A distinctive feature of the CFV core is its negative sodium void worth. In 2011, the evaluation of a preliminary version (v1) of this CFV core for ASTRID underlined its potential capacity to improve the prevention of severe accidents. An improved version of the ASTRID CFV core (v2) was proposed in 2012 to comply with all the control rod withdrawal criteria, while increasing safety margins for all unprotected-loss-of-flow (ULOF) transients and improving the general design. This paper describes the CFV v2 design options and reports on the progress of the studies at the end of pre-conceptual design phase 1 concerning: - Core performance, - Intrinsic behavior during unprotected transients, - Simulation of severe accident scenarios, - Qualification requirements. The paper also specifies the open options for the materials, sub-assemblies, absorbers, and core monitoring that will continue to be studied during the conceptual design phase.

• The Korean Journal of Pain
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• 제19권2호
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• pp.137-141
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• 2006

Background: It has been known that melatonin is involved in the modulation of nociceptive transmission. However, the effect of melatonin administered spinally has not been examined. Therefore, we examined the effect of melatonin on the formalin-induced or thermal-induced nociception at the spinal level. Methods: Intrathecal catheter was inserted into the subarachnoid space of male Sprague-Dawley rats. Pain was assessed by formalin test (induced by injection of $50{\mu}l$ of a 5% formalin solution to the hindpaw) or Hot-Box test (induced by radiant heat application to the hindpaw). The effect of intrathecal melatonin was examined on flinching behavior in the formalin test or withdrawal response in Hot-Box test. Results: Intrathecal melatonin produced a limited, but dose-dependent reduction of the flinching response during phase 1 and 2 in the formalin test. In addition, melatonin delivered at evening also decreased the flinching response in both phases of the formalin test. Melatonin restrictively increased the withdrawal latency in Hot-Box test. Conclusions: These results suggest that melatonin is active against the formalin- and thermal-induced nocicpetion at the spinal level, but the effect is limited.

• 대한한방내과학회지
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• 제22권2호
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• pp.239-243
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• 2001

Alcoholism is a chronic behavior disorder that disturbs the health, social, and economical functions by intaking alcohol repeatedly. Alcoholism includes some habituation, dependency, and addiction. It may be clinically silent or severe enough to lead to the rapid development of hepatic, renal and gastrointestinal failure. Alcoholism can also cause death. In this case, we administrated saenggangunbitang and sungjoocheonggantang to a patient suffering from alcohoism and its withdrawal symptoms. After administration of saenggangunbitang-sungjoocheonggantang medication, clinical symptoms, including liver function with diabetes mellitus and splenomegaly improved. saenggangunbitang-sungjoocheonggantang showed desirable effect on alcoholism symptoms.