• 한국보육지원학회지
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• 제15권6호
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• pp.21-40
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• 2019

Objective: The purpose of this study is to find the tendencies and differences of mother's child-rearing anxiety before and after their children enter into elementary school, to analyze the factors influencing child-rearing anxiety at each time, and thereby to seek a support plan at the time of transition. Methods: The subjects of this study were 181 mothers who participated in two surveys which were conducted before and after their child entered into elementary school. Results: Firstly, mother's child-rearing anxiety before and after their children's entrance into elementary school was at a middle level, but increased significantly when they experienced their children's transition to elementary school. Secondly, mother's child-rearing anxiety, before their children's entrance into elementary school, was influenced by private education, the collection of educational information, cognitive ability, whether or not to develop a work status change plan, and birth order sequentially. Thirdly, child-rearing anxiety after their children's entrance into elementary school was significantly influenced by child-rearing anxiety before their children's entrance into elementary school and the mother's employment. Conclusion/Implications: This study is meaningful in the point that it suggested the necessity for the cooperation between multiple systems, such as systematic and stepwise parenting education, the importance of offering information to educational institutions and local governments, and for work- family support policy to prioritize children in order to support children's successful transition into elementary school.

• Asian Pacific Journal of Cancer Prevention
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• 제16권8호
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• pp.3167-3172
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• 2015

Background: Understanding the history of human papilloma virus (HPV) infection is important for interpretation of a positive HPV DNA screening test, future work-up and treatment. We investigated the transition of HPV DNA test results in Korean women, and analyzed the association of cytology result with transition type. Materials and Methods: We retrospectively reviewed annual HPV DNA test results for 5,274 subjects between January 2005 and December 2012. Each subject had a minimum of five annual tests over the eight-year period. Based on the pattern of results, the transition type for each subject was assigned to one of the following: negative, persistent, latent, transient, and unclassifiable. Associations of cytology results with the HPV DNA transition types, number of positive results, and the durations of positive results were also analyzed. Results: The proportion of abnormal cytology findings decreased in the following order of transition patterns: persistent, latent, transient, and negative. Among transient patterns, a duration of three years or more significantly correlated with cytology results of non-high grade squamous intraepithelial lesion (HSIL; p<0.001). In the persistent group, duration of five years or more correlated with both non-HSIL and HSIL (p<0.001). Latent group showed no correlation with duration. Irrespective of patterns, having five or more positive results was significantly associated with HSIL (p<0.001). Conclusions: Our findings may contribute to better understanding of HPV infection, interpretation of HPV DNA screening results, and prediction of prognosis according to transition type.

• 센서학회지
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• 제30권2호
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• pp.71-75
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• 2021

Recently, transition-metal-based hydroxide materials have attracted significant attention in various electrochemical applications owing to their low cost, high stability, and versatility in composition and morphology. Among these applications, transition-metal-based hydroxides have exhibited significant potential in supercapacitors owing to their multiple redox states that can considerably enhance the supercapacitance performance. In this study, nanostructured Ni-Mn double hydroxide is directly grown on a conductive substrate using an electrodeposition method. Ni-Mn double hydroxide exhibits excellent electrochemical charge-storage properties in a 1 M KOH electrolyte, such as a specific capacitance of 1364 Fg-1 at a current density of 1 mAcm-2 and a capacitance retention of 94% over 3000 charge-discharge cycles at a current density of 10 mAcm-2. The present work demonstrates a scalable, time-saving, and cost-effective approach for the preparation of Ni-Mn double hydroxide with potential application in high-charge-storage kinetics, which can also be extended for other transition-metal-based double hydroxides.

• Journal of Magnetics
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• 제16권4호
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• pp.408-412
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• 2011

We investigated theoretically the magnetic field dependence of the quantum optical transition of qusi 2-Dimensional Landau splitting system, in GaN and ZnO. We apply the Quantum Transport theory (QTR) to the system in the confinement of electrons by square well confinement potential. We use the projected Liouville equation method with Equilibrium Average Projection Scheme (EAPS). Through the analysis of this work, we found the increasing properties of the optical Quantum Transition Line Shapes(QTLSs) which show the absorption power and the Quantum Transition Line Widths(QTLWs) with the magnetic-field in GaN and ZnO. We also found that QTLW, ${\gamma}(B)_{total}$ of GaN < ${\gamma}(B)_{total}$ of ZnO in the magnetic field region B < 25 Tesla.

• 한국산학기술학회논문지
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• 제7권6호
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• pp.1425-1432
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• 2006

본 연구는 주5일수업제에 대하여 교사, 학생, 학부모가 어떠한 인식을 가지고 있는지 조사 분석하여 주5일수업제의 효율적인 운영 방안을 제시하는 데 그 목적이 있다. 연구결과, 주5일수업제의 효율적 운영을 위해서는 현재 시행되고 있는 주5일수업제의 운영 현황을 파악하여 주5일수업제에 알맞은 교육과정이 편성 운영될 수 있도록 하며, 지원체제 및 협력 관계의 실태와 문제점을 파악하여 인프라 구축 방안을 모색해야 할 것이다. 이는 과도기적 단계에서 현재 시행되고 있는 주5일수업제의 정착에 도움이 될 것이다.

• 한국유체기계학회 논문집
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• 제17권3호
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• pp.46-51
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• 2014

In this study, a numerical analysis methodology is studied to predict thermal and flow characteristics of C3X vane with internal cooling. Effects of turbulence models, transition models and viscous work term on temperature and pressure distributions on the vane surface are investigated. These optional terms have few effects on the pressure distributions over the vane surface. However, they have great influence on prediction of the temperature distributions on the vane surface. The combination of k-${\omega}$ based SST turbulence model, ${\gamma}$ transition model and viscous work term are better than RSM turbulence model on prediction of the surface temperature. The average temperature difference between CFD results and experimental results is calculated 2 % at the pressure side and 1 % at the suction side. Furthermore computing time of this combination is half of the RSM turbulence model. When k-${\omega}$ based SST turbulence model and ${\gamma}$ transition model with viscous work term are applied, more accurate predictions of thermal and internal flow characteristics of high pressure turbine are expected.

• 한국심리학회지:학교
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• 제16권3호
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• pp.283-313
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• 2019

본 연구의 목적은 대학-직장 이행과정에서 심리사회적 어려움에 개입할 수 있는 집단상담 프로그램을 개발하고 그 효과를 검증하는데 있다. 이를 위해 Schlossberg(1995)의 이행 모형을 기반으로 대학-직장 이행과정에서 요구되는 대처자원인 4S(상황지각, 자기지각, 지지자원, 전략)에 개입하기 위한 프로그램을 개발하고, 대학교 4학년 이상의 취업준비생 10명을 대상으로 프로그램을 실시하였다. 또한 프로그램 효과성 검증을 위해 이행대처자원, 대학-직장 이행의 심리사회적 어려움, 취업소진, 진로적응성의 수준을 프로그램 전, 후, 그리고 종결 1개월 후 시점에 수집하여, 취업준비행동 프로그램을 실시한 비교집단 10명, 무처치 통제 집단 11명과 그 수준을 비교하였다. 연구 결과, '대학-직장 이행을 위한 대처자원 향상 프로그램'에 참여한 실험집단은 이행대처자원과 대학-직장 이행의 심리사회적 어려움의 수준이 프로그램 전후로 유의미하게 변화하였으며, 이러한 변화는 종결 1개월 후 시점까지 유지되는 것으로 확인되어 프로그램의 효과성이 경험적으로 입증되었다. 반면, 취업소진과 진로적응성에서는 실험, 비교, 통제집단 모두에서 통계적으로 유의미한 변화가 나타나지 않았다. 이러한 결과를 바탕으로 본 연구에서 개발된 '대학-직장 이행을 위한 대처 자원 향상 프로그램'이 지니는 의의를 논의하였으며, 연구가 지니는 제한점과 더불어 추후 연구를 위한 제언을 제시하였다.

• 대한화학회지
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• 제65권2호
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• pp.145-150
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• 2021

The present study describes a hands-on experiment to help students understand the concept of phase change or phase transition and its application in a phase change material (PCM). PCMs are substances that have the capability of storing and releasing large amounts of thermal energy. They act as energy storage materials that provide an effective way to save energy by reducing the electricity required for heating and cooling. Lauric acid (LA) was selected as an example of the PCM. Students investigated the temperature change of LA and the temperature (of air) inside the test tube. The differences in the temperatures of the systems helped students understand how PCMs work. A one-group pretest and posttest design was implemented with 34 grade-11 students in science and mathematics. Students' understanding was assessed using a multiple-choice test and a questionnaire. The findings revealed that the designed activity helped students understand the concept of phase change and its application to materials for thermal energy storage.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2012년도 제38회 춘계학술대회논문집
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• pp.324-330
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• 2012

Dual bell nozzle is one of the most promising choices among the altitude adaptation nozzles. This facilitates having a forced, steady and symmetrical separation at lower altitudes and a controlled flow separation at the wall inflection point which prevents the generation of dangerous side loads. In order to ensure the attached flow in the second bell, a clear understanding of the flow transition is required. Hence the motivation of our study is to arrive at an optimum profile for the second bell, which allows a sudden and controlled transition. In this work, we designed the first bell using the conventional MoC and the second bell using an inverse MoC, imposing a pressure gradient constraint. A CFD analysis is also carried out. It is found that the separation point is near the inflection point within one fourth of the extension length or it is near the exit.

• 한국세라믹학회지
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• 제49권3호
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• pp.266-271
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• 2012

The effect of $Bi(Mg_{1/2}Sn_{1/2})O_3$ (BMS) modification on the crystal structure, ferroelectric and piezoelectric properties of $Bi_{1/2}(Na_{0.8}K_{0.2})_{1/2}TiO_3$ (BNKT) ceramics has been investigated. The BMS-substitution induced a transition from a ferroelectric (FE) tetragonal to a nonpolar pseudocubic phase, leading to degradations in the remnant polarization, coercive field, and piezoelectric coefficient $d_{33}$. However, the electric-field-induced strain was significantly enhanced by the BMS substitution-induced phase transition and reached a highest value of $S_{max}/E_{max}$ = 633 pm/V under an applied electric field of 6 kV/mm when the BMS content reached 6 mol%. The abnormal enhancement in strain was attributed to the field-induced transition of the pseudocubic symmetry to other asymmetrical structure, which was not clarified in this work.