Seungyeon Lee

An Ecological Understanding of Youth Suicide in South Korea.

This article reviews risk factors for youth suicide in South Korea (hereafter referred to as Korea), based on the ecological systems theory. Although youth suicide is a major concern for Korean society, understanding of this phenomenon has been limited since most of the empirical studies address personal characteristics without much consideration to larger environmental contexts for Korean adolescents. This review integrates many empirical findings on Korean adolescents’ suicidal ideation or behaviours within the context of micro-, meso-, exo-, macro-, and chrono-systems that surround an individual. Finally, it draws implications on assessment and intervention strategies for youth suicide that school psychologists and other mental health professionals in Korean schools can utilize.

A journey to a close, secure, and synchronous relationship: Infant–caregiver relationship development in a childcare context

In this qualitative study, the relationship development process of three infant–caregiver dyads in a university-affiliated childcare setting was explored and some contributing factors to the development were identified. Data were collected through multiple methods (observations, video recordings, interviews, documents) for a semester. The findings of this study reveal both common and unique patterns of relationship development. In general, it took about 6 to 11 weeks to build firm relationships in the supportive context. Yet, the time and opportunity that they had together, what they brought with them (e.g. personalities, relationship histories), and their match brought about differences. In addition, the infant–caregiver relationship was two-way and reciprocal, and the context had a significant impact on the development. This study supports the significance of the infant–caregiver relationship in high-quality infant educare and caregiver education and sheds light on the necessity of a process-oriented and holistic perspective on infant–caregiver relationship development.

The 3-Bit Gray Counter Based on Magnetic-Tunnel-Junction Elements

A magnetic-tunnel-junction (MTJ) element has been widely studied for data storage applications. An MTJ element can also be used to compute Boolean functions and store the output result. A magnetologic device based on this MTJ element can constitute sequential logic functions as well as combinational logic. Counter is one of the most frequently used sequential logic blocks in digital logic systems. In this paper, a novel architecture of a 3-bit gray counter based on magnetologic elements is presented. It is shown that ten MTJ elements with complementary metal-oxide-semiconductor (CMOS) circuits for sense amplifier and writing-current driver can make a 3-bit gray counter. HSPICE simulation results are presented to verify the functionality of the proposed circuits

Magneto-Logic Device Based on a Single-Layer Magnetic Tunnel Junction

A magnetic tunnel junction (MTJ) element can compute Boolean functions and also store the output of its last operation. Therefore, the MTJ shows potential for a universal logic element to implement sequential-logic functions as well as combinatorial ones. The established magneto-logic element has been designed and fabricated based on a triple-layer MTJ. We present a novel magneto-logic structure that consists of a single-layer MTJ and a current driver, which requires less processing steps with enhanced functional flexibility and uniformity.

A Full Adder Design Using Serially Connected Single-Layer Magnetic Tunnel Junction Elements

Magnetic tunnel junction (MTJ) elements based magnetologic promises many advantages over conventional CMOS logic devices. MTJ elements can be configured by simple circuitry to compute various Boolean functions and store the results. Advantages of magnetologic include low power consumption, the possibility of high-speed operation, and high density. We have proposed a novel magnetologic structure comprising a single-layer MTJ and a current driver, which requires fewer processing steps and provides enhanced functional flexibility and uniformity. Here, we expand the computational capabilities of single-layer MTJs, using series connections. An algorithm that realizes complex Boolean functions with fewer magnetologic elements than previous papers is presented.

Reasons for Living and Their Moderating Effects on Korean Adolescents' Suicidal Ideation

The present study validated the use of the Korean version of the Reasons for Living Inventory for Adolescents (KRFL-A) in a group of 406 South Korean high school students. Confirmatory factor analysis confirmed the original 5-factor structure, and other psychometric properties demonstrated the usefulness of the KRFL-A as a measure of cognitive protective factors. Hierarchical regression analyses revealed that the KRFL-A total significantly moderated the impact of depressive symptoms on suicidal ideation. More specifically, the Family Alliance subscale among boys and the Peer Acceptance and Support subscale among girls moderated the relationships between depressive symptoms and suicidal ideation. This suggests that for Korean adolescents, gender-specific strategies are needed for more effective suicide interventions.

Preparing Early Childhood Professionals for Relationship-Based Work with Infants.

This qualitative multicase study explored the process through which three student caregivers engaged in relationships with key infants in the context of an infant practicum course as a foundation for learning about infant development and practice. Focusing on caregiver–infant dyads, data sources included videotaped observations of caregiver–child interactions across three time points in a semester, and student caregivers’ weekly reflective notebooks and assignments. Findings from this study revealed the power and value of relationships as an essential context for learning about infant development, infant care and education, and preparation of infant professionals. Ample time and supported opportunities to develop authentic relationships with infants and their families, and a framework for reflection on relationships and practice were provided through a well-constructed and supervised infant practicum, which is recommended for both early childhood preservice students and those preparing for related disciplines. Our findings suggest that infant caregiving provides valuable professional knowledge which can be applied across the early childhood continuum.

Primary Caregiving as a Framework for Preparing Early Childhood Preservice Students to Understand and Work with Infants.

ABSTRACT Research Findings: This qualitative study explored the process through which a small group of preservice early childhood teachers engaged in primary caregiving as a framework for learning about early care and education with infants during an infant practicum course at a university-affiliated early childhood center in the United States. Based on multiple data sources, findings revealed that the participants found the primary care system to be beneficial to both infants and teachers. The student teachers gained a better understanding of the uniqueness of the infancy period, experienced the emotional rewards of a special relationship with an infant, and learned to provide individualized and relationship-based infant care and education, while the infants received the benefits of this care. The integration of hands-on practice enacting a primary care system in a responsive infant room, ongoing supervision, and a theory-to-practice seminar created an effective professional learning process for the student teachers, which helped them to grow as both infant teachers and early childhood professionals. Practice or Policy: These findings are a 1st step toward looking more deeply at 1 strategy as a promising practice for the future, offering implications for early childhood teacher education and new insight to the field.