초기 청소년기의 자살생각에 관한 종단 연구: 스트레스와 우울의 영향을 중심으로

서한나 한국심리학회 2011 한국심리학회지 일반 Vol.30 No.3

This study examined the effect of stress and depression on suicidal ideation in a longitudinal approach. A total of 2,267 students of the cohort data(from 10 to 14 year olds) who participated in the Korean Youth Panel Study(KYPS) were used. In order to fulfill the purpose of the study, first the growth pattern of stress, depression and suicidal ideation were analysed by Latent Growth Model(LGM). Second, Multivariate Latent Growth Model was used to find out the relationship of the three variables. The results of this study were as follows: First, it was found that the three variables showed a linear growth as time passed. Second, results indicated that the increase of stress and depression may lead to the increase of suicidal ideation through the adolescents' growth. Discussions are followed to suggest application of the study result in reference to the adolescents with suicide-related problems. 본 연구는 초기 청소년의 자살생각에 스트레스와 우울이 미치는 영향을 종단적 관점에서 규명하는 것을 목적으로 하였다. 이를 위해 초등학교 4학년 학생이 중학교 2학년으로 성장하는 과정에서 수집된 한국청소년패널조사(KYPS) 5개년도 종단자료를 활용하였으며 분석에 총 2,267명이 포함되었다. 연구문제로는 첫째, 시점변화에 따라 스트레스 수준, 우울, 자살생각 수준의 변화양상을 분석하고 둘째, 이러한 변화과정에서 스트레스와 우울이 자살생각에 영향을 미치는 경로를 규명하고자 하였다. 분석결과는 다음과 같다. 첫째, 잠재성장모형을 통해 세 변인 각각의 변화양상을 살펴본 결과, 초기 청소년의 스트레스, 우울, 자살생각은 꾸준히 증가하는 것으로 나타났다. 둘째, 다변량 잠재성장모형을 적용하여 종단적 관점에서 세 변인 간 관계를 살펴본 결과, 초기시점의 자살생각은 초기 우울수준이 직접적으로 영향을 주는 한편, 시간경과에 따라 나타나는 자살생각 증가는 초기 스트레스나 우울수준보다는 시간변화에 따라 나타나는 스트레스와 우울의 증가가 원인임을 알 수 있었다. 따라서 장기적 관점에서 심각한 자살행위로 이어질 수 있는 자살생각을 예방하기 위해서는 초기 우울 형성을 방지하는 것은 물론 스트레스와 우울에 대한 지속적인 관찰 및 그에 따른 적절한 개입이 중요함을 시사한다. 이외에도 연구결과를 토대로 본 연구의 의의와 시사점을 제한점 및 추후연구 제안과 함께 제시하였다.

세션 키 동의를 제공하는 상호인증 패스워드 인증 스킴에 대한 취약점 공격

서한나,최윤성 한국융합보안학회 2022 융합보안 논문지 Vol.22 No.4

Password authentication schemes (PAS) are the most common mechanisms used to ensure secure communication in open networks. Mathematical-based cryptographic authentication schemes such as factorization and discrete logarithms have been proposed and provided strong security features, but they have the disadvantage of high computational and message transmission costs required to construct passwords. Fairuz et al. therefore argued for an improved cryptographic authentication scheme based on two difficult fixed issues related to session key consent using the smart card scheme. However, in this paper, we have made clear through security analysis that Fairuz et al.'s protocol has security holes for Privileged Insider Attack, Lack of Perfect Forward Secrecy, Lack of User Anonymity, DoS Attack, Off-line Password Guessing Attack. 패스워드 인증 체계 (PAS)는 개방형 네트워크에서 안전한 통신을 보장하는데 사용되는 가장 일반적인 메커니즘이다. 인수분해와 이산 로그 등의 수학적 기반의 암호 인증 체계가 제안되고 강력한 보안 기능을 제공하였으나, 암호를 구성하는데 필요한 계산 및 메시지 전송 비용이 높다는 단점을 가지고 있었다. Fairuz et al.은 스마트 카드 체계를 이용한 세션 키 동의와 관련하여 인수분해 및 이산 로그 문제를 기반으로 한 개선된 암호 인증 프로토콜을 제안했다. 하지만 본 논문에서는 취약성 분석을 통하여, Fairuz et al.의 프로토콜이 Privileged Insider Attack, Lack of Perfect Forward Secrecy, Lack of User Anonymity, DoS Attack, Off-line Password Guessing Attack에 관한 보안 취약점을 가지고 있다는 것을 확인하였다.

높게 들뜬 toluene과 염소 분자의 충돌시 에너지 전달과 C-H 결합 해리에 대한 연구

서한나,이종백,이상권 全南大學校 師範大學 科學敎育硏究所 2015 科學敎育硏究誌 Vol.39 No.1

Inter- and intra-molecular energy transfer and bond dissociation of C-Hmethyl and C-Hring of the vibrationally highly excited toluene in the collision with Cl2 have been studied by use of classical trajectory procedures. The amount of energy loss by vibrationally highly excited toluene,-<ΔE>, is calculated with increasing the total vibrational energy of toluene, ET in the range of 3,000 to 25,000 cm-1. The energy loss shows the maximum at 25,000 cm-1, and thereafter gradually decreased. The vibrational relaxation of toluene contributed to the V→T energy transfer is a dominant pathway in toluene Cl2 collisions, and the →V energy transfer pathway is negligible because of the large disparity in their vibrational frequencies. The dissociation probabilities are low but rise exponentially with increasing the total vibrational energy to near dissociation threshold. The dissociation probability of C-Hmethyl is significantly higher than that of C-Hring under the total energy ET = 65,000 cm-1. However, the dissociation probability of C-Hring is rather higher than that of C-Hmethyl over ET = 65,000 cm-1 because the C-Hring dissociation is due to the intramolecular energy transfer, not by the direct intermolecular collision.

미생물 담체를 이용한 납 제거기작 모의를 위한 수학적 모델의 개발

서한나,이민희,왕수균,Seo, Hanna,Lee, Minhee,Wang, Sookyun 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.4

Biocarrier beads with dead biomass, Bacillus drentensis, immobilized in polymer polysulfone were synthesized to remove heavy metals from wastewater. To identify the sorption mechanisms and theoretical nature of underlying processes, a series of batch experiments were carried out and a mathematical model was developed to quantify the biosorption of Pb(II) by the biocarrier beads. A series of mass balance equations for representing mass transfer of metal sorbents in biocarrier beads and surrounding solution were established. Major model parameters such as external mass transfer coefficient and maximum sorption capacity, etc. were determined from pseudo-first-order kinetic models and Langmuir isotherm model based on kinetic and equilibrium experimental measurements. The model simulation displays reasonable representations of experimental data and implied that the proposed model can be applied to quantitative analysis on biosorption mechanisms by porous granular beads. The simulation results also confirms that the biosorption of heavy metal by the biocarrier beads largely depended on surface adsorption.

보드게임으로 체험하는 경제순환모형 : 이코노랜드

서한나 한국사회교과교육학회 2022 한국사회교과교육학회 학술대회지 Vol.2022 No.-

Selecting Appropriate Seedling Age for Restoration Using Comparative Analysis of Physiological Characteristics by Age in Abies koreana Wilson

서한나,채승범,임효인,한심희,Kiwoong Lee 강원대학교 산림과학연구소 2021 Journal of Forest Science Vol.37 No.4

The aim of this study was to investigate the sensitivity to environmental stress, and changes in the photosynthesis capacity in Abies koreana seedlings by age and to suggest the most effective age for restoration. To identify these physiological characteristics of A. koreana, the chlorophyll fluorescence and photosynthetic capacity of 1-, 2-, 3-, 5- and 6-year-old A. koreana seedlings were observed from June 2020 to June 2021. The maximum quantum efficiency of Photosystem II (Fv/Fm), a chlorophyll fluorescence measurement parameter, was strongly positively correlated with the monthly average temperature (1-year-old seedling: r=0.8779, 2-year-old seedling: r=0.8605, 3-year-old seedling: r=0.8697, 5-year-old seedlings: r=0.8085, and 6-year-old seedlings: r=0.8316). The Fv/Fm values were the lowest in winter (November 2020-March 2021). In addition, the Fv/Fm values of 1-, 2-, and 3-year-old seedlings in winter were lower than that of 5- and 6-year-old seedlings, while the Fv/Fm values in summer were relatively higher than those in winter. Further, the Fv/Fm values of seedlings of all ages decreased in August 2020, when the monthly average temperature was the highest. In particular, 1-year-old to 3-year-old seedlings showed Fv/Fm values less than 0.8. Further, the photosynthetic capacity measured in August 2020 increased with increasing seedling age. The analysis of variance results for summer Fv/Fm values showed significant differences in age-specific averages (p<0.05), and Duncan’s multiple range test showed significant differences between 5- and 6-year-old seedlings and 1-, 2-, and 3-year-old seedlings (p<0.05). These results suggested that the 5- and 6-year-old seedlings were less sensitive to environmental stress and showed better photosynthetic capacity than the 1-, 2-, and 3-year-old seedlings. Therefore, 5-year-old or older A. koreana seedlings can be used as restoration materials because they can show increased adaptability and stable growth during transplantation due to their relatively high environmental resistance and photosynthetic capacity.

Promiscuous Trans-splicing Activities Revealed by Next Generation Sequencing-based Analysis of 298 Split Inteins

서한나,방두희 한국생물공학회 2020 Biotechnology and Bioprocess Engineering Vol.25 No.2

Protein trans-splicing is a naturally occurring process in which two protein fragments are ligated by a reaction between two intein domains, called split inteins. Despite their usefulness in research, the reactivity and structure of only a few split inteins have been studied. We used cell-based kanamycin selection and next-generation sequencing (NGS) to simultaneously measure the splicing reactivity of 298 N-intein–C-intein combinations derived from the DnaE gene of cyanobacteria. Additionally, we confirmed the splicing activities by measuring the growth of cells individually harboring each split intein under kanamycin selection. Overall, the N-intein–C-intein combinations were promiscuous in their trans-splicing activities, although certain combinations did not splice actively. These results and the NGS-based analysis in this research would be helpful for the development of novel split inteins and further understanding of the trans-splicing mechanism.

호랑버들과 갯버들, 종간 교잡종 식별을 위한 DNA 마커 개발

서한나,임효인,이제완 한국육종학회 2023 한국육종학회 공동학술발표집 Vol.2023 No.-

미생물 담체를 이용한 중금속 오염 지하수 정화를 위한 수학적 모형 개발석

서한나,왕수균,이민희,고민정,이지영 대한지질학회 2010 대한지질학회 학술대회 Vol.2010 No.

언니

서한나 부산여성가족과 평생교육진흥원 2021 여성우리 Vol.- No.66