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백연우,유지영,전화연 한국청소년학회 2022 청소년학연구 Vol.29 No.12
This study aims to explore the Non-Suicide Self-Injury(NSSI) Youth whose experiences and meanings in their NSSI process. It provides a fundamental resource to utilize for the effective NSSI counseling process. The research question is what kind of experiences NSSI Youth had in the process of NSSI. To this end, 15 qualitative studies related to NSSI were selected, and a qualitative meta-analysis was analyzed. The findings are as follows: First, the NSSI process was analyzed as the beginning, process, and cessation phases. For Youths who experienced NSSI, the NSSI process continued or stopped, but it could be found to be a cyclical process that continued and stopped. Second, the onset of NSSI was the stage of trauma and existential pain, and the meaning that appeared in the NSSI process was derived. In addition, the NSSI process of the Youth was analyzed by phases and factors that there are triple stages influenced by two factors such as continued and discontinued factors of NSSI. Last, individual and environmental factors affecting the continued and discontinued factors were derived, and a model of existential growth was presented from the meaning of the process. Based on the findings, the characteristics and meanings of the stages of the NSSI process were discussed, and comprehensive results were drawn to suggest the significance and limitations of the study and future research.
집단예술심리치료가 소방공무원의 직무스트레스와 스트레스 대처방식에 미치는 효과
백연우,최명선 한국예술치료학회 2017 한국예술치료학회지 Vol.17 No.1
본 연구는 집단예술심리치료가 소방공무원의 직무스트레스와 스트레스 대처방식에 미치는 효과를 알아보고자 하였다. 연 구대상은 S시에 소재한 119안전센터 소방공무원에게 사전 직무스트레스검사 실시 후 스트레스가 높은 2팀을 대상으로 10명씩 실험집단과 통제집단을 선정하였다. 실험집단은 2016년 1월부터 2016년 3월까지 주 2회 90분씩 13회기의 집단예술 심리치료 프로그램을 시행하였으며, 통제집단은 무처지하였다. 프로그램 효과검증을 위하여 한국형 직무스트레스(KOSS), 스트레스 대처방식 척도와 빗속의 사람그림검사(PITR)를 실시하였다. 회기별 분석을 위하여 모든 회기를 녹음하고 분석하 여 집단예술심리치료과정에서 드러난 변화를 확인하였다. 연구결과, 첫째, 직무스트레스 영역에서 직무요구, 직무자율, 관계갈등 영역에서 유의미한 변화가 나타났다. 둘째, 스트레스 대처방식 영역에서 문제해결력, 정서대처 영역에서 유의미한 변화가 나타났다. 셋째, 빗속의 사람그림(RITR)검사 결과 직무스트레스와 스트레스 대처방식에 있어 통계적으로 유의미한 변화가 나타났다. The purpose of this study was to determine how group arts psychotherapy affected job stress and stress coping style for fire-fighting officers. For this purpose, 20 fire-fighting officers in 119 safety centers in S City were given explanation about the goal of this study and a group arts psychotherapy program was run by reflecting the results of the preliminary research in the experimental group in a total of 13 sessions― 90 minutes per session―twice a week from January to March 2016. While the experimental group was given group arts psychotherapy, no treatment was given to the control group. The Korean Occupational Stress Scale(KOSS) and the stress coping style scale were used; non-parametric Mann-Whitney U test was performed as pretest for homogeneity between the experimental and control groups and non-parametric Wilcoxon signed-rank test was used to determine significant differences between pretest and posttest in each group. The changes found during the course of group arts psychotherapy and the results from Person-In-The-Rain (PITR) drawing test were analyzed. This study is significant in that it has presented therapeutic indexes helpful to improve mental health for fire-fighting officers, who can experience diverse casualties and accidents during the process of suppression, rescue, and emergency as well as at accident sites and, consequently, suffer from stress.
ZnO-Zn<sub>2</sub>BiVO<sub>6</sub>-Co<sub>3</sub>O<sub>4</sub> 세라믹스의 액상소결과 전기적 특성
홍연우,김유비,백종후,조정호,정영훈,윤지선,박운익,Hong, Youn-Woo,Kim, You-Bi,Paik, Jong-Hoo,Cho, Jeong-Ho,Jeong, Young-Hun,Yun, Ji-Sun,Park, Woon-Ik 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.2
This study focuses on the effects of doping $Zn_2BiVO_6$ and $Co_3O_4$ on the sintering and electrical properties of ZnO; where, ZZ consists of 0.5 mol% $Zn_2BiVO_6$ in ZnO, and ZZCo consists of 1/3 mol% $Co_3O_4$ in ZZ. As ZnO was sintered at about $800^{\circ}C$, the liquid phases, which are composed of $Zn_2BiVO_6$ and $Zn_2BiVO_6$-rich phases, were found to be segregated at the grain boundaries of sintered ZZ and ZZCo, respectively, which demonstrates that $V_o^{\cdot}$(0.33~0.36 eV) are formed as dominant defects according to the analysis of admittance spectroscopy. As $Co_3O_4$ is doped to ZZ, the resistivity of ZnO decreases to ~38%, while donor density ($N_d$), interface state density ($N_t$), and barrier height (${\Phi}_b$) increase twice higher than those of ZZ, according to C-V characteristics. This result harbingers that ZZCo and its derivative compositions will open the gate for ZnO to be applied as more progressive varistors in the future, as well as the advantageous opportunity of manufacturing ZnO chip varistors at lower sintering temperatures below $900^{\circ}C$.
Admittance Spectroscopy and Electrical Properties of Co3O4-Doped ZnO
홍연우,이영진,김세기,백종후,김진호 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.5
The varistor characteristics of 0.1 - 3.0 at. % Co-doped ZnO have been investigated. Three kinds of deep bulk trap levels of 0.16, 0.25, and ~0.31 eV were identified as donor levels by admittance spectroscopy. Oxygen vacancy (VO •) appeared preferentially in 0.5 - 3.0 at. % Co-doped ZnO. From J-E characteristics nonohmic behavior was seen in this binary system while the nonlinear coefficient α changed between 3 and 35 depending on the composition. For 1.0 at. % Co-doped ZnO, two distinguishable activation energies of 0.65 eV and 1.04 eV related with grain boundary phenomena were confirmed above and below ~520 K by impedance and modulus spectroscopy. It is believed that the varistor behavior of Co-doped ZnO stems from the formation of double Schottky barrier by the valence change of Co ions in ZnO grains as well as oxygen chemisorption at the grain boundaries on heating and subsequent cooling.
백한솔(Hansol Baek),정연우(Yeonwoo Chung),주미소(Miso Ju),정용화(Yongwha Chung),박대희(Daihee Park),김학재(Hakjae Kim) 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.8
To reduce huge losses in pig farms, weaning pigs with weak immune systems are required to be carefully supervised. Even if various researches have been performed for pig monitoring environment, segmenting each pig from touching-pigs is still entrenched as a difficult problem. In this paper, we propose a segmentation method for touching-pigs by using concave-points and edge information in a video surveillance system. Especially, we interpret the segmentation problem as a time-series analysis problem in order to identify the concave-points generated by touching-pigs. Based on the experimental results with the videos obtained from a domestic pig farm, we believe that the proposed method can accurately segment the touching-pigs.
ZnO-Zn<sub>2</sub>BiVO<sub>6</sub>-Mn<sub>3</sub>O<sub>4</sub> 바리스터의 미세구조와 전기적 특성
홍연우,하만진,백종후,조정호,정영훈,윤지선,Hong, Youn-Woo,Ha, Man-Jin,Paik, Jong-Hoo,Cho, Jeong-Ho,Jeong, Young-Hun,Yun, Ji-Sun 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.5
This study introduces a new investigation report on the microstructural and electrical property changes of $ZnO-Zn_2BiVO_6-Mn_3O_4$ (ZZMn), where 0.33 mol% of $Mn_3O_4$ and 0.5 mol% of $Zn_2BiVO_6$ were added to ZnO (99.17 mol%) as liquid phase sintering aids. $Zn_2BiVO_6$ contributes to the decrease of sintering temperatures by up to $800^{\circ}C$, and segregates its particles at the grain boundary, while $Mn_3O_4$ enhances ${\alpha}$, the nonlinear coefficient, of varistor properties up to ${\alpha}=62$. In comparison, when the sintering temperature is increased from $800^{\circ}C$ to $1,000^{\circ}C$, the resistivity of ZnO grains decreases from $0.34{\Omega}cm$ to $0.16{\Omega}cm$, and the varistor property degrades. Oxygen vacancy ($V_o^{\bullet}$) (P1, 0.33~0.36 eV) is formed as a dominant defect. Two different kinds of grain boundary activation energies of P2 (0.51~0.70 eV) and P3 (0.70~0.93 eV) are formed according to different sintering temperatures, which are tentatively attributed to be $ZnO/Zn_2BiVO_6$-rich interface and ZnO/ZnO interface, respectively. Accordingly, this study introduces a progressive method of manufacturing ZnO chip varistors by way of sintering ZZMn-based varistor under $900^{\circ}C$. However, to procure a higher reliability, an in-depth study on the multi-component varistors with double-layer grain boundaries should be executed.
ZnO-Zn<sub>2</sub>BiVO<sub>6</sub>-Co<sub>3</sub>O<sub>4</sub> 바리스터의 전류-전압 및 임피던스의 온도 특성
홍연우 ( Youn Woo Hong ),김유비 ( You Bi Kim ),백종후 ( Jong Hoo Paik ),조정호 ( Jeong Ho Cho ),정영훈 ( Young Hun Jeong ),윤지선 ( Ji Sun Yun ),박운익 ( Woon Ik Park ) 한국센서학회 2016 센서학회지 Vol.25 No.6
This study introduces the characteristics of current-voltage (I-V) and impedance variance for ZnO-Zn<sub>2</sub>BiVO<sub>6</sub>-Co<sub>3</sub>O<sub>4</sub> (ZZCo), which is sintered at 900℃, according to temperature changes. ZZCo varistor demonstrates dramatic improvement of non-linear coefficient, α = 66, with lower leakage current and higher insulating resistivity than those of ZZ (ZnO-Zn<sub>2</sub>BiVO<sub>6</sub>) from the aspect of I-V curves. While both systems are thermally stable up to 125℃, ZZCo represents a higher grain boundary activation energy with 1.05 eV and 0.94 eV of J-E-T and from IS & MS, respectively, than that of ZZ with 0.73 eV and 0.82 eV of J-E-T and from IS & MS, respectively, in the region above 180℃. It could be attributed to the formation of V<sub>O</sub> (0.41~0.47 eV) as dominant defect in two systems, as well as the defect-induced capacitance increase from 781 pF to 1 nF in accordance with increasing temperature. On the other hand, both the grain boundary capacitances of ZZ and ZZCo are shown to decrease to 357 pF and 349 pF, respectively, while the resistances systems decreased exponentially, in accordance with increasing temperature. So, this paper suggests that the application of newly formed liquid phases as sintering additives in both Zn<sub>2</sub>BiVO<sub>6</sub> and the ZZCo-based varistors would be helpful in developing commercialized devices such as chips, disk-type ZnO varistors in the future.