• 대한화학회지
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• 제48권2호
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• pp.151-155
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• 2004

금 전극 표면을 시스테인으로 수식한 자기조립 단층막(self-assembled monolayers; SAMs)을 만들고 이를 퀴논 작용기를 갖고 있는 도파민과 반응시킨 수식전극을 제작하였다. 이 전극을 에탄올 내에서 6시간 정도 정치하면 SAMs가 잘 정돈 되어서 보다 개선된 형태의 순환전압전류법(cyclic voltammetry; CV)의 결과를 얻게 되었다. 그 결과 SAMs 말단에 o-퀴논의 산화-환원특성은 0.1 M 인산염 완충용액(pH=7.10)에서 형식전위 값이 0.28 V이고 피크 전위차이가 없는 가역성이 뛰어난 전극이 제작되었다. 이 전극으로 NADH의 정량을 위한 검정선을 제작하였으며, 5.0 ${\times}\;10^{-4}$ M농도까지 정량이 가능한 0.993의 뛰어난 상관관계를 보였다.

• 동력기계공학회지
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• 제18권2호
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• pp.37-42
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• 2014

The purpose of this paper is to investigate polarization characteristics of heat-treated Ni-based self-flux alloy coating in alkaline solution. Ni-based self-flux alloy powder was sprayed to a steel substrate using flame spray process, and heat treatments were performed in a vacuum furnace at $800^{\circ}C$, $900^{\circ}C$, $1000^{\circ}C$ and $1100^{\circ}C$. After heat treatments, corrosion tests were carried out using potentiostat/galvanostat at solution with pH 8 and pH 13. Corrosion potential(Ecorr) and corrosion current density(Icorr) could be analyzed from polarization curve. Anticorrosive effect of heat-treated coating at solution with pH 8 was relatively greater than at solution with pH 13. Heat-treated coating at $1100^{\circ}C$ showed the greatest anti-corrosion characteristics in alkaline solution.

• International Journal of Contents
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• 제14권1호
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• pp.12-17
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• 2018

This study explored potential therapeutic mechanisms of playing preferred online games as predictors of therapeutic interventions for players' psychosocial factors (i.e., aggression, depression, and loneliness). Based on theories of catharsis, the generic model of psychotherapy, we took a therapeutic approach to integrate these perspectives. We created a path model describing how therapeutic catharsis-seeking, online game self-efficacy, and life self-efficacy were associated with psychosocial factors of aggression, depression, and loneliness, including generalized sub-constructs of each factor as multi-dimensional sources. We analyzed the path model using data of 1,227 online game players in Korea. Our results indicated that therapeutic catharsis-seeking could alleviate aggression via favorite game playing. Life self-efficacy was a primary predictor for alleviating depression and loneliness. However, online game self-efficacy was positively associated with depression and loneliness. Implications of these findings are discussed.

• Advances in Traditional Medicine
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• 제4권3호
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• pp.137-156
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• 2004

Altruistic virtuous caring, possibly originated from religion and/or spirituality, is indispensable for holistic health through channeling vital energy with diet, exercise and meditation. This is a participant-observed medical anthropological research of a first generation Korean elderly immigrant health professional woman living in a four generational family. She had hypertension and was concerned about possible attack of stroke. Multi-religious, spiritual, and cosmological vital energy based on holistic Nature-oriented health beliefs and practices influenced by psychosocial, cultural and economic background, education, self- discipline and self-cultivation of individual, and group or family may create health. Self-care beliefs based on confidence in self-control of one's life style for oneself and others influence individual and group health practice. The holistic alternative health beliefs and practices were proved to be efficacious and beneficial by her self-evaluation, evaluation of significant others, biomedical professionals, and laboratory tests. That may have potential application for global health.

• 보건교육건강증진학회지
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• 제23권2호
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• pp.1-10
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• 2006

Purpose: This study was aimed to evaluate the effects of substance abuse prevention education for middle school students in Busan. Method: The data were collected by a self-administered questionnaire before education and one month later. The whole subjects were 458 students in first grade of middle school. The data were analyzed using frequencies and difference t-test after classifying the whole into potential drug abuse group and not potential group. Results: The substance abuse prevention education was ineffective in the whole group and the potential group. However, in the not potential group, the increasing rate of SPDA(Screening scale for Potential Drug-use Adolescents) score in experimental group was less than in control group. Conclusion: The substance abuse prevention education was effective for the not potential drug abuse group. On the other hand, intensive long-term drug abuse treatment program was needed for the potential group.

• 수산해양교육연구
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• 제24권2호
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• pp.146-165
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• 2012

The purpose of this study is development of learning coaching program that is grafted onto advantage of Self-directed learning and coaching intended for Youth-After-School-Academy children and analysis the effect on self-efficacy and Self-directed learning ability from this program. The program of this study is developed on the base of Seels & Richey's 'ADDIE Model'. In order to verify the effect of this study, two times tests were carried out on 14 persons of the experimental group and the control group respectively, before and after the program was performed. The MANCOVA & ANCOVA was done on the difference between the post-test results of the experimental group and the control group. Findings of this study might be summarized as follows: First, the post-test result in the experimental group on self-efficacy was meaningfully higher than in the control group. Second, on Self-directed learning ability the result in the experimental group was also higher than in the control group. Therefore, learning coaching program impacted on self-efficacy and Self-directed learning ability of Youth-After-School-Academy children. This program that aim to discover the potential on learning, expect to be effective for children education of today when pursue Self-directed learning ability and creativity.

• 전기학회논문지
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• 제62권7호
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• pp.994-1002
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• 2013

This study suggests a generalized availability and safety evaluation model to evaluate the influences to the system's fault tolerant capabilities depending on automatic fault detection function such as the automatic periodic testings. The conventional evaluation model of automatic fault detection function deals only with the self diagnostics, and supposes that the fault detection coverage of self diagnostics is always constant. But all of the fault detection methods could be degraded. For example, the periodic surveillance test has the potential human errors or test equipment errors, the self diagnostics has the potential degradation of built-in logics, and the automatic periodic testing has the potential degradation of automatic test facilities. The suggested evaluation models have incorporated the loss or erroneous behaviors of the automatic fault detection methods. The availability and the safety of each module of the safety grade platform have been evaluated as they were applied the automatic periodic test methodology and the fault tolerant evaluation models. The availability and safety of the safety grade platform were improved when applied the automatic periodic testing. Especially the fault tolerant capability of the processor module with a weak self-diagnostics and the process parameter input modules were dramatically improved compared to the conventional cases. In addition, as a result of the safety evaluation of the digital reactor protection system, the system safety of the digital parts was improved about 4 times compared to the conventional cases.

• 패션비즈니스
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• 제21권5호
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• pp.43-60
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• 2017

The purpose of this study is to conduct an in-depth examination into the cause of stress as well as reasons for turnover relative to fashion industry workers in their 20s-30s, thereby seeking effective improvement methods to reduce turnover. The study method consisted of one-on-one in-depth interviews to collect data on 15 fashion industry workers. Results were as follow. First, causes of stress for fashion industry workers in their 20s-30s include work related factors, interpersonal relations, and organizational culture, while the most frequently mentioned reasons for turnover were concerns about career track and aptitude as well as annual salary, revealing that self-improvement related growth potential is the most significant factor for turnover. Second, it was not one stress factor that influenced turnover but a composite of several stress factors that motivated individuals to change jobs. Last, time flexibility, self-esteem, and development potential were critical factors for turnover. Self-esteem and development potential that provide a sense of acknowledgment were especially emphasized as the most significant, revealing that the younger generation considers personal happiness to be critical and the more this aspect is not treated adequately the more the odds of choosing turnover. To mitigate this issue, an in-house educational system for self-development and an assignment rotation system must be adopted for workers to change to positions that fit their aptitude.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1815-1820
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• 2008

Self-catalytic behavior of combustion-synthesized carbon nanotubes (CNTs) is evaluated using a double-faced wall stagnation flow burner with a CNT-deposited stainless steel plate wall. CNT formation is observed using field-emission scanning and transmission electron microscopies and Raman spectroscopy. A self-catalytic behavior of multi-walled CNTs (MWCNTs) shows the enhanced ratio of channel diameter to tube wall thickness and the enhanced intensity ratio of G-band to D-band in Raman spectroscopy, implying that the quality of metal-catalytic, flame-synthesized MWCNTs can be much improved via a CNT self-catalytic flame-synthesis process. Thus, using a DWSF burner through the self-catalytic process has potential in mass production of CNTs having much improved quality.

• Journal of Ginseng Research
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• 제43권3호
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• pp.421-430
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• 2019

Background: The ginsenoside Rg3, one of active components of red ginseng, has chemopreventive and anticancer potential. Cancer stem cells retain self-renewal properties which account for cancer recurrence and resistance to anticancer therapy. In our present study, we investigated whether the standardized Korean Red Ginseng extract (RGE) and Rg3 could modulate the manifestation of breast cancer stem cell-like features through regulation of self-renewal activity. Methods: The effects of RGE and Rg3 on the proportion of $CD44^{high}/CD24^{low}$ cells, as representative characteristics of stem-like breast cancer cells, were determined by flow cytometry. The mammosphere formation assay was performed to assess self-renewal capacities of breast cancer cells. Aldehyde dehydrogenase activity of MCF-7 mammospheres was measured by the ALDEFLUOR assay. The expression levels of Sox-2, Bmi-1, and P-Akt and the nuclear localization of hypoxia inducible $factor-1{\alpha}$ in MCF-7 mammospheres were verified by immunoblot analysis. Results: Both RGE and Rg3 decreased the viability of breast cancer cells and significantly reduced the populations of $CD44^{high}/CD24^{low}$ in MDA-MB-231 cells. RGE and Rg3 treatment attenuated the expression of Sox-2 and Bmi-1 by inhibiting the nuclear localization of hypoxia inducible $factor-1{\alpha}$ in MCF-7 mammospheres. Suppression of the manifestation of breast cancer stem cell-like properties by Rg3 was mediated through the blockade of Akt-mediated self-renewal signaling. Conclusion: This study suggests that Rg3 has a therapeutic potential targeting breast cancer stem cells.