• Journal of the Korean Wood Science and Technology
• /
• v.40 no.6
• /
• pp.418-423
• /
• 2012

In order to develop the end use of cylindrical laminated veneer lumber (LVL) such as wooden crafts, the water proof-bonding strength, the resistance to abrasion and the surface hardness by painting the surface of LVL were investigated. The study results were as follows; The water proof-bonding strength through 5 cyclic test by boiling in water immersion and drying were favorable without delamination of glue line. Then the formulation of glue was resorcinol resin (100) to hardener of paraformaldehyde (5) by mixed weight percentage. The resistance to abrasion was relatively higher at cross section than tangential section. When tangential section of LVL was painted by UV protection oil, the resistance to abrasion was improved. In case of an cross section of LVL, the higher surface hardness appeared at larch core than radiata pine LVL. Also, in case of an tangential section of LVL, the higher surface hardness appeared at glue line than veneer side.

• Korean Journal of Social Welfare
• /
• v.65 no.3
• /
• pp.53-78
• /
• 2013

This study applied hermeneutic grounded theory suggested by Rennie to understand general meaning of adoption decision process of 7 non-married mothers. At the end of the analysis, 191 meaning units, 46 subcategories, and 11 hermeneutic categories were constructed. The core category that threads throughout the adoption decision process was represented as "living with a scar left by the duality of motherhood; repudiating and embracing." The adoption decision process emerged as recognition of pregnancy, avoidance of reality, searching for adoption, escalation of confusion, determination and rationalization or forfeiture. Based upon our research, we suggested that the adoption decision process of non-married mother was another way of practicing motherhood, and we proposed that we need to develop a psycho-social support program to improve the lives of non-married mothers.

• Journal of the Korean Wood Science and Technology
• /
• v.27 no.3
• /
• pp.31-38
• /
• 1999

This paper deals with a coating technique of hardening surface layer of softwood{Larix leptolepis) flooring board to improve its surface properties such as hardness and abrasion resisitance without spoiling its exellent qualities such as beautiful color tones and great strength. For surface hardening of the wood, polyurethane wood sealer was used as under coat, polyurethane sanding sealer as intermediate coat, and UV-curing epoxy acrylate and urethane acrylate varnishes as top coat. The hardness of the wood was improved by the coating treatment and it was similar to that of high density hardwood such as oak, keruing. The abrasion resistance of the coated wood was greatly improved by UV curing epoxy acrylate or urethane acrylate varnishes. Adhesion properties and impact resisitance of the coated wood surface were also good. It was suggested that the well-coated larch wood could be used as interior flooring board as substitute for hardwood such as keruing.

• Elastomers and Composites
• /
• v.41 no.2
• /
• pp.79-87
• /
• 2006

This study are conducted for the purpose of developing rubber material with noise and crack resistance. Cure characteristics, physical properties, thermal resistance, fuel resistance, abrasion resistance, crack resistance and noise resistance of NBR compounds with the various amounts of oleamide and aramid chip were investigated. From the measurements of cure characteristics and Mooney viscosities, cure characteristics of uncured rubber showed that a torque was decreased as the amount of oleamide increased. Hardness, modulus and elongation of rubber specimens tended to be reduced gradually, however, tensile strength remained unchanged as the amount of the oleamide increased. As a testing results of heat resistance for 70 hours at $120^{\circ}C$ and oil resistance far 70 hours at $40^{\circ}C$, tensile strength and elongation were all reduced. From the TGA/DSC analysis, there was no such a change observed in thermal characteristics of rubber materials. As a result of testing basic physical properties, abrasion resistance, noise resistance and crack resistance, the optimum ratio of oleamide to NBR was found to be 3 phr, while that of aramid to NBR 227001 was 1 phr.

• Korean Journal of Social Welfare Studies
• /
• v.41 no.4
• /
• pp.45-79
• /
• 2010

The purpose of this study is to understand surrogate mother aged 20-30s by knowing meaning and structure of empirical phenomena. Methods is to applied to Phenomenological and heuristic Human Becoming Methodology, and the subjects of this study are four surrogate and host mothers who were on the air of SBS program, 'surrogate mother: having a baby for infertile couples(March 8, 2005)', and phenomenological and heuristic Human Becoming Methodology of Parse is applied in this study. Results is the structure that they chose surrogate mother as best option under the economic suffering, and pregnancy and bearing separated motherhood while facing unfair negotiating relationship and accepting reality of forgettable motherhood. The conceptual integration of relationship issues were: valuing, powering and transforming with the process of revealing-concealing and enabling-limiting. Finally, discussion and practical meaning was reviewed.

• Women's Health Nursing
• /
• v.23 no.2
• /
• pp.99-108
• /
• 2017

Purpose: The purpose of this study was to examine the relationship among emotional clarity in emotional intelligence, maternal identity, and fetal attachment to measure how emotional clarity and maternal identity impact on fetal attachment and to determine mediating effects of maternal identity in pregnant women at the time of diagnosis with gestational diabetes mellitus (GDM). Methods: This study used a correlational survey design. 88 pregnant women with GDM completed a study questionnaire of emotional clarity, maternal identity, and fetal attachment immediately after the diagnosis of GDM. Data were analyzed Mann-Whitney U test, and ANOVA with Duncan test, Pearson correlation, three-step regressions to test mediating effect, and Sobel test. Results: The emotional clarity was positively related with maternal identity and fetal attachment. It affected maternal identity with 21.9% of explained variance. The emotional clarity and the maternal identity were significant predictors of fetal attachment by 57.7% of explained variance. The maternal identity mediated the relationship between emotional clarity and fetal attachment. Conclusion: The results suggest that a nursing program to enhance the emotional clarity and the maternal identity needs to be developed as an effective strategy to improve fetal attachment.

• Journal of Families and Better Life
• /
• v.18 no.3 s.47
• /
• pp.71-84
• /
• 2000

The purpose of this study is to analyze the structure of maternal experiences. This study applies ethnographic case study, interview data were collected through in-depth interviews of 10 key interviewees. Findings were as follows: (1) Experiences of the body were about creating a new being through the pain of giving a birth and differed according to woman's self-evaluation of identity. (2) Child-rearing experiences marked a shift of position from a child to a parent. Interviewees experienced the hardhsip of life as a mother, its meanings differed according to the social context of interviewees. Child-rearing experiences meant a process of personal maturity. (3) Mother-child relationship shaped by child-rearing experiences, is a process of building meanings. It led to empathy and reinterpretation of her mother's life.

• Korean Journal of Materials Research
• /
• v.5 no.4
• /
• pp.490-500
• /
• 1995

다이아몬드와는 달리 CBN은 철족 재료 연삭시 화학적 마모가 거의 없다. 이러한 장점으로 인해 CBN휠이 철강 재료 연삭에 널리 사용되고 잇는 것이다. 그러나 CBN 휠의 성능은 CBN을 붙잡고 있는 결합제에 크게 의존한다. 오늘날 널리 사용되는 결합제인 주석 청동 합금은 내마모성에 한계가 있다. 주석 청동 합금의 내마모성을 증대시키기 위해 Co를 첨가하였다. 이러한 기지합금에 젖음성을 향사시키기위해 Co코팅 CBN을 사용하였다. 기지합금에 20%co를 첨가한 것이 입계에서 연속적인 $\delta$상생성, 취성 증가에 따라 자생작용이 활발하였다. 가장 높은 연삭비를 나타낸 것은 Cu-15wt%Sn, cu-33wt%Sn, co를 40:40:20으로 제작한 휠이었다.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2018.06a
• /
• pp.134-134
• /
• 2018

반데그라프 발전기는 큰 전위차를 생성하고 입자를 가속시키기 위해 발명된 정전기 발생기이다. 현재 반데그라프 발전기는 사이클로톤의 개발 이후 입자 가속 목적으로 주로 사용되고 있지는 않지만 접촉 전하 생성, 전달, 및 축적을 가능하게 하는 전하 운반 시스템에 기반하여 간단한 구조로 직류를 발생시킬 수 있는 점은 주목할만하다. 특히, 최근 경량성, 고효율 발전 등의 장점으로 에너지 하베스팅 분야에서 많은 관심을 받고 있는 마찰전기 에너지 하베스팅 기술 분야에서는 최근, 높은 에너지 저장 효율을 위해 직류 발생이 가능한 마찰전기 에너지 발전 소자에 대한 연구들이 진행되고 있다. 그러나 전하 운반 시스템을 기반으로 한 마찰 전기 직류 발전기에 대한 연구는 거의 이루어 지지 않았으며, 보고된 몇 연구에서는 저 전류, 고 임피던스 및 저효율과 같은 반데그라프 발전기의 구조적 및 물질적 한계를 극복하지 못했다. 또한 마찰에 의해 발생하는 마모에 의한 출력 감소 또한 해결되지 못한 문제이다. 따라서 뛰어난 마찰전기 특성과 함께 우수한 내마모성을 가지는 폴리머에 기반하여 기존의 한계를 극복 한 전하 운반 시스템 기반 마찰 전기 직류 발전기를 제안한다.

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2018.06a
• /
• pp.66.2-66.2
• /
• 2018

금속의 양극산화 공정(anodizing)은 전해질 내 금속에 인위적으로 전위를 가해 금속 표면에 얇은 산화막(oxide layer)을 형성하여 금속의 내식성, 내마모성을 증가시키는 공정이다. 타이타늄은 가볍고 단단하여 산업분야에 유용하게 사용되며 이와 같은 양극산화 공정을 통해 내식성, 내마모성을 크게 높일 수 있다. 본 연구에서는 항공기 부품용 타이타늄의 최적 양극산화 조건을 찾기 위해 전압의 파형, 전해액의 조성에 따라 양극산화 실험을 진행하였다. SEM, AFM, EDS, 분광측색계, 색채색차계 등을 이용하여 각 조건에 해당하는 타이타늄의 산화막($Tio_2$)의 두께, crack 형태, pore 형태, 균일도, 표면 조도, 내전압, 색 수치를 분석하였다. 그 결과 전압 DC 140 V, 주성분이 KOH $Na_3PO_4{\cdot}12H_2O$인 전해액으로 이루어진 양극산화 조건에서 가장 균일하고 색 재현성이 우수한 타이타늄의 산화막($Tio_2$)을 형성하였다.