• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2011년도 춘계학술대회 논문집
• /
• pp.122-127
• /
• 2011

Recently eco friendly energy is the most interested field and has been research actively. MCFC is a representative technology of eco friendly energy. Eco friendly energy shouldn't cause environmental problems like noise and vibration because that is the technology to solve environmental problems. The major noise and vibration source of MCFC is blowers. this project designed sound enclosure and isolator as the best way for blowers.

• 한국경영과학회:학술대회논문집
• /
• 한국경영과학회/대한산업공학회 2003년도 춘계공동학술대회
• /
• pp.821-826
• /
• 2003

The Purpose of this paper is to automate the representation of manufacturing line using Petri net model. In the manufacturing cell, the line can be represented using workflow which is composed of Bill of Material (BOM) and Bill of Processes (BOP). BOP shows the precedence of processes and the relationship between assembly and disassembly. As a modeling scheme, generalized stochastic Petri net is adopted. For a problem domain with flexible manufacturing cell, Petri net model is made and behavioral properties are analyzed.

• 원자력산업
• /
• 제24권8호통권258호
• /
• pp.26-37
• /
• 2004

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
• /
• pp.89.1-89.1
• /
• 2011

According to green growth's policy, green-home dissemination's projects are promoting. Among them, stationary fuel cell systems are receiving attention due to high efficiency and clear energy. But it need absolutely to develop cost down technologies and improve system durability for commercialization of the fuel cell system. To achieve this objectives, in 2009, the Korean Government and "Korea Institute of Energy Technology Evaluation and Planning(KETEP)" launched into the strategic development project of BOP technology for practical applications and commercializations of stationary fuel cell systems, named "Technology Development on Cost Reduction of BOP Components for 1kW Stationary Fuel Cell Systems to Promote Green-Home Dissemination Project". This paper introduces a summary of improved BOP performances that has been achieved through the 2nd year development precesses(2010.06~2011.05) base on 1st year development precesses(2009.06~2010.05). The major elements for fuel cell systems are cathode air blowers, burner air blowers, preferential oxidation air blowers, fuel blowers, cooling water pumps, reformer water pumps, heat recovery pumps, mass flow meters, electrical valves, safety valves and a low-voltage inverter. Key targets of those elements are the reduction of cost, power consumption and noise. Invert's key targets are development the low -voltage technologies in order to reduce the number of unit cell in fuel cell system's stack.

• Nuclear Engineering and Technology
• /
• 제38권2호
• /
• pp.109-118
• /
• 2006

Various indirect power cycle options for a helium cooled gas cooled fast reactor (GFR) with particular focus on a supercritical $CO_2(SCO_2)$ indirect cycle are investigated as an alternative to a helium cooled direct cycle GFR. The balance of plant (BOP) options include helium-nitrogen Brayton cycle, supercritical water Rankine cycle, and $SCO_2$ recompression Brayton power cycle in three versions: (1) basic design with turbine inlet temperature of $550^{\circ}C$, (2) advanced design with turbine inlet temperature of $650^{\circ}C$ and (3) advanced design with the same turbine inlet temperature and reduced compressor inlet temperature. The indirect $SCO_2$ recompression cycle is found attractive since in addition to easier BOP maintenance it allows significant reduction of core outlet temperature, making design of the primary system easier while achieving very attractive efficiencies comparable to or slightly lower than, the efficiency of the reference GFR direct cycle design. In addition, the indirect cycle arrangement allows significant reduction of the GFR &proximate-containment& and the BOP for the $SCO_2$ cycle is very compact. Both these factors will lead to reduced capital cost.

• 무역상무연구
• /
• 제78권
• /
• pp.145-174
• /
• 2018

This study, focused on Official Development Assistance(ODA) as a solution to the global polarization and demonstrated how corporate social responsibility (CSR) plays a role in raising the performance of ODA. First, socio - economic value and profit - created by CSV activities have a significant effect on constructing an economic reciprocal relationship between donor countries and recipient countries. In addition, it has shown that it promotes the simultaneous development of companies and society through the strategic CSR model and consequently contributes to the achievement of ODA. Second, it suggests that the elements of the BOP model have a significant effect on improving the unreasonable wage system and unethical working conditions of developing countries. Furthermore, this suggests that improving the income of the poor can improve the performance of ODA. Third, this study reconstructed 'CSR Pyramid' of Carrol and newly devised CSRD theory. In the case of ODA to developing countries, economic, legal, ethical, and charitable responsibilities are set priorities. In this study, it is suggested that the priority should be flexibly set as economic ${\rightarrow}$ charitable ${\rightarrow}$ ethical ${\rightarrow}$ legal responsibility. This study reexamines the strategic CSR model in the international management field and conducted empirical analysis on CSV, BOP, CSRD model as the constituent elements. In addition, the strategic CSR model that has moved away from the traditional and old-fashioned perspectives still has room for development, and exploratory research to develop the model will continue to contribute to clarifying the concept and scope of CSR.

• 한국치위생학회지
• /
• 제24권1호
• /
• pp.1-7
• /
• 2024

Objectives: We analyzed the relative beneficial impacts of probiotics and coconut oil-based mouth rinses on oral health. Methods : A total of 33 subjects were enrolled and randomly assigned to three groups. Coconut oil and probiotics were given to the experimental group, and distilled water to the control group. We evaluated the possession site of Gingival index, CPITN index, BOP, Pocket depth, and PHP index. Results: In the coconut oil and probiotic groups, Gingival index significantly decreased on both days 15 and 30. CPITN significantly decreased on days 15 and 30 in the coconut oil group (p<0.01), and on day 30 in the probiotic group (p=0.002). There was a significant interaction between group and time for BOP and PHP index (p<0.001), and the coconut oil group was more effective in improving BOP and PHP index. Conclusions: The above results showed that the mediation effect of coconut oil and probiotics was more effective with coconut oil.

• Journal of Periodontal and Implant Science
• /
• 제50권5호
• /
• pp.340-354
• /
• 2020

Purpose: This pilot study was conducted to evaluate the cleaning efficacy of an angled implant brush for home oral hygiene of full-arch fixed-implant prostheses. Methods: Forty-one patients treated with a full-arch implant rehabilitation in the maxilla or mandible (164 implants) for at least 4 months were enrolled. The screw-retained fixed prostheses were removed and baseline (T0) parameters were recorded, including plaque index (PI), probing depth (PD), and bleeding on probing (BOP). All patients completed a 5-item questionnaire on hygiene maintenance and received an implant brush for home hygiene. After 1 month (T1) PI, PD, and BOP were recorded again and patients completed a 7-item questionnaire to evaluate their satisfaction with the implant brush. One-way repeated-measures analysis of variance was conducted to evaluate the significance of changes in PI, PD, and BOP. A P value <0.05 was considered to indicate statistical significance. Results: A statistically significant reduction of BOP (0.62±0.6 at T0 vs. 0.5±0.5 at T1; P=0.032) was found, while no statistically significant changes in PD (1.74±0.5 mm at T0 vs. 1.77±0.5 mm at T1; P=0.050) or PI (1.9±0.7 at T0 vs. 1.7±0.7 at T1; P=0.280) occurred. According to the 7-item questionnaire, patients reported no difficulty in using the angled brush (63.4%) and deemed it highly (46.3%) or very highly (4.8%) effective in improving their home oral hygiene. Conclusions: Within the limits of the present pilot study, the patients experienced a reduction of BOP 1 month after being instructed to use the angled implant brush. The angled implant brush appeared to be a well-accepted device for home-care hygiene of full-arch fixed-implant rehabilitations.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제47권6호
• /
• pp.445-453
• /
• 2021

Objectives: Periodontitis is the most common chronic disease that causes tooth loss and is related to systemic diseases such as cardiovascular disease and diabetes. An objective indicator of the current activity of periodontitis is necessary. Soluble forms of the receptor for advanced glycation end products (sRAGE) are markers that reflect the status of inflammatory diseases. In this study, the relationship between sRAGE and periodontitis was analyzed to determine whether it can be used to diagnose the current state of periodontitis. Patients and Methods: Eighty-four patients without any systemic diseases were diagnosed with periodontitis using three classifications of periodontitis. Demographics and oral examination data such as plaque index (PI), bleeding on probing (BOP) index, and probing pocket depth (PPD) were analyzed according to each classification. In addition, correlation and partial correlation between sRAGE and the values indicating periodontitis were analyzed. Results: In each classification, the level of sRAGE tended to decrease if periodontitis was present or severe, but this change was not statistically significant. sRAGE and periodontitis-related variables exhibited a weak correlation, among which the BOP index showed a relatively strong negative correlation (ρ=-0.20). Based on this, on analyzing the correlation between the BOP index and sRAGE in the group with more severe periodontitis (PPD≥5 mm group, severe group of AAP/CDC [American Academy of Periodontology/Centers for Disease Control and Prevention], periodontitis group of López), the correlation further increased (ρ=-0.23, -0.40, -0.50). Partial correlation analysis of the sRAGE and BOP index showed a stronger negative correlation (ρ=-0.36, -0.55, -0.45). Conclusion: sRAGE demonstrated a tendency to decrease upon increased severity of periodontitis according to the classifications used. Above all, the correlation with the BOP index, which reflects the current state of periodontitis, was higher in the group with severe periodontitis. This indicates that the current status of periodontitis can be diagnosed through sRAGE.

• 플랜트 저널
• /
• 제8권1호
• /
• pp.8-12
• /
• 2012