• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.200.2-200.2
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• 2010

This study was carried out in order to reduce the amount of underground water which is used in the water curtain system for retaining heat. To proceed to the research, two plastic green houses of water curtain system were installed. One was equipped of internal small tunnel for keeping warm air in the interior of the house. Then the internal small tunnel for keeping warm air was fitted with PVC duct of 50cm in diameter filled with subsurface water. Storing surplus solar energy in the water filled in PVC duct was the method used to this house. Another was installed with FCU in the middle of the house, and was fitted a circulation motor in water tank for heat storage which was operated from 10 a.m. to 4 p.m. in order to interchange heat with FCU. The latter was installed with four FCUs which has a capacity of 8000kcal per hour. Consequently about 5 degrees celsius could be maintained in the interior of the internal small tunnel for keeping warm air with the external temperature of more than minus 5 degrees celsius. It appeared that the alteration of an internal temperature of the house was flexible depending on the sunlight during daytime. It happened that to prevent the water from freezing, mixing antifreezing liquid in the flowing water of FCU or changing the operating method of FCU was a suitable measure. Also, in order to use the surplus solar thermal energy on plastic green house of water curtain system efficiently, storing the surplus heat during daytime simultaneously finding a method of using water curtain systematic underground water happened to be important. As a result of this research, when the house's interior temperature is below zero the operation of FCU appeared to be impossible. Therefore when supposed that the amount of water used in the house is 150~200ton for stable operation of FCU, using the system mentioned in the above research happened to be appropriate of reducing the amount of subsurface water from 80% to 100% when maintaining the interior of internal small tunnel's temperature for keeping warm air of 5 degrees celsius at the extreme temperature of minus 5 degrees celsius.

• 대한한방내과학회지
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• 제35권3호
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• pp.288-297
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• 2014

Objectives: The goal of this project was to measure the antibacterial effectiveness of Hwangryunhaedok-tang (barberry root decoction for detoxification) and its constituents. All of the active ingredients including the final product were prepared using high-pressure sterilization for use as medicinal eye drops. The varying forms of Hwangryunhaedok-tang (barberry root decoction for detoxification) were used to treat Staphylococcus epidermidis and Enterococcus faecalis which are found in keratitis. Methods: The antibacterial effect was measured by observing the presence or absence of antimicrobial activity when treated with varying concentrations of Hwangryunhaedok-tang extract. The tests were performed using a dosage of $70{\mu}l$ dosages of 100%, 50%, 10% and 1% the extracted solution by the minimum growth inhibitory concentration measurement. Antimicrobial activity was measured by examining the correlation between dosage strength and bacterial activity from $70{\mu}l$ to $10{\mu}l$ at the same concentration. Results: 1. Hwangryunhaedok-tang (barberry root decoction for detoxification), Phellodendri Cortex, and gardenia didn't show any antimicrobial effects against S. aureus, S. epidermidis, or E. faecalis. 2. Barberry root showed antimicrobial effects against S. aureus and S. epidermidis depending on the levels of concentration but didn't show any antimicrobial effects against E. faecalis. 3. Skullcap showed antimicrobial effects against S. aureus and S. epidermidis when a dosage of 100% extract $70{\mu}l$ was used. However, did not show any antimicrobial effects at all against E. faecalis. Conclusions: Hwangryunhaedok-tang (barberry root decoction for detoxification) and its constituents such as barberry root, phellodendri cortex, skullcap, and gardenia, can be used as an alternative to antibiotic medicinal eye drops to treat keratitis. However, further research on effective uses of and efficient extraction methods are needed.

• 한국식품위생안전성학회지
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• 제16권3호
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• pp.194-199
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• 2001

국내에서 시판중인 230점(돈육샘플80점, 계육샘플 80점, 우육샘플 70점)의 식육 샘플에 대하여 미생물 오염수준 측정시 표준방법으로 통용되는 AOAC (the Association of Official Analytical Chemists)의 standard total aerobic count method 및 coliform count method와 국내에서 개발된 HApS$^{TM}$ (Hazard Analysis process System) method를 비교하였다. 돈육, 계육, 우육을 샘플군으로 하여 총세균수 및 대장균수를 표준방법과 HApS$^{TM}$방법으로 각각 측정하여 그 두 방법간의 상관관계를 조사하였다. 선형회귀분석 및 t-검정법의 통계적 방법을 사용하여 각 샘플군에서의 두 방법간의 상관계수(r) 및 회귀직선식을 얻었고, 각 샘플군에서 두 방법에 의한 각각의 표본평균이 주어진 유의수준($\alpha$=0.05)에서 유의한 차이를 보이지 않았다. 즉, 본 실험에 사용된 샘플에 대하여 표준방법과 HApS$^{TM}$ 방법간의 유의한 차이를 발견하지 못하였다. 그러므로 표준방법에 비하여 실험시간 및 실험방법에서 신속성 및 간편성을 지니는 HApS$^{TM}$방법은 축산식품의 총세균 및 대장균군 오염도 측정시에 표준방법을 대신할 수 있는 유용한 방법이라고 할 수 있다.

• Imaging Science in Dentistry
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• 제49권4호
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• pp.295-299
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• 2019

Purpose: This clinical pilot study was performed to determine the effectiveness of dual-energy cone-beam computed tomography (DE-CBCT) in measuring bone mineral density (BMD). Materials and Methods: The BMD values obtained using DE-CBCT were compared to those obtained using calibrated multislice computed tomography (MSCT). After BMD calibration with specially designed phantoms, both DE-CBCT and MSCT scanning were performed in 15 adult dental patients. Three-dimensional (3D) Digital Imaging and Communications in Medicine data were imported into a dental software program, and the defined regions of interest (ROIs) on the 3-dimensional surface-rendered images were identified. The automatically-measured BMD values of the ROIs (g/㎤), the differences in the measured BMD values of the matched ROIs obtained by DE-CBCT and MSCT 3D images, and the correlation between the BMD values obtained by the 2 devices were statistically analyzed. Results: The mean BMD values of the ROIs for the 15 patients as assessed using DE-CBCT and MSCT were 1.09±0.07 g/㎤ and 1.13±0.08 g/㎤, respectively. The mean of the differences between the BMD values of the matched ROIs as assessed using DE-CBCT and calibrated MSCT images was 0.04±0.02 g/㎤. The Pearson correlation coefficient between the BMD values of DE-CBCT and MSCT images was 0.982 (r=0.982, P<0.001). Conclusion: The newly developed DE-CBCT technique could be used to measure jaw BMD in dentistry and may soon replace MSCT, which is expensive and requires special facilities.

• Journal of Periodontal and Implant Science
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• 제38권1호
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• pp.97-102
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• 2008

Purpose: Periodontal intrabony defects have great deal of importance since they contribute to the development of periodontal disease. Current treatment regimens for intrabony defects involve grafting of numerous bony materials, GTR using biocompatible barriers, and biomodification of root surface that will encourage the attachment of connective tissue. Xenograft using deproteinized bovine bone particles seems to be very convenient to adjust because it doesn't require any donor sites or imply the danger of cross infections. These particles are similar to human cancellous bone in structure and turned out to be effective in bone regeneration in vivo. We here represent the effectiveness of grafting deproteinized bovine bone particles in intrabony defect and furcation involvements that have various numbers of bony walls. Materials and methods: Open flap debridement was done to remove all root accretions and granulation tissue from the defects within persisting intrabony lesions demonstrating attachment loss of over 6mm even 3 months after nonsurgical periodontal therapy have been completed. Deproteinized bovine bone particles($BBP^{(R)}$, Oscotec, Seoul) was grafted in intrabony defects to encourage bone regeneration. Patients were instructed of mouthrinses with chlorohexidine-digluconate twice a day and to take antibiotics 2-3 times a day for 2 weeks. They were check-up regularly for oral hygiene performance and further development of disease. Probing depth, level of attachment and mobility were measured at baseline and 6 months after the surgery. The radiographic evidence of bone regenerations were also monitored at least for 6 months. Conclusion: In most cases, radio-opacities increased after 6 months. 2- and 3-wall defects showed greater improvements in pocket depth reduction when compared to 1-wall defects. Class I & II furcation involvements in mandibular molars demonstrated the similar results with acceptable pocket depth both horizontally and vertically comparable to other intrabony defects. Exact amount of bone gain could not be measured as the re-entry procedure has not been available. With in the limited data based on our clinical parameter to measure pocket depth reduction following $BBP^{(R)}$ grafts, it was comparable to the results observed following other regeneration techniques such as GTR.

• 대한한방부인과학회지
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• 제30권3호
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• pp.146-157
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• 2017

Objectives: This study was performed to assess the effectiveness of Korean medicinal treatments including Antaeeum-gamibang on posterior neck pain and lower back pain caused by traffic accidents during pregnancy. Methods: Patients were treated by Antaeeum-gamibang, acupuncture and Chuna manual therapy. To measure treatment outcomes, Numerical rating scale (NRS), Oswestry disability index (ODI), Neck disability index (NDI), European Quality of Life-5 Dimensions (EQ-5d), and range of motion (ROM) were used. Results: After treatment, the average NRS of posterior neck pain significantly decreased from $4.20{\pm}1.30$ to $1.80{\pm}0.45$ and the average NRS of lower back pain significantly decreased from $6.40{\pm}1.14$ to $2.20{\pm}0.84$. ODI significantly decreased from $41.42{\pm}17.79$ to $28.29{\pm}14.69$, NDI significantly decreased from $34.93{\pm}9.85$ to $20.27{\pm}8.96$. EQ-5d and ROM improved at all cases. Conclusions: Korean Medicinal treatments including Antaeeum-gamibang may be effective in the treatment of posterior neck pain and lower back pain caused by traffic accidents during pregnancy. However, more case reports and studies are required to identify exactly what treatment is more efficient.

• Journal of Korea Trade
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• 제25권3호
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• pp.21-47
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• 2021

Purpose - Offshoring has emerged as one of the major trends in international trade and has become one of the strategies for achieving competitiveness in the global market. In spite of this, the expected gains of offshoring can be offset by hidden costs and risks, such as those associated with the COVID-19 pandemic, the trade war between the USA and China, and the ongoing trade dispute between Korea and Japan. To obviate such business failure and prevent critical business blunders, offshoring strategies that efficiently consider both risk elements and potential wealth creation are urgently need. The first purpose of this study is to contribute to the development of more advanced offshoring strategies to help host countries select the best locations to manage supply chain risks and create unique value. The second purpose is to specifically analyze the current status of Korea and provide Korean companies with implications to be considered when deciding whether to offshore or re-shore. Design/methodology - A Network DEA model was applied to measure the comparative location efficiency of national competencies for offshoring strategy from perspectives of wealth creation opportunities (profitability and marketability) and supply chain risk management. The location efficiencies are compared among a total 70 countries selected from the Global Competitiveness Index (GCI) and globally attractive locations outlined by Kearney (2017). For the secondary analysis of efficiency, a t-test examining the nature of competitive advantage and the level of sophistication in production processes was implemented in three divisions. We then analyzed differences in offshoring performance in terms of the identified national traits. Moreover, Tobit regression analysis is conducted to investigate the correlation between value-added business activities and each divisional efficiency, seeking to determine how each degree of value-added business activity influences the increase in offshoring productivity. Findings - Regarding overall location efficiency for offshoring performance, only the USA and Italy were identified as being efficient as host countries for offshoring, under circumstances of advanced development, such as productivity and risk management. Korea ranks 13th among 70 countries. The determinants of national competitiveness depend on national traits (the nature of competitive advantage and business sophistication). Countries with labor/resource advantages and labor-intensive industries are more competitive in terms of marketability than others. In contrast, countries with strong technology-intensive industries benefit offshoring companies, particularly in the technology sector, with the added advantage of supply chain risk management. As the perception of a value chain is broader in a country, it can achieve both production sophistication and competitive advantages such as marketability and SCRM. Originality/value - Existing studies focus on offshoring effectiveness from a company perspective. This paper contributes to comparing country efficiency in producing core competencies related to an offshoring strategy and also segments countries into three performance-based considerations associated with the global offshoring market. It also details Korea's position as an offshoring location according to national efficiency and competency.

• 한국컴퓨터그래픽스학회논문지
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• 제29권3호
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• pp.137-147
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• 2023

본 연구는 모션캡처 기반의 투영형 VR 시스템을 이용하여 환경 인식도를 개선하는 게임화의 유효성을 탐색하였다. 그 과정에서 긍정적 및 부정적인 VR 게임 콘텐츠의 주요 요소와 개인 플레이와 협동 플레이 방식이 지속 가능한 행동 촉진에 어떠한 영향을 미치는지 분석하였다. 연구 결과는 다음과 같다. 첫째로, 분리수거의 중요성에 대한 인식 개선에서는 개인 플레이 방식에서 긍정적 콘텐츠의 사용이 효과적임을 발견하였다. 둘째로, 환경오염의 심각성에 대한 인식 증진에서는 협동 플레이 방식에서 긍정적 콘텐츠의 사용, 개인 플레이 방식에서는 부정적인 콘텐츠의 사용이 각각 효과적임을 확인하였다. 셋째로, 개인 플레이에서 긍정적인 콘텐츠를 먼저 경험한 후, 부정적인 콘텐츠를 경험하는 것이 환경에 대한 관심 증가에 효과적임을 확인하였다. 이 연구 결과를 바탕으로, 환경 인식 개선을 위해 단순히 긍정적이거나 부정적인 콘텐츠만을 사용하는 것보다, 개선 대상에 따라 긍정적인 콘텐츠와 부정적인 콘텐츠의 사용 순서를 조절하는 것이 더 효과적임을 확인하였다. 또한, 분리수거의 중요성, 환경오염의 심각성, 그리고 환경에 대한 관심도를 모두 고려할 때, 개인 플레이 방식이 효과적이며, 각 척도에 따라 협동 플레이 방식이 더 효과적일 수도 있음을 확인하였다.

• 한국기후변화학회지
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• 제7권2호
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• pp.169-176
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• 2016

This study was to conduct a literature review and a theoretical study on 95 environmental education programs currently being run in the metropolitan area and obtained Environmental Education Program Certification of Ministry of Environment. First, the suitability of the environmental education programs was analyzed in terms of the following criteria which the Second National Environmental Education Master Plan propose: strengthening environmental education within the curriculum, strengthening preschooler environmental education, diversification of environmental education among targeted groups, and invigoration of community-based environmental education, and evaluated the contents and the proportion relevant to climate change. Based on the result, the measure for the improvement of the environmental education programs was proposed. As a result of the analysis, there were only 15 programs for children, and 20 programs for adults. Also, only 9% of the children and adult education programs were addressing climate change respectively, which was indicating low percentage. 75 programs were directly related to the school curriculum, and 8 programs were not related to subjects in regular curriculum. Also, considering addressing climate change, 7 out of 11 programs were related to the school curriculum. 71 out of 95 programs were located in the facilities of local governments. Programs that were including the contents relate to climate change were only 11 out of 95 programs. It is necessary to operate programs by expanding environmental education programs targeting children and adults, so all people are took into account, and consider the connectivity between curriculum and environmental education program in South Korea to increase the effectiveness of education. Also, it is necessary to educate people sustainably by relating the programs with various resources which can be utilized in the local community, to include climate change related contents with more proportion, and to address various subjects rather than focusing on one part of the subjects.

• 한국운동역학회지
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• 제32권1호
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• pp.17-23
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• 2022

Objective: The aim of this study was to investigate the effect Tiger-step walking on the movement of the lower extremities during walking. Method: Twenty healthy male adults who had no experience of musculoskeletal injuries on lower extremities in the last six months (age: 26.85 ± 3.28 yrs, height: 174.6 ± 3.72 cm, weight: 73.65 ± 7.48 kg) participated in this study. In this study, 7-segments whole-body model (pelvis, both side of thigh, shank and foot) was used and 29 reflective markers and cluster were attached to the body to identify the segments during the gait. A 3-dimensional motion analysis with 8 infrared cameras and 7 channeled EMG was performed to find the effect of tigerstep on uphill walking. To verify the tigerstep effect, a one-way ANOVA with a repeated measure was used and the statistical significance level was set at α=.05. Results: Firstly, Both Tiger-steps showed a significant increase in stance time and stride length compared with normal walking (p<.05), while both Tiger-steps shown significantly reduced cadence compared to normal walking (p<.05). Secondly, both Tiger-steps revealed significantly increased in hip and ankle joint range of motion compared with normal walking at all planes (p<.05). On the other hand, both Tiger-steps showed significantly increased knee joint range of motion compared with normal walking at the frontal and transverse planes (p<.05). Lastly, Gluteus maximus, biceps femoris, medial gastrocnemius, tibialis anterior of both tiger-step revealed significantly increased muscle activation compared with normal walking in gait cycle and stance phase (p<.05). On the other hand, in swing phase, the muscle activity of the vastus medialis, biceps femoris, tibialis anterior of both tiger-step significantly increased compared with those of normal walking (p <.05). Conclusion: As a result of this study, Tiger step revealed increased in 3d range of motion of lower extremity joints as well as the muscle activities associated with range of motion. These findings were evaluated as an increase in stride length, which is essential for efficient walking. Therefore, the finding of this study prove the effectiveness of the tiger step when walking uphill, and it is thought that it will help develop a more efficient tiger step in the future, which has not been scientifically proven.