The purpose of this study is to provision the standard method for ensuring the reliability of measuring indoor air quality in public transportation. The objective is to determine the difference in the measured concentration values according to various conditions. These variables include measurement conditions, measurement equipment, measurement points, and measurement time. The value differences are determined by measuring the PM10 and CO2 concentration of subways, and express buses and trains, which are targets of indoor air quality management. The concentration of CO2 was measured by the NDIR method and that of PM10 was measured by the gravimetric method and light-scattering method. Statistically, the results of the concentration comparison according to the measurement points of the public transportation modes were not significantly different (p > 0.05), and it is deemed that the concentration is not affected by the measurement points. In terms of the concentration analysis results according to the measurement method, there was a difference of the concentration between the gravimetric and light scattering method. In the case of the light scattering method, the concentration differed depending on whether it was corrected with standard particles in the laboratory environment.

This research has been conducted to develop a prevention module of collision and balance lost in electric wheelchairs. Ultrasonic sensors were used for detecting obstacles. Giro and acceleration sensors were used for measuring the tilt angle of wheel chair frame. Kalman filters were employed for filtering high-frequency noise of acceleration sensor and removing zero drift of the Giro sensor. The presence and location of obstacles were detected, and their information was sent to the user smartphone. When the tilt angle of the wheelchair frame exceeded a certain value, a warning signal was set to operate. Raspberry Pi camera module was used to transfer rear view image data to the smartphone to help the driver acknowledge obstacles in the rear side. A DSP processor with high computing performance was necessary to realize a real-time processing of the sensor and image data. Our research showed that a prevention module of collision and balance lost connected to a smartphone can be realized at a considerable low price.

This research proposes an optimal flushing operation technique in an effort to prevent secondary water pollutions and accidents in aged pipes, and to improve the cleaning effect of unidirectional flushing. Water flow directions were analyzed using EPANET 2.0, while flushing and air scouring experiments in forward and reverse directions were performed in the field. In 42 experiments, average residual chlorine concentration and turbidity were improved after cleaning compared to before cleaning. It was found that even when the same cleaning method was used, further improvement of cleaning effect was possible by applying air injection and reverse direction cleaning techniques. By means of one-way ANOVA(Analysis of variance), it was also possible to statistically verify the need of actively utilizing air injection and reverse direction cleaning. Based on correlation between turbidity and TSS, the total amount of suspended solids removal was estimated for 874 flushing operations and 194 air scouring operations. The result showed that air scouring used more discharge water than flushing by an average of 4.9 m3 yet with larger amounts of suspended solids removal by an average of 145.9 g. The result of analysis on turbidity values from 887 flushing operations showed low cleaning effect of unidirectional flushing for the pipes with diameters over 300 mm. In addition, the turbidity values measured during cleaning showed an increasing tendency as pipe age increased. The methodology and results of this research are expected to contribute to the efficient maintenance and improvement of water quality in water distribution networks. Follow-up research involving the measurement of water quality at regular time intervals during cleaning would allow a more accurate comparison of discharge water quality characteristics and cleaning effects between different cleaning methods. To this end, it is considered necessary to develop a standardized manual that can be used in the field and to provide relevant trainings.

화석연료 사용이 증가하면서 온실가스 및 대기오염가스 등의 환경오염 문제가 심각해졌다. 이를 해결하기 위한 신재생에너지, 친환경적인 대체에너지원을 찾기 위한 많은 연구가 이뤄지고 있다. 연료전지는 전기에너지를 발생하며 부산물로 물만이 생성되는 친환경 에너지 발생장치다. 특히, 전해질로 음이온 교환막을 사용하는 음이온 교환막 연료전지(Anion Exchange Membrane Fuel Cell)는 높은 촉매의 활성으로 양이온 교환막 연료전지(Proton Exchange Membrane Fuel cell)와 다르게 저가의 금속 촉매를 사용할 수 있는 장점 때문에 관심이 높아지고 있다. 음이온 교환막으로써 요구되는 주요 특성은 높은 이온(OH-) 전도도 및 높은 pH의 구동조건에서의 안정성이다. 본 연구에서는 PPO계 고분자의 화학적 가교 반응을 이용해 얻어진 가교형 고분자 막의 낮은 기계적인 특성과 치수 안정성을 높이기 위해 보다 높은 분자량을 갖는 고분자 사용과 함께 가교율 증대를 통해 보다 높은 이온 전도도와 기계적인 성질, 높은 화학적인 안정성뿐만 아니라 실제 연료전지 구동조건에서 높은 셀 성능을 갖는 AEMFC용 고분자 전해질 막을 개발했다.

목적 : 본 연구의 목적은 장애인운전지원센터 현황과 이용자 대상 설문조사 결과를 분석하여 이를 바탕으로 장애인운전지원센터 발전방안을 제시하는데 있다. 연구방법 : 장애인운전지원센터 서비스 인력 및 이용자 현황을 조사하고, 장애인운전지원센터 이용자 76명을 대상으로 설문조사를 실시하였다. 설문결과는 SPSS 18.0 version을 사용하여 빈도분석 및 기술통계, 일원배치 분산분석(one way ANOVA)을 통해 분석하였다. 결과 : 첫째, 대상자는 대부분 2종 보통 운전면허를 취득하고자 하였으나 운전면허 취득 후 바로 운전할 계획이 없다는 응답도 많았는데, 그 이유는 직접 운전할 차량이 없거나 운전 실력이 부족해서인 것으로 나타났다. 둘째, 장애인운전지원센터에 대한 정보는 주로 인터넷, 주변사람의 안내, 복지관, 홍보물을 통해 얻는 경우가 많았고, 의료기관, 보건소, 관공서, TV 등 대중매체를 통한 경우는 매우 적었다. 셋째, 운전교육 중 가장 어렵다고 느끼는 부분은 주차와 사이드/룸미러로 주변 확인으로 나타났으며, 이어서 핸들 조작 및 기어변속, 차로유지 순으로 나타났다. 넷째, 장애인운전지원센터의 전반적인 만족도는 매우 높은 것으로 나타났다. 센터의 환경 및 서비스 항목 중에서는 지리적 접근성이 가장 만족도가 낮았고, 운전교육은 가장 높았다. 다섯째, 장애인운전지원센터 개선사항으로는 모든 시험장에 장애인운전지원센터 추가 설립, 장애인운전지원센터에 대한 홍보 강화, 장애인 운전자에 대한 혜택 안내, 운전면허 취득 후 교통안전교육 등 사후 지원 강화에 대한 요구가 있는 것으로 나타났다. 결론 : 본 연구는 장애인운전지원센터 현황조사 및 이용자 설문조사를 통해 장애인운전지원센터의 발전방안을 제시하고자 하였다. 본 연구를 기초로 향후 장애인운전지원센터 이용자의 만족도를 높이고, 장애인 운전면허 취득 및 자가운전을 지원하는 다양한 방안이 마련되길 기대해본다.

We develop a purification process of Hg2Br2 raw powders using a physical vapor transport(PVT) process, which is essential for the fabrication of a high performance acousto-optic tunable filter(AOTF) module. Specifically, we characterize and compare three Hg2Br2 powders: Hg2Br2 raw powder, Hg2Br2 powder purified under pumping conditions, and Hg2Br2 powder purified under vacuum sealing. Before and after purification, we characterize the powder samples through X-ray diffraction and X-ray photoelectron spectroscopy. The corresponding results indicate that physical properties of the Hg2Br2 compound are not damaged even after the purification process. The impurities and concentration in the purified Hg2Br2 powder are evaluated by inductively coupled plasma-mass spectroscopy. Notably, compared to the sample purified under pumping conditions, the purification process under vacuum sealing results in a higher purity Hg2Br2 (99.999 %). In addition, when the second vacuum sealing purification process is performed, the remaining impurities are almost removed, giving rise to Hg2Br2 with ultra-high purity. This high purification process might be possible due to independent control of impurities and Hg2Br2 materials under the optimized vacuum sealing. Preparation of such a highly purified Hg2Br2 materials will pave a promising way toward a high-quality Hg2Br2 single crystal and then high performance AOTF modules.

목적 : 본 연구는 도로교통공단 장애인운전지원센터에서 2017년까지 운전면허를 취득한 장애인의면허취득 현황을 비교 및 분석하고, 이를 바탕으로 향후 국내 장애인 운전과 관련된 제반사항에 대한 개선방안을 도출하는데 그 목적이 있다. 연구방법 : 전국 7개 장애인운전지원센터 중 2개 장애인운전지원센터에서 운전조력을 통해 운전면허를 취득한 장애인 488명에 대한 현황 및 항목별 빈도분석을 실시하였다. 결과 : 분석 결과, 개소 이후 2017년까지 2개 장애인운전지원센터에서 운전조력을 받고 운전면허를 취득한 장애인은 총 488명 이었으며, 장애유형별로는 지체장애 234명, 뇌병변장애 45명, 청각장애 151명, 발달장애 33명, 정신장애 3명, 기타장애 22명인 것으로 나타났다. 장애등급별로 확인해본 결과, 1급 60명, 2급 221명, 3급 207명인 것으로 나타났으며, 운전면허 취득 종별은 1종대형 19명, 1종보통 114명, 2종보통 353명, 1종특수 2명으로 확인되 었다. 결론 : 본 연구는 장애인운전지원센터 개소 이후, 운전면허를 취득한 장애인의현황 및 관련정보 제시하고, 이를 바탕으로 국내에 거주하는 장애인이 운전면허를 취득하는데 있어 개선사항을 도출하고자 하였다. 본 연구를 토대로 장애인이 운전면허를 취득하는데 있어 국가차원의제도적 개선 및 지원과 장애인 운전에 대한 인식변화가 이뤄지길 기대한다.

In recent years, interest in halal authentication from the domestic food and cosmetics field has been growing for advances into the overseas halal market. For halal authentication, the product must not contain haram ingredients derived from pig, dog, human, GMO, etc. In this study, the presence of haram ingredients in plant extracts (carrot, oyster mushroom, and pine needle) treated with papain and bromelain and cosmetics (mask pack and cream) containing these extracts were analyzed by PCR to confirm whether these cosmetics were suitable for halal authentication. Detection limits of the PCR method that specifically detected template DNA of human, pig, dog, and GMO were 1.29×103, 1.14×103, 1.24×102 and 2.02×103 copies/tube, respectively. PCR was not inhibited by the plant extracts or cosmetic ingredients. Results of PCR for the plant extracts or cosmetics containing these extracts were all negative. This PCR method could be used to rapidly identify the presence of haram ingredients in raw materials or final products during the manufacturing process of food and cosmetics.

Water supply/intake pumps operation use 70~80% of power costs in water treatment plants. In the water treatment plant, seasonal and hourly differential electricity rates are applied, so proper pump scheduling can yield power cost savings. Accordingly, the purpose of this study was to develop an optimal water supply pump scheduling scheme. An optimal operation method of water supply pumps by using genetic algorithm was developed. Also, a method to minimize power cost for water supply pump operation based on pump performance derived from the thermodynamic pump efficiency measurement method was proposed. Water level constraints to provide sufficient disinfection performance in a clearwell and reservoirs were calibrated. In addition, continuous operation time constraints were calibrated to prevent frequent pump switching. As a result of optimization, savings ratios during 7 days in winter and summer were 4.5% and 5.1%, respectively. In this study, the method for optimal water pump operation was developed to secure disinfection performance in the clearwell and to save power cost. It is expected that it will be used as a more advanced optimal water pump operation method through further studies such as water demand forecasting and efficiency according to pump combination.

There is a great importance in the development of anion exchange membrane fuel cells (AEMFCs) for renewable energy research. The high conductivity and alkaline stability under high pH conditions at elevated temperatures are required for AEMs. We report herein SEBS-based AEMS with different hydrophobic side chain lengths, and investigated the properties of the corresponding AEMs, including conductivity, morphology and chemophysical stabilities.