In order to find out the management and sanitation status of protective gear provided at the construction site, a case study and survey were conducted by visiting the site. As a result of the case study, inspection and management, disinfection, and storage of protective equipment were insufficient in both workplaces with less than 50 employees and workplaces with more than 100 employees. As a result of the survey, workers(66.2%), said they did not know how to identify hard hats(67.6.%), how to identify bad hard hats(60.8%), and how to identify bad safety belts (73.0%), even though workers(66.2%) were educated on protective gear, and those in charge of protective gear Non-specified(56.8%), regular inspection of the provided protective equipment was not performed(82.4%), and disinfection was not performed(90.5%). Therefore, as a management plan to maintain the performance of personal protective equipment, educational aspects, regular training on protective equipment, training on how to identify defective protective equipment, management of recording papers, technical aspects, strengthening of standards for placement of dedicated safety managers in small workplaces, participation of workers’ representatives when selecting protective equipment, and selection of protective equipment for workers Providing opportunities, administrative aspects of protective equipment regulation and management, introduction of sanitary and cleanliness system, and selection of personnel in charge of protective equipment management were suggested.

This study examined the effect of ultraviolet (UV) application on bacterial disinfection in a commercialized humidifier using ultrasonic wave (UW). To accurately examine disinfection kinetics in tap-water condition, tap-water was sterilized using a filter, and then inoculated with pure cultures of E. coli and P. putida with known viable counts. The disinfection kinetic characteristics were experimentally compared when UV alone, UW alone, and UW+UV together were applied in disinfecting the added bacteria in the commercialized humidifier. When UV alone was applied, bacterial disinfection kinetics followed a first-order decay reaction, and showed an approximately 10-time weaker disinfection compared to the typical UV disinfection in water treatment or wastewater treatment. When UW alone was applied, bacterial disinfection kinetics followed a second-order decay reaction with a low disinfection rate constant of 0.0002 min-1(CFU/mL)-1. When UV and UW were applied together, however and interestingly, the disinfection rate constant (0.0211 min-1(CFU/mL)-1) was approximately 100 times increased than that for the UW alone case. These results revealed that the co-use of UV and UW can provide synergistic effect on bacterial disinfection in a tap-water condition in household humidifiers.

This study investigated the effects of silage additives on rumen fermentation characteristics of rye silage. Rye was harvested at ripening stage and treated with different additives in quadruplicate following: without additive (control), with either lactic acid bacteria inoculant (LAB), formic acid (FA), or Ca-formate (Ca-FA). Overall, ensiling characteristics of FA and Ca-FA silages contained 4-fold more (P<0.05) butyrate and 2-fold more (P<0.05) NH3-N concentration (% total nitrogen) than those of control and LAB silages. Cows fed LAB silage showed a diurnal trend with the highest values of propionate concentration compared to the control at 1, 2 and 3 hr after feeding. In contrast, FA and Ca-FA silages increased the proportion of butyrate significantly (P<0.05) at all sampling times compared to control and LAB silage. In conclusion, Forage rye treated with FA or Ca-FA showed different fermentation characteristics during ensilage and in the rumen compared to LAB silage. Further studies are needed to evaluate whether different fermentation characteristics in the rumen between LAB and FA silages had effect on partitioning of nutrients between milk production and body tissue.

This study examines the factors configuration management quality of the construction company, and to analyze the impact of these factors on Project Performance and Company Performance. That quality construction management configuration factors, chief executives, corporate strategy, organizational management, information technology, and partners five variables, Project Performance variables, process management, quality management, cost management, safety management, environmental management five variables, and Company Performance parameters of financial competence and organizational satisfaction, quality of work three variables, the overall causal relationship between the presence of specific activities and management quality, classified according to the size of the company were verified by the difference in impact between the two groups.

국제적으로 지구온난화와 화석연류 고갈이라는 두 가지 이슈에 대한 관심이 증대되고 있다. 이에 따라 에너지원 다양화 및 대체 에너지 개발이 부각되면서 신･재생에너지에 관한 연구가 활발히 이루어지고 있다. 우리나라는 2015년까지 총 1차 에너지원의 4.3%, 2020년까지 6.1%, 2030년까지 11.0%를 신･재생에너지 공급을 목표로 하는 국가에너지 기본계획을 수립하고, 이에 따른 기술의 개발 및 산업육성에 주력하고 있다. 기후변화에 관한 국제 연합 기본 협약(UNFCCC; The United Nations Framework Convention Change)의 발표에 의하면 우리나라는 세계 10위의 온실가스 배출국으로서 수년이내에 온실가스 감축의무대상국으로 지정될 것이다. 따라서 친환경 청정에너지 보급을 보다 적극적으로 시행해야 한다. 신･재생에너지로는 태양광, 풍력, 수소연류전지, IGCC(석탄가스화 복합발전), 바이오디젤 등이 있다. 이중 바이오디젤은 동･식물성 유지(대두유, 유채유, 폐식용유, 우지 등)를 이용하여 생산하지만 농지면적과 식량에 대한 윤리적인 문제가 대두되고 있다. 미세조류는 앞에서 언급한 문제가 없으며 신･재생에너지로써의 바이오디젤 뿐만 아니라 산업적으로 건강식품, 화장품, 물고기 먹이 등으로 이용되며 탄소고정이라는 환경적인 면에서도 매력적인 유기자원이다. 조류는 태양에너지를 이용하여 이산화탄소(CO2)와 물(H2O)을 합성하여 다양한 생성물을 형성하는 미생물로써 조류의 자기균체 중 지질은 중량 대비 60% 이상을 생산하며, 이는 바이오디젤을 만드는데 사용되고 있다. 본 연구에서는 담수성 조류인 클로렐라 종(Chlorella vulgaris)을 실험 균주로 선정하였으며, 배양액은 BBM배지에서 working volume 200 ml, 인큐베이터 내부온도 25℃(±1)에서 실험하였다. 미세조류 성장에 가장 큰 영향을 미치는 광원의 종류는 차세대 조명이라고 각광받는 LED를 이용하였다. 실험 제어 인자는 빛의 파장(Rad, Blue, White), 빛의 주기{(24:0), (16:8), (14:10), (12:12)}, CO2 주입량(2%, 5%, 10%)으로 균체성장속도와 최대균체농도를 향상시킬 수 있는 미세조류의 최적배양조건과 최대지질 생산조건을 도출하여 기타 바이오에너지 이용에 대한 기초자료를 제공하고자 한다.