Subway trains with air cleaners have been newly deployed in the Seoul Metro system. The purpose of this study was to determine differences regarding in-cabin particulate matter with respect to concentrations less than 10 um (PM10) and 2.5 um (PM2.5) through the operation of air cleaners in subway trains. One subway train newly installed with in-cabin air cleaners on Seoul Metro Line number 2 was chosen monitoring in 2020. In-cabin air cleaners were turned-on at both front and back areas while those in the middle area were turned-off while the train was running. In-cabin PM10 and PM2.5 concentrations were measured in each area using a real-time aerosol monitor. Average in-cabin PM10 concentrations were statistically significantly lower (by 15%) in areas with air cleaners turned-on (43.8±12.1 μg/m3) compared to those areas where the air cleaners were turned-off (51.4±15.0 μg/m3). Average incabin PM2.5 concentrations were significantly lower (by 14%) in areas with air cleaners turned on (33.7±12.2 μg/m3) compared to those areas where air cleaners were turned-off (39.2± 14.4 μg/m3). In-cabin PM10 and PM2.5 concentrations ratios were similar regardless of area with air cleaners turned-on or turned-off. The in-cabin PM10 and PM2.5 concentrations were not associated with commute time. Use of air cleaners in subway trains effected reductions in in-cabin PM10 and PM2.5 concentrations.

최근 코로나-19(COVID-19)로 인해 원격근무의 중요성이 강조되고 있는 상황에서 본 연구는 원격근무 상황에서 자기효능감의 역할에 대해 살펴보았다. Bandura(1986)의 자기효능감에 영향을 주는 4대 요인과 Staples et al.(1999)의 가상조직 기반에서의 자기효능감의 선행요인에 관한 연구를 활용하여 연구모형을 설정하였으며, 자기효능감의 선행 변수로는 원격근무에 대한 직접경험, 상사의 원격근무 관찰 경험, IT 변화 두려움, 상사의 코칭을 설정하였다. 또한, 상사의 코칭을 통한 언어적 설득이 자기효능감에 영향을 주는 과정에서 상사 신뢰의 조절효과에 대하여 검증을 하고자 하였다. 본 연구의 목적을 달성하기 위하여 원격근무 경험이 있는 근로자 463명의 설문응답 결과를 분석 자료로 활용하였다. 연구 결과는 원격근무에 대한 직접경험과 상사의 코칭을 통한 언어적 설득은 자기효능감을 높이는 정(+)의 영향을, IT 변화 두려움은 자기효능감을 낮추는 부(-)의 영향을 미치는 것을 확인하였다. 그리고 상사 신뢰가 높은 집단은 상사 신뢰가 낮은 집단에 비하여 상사의 코칭이 자기효능감에 미치는 효과가 더 강한 것으로 확인되었다. 본 연구는 4차 산업 환경과 코로나-19의 시대적 상황을 반영한 원격근무와 자기효능감에 대한 연구를 통하여 원격근무에 대한 직접 경험이 자기효능감에 영향을 주는 주요한 변수임을 확인하였다.

Chinese Idioms are important as a Part of Chinese Vocabulary, Korean learners who use Chinese as a second language understand and grasp the usage of the Chinese-Korean idiom，It will also play a significant role in learning Chinese for Korean learners. A Comparative Study on Chinese and Korean idiom of same patterns of synonyms provides many conveniences and references for Korean Chinese learners, Nevertheless, there are differences in Chinese and Korean of syntactic, semantic and pragmatic functions of idiom of same patterns of synonyms. Therefore, Korean Chinese learners may have some troubles learning and using Chinese idioms. Dissertation takes between Chinese and Korean idiom of same patterns of synonyms from the new HSK level six Vocabulary Outline and two sets of the new HSK level six official test paper as the research subject, make Research and Analysis on Chinese and Korean synonym idioms differences between using frequency and usage of idioms in Chinese and Korean databases, in addition, make a comparative study between Chinese and Korean of syntactic and pragmatic functions of idiom of same patterns of synonyms, both Chinese and Korean idiom of same patterns of synonyms of the meanings are similar, however there are still many differences.

화석 연료를 사용할 때, 불완전 연소는 필연적으로 발생하는 문제이다. 이러한 관점에서 연소 후 기체 분리는 불완전 연소 기체의 재활용 가능성을 시사한다. 이와 관련하여 본 연구에서는 일산화탄소 기체 분리용 촉진수송 고분자 분리막을 제조하였다. 이를 위해 poly(vinyl alcohol) (PVA) 주사슬 기반으로 acrylic acid (AA) 단량체를 자유 라디칼 중합법으로 PVA-g-PAA 공중합체를 제조하였다. 본 공중합체를 일산화탄소 활용에 적용하는 사례는 처음이며, 제조한 공중합체는 AgBF4 염과 HBF4를 혼합하여 기체 분리막에 적용하였다. 공중합체 합성 결과는 FT-IR을 통해 분석하였으며, 공중합체와 AgBF4, HBF4의 상호작용은 TEM를 통해 분석하였다. 염의 첨가를 통해 일산화탄소 기체의 촉진수송 채널을 형성하였으며 이를 통해 일산화탄소 분리막 분야에 촉진수송 및 그래프팅 방법이라는 새로운 접근법을 제시하였다.

Based on corpus linguistics, synchronic and diachronic linguistics, lexicology, pragmatics, sociolinguistics and other theoretical knowledge, this paper makes a dynamic and in-depth study of the “Gou” popular neologisms. Under the guidance of corpus linguistics, this paper makes a statistical analysis of the word family of “Gou”, summarizes the growth of the number of members of the word group, the high frequency use of the word family, the syllable structure of the members of the word family, etc., and shows the changing characteristics of the word group in various aspects. Using the methods of etymology investigation and dynamic tracking, this paper analyzes that the word family of “dog” is a process in which many new words of “xxgou” type are derived from the original use of “single dog”, and gradually expand to 128 members. Under the guidance of lexicology theory, by means of semantic analysis, this paper sums up four referential meanings of "Gou" from the referential meaning of [+ animal] to [+ human], and then, through generalization, it derives four referential meanings of [+ identity], [+ profession / profession / field], [+ state], [+ stress / tension], [+ preference], [+ behavior / thing], [+ aversion], [+ behavior / thing]. Under the guidance of pragmatics theory, this paper explores the word family of “Gou” and summarizes the characteristics of the morpheme “Gou” of the family of words with the characteristics of quasi affixation, trisyllabic structure of words and single part of speech of members of the word group.

In this study, actual odor conditions were investigated in restaurants, livestock facilities, and major odor discharge facilities around daily life, and an odor modeling program was performed to find ways to improve odors in odor discharge facilities. The odor modeling results of restaurants around daily life showed that the complex odor concentration of large restaurants, which are close to residential areas, is higher than the acceptable complex odor standard at the receiving point. It was judged that a plan to increase the height of the restaurant odor outlets and a plan to reduce the amount of odor discharge was necessary. As a result of modeling the life odor of livestock housing facilities, when the distance from the housing facility is far away, the actual emission concentration is much lower than the acceptable emission concentration at the receiving point. It was judged that such facilities need to be reviewed for ways to reduce the emission of odorous substances, such as sealing the livestock housing facilities or improving the livestock environment. The main odor emission business sites that show complex odor concentration as 1,000 times or greater than the outlet odor emission standard were businesses associated with surfactant preparation, compounded feed manufacturing, textile dyeing processing, and waste disposal. Due to the separation distance and high exhaust gas flow rate, it was found that odor reduction measures are necessary. In this study, it was possible to present the allowable odor emission concentration at the discharge facilities such as restaurants, livestock houses, and industrial emission facilities by performing the process of verifying the discharge concentration of the actual discharge facility and the result of living odor modeling. It is believed that suitable odor management and prevention facilities can be operated.

과수농가에서 수행되는 수확작업은 노동부하가 큰 주요작업으로 수확된 과실의 적재 및 운반작업에 소모되는 노동력이 크다. 본 연구에서는 과수농가를 대상으로 수확된 열매의 적재 및 운반작업에 사용 가능한 간이형 보행 동력운반차를 개발하였다. 과수 농민들의 요구조건을 고려하여 동력운반차의 이동속도 및 적재 용량을 선정하였다. 이에 따라, 동력운반차의 주요 구성요소를 선정하고 동력전달경로를 분석하였다. 또한, 개발된 동력운반차의 성능시험을 수행하였으며 상용 소프트웨어를 활용하여 구조해석을 수행하였다. 설계된 간이형 보행 동력운반차는 전·후진이 가능하고 이동속도는 최대 1 m/s이며, 최대적재용량은 500 kg이다. 본 연구에서 개발된 간이형 보행 동력운반차를 활용하면 농민들의 작업효율을 높이고 신체적인 부담을 경감시킬 수 있을 것으로 판단된다.

MDPS control has been a difficult problem for the past two decades. Though there are many ways to control steering feeling, the MDPS control logic is still being upgraded or developed for steering feel improvement. A new point of view in MDPS is proposed by evolution logic, which is a new driver friendly improvement based on the analysis of driver’s driving pattern. As a result of the application of evolution logic, this paper shows that drivers behaviour effecting factors among MDPS parameters will efficiently lead to customers’ satisfaction.