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조윤행,신동호,박현설,허지은,심준목,Joe, Yun-Haeng,Shin, Dongho,Park, Hyun-Seol,Heo, Jieun,Shim, Joonmok 한국입자에어로졸학회 2021 Particle and Aerosol Research Vol.17 No.2
In this study, the clean air delivery rate (CADR) of ceiling air circulator (CAA) was determined under indoor environmental simulation conditions. An air filter was used to provide air cleaning ability to the CAA. The CADR of filter adapted CAA was evaluated and compared with the value of commercial air purifier. The installation of mesh-shaped filter on the CAA showed particle reduction effect on the particles over 0.4 ㎛ in diameter, but the CADR was up to 0.25 m<sup>3</sup>/min. When the filter having 99.9% in collection efficiency was installed on the CAA, its CADR was 1.52 m<sup>3</sup>/min, while the CADR of commercial air purifier was 3.19 m<sup>3</sup>/min.
유럽권 한국어 학습자의 내러티브를 통한 학습 동기 연구 - 국내 체류 학습자를 중심으로 -
조윤행 연세대학교 언어연구교육원 한국어학당 2022 외국어로서의 한국어교육 Vol.66 No.-
Recently, as the number of Korean learners with various backgrounds and purposes has increased, the number of Korean language learners from European countries is also increasing. However, studies on Korean language learners from European countries mainly focus on curriculum, textbook development, and teaching methods, and there are not many studies that focus on the learner itself to identify the motivation for learning. Therefore, this study attempted to investigate with what motivation European Korean language learners, who wanted to learn Korean in South Korea, had through narrative research. As a result, it was found that learners, who were exposed to several languages due to the regional specificity of Europe, had a strong interest in learning a new language. Also, through various occasions, they became curious about Korean culture, and their interest in the language and their curiosity about culture led them to start learning Korean. In this process, various experiences in life in South Korea were working as another strong motivation for learning Korean. In addition to this, the social context that did not adequately cope with the unstable public security or the pandemic in Europe became one of the factors that encouraged learners to come to South Korea to study Korean. This study is significant in that it studied learners’ learning motives from various linguistic and cultural backgrounds and can be a reference for the composition of educational content for Korean language learners from European countries. 최근 다양한 배경과 목적을 가진 한국어 학습자가 증가하면서 유럽권 한국어 학습자의 수도 크게 증가하고 있다. 그러나 유럽권 한국어 학습자의 연구는 교육과정이나 교재 개발, 교수 방안 등에 치중되어 있으며, 학습 동기와 같이 학습자 자체에 주목하여 진행된 연구가 많지 않다. 교육과정이나 교재 개발, 교수 방안 설계 등을 위해서는 학습자의 학습 동기 파악이 우선해야 그 방향을 설정할 수 있을 것이며, 이러한 관점에서 본 연구는 내러티브 연구를 통해 유럽권 학습자의 학습 동기를 파악하고자 하였다. 연구 참여자들의 내러티브 분석 결과, 유럽의 지역적 특수성으로 인해 다양한 언어에 노출될 수 있는 환경은 유럽권 학습자들을 자연스럽게 언어에 대해 관심을 가지도록 하였다. 이뿐만 아니라 참여자들은 여러 가지 계기로 인해 한국 문화에 대해 호기심을 가지고 있었으며, 언어에 대한 관심과 문화에 대한 호기심이 맞물려 한국에서 한국어를 공부하기로 선택한 것으로 보인다. 이러한 과정에서 한국 생활에서의 다양한 '경험'은 그들에게 한국에서 한국어를 학습하게 하는 강한 동기로 작용하였다. 또한 불안정한 치안이나 팬데믹에 적절하게 대처하지 못한, 유럽이 처한 사회적 맥락이 이들이 한국어와 한국을 선택한 하나의 요인이 되었다. 본 연구는 다양한 언어적, 문화적 배경을 가진 한국어 학습자들의 학습 동기를 살펴보았다는 점에서 연구의 의의가 있으며, 앞으로 이들을 위한 교육 내용 구성에 참고가 될 것으로 기대한다.
요근 농양이 동반된 Salmonella typhi 척추골수염 1예
조윤행,홍성수,김은옥,이미숙,김양수,우준희,배직현,류지소 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
저자들은 아직 국내에 보고된 적이 없는 S. typhi에 의한 척추골수염 환자에서 ciprofloxacin을 5주간 투여하여 임상적 호전을 보였던 증례를 경험하였기에 보고하는 바이다. Vertebral osteomyelitis by Salmonella infection is rare. Although it is known to be associated with sickle cell anemia, various hemoglobinopathies and immunosuppressive states, it may also occur in normal host. To date, vertebral osteomyelitis with Salmonella. typhi has not been reported in Korea. We experienced a case of spinal osteomyelitis due to S. typhi in a 48-year old man who was admitted because of low back pain for two months. MRI scan showed vertebral osteomyelitis in L1 & L2. Needle aspiration was performed by CT guidance. S. typhi was identified from aspirated pus. However, any organism was not identified from blood and urine cultures. He was treated with ciprofloxacin for 5 weeks successfully.
Gerdien 이온측정기를 이용한 에어로졸의 하전 특성 분석에 관한 연구
조윤행,심준목,신일경,육세진,박현설,Joe, Yun-Haeng,Shim, Joonmok,Shin, Il-Kyoung,Yook, Se-Jin,Park, Hyun-Seol 한국입자에어로졸학회 2018 Particle and Aerosol Research Vol.14 No.1
Since the motion of the charged particle strongly depends on its charge characteristics, information on charge distributions of target particles is one of the important variables in aerosol research. In this study, charged distribution of atomized NaCl particles were measured using a Gerdien type ion counter. Two kinds of particle charging conditions were used in this study. First, atomized NaCl particles were passed through an aerosol neutralizer to have a Boltzmann charge distribution, and then its charge distribution was measured. In this case, the portion of uncharged particles was compared with the portion obtained from the Boltzmann charge distribution for verifying the suggested experimental method. Second, same experiment was conducted without the aerosol neutralizer to measure the charge distribution of atomized and un-neutralized NaCl particles. In the conclusion, the portion of uncharged, negatively charged and positively charged particles were 19%, 62% and 20%, respectively, for neutralized particles. The atomized particles, which was generated without the aerosol neutralizer, also had almost a zero charge state, but the standard deviation in charge distribution was larger than that of neutralized particles. The test method proposed in this study is expected to be used in various aerosol research fields because it can obtain simple information on the particle charge characteristics more easily and quickly than the existing test methods.
에어로졸 공정을 이용한 전열교환기의 은나노 입자 코팅 및 항균 능력과 열교환 성능 평가
조윤행(Yun-Haeng Joe),박철우(Chul-Woo Park),박재홍(Jae-Hong Park),황정호(Jungho Hwang) 한국실내환경학회 2011 한국실내환경학회지 Vol.8 No.1
In this study, an enthalpy exchanger was coated by silver nano particles via spark discharge method and its antimicrobial and heat exchange efficiencies were evaluated. A method utilizing thermophoretic force was used to improve coating efficiency. Four spark discharge systems were parallel connected and generated silver nano aerosol particles (number concentration of 1.65×108 particles/cc, mode diameter of 31 nm). The coating efficiency was evaluated according to various face velocities (V=0.25~1 m/s) and temperature gradients ((Thot-Tcold)/Thot=0~0.09). The maximum coating efficiency was 90.8 % when the face velocity was 0.25 m/s and the temperature gradient was 0.09 (Thot=30℃, Tcold=2℃). Silver nano particles were coated onto the enthalpy exchange element and two different coating amounts of silver nano particles (0.11㎍/㎠, 0.22㎍/㎠) were tested. For evaluation of antimicrobial efficiency, the suspension test method with E. coli was used. After the suspension test method, CFU(colony forming unit)s of each test sample were counted and colony ratio was calculated. The colony ratio was decreased more quickly when the amount of coated silver particles was increased. When the contact time between each sample and suspension was over 3 hours, antimicrobial efficiencies of coated samples were more over 99.9 % for both amount of silver nano particle(0.11㎍/㎠, 0.22㎍/㎠). The coating of silver nano particles did not affect the heat exchange efficiency.