• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.964-966
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• 2003

The three-phase induction motor is rugged, reliable, long-lived, self-starting, smooth-running. But it is relatively inexpensive and three-phase power in not available everywhere, so if possible we need single-phase motor with the same characteristics. In fact, single-phase induction motors have excellent characteristics and outnumber the three-phase variety. Most of the small electric motors used in home, farm, or office are single-phase induction motors of one type or another. This electric motors application field need most energy saving type drive according to enlargement of electronic goods and to tend high class. The paper is proposed a various phase control methods for energy saving of single- phase induction motor. The controllers that are embodied by each method can use by various usage according to each performance and it is considered that application may help in the electrical energy saving because is possible to other electrical appliances.

• Archives of Pharmacal Research
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• 제25권4호
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• pp.550-555
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• 2002

The discovery and development of the taxane class of antitumor compounds represent significant advances in the treatment of patients with a variety of malignancies. These drugs are effectively used in the treatment of breast cancer. In this study we evaluated the efficacy of fractionated usage of both paclitaxel and docetaxel as a single agent in the breast cancer cell line MCF-7. It has been shown that the cytotoxic effect of paclitaxel was increased when the divided $IC_{50}$ concentrations were used sequentially and in contrast to paclitaxel, cytotoxic effect of docetaxel was decreased with the same schema and the single dose of $IC_{50}$ concentration was optimal. The cause of the difference between the cytotoxic effects of two agents with this schedule is obscure. Demonstrating mechanisms, which are responsible for these differences, will be important for more rational use of taxoids and to provide basis for the following clinical trials.

• 한국어교육
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• 제28권2호
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• pp.155-184
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• 2017

As the media changes, communication patterns in modern society have been changed as well. This change in the media environment has also transformed the required literacy and it is time to accept this new literacy in Korean language education. At this point, this paper inspected the perception of media literacy classes of 73 teachers currently in the field of Korean language education. The results show that most teachers are aware of the media literacy which has changed socially, and show strong agreement that this changed literacy should be applied in the field of Korean language education. However, today's media literacy education is passive. Although teachers generally understand the dynamic features of newly emerging digital media, it remains as a tool in class. The teachers pointed out that device problems such as device environment and the spread of media are one of the many reasons for such passive usage. However, the more fundamental problem is that the new communication environment has not been reflected in the curriculum actively. Teachers thought that media literacy has a close relationship with Korean proficiency. Also, they saw that this kind of media literacy will be required for Korean learners in the future with more importance. Based on the results of the study, this paper argues that Korean language education needs to accept and reflect the changes of media in the curriculum.

• International Journal of Advanced Culture Technology
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• 제11권3호
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• pp.18-25
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• 2023

The COVID-19 pandemic has had a significant impact on the educational landscape for students across the globe, leading to a shift towards long-term online learning. This study aims to examine the changes in the health status of college and university students before and after the transition to online classes. We conducted a survey questionnaire among 200 students enrolled at K University in Gangwon-do, including participants from both the Department of Visual Optics and the Department of Physical Therapy. The survey employed a 5-point Likert scale to evaluate a range of health-related factors, including physical and mental well-being, alterations in lifestyle, and academic performance. Both male and female students experienced a decline in physical strength and exercise during the online class period, while mental health and overall happiness showed improvement, particularly among female students. Notable shifts in lifestyle emerged, including an increased usage of electronic devices and enhanced familial connections. The study also shed light on intriguing trends related to academic accomplishments and adherence to official quarantine guidelines. In sum, the findings of this study offer valuable foundational information for the maintenance of students' well-being during online learning, as well as the development of effective strategies for online education in future academic settings.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 추계학술대회
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• pp.478-481
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• 2021

코로나-19 사태가 발생으로 인해 비대면 수업으로 전환되면서, 학교 현장에서의 교육은 전통적 강의식 수업과 다른 방향으로 흘러가고 있다. 이에 따라 여러 온라인 플랫폼이 새롭게 등장하였고, 우리 교육은 수업 변화의 과도기에 놓여있다. 그 결과로 여러 가지 명암이 분명히 존재하는 현재, 대표적으로 사용되고 있는 온라인 플랫폼 조사 후, 코로나-19 발생 이전의 보고서와 비교하여, 정의적·심동적·가치 인식의 측면에서 학생들의 ICT 활용 능력 인식 변화를 확인하고자 한다.

• 정보관리학회지
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• 제40권4호
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• pp.279-306
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• 2023

본 연구는 다양한 관점의 이용요구가 혼재되어있는 독서자료의 속성을 파악하기 위해, 도서의 동시이용 (동시대출, 동시구매) 데이터에 기반하여 독서자료의 선택 및 이용과 관계된 서지적 속성을 분석하였다. KDC 주제, 독자대상, 이용자 연령 관련 26개 하위 속성 단위로 구분하여 서지적 속성 용어의 동시출현행렬을 생성하고 네트워크 분석을 수행한 결과, 독서자료의 서지적 속성의 세부 내용 및 두드러진 매개 역할을 파악하였다. 본 연구의 결과는 향후 도서관 OPAC을 비롯한 독서정보 시스템의 패싯 설계에 도움이 될 것이다.

• 한국정보시스템학회지:정보시스템연구
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• 제33권1호
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• pp.69-90
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• 2024

Purpose In this paper, among the four information vulnerable groups(disabled, elderly, low-income, farmers and fishermen), the mediating effect of digital device usage attitudes in the effect of digital information utilization level of farmers and fishermen with a large digital information gap with the general public on life satisfaction was verified. Design/methodology/approach This study summarizes existing research related to the digital information gap between farmers and fishermen, and the empirical analysis is based on hierarchical regression analysis based on the 2022 Digital Information Gap Report (survey data on 2,200 farmers and fishermen) published by the Korea Intelligence Information Society Promotion Agency. Among the four major information vulnerable groups (the disabled, the elderly, low-income groups, and farmers and fishermen), attitudes toward using digital devices were examined in terms of the impact of the level of digital information use on life satisfaction among farmers and fishermen, who have a relatively large digital information gap with the general public. It was verified as a mediating effect. Findings As a result of the empirical analysis, attitudes toward the use of digital devices were found to play a mediating role in the impact of the level of digital information use on life satisfaction.

• Journal of Microbiology and Biotechnology
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• 제33권11호
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• pp.1412-1419
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• 2023

Retroviral integration into ancient vertebrate genomes left traces that can shed light on the early history of viruses. In this study, we explored the early evolution of retroviruses by isolating nine Spuma endogenous retroviruses (ERVs) and one Epsilon ERV from the genomes of Agnatha and Chondrichthyes. Phylogenetic analysis of protein sequences revealed a striking pattern of co-evolution between jawless fish ERV and their host, while shark ERV underwent ancient cross-class viral transmission with jawless fish, ray-finned fish, and amphibians. Nucleotide sequence analysis showed that jawless fish ERV emerged in the Palaeozoic period, relatively later than ray-finned fish ERV. Moreover, codon analysis suggested that the jawless fish ERV employed an infection strategy that mimics the host codon. The genealogical diversity of ERVs in the jawless fish genome highlights the importance of studying different viral species. Overall, our findings provide valuable insights into the evolution of retroviruses and their interactions with their hosts.

• Journal of Microbiology and Biotechnology
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• 제34권6호
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• pp.1189-1196
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• 2024

Bacterial resistance to commonly used antibiotics is one of the major challenges to be solved today. Bacteriophage endolysins (Lysins) have become a hot research topic as a new class of antibacterial agents. They have promising applications in bacterial infection prevention and control in multiple fields, such as livestock and poultry farming, food safety, clinical medicine and pathogen detection. However, many phage endolysins display low bactericidal activities, short half-life and narrow lytic spectrums. Therefore, some methods have been used to improve the enzyme properties (bactericidal activity, lysis spectrum, stability and targeting the substrate, etc) of bacteriophage endolysins, including deletion or addition of domains, DNA mutagenesis, chimerization of domains, fusion to the membrane-penetrating peptides, fusion with domains targeting outer membrane transport systems, encapsulation, the usage of outer membrane permeabilizers. In this review, research progress on the strategies for improving their enzyme properties are systematically presented, with a view to provide references for the development of lysins with excellent performances.

• 동양고전연구
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• 제48호
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• pp.311-340
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• 2012

본 연구는 이화여자대학교의 심화 글쓰기 과목으로 개설된 <명작명문 읽기와 쓰기> 강좌에서 "장자(莊子)" <제물론(齊物論)>을 읽기 자료로 설정하고 수업한 사례를 분석한 것이다. 동양 고전 텍스트를 대학 교양교육의 자료를 삼았을 때 나타나는 특징과 효과를 고찰하려는 것이 본고의 목적이다. 본고에서는 학생들이 "장자(莊子)" <제물론(齊物論)>을 읽고 발제문을 작성하여 토론하는 것을 이해 단계로, 이를 바탕으로 글쓰기 과제를 수행한 것을 평가 단계로 나누어서 각각의 특징을 살펴보고, 그 의의를 논의하였다. 특히, 학생들의 글쓰기 과제를 분석하여 파악한 <제물론(齊物論)>의 평가 단계에서는 상대주의적 관점 인식, 자아 성찰적 요소 발견, 소통의 메시지를 수용하는 특징을 보였다. 장자와 글쓰기 교육을 연계함으로써 다양성의 시대와 가치의 재발견, 진정한 자아 탐색의 의미 제시, 열린 사고와 창조적 글쓰기라는 의의와 효과를 도출할 수 있었다. 이러한 연구는 고전의 현대적 재해석이라는 의의와 고전 텍스트의 교육적 활용 사례에 대한 시사점을 제공해줄 수 있을 것이라 예상된다.