서부 민간인출입통제구역 일대 둠벙의 저서성대형무척추동물 종 다양성 및 군집 특성

정현용,염철민,김재현,박신영,이예원,표진아,김승호 한국하천호수학회 2020 생태와 환경 Vol.53 No.2

Irrigation ponds, ‘dumbeong’, which are artificially constructed water resources for traditional farming, serve as a biological shelter connecting seasonally created rice paddy fields to local freshwater ecosystems. This 2018 study surveyed 143 irrigation ponds in the western Civilian Control Zone (CCZ) area from August to September, revealing species diversity and community characteristics of benthic macroinvertebrates. A total of 13,454 individuals of macroinvertebrates were captured and classified into 3 phyla, 5 classes, 17 orders, 59 families, 192 species. Among Insecta, the most frequently recorded order was Odonata, 55 spp. (33.7%), followed by Coleoptera, 52 spp. (31.9%), Hemiptera, 34 spp. (20.8%), Diptera, 17 spp. (9.8%), Ephemeroptera, 3 spp. (2.4%), Trichoptera, 1 spp. (0.6%) and Lepidoptera, 1 spp. (0.6%). Taxon of non-Insecta consisted of Mollusca, 14 spp. (48.2%), Annelida, 11 spp. (37.9%) and Arthropoda, 4 spp. (3.4%). The analysis of Diversity Index (H′), Species Richness Index (RI), Dominance Index (DI) and Evenness Index (J′) revealed the general stability of communities in the study sites. A total of 28 rare species were found in 98 study sites, including three endangered species designated by the Ministry of Environment. These results showed that the species diversity and rarity of macroinvertebrates in the study area were greater than those of previous research on lentic wetlands (lake, etc.) and national conserved wetlands (Upo-swamp, etc.) in Korea. A conservation planning of aquatic ecosystems in the western CCZ area, therefore, should focus on conservation of irrigation ponds.

국내 대형 건설회사의 안전관리 수준 향상방안

정현용,신원상,손창백 대한건축학회 2023 대한건축학회논문집 Vol.39 No.3

This study was conducted to identify the current safety management level of large domestic construction companies, compare it with pastsafety levels, and present improvement plans for areas that need future development. As a result, it was found that the current head officeand site safety management level of large domestic construction companies improved compared to the past, and the safety management levelof the head office improved somewhat more than the site. In addition, the safety management level of each group was maintained at a goodlevel in large domestic construction companies. However, the safety management level of group two was still relatively low compared togroup one, and the difference in these levels between groups still existed. The safety management level improvement plan was analyzed andsuggested for each group of large domestic construction companies. 본 연구는 국내 대형 건설회사를 대상으로 현재의 안전관리수준을 파악하여 과거의 안전수준과 비교하고, 향후 향상이 필요한 부분에 대한 개선방안을 제시하고자 수행되었다. 연구결과, 국내 대형 건설회사의 현재 본사와 현장의 안전관리수준은 과거에 비해 향상되었고, 본사의 안전관리수준이 현장보다 다소 더 많이 향상된 것으로 나타났다. 그리고, 국내 대형 건설회사의 그룹별 안전관리수준은 모두 양호한 수준을 유지하고 있었다. 그러나, 2그룹의 안전관리수준은 아직까지 1그룹에 비해 상대적으로 낮은 수준으로 그룹간의 안전관리수준 차이는 여전히 존재하였다. 국내 대형 건설회사의 각 그룹별로 안전관리수준 향상방안을 분석하고 이를 종합하여 국내 대형 건설회사의 안전관리수준 향상방안을 제안하였다.

COVID-19의 영향으로 인한 공업계 특성화 고등학교의 방과후학교 운영 실태 분석

정현용 한국방과후학교학회 2021 방과후학교연구 Vol.8 No.1

이 연구는 공업계 특성화 고등학교의 2018년~2020년 사이 방과후학교 운영실태를 분석하여 방과후학교의 주요 현황, 운영 성과, 문제점 등의 실태를 분석하고자 한다. 그리고 2020년은 COVID-19의 영향으로 많은 공업계 특성화 고등학교에서 방과후학교가 운영되지 못했는데, 이에 대한 대안을 제시하는 데 목적이 있다. 연구를 위하여 2018년~2020년 학교알리미 공개용 데이터 분석, 선행연구, 방과후학교 운영 길라잡이 등의 문헌분석을 하였다. 공업계 특성화 고등학교의 방과후학교는 초･중･일반고의 방과후학교처럼 교과, 특기･적성 프로그램 외에 직업교육, 자격증 프로그램 등이 더 있다. COVID-19의 영향으로 2019년 대비 운영된 프로그램 수는 43.9%, 방과후학교 참여 학생 수는 37.9% 수준으로 운영되었다. 공업계 특성화 고등학교의 방과후학교는 COVID-19가 단기간에 종식되지 않으리라고 예측되어 기존의 대면 방식보다 비대면 방식의 프로그램 개발과 보급의 필요성이 더욱 커지고 있다. This study intends to analyze the actual operational conditions including main situation, performance and problems of after-school programs of technical specialized high school between 2018 and 2020. It, also, aims to provide an alternative as many technical specialized high schools failed to operate after-school programs due to COVID-19 in 2020. For this study, the analysis on public data of school notification from 2018 to 2020, prior research and the literature analysis on the operation guidelines for after-school program were conducted. The after-school program of technical specialized high school includes vocational education and certificate program in addition to subjects and specialty & aptitude program in the after-school programs of elementary, middle and general high school. Under the influence of COVID-19, the number of after-school programs operated was about 43.9% and that of students who took part in the programs was about 39.9% compared to 2019. The necessity of developing and deploying non-face-to-face approach of after-school program of technical specialized high school is growing more than conventional face-to-face one as COVID-19 would not be expected to come to an end in a short period.

새기르기의 실태 -청홍조

정현용 대한양계협회 1974 월간 양계 Vol.6 No.4

Session 3 : Experience of Treatment for Intractable Functional GI Disorders ; Diagnostic and therapeutic strategies of intractable dyspepsia

정현용 대한소화기학회 2004 대한소화기학회 춘계학술대회 Vol.2004 No.-

근간에 기능성 소화불량증의 증상 양상에 따른 병태생리에 대한 새로운 개념의 정립으로 멀지 않은 시기에 우수한 치료법이 개발될 것으로 기대된다. 하지만 현재의 치료는 증상에 따라서 위장관 운동 촉진제와 위산 분비 억제제의 경험적인 사용이 전부인 상태이다. H.pylori 감염과 기능성 소화불량증의 강한 연관 관계 가 입증되지 않았지만, 서구에서는 경제적인 측면을 고려한 우선적인 제균치료가 위내시경검사를 우선한다. 우리나라와 같이 위암의 빈도가 높고, H. pylori 감염율이 높으며 항생제 내성이 문제가 되는 경우는 우선적으로 위내시경검사를 해서 기질적인 소화불량증을 배제하는 것이 바람직하다. 일정 기간의 경험적 약물 치료에 반응이 없는 난치성 소화불량증의 치료는 더욱 어렵다. 식이 요소에 대해 주의를 환기시키고, 보다 강력 한 약물의 사용이나 복합 처방 및 새로운 약물들을 사용하며, 정신과 의사와의 협진 및 허브나 민간 요법을 고려한다.

Web 기반 수업 프로그램의 개발과 운영

정현용 한국스쿨넷학회 1999 학술발표 논문집 Vol.1999 No.1

[특집/자동차 안전] 전방 에어백과 관련 법규

정현용 한국자동차공학회 2000 오토저널 Vol.22 No.2

종계의 케이지 사육

정현용 대한양계협회 1973 월간 양계 Vol.5 No.9

2021학년도 A 대학 신입생의 대학 생활 실태 연구

정현용 大田大學校 社會科學硏究所 2022 社會科學論文集 Vol.- No.-

This paper puts an in-depth study on the status of college life of first-year students from A university intending to promote understandingand adaptation and enhance welfare and campus life guidance for students through improving the quality of psychological counseling programs andprograms to encourage career exploration and self-development. A total of 543(27.6%) out of 1,966 first-year students from A universityparticipated in the questionnaire for this study. Firstly, 57.7% of first-year students had chosen A university as the second priority, and they obtainedadmission information from the university website. Secondly, 30.5% of first-year students have worked as part-time workers and answered that the most crucial thing in college life is managing academic performance and GPA. Thirdly, it revealed that the impression for a university and pride from first-year students was in the early 40~60%, and the satisfaction of supporting services was in the early20~30%. Fourthly, it turned out that they are facing various types of difficulties in their college life due to COVID-19, and 20% to 30% of students have thought of taking a year off, dropping out, and getting transferred. This reality suggests that academic and career-related counseling fromsupervising professors is required to help them settle down on campus inthe early stages of college life and functions of the student counselingcenter to implement a wide range of activities for enhancing mental healthand campus life

Design Optimization of Hybrid-Integrated 20-Gb/s Optical Receivers

정현용,연진성,최우영 대한전자공학회 2014 Journal of semiconductor technology and science Vol.14 No.4

This paper presents a 20-Gb/s optical receiver circuit fabricated with standard 65-nm CMOS technology. Our receiver circuits are designed with consideration for parasitic inductance and capacitance due to bonding wires connecting the photodetector and the circuit realized separately. Such parasitic inductance and capacitance usually disturb the high-speed performance but, with careful circuit design, we achieve optimized wide and flat response. The receiver circuit is composed of a transimpedance amplifier (TIA) with a DC-balancing buffer, a post amplifier (PA), and an output buffer. The TIA is designed in the shunt-feedback configuration with inductive peaking. The PA is composed of a 6-stage differential amplifier having interleaved active feedback. The receiver circuit is mounted on a FR4 PCB and wire-bonded to an equivalent circuit that emulates a photodetector. The measured transimpedance gain and 3-dB bandwidth of our optical receiver circuit is 84 dBΩ and 12 GHz, respectively. 20-Gb/s 231−1 electrical pseudo-random bit sequence data are successfully received with the bit-error rate less than 10−12. The receiver circuit has chip area of 0.5 mm × 0.44 mm and it consumes excluding the output buffer 84 mW with 1.2-V supply voltage.