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가학광산 주변 중금속 함유 토양입자의 이화학적·광물학적 특성연구
이충현,이선용,박찬오,김종원,이상환,박미정,정문영,이영재,Lee, Choong Hyun,Lee, Seon Yong,Park, Chan Oh,Kim, Jong Won,Lee, Sang Hwan,Park, Mi Jeong,Jung, Moon Young,Lee, Young Jae 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.4
Soil samples collected in an area of Gahak Mine were investigated for the characterization of mineralogical and physicochemical properties of contaminants in soils. It is found that soils in the study area are contaminated by lead (Pb), copper (Cu), zinc (Zn), cadmium (Cd), in which their concentrations are 595.3 mg/kg, 184.9 mg/kg, 712.8 mg/kg, and 10.64 mg/kg, respectively. All the concentrations exceed the concern criteria of Korean standard. Upon distribution patterns of metals identified by the sequential extraction procedure, our results show that more than 50% of metals are found as a residual type, and 30% are accounted for the association of Fe/Mn oxides. Interestingly, XRD results show that minium (Pb<sub>3</sub>O<sub>4</sub>) and cuprite (Cu<sub>2</sub>O) are identified in the soil samples, suggesting that the sources of the contaminants for Pb and Cu are these minerals. In SEM images, tens of µm of Pb oxides and Pb silicate-minerals are observed. We, therefore, note that the contamination of metals in the study area results from the direct influx and disturbance of tailings. Our findings indicate that the characterization of physicochemical and mineralogical properties of contaminated soils is a critical factor and plays an important role in optimizing recovery treatments of soils contaminated in mine development areas.
Collagen Gel을 이용한 사람의 고환 조직배양에 관한연구
이충현,이상철,이선주,손준웅,장성구,김진일,채수응,Lee, Choong-Hyun,Lee, Sang-Cheol,Lee, Sun-Joo,Sohn, Joon-Woong,Chang, Sung-Goo,Kim, Jin-Il,Chai, Soo-Eung 대한생식의학회 1993 Clinical and Experimental Reproductive Medicine Vol.20 No.1
A recently developed collagen gel culture technique has been applied to study on growth in tissue of human testicular tissue. Minimum Eagle's medium supplemented with amino acid, 10% Fetal Bovine Serum and 0.1mM non-essential amino acid are emploid. Tissue fragments on collagan gel are fixed at time intervals for the histologic findings of testis. The mature spermatids are maintained for 2 weeks and can be observed until four weeks. But the rate of glucose consumption is increased contrary to histologic findings.
Pre-Service English Teachers’ Voices on Using Smartphones in Classrooms
이충현 한국외국어대학교 외국어교육연구소 2023 외국어교육연구 Vol.37 No.4
Mobile learning allows learners to learn anytime, anywhere, and offers various activities in language classes. However, smartphones are banned or rarely used in schools worldwide due to problems such as distractions, off-task activities, and mental health problems. This study explored pre-service English teachers' voices on using smartphones in schools. The study subjects were 109 students enrolled in the 3rd and 4th grades of the English education department at A University. Data collection instruments include discussion logs and interviews. The results are as follows: Only 29.4% of students used smartphones in English classrooms in secondary school. The students used them the most in vocabulary and listening order and thought of them very positively. The pros and cons were almost the same as those of the existing literature, e.g., portability learning, information searching, individualization, interactivity, etc. and distraction, interference of interaction, the temptation of off-task activities, etc. Students were satisfied with the advantages and said they helped learn to improve their language skills. 92.7% of students said they would use smartphones in English classes as teachers in the future. Based on the results of this study, practical teaching methods, activities, and follow-up experimental studies for effective smartphone use were suggested.
동시대 인체 조각에서 나타나는 재현 방식에 관한 연구 -데이비드 알트메이드와 올리버 라릭의 작업을 중심으로-
이충현,고경호 한국기초조형학회 2023 기초조형학연구 Vol.24 No.2
The fundamental role inherent to the medium of sculpture ever since antiquity has been in representing life and articulating their existence. Its essential role awakens the desensitized senses of men and enables us to attain to a higher dimension of our awareness and perception of our bodies. However, in the modern society with the expanded and ambiguous realm of time and space, the overflowing amount of digital images confusing our perception are often conceived as physical sculptures, inducing visual tactility. Therefore, in the current climate where the assertion for sculpture to exist as tangible material is becoming less convincing, more studies on the fundamental questions surrounding the existence of sculpture as a substantial art form are needed. To serve as a breakthrough to such issues, the purpose of this study lies in the examination of the representation of the human body in contemporary sculptures. The sculptures scrutinized in this study are limited to those depicting the human body in threedimensional materials. The approach of the study is to conduct a comparative analysis between the works of David Altmejd and Oliver Laric to examine the nonrepresentational attributes in their sculptures, concentrating on their divergent languages. First, the human body sculptures of the two artists are analyzed as substance representing not specific and direct but nonrepresentational subjects—space with infinite amount of energy, the formation and division of invisible material, and the moments of the modification of data that transcends the notions of the original and replication and creation of new versions. Second, the physical process of the artistic practice is examined. By uncovering the elements represented in human body sculptures such as materiality, virtuality, data, and nonhuman, the study will suggest the complex values derived from corporeal sculptures and support the path towards their enhanced understanding.
The effective Use of Live and Recorded Videm on Satellite TV and the Internet in FLT/L
이충현 한국멀티미디어언어교육학회 2004 멀티미디어 언어교육 Vol.7 No.1
The use of satellite TV (STV) and the Internet is now available to some extent at all levels, particularly in higher education, due to development in technology and rapid expansion in their use in today's society. Live and recorded videos on STV and the Internet are now familiar in foreign language teaching and learning (FLT/L) and seems to be the center of teachers' and students' interest. However, it is worth noticing that the most important consideration in using the technologies in FLT/L does not lie with their technical aspects, since technology develops and changes rapidly, but in the question of which technology can deliver which media, and how. Their effective use in FLT/L is related to their role and content, and how they can be integrated into the foreign language classroom. The purposes of this paper are, therefore: 1) to reconsider the positive features and limitations of video in the language classroom; 2) to discuss the effective use of video on STV and the Internet; 3) to suggest a model of teaching method and techniques in the use of video for the communicative language classroom.