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서영석,조민,오병택,Seo, Young-Seok,Cho, Min,Oh, Byung-Taek 한국지하수토양환경학회 2013 지하수토양환경 Vol.18 No.1
Water quality and contamination of sediment is a growing concern in the Iksan stream of Korea. Heavy metal contamination and changes in the physicochemical properties of the stream were evaluated. Water and sediment samples were collected from six sites during the dry and rainy seasons; pH, DO, EC, ORP, turbidity, $PO_4$-P, $NO_3$-N and selected heavy metals (Cu, Pb, Ni, As, Zn, Cd, Hg) were measured. Results showed almost no change in pH between seasons. DO was highest at site 2 (~2.63 mg/L) in the dry season; EC (1,540 ms/m) was greatest at site 1 in both seasons. The ORP gradually increased from the dry to rainy season at most of the sites and was highest at site 5. Turbidity was highest at site 1 and gradually decreased from the dry to rainy season at all sites except site 3. $PO_4$-P ranged from a high of 1,193mg/L at site 1 to in the dry season to a low of ~1.2 mg/L at site 4. In contrast, $NO_3$-N was highest at site 3 in the rainy season (12,531 mg/L). Among the heavy metals measured, Cu and Zn concentrations were highest at all sediment sites. Cu and Zn are added to livestock feed to improve reproductive rates and can be carried to the stream with manure. Transport of sediment and heavy metals during the rainy season is the major source of stream contamination and it is important to continue monitoring and take necessary action in these areas.
Bi 첨가 알루미노실리케이트 유리에서 Li 및 Ge 공첨가가 광 특성에 미치는 영향
서영석,Seo, Young-Seok 한국광학회 2007 한국광학회지 Vol.18 No.3
The possibility of improving amplification characteristics and lowering the melting point of bismuth-doped aluminosilicate glass as a new amplification material, which has broadband near-infrared emission at 1300 nm regions, was investigated. Spectroscopic analysis of bismuth-doped aluminosilicate glass shows that the addition of an alkali metal oxide, $Li_{2}O$ increases FWHM of fluorescence spectrum but decreases fluorescence intensity, while $GeO_{2}$ composition increases both FWHM of fluorescence spectrum and fluorescence intensity. Also, excellent optical amplification gain characteristics in a $GeO_{2}$-added sample were observed. 근적외선에서 발광하는 새로운 증폭 매질인 Bi 첨가 알루미노실리케이트 유리의 용융 온도를 낮추면서도 증폭 특성이 향상될 수 있도록 금속 산화물을 첨가한 샘플을 제작하여 분광학적 특성을 분석하였다. $Li_{2}O$의 조성비가 증가하면 형광스펙트럼의 반폭치는 증가하지만 형광 강도가 저하되고, $GeO_{2}$의 영향으로는 반폭치와 형광 강도가 동시에 증가하였다. $GeO_{2}$를 첨가한 시료에서 광 증폭 특성을 측정한 결과, 이전의 벌크 샘플에서 얻었던 것보다 우수한 증폭 특성을 가지고 있음을 확인하였다.
서영석(Young Seok Seo),조화진(Hwa Jin Cho),안하얀(Ha Yan An),이정선(Jung Sun Lee) 한국교육심리학회 2012 敎育心理硏究 Vol.26 No.3
본 연구에서는 외상사건에 대한 DSM PTSD 진단기준과 학자들의 정의 및 경험적 연구결과를 토대로 외상사건을 포괄적으로 정의하고, 우리나라 청소년들이 경험하는 외상사건의 종류, 빈도 및 외상 관련 증상을 실증적으로 확인하고자 하였다. 이를 위해 전국에 거주하는 9세에서 24세의 청소년을 대상으로 지금까지 살면서 경험한 외상사건을 조사하였고, 1274명의 자료를 질적 방법과 양적 방법을 사용하여 분석하였다. 합의적 질적 방법을 사용하여 자료를 분석한 결과 총 43가지의 외상사건 범주가 도출되었고, 이 중 기존의 외상사건 질문지에 구체적인 외상사건으로 포함되어 있지 않은 24가지의 외상사건이 보고되었다(예, ``(가족 이외에서 경험한) 관계 실패, 심각한 거절, 갈등 경험 또는 목격``, ``학업, 일에서의 실패나 어려움``). 한편, 응답자의 68.1%가 지금까지 한 건 이상의 외상사건을 경험한 것으로 나타났으며, 남성은 ``교통사고``를 가장 많이 보고하였고 여성은 ``(가족 이외에서 경험한) 관계 실패, 심각한 거절, 갈등 경험 또는 목격``을 가장 많이 보고하였다. PTSD 증상 수준이 상대적으로 높은 집단(잠재적 PDSD집단)에서는 가족 이외의 관계 실패뿐 아니라 가족 내에서의 갈등이나 심리적 폭력을 많이 경험한 것으로 나타났다. 잠재적 PTSD 집단에 포함된 비율은 성별과 학교급에 따라 다르지 않은 것으로 나타났다. 주요 연구결과를 중심으로 교육 및 상담실제에 대한 시사점을 논하였다. The primary purpose of this study was to empirically examine the types and prevalence of traumatic events in a nationwide sample of South Korean adolescents between the ages of 9 and 24 (N = 1274) using online and offline surveys. We also investigated the types of events that are most likely to lead to posttraumatic stress disorder (PTSD). Consensual qualitative research (CQR) methodology revealed that a total of 43 discrete types of traumatic events were identified, including 24 new ones (e. g., relationship failures, failure or hardship in schoolwork). Most respondents (68.1%) reported having experienced a traumatic event in their lifetime; men reported traffic accident and women reported relationship failures as the most common event, Lifetime exposure to relationship failures as well as family conflict including psychological abuse were associated with higher PTSD symptoms. Women reported more traumatic events than did men, but no differences were found in terms of the proportion of those who meet criteria for PTSD by participant gender and school level. Implications for education and counseling practice are discussed.
환경에서 식물의 생육과 발달에 영향을 주는 의약품 성분들의 탐색
서영석 ( Young-seok Seo ),김강민 ( Kamgmin Kim ),조민 ( Min Cho ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Residual drug substances have been suggested to act as xenobiotics potentially affecting the growth of various living organisms in the environment. Here, we screened 70 pharmaceutical ingradients of which existences were verified in environment for their abilities to modulate plant growth and developmental processes. We introduced two types of transgenic Arabidopsis lines harboring pDR5:GUS and pARR6:LUCIFERASE which were engineered to report the signal intensities of two major phytohormones (i.e. auxin and cytokinin), respectively. A dozens of chemicals modulating the signaling outputs of auxin and cytokinin were selected and subjected to be further monitored in physiological aspects. As a representative among them, dichlofenac which was an active ingradient of many nonsteroidal anti-inflammatory drug (NSAID) significantly inhibited the growth of Arabidopsis seedling. In addition, Arabidopsis exhibited the altered tropisms and root systemic architectures (RSA) in the presence of 10 micromolar dichlofenac. The expressions of several auxin and cytokinin responsive genes were also modified according to the exogenous treatment of dichlofenac. Combined with other current knowledges, we suggested that dichlofenac might act as inhibitor of oxygenases involved in auxin biosynthesis. Similarly to dichlofenac's case, our approaches will be broaden to identify more pharmaceutical ingradients modulating plant growth, which will provide the insights into environmental biology of medical xenobiotics yet to be known.
환경에서 식물의 생육과 발달에 영향을 주는 의약품 성분들의 탐색
서영석 ( Young-seok Seo ),김강민 ( Kamgmin Kim ),조민 ( Min Cho ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Residual drug substances have been suggested to act as xenobiotics potentially affecting the growth of various living organisms in the environment. Here, we screened 70 pharmaceutical ingradients of which existences were verified in environment for their abilities to modulate plant growth and developmental processes. We introduced two types of transgenic Arabidopsis lines harboring pDR5:GUS and pARR6:LUCIFERASE which were engineered to report the signal intensities of two major phytohormones (i.e. auxin and cytokinin), respectively. A dozens of chemicals modulating the signaling outputs of auxin and cytokinin were selected and subjected to be further monitored in physiological aspects. As a representative among them, dichlofenac which was an active ingradient of many nonsteroidal anti-inflammatory drug (NSAID) significantly inhibited the growth of Arabidopsis seedling. In addition, Arabidopsis exhibited the altered tropisms and root systemic architectures (RSA) in the presence of 10 micromolar dichlofenac. The expressions of several auxin and cytokinin responsive genes were also modified according to the exogenous treatment of dichlofenac. Combined with other current knowledges, we suggested that dichlofenac might act as inhibitor of oxygenases involved in auxin biosynthesis. Similarly to dichlofenac's case, our approaches will be broaden to identify more pharmaceutical ingradients modulating plant growth, which will provide the insights into environmental biology of medical xenobiotics yet to be known.
건축물조명의 휘도분석을 통한 미디어파사드의 빛공해 관리방안 마련 연구
서영석(Young-Seok Seo),오민석(Min-Seok Oh),김회서(Hway-Suh Kim) 한국생활환경학회 2012 한국생활환경학회지 Vol.19 No.6
In domestic, it defines the rules used to implement "The Light Pollution" about the senseless outdoor lighting on February this year. However, there are only general standards to regulate the light pollution. Therefore, it is imperative to setup the database and classify the types of lightings so as to apply the light pollution standards to the media facades. Finally, this study suggests a viable lighting pollution regulation for the installation and management of the architectural lightings.