http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Sangmin Hyun (검색결과 166 건)
- 무료
- 기관 내 무료
- 유료
-
Sangmin Hyun,Naokaze Ahagon,Ho-Il Yoon 한국지질과학협의회 2005 Geosciences Journal Vol.9 No.3
Sediments from Ocean Driling Program (ODP)Sites 980 and 983 in the North Atlantic Ocean were analyzed toobtain evidence of long-range Milankovitch cycles and to examinethe cycles’ effect on the paleoceanographic evolution of the NorthAtlantic Ocean. Wide cyclic variations in total organic carbon andbiogenic carbonate occur throughout the columns at both sites andprovide distinctive characteristics of both sediment groups. Spec-tral modeling of these variations shows typical 100-ka cyclic vari-ations in both the total organic carbon (TOC) and carbonate recordsat Site 980, although this 10-ka Milankovitch frequency occursonly in the uper, ~472.5 ka, section of the core. In Site 983, only400-ka cycle in carbonate is observed but the 10-ka cycle in TOCand carbonate is absent. The terrigenous content, expressed interms of K, Al, Ti, and Th, also shows strong 100-ka and 400-kacyclic variations at Site 983. The earth’s eccentricity as expressedand precession (23-ka) are important characteristics of North Atlan-tic Ocean sediments. Milankovitch pulse differences in carbonate,TOC at the two sites likely arise from the evolution of paleocean-ography. The dilution of carbonate fractions by terrigenous mate-rials (indicated by the cyclical behavior of trace elements) at Site 983is one of plausible explanation. Climatic warming over the last 600ka probably caused the differences in the sedimentary cycles at thetwo sites; induced meltwater discharge is recorded in the terrige-nous record, and changes in the oceanic circulation system arerelated to major glacialinterglacial climatic episodes that probablyunderlie the differences in the cyclical records.
-
Hyun Sangmin,Lim Dhong-il,Yoo Hai-Soo The Korean Society of Economic and Environmental G 2006 자원환경지질 Vol.39 No.1
Geochemical and sedimentological analyses of sediment piston core were used to trace paleoceanographic environmental changes in the East China Sea. The analytical results revealed three lithostratigraphic units (I, II, and III) corresponding to a highstand stage, a transgressive stage, and a lowstand stage, respectively. Accelerator mass spectrometry (AMS) $^{14}C$ dated the boundaries between the units as 7 ka and II ka. That is, Unit I extended from the present to 7 ka, Unit II occupied a transitional episode from 7 to 11 ka, and Unit III was older than 11 ka. The transitional episode was characterized by sudden fluctuations in various geochemical proxies. Most strikingly, there was a gradual upward increase in both carbonate and total organic carbon (TOe) contents post-7 ka, during which time the ${\delta}^{l3}C$ values of organic material increased to a constant value. The gradual upward increase in the TOC and $CaCO_3$ contents in Unit I were accompanied by slight variations in grain size that probably reflect a stable modern oceanographic environment. Within Unit II (7 to 11 ka), the geochemical signals were characterized by abrupt and steep fluctuations, typical of a transgressive stage. Vertical mixing may have provoked an increase in productivity during this interval, with large amounts of terrigenous organic matter and/or freshwater being supplied by neighboring rivers. The geochemical signals remained stable throughout Unit III but exhibited different patterns than signals in Unit I. The high terrigenous organic matter content of Unit III suggests correspondence to a lowstand stage.
-
Sangmin Hyun,Dhong-il Lim,Hai-Soo Yoo 대한자원환경지질학회 2006 자원환경지질 Vol.39 No.1
Geochemical and sedimentological analyses of sediment piston core were used to trace paleoceanographic environmental changes in the East China Sea. The analytical results revealed three lithostratigraphic units (I, II, and III) corresponding to a highstand stage, a transgressive stage, and a lowstand stage, respectively. Accelerator mass spectrometry(AMS) 14C dated the boundaries between the units as 7 ka and 11 ka. That is, Unit I extended from the present to 7 ka, Unit II occupied a transitional episode from 7 to 11 ka, and Unit III was older than 11 ka. The transitional episode was characterized by sudden fluctuations in various geochemical proxies. Most strikingly, there was a gradual upward increase in both carbonate and total organic carbon (TOC) contents post-7 ka, during which time the δ13C values of organic material increased to a constant value. The gradual upward increase in the TOC and CaCO3 contents in Unit I were accompanied by slight variations in grain size that probably reflect a stable modern oceanographic environment. Within Unit II (7 to 11 ka), the geochemical signals were characterized by abrupt and steep fluctuations, typical of a transgressive stage. Vertical mixing may have provoked an increase in productivity during this interval, with large amounts of terrigenous organic matter and/or freshwater being supplied by neighboring rivers. The geochemical signals remained stable throughout Unit III but exhibited different patterns than signals in Unit I. The high terrigenous organic matter content of Unit III suggests correspondence to a lowstand stage.
-
Hyun, Sangmin,Kim, Eun-Soo,Paeng, Woo-Hyun 한국환경과학회 2004 한국환경과학회지 Vol.13 No.5
Five sediment cores from the tidal flat of artificial Lake Shihwa are analyzed in terms of sedimentology and geochemistry to evaluate the heavy metal contamination and redox condition of surficial sediment following the Shihwa seawall construction. The variability of concentrations of various elements depends on the depositional environment, and reflects the various redox conditions and sediment provenances. The amounts of Ti and Al and their ratio of Ti/Al with respect to Li clearly indicate that there is an anthropogenic contribution to the surficial sediment. The high concentrations of heavy metals suggest an anthropogenic contribution at ST. 34 and ST. 22. Concentrations of most elements (Cr, Cu, Zn and Pb) are higher near the Shihwa-Banwol industrial complex than in the central part of Lake Shihwa. Concentrations of heavy metal in surficial sediment near the Shihwa-Banwol industrial complex are two to eight times higher than in the center of Lake Shihwa. Enrichment factors (EF), which are normalized by the unpolluted shale, suggests a significant metallic contamination near the Shihwa-Banwol industrial complex (SBIC). The redox condition is divided into two anoxic and mixed oxic/suboxic zones based on the carbon:sulfur (C/S) ratios of organic matter and elemental relationships. Correlations among geochemical elements Mn, U and Mo are significantly different from site to site, and may therefore be an indicator of the spatial redox condition. Controlling factors for switching anoxic/oxic conditions are thought to be water depth and the differences in industrial effluent supply. The variations of the Cu/Mn ratio in the sediments confirms above mentioned spatial differences of a redox condition in part, and therefore shows a location-dependence redox condition in sediments at four other sites. The redox condition of the surficial sediment characteristics of the Shihwa Lake are controlled by its geographic location and water depth.Five sediment cores from the tidal flat of artificial Lake Shihwa are analyzed in terms of sedimentology and geochemistry to evaluate the heavy metal contamination and redox condition of surficial sediment following the Shihwa seawall construction. The variability of concentrations of various elements depends on the depositional environment, and reflects the various redox conditions and sediment provenances. The amounts of Ti and Al and their ratio of Ti/Al with respect to Li clearly indicate that there is an anthropogenic contribution to the surficial sediment. The high concentrations of heavy metals suggest an anthropogenic contribution at ST. 34 and ST. 22. Concentrations of most elements (Cr, Cu, Zn and Pb) are higher near the Shihwa-Banwol industrial complex than in the central part of Lake Shihwa. Concentrations of heavy metal in surficial sediment near the Shihwa-Banwol industrial complex are two to eight times higher than in the center of Lake Shihwa. Enrichment factors (EF), which are normalized by the unpolluted shale, suggests a significant metallic contamination near the Shihwa-Banwol industrial complex (SBIC). The redox condition is divided into two anoxic and mixed oxic/suboxic zones based on the carbon:sulfur (C/S) ratios of organic matter and elemental relationships. Correlations among geochemical elements Mn, U and Mo are significantly different from site to site, and may therefore be an indicator of the spatial redox condition. Controlling factors for switching anoxic/oxic conditions are thought to be water depth and the differences in industrial effluent supply. The variations of the Cu/Mn ratio in the sediments confirms above mentioned spatial differences of a redox condition in part, and therefore shows a location-dependence redox condition in sediments at four other sites. The redox condition of the surficial sediment characteristics of the Shihwa Lake are controlled by its geographic location and water depth.
-
Common complications after auricular piercing in Korea: case reviews and treatment
Sangmin Hyun 대한미용의학회 2017 대한미용의학회지 Vol.1 No.2
Auricular piercing, including earlobe piercing, is the most popular procedure for penetration of jewelry into the body. As the number of preferred auricular piercings is increasing, the number of related complications is also increasing. Complications following piercing procedures are variable and various treatments have been introduced. I aimed to introduce the various complications that arise after auricular piercing and suggest appropriate treatments based on my clinical experience. I conducted article reviews and reflected on clinical experience to discuss the appropriate treatments for complications after piercing. There have been advancements in understanding of complications after auricular piercing and its treatments. The sharing of this knowledge has led to improved treatments and management. Auricular piercing is a simple procedure, but the treatment of complications is often difficult and troublesome. As the number of preferred piercings is increasing, research on the treatment of complications should be continued. Level of Evidence: Level V
-
-
-
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
