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이경락,최재신,김한순,Lee, Gyeong-Rak,Choe, Jae-Sin,Kim, Han-Sun 한국조류학회(藻類) 2003 ALGAE Vol.18 No.4
The physico-chemical characteristics and seasonal variations of phytoplankton community were investigated in the Paksil and Jungyang marshes. Water and phytoplankton samples for analyses were collected monthly from April 2002 to March 2003. A total of 421 taxa of phytoplankton belonging to eight classes identified. The number of taxa was highest in Bacillariophyceae, followed by Chlorophyceae, Euglenophyceae, Cyanophyceae, Chrysophyceae, Dinophyceae, Xanthophyceae and Cryptophyceae. The standing crops ranged from 1.25 ${\times}$ $10^6$ to 5.85 ${\times}$ $10^6$ cells ${\cdot}l^{-1}$ in Paksil marsh and 0.25 to 9.63 ${\times}$ $10^6$ cells ${\cdot}l^{-1}$ in Jungyang marsh. The highest algal density at Paksil marsh was recorded in October during the high development of Chlorococcales while the lowest value occured in July. In the Jungyang marsh, the maximum algal density was recorded in October when Cryptomonas sp. and Mallomonas sp. accounted for 64% to total cell numbers and the lowest cell density was observed in January due to the decrease of Chlorophyceae. The dominant species were represented by Euglena proxima, Trachelomonas oblonga, Trachelomonas volvocina of Euglenophyceae, Dictyosphaerium pulchellum, Monoraphidium griffithii, Oocystis parva of Chlorophyceae, Dinobryon sertularia, Kephyrion rubri-claustri of Chrysophyceae, Achnanthes minutissima of Bacillariophyceae and Cryptomonas sp. of Cryptophyceae in the Paksil and Jungyang marshes. Phytoplankton diversity(H’) and dominance index varied rather irregularly throughout the sampling period but they were significantly correlated. The highest diversity(H’Paksil = 3.68, H’Jungyang = 3.63) coincided with the lowest values of dominance(DPaksil = 0.05, DJungyang = 0.05)
낙동강에서 유기오염 및 SS 농도 변화에 따른 DOC 농도 변화의 특성
이규열 ( Kyu Yeol Lee ),김주언 ( Ju Eon Kim ),이권철 ( Kwon Chul Lee ),이경락 ( Kyung Lak Lee ),이인정 ( In Jung Lee ),임태효 ( Tea Hyo Im ) 한국물환경학회 2013 한국물환경학회지 Vol.29 No.4
Temporal increase of SS induces concentrations in various forms of organic matter including BOD, COD, TOC. Consequently, it causes hard to identify sources of water pollution during or after precipitation. The objective of this study is to investigate variations of DOC concentration caused by increase of flow and changes of external factors in river by comparing to SS concentration. In results, monitoring sites (e.g., Banbyeonchen) consisting of hard riverbed showed high correlation between SS and organic matters, except BOD. On the contrary, other sites (e.g., Naesungcheon) where riverbed consists of sand were found in a wide range of annual fluctuation in SS level, whereas these sites showed a narrow range in annual DOC fluctuation. In Gumhogang and Namgang, a lower correlation between SS and other factors was found most likely because of high concentration in organic matter. However, lower annual fluctuation values of DOC were observed in comparison to those of COD and TOC. Similar results were also confirmed in main river sites, Sangju and Mulgeum. In conclusion, DOC concentration is better indicator for monitoring organic matter which cannot be provided by BOD, COD, TOC in the Nakdong river basin.
이경락(Kyeongrak Lee),이상준(Sangjoon Lee),김상진(Sangjin Kim) 한국인터넷전자상거래학회 2015 인터넷전자상거래연구 Vol.15 No.4
Online automobile insurance means to provide automobile insurance services in cyberspace by leveraging the Internet and information communication. In previous relevant papers it has not been explained subscription intention with the interaction among users by social relationships, which is the most important features of the online automobile insurance. In this paper, we proposed an empirical model for the intention of continuous use of online automobile insurance by applying the uses and gratification theory. This model was developed based on a literature review and interviews with non-subscribers of online automobile insurance. And two antecedents factors, the relationship connection(bridging) and the relationship existence(bonding) was introduced based on social network theory for the main reasons of non-subscribing. We verified that the connectivity, informativeness, bridging and bonding had significant influence on the satisfaction of subscribing an online automobile insurance by regression analysis with statistically analyzed survey data. And we also verified the user satisfaction had significant influence on the continued usage intention. We found that the bridging and bonding appeared to be greater impact on user intention rather than connectivity and informativeness. It can be seen that forming customers relationship based on SNS is differentiation strategy compared with traditional pricing strategy in online automobile insurance. Contribution points of this paper are that the bridging and bonding factors used in social network theory and social capital theory are developed for online automobile insurance and that the significant relationship between satisfaction of subscribing online automobile insurance and continued usage intention was verified.