• 대한환경공학회지
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• 제39권11호
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• pp.641-649
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• 2017

본 연구에서는 오염원의 변화 특성이 다양한 임진강유역을 대상으로 통계분석을 이용하여 상관분석, 주성분 및 요인분석, 군집분석을 통해 수질특성을 파악하였다. 신천3 지점의 평균 수질농도가 BOD 13.4 mg/L, COD 19.9 mg/L, TN 11.145 mg/L, TP 0.336 mg/L, TOC 14.2 mg/L로 높게 나와 전체 유역 중 신천 유역에 대한 집중적인 수질관리가 필요한 것으로 나타났다. 전체 수질측정 자료의 상관분석 결과 COD는 TOC, BOD, TN 수질인자와 유의한 상관관계를 보여 유기물과 영양염류인자간의 상관성이 높은 것으로 나타났다. 주성분분석 결과 전체 측정소 자료는 81.221%로 2개의 주성분, 계절별 자료는 96.241%로 3개의 주성분이 추출되었다. 요인분석 결과 전체 측정소 자료와 계절별 자료의 수질영향 요인은 공통적으로 BOD, COD, TN, TP, TOC 항목이 나타났다. 시 공간적 군집분석 결과 계절별 특성 및 토지이용에 따라 각각 4개, 3개 그룹으로 나타났다. 본 연구는 임진강유역을 중심으로 8년간 시 공간적 특성을 고려한 수질 요인을 분석한 것으로 향후 유역환경변화에 따른 임진강 유역의 수질 변화를 이해하기 위한 기초 분석 자료가 될 것이다.

• 한국환경보건학회지
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• 제45권5호
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• pp.426-433
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• 2019

Objectives: Zooplankton communities play important roles in aquatic ecosystems as secondary producers that graze on phytoplankton and in turn are preyed upon by planktivorous and juvenile fish. They can shift their distribution, species composition, and abundance in response to environmental changes. Therefore zooplankton communities are important for understanding the energy flow in aquatic ecosystems and can be valuable indicators of environmental conditions. However, zooplankton in streams are still not well-studied, especially in northern Gyeonggi-do Province. This study aims to investigate the zooplankton communities in major streams in northern Gyeonggi-do Province. Methods: Zooplankton is important in the nutrient cycle and energy flow of aquatic ecosystems. Therefore, we surveyed zooplankton and measured temperature, DO, BOD, COD, T-N, T-P, and Chl-a in major streams (Sincheon, Gongneungcheon, Wangsukcheon, and Gapyeongcheon Streams) and stagnant water (Gomoji Reservoir). Results: The water quality in Gapyeongcheon Stream was the highest grade, while that of Gomoji Reservoir was mesoeutrophic and eutrophic during the research period. In the zooplankton community, Nauplius, Rotaria, and Monostyla spp. were dominant in Sincheon, Gongneungcheon, and Wangsukcheon Streams, and the dominance index was also high. In the case of Gapyeongcheon Stream, it was found that water quality and aquatic ecosystem health were good, and the lowest dominance index reflected this. In Gomoji Reservoir, Polyarthra spp., Nauplius, and Bosmina longirostris, which can be easily observed as eutrophication progresses, showed a high dominance rate. Therefore, it is necessary to monitor the progress of eutrophication in further research. Conclusions: We collected data on the zooplankton communities in streams and investigated their characteristics. As a result, specific species were found to be dominant at each survey sites and some of them are known to be observed as eutrophication progresses. Therefore, we should investigate the zooplankton community of streams around us and apply ecological stream management.

• Biomolecules & Therapeutics
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• 제13권1호
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• pp.41-47
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• 2005

The study was conducted to determine whether oak wood vinegar extract influences blood alcohol concentration and hangover syndrome in healthy volunteers. 2% wood vinegar extract was effective to inhibit increase of blood alcohol concentration after alcohol intake and showed significantly different (P<0.1) compared to placebo. By result of questionnaire of volunteers, wood vinegar extract showed effects improving hangover syndrome. In comparative study about blood alcohol concentration and hangover syndrome of wood vinegar extract and other extract that hangover improvement effect was reported, average maximum blood alcohol concentration was lowered in those taking wood vinegar extract than those taking other extract. At drinking completion 210minutes (T210), blood alcohol concentration of those taking wood vinegar extract was the lowest by 0.063% compared with other extract but was not significantly different between in those taking wood vinegar extract and in those taking other extract. However, wood vinegar extract's experimental group was the highest by 0.462 in decrement rate of blood alcohol concentration and, when did P<0.1 by significance level, indicated difference that mean statistically compared to placebo group uniquely. At those taking wood vinegar extract, the improvement rate and the aggravation rate of hangover syndrome was each 87%, 2%. Thus it was concluded that wood vinegar extract showed excellent alcohol oxidation and was effective in hangover improvement.

• 한국지역지리학회지
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• 제16권3호
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• pp.315-323
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• 2010

본 연구는 도심 생태관광자원인 대구시 신천을 방문한 방문객을 대상으로, 방문객 만족의 영향요인인 신천의 생태, 안내표지판, 그리고 물리적 시설과 만족, 그리고 만족과 행동의도간의 관계를 실증적으로 조사하였다. 연구결과 각 독립 변수인 신천의 생태에 대한 만족, 안내표지판, 그리고 물리적 시설 모두 전반적 만족에 유의한 영향을 미치는 것으로 나타났으며, 특히 물리적 요인이 가장 큰 영향을 미치는 것으로 밝혀졌다. 또한 전반적 만족도 재방문 의도에 긍정적으로 유의한 영향을 미치는 것으로 밝혀졌다. 추후 연구에서는 신천 방문객 만족에 영향요인을 끼치는 다양한 요인 조사를 바탕으로 한 연구, 하천 방문객 만족의 중요도와 성과도(IPA) 등을 통한 만족도 연구, 그리고 방문객 만족에 대한 계절 별 조사 등 종단적 연구도 필요하다고 하겠다.

• Bulletin of the Korean Chemical Society
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• 제34권9호
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• pp.2577-2582
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• 2013

A novel stick-shaped portable sensing device featuring a microhole array interface between the polyvinylchloride-2-nitrophenyloctylether (PVC-NPOE) gel and water phase was developed for in-situ sensing of perchlorate ions in real water samples. Perchlorate sensitive sensing responses were obtained based on measuring the current changes with respect to the assisted transfer reaction of perchlorate ions by a perchlorate selective ligand namely, bis(dibenzoylmethanato)Ni(II) (Ni(DBM)2) across the polarized microhole array interface. Cyclic voltammetry was used to characterize the assisted transfer reaction of perchlorate ions by the $Ni(DBM)_2$ ligand when using the portable sensing device. The current response for the transfer of perchlorate anions by $Ni(DBM)_2$ across the micro-water/gel interface linearly increased as a function of the perchlorate ion concentration. The technique of differential pulse stripping voltammetry was also utilized to improve the sensitivity of the perchlorate anion detection down to 10 ppb. This was acquired by preconcentrating perchlorate anions in the gel layer by means of holding the ion transfer potential at 0 mV (vs. Ag/AgCl) for 30 s followed by stripping the complexed perchlorate ion with the ligand. The effect of various potential interfering anions on the perchlorate sensor was also investigated and showed an excellent selectivity over $Br^-$, $NO_2{^-}$, $NO_3{^-}$, $CO{_3}^{2^-}$, $CH_3COO^-$ and $SO{_4}^{2^-}$ ions. As a final demonstration, some regional water samples from the Sincheon river in Daegu city were analyzed and the data was verified with that of ion chromatography (IC) analysis from one of the Korean-certified water quality evaluation centers.

• 대한지리학회지
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• 제36권3호
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• pp.217-232
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• 2001

우리나라 지형학연구의 가장 중요한 쟁점 중 하나는 산록에 분포하는 사면경사가 완만한 지형면 형성과정 에 대한 논의이다. 경주 남쪽에서 울산에 이르는 불국사단층선을 따라 분포하는 전체 선상계피 지형면을 분류하여 선상지의 공간분포 특징을 밝히고 선상지 형성과정을 검토하였다. 불국사산맥의 서사면에 분포하는 선상지는 불국사 단층선곡을 따라 남-북 방향으로 연속되어 합류선상지를 이루고 있다. 울산만에 인접한 신천-효문지역의 선상지분포 는第四紀 해면변동의 영향을 받았다. 연구지역에 발달된 선상지형성에 기여했을 다양한 요소들 중 중요한 네 가지 는 동결과 융해 가 반복되는 기각이 길어지는 빙기의 기후환경, 동해 쪽에서 내륙 쪽으로 향하는 횡압력에 의해 형성 된 불국사산지 서사면의 급한 사면경사, 이 구조운동에 의해 형성된 불국사단층선곡에 발달된 복수의 지질구조선, 그 리고 침식에 대한 저항력이 약한 불국사화강암과 중생대 퇴적암의 이루어진 이 지역의 기반암의 등으로 정리된다.

• 한국환경과학회지
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• 제10권3호
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• pp.225-231
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• 2001

The fish species collected in the Keumho River basin are 42 species 31 genera belonging to 15 Families. This report was investigated for the evaluation of water quality in the Keumho River system which is a tributary of Nakdong River in Korea on september in 1999. The fishes collected were 42 species, 31 genera belonging to 15 Families. The dominant species were 5 species; Zacco platypus, Zacco temmincki, Squalidus chankaensis tsuchigae, Moroco oxycephalus, Squalidus gracilis majimae, and 8 species; Hemibarbus longirostris, Pseudogobio esocinus, Culter brevicauda, Cobitis rotundicaudata, Pseudobagrus fulvidraco, Pungitius sinensis kaibarae, Monopterus albus, Channa argus were rare species. The relationship among the GPI, EC and BOD by the organic pollutants were over 0.9. The group pollution index(GPI) was lowest at St. 1(0.85) and highest at St. 1(0.85) and highest at St. 5(2.33). The water quality of the Keumho river divided into 3 parts; the water of upper reaches in river(St. 1) was 1st class(oligotrophic condition), middle parts(St. 2, 3, 4) were 3rd class($\alpha$-mesosaprobic condition) and lower part(St. 5) was 4th class(Polysaprobic condition) as the source of tap water, respectively. And the tributary which are the Sinryeong Stream(St. 6), the Sincheon(St. 7) and the Donghwa Stream(St. 9) in Keumho river were 2nd class as the source of tap water. The results in this study was represented same patterns as the result by the use of indicator species like as algae and invertebrates for the discrimination of water quality. So, some freshwater fish species can be use applicant for the discrimination of water quality.

• 한국환경과학회지
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• 제18권9호
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• pp.961-970
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• 2009

This paper has attempted to improve the quality of urban environment in terms of the management of urban green tract and suggest a way of coexistence between human and nature by proposing a plan to establish green network using an urban green zone based on 'linear concept' instead of point and plane concepts. The results have turned out as follows: 1. According to current status of forest functions, forest recreation area has reached 39.6%, satisfying citizens' needs. However, the space for living environment is just about 20% with a lack of a green zone. Therefore, it's been necessary to establish green network using roadside trees and take advantage of them as sustainable living space along with existing green tract. 2. With forest in the suburbs and Geumhogang which is the tributary to the Nakdonggang, Sincheon (stream) flows through the downtown. It connects mountains including Waryongsan from the south to the north around Duryu Park and Dalseong Park. Therefore, the water system that passes through Palgongsan (Mt.) and Biseulsan (Mt.) would make it possible to connect with the parks in the downtown. 3. According to this paper, it appears that it's necessary to establish green network through roof or wall greening by focusing on the existing green tract in the urban parks and suburbs and taking advantage of roadside trees and water system.

• 생태와환경
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• 제38권3호통권113호
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• pp.289-296
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• 2005

2003년 6월부터 2004년 5월까지 비슬산 일대의 계류의 20개 조사지점에서 담수어류상과 군집구조를 조사하였다. 조사기간 동안 9과 25속 29종의 어류가 채집 확인되었다. 잉어과 어류가 14종 (48.3%), 미꾸리과 어류는 4종 (13.8%) 이었으며, 한국고유종은 참몰개, 긴몰개, 치리, 기름종개, 미유기, 자가사리, 동사리의 6종 (22.2%)이었고, 외래도입종으로 베스와 블루길이 조사되었다. 기세곡천과 신천에서는 버들치가 우점종이고, 금포천은 참붕어, 현풍천은 피라미, 차천은 끄리가 우점종이었다. 낙동강본류의 영향을 받는 기세곡천, 금포천, 현풍천 그리고 차천의 하류역은 우리나라의 다른 수계에서 이입된 육식성 어종인 끄리의 밀도가 높게 나타나, 어류군집이 교란된 것으로 판단된다. 비슬산 일대의 소하천의 다양도지수는 금포천, 차천, 현풍천이 각각 0.936, 0.954, 1.023으로 신천과 기세곡천의 0.553과 0.727보다 높게 나타나 상대적으로 안정된 군집구조를 이루고 있는 것으로 나타났다.

• 수산해양교육연구
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• 제28권3호
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• pp.780-789
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• 2016

This study was conducted to clarify a correlation among science-related attitude, overexcitability and parents' rearing attitude perceived by elementary school students. For this purpose, questionnaire surveys were carried out for 276 elementary school students consisted of 5th and 6th grades. The results were as follows. First, science-related attitude, overexcitability, and parents' rearing attitude perceived by elementary school students were meaningfully different on gender. boys'average was higher in science-related attitude than girls'. In the case of overexcitability, boys'average was higher in psychomotor and intellectual overexcitability than girls', while girls'average was higher in emotional and sensual overexcitability than boys'. According to the analysis for parents' rearing attitude perceived by elementary school students, girl students perceived that their parents more firmly controlled them as compared with boy students. Second, according to the results conducting t-test for types of parents' rearing attitude perceived by students, boy students' average was meaningfully higher in the types of love-autonomy than girl students'. There was no difference between the groups of love-autonomy type and hostility-autonomy type. Third, there showed a meaningful correlation between students' science-related attitude and parents' rearing attitude in order of love, hostility, autonomy, and control type. There showed a meaningful correlation between students' science-related attitude and intellectual, sensual, imaginational, psychomotor, and emotional overexcitability in order. Last, according to multiple regression analysis, factors effecting on science-related attitudes were intellectual overexcitability, love among the types of parents' rearing attitude perceived by students im order.