• 지역연구
• /
• 제36권2호
• /
• pp.3-12
• /
• 2020

최근 국내에서는 대도시를 중심으로 광역화 현상 및 교외화 현상이 나타나고 있으며, 이에 주거지와 고용지의 공간적 불규칙성이 증가하여 공간 미스매치 정도가 심화되고 있다. 이에 따라 원거리 통근이 증가하고 있으며, 비수도권 광역대도시권에서는 역통근 현상이 발생하고 있다. 역통근 현상은 도시민들 중 특정 계층의 고용기회를 제한하며, 비수도권 광역대도시권의 역통근은 자가용 중심의 통근으로 환경오염, 교통혼잡 등 다양한 문제를 야기할 수 있다. 이에, 국내에서는 공간 미스매치 정도와 역통근 관련 연구들이 진행되어왔으나, 다수의 연구들은 수도권을 대상으로 진행되었고, 역통근 현상이 주로 발생되는 비수도권 광역대도시권을 대상으로 이루어진 연구는 미흡한 상황이다. 이에, 본 연구에서는 통근의 발생원인인 공간미스매치를 고려하여 비수도권 광역대도시권에서 나타나는 역통근 현상의 원인을 실증분석하는 것을 목적으로 한다.

• Natural Product Sciences
• /
• 제17권1호
• /
• pp.38-44
• /
• 2011

The quality inspections items such as loss on drying, total ash, and acid-insoluble ash contents in herbal medicines, have a correlation with external sources of pollution, but are not themselves hazardous factors. Z-scores for standard normal distribution were used to investigate herbal medicines requiring quality control, which exceeds the regulatory limits of quality inspection. In total, 7,773 samples were analyzed based on plant parts. For the loss on drying, the numbers of items of herbal medicines requiring quality control are like these; 15 items for above-ground parts and 5 items for underground parts. For the total ash, 21 items for above-ground parts and 4 items for underground parts. For the acid-insoluble ash, 8 items for above-ground parts and 1 item for underground parts.

• 한국환경보건학회지
• /
• 제32권4호
• /
• pp.262-267
• /
• 2006

DBPs and T&O(taste-and-odor) compounds in drinking water is one of main source to deteriorate water quality. So, these compounds can cause adverse health effects and result in many consumer complaints aesthetically. This experiments carried out to investigate the effect of boiling water on DBPs and T&O compounds in the tap water. THMs and TCM concentration were reduced by 91.3%, 88.9% after 5 min of boiling, respectively. It is certainly, resulted from volatilization of TCM. TCAA concentration decreased when the water was boiled, too. By contrast, the concentration of DCAA was increased with duration time from boiling-point. The reduction of TCAA from the boiled water can be attributed to chemical transformation like decarboxylation. T&O compounds such as geosmin and 2-MIB was effectively removed by boiling of water, resulting in the removal efficiency of 97.1%, 94.4% after 5 min of boiling, respectively.

• Natural Product Sciences
• /
• 제12권3호
• /
• pp.166-173
• /
• 2006

Silymarin is an antihepatotoxic substance isolated from the fruits of silybum mariamum. Possibly due to their antioxidant and membrane stabilizing properties, the compounds was shown to protect various organs and cells against a number of insults (Kvasnicka et al., 2003). Among the main silymarin components, [silybin($SB_A,\;SB_B$, isosilybin ($ISB_A,\;ISB_B$) silydianin (SD) and silychristin (SC)], silybin is the major pharmacologically active compound. Korean Pharmaceutical Codex (2nd ed.) describes silybin as the main substance of Cardus Marianus extract as supportive treatment of chronic inflammatory liver disorders. The aim of this work was to analyze silybin from various preparations containing cardus marianus extract, nicotinamide, and riboflavin (CNR). Nine commercial products were tested using reversed-phase HPLC-PDA assay. The limits of detection and quantification were $0.2\;{mu}g/ml$ and $1\;{mu}g/ml$, respectively. Calibration curve showed a good linearity ($r^2$=1.00000) in the range of $1{\sim}500\;{\mu}g/ml$ of silybin standard solutions.

• 생약학회지
• /
• 제32권3호통권126호
• /
• pp.200-211
• /
• 2001

This study was carried out to determine the 11 organochlorine, 7 organophosphorus residual pesticides in 251 crude drugs. These residual pesticides in herbal drugs were extracted with acetonitrile and the extracts were cleaned up via LC-florisil solid phase extraction column. The prepared samples were assayed for pesticide residues using GC-ECD, NPD with capillary column and identified by GC-MSD. Recoveries were $63.9{\sim}111.5%$ in the organochlorine pesticides and $69.8{\sim}92.4%$ in the organophosphorus pesticides, and detection limits were $0.001{\sim}0.65\;ppm$ in the organochlorine pesticides and $0.0009{\sim}0.0074\;ppm$ in the organophosphorus pesticides. Pesticide residues were detected in 9 cases.

• Corrosion Science and Technology
• /
• 제11권2호
• /
• pp.56-64
• /
• 2012

Factors affecting corrosion of stainless steels such as pH, oxidation and redox potential (ORP), soil resistivity, water content of soil, chloride ion concentration, bacteria activity, and corrosion potential have been investigated using soil analysis, bacterial analysis, surfacial analysis, and analysis of corrosion potentials of several stainless steels buried in 8 sites of Seoul metropolitan for one year. Corrosion potential was affected by occurrance of corrosion as well as bacteria activity but the behavior of corrosion potential with time is different depending on occurrance of corrosion and bacteria activity. The main factor affecting corrosion of stainless steels in soil is level of chloride ion concentration which is also a main factor affecting corrosion of stainless steels in chloride containing drinkable water. Furthermore, guideline of stainless steels in drinkable water is concluded to be applicable to that in soil by the results from surfacial analysis.

• 대한환경공학회지
• /
• 제38권1호
• /
• pp.8-13
• /
• 2016

본 연구에서는 물속에 존재하는 방사성 세슘($Cs^+$)의 정수처리 제거방법을 고찰하였다. 세슘은 물속에서 대부분 이온상태인 $Cs^+$로 존재하여 모래여과, 정수약품(PACl), 분말활성탄(PAC) 및 정수약품(PACl + PAC) 혼합주입에 의해 제거되지 않았으나 탁도가 증가함에 따라 세슘 제거율이 증가하는 것으로 나타났다. G-취수장 주변 고형물과 황토를 이용하여 탁도를 각각 74 NTU와 103 NTU로 조정했을 때 세슘의 제거율은 각각 약 56%, 51%이었으며 상징수를 GAC로 여과한 경우, 세슘의 약 80%가 제거되었다. 따라서 효과적인 세슘 제거를 위해서는 황토 등을 이용하여 원수 탁도를 80 NTU 이상 조정해야 하는 것으로 나타났다. GAC에 의한 세슘 제거의 경우, 약 60%가 제거됨을 알 수 있었으며 이것은 접촉에 따른 흡착에 의해 제거된 것으로 판단된다. 막에 의한 세슘 제거에 있어서 정밀여과막으로는 제거되지 않았으나 역삼투막에서는 75%가 제거되었다.

• 한국물환경학회지
• /
• 제25권1호
• /
• pp.1-6
• /
• 2009

• 농촌지도와개발
• /
• 제11권1호
• /
• pp.139-159
• /
• 2004

Since 1990s, the countrysides in Seoul Metropolitan Area have been exposed to the unprecedented forces like developing telecommunication technology, the boom of exurban housing, increasing concern about food quality. While these new forces are restructuring the social and spatial pattern of countryside, a legal regulation can be assumed as exerting an overarching moulding power. This paper shows how the legal regulation works in the restructuring rurality.

• 한국지하수토양환경학회지:지하수토양환경
• /
• 제16권2호
• /
• pp.1-5
• /
• 2011

We surveyed the citizens opinion about springs in Seoul for two years from 2008 to 2009. It was found that spring water was mostly used by citizens older than 50, and that 29.5% of citizens used purified tap water as drinking water, 27.2% of them used boiled tap water, 21.1% of them used spring water, and 12.1% of them used bottled water. Citizens who store spring water more than a day are 76.7%. Although many citizens (70.3%) knew that water quality had been tested, 40% of them didn't care about checking the certificate of water quality analysis. Once recognized that the spring water was unfit for drinking exceeded standard of drinking water, 85% of citizens would rather not use the spring water.