• Korean Journal of Environmental Biology
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• v.18 no.3
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• pp.355-365
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• 2000

In order to study the relationship between water quality and phytoplankton standing crops, the authors investigated the physicochemical factors, phytoplankton standing crops and chlorophyll-a at two stations in the Daechung Reservoir during the period from May to November 1998. Nutrients (nitrite, nitrate, ammonia and phosphate) have gradually increased more than those of the previous reports. Concentrations of the total nitrogen, phosphorus, chlorophyll -a and transparency exceeded the standard value of eutrophication. It could be assumed that the eutrophication of the Daechung reservoir was caused by various pollutants. Chlorophyll-a concentration was under the influence of phytoplankton standing crops, but very tiny cell-sized blue-green algae were less important in regards to the chlorophyll-a. Except at station 1 from July to August, phytoplankton standing crops bloomed during the time of the survey. Spring phytoplankton blooms caused by nitrate and phosphate in the surface layer. High concentrations of the suspended solids in July and August were caused by an inflow of them due to heavy rains. Density of heterotrophic bacteria was high in August owing to the high water temperatures and the organic nutrients which were from the nearby reservoir.

• Journal of Oral Medicine and Pain
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• v.38 no.3
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• pp.247-253
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• 2013

Renal osteodystrophy(RO) is characterized by skeletal changes in patients with renal disease and developed as a result of alterations in the metabolism of calcium, phosphate and secondary hyperparathyroidism. Bony changes in the craniofacial region include decreased bone density, radiolucent lesions(brown tumors), depletion of cortical bone and loss of lamina dura, but such changes rarely occur in the temporomandibular joint(TMJ). We report an uncommon case of bony changes and pain of both TMJs in a patient with RO. A 41-year-old man with RO came to our clinic due to TMJ pain and sounds. Occlusal change was also reported. Radiographs revealed degenerative changes of the both condyles. The patient had medical history of renal cancer therapy and hemodialysis. The patient was diagnosed with TMJ arthritis of RO and referred for systemic management through medication of calcium and vitamin D and parathyroidectomy. At 15-month follow-up, most of TMD symptoms disappeared and second radiographs revealed that bone density and cortical thickness of the mandible increased and the skeletal outline of the both condyles became relatively clear. As bony changes may begin in the early stage of the renal disease, dentists should be alert to detect the sign of the disease. In addition, it is important to differentiate TMJ arthritis of systemic cause because the treatment protocol is quite different.

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.76-76
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• 2017

• Journal of the Korea Convergence Society
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• v.10 no.8
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• pp.67-73
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• 2019

The purpose of this study was to investigate the correlation between obesity and periodontitis by the number of pregnancy using the Korean National Health and Nutrition Examination Survey(2010-2015). Periodontitis measures the community periodontal index, and body mass index was used for the obesity. Socioeconomic variables and health-related behaviors were investigated. Periodontitis and obesity were higher in women with a high pregnancy frequency after controlling for confounding variables. In conclusion, periodontitis is closely related to obesity, and the association is somewhat higher as the number of pregnancies increases. Comprehensive management of obesity and periodontitis is effective in developing health promotion program for women in future, and this data will be used as basic data for development of women's health promotion program.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.13 no.1
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• pp.15-26
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• 2008

The NEMURO model is aimed to efficiently understand the interaction among factors of lower trophic level of a marine ecosystem, using data on solar radiation and sea water temperature. In this study, we analyzed the seasonal pattern of nutrients and planktons, and estimated productivity and biomass of planktons from 2002 to 2005. Nutrients($NO_3$, $NH_4$, and $Si(OH)_4$) which were used by phytoplankton showed a high concentration before the bloom of phytoplankton. Nutrients (DON, PON, and Opal) which were a byproduct of phytoplankton showed a high concentration in the same period as the bloom of phytoplankton. Both phytoplankton and zooplankton had two peaks in March and August. Estimated phytoplankton biomass from the NEMURO model showed a similar pattern with observed chlorophyll a concentrations. Biomasses of phytoplankton were bigger than those of zooplankton. Annual mean biomasses of small and large phytoplankton were estimated at 30.961 and $14.070\;{\mu}g\;l^{-1}$ respectively. Annual mean biomass of predatory zooplankton was greater than those of small and large zooplankton.

• Proceedings of the Korea Contents Association Conference
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• 2013.05a
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• pp.25-26
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• 2013

염관리법 제정 이후 천일염산업이 활성화되고 있다. 최근 미네랄과 칼슘 등의 풍부한 영양성분이 함유된 국내산 천일염의 판매량이 급증하고 있다. 우수한 품질이 알려지며 외국 시장에도 수출이 이루어지고 있다. 국내 외 시장에서 명품 천일염으로 자리잡기 위해서는 품질이 우선이지만 패키지 디자인도 중요하다. 국내 수입 천일염 패키지의 다양한 색상보다 국내 천일염 패키지의 색상은 관용색을 주로 사용하고 있어 주목성이 떨어진다. 패키지디자인에서 색상은 중요한 요소 중 하나이다. 컬러 마케팅이 중요한 요즘 한 번 구입한 브랜드를 재구입할 수 있도록 소비자의 머리에 제품의 색상이 각인될 수 있는 컬러 선택이 중요하다. 이를 위해 수입 천일염 패키지디자인의 색상과 국내산 천일염 패키지디자인의 색상을 비교분석하여 국내 천일염 패키지디자인의 개선 방향을 모색하고 더 나은 부가가치를 창출하고자 한다.

• Journal of the Korean Society for Marine Environment & Energy
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• v.19 no.2
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• pp.87-98
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• 2016

During the period between July 3 and 27 of 2009, water samples were collected from the Russian coast at a depth of 30m from 26 stations (including Ulleung and Japan basins) onboard the Russian survey vessel R/V Lavrentyev following 4 lines (D, R, E, and A). The samples were analyzed for nutrients and chlorophyll a contents. All parameters exhibited higher values in warm waters than in cold waters ($NH_4:1.8-fold$, $PO_4:1.8-fold$, $SiO_2:1.2-fold$, and chlorophyll-${\alpha}$:1.9-fold), except nitrates, which was 1.4-fold higher in cold waters than in warm waters. The horizontal distribution of ammonia, phosphate, and chlorophyll-${\alpha}$ was very similar to each other and showed the highest values in the waters near Russia, where a upwelling influence of cold current and bottom water prevails, while relatively low distribution was observed at the Ulleung Basin. On the other hand, nitrates showed the highest concentration at the Ulleung Basin, which is under the direct influence of the Tsushima warm water, and showed a gradual decrease northward. The N/P ratio showed the highest value in the Tsushima middle water, rather than in the North Korean Cold Water, the Tsushima Warm Water was the primary source of nitrate flow into the East Sea. However, the average concentration of phosphate in the warm waters was < $0.2{\mu}M$, thereby limiting phytoplankton growth, while a high concentration of phosphate in cold waters showed a direct correlation with chlorophyll-${\alpha}$. The results of principal component analysis for the identification of primary factors that influence the marine environment showed that principal component I was water temperature and principal component II was influenced chlorophyll-${\alpha}$ and nutrients. Therefore, Study area has greatest influenced by water temperature, and clearly distinct cold and warm water regions were observed in the East Sea.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.208-209
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• 2001

이매패류는 해수 중의 유기물과 식물플랑크톤을 지속적으로 여과하여 소비하고(Carlson et al., 1984; Cohen et al., 1984; Frechette ＆ Bourget, 1985' Smaal et al., 1986; Hily, 1991), 생물 대사 활동에 의해 배설되는 입자 유기물 (biodeposit)은 퇴적물에 축적되어 (Verwey, 1952; Haven ＆ Morales-Alamo, 1972) 해수 중으로 다시 영양염을 공급하는 등 생태계 내의 영양염 및 에너지 순환에 많은 영향 (Boynton et al., 1980; Dame et al., 1980; Prince ＆ Smaal, 1990)을 미치고 있기 때문에, 생태계 구성요소들 중에서 매우 중요한 역할을 담당하고 있는 것으로 알려져 있다(Gosling, 1992; Dame, 1996). (중략)

• Journal of the Korean Society of Industry Convergence
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• v.5 no.4
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• pp.347-351
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• 2002

유입되는 담수의 영향을 크게 받는 한 하구 (미국 버지니아주의 요크강)의 크기별 식물성플랑크통의 역학에 대한 수리역학적 조절에 대한 조사를 위해 플랑크톤 생태계모델이 계발되었다. 모델은 요크강 하류의 상부층에서의 탄소 및 영양염의 분포를 나타내는 12개의 구성체 변수로 이루어져 있다. 빛, 온도, 바람, 해류 그리고 조수와 같이 이송과 혼합을 일으키는 물리적 변수들로 포함하고 있다. 모델은 포트란으로 계발되었고 Runge- Kutta technique을 이용해 미분방정식을 풀었다. 모델분석 결과, 크기가 큰 마이크로 식물성플랑크톤의 수화는 수체내의 생산보다는 이송이나 확산 때문에 나타나는 것임을 알 수 있었다.

• Proceedings of the Korean Aquaculture Society Conference
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• 2001.12a
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• pp.257-258
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• 2001