• Journal of the Korean Arthroscopy Society
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• v.3 no.1
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• pp.44-47
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• 1999

The authors describe one case of a 25-year-old male with nodular tenosynovitis in left knee joint who did not have a history of joint trauma. He had joint pain and restricted flexion of the left knee at 100 degrees. After arthroscopic excision of mass, symptom was relieved completely and the patient had gained full range of motion of the left knee. No recurrence of symptom and loss of motion of the left knee were noticed during follow up period for 12 months.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1997.05a
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• pp.30-38
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• 1997

고속도로변에 설치된 retention pond는 drainage system의 일부분으로 우기에 빗물의 양을 조절하고 고속도로 노면에서 운반되어 retention pond에 유입된 오염된 입자를 침전, 제거시키기 위해 설치되었다. 빗물에 입자상태로 이동된 납, 아연, 카드뮴를 제거하기 위해 설치된 retention pond의 효과를 평가하기 위해 수리지질학적 연구 및 부유퇴적물의 물리화학적 특징을 규명하기 위한 연구가 수행되었다. 부유퇴적물과 비교하기 위해 심하게 오염된 roadside soil과 오염되지 않은 background soil에 대해서도 연구가 수행되었다. 부유퇴적물의 중금속함량은 background Sologne soil에 비해 원소에 따라 2-8배 높다. 그러나, roadside soil의 중금속함량은 부유퇴적물에 비해 7-26배 높다. Sequential extraction methods를 이용하여 분석한 결과 심하게 오염된 roadside soil에 존재하는 납, 아연, 카드뮴은 대부분 쉽게 용해될 수 있는 상태 (Fraction FII, FIII)로 존재하며 반면에 규산염광물과 수반되는 금속함량의 비율은 매우 낮다. 부유퇴적물에서는 규산염광물과 수반되는 금속함량이 전체 금속함량의 1/3까지 크게 증가한다. Roadside soil 과 부유퇴적물사이의 중금속함량 차이가 매우 큰 것은 중금속의 대부분이 retention pond에 이르기 전에 고속도로변과 배수로 일부에 축적되어 모두 상실하기 때문이다.

• Journal of Korean society of Dental Hygiene
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• v.16 no.6
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• pp.1105-1114
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• 2016

Objectives: The purpose of this study was to examine the scaling experience and related factors of people diagnosed with rheumatoid arthritis. Methods: The subjects were 30,680 people diagnosed with rheumatoid arthritis from the 2014 community health survey who were $${\geq_-}19$$ years old. Data were analyzed by chi-square test and multiple logistic regression analysis. Results: Those having regular scaling included well educated people, drinkers, more than three times tooth brushing practice, and regular dental checkup. The respondents were in the higher quartile of income And the respondents who were in the higher quartile of income were less likely to have scaling experience (p<0.05). Conclusions: The scaling experience was closely related with the age, educational level, residential area, income, drinking, tooth brushing practice, and regular dental checkup. It is necessary to investigate the influencing factors of rheumatoid arthritis and periodontal diseases in the further studies.

• Journal of Korean Society of Water and Wastewater
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• v.27 no.6
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• pp.751-759
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• 2013

This study is carried out to get the basic design parameters for phospate removal facilites from wastewater by Tobermolite. The phosphate removal by the apatite formation on the surface was affected by several important factors, temperature, ions present in wastewater stream, contact time, recirculation rate, and etc. In case of the temperature, with the increase of temperature, the apatite formation was accelerated. When temperature increased from $15^{\circ}C$ to $35^{\circ}C$, removal efficiency of phosphate increased from 83 % to 93 %. An increase of calcium and fluoride ion content increase the apatite formation, however, bicarbonate and magnesium ion inhibited the crystallization of apatite. As expected, when the recirculation rate was increased from 1 Q to 3 Q, at EBCT (Empty Bed Contact Time) 60min enhanced removal efficiency was observed. The more the recirculation rate increased, the more the removal efficiency increased. According to the results of column experiment using an actual wastewater with low and high phosphate concentration (5 mg/L and 50 mg/L-P), the removal efficiency was 77 % at EBCT of 45 min, and 80 % at 60 min. It was suggested that optimum EBCT was 45 min.

• Applied Chemistry for Engineering
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• v.19 no.4
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• pp.366-369
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• 2008

To evaluate the performance of a bipolar packed bed cell (BPBC) filled with granular aluminium, the experiments were carried out in two groups as batch and continuous processes. In a batch process, removal efficiency of total phosphate (T-P) was 88% in case of electrolytic treatment of phosphate solution, T-P 10 mg/L at 6 V during 3 h by BPBC filled with granular aluminium. In a continuous process, residual T-P concentration was about 2 mg/L in case of electrolytic treatment of phosphate solution, 10 mg/L at 6 V, HRT 3 h by BPBC filled with granular aluminium. Break-through point was observed after running for 120 h at hydraulic retention time (HRT) of 3 h.

• Journal of the Korean Society of Marine Environment & Safety
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• v.14 no.2
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• pp.105-109
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• 2008

In our country, limiting nutrient is known as phosphorus in the most lakes. Therefore, the removal of phosphorus is a very important process in sewage treatment. However, many of the sewage treatment plants employ the conventional activated sludge process, known to remove $10{\sim}30%$ of phosphorus. Thus, additional phosphorous removal process will be needed. Oyster shells have been known to remove phosphorus in water. The removal efficiency of phosphorus was highest at smallest size of oyster shells and at the highest pH for batch test. The phosphorous removal rate with various calcium concentrations was increased by increasing calcium concentration. At the 20 mg/l of calcium, more than 90% of phosphorous was removed in two hours. The removal efficiency of phosphorous was increased greatly at 300% of recirculation rate. With 300% of recirculation rate, the removal efficiency reached 80% at pH 11. The negative effects of bicarbonate on crystallization were observed in oyster shells. The effects of bicarbonate on rate constant were also investigated by applying these results to experimental equation. The rate constant was decreased at the inverse logarithm bicarbonate concentration.

• 한국생물공학회:학술대회논문집
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• 2003.04a
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• pp.348-350
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• 2003

Using acclimated sludges with inorganic nitrogen medium for three months and raw sludges, we investigated characteristics of biological nitrogen removal. As results, the acclimated sludges accomplished nitrification efficiently. But raw sludges have hardly done ammonium-nitrification and there was a increasing of ammonium concentration in flask with raw sludges for established experimental period of 72 hrs.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2014.11a
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• pp.204-206
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• 2014

석탄 화력발전소에는 연소가스의 질소산화물(NOx) 저감을 위한 SCR(selective catalytic reduction)설비가 운전되고 있으며, SCR은 환원제인 암모니아($NH_3$)를 이용하여 연소가스 내에 질소산화물을 물과 질소로 분해하는 역할을 한다. 그러나, 연소가스 중의 일부 삼산화황($SO_3$)과 미반응 암모니아가 결합하여 황산암모늄염(Ammonium bisulfate; $NH_4HSO_4$)을 생성하며, 이는 후단 APH(air preheater)의 열소자에 점착된 후 분진들과 함께 성장하여 막힘을 야기한다. 막힘이 발생된 APH는 연소가스의 흐름을 방해하기 때문에 차압을 증가시키며, 이는 발전효율의 감소뿐만 아니라 급전정지를 초래한다. 이를 해결하기 위하여 $CO_2$ 드라이아이스 세정 방법을 적용하였으며, pilot-scale plant에서 실험을 수행하였다. 또한, 드라이아이스 공정변수인 분사압력과 분사시간을 제어하여 pilot-scale plant의 APH 열소자 표면에 생성되어있는 오염물질들의 제거효율을 관찰한 결과 95 %의 높은 제거효율을 보였다.

• Proceedings of the KOR-BRONCHOESO Conference
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• 1987.05a
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• pp.17.2-17
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• 1987

식도이물은 이비인후과 영역에서 흔히 경험할 수 있는 것으로 연령, 성별, 민족 등에 제한없이 발생할 수 있으며, 대부분의 경우 예기치 않게 돌발적이며 부주의로 인하여 발생되는 경우가 많다. 이물은 일상생활과 밀접한 관계가 있는 것으로서 그 종류가 매우 다양하다. 대부분의 식도이물의 경우, 진단 및 치료가 용이하나, 경우에 따라서는 이물의 종류, 개재부위, 체류기간, 선행질병 및 증상 등에 따라 진단 및 치료가 용이하지 않은 경우도 있다. 특히 다발성 식도협착이 있는 환자의 원위(distal) 협착부위에 개재한 식도이물은 식도경이 근위(proximal)협착부를 통과할 수 없으므로 이물제거가 상당히 힘들 경우가 많다. 저자들은 최근 부식성 식도염에 속발한 다발성 식도협착이 있는 2명의 환자에서 원위협착부위에 개재한 식도이물을 fluoroscopy 도움하에서 Medi-Tech biliary basket을 사용하여 제거하였기에 문헌적 고찰과 함께 보고하는 바이다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.13 no.1
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• pp.7-11
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• 2002

A novel microstrip type law-pass filter using thin or thick film resistors is proposed to efficiently eliminate harmonic spurious response in stop-band. The proposed low-pass filter shows the spurious suppression enhancement of 20 dB over a conventional one. The designed low-pass filter could be used as a harmonic rejection filter of a local oscillator for Ku-band satellite payload system.