• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2017년도 춘계학술대회 논문집
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• pp.80-80
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• 2017

Titanium and its alloys that have a good biocompatibility, corrosion resistance, and mechanical properties such as hardness and wear resistance are widely used in dental and orthopedic implant applications. However, they do not form a chemical bond with bone tissue. Plasma electrolytic oxidation (PEO) that combines the high voltage spark and electro-chemical oxidation is a novel method to form ceramic coatings on light metals such as tita-nium and its alloys. This is an excellent re-producibility and economical, because the size and shape control of the nano-structure is relatively easy. Silicon (Si), manganese (Mn), and magne-sium (Mg) have a useful to bone. Particularly, Si has been found to be essential for normal bone, cartilage growth, and development. Mn influences regulation of bone remodeling be-cause its low content in body is connected with the rise of the concentration of calcium, phosphates and phosphatase out of cells. Pre-studies have shown that Mg plays very im-portant roles in essential for normal growth and metabolism of skeletal tissue in verte-brates and can be detected as minor constitu-ents in teeth and bone. In this study, Electrochemical behavior of plasma electrolytic oxidized films formed in solution containing Mn, Mg and Si ions were researched using various experimental in-struments. A series of Si-Mn-Mg coatings are produced on Ti dental implant using PEO, with the substitution degree, respectively, at 5 and 10%. The potentiodynamic polarization and AC impedance tests for corrosion behav-iors were carried out in 0.9% NaCl solution at similar body temperature using a potentiostat with a scan rate of 1.67mV/s and potential range from -1500mV to + 2000mV. Also, AC impedance was performed at frequencies anging from 10MHz to 100kHz for corrosion resistance.

• 한국습지학회지
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• 제21권3호
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• pp.199-206
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• 2019

계단식 묵논습지의 식생 특성을 이해하기 위하여, 계단식 묵논습지의 식물종 구성 및 종풍부도 양상을 대상으로 자연습지 및 인공습지와의 비교연구를 수행하였다. 달뿌리풀은 자연습지(10.8%)나 인공습지(10.8%)에 비해 계단식 묵논습지(23.9%)에서 상대적으로 자주 관찰된 반면, 갈대는 계단식 묵논습지(18.3%) 보다는 자연습지(43.1%)나 인공습지(35.4%)에서 보다 높은 비율로 출현하였다. 부들의 경우 계단식 묵논습지(19.7%)에서만 높은 비율로 출현한 반면, 애기부들의 경우 자연습지(21.5%)와 인공습지(32.3%)에서 상대적으로 높은 비율을 보였다. 그와 더불어, 나도겨풀, 미나리, 그리고 개발나물과 같은 몇몇 습지 의존성 식물들의 경우 오직 계단식 묵논습지에서만 관찰되었다. 특히, 계단식 묵논습지($6.3{\pm}2.2$ 종/$m^2$)는 자연습지($4.9{\pm}1.8$ 종/$m^2$) 및 인공습지($3.9{\pm}1.3$ 종/$m^2$)에 비해 상대적으로 높은 수준의 식물 종풍부도를 나타내었다. 즉, 계단식 묵논습지는 특유의 식생 특성을 나타내었을 뿐만 아니라 종풍부도 차원에서 보다 높은 수준의 생태적 가치를 보인 것이다. 비오톱으로서 계단식 묵논습지가 갖는 높은 생태적 가치에 대한 계속적인 관심과 더불어, 이를 유지관리하고 보전하기 위한 차원에서의 지속적인 노력이 필요할 것이다.

• 대한임상독성학회지
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• 제3권2호
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• pp.79-85
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• 2005

Purpose: With the recent boom in 'eating healthy', many adults are interested in dieting to prevent future diseases. However only well trained experts can distinguish between what are edible vegetables and herbs from their poisonous look-alikes. In cases where a patient unknowingly ingests a poisonous herb, is caught off guard by the poisonous side effects that occur because of their lack of knowledge of what they have ingested. This paper will focus on the need to educate the public about the risks involved with ingesting wild vegetables and herbs and study the emergency diagnosis and treatment of poisoned patients that enter the emergency room. Method: This study was done in the spring of 2004 (from March to May) in the Kangwon Young-Seo districts of Korea. 15 subjects used in this study, entered the emergency room showing signs of toxic symptoms. Data was collected by examining subject's records. Additional data was collected by collaborating with physicians in the hospital that diagnosed and treated the subjects. Identifying the poisonous vegetable or herb is the first step to proper diagnosis and treatment. Subjects admitted to the emergency room, underwent a battery of tests: laboratory examination, ECG, radiological exam and etc. Results: The demographics of the study encompassed subjects with the average age of $50{\pm}19$ years old. There were 10 men and 5 women. Common symptoms of this study included; gastrointestinal symptoms such as nausea, vomiting, epigastric pain and so on. In the case of Caltha palustris ingestion, additional symptoms were present; bradycardia and hypotension which lasted for a long time. While cases that ingested Scopolia parviflora had little effect on vital signs but manic episodes lasted for about three days. Veratrum patulum ingestion showed signs of bradycardia and hypotension but contrary to Caltha palustris recovery was shorten by treating with dopamine. However, dizziness, headache and paresthesia of the extremities continued for a long time. Finally Sium ninsi ingestion showed visual disturbance, paresthesia of the extremities, dizziness as their initial symptoms. Conclusion: The risks involved with ingesting wild plants without the proper knowledge can lead to serious side effects and steps need to be taken to educate the public. In addition, all emergency physicians need to have a working knowledge of the symptoms and signs associated with ingesting toxic wild plants and need to treat accordingly.