• 한국식품과학회지
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• 제30권2호
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• pp.456-460
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• 1998

음용수 중에 납과 카드뮴이 오염되었을 때 치커리, 당귀, 영지버섯의 중금속의 장내 흡수억제 효과가 있는지를 알아보기 위해 장내 흡수 조건을 고려한 투과막을 이용하여 in vitro실험을 실시하였다. 납과 카드뮴이 음용수 수질기준의 10배 또는 50배로 오염된 음용수에서 단독오염의 경우 납은 치커리, 당귀, 영지버섯에서 $40{\sim}60%$의 제거효과를 보였고 카드뮴의 경우는 치커리, 당귀, 영지버섯에서 $20{\sim}40%$의 제거효과를 나타내었다. 납과 카드뮴이 혼합오염된 경우에 납은 치커리, 당귀, 영지버섯의 세 시료에서 비슷하게 $30{\sim}50%$의 제거효과를 나타냈으며 카드뮴은 $10{\sim}30%$의 제거효과를 보여주었는데 치커리, 영지버섯에 비해 당귀가 높은 제거효과를 보여주었다. 추출조건별로 비교해보면 $70^{\circ}C$, 2분 추출조건의 경우가 $95^{\circ}C$, 10분의 경우보다 더 제거효과가 높았음을 관찰할 수 있었다. 한편 여과지 및 투과막에도 상당량의 중금속이 흡착되어 제거된다는 사실을 알 수 있었는데 오염된 중금속의 농도가 높을수록, 음료 추출온도가 높을수록 더 많은 중금속이 흡착되었음을 관찰할 수 있었다. 이러한 결과는 투과막이 중금속에 흡착되기 쉬운 섬유질로 이루어져 있기 때문인 것으로 추측되며 치커리, 당귀, 영지는 음용수중에 오염된 중금속의 장내흡수 억제 효과가 있음을 알 수 있었다.

• Journal of international Conference on Electrical Machines and Systems
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• 제2권4호
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• pp.460-465
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• 2013

Electrical equipments of nuclear power plant are divided into class 1E and non-class 1E. Electrical equipment and systems that are essential to emergency reactor shutdown, containment isolation, reactor core cooling, and containment and reactor heat removal, are classified as class 1E. batteries of nuclear power plant are divided into four channels, which are physically and electrically separate and independent. The battery bank of class 1E DC power system of the nuclear power plant use lead-acid batteries in present. The lead acid battery, which has a high energy density, is the most popular form of energy storage. Kt factor of lead-acid battery is used to determine battery size and it is one of calculatiing coefficient for capacity. this paper analyzes Kt factor of lead-acid battery for the DC power system of nuclear power plant. In addition, correlation between Kt parameter and peukert's exponent of lead-acid battery for nuclear plant are discussed. The analytical results contribute to optimize of determining size Lead-acid battery bank.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 The 6th International Symposium of East Asian Resources Recycling Technology
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• pp.489-493
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• 2001

Big cities in Japan have serious problems due to the shortage of new reclaimed land for municipal wastes. If harmful heavy metals such as cadmium, lead, copper and etc. are contained in the municipal waste combustion residues, they are not able to fill up according to the environmental law in Japan. In this study, the removal of heavy metals in the fly ash (EP ash) was dealt with chloridizing vaporization method. EP ash as a non-hazardous materials is utilized as covering materials, road bed, and building materials.

• 대한기관식도과학회지
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• 제9권1호
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• pp.79-82
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• 2003

Unintentional foreign body ingestion is common in children, and coins are the most common foreign body ingested. Foreign body remaining in the esophagus may be associated with mucosal ulceration or esophageal obstruction and can potentially lead to significant morbidity and even death. Removal of esophageal foreign body is therefore generally recommended. Several methods are utilized including esophagoscopy in operating room, flexible endoscopy in out patient setting, fluoroscopic Foley catheter technique, and advancement using bougienage. We report two cases of esophageal foreign body(paduk stone) which were hard to be removed by usual esophagoscopic removal. Successful removal was accomplished with the aid of Fogarty catheter under the general anesthesia.

• Journal of Korean Neurosurgical Society
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• 제38권3호
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• pp.227-230
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• 2005

Hearing loss in the contralateral functioning ear is a rare and distressing complication after vetibular schwannoma removal. Various possible mechanisms have been proposed, however, the etiology of hearing loss is not clear. Fortunately, this is an extremely rare occurrence, sporadic case reports have appeared in the literatures. We report two cases of acute contralateral hearing loss after vestibular schwannoma removal and discuss the possible mechanisms of the phenomenon. Although permanent deafness may result, in our cases, the hearing loss was temporary, returning to near preoperative level within one month. The etiology of hearing loss in one case is thought to be cerebrospinal fluid leakage. However, in the other case, the cause of hearing loss is not clear. A better understanding of these events may lead to preventive measures to avoid contralateral hearing loss after vestibular schwannoma removal.

• 대한후두음성언어의학회지
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• 제33권1호
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• pp.37-41
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• 2022

Airway foreign body aspiration in children can lead to accidental death, due to the foreign body itself or the removal procedure. Depending on its location, removal of the foreign body can be challenging. Here, we present a case of successful removal of a foreign body from the left upper lobar bronchus via ventilating bronchoscopy with a rigid bronchoscope and Fogarty arterial embolectomy catheter. Tracheobronchial foreign bodies in locations that are difficult to reach with forceps, due to an acute angle or the small diameter of the pediatric bronchial tree, can be effectively removed with a Fogarty arterial embolectomy catheter.

• 분석과학
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• 제19권4호
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• pp.280-284
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• 2006

The objective of this study is to investigate the removal of heavy metal by using the coprecipitation of barium sulfate. Several parameters governing the efficiency of the coprecipitation method were evaluated by the pH of sample solution, amount of coprecipitant, and addition of sulfide for the removal of As(V), Cd(II), Cr(III), Cr(VI), Cu(II), Hg(II) and Pb(II) metal ions ($10{\mu}g/ml$ each). The coprecipitation was about 80% - 95% only for lead at low pH but under 10% for other ions. The amount of removal was about 95% - 100% for Cd, Hg, Pb, Cu in the all pH range by the addition of sulfide with barium sulfate but As(V) and Cr(III, VI) ions were not affected by the same conditions.

• 한국환경농학회지
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• 제15권3호
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• pp.306-315
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• 1996

납 내성균인 P. aeruginosa의 균체내 납 축적 특성, 축적형태 및 균체내에 축적된 납의 회수 방법을 조사한 결과는 다음과 같다. 납 농도가 100mg/l인 용액중에서 처리 48시간 후 납 내성균주의 납 처리율은 약 97% 이상이었다. 납이 축적된 균체를 전자현미경으로 관찰한 결과, 균체의 cell wall과 cell membrane에 많은 electron-dense granule들이 형성되어 있었으며, electron-dense granule들을 EDS로 분석한 결과, 이 granule들은 lead complex인 것으로 확인되었다. 공시균주의 균체내 축적된 납은 증류수에 의해서는 거의 탈착이 되지 않았으나 EDTA 처리에 의해서는 약 87% 이상 탈착되었다. 납이 축적된 균체를 $550^{\circ}C$에서 회화시켰을 때 건조균체량의 약 30%에 해당하는 작열잔류화합물들이 생성되었으며, 이 작열잔류화합물들을 EDS로 분석한 결과, 납이 약 86% 이상 함유되어 있는 비교적 순수한 납 화합물인 것으로 확인되었다.

• Journal of Chest Surgery
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• 제48권2호
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• pp.129-133
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• 2015

Severe and permanent tricuspid regurgitation induced by pacemaker leads is rarely reported in the literature. The mechanism of pacemaker-induced tricuspid regurgitation has been identified, but its management has not been well established. Furthermore, debate still exists regarding the proper surgical approach. We present the case of a patient with severe tricuspid regurgitation induced by a pacemaker lead, accompanied by triple valve disease. The patient underwent double valve replacement and tricuspid valve repair without removal of the pre-existing pacemaker lead. The operation was successful and the surgical procedure is discussed in detail.

• 한국환경보건학회지
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• 제20권4호
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• pp.36-44
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• 1994

A study was carried out in order to investigate the removal efficiencies and removal characteristics of heaw metals such as Pb, Cd, Cr, Cu in raw water by one of conventional water treatment processes. The coagulants used in this study were Alum and PAC. Three kinds of water samples were provided: kaolin water, kaolin water mixed with humic acid and raw water from Han River mixed with suspended matter deposited on raw water inlet pipe. Heaw metals were added to the water samples with their respective turbidity, and jar tests were performed. In the results from heaw metal removal studies, lead might be adsorbed or exchanged on the particle surface (SS) rather than react with organic matter added. Cadmium was affected on the dissolved organic matter. Chromium was affected by the both dissolved organic matter and SS concentration, and the restabilization and the enmeshment appeared at moderate (50~80 NTU) and high (100 NTU) turbidity as defined in this experimenL The removal efficiency of copper was relatively little affected by the dissolved organic matter but by SS concentration in comparison with other heavy metals. In these studies as to the raw water turbidities and concentration of heaw metals, it is proved out that the removal efficiency on heaw metals in both cases of PAC and Alum as coagulants was not significantly different.