• Composites Research
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• 제33권3호
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• pp.140-146
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• 2020

본 논문은 차량에 사용되는 파티션 패널을 기존의 알루미늄 소재에서 Carbon Fiber Reinforced Plastics(CFRP)로 소재를 변경하여 경량화 가능성을 확인하는 것을 목적으로 한다. 복합재 제작에는 3가지 방법의 직조 방법(평직, 능직, 주자직)이 사용되었고, 복합재 시편을 제작하고 시험을 수행하여 물성을 도출하였다. 이를 통해 비틀림 조건에 대한 복합재 파티션 패널 해석 모델을 구성하고, Tsai-Hill 파손 기준에 따라 구조적 안정성과 시스템 강성을 평가하였다. 섬유 배향 각도와 적층 순서에 대한 설계변수를 통해, 진화론적 알고리즘을 수행하였고, 그 결과로 최적의 복합재 파티션 패널을 설계하였다. 또한, 강도 및 비강성에 대한 구조해석 결과를 기존의 알루미늄 파티션 패널과 복합재 파티션 패널를 비교하여, 경량화 가능성을 검증하였다.

• Tuberculosis and Respiratory Diseases
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• 제72권2호
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• pp.177-181
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• 2012

Activated charcoal is an inert substance and it is used in standard therapy in patients with acute intoxication. Charcoal has some side effects such as pulmonary aspiration, gastrointestinal complications, and electrolyte abnormalities. Although aspiration of charcoal is a rare complication, it can cause fatal sequelae. We report a 69-year old man who developed acute respiratory failure associated with charcoal aspiration after management of glyphosate poisoning. The patient was drowsy and suffered severe vomiting during transport to our hospital. On arrival, acute respiratory failure was observed due to charcoal aspiration, but the clinical state was improved with repeated bronchoscopy with a bronchoalveolar lavage (BAL). We presumed that the aspirated charcoal was an important factor in evoking a lung injury. Early bronchoscopy with a BAL might be an effective method for eliminating charcoal from the lung, especially in the case of a large amount of aspiration, and be helpful in decreasing respiratory failure due to charcoal aspiration.

• 대한방사선기술학회지:방사선기술과학
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• 제41권6호
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• pp.617-626
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• 2018

This study aims to provide the basic data helpful for the improvement of rights and interests of radiological technologists, by understanding the current working environment and if they get the proper reward through the analysis on the perception of appropriateness of current wage and job satisfaction of radiological technologists. Survey was conducted to evaluate the perception of satisfaction with job and wage system, work intensity, necessity of the radiological technologist limit system, and turnover in accordance. The appropriate starting salary was low in case of women and non-capital area, and when the age, academic background, career, and hospital size were lower. The appropriate wage was low in case of women and non-capital area, and when the academic background and hospital size were lower. The negative perception of the necessity to change the wage system was shown in university hospitals. Regarding the work intensity, in case of women and low career, and when the age, academic background, and hospital size were higher, the work intensity was perceived as high. When the academic degree and hospital size were lower, the positive perception of the radiological technologist limit was shown. The turnover intention was high in case of women, and when the age, academic background, career, and hospital size were lower. In order to increase the job satisfaction of radiological technologists, it would be necessary to the appropriate reward and the environment where they could concentrate on work.

• 생약학회지
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• 제45권4호
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• pp.275-281
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• 2014

After harvesting the medicinal parts of Curcuma longa, the remaining underground parts were discarded. From the remaining underground parts of Curcuma longa quercetin-3-O-${\beta}$-D-glucopyranoside-7-O-${\alpha}$-L-rhamnopyranoside (Q37) was isolated. The antioxidant activities in vitro and lifespan-extension effect of Q37 were elucidated using the Caenorhabditis elegans. The 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging effect of Q37 showed similar potent activities in comparison with vitamin C. Q37 also showed potent superoxide quenching activities as measured by the riboflavin- and xanthine-originated superoxide quenching activity tests. Q37 prolonged lifespan of worms under normal culture condition. In terms of protective effect of Q37 on the stress conditions such as thermal and oxidative stresses, Q37-treated worms exhibited enhanced survival rate, as compared to control worms. To know the possible mechanism of Q37-mediated increased lifespan and stress resistance of worms, we examined the activities of Q37on superoxide dismutase (SOD), and invested intracellular reactive oxygen species (ROS) levels. The results revealed that Q37 was able to elevate SOD activity of worms and reduce intracellular ROS accumulation in a dose-dependent manner.

• 한국수산과학회지
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• 제47권5호
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• pp.489-494
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• 2014

This study determined the effect of packaging and electron beam irradiation on the quality of dried Undaria pinnatifida. Samples were air or vacuum packaged and irradiated at 7 kGy. The dried Undaria pinnatifida had total viable cells and coliform counts of 5.51 and 4.40 log CFU/g in total, respectively, and counts of 5.56 and 4.19 log CFU/g in surface. These counts were reduced by 2-4 log cycles after irradiation. Irradiation increased the lightness and yellowness of the dried Undaria pinnatifida, but not the redness. In the sensory evaluation, there were no significant differences among samples. Therefore, electron beam irradiation improves the microbial safety and quality of dried Undaria pinnatifida.

• 한국전산구조공학회논문집
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• 제23권2호
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• pp.191-198
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• 2010

이 연구에서는 접착패치보강의 서로 다른 형태 즉, 패치와 접착제의 재료, 크기, 두께 뿐만 아니라 일면보강 또는 양면보강에 따른 일변균열판의 응력감소에 대한 연구가 수행되었다. 수치해석 도구로는 p-수렴 부분층별 모델이 사용되었다. 이 모델의 면내 변위는 구간별 연속인 선형변화로 가정하였고, 두께방향으로의 면외 변위는 일정한 상수로 가정하여 적용하였다. 변위장의 정의는 적분형 르장드르 다항식을 적용하였고, 수치적분은 별도의 외삽법 없이 각 층별의 절점에서 발생하는 적분값을 바로 얻을 수 있는 가우스-로바토 적분법을 사용 하였다. 또, 에너지 방출률법을 사용하여 응력확대계수를 산출하였다. 수치예제를 통해 제안된 모델의 정확도는 물론이고 접착패치 보강형태에 따라 변화되는 무차원 응력확대계수와 처짐의 항으로 응력감소 효과를 분석하였다.

• Journal of Gastric Cancer
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• 제16권3호
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• pp.131-140
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• 2016

Purpose: The Korean Gastric Cancer Association (KGCA) has conducted nationwide surveys every 5 years, targeting patients who received surgical treatment for gastric cancer. We report the results of the 2014 nationwide survey and compare them to those of the 1995, 1999, 2004, and 2009 surveys. Materials and Methods: From March 2015 to January 2016, a standardized case report form was sent to every member of the KGCA via e-mail. The survey consisted of 29 questions, regarding patient demographics as well as tumor-, and surgery-related factors. The completed data forms were analyzed by the KGCA information committee. Results: Data on 15,613 patients were collected from 69 institutions. The mean age was $60.9{\pm}12.1$ years, and the proportion of patients more than 70 years of age increased from 9.1% in 1995 to 25.3% in 2014. Proximal cancer incidence steadily increased from 11.2% in 1995 to 16.0% in 2014. Early gastric cancer incidence consistently increased and accounted for 61.0% of all cases in 2014. The surgical approach was diversified in 2014, and 7,818 cases (50.1%) were treated with a minimally invasive approach. The most common anastomosis was Billroth I (50.2%) after distal gastrectomy, and the proportion of Roux-en-Y anastomoses performed increased to 8.6%. Conclusions: The results of this survey are expected to be important data for future studies and to be useful for generating a national cancer control program.

• Journal of Korean Dental Science
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• 제3권1호
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• pp.39-42
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• 2010

This case report presents a case that underwent three-piece segmental maxillary osteotomy and sagittal split ramus osteotomy on a patient with severe facial asymmetry accompanied by maxillary prognathism, severe left scissor bite, and chin point deviation. The resulting facial appearance and occlusion were improved, thereby three-piece segmental maxillary osteotomy is regarded effective methed in treating severe facial asymmetry.

• 한국주조공학회지
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• 제35권5호
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• pp.114-119
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• 2015

This paper reports the effect of a refractory crucible type on the microstructure of duplex stainless steel (DSS) cast with the addition of gadolinium using air-induction melting. Grade 4A DSSs with 1 wt% of gadolinium (Gd) were fabricated in various crucibles including alumina ($Al_2O_3$), magnesia (MgO), calcia (CaO) coated with yttria ($Y_2O_3$) and graphite. The standard free energies of the formation of calcium and yttrium oxide were lower than those of gadolinium oxide and other crucible elements based oxide. The yield of Gd in DSS using $Al_2O_3$, MgO, CaO-coated $Y_2O_3$ and graphite was 5, 19, 83 and 96%, respectively. As Gd yield increased, the amount of Gd-based inclusions increased, the size of the inclusions were reduced, and the inclusions became evenly distributed.

• 한국세라믹학회지
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• 제53권1호
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• pp.13-17
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• 2016

It is highlighted that increasing the adsorbent surface area on volumetric basis is very important in providing an easy access for gas molecules. Fine particles around $3{\mu}m$ of soft-burned dolomite kiln dust (SB-DKD) were hydrated to wet slurry samples by ball mill process and then placed in a chamber to use spray dryer method. Spherical granules with particle size distribution of $50{\sim}60{\mu}m$ were prepared under the experimental condition with or without addition of a pore-forming agent. The relationship between bead size of the pore-forming agent and size of SB-DKD particles is the most significant factor in preparation of spherical granules with a high porosity. Whereas addition of smaller beads than SB-DKD resulted in almost no change in the surface porosity of spherical granules, addition of larger beads than SB-DKD contributed to obtaining of the particles with both 15 times larger average pore volume and 1 order of magnitude larger porosity. It is considered that spherical granules with improved $N_2$ gas adsorption ability may also be utilized for other atmospheric gas adsorption.