• 한국가스학회지
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• 제21권5호
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• pp.45-55
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• 2017

대부분의 가연성가스의 누출 및 화재/폭발 등의 실험은 큰 위험성이 있으며 실험을 진행할 수 있는 부지 선정에 큰 어려움이 있어 가급적 전산유동해석(CFD) 등의 간접적 방법을 많이 활용하였다. 그러나 2016년 10일 강원도 영월군에 에너지안전실증연구센터가 개소함에 따라 대규모/고압/초저온 등의 실험 뿐아니라 소규모 가연성 가스의 누출 및 검지 실험이 가능하게 되어 본 실험을 계획하였다. 본 실험에서는 가스센서를 교정하고 가스가 누출될 공간에 배치 후 LP가스를 누출시켜 가스센서에 검지된 값을 Contour map으로 가시화하였다. 또한 동일 조건으로 해석한 전산유동해석 결과값과 비교하여 LEL 25% 값의 실제 누출(28s, 최대 3.7m)의 차이점에 대해 분석하였다.

• Journal of Advanced Marine Engineering and Technology
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• 제32권3호
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• pp.430-436
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• 2008

Recently, there are many cases to use a ship's engine performance analyzer(SEPA) to measure pressure in cylinder and top dead center(TDC) of piston of engine, and analyze its performance such as fuel injection time and horsepower as well as wear of piston ring. But, SEPA needs TDC pulses($T(1){\sim}T(n)$) generated when pistons of engine are located to the TDC position ($TDC(1){\sim}TDC(n)$), these pulses are gathered from sensors connected to gear wheel of the propeller shaft in the remote distance from the measurement point. Therefore, operators need a long wire cable(WRC) to TDC detecting sensor to get these pulses, but this method is a very uncomfortable and expensive in case of installation, and it might decrease user's purchase desire. In this paper, we design and fabricate a small and inexpensive MODEM cable(M0C) so that it may be available to transmit TDC pulse generated from sensor in propeller shaft through existing power line. We also verify the facts that this MOC can be applied to SEPA and the effectiveness of the system through the experiments.

• Mass Spectrometry Letters
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• 제6권4호
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• pp.112-115
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• 2015

In this article, we examine the influences of Ne and He buffer gases under confined Ar⁺ ion cloud in a homemade Paul ion trap in various pressures and confinement times. The trap is of small size (r₀ = 1 cm) operating in a radio frequency (rf) voltage only mode, and has limited accuracy of 13 V. The electron impact and ionization process take place inside the trap and a Faraday cup has been used for the detection. Although the experimental results show that the Ar⁺ ion FWHM with Ne buffer gas is wider than the He buffer gas at the same pressure (1×10^-1 mbar) and confinement time is about 1000 μs, nevertheless, a faster cooling was found with He buffer gas with 500 μs. ultimetly, the obtanied results performed an average cloud tempertures reduced from 1777 K to 448.3 K for Ne (1000 μs) and from 1787.9 K to 469.4 K for He (500 μs)

• Asian Pacific Journal of Cancer Prevention
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• 제15권12호
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• pp.4939-4944
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• 2014

The purpose of this study was through a survey of awareness of cancer and cancer screening of Korean community residents to identify the stereotypes of cancer and bases for development of improved screening programs for early detection. Subjects were residing in South Korea Gangwon-Province and were over 30 years and under 69 years old. The total was 2,700 persons which underwent structured telephone survey questionnaires considered with specific rates of gender, region, and age. For statistical analysis, PASW Statistics 17.0 WIN was utilized. Frequency analysis, the Chi-square (${\chi}^2$) test for univariate analysis, and logistic regression analysis were performed. The awareness of cancer and cancer screening in subjects differed by gender, region and age. For the idea of cancer, women thought about death less than men (OR: 0.73, p<0.001). On the other hand, women had negative thoughts - fear/terror/suffering/pain/pain - more than their male counterparts (OR: 2.04, p<0.001). Next, for the idea of cancer screening, women recognized fear/terror more than men (OR: 1.38, p<0.01). The higher age, the more tension/anxiety/worry/burden/irritated/pressure (OR: 1.43, p<0.01, OR: 2.15, p<0.001, OR: 2.49, p<0.001)). People may be reminded of fear and death for cancer and of fear, terror, tension and anxiety for cancer screening. To change vague fear and negative attitudes of cancer could increase the rate of cancer screening as well as help to improve the quality of life for community cancer survivors and facilitate return to normal social life. Therefore, it is necessary to provide promotion and education to improve the awareness of cancer and cancer screening.

• 한국생활과학회지
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• 제17권1호
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• pp.159-170
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• 2008

This study was carried out for the prevalence of metabolic syndrome in obese middle school students. The subjects were 104 obese adolescents of 4 middle schools in Namwon city, Jeonbuk. Average age of the subjects was 12.2 years old, BMI of mild obesity group, moderate obesity group and severe obesity group were 24.6kg/m2, 27.5kg/m2, and 31.8 kg/m2, respectively. Prevalence of metabolic syndrome in obese students was 2.9%. And the person who has more than 2 out of 5 symptoms was 22.1%, and more than 1 was 39.4%. The prevalence of each symptoms were abdomen obesity(46.2%), hyper triglyceride(23.1%), high blood pressure(20.2%), high HDLcholesterol(2.9%), but the hyper glycemia had not been found. Nutrient intakes of 3 groups were not significantly different, energy was 1817.9kcal, carbohydrate was 265.7g, protein was 72.2g, and fat was 51.9g. Nutrient adequacy ratio(NAR) of protein, phosphorus, iron, vitamin A, vitamin B1, vitamin B1, niacin, vitamin C was proper, except calcium. Seventy point two percent of the obese students knew 'obesity is a disease', and 49.0% of the subjects didn't know the complication of the obesity. Only 27.9% of the obese adolescents took nutrition education class, but 51.9% of them thought nutrition education was necessary. We suggest that the nation enforce the policy for early detection and treatment of obesity for adolescents. Obese students and their parents should take nutrition education.

• 한국항행학회논문지
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• 제21권1호
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• pp.126-131
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• 2017

본 논문은 오래된 옹벽과 같은 건축물이나 잠재적 위험을 내재한 건설 및 토목 구조물 등에 부착 가능한 블루투스 비콘 센서 노드를 활용하여 위험감지 및 대피/대처 서비스를 제공해줄 수 있는 스마트 안전 계측 시스템을 설계한다. 제안한 시스템은 블루투스 비콘을 활용하여 비콘이 설치된 지점의 가속도, 자이로, 지자계, 압력/고도, 온도/습도 등의 다양한 센서 데이터를 전송할 수 있으며 이러한 데이터를 활용하여 위험 감지, 예측, 경고 등의 다양한 서비스에 활용할 수 있다. 제안한 시스템의 실효성을 검증하기 위해 필드 테스트를 수행하였으며 옹벽의 변위값이 허용변위 38.5 mm 내에 존재한다는 것을 확인하였다.

• Journal of Korean Neurosurgical Society
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• 제37권6호
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• pp.436-442
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• 2005

Objective: The detection rate of traumatic subdural hygroma(TSH) has increased after the development of computed tomography and magnetic resonance imaging. The treatment method and the mechanism of development of the TSH have been investigated, but they are still uncertain. This study is performed to evaluate the effectiveness of subduroperitoneal shunt in traumatic subdural hygroma. Methods: Five hundred thirty six patients were diagnosed as TSH from 1996 to 2002, among them, 55 patients were operated with subduroperitoneal shunt. We analyzed shunt effect on the basis of clinical indetails, including the patient's symptoms at the diagnosis, duration from diagnosis to operation, changes of GCS, hygroma types. We classified the TSH into five types (frontal, frontocoronal, coronal, parietal and cerebellar type) according to the location of the thickest portion of TSH. Results: The patients who have symptoms or signs related to frontal lobe compression (irritability, confusion) or increased intracranial pressure (headache, mental change), had symptomatic recovery rate above 80%. However, the patients who have focal neurological sign (hemiparesis, seizure and rigidity), showed recovery rate below 30%. The improvement rate was very low in the case of the slowly progressing TSH for over 6weeks. We experienced complications such as enlarged ventricle, chronic subdural hematoma, subdural empyema and acute SDH. Conclusion: Subduroperitoneal shunt appears to be effective in traumatic subdural hygroma when the patients who have symptoms or signs related to frontal lobe compression or increased ICP and progressing within 5weeks.

• 약학회지
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• 제54권4호
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• pp.295-299
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• 2010

The aim of this study was to develop and validate for determination of alibendol in human plasma by HPLC method. After precipitation of 500 ${\mu}l$ plasma samples by 50% methanol 50 ${\mu}l$ and 60% perchloric acid 30 ${\mu}l$ and the supernatant 50 ${\mu}l$ was injected into HPLC. The assay was performed isocratically using 10 mM potassium phosphate (pH 3.0) and acetonitrile (80 : 20, v/v) as mobile phase. The $C_{18}$ column (particle size $3.5{\mu}m$, $4.6{\times}50$ mm, Zorbax Eclipse) was used as a solid phase. The mobile phase was delivered at a flow-rate of 1.7 ml/min, detection was by ultraviolet absorption at 232 nm and concentrations were calculated on the basis of peak areas. In these conditions, alibendol can be separated from ethylparaben, the internal standard, and endogenous substances. The retention times of alibendol and ethylparaben were just about 2.6 and 3.5 minutes, respectively. This rapid HPLC method was validated by examining the precision and accuracy for inter- and intra-day analysis. The standard curve was linear ($R^2$=1.0000) over the concentration range of 0.05~20 ${\mu}g$/ml. The inter-day relative standard deviation (R.S.D.) and accuracy were 0.2~12.2% and 94.4~101.2% (82.7% at the lower limit of quatitation). The intra-day R.S.D. and accuracy were 0.1~11.8% and 98.8~102.5%, respectively. The method was successfully applied to the determination of alibendol in plasma for a pharmacokinetic study.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2005년도 공동학술대회 논문집
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• pp.71-76
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• 2005

이 논문에서는 수리시설물을 효율적으로 유지관리하기 위하여 저수지 및 방조제제체에 계측 시스템을 설치하고, 전기비저항, SP, 수위, 간극수압 및 지중변위를 주기적으로 모니터링하여 그 결과를 분석함으로써 제체의 누수현상 및 안정성 평가를 시도하였다. 저수지 및 방조제의 체제에 설치된 전기비저항/SP 측정 시스템으로부터 측정한 각 단계별 측정 자료의 변화영상을 구하고, 변화추이를 비교분석함으로써 누수현상을 정확하게 파악할 수 있었고, 수위, 간극수압 및 지중변위량의 자료를 종합적으로 해석함으로써 제체의 안정성을 평가할 수 있었다. 이러한 결과로부터 종래의 일시적으로 실시한 물리탐사 결과로부터 누수현상을 파악하는 것보다 모니터링 계측시스템을 설치하여 운용하는 것이 수리시설물을 효율적이고 경제적으로 유지관리하기 위한 방법임을 알았다.

• Journal of Magnetics
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• 제17권4호
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• pp.302-307
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• 2012

We have designed, fabricated and tested an integrated microfluidic chip with a Planar Hall Effect (PHE) sensor. The sensor was constructed by sequentially sputtering Ta/NiFe/Cu/NiFe/IrMn/Ta onto glass. The microfluidic channel was fabricated with poly(dimethylsiloxane) (PDMS) using soft lithography. Magnetic nanoparticles suspended in hexadecane were used as ferrofluid, of which the saturation magnetisation was 3.4 emu/cc. Droplets of ferrofluid were generated in a T-junction of a microfluidic channel after hydrophilic modification of the PDMS. The size and interval of the droplets were regulated by pressure on the ferrofluid channel inlet. The PHE sensor detected the flowing droplets of ferrofluid, as expected from simulation results. The shape of the signal was dependent on both the distance of the magnetic droplet from the sensor and the droplet length. The sensor was able to detect a magnetic moment of $2{\times}10^{-10}$ emu at a distance of 10 ${\mu}m$. This study provides an enhanced understanding of the magnetic parameters of ferrofluid in a microfluidic channel using a PHE sensor and will be used for a sample inlet module inside of integrated magnetic lab-on-a-chip systems for the analysis of biomolecules.