• 한국물환경학회지
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• 제20권6호
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• pp.664-669
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• 2004

An upflow BAF(Biological Aerated Filter) equipped with an expanded clay media was applied to reuse weaving wastewater of water jet loom. The performance of lab-scale biofilter was investigated by the adjustment of EBCTs(Empty Bed Contact Time) and the packing ratio of media, which were changed 1.1 to 3.7hr and 38 to 63%, respectively. In most conditions except 1.1hr of EBCT, BOD, CODcr, SS and Turbidity of the effluent were 1~4mg/L, 7~16mg/L, 1~5mg/L and 5~14NTU, where their removal efficiencies were 76~95%, 82~93%, 63~94% and 59~81%, respectively. From the observation of SEM(Scanning Electron Microscope) photographs of porous clay media, it was revealed that this media provided good performance of retaining microbes effectively. In addition, $0.44~0.49kgVSS/kgBOD_{rem}$. of low sludge reduction was expected. The most efficient back washing cycle and procedure were once per 4 to 9 days and air including collapse-pulsing method, respectively. Therefore, this system can be of use as an weaving wastewater treatment for reuse.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.366-366
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• 2009

후면접합 태양전지는 상용 태양전지의 수평전류 손실(lateral current loss) 이 없으며, 전면전극에 의해 발생하는 그림자 손실(shading loss) 줄인 고효율 태양전지의 하나이다. 생성된 반송자가 후면에 위치한 전극에서 수집되기 때문에 효율향상을 위해서는 불순물에 의한 재결합을 줄이는 것이 중요하다. 따라서 Gettering 은 높은 소수반송자 수명(life-time)을 가지는 고품위 실리콘 기판은 고효율 실리콘태양전지 제작을 위한 중요 요소 기술이다. 본 연구에서는 n-type c-Si 기판을 이용한 고효율 실리콘 이종접합 태양전지제작을 위해 external gettering 공정을 이용하여 고품위 실리콘 기판을 제작하였다. POC13 doping process 의 온도, 시간을 변화시킴으로써 이에 따른 변화를 관찰하였다. 주사전자현미경(SEM)를 통해 etch pit 을 확인 했으며,Four point probe 를 통해 면저항을 측정, 인(P)의 농도를 계산 하였다. 계산된 면저항을 통해 인(P)의 확산 깊이를 계산하였다. Iodine passivation 된 시편을 Qusi-steady state photoconductance (QSSPC)를 이용하여 소수반송자 수명을 측정함으로써 gettering 에 의한 bulk lifetime 향상 효과를 관찰하였다.

• 품질경영학회지
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• 제44권3호
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• pp.649-660
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• 2016

Purpose: The purpose of this study is to find empirical studies the causal relationship among positive defining representation, negative defining representation, surface acting, deep acting, dissatisfaction of job, and intention of job transfer. Methods: The collected data through the survey by customer satisfaction team of "A" company call center. Results: The result of this study is that emotion and behavior norm influence on deep act of expressing both positive impacts of the employees. Conclusion: Feelings of corporate representation norm is psychologically of employees that because it affects even also must facilitate the surface acts and internal acts of employees and job dissatisfaction at the same time due to emotional dissonance and emotional exhaustion and turnover are hidden on the back emotion norms in the contact department, it should be aware of the need to address the emotional problems. Companies need to develop a variety of programs with attention to addressing the emotional difficulties experienced by workers.

• 한국소음진동공학회논문집
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• 제15권12호
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• pp.1327-1331
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• 2005

This Paper addresses what amount of whole-body vibration is exposed to Korean pilots of UH60 helicopters during their mission flight. To measure the expose4 whole-body vibration, the 12-axis whole-body vibration measurement system was used. It enables the direct measurement of whole-body vibration exposed from the body contact area consisting of the feet, hip and back. The measured 12-axis vibration signals were used to evaluate the vibration comfort level experienced by the pilots of UH60 helicopters. The evaluated vibration comfort level is found to be closeto 0.74-0.79m/s, which is equivalent to the semantic scale of 'fairly uncomfortable'. To assess the health effects of whole-body vibration exposed to Korean pilots of UH60 helicopters during their mission flight, the rms-based and VDV(vibration dose value)-based evaluation schemes, recommended by ISO 2631-1:1977, were exploited in this work. The evaluated results indicate that Korean pilots cannot avoid the fatigue-decreased proficiency limit after two-hour continuous flight. The whole-body vibration level exposed from the UH60 helicopters during continuous 10-hours mission flight is found to reach to the vibration exposure limit.

• 한국자기학회지
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• 제26권6호
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• pp.206-212
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• 2016

대형 전동기에서 영구자석을 받치는 철제 받침대의 형상은 요크와의 결합력을 결정하는 매우 중요한 요소이다. 대형 전동기에서 받침대의 형상에 따라 요크와의 결합력 차이가 있다. 이 논문에서는 이중 받침대(Double bed)와 단일 받침대(Single bed)의 결합력을 가상공극 법을 통해 계산하여 차이점과 문제점을 제시하고 단일 받침대가 결합력 향상 측면에서 우위에 있음을 보여준다. 또한 받침대의 아래에 홈(Groove) 형상을 새김으로해서 받침대와 요크 간의 결합력이 향상됨을 보인다

• Macromolecular Research
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• 제17권1호
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• pp.31-36
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• 2009

Highly transparent, thin polythiophene (PT) films were successfully synthesized by the plasma polymerization of thiophene. These films were doped with $O_2$ plasma by in-situ doping technique. The plasma polymerized PT films were deposited at about 50 to 340 nm/min, depending on the temperature and plasma power. A resultant transparency as high as 85% was achieved. The plasma polymerized PT films exhibited the characteristics of an insulator or semiconductor ($10^{10{\sim}12}{\Omega}/{\Box}$, $10^{-7}S/cm$). The conductivity was immediately increased up to $10{\Omega}/{\Box}$ and $10^{-2}S/cm$, when doped with $O_2$ plasma. The plasma-doped PT films exhibited an increased surface roughness resulting in a decreased contact angle. However, the thickness of the PT layer was partially decomposed and/or etched with increasing voltage above 40 W.

• 재활복지공학회논문지
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• 제10권1호
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• pp.73-79
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• 2016

본 논문에서는 경부통증완화에 효과적인 맥킨지 운동(Mckenzie exercise)이 가능한 경부 재활로봇(cervical rehabilitation robot)을 제안한다. 이 로봇은 목의 좌우 측방굴곡, 전방향의 굴곡 및 후방향의 신전이 가능하도록 2자유도를 가지며, 맥킨지의 경부 스트레칭과 등척성 운동이 가능하다. 재활로봇의 기구부는 의자에 거치할 수 있어 가정에서 의자에 앉은 채로 맥킨지 운동을 할 수 있도록 설계하였다. 실험에서는 피험자가 프로토타입 경부 재활로봇을 착용하고 맥킨지 운동을 수행시 전후좌우의 굴곡과 신전 각도를 측정하고, 동시에 목주위의 표면 근전도와 머리부착부위의 압력을 측정하여 로봇의 성능을 평가하였다. 이 실험의 결과로부터 본 연구에서 제안한 경부 맥킨지 운동용 재활로봇이 적용가능함을 보였다.

• 한국재료학회지
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• 제24권3호
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• pp.123-128
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• 2014

To realize high-performance thin film solar cells, we prepared CIGS by the co-evaporation technique on both sodalime and Corning glass substrates. The structural and efficient properties were investigated by varying the thickness of the Mo:Na layer, where the total thickness of the back contact was fixed at 1${\mu}m$. As a result, when the Mo:Na thickness was 300 nm on soda-lime glass, the measured Na content was 0.28 %, the surface morphology was a plate-like compact structure, and the crystallinity by XRD showed a strong peak of (112) preferential orientation together with relatively intense (220) and (204) peaks as the secondary phases influenced crystal formation. In addition, the substrates on soda-lime glass effected the lowest surface roughness of 2.76 nm and the highest carrier density and short circuit current. Through the optimization of the Mo:Na layer, a solar conversion efficiency of 11.34% was achieved. When using the Corning glass, a rather low conversion efficiency of 9.59% was obtained. To determine the effects of the concentration of sodium and in order to develop a highefficiency solar cells, a very small amount of sodium was added to the soda lime glass substrate.

• 한국표면공학회지
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• 제41권1호
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• pp.12-15
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• 2008

The zinc oxide(ZnO) nanowires were deposited on Si(001) substrates by thermal chemical vapour deposition without any catalysts. SEM data suggested that the grown nanostructures were the well-aligned ZnO single crystals with preferential orientation. Back-gate ZnO nanowire field effect transistors(FET) were successfully fabricated using a photolithography process. The fabricated nanowire FET exhibits good contact between the ZnO nonowire and Au metal electrodes. Based on I-V characteristics it was found out that the ZnO nanowire revealed a characteristic of n-type field effect transistor. The drain current increases with increasing drain voltage, and the slopes of the $I_{ds}-V_{ds}$ curves are dependent on the gate voltage.

• 대한간호학회지
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• 제29권1호
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• pp.183-195
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• 1999

The purpose of this study is to describe the health care status of Korean Immigrants in New Zealand. The sample consisted of 155 Koreans who were randomly selected from the Korean Immigrants telephone book in Auckland, N.Z. They had health problems that required health management both physically (50.3%) and psychologically(70.3%). During the previous year, the average rate of medical contact with a general practitioner was 1$\pm$1.29 times. Korean immigrants who had health problems first attempted to resolve the problem through self medication rather than utilize health care services. They would only visit a general practitioner if they had severe subjective symptoms or no relief from self medication. Even if they think they need to visit the health care service, 41.9% of the subjects did not go back for follow-up care. Generally, the person who demonstrated positive health care behaviors was male, a college level graduate or higher, lived in N.Z. longer than 2 years, had a high score on health status by self assessment, and he placed few demands on health care services. Barriers to a healthy lifestyle are communication difficulties in expressing subjective symptoms, understanding the physician's treatment and medication plans, difficulty in accessing the appointment system and the high cost of service.