• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2006년도 가을 학술발표논문집 Vol.33 No.2 (C)
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• pp.535-539
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• 2006

미래 U-city 시대의 Health care 산업과 금융상거래 보안 및 사회안전 인증 장치로써 활성화 방안인 생체 칩은 2004년 10월 미 식품의약국(FDA)의 승인으로 더 큰 힘을 얻었다. 산업 전반적인 부분에 응용 가능한 생체 칩은 RFID 기술을 핵심기술로 사용하고 있으며, U-city 시대의 혁신적인 기술인 반면 개인정보 침해 및 법제도적, 윤리적, 전자파 유해성 이라는 문제점을 안고있다. 이 모든 문제점은 RFID 자체적인 문제점으로 많이 언급되어져 왔지만 생체 칩은 인체에 직접 사용한다는 점에서 더 큰 의미를 둔다. 현재 기술의 도입 시점인 생체 칩의 규제는 미국을 중심으로 가이드라인을 진행 중 이며, 우리 나라에서도 우려의 목소리가 높다. 본 연구는 사회적 인식이 부족한 생체 칩 기술 도입 전 미리 정보 보호 측면에서의 문제점을 분석하고 개선방향을 검토해 보고자 한다.

• 한국산학기술학회논문지
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• 제3권4호
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• pp.227-232
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• 2002

시각장애인의 보행을 유도하기 위한 전자보행기로, 소닉가이드, 모와트센서, 바이오닉 지팡이 등이 개발되었으나, 가격이 비싸거나, 훈련이 어렵다는 이유 등으로 국내에서는 거의 보급되어 있지 않고 있다. 따라서, 본 연구에서는 청각에 의한 장해물을 인식 개념을 고려하여 주변의 장해물의 파악에 특별한 훈련이 필요치 않으며, 저렴한 가격의 전자보행기의 개발 을 위한 기본 연구로 시각장애인의 장해물인지특성의 검토 및 장해물 인지특성을 고려한 초음파형 전자보행유도기의 프로토콜을 통한 보행시험을 실시하였다.

• Tribology and Lubricants
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• 제29권4호
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• pp.218-222
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• 2013

Water-lubricated ball bearings consist of rolling elements, an inner raceway, an outer raceway, a retainer, and an operating lubricant. In the water environment, ball bearings are required to sustain high loads at high speeds under poorly lubricated conditions. For the analysis of bearing behavior, friction torque is considered as the main factor at various flow rates, rotating speeds, and roughnesses between the rolling element and raceways. When the bearing operates at high rotating speeds, the friction torque between the raceway and rolling elements increases considerably. This frictional torque is an important factor affecting bearing reliability and life cycle duration. For understanding the flow conditions in the inner part of the bearing, this study focuses on the flow around the rotating and revolving rolling elements. A simple model of fluid flow inside the ball bearing is designed using the commercial CFD program ANSYS.

• 재활복지공학회논문지
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• 제11권1호
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• pp.81-89
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• 2017

본 논문은 대퇴절단 환자의 다양한 환경에서의 보행을 가능하게 하는 지능형 의족의 보행노면 및 보행단계 판별 기법을 제안한다. 제안하는 보행모드 변경 기법은 스트레인게이지 센서 만으로 보행노면 및 보행단계 판별이 가능한 단일 센서 기반의 알고리즘으로 기존 지능형 의족의 다중센서 기반 알고리즘의 단순화와 의족 시스템의 저가화가 가능하게 고안하였다. 보행노면 판별 알고리즘을 위해 정상인의 보행 중 발생하는 지면반발력의 특징을 분석하여 보행단계 세분화와 보행노면 검출 조건을 정의하였고, 대퇴절단 환자와 유사한 환경에서의 보행 실험을 위해 보행분석 장치를 제작하였다. 정의된 검출 조건과 제작된 기구를 통해 논문의 효용성 검증을 진행하였으며, 정상인 대상의 실험결과 단일 센서 기반 알고리즘의 정확도는 약 95%를 나타냈다. 제안하는 단일 센서 기반의 알고리즘을 통해 지능형 의족 시스템의 저가화가 가능할 것으로 판단되며 사용자가 직접 보행노면 상태를 파악하고 보행모드를 전환하는 수동 보행모드 변경 방식에서 벗어나 의족이 현재 보행 노면 상태를 파악하고 상황에 맞는 보행모드를 전환하는 자동보행 모드 변경이 가능할 것으로 확인되었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.33-33
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• 2009

Silicon nano-structures have great potential in bionic sensor applications. Atomic force microscopy (AFM) anodic oxidation have many advantages for the nanostructure fabrication, such as simple process in atmosphere at room temperature, compatibility with conventional Si process. In this work, we fabricated simple FET structures with channel width W~ 10nm (nanowire) and $1{\mu}m$ (nano-ribbon) on ~10, 20 and 100nm-thinned silicon-on-insulator (SOI) wafers in order to investigate the surface effect on the transport characteristics of nano-channel. For further quantitative analysis, we carried out the 2D numerical simulations to investigate the effect of channel surface states on the carrier distribution behavior inside the channel. The simulated 2D cross-sectional structures of fabricated devices had channel heights of H ~ 10, 20, and 100nm, widths of L ~ $1{\mu}m$ and 10nm respectively, where we simultaneously varied the channel surface charge density from $1{\times}10^{-9}$ to $1{\times}10^{-7}C/cm2$. It has been shown that the side-wall charge of nanowire channel mainly affect the I-V characteristics and this was confirmed by the 2D numerical simulations.

• Journal of Microbiology and Biotechnology
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• 제16권8호
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• pp.1248-1254
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• 2006

The effect of Spirulina platens is and probiotics as feed additives on the growth of the shrimp Fenneropenaeus chinensis was investigated in comparison with a control. The shrimp were cultured in rearing tanks in a seawater pond for 35 days from September 1, 2004. As regards the water quality, the probiotic treatment (T2, commercial diet and 3% probiotics) produced a lower TDN (total dissolved nitrogen) and TDP (total dissolved phosphorus), making it effective in water quality improvement. Nonetheless, the phytoplankton flora succeeded from diatoms to cyanobacteria, regardless of the feed additives. Treatment T3, including 3% S. platensis, produced the highest mean body weight, which was 39% higher than that for all the other treatments (P<0.05). Accordingly, it was found that the use of Spirulina and probiotics as feed additives increased the shrimp body weight and improved the water quality, respectively.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1588-1593
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• 2008

This paper describes a real-time isometric pinch force prediction algorithm from surface electromyogram (sEMG) using multilayer perceptron (MLP) for human robot interactive applications. The activities of seven muscles which are observable from surface electrodes and also related to the movements of the thumb and index finger joints were recorded during pinch force experiments. For the successful implementation of the real-time prediction algorithm, an off-line analysis was performed using the recorded activities. Four muscles were selected for the force prediction by using the Fisher linear discriminant analysis among seven muscles, and the four muscle activities provided effective information for mapping sEMG to the pinch force. The MLP structure was designed to make training efficient and to avoid both under- and over-fitting problems. The pinch force prediction algorithm was tested on five volunteers and the results were evaluated using two criteria: normalized root mean squared error (NRMSE) and correlation (CORR). The training time for the subjects was only 2 min 29 sec, but the prediction results were successful with NRMSE = 0.112 ${\pm}$ 0.082 and CORR = 0.932 ${\pm}$ 0.058. These results imply that the proposed algorithm is useful to measure the produced pinch force without force sensors in real-time. The possible applications include controlling bionic finger robot systems to overcome finger paralysis or amputation.

• 한국지하수토양환경학회지:지하수토양환경
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• 제15권3호
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• pp.27-33
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• 2010

The purpose of this study was in search of native plant species showing metal-resistant property and excessively accumulating heavy metals in metal-contaminated soil or abandoned mines as well as in evaluation of applicability of phytoremediation. In the study area, species showing excessively accumulating heavy metals were a shepherd´s purse, pampas grass, a Korean lettuce, a Hwansam vine, the Korean persicary, a foxtail, a goosefoot, and a water pepper. The first screened plant species in Sambo mine were as shepherd's purse, Korean lettuce and pampas grass Among them the shepherd´s purse can be excluded because it is a seasonal plant and has lower removal capacity for heavy metals. The Korean lettuce was also excluded because of having lower removal capacity for heavy metals. Pampas grass is a highly bionic plant species constantly growing from spring. However it has weak points such as little accumulation capacity for zinc as well as small values of an accumulation factor and a translocation factor. Another problem is regarded as removal of roots after the clean up if pampas grass is applied to a farmland. In Sanyang mine, wormwood and Sorijaengi were considered as adaptable species.

• 한국축산식품학회지
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• 제36권5호
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• pp.567-576
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• 2016

Poultry industry has always been a dynamic and integral part of national economies in many countries. Economic losses incur especially in large-scale rearing facilities, often attributed to the deterioration of environmental conditions, poultry exposure to stressors and development of diseases. While antibiotics have been commonly used for prophylactic purposes and as growth stimulants, extensive documentation of antimicrobial resistance among pathogenic bacteria due to indiscriminate utilization of antibiotic in the industry has led to public and governmental outcries. Elimination of antibiotics from poultry production has thus encouraged intensive search for alternatives. In this review, we discuss the immense potential of probiotics to fill the gap as alternative growth promoters and evidences of beneficial effects of probiotic application in poultry production.

• KSBB Journal
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• 제26권5호
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• pp.412-416
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• 2011

The conventional monitoring system for water pollution measurement is quite simple and independent and it has a lot of draw backs such as cost, installation, etc. So, in this paper, we have measured the water pollution system through a bacterial species, photobacterium phosphoreum. A novel integrated monitoring system technology has been developed which could easily dictate and analyze the major water pollutants and its surrounding environment in an accurate way. The system constitutes of bionic technology, information technology and environmental engineering technology. As a result, integrated monitoring system can observe the water pollution and various water environment of the whole country. Also, through the sensors of USN, Zigbee, RFID and middle ware, which can provide service and construct service platform, a properly standardized plan with remarkable service platform has been established through this investigation.