• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1521_1522
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• 2009

Chemotaxis is the directed movement of cells in gradients of signaling molecules, an essential biological process that underlies morhpogenesis during development, and the recruitment of immune cells to sites of infection. Especially, bacterial chemotaxis has utilized as an important prelude to study metabolism, prey-predator relationship, symbiosis, other ecological interactions in microbial communities. Recently, novel analytical formats integrated with microfluidics were introduced to investigate the chemotaxis of the cells with the precise control of chemical gradient and small volume of cells. In this study, we present a method to detect bacterial chemotaxis by direct fluidic contacting. The developed fluidic-handling method is driven by capillary force, hydrophobic barrier and a cohesion force between fluids. We have investigated the chemotactic response of E Coli. and Pseudomonas aeruginosa to three kinds of chemoeffectors such as HEPES buffer, peptone and chloroform.

• 한국유기농업학회:학술대회논문집
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• 한국유기농업학회 2001년도 심포지엄
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• pp.248-265
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• 2001

Recently, agriculture in Korea is seriously depressed by economic globalization and trade liberalization because of low competitive power. Organic farming, which is favorable for small scale agriculture, is expected to be one of alternatives to boost agricultural activities in Korea. Organic agriculture requires systemic developments of new technologies considering the complex biological interaction within the system in connection with high quality and safety standard. The National Institute of Agricultural Science & Technology(NIAST) has been worked on the series of organic farming technologies, including bio-pesticides, pheromone, natural enemies as well as the testings of materials used in organic farming. NIAST will concentrate on the technological development for compromising to the conflict between commodity-oriented and ecological harmony. Research on systemic land and water use, management of plant nutrition, pest and disease control, post-harvest would also be important targets. Integrated efforts among researchers, professors, administrators, farmers, private sectors, and extension workers are substantial for fast technology development and its dissemination. Development and use of these technologies will homely enlighten the Korean organic farming although it may require quite a time and endeavor.

• 대한의용생체공학회:의공학회지
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• 제18권1호
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• pp.51-64
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• 1997

A dynamic model of the Korean total artificial heart(TAH) which contains a brushless DC motor, all of mechanical components, the pump system with integrated variable volume space(WS) and the circulatory system model including the bronchial circulation were established Two different sets of seven differential equations were separately derived for the left and right systolic period of the Korean TAH operation. Throughout the computer simulation, a full-state fEedback optimal controller that minimizes the power consumption of the Korean TAH and drives the end stage velocity of the energy converter to zero was developed based upon the optimal control theory. Robustness of the controller were also analyzed with the dynamic model of the Korean TAH.

• 보존과학연구
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• 통권21호
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• pp.5-55
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• 2000

The cultural properties are damaged by various causes according to the characteristics of material, the condition of preservation, and the period of time. Especially, biodeterioration makes lots of damages in organic properties than inorganic ones. The damages of wooden cultural properties by insects usually are caused by the three orders; Isoptera, Coleoptera, and Hymenoptera. As the result of investigation on the state of 141 buildings of wooden cultural properties in 1999, some of them were damaged by many kinds off actors; wasp, powder post beetle, cigarette beetle, termite, decay, and physical cracking. And it was found that the patterns of damages were related to species-specific habits of insects. There are several methods of pest control for the prevention of wooden cultural properties from damages caused by insects. Those are as follows; physical control, chemical control, biological control, and integrated pest management. When insects and fungi were detected at the wooden buildings, the fumigation is best treatment to stop biodeterioration. And then, wood materials also need to be treated with insecticidal and antiseptic chemicals to avoid a reinfestation, because the fumigant is volatile. The six commercial chemicals which are applied to the insecticidal and antiseptic treatment of wooden cultural properties were purchased to test their abilities. According to the comparative results of efficacy of them in laboratory, chemical D showed excellent efficacy in all items, including antiseptic and termiticidal items. The goal of these pest controls is to protect wooden buildings from insects and microorganisms. The most effective method used currently is chemical control(fumigation, insecticidal and anticeptic chemical treatment), but it has to be treated periodically to control pest effectively. Recently environmentally-friendly control methods such as bait system or biological treatments are replacing traditional barrier treatments using large amounts of chemicals. Especially, termite is a social insect which makes a colony. Although a building with fumigation treatment is safe for a while, once attacked building has a risk of damage by reinfestation of termite. Therefore, to control termites from damaged building, the entire colony including reproductives(queen and king) and larvae around buildings must beeliminated. Bait system can be used as a preventive measure in early detection of them through termites colony monitoring and baiting. It would be the most effective for termite control if bait system would be used together with the chemical controls.

• 대한토목학회논문집
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• 제40권3호
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• pp.331-336
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• 2020

국내에서는 아직 생소한 CM (Consequence Management; 사후대응관리)에 대한 개념이 현대의 재난 발생 유형과 포괄적 안보 개념 하에서 볼 때, 중요한 것임을 인지하고, 문헌연구를 진행하였다. 재난관리 선진국에서 활용하고 있는 CM 개념을 통합재난관리 측면과 포괄적 안보 개념 측면에서 한국에도 도입할 필요가 있으며, 특히 CBRNE (Chemical, Biological, Radiation, Nuclear and high yield Explosives) 상황 발생 시군이 주도적으로 대응해야 할 필요성을 확인하고, 미군의 CBRNE-CM 대응기관을 모델로 하여 한국군 CM 조직 발전방안을 제시하였다.

• 한국토양동물학회지
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• 제9권1_2호
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• pp.24-28
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• 2004

이리응애류는 잎응애류 뿐 아니라 녹응애류, 총채벌레등 많은 해충들의 중요한 포식자이다. 천안지역 배 과원에 봄과 가을 사이에 서식하는 이리응애류를 조사한 결과, 순 이리응애속 6종이 조사되었다. 긴털이리응애(Amblyseius womersleyi). 긴꼬리이리응애 (A. eharai)와 꽃병이리응애 (A. kokufuensi)는 주로 과수 잎에서, 알락이리응애 (A. makuwa)는 지면 잡초와 과수 주간에, 북방이리응애( A. finlandicus)는 과원 주변에서 발견되었다. 각 종의 분류학적 특징과 생태적 특성을 정리하여, 향후 배과원 응애류 종합관리 측면에서 생물적 방제 전략 수립 방안에 대해 고찰하였다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 춘계학술대회
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• pp.55-58
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• 1997

In this paper we reviewed and stated the present state of our team's research of the moving-actuator type total artificial heart (MA-TAH). Especially, this paper showed new direction of researches. The integrated research of battery, telemetry, TET is required. And the real-time supervisory of the state of hemodynamic variables and MA-TAH is also needed. These requirement made us to think the supervisory control system (SCS). As functional abilities of the SCS require very high computational cost, the digital signal processor is an appropriate choice for our need.

• 대한의용생체공학회:의공학회지
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• 제44권2호
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• pp.99-108
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• 2023

According to the COVID-19, development of various medical software based on IoT(Internet of Things) was accelerated. Especially, interest in a central software system that can remotely monitor and control ventilators is increasing to solve problems related to the continuous increase in severe COVID-19 patients. Since medical device software is closely related to human life, this study aims to develop central monitoring system that can remotely monitor and control multiple ventilators in compliance with medical device software development standards and to verify performance of system. In addition, to ensure the safety and reliability of this central monitoring system, this study also specifies risk management requirements that can identify hazardous situations and evaluate potential hazards and confirms the implementation of cybersecurity to protect against potential cyber threats, which can have serious consequences for patient safety. As a result, we obtained medical device software manufacturing certificates from MFDS(Ministry of Food and Drug Safety) through technical documents about performance verification, risk management and cybersecurity application.

• 생태와환경
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• 제54권4호
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• pp.265-271
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• 2021

갑각류 외골격은 키틴질로 이루어져 있고 외부자극에 보호와 지지를 위해 주요한 기능을 한다. 수환경은 물리적 변화뿐만 아니라 다양한 해양 오염에 끊임없이 영향을 받고 그 환경에 서식하는 생물은 생존을 위해 생물학적으로 반응한다. 본 연구에서는 이르가롤 독성노출이나 퇴적환경 중금속 분포에 따라 서식하는 칠게의 외골격 표면조도 분석을 통한 생태독성 종말점이 될 수 있음을 제시하였다. 칠게의 외골격 표면 조도는 이르가롤 노출에 대해 거칠기(Ra)도 감소하고 조도 변이(variation)도 줄어들었다. 또한 해양 연안 퇴적물 내 중금속(Cd, Pb, Hg) 분포에 따라 서식하는 칠게에서 표면 거칠기 및 변이가 변화하는 것을 확인하였다. 이러한 외골격 표면 거칠기의 변화는 외부환경 스트레스 요인에 따른 칠게의 생물학적인 반응 종말점(end-point)을 나타내며 나아가 외골격의 보호, 지지, 수송 등의 기능적 면에 영향을 미칠 수 있음을 시사한다. 이러한 접근방법은 공학과 생물의 융합적 기술로 수환경 모니터링을 위한 유용한 방법으로 활용될 수 있을 것이다.

• Current Optics and Photonics
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• 제1권1호
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• pp.51-59
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• 2017

In addition to its typical use for skin rejuvenation, fractional laser irradiation of early cancerous lesions may reduce the risk of tumor development as a byproduct of wound healing in the stroma after the controlled injury. While fractional ablative lasers are commonly used for cosmetic/aesthetic purposes (e.g., photorejuvenation, hair removal, and scar reduction), we propose a novel use of such laser treatments as a stromal treatment to delay tumorigenesis and suppress carcinogenesis. In this study, we found that non-ablative fractional laser (NAFL) irradiation may have a possible suppressive effect on early tumor growth in syngeneic mouse tumor models. We included two syngeneic mouse tumor models in irradiation groups and control groups. In the irradiation group, a thulium fiber based NAFL at 1927 nm was used to irradiate the skin area including the tumor injection region with 70 mJ/spot, while no laser irradiation was applied to the control group. Numerical simulation with the same experimental condition showed that thermal damage was confined only to the irradiation spots, sparing the adjacent tissue area. The irradiation groups of both tumor models showed smaller tumor volumes than the control group at an early tumor growth stage. We also detected elevated inflammatory cytokine levels a day after the NAFL irradiation. NAFL treatment of the stromal tissue could potentially be an alternative anticancer therapeutic modality for early tumorigenesis in a minimally invasive manner.