• Journal of the Korean Magnetics Society
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• v.12 no.6
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• pp.201-205
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• 2002

The tunneling magnetoresistance (TMR) of a ramp-edge type junction has been studied. The samples with a structure of NiO(60)/Co(10)/NiO(60)/Si$_3$N$_4$(2-6)/NiFe(10) (nm) were prepared by the sputtering and etched by the electron cyclotron (ECR) argon ion milling. Nonlinear I-V characteristics was obtained from a ramp-type tunneling junctions having the dominant difference between zero and ＋90 Oe perpendicular to the junction edge line. The voltage dependence of TMR was stable up to a bias volt of $\pm$10 V with a TMR ratio of about -10%, which may be very peculiar magnetic tunneling properties with asymmetric tunneling process between wedge Co pinned layer and NiFe free layer.

• Journal of Veterinary Clinics
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• v.27 no.2
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• pp.142-146
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• 2010

The purpose of this study is to establish experimental canine skin barrier disruption model in dog. The study was designed to investigate the predictive properties of acetone damage using as effect parameters transepidermal water loss (TEWL) and stratum corneum (SC) hydration. To compare the structures of SC intercellular lipids in normal and acetone damaged skin, TEM observations were performed. Six clinically normal, male Beagles without dermatological problems were chosen for this study. Acetone damage was performed at 48hrs after clipping. Efficacy measurements for TEWL and skin hydration were performed before ($t_1$) and after ($t_2$) damage in a temperature- and humidity-controlled room ($2{0\sim}22^{\circ}C$, 50-60%). TEWL and SC hydration values were decreased in the acetone damaged model compared with non damaged skin. In TEM observation of acetone damaged sample, the intercellular lipid lamellae exhibit abnormal and incomplete structure compared with those of normal skin. It seems that acetone damage would be one of canine skin epidermal barrier disruption model for the study of canine atopic dermatitis (AD) as well as dry skin in veterinary dermatology research.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.3
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• pp.579-584
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• 2012

In this paper, drain induced barrier lowering(DIBL) has been analyzed as one of short channel effects occurred in double gate(DG) MOSFET. The DIBL is very important short channel effects as phenomenon that barrier height becomes lower since drain voltage influences on potential barrier of source in short channel. The analytical potential distribution of Poisson equation, validated in previous papers, has been used to analyze DIBL. Since Gaussian function been used as carrier distribution for solving Poisson's equation to obtain analytical solution of potential distribution, we expect our results using this model agree with experimental results. The change of DIBL has been investigated for device parameters such as channel thickness, oxide thickness and channel doping concentration.

• The Journal of the Acoustical Society of Korea
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• v.31 no.8
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• pp.551-560
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• 2012

Target detection by acoustic barrier method includes active and passive sonar technique and time reversal process whose theoretical background is already well defined. In this paper, the concept and theory of underwater detection by passive ocean time reversal is established. Also, the reason that this study was conducted was to investigate feasibility of complex mathematical modeling to provide some predictive capability for underwater acoustic barrier with passive time reversal. It may eventually lead to a useful predictive tool when designing underwater acoustic barrier detection system using the passive time reversal concept.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.888-891
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• 2011

In this paper, drain induced barrier lowering(DIBL) has been analyzed as one of short channel effects occurred in double gate(DG) MOSFET. The DIBL is very important short channel effects as phenomenon that barrier height becomes lower since drain voltage influences on potential barrier of source in short channel. The analytical potential distribution of Poisson equation, validated in previous papers, has been used to analyze DIBL. Since Gaussian function been used as carrier distribution for solving Poisson's equation to obtain analytical solution of potential distribution, we expect our results using this model agree with experimental results. The change of DIBL has been investigated for device parameters such as channel thickness, oxide thickness and channel doping intensity.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.13-14
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• 2005

ZnO 단일 나노선 field effect transistor (FET) 소자의 2단자 전류-전압 특성을 조사해 보면 n-type 반도체 특성이 나타남을 알 수 있다. 그러나 2단자로 측정 할 경우 반도체 나노선과 금속 전극사이에 존재하는 접촉저항의 영향이 필연적으로 포함된다. 따라서 측정한 결과가 나노선에 의해서 나타나는 고유한 특성인지 접촉저항의 원인이 되는 에너지 장벽의 성질인지 명확히 밝힐 필요가 있다. 그래서 이번 연구에서는 4단자 측정방법을 이용하여 접촉저항 성분을 배제한 소자의 고유한 성질을 밝혀낼 뿐만 아니라, 이것을 2단자의 결과와 비교함으로써 접촉점에서 나타나는 에너지 장벽의 특징도 파악해 낼 수 있었다. 실험에서 사용된 ZnO FET 소자의 경우, 접촉점에서 생기는 에너지 장벽을 터널링을 통해 극복하는 것으로 분석되었고 이는 온도 변화에 따른 4 단자 및 2 단자 전류-전압 측정을 통해 확인될 수 있었다.

• Korean Journal of Food Science and Technology
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• v.40 no.6
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• pp.686-690
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• 2008

Recent research has shown that curcumin has beneficial effects in a variety of skin diseases, including scleroderma, psoriasis, and skin cancer. In this study, we assessed the effects of curcumin on epidermal permeability barrier function in vivo and in vitro. In order to evaluate the effects of curcumin on epidermal permeability barrier function in vivo, hairless rats were exposed to UVB irradiation, and curcumin was administered orally at a dosage of 150 mg/kg per day for 8 weeks. Transepidermal water loss (TEWL) and epidermal thickness were measured at the end of the experiment. The expression of filaggrin, a marker of keratinocyte differentiation, and serine palmitoyltransferase (SPT), a marker of the formation of the stratum corneum lipid barrier, in human HaCat keratinocytes were analyzed. The in vivo results showed that an 8 week administration of curcumin markedly prevented the UVB-induced increase in TEWL. The UV-induced increase in epidermal thickness was also reduced significantly by curcumin treatment. The in vitro results demonstrated the concentration-dependent effects of curcumin on the expression of both filaggrin and SPT in HaCat cells, reflecting the notion that curcumin can induce epidermal keratinocyte differentiation and can improve the recovery of skin barrier functions. These results show that curcumin is a promising candidate for the improvement of epidermal permeability barrier function.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10b
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• pp.1545-1548
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• 2000

본 고는 인터넷 이용자가 원하는 웹페이지 링크시 발생할 수 있는 여러 가지 문제 중, 언어적인 장벽을 해결하기 위한 시스템을 설계하고 이를 이용하여 언어적인 문제를 해결할 수 있는 방법을 제시한다. 인터넷 이용자의 DNS 서버와 로컬 데이터베이스를 이용하여 인터넷 이용자의 언어 정보를 추정하고, 추정한 언어로 구성된 웹페이지를 인터넷 이용자에게 제공하는 시스템을 설계한 것이다. 이로 인해, 인터넷 이용자들에게 발생하는 언어적인 장벽 문제 해결, 웹페이지 상에서의 불필요한 클릭 수 감소, 웹페이지 링크 수 증가, 시간 절약 등의 여러 가지 편의를 제공할 수 있다.

• Journal of vocational education research
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• v.30 no.4
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• pp.259-279
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• 2011

The purpose of this study was to analyze a structural relations which occur when college students' inner and outer career barrier impacts on career decision status through the mediating variables of career decision making self-efficacy and career aspiration. The data of 787 college students subjects were collected for the study. The measuring tools were Career Decision Status, Outer Career Barriers, Inner Career Barriers, Career Aspiration, and Career Decision Making Self-Efficacy. The collected data were analyzed with structural equation modeling(SEM). The findings of the study were as follows. Results showed that only inner career barriers affect career decision status through the mediating variables of career decision making self-efficacy and career aspiration among outer and inner career barriers anticipated to give negative impact on level of career decision making. Inner career barriers affect career decision making self-efficacy negatively, and career decision making self-efficacy gives positive impact on career aspiration, and career aspiration affects career decision status negatively. In other words, the more aware of inner career barriers, the lower career decision making self-efficacy.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.519-519
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• 2013

본 연구에서는, 전기적 충격이 없고 넓은 면적을 동시에 처리할 수 있는 형태의 유전체 장벽 방전(DBD: Dielectric Barrier Discharge)을 이용한 대기압 저온 플라즈마 장치를 제작하고 이를 이용하여 빵 곰팡이(Neurospora crassa) 살균에 대한 기본 분석을 하였다. 실험에 사용한 저온 대기압 면방전 플라즈마의 파워는 사인파 교류전압을 인가하여, 방전전압은 1.4~2.3 kV, 방전전류는 20~30 mA의 값을 가지며, 전압과 전류의 위상차는 약 80도의 기울기 차이가 난다. 이때의 출력은 약 4 W를 가지며, 공랭식 쿨러를 이용하여 유전체의 열을 배출하였다. 시료대의 온도 측정결과 방전과 동시에 쿨러를 작동할 경우 최대 10분에서 37도를 넘지 않았다. 장치에서 발생하는 플라즈마에 의한 O3의 양은 플라즈마 발생부로부터 10 mm 이내에서 약 25~30 ppm 이 측정되었으며, NO나 NO2 는 거의 검지되지 않았다. 증류수(Deionized water)속에 담긴 빵 곰팡이(Neurospora crassa) 포자를 면방전 플라즈마 발생장치로 처리하였을 때, 포자의 발아율은 처리시간 및 출력파워가 증가함에 따라 급격히 감소하였으나 VM (Vogel's Minimal) 배양액에 넣고 플라즈마 처리를 한 경우에는, 증류수의 결과와 달리 살균효과가 미비함을 보였다. MTT 측정법 또한 같은 경향성을 보였으며, 이를 통해 포자를 둘러싸고 있는 환경이 플라즈마의 살균효과에 영향을 미치는 것으로 보인다. 본 실험을 통해, 유전체 장벽을 이용한 면방전 플라즈마 발생장치가 플라즈마 제트(jet)와 달리 직접적인 플라즈마 접촉 없이도 미생물 살균이 가능하다는 것을 보았으며, 처리대상의 생체용액과 같은 주변 환경에 영향을 받음을 알 수 있었다. 또한 면방전 플라즈마 장치로부터 발생하는 O3과 같은 활성종들이 빵 곰팡이의 비활성화에도 역할을 할 수 있음을 알 수 있었다.