• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2015.10a
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• pp.322-323
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• 2015

Traditional rotation type large beacon was characterized by frequent failure, long repair time and high cost etc. These problems are caused by traditional light sources(metal halide lamps or tungsten halogen lamps). In order to solve these problems, IALA standards-based(efficiency and reliability) large LED beacon technologies are needed. we developed by applying a LED. The object of the this project, to design a reflective optics and the high power LED lighting engine module. And to develop a rotational speed control system for controlling flash pattern of beacon. As a result, to develop of LED beacon for landfall mark that distance to reach the light 20NM to 27NM.

• Journal of Korean Society of Environmental Engineers
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• v.22 no.1
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• pp.179-185
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• 2000

In this study, we examined the movement of chlorophenol as a precursor of the dioxin in the after-combustion to minimize the creation and emission of dioxin in a municipal waste incinerator. The CPs was injected to the electric incinerator in temperature $300{\sim}500^{\circ}C$, using $N_2$ gas to control the reaction time, The oxygen quantity supplied into the $CP_s's$ isomer combustion was added with the value of experience formula. When the space velocity in reactor was 60~80/sec, the removal efficiency of CP was obtained in the presence of Mo-V catalyst and non catalyst. The efficiency in non-catalyst was 74% to 80% mono-CP, di-CP 55~66%, tri-CP 50~58%, while mono-CP 90~99.9%, di-CP 96~97%, tri-CP 76~99% in a catalyst. Consequently, it was shown that these were 20~30% more efficienct than those.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.9
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• pp.4335-4341
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• 2013

This study was performed to evaluate the prevalence and risk factors of colonic polyps which is an established premalignant lesion and to provide basic data for the management of colon cancer in asymptomatic adults. The subjects of this study were 995 persons who underwent screening colonoscopy between January to December 2010 in health promotion center of an University Hospital located in Busan, and structured questionnaire, medical questionnaire, medical records were reviewed retrospectively. The data were analyzed by SPSS 18.0 program. Colonic polyps were found in 63.2% of the subjects. The prevalence rate of colonic polyps was significantly higher in males and it increased with age. Age, sex and exercise were found to be related independently to colonic polyps. Early detection of colonic polyps by colonoscopy is important for adults over 40 years, and it is necessary to advise such subjects to correct a wrong life-style in order to primarily prevent the development of colonic polyps.

• Korean Journal of Plant Resources
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• v.35 no.2
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• pp.380-384
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• 2022

In this study, we investigated in vitro anti-obesity activity of Parthenocissus tricuspidata (Siebold & Zucc.) Planch stem (PTS) in mouse adipocytes 3T3-L1 cells. PTS inhibited lipid accumulation and reduced the expression level of the proteins such as C/EBPα, PPARγ and FABP4 associated with adipogenesis in 3T3-L1 cells. In addition, PTS increased lipolysis-related protein expression such as p-AMPK, ATGL and p-HSL, and reduced perilipin-1 in 3T3-L1 cells. Taken together, PTS may have anti-obesity activity through inhibiting adipogenesis and inducing lipid lipolysis in adipocytes. Based on these results, PTS is expected to be used as a potential functional agent for anti-obesity.

• Journal of Korean Society of Forest Science
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• v.99 no.1
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• pp.57-61
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• 2010

Data with collected from 278 trees sampled through out the climatic range of Quercus acuta in Jeju Experiment Forests. The models tested to select the best-fit equations form the Max & Burkhart's model, Kozak's model, and Lee's model. Performance of the equations in predicting of residuals on predicted values. In result, all three models gave slightly better values of fit statistics. In plotting residuals against predicted diameter, Max & Burkhart's model showed underestimation in predicting small diameter and Lee's Model did the same in predicting small diameter. Based on the above analysis of three models in predicting stem taper, Kozak's model was chosen for the best-fit stem taper equations, and its parameter estimates was given for Quercus acuta. Kozak's model was used to develop a stem volume table outside bark for Quercus acuta.

• Proceedings of the Korean Society of Community Living Science Conference
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• 2003.11a
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• pp.140-140
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• 2003

호박(Cucurbita moschta DUCH)은 한국인들이 즐겨먹는 식용자원으로서 독특한 향미와 약리작용을 갖고 있다. 또한 기후 환경에 대한 적응력이 높고 병해충에도 비교적 강하여 농약사용이 적은 무공해 식품으로 알려져 있다. 호박의 과육에는 혈전증 예방과 두뇌발달에 기여하는 $\alpha$-linoleic acid가 다량 함유되어 있고, 비타민 A의 전구체인 $\beta$-carotene이 풍부하며, 위장이 약한 사람, 회복기의 환자, 부기가 있는 산모에게 좋은 식품으로 애용되어 왔다. 또한 예로부터 호박씨는 독성이 없으므로 어린이, 임산부, 허약자의 조충, 구제약으로 또는 젖이 잘 나지 않을 때에도 많이 쓰여왔다. 그리고 호박꽃은 잎과 함께 식용으로 널리 이용되었을 뿐 아니라 벌레에 물렸거나 상처 난 곳에 으깨어 문지르면 효과가 있어 민간요법으로 사용되어 왔다. 따라서 본 연구에서는 우리나라 전역에서 쉽게 구할 수 있는 호박꽃의 생리활성능을 검색해 봄으로써 천연기능성 식품 소재로의 활용가능성을 제시해 보고자 하였다.

• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.211-214
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• 2001

최근 입자를 이용한 색전술의 재료로서 광범위하게 사용되는 폴리비닐알코올(poly (vinyl alcohol) (PVA)) 입자는 전형적인 혼성배열(atactic)이다[1]. 제조된 PVA 입자가 고내구성 및 혈액내에서 안정성을 나타내기 위해서는 중합된 PVA 입자의 분자량 뿐만 아니라 교대배열성(syndiotacticity)도 커야 한다. 교대배열기(sydiotactic group)를 풍부하게 함유하고 있는 고분자량의 PVA를 제조하기 위해서는 고분자량의 교대배열성 전구체가 얻어지도록 입체장애를 일으키는 에스테르기를 보유하고 있는 단량체를 사용하거나 중합방법을 개선하는 것이 필요하다. (중략)

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.917-920
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• 2005

본 논문에서는 광대역통합국가망에서 ATM-Metro 서비스의 망 구조 및 서비스 제공 방식을 분석한다. ATM-Metro 서비스를 제공함에 있어서 존재하는 보안 취약점 및 보안 공격을 분석하며, 이를 기반으로 안전하게 ATM-Metro 서비스를 제공하기 위한 일반적인 보안 강화 방안을 제시하고, ATM 접속 방식과 이더넷 접속 방식의 ATM 구간에서 보안 기능을 강호하기 위한 보안 모델을 제시한다. 또한 ATM-Metro Ethernet 구간에서 기본적인 보안 기능을 제공할 수 있는 VLAN 적용 방안을 제시하고, ATM-Metro서비스 전구간에서 보안성을 강화할 수 있는 방안을 제시한다.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3144-3146
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• 1999

$8{\sim}12$인치의 원형(또는 사각) PCB 기판에 수백 개의 고휘도 반도체 발광 다이오드(Light Emitting Diode. LED)와 구동 회로로 구성되는 LED 교통 신호등은 특정 파장대의 단색광을 발광하므로, 기존의 백열전구식 신호등에 비해 시인성이 좋고, 80 % 이상의 에너지 절약이 가능하다. 그러나 LED는 주위 온도에 따라 밝기가 변화하는 특성이 있다. 신호등은 기능상 외부 온도의 영향 없이 항상 일정한 광도를 유지해야 하므로, 본 논문에서는 외부 온도의 변화에 관계없이 일정한 광출력을 유지할 수 있는 LED 구동회로를 설계한다 이를 위해 정전압 및 정전류로 구동되는 LED의 온도에 따른 광출력 특성 실험이 수행되고, 이러한 데이터들을 바탕으로 정광출력 LED 신호등 구동회로가 설계되고 그 성능을 평가한다.

• Journal of Applied Biological Chemistry
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• v.60 no.1
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• pp.23-28
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• 2017

Amomum tsao-ko used as a traditional oriental herbal medicine, is indigenous to several Asia countries. In this study, we investigated anti-obesity activity of the ethanol extract of Amomum Taso-ko (A. tsao-ko). The ethanol extract of A. tsao-ko inhibited adipocyte differentiation using Oil Red O assay in 3T3-L1 cells. Inhibitory effect of the ethanol extract of A. tsao-ko on adipogenesis was modulated by down-regulation adipogenic transcriptional factor such as peroxisome proliferator-activated receptor ${\gamma}$ ($PPAR{\gamma}$), CCAAT-enhancer-binding protein ${\alpha}$ ($C/EBP{\alpha}$) and suppressed expression of fatty acid synthase, aP2, and resistin. We demonstrated that A. tsao-ko significantly inhibited adipogenesis and reduced $PPAR{\gamma}$ and $C/EBP{\alpha}$ expression in a dose-dependent manner. These results suggest that A. tsao-ko has an anti-obesity effect by inhibition of adipogenic transcription factor and adipocyte-specific genes in 3T3-L1 cells.