• 정보처리학회논문지C
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• 제8C권6호
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• pp.865-874
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• 2001

본 논문에서는 Home Phoneline Neworking Aliance(Home PNA) 장치에 연결된 많은 가입자들로부터 야기될수 있는 대역폭 서비스 불균형 현상을 해결하고 이 장비를 이용하는 가입자들을 관리하기 위한 웹 기반 Home PNA 장치 관리시스템을 구현하였다. Simple-Net-work Managment Protocol(SNMP) 를 탑대한 Home PNA장치를 관리하기 위해서 관리항목을 Muti Dewling Unit(MDU) 장비으 Management Information Base(MB)로 부터 추출한 MIB 오브젝트를 이용하여 시스템관리, 포트관리, 성능관리, 장애관리로 분류하였다. 시스템관리는 개별 MDU 장비에 대해 구성정보를 제공하고, 포트관리는 현재 가입되어 있는 가입자에 대한 현황정보를 제공하고 비인가 가입자에 대한 필터링을 수행한다 그리고 성능관리는 트렁크 라인과 가입자 라인의 트랙픽 정보를 제공한다. 마지막으로 장애관리는 예외 상황에 대한 장애로그 및 trap 메시지를 제공한다. 구현된 시스템의 운영성을 시험하기 위하여 실제 네트워크에서 그 동작성을 검증하였다.

• 한국차세대컴퓨팅학회논문지
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• 제13권3호
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• pp.26-33
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• 2017

최근 클라우드 플랫폼을 효율적으로 사용하기 위한 컨테이너 기술들이 주목을 받고 있다. 컨테이너 가상화 기술은 기존 하이퍼바이저와 비교하였을 때 이식성이 뛰어나고 집적도가 높다는 장점을 가지고 있다. 하지만 컨테이너 가상화 기술은 하나의 커널을 공유하여 복수개의 인스턴스를 구동하는 운영체제 레벨의 가상화 기술을 사용하기 때문에 인스턴스 간 공유 자원 요소가 많아져 취약성 또한 증가하는 보안 문제를 가지고 있다. 컨테이너는 컴퓨팅 자원의 효율적 운용을 위해 호스트 운영체제의 라이브러리를 공유하는 특성으로 인해 공격자는 커널의 취약점을 이용하여 호스트 운영체제의 루트 권한 획득 공격이 가능하다. 본 논문에서는 컨테이너가 사용하는 특정 메모리 영역의 변화를 감지하고, 감지 시에는 해당 컨테이너의 동작을 중지시키는 메모리 트랩 기법을 사용하여 컨테이너 내부에서 발생되는 호스트 운영체제의 루트 권한 탈취 공격을 효율적으로 탐지 및 대응하기 위한 프레임워크를 제안한다.

• 수산해양기술연구
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• 제49권4호
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• pp.459-468
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• 2013

In the application of the ecosystem-based fisheries assessment Jeonnam marine ranching ecosystem, two fisheries, funnel fishery and trap fishery, were selected as target fisheries. Black seabream, Acanthopagru schlegelii, rock bream, Sebastes inermis, gray mullet, Mugil cephalus, were selected as target species for the funnel fishery, and conger eel, Conger myriaster, was target species for the trap fishery. For assessing indicators of four management objectives, that is the maintenance of sustainability, biodiversity, habitat quality and socio-economic benefits, indicators were selected considering the availability of data, which were 5 indicators for sustainability, 3 indicators for biodiversity, 4 indicators for habitat, 2 indicators for socio-economic benefit. The Objective risk indices for sustainability and biodiversity of two fisheries were estimated at yellow zone, medium risk level. The objective risk indices for habitat and socio-economic benefit were estimated at green zone, safe level. The species risk indices (SRI) were estimated at yellow zone. The fishery risk indices (FRIs) were estimated at 1.143 and 1.400 for funnel net fishery and trap fishery, respectively. Finally the ecosystem risk index estimated at 1.184.

• Mass Spectrometry Letters
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• 제5권1호
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• pp.24-29
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• 2014

An advanced and reliable high performance liquid chromatography (HPLC)/ultraviolet detector (UV)/ion-trap time-of-flight (IT-TOF) mass spectrometry was developed for the simultaneous quantification of 19 marker compounds in Bang-poong-tong-sung-san (BPTS), a traditional oriental prescription. Various parameters affecting HPLC separation and IT-TOF detection were investigated, and optimized conditions were identified. The separation was achieved on a Capcell PAK C18 column ($1.5mm{\times}250mm$, $5{\mu}m$ particle size) using a gradient elution of acetonitrile and water containing 0.1% formic acid at a flow rate of 0.1 mL/min. The column temperature was maintained at $40^{\circ}C$ and the injection volume was $2{\mu}L$. IT-TOF system was equipped with an electrospray ion source (ESI) operating in positive or negative ion mode. The optimized electrospray ionization parameters were as follows: ion spray voltage, +4.5 kV (positive ion mode), or -3.5 kV (negative ion mode); drying gas ($N_2$), 1.5 L/min; heat block temperature, $200^{\circ}C$. Automatic $MS^n$ (n = 1~3) analyses were carried out to obtain structural information of analytes. Elemental compositions and their mass errors were calculated based on their accurate masses obtained from a formula predictor software. The marker compounds in BPTS were identified by comparisons between $MS^n$ spectra from standards and those from extracts. Moreover, the libraries of $MS^2$ and $MS^3$ spectra and accurate masses of parent and fragment ions for marker compounds were constructed. The developed method was successfully applied to the BPTS extracts and identified 17 out of 19 marker compounds in the BPTS extracts.

• 수산해양기술연구
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• 제50권3호
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• pp.252-261
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• 2014

Marine casualties originated from fishing vessel occupied about 70% of the whole marine casualties in Korea from 2001 to 2010, this ratio was not much changed as it was before. Therefore a pragmatic counterplan to decrease of casualties in fishing vessel is indispensable for reduction of the nationwide marine casualties. But since the casualties occurred by fishing vessel may have a different causes and counterplan according to the operating type of it, in this paper, fishing vessels classified into 12 types by operating method and inspected the causes and counterplan for that. The operating type of fishing vessel occurred the specific casualties more were jig boat in collisions and fire explosion, trap fishing boat, mixed fishing boats and inshore gill netter in collisions, stow netter in machinery damages and capsizing, offshore gill netter in machinery damages, fish carrier in collisions. It must be emphasized that the higher ranked types of vessels, especially jig boat have to take special care to the approaching vessels under way, trap fishing boat to rear look out and mixed fishing boat must keep on safety speed and be taken an education for advance the skill of operating radar as well. For all 12 types of fishing vessel, it is necessary for an operator to make strict precaution on the other vessel under way systematically and keep the regulation for preventing collisions, and for an engineer on watch to make a check the electricity and the engines periodically for reduction the fire explosion and machinery damages.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.82-92
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• 2011

This paper presents a PFC(Power Factor Correction) system to control the power factor of input current of the converter system which is working in the propulsion system of KTX high speed train. In the KTX train system, initially introduced from ALSTOM, the thyristor converter with phase controlling technique is adopted in the current fed type powering system. The input current induces harmonic losses highly because the waveform becomes rectangular shapes according to the filter inductor current increased as the train speed increasing gradually. Especially the interference with the signalling systems is severe concerned due to high current harmonics on the catenary line. To protect this problem, a frequency trap filter(notch filter) is operating with the input converter system. In this paper, an analysis work and PC simulation have been done on the PFC system to upgrade its performance and maintenance efficiency.

• Journal of Nutrition and Health
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• 제37권4호
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• pp.281-290
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• 2004

The purpose of this project was to evaluate whether daily fruit juice consumption could reduce the DNA damage in healthy subjects. The study was performed using 67 healthy volunteers (29 smokers, 38 nonsmokers) who were supple-mented with 480 m1 of grape juice for 8 weeks. Eight weeks of grape juice consumption did not change any anthropometric parameters. Lymphocyte DNA damage before the study was significantly greater (p<0.05) in smoker than nonsmoker, but, grape juice consumption significantly reduced DNA damage in both smoker (26%) and nonsmoker (I7%) to the level where there was no difference remained between the two groups after the intervention trial. This preventive effect of grape juice against DNA damage was not affected by sex of the subjects in non-smokers. Plasma $\alpha$-carotene, Iyco-pene and ${\gamma}$-totopherol was significantly increased after the trial in smokers, while erythrocyte catalase was significan-tly increased in both smokers and nonsmokers. Total radical-trapping antioxidant potential (TRAP) level in all subjects was significantly reduced after the intervention, while GSH-Px activity was increased only in nonsmokers. These results suggests that daily consumption of grape juice may protect DNA damage in peripheral lymphocytes, and supports the hypothesis that grape juice might exert their effect partially via a decrease in oxidative damage to DNA in humans partly by improving their antioxidative defense system.

• 대한예방한의학회지
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• 제19권2호
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• pp.135-144
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• 2015

Objective : Saengmaek-san (SM) has been commonly used in Korea to treat various diseases that involve the respiratory and cardiovascular system. However, to date, the mechanism underlying the effects of osteoclasts differentiation of SM has not been clearly understood. Method : To evaluate the effect of SM on osteoclast differentiation, we induced RAW 264.7 cells to be differentiated to osteoclasts by RANKL, and we performed RT-PCR to measure gene expression. Results : SM decreased the number of TRAP(+) MNCs in RANKL-induced osteoclast. SM decreased the expression of MMP-9, cathepsin K1, TRAP, NFATc1, MITF, and COX-2 in the osteoclast. But SM increased the expression of iNOS, $TNF-{\alpha}$ and IL-6 in osteoclast. Conclusion : It is concluded that SM might decrease the bone resorption resulted from decrease of osteoclast differentiation and it's related gene expression.

• 농촌계획
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• 제10권1호
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• pp.19-26
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• 2004

In this paper, forestry area change effect on the soil erosion in Asan lake watershed was estimated. Temporal variations of land use in the study watershed were analyzed from Landsat-5 TM remote sensing images. Geographic Information System (GIS) combined with Universal Soil Loss Equation (USLE) was used to estimate the soil erosion of Asan lake watershed. Spatial data for each USLE factors was obtained from the Landsat-5 TM remote sensing images and 1/25,000 scale digital contour maps. Sediment yield to Asan lake was estimated by sediment delivery ratio and sediment accumulation in lake was estimated by trap efficiency. The estimation methods were validated for sediment accumulation in Asan lake. From the hydrographic survey from 1974 to 2003 for Asan lake, sediment accumulation was measured. The estimated accumulation sediment of 303,569ton/yr showed similar value with observed of 295,888ton/yr. From the validated estimation methods, the increasing amount of soil erosion when 1% of forest area in Asan lake watershed decreases was calculated from 12.91 to 1482.05ton/yr.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.257-257
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• 2011

The amorphous indium-gallium-zinc-oxide (a-IGZO) materials for use in high performance display research fields are strongly investigated due to its good performance, such as high mobility and better transparency. However, the stability of a-IGZO materials is increasingly becoming one of critical issues due to the sub-gap electron trap sites induced by rough interfaces during deposition processing. It is well-known that the threshold voltage shift is related to interface roughness and oxygen vacancy formed by breaking weak chemical bonds. Here, we report the better properties of transparent oxide transistors by reducing the threshold voltage shift with an external rf plasma supported magnetron sputtering system. Mainly, our sputtering method causes the surface of sample to be sleek, so that it prevents the formation of various defects, such as shallow electron trap sites in the interface. External rf power was applied from 0 to 50W during RF sputtering process to enhance the stability of our oxide transistor without having a large voltage shift. To observe the effects of external rf-plasma source on the properties of our devices, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Transmission Electron Microscopy (TEM) are carried out to observe surface roughness and morphology of sputtered thin film. In addition, typical electrical properties, such as I-V characteristics are analyzed.