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CFAR 적용시 섹션 크기 가변화를 이용한 오표적의 효율적 제거
노지은,최병관,이희영,Roh, Ji-Eun,Choi, Beyung-Gwan,Lee, Hee-Young 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
Generally, because received signals from radar are very bulky, the data are divided into manageable size called section, and sections are distributed into several digital signal processors. And then, target detection algorithms are applied simultaneously in each processor. CFAR(Constant False Alarm Rate) algorithm, which is the most popular target detection algorithm, can estimate accurate threshold values to determine which signals are targets or noises within center-cut of section allocated to each processor. However, its estimation precision is diminished in section edge data because of insufficient surrounding data to be referred. Especially this edge problem of CFAR is too serious if we have many sections to be processed, because it causes many false alarms in most every section edges. This paper describes false alarm issues on MCA(Minimum Cell Average)-CFAR, and proposes a false alarm elimination method by changing section size alternatively. Real received data from multi-function radar were used to evaluate a proposed method, and we show that our method drastically decreases false alarms without missing real targets, and improves detection performance.
노지은,이상현 한국지진공학회 2019 한국지진공학회논문집 Vol.23 No.2
n this study, a design procedure for the practical application of the dampers to building structures under earthquake loads was presented by using earthquake response spectrum. Nonlinear time history results using a 10 story building structure installed with damper verified the effectiveness of the proposed procedure by showing that the structural response could be reduced to the target performance level for seismic loads. Since the proposed design procedures are based on response spectrum seismic analysis result of the original structure, the capacity, location and the number of damper and the consequent response reduction effects can be preliminarily determined without performing the nonlinear time history analysis.
노지은,김영석,김형민,박경희,이권은,Prakash Khadka,윤지애,박주현,장숙태,이종휘,정지훈,이재휘 대한약리학회 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.1
Retinyl palmitate (RP)-loaded pectinate micro- and nano-particles (PMP and PNP) were designedfor stabilization of RP that is widely used as an anti-wrinkle agent in anti-aging cosmeceuticals. PMP/PNP were prepared with an ionotropic gelation method, and anti-oxidative activity of the particleswas measured with a DPPH assay. The stability of RP in the particles along with pectin gel andethanolic solution was then evaluated. In vitro release and skin permeation studies were performedusing Franz diffusion cells. Distribution of RP in each skin tissue (stratum corneum, epidermis, anddermis) was also determined. PMP and PNP could be prepared with mean particle size diameters of593∼843 μm (PMP) and 530 nm (i.e., 0.53 μm, PNP). Anti-oxidative activity of PNP was greaterthan PMP due largely to larger surface area available for PNP. The stability of RP in PMP and PNPwas similar but much greater than RP in pectin bulk gels and ethanolic solution. PMP and PNP showedthe abilities to constantly release RP and it could be permeated across the model artificial membraneand rat whole skin. RP was serially deposited throughout the skin layers. This study implies RP loadedPMP and PNP are expected to be advantageous for improved anti-wrinkle effects.
Anti-Oxidative Activity of Pectin and Its Stabilizing Effect on Retinyl Palmitate
노지은,김영석,김형민,장성백,이현주,Suharto Chakma,정지훈,이재휘 대한약리학회 2013 The Korean Journal of Physiology & Pharmacology Vol.17 No.3
The purpose of this study was to examine the anti-oxidative activity of pectin and other polysaccharides in order to develop a cosmeceutical base having anti-oxidative effects towards retinyl palmitate (RP). The anti-oxidative stabilizing effects of pectin and other polysaccharides on RP were evaluated by DPPH assay and then the stabilizing effect of pectin on RP was examined as a function of time. Among the polysaccharides we examined, pectin exhibited a considerably higher anti-oxidative activity,with an approximately 5-fold greater DPPH radical scavenging effect compared to other polysaccharides. The DPPH radical scavenging effect of pectin increased gradually with increasing concentrations of pectin. At two different RP concentrations, 0.01 and 0.1% in ethanol, addition of pectin improved the stability of RP in a concentration dependent manner. The stabilizing effect of pectin on RP was more effective for the lower concentration of RP (0.01%, v/v). Further, degradation of RP was reduced following the addition of pectin as measured over 8 hours. From the results obtained,it can be suggested that pectin may be a promising ingredient for cosmeceutical bases designed to stabilize RP or other pharmacological agents subject to degradation by oxidation.
경주지진과 유사한 특성을 가지는 지반가속도로 가진된 단주기 구조물 변위연성도 평가
노지은,이상현,서준원,김동관,Roh, Ji Eun,Lee, Sang Hyun,Seo, Jun Won,Kim, Dong Kwan 한국지진공학회 2016 한국지진공학회논문집 Vol.20 No.7
In this paper, time and frequency domain characteristics of Gyeong-ju earthquakes were investigated, and nonlinear time history analyses were conducted for bi-linear hysteretic structures excited by short-duration ground accelerations. Previous studies showed that larger inelastic displacements than the peak displacement of the corresponding elastic system were observed especially for the structures with structural period shorter than 0.3s, and the similar results could be obtained when long-duration ground accelerations were used as excitation loads. For the short-duration earthquakes, however, the inelastic displacements were not so large and almost identical to the peak elastic displacements.
다중거동 복합형 감쇠장치를 적용한 철골골조의 내진성능실험
노지은,허석재,이상현 한국지진공학회 2019 한국지진공학회논문집 Vol.23 No.1
In this study, the effectiveness of a multi-action hybrid damper (MHD) composed of lead rubber bearing (LRB) and friction pad was verified in terms of seismic performance improvement of a frame structure. The LRB and the friction elements are connected in series, so the LRB governs the intial small deformation and the friction determines large deformation behavior. Cyclic loading tests were conducted by using a half scale steel frame structure with the MHD, and the results indicated that the structure became to have the stable trilinear hysteresis with large initial stiffness and first yielding due to the LRB, and the second yielding due to the friction. The MHD could significantly increase the energy dissipation capacity of the structure and the hysteresis curves obtained by tests were almost identical to the analytically estimated ones.
노지은 한국여성정책연구원 2018 여성연구 Vol.99 No.4
In the globalization era. menstruation is now at the point of discussing ‘menstruation as human rights’ as a global human rights norm and development agenda. In the global society in the mid-2000s, the menstruation problem was not addressed in the debate on feminism and reproduction rights movement, nor in the goal of sexual and reproductive health and rights in global development, but in the irony of sustainable environmental goals in the issue of water, hygiene and sanitation. The purpose of this study is to analyze the meaning and limitations of menstrual discourse produced by the subjects of menstrual hygiene management through the menstrual hygiene day campaign and research report. It examines how menstrual reality, including the global menstrual taboo and menstruation statistics, in the underdeveloped regions of Asia is represented and how global human rights norms support the menstrual hygiene discourse. This suggests that women’s menstrual experience is extended to the feminist agenda of gender and reproductive rights in order to become a menstrual human right, beyond limiting menstrual problems to hygiene sanitation and health development agendas.
감쇠장치를 사용한 경주지진과 유사한 특성을 가지는 지반가속도로 가진된 단주기구조물 내진성능보강
노지은,이상현,서준원 한국지진공학회 2016 한국지진공학회논문집 Vol.20 No.7
In this study, effectiveness of seismic retrofitting methods using passive damping devices was investigated through numerical analyses of short-period structures under earthquakes which have short-duration and high-frequency impulse characteristics similar to Geyongju earthquakes. Displacement spectra of elastic systems and ductility demand of inelastic systems were evaluated by increasing viscous or friction damping. The damping devices could reduce responses of the structures with shorter structural period than 0.2s. The earthquakes similar to impulse load did not induce the responses of the structures with longer period than 0.4s, and the effects of the damping devices which generates damping forces proportional to structural responses became insignificant.