• 한국주거학회:학술대회논문집
• /
• 한국주거학회 2011년도 춘계학술발표대회 논문집
• /
• pp.290-295
• /
• 2011

The purpose of this paper was to study on the attitudes about Reverse-Mortgage among Baby Boomers to offer the basis for revitalization of Reverse-Mortgage. Social survey research using a questionnaire was conducted among the babyboomer's living in Seoul area from September $30^{th}$ to October $14^{th}$. The data from 102 respondents were analyzed using SPSS PASW 18.0. The main findings were as followings 1) although 64% of the respondents prefered to type which could withdraw temporary cash, but main factor that affected the use was a stability in one's old age 2) 72% of respondents thought adequate age for application was over 66. So lowering the qualification of age looked not need for revitalization 3) babyboomer's said that they would use reverse-mortgage if they couldn't get benefit from other pension inspite of getting lower recognition on house inheritance. It was be cause they regarded Reverse-Mortgage as a final step. In conclusion, current qualification and limit for withdraw looks adequate but it need public relations about its merit unlike other pension. And it has to emphasize its stability so that baby boomer can feel easy from holding a mortgage on their house.

• 한국소음진동공학회논문집
• /
• 제16권11호
• /
• pp.1124-1131
• /
• 2006

This paper presents a novel method to determine sound power level(PWL) emitted by a travelling vehicle for road traffic noise simulation. The PWL is evaluated by the equivalent sound pressure level (SPL) measured by close proximity method and the sound power correction factor derived from the maximum SPL measured by pass-by method and the propagation attenuation of vehicle noise during the pass-by measurement. Using the method, we derive the empirical formula for PWL estimation in 1/1-octave and overall frequency bands for 8 vehicles (automobile, SUV, small truck, large bus, trailer, 3 dump trucks) tested at two road surfaces (dense graded asphalt, 30mm transverse tinning concrete) of Korean highway test road. The suggested approach, if securing sufficient data to represent the acoustic characteristics of all vehicle types, has il strong merit to be able to evaluate sound power levels for any combination of vehicle categories and traffic volumes.

• 한국멀티미디어학회논문지
• /
• 제7권10호
• /
• pp.1370-1377
• /
• 2004

동일한 장면을 다양한 조건에서 촬영한 영상이나 비디오는 서로 다른 색감을 가지며 촬영 조건에서 중요한 역할을 하는 것은 현장의 조명이다. 조명의 색온도에 따라 전체적인 색감이 결정되므로 조명색의 변환방법이 필요하다. 본 논문에서는 임의로 지정된 색온도로의 조명색 변환 방법을 제안한다. 기존의 조명색 변환 방법은 미리 정해진 일정한 개수의 대표성이 있는 색온도에 대한 변환 관계를 미리 계산하여 두었다가 활용하는 정도이다. 제안한 방법은 임의로 지정한 기준과 목표로 하는 색온도에 대한 변환 관계를 직접적으로 구하여 적용할 수 있는 장점이 있다.

• 대한의생명과학회지
• /
• 제17권3호
• /
• pp.225-230
• /
• 2011

Indirubin is the active ingredient of Danggui Longhui Wan, a mixture of plants that is used in traditional Chinese medicine to treat chronic diseases. In this study we investigated the anti-inflammatory effects of an indirubin derivative, indirubin-3’-monoxime-5-sulphonic acid (I3M-5S, $C_{16}H_{11}N_3O_5S$). We found that I3M-5S inhibits the production of various inflammatory mediators such as nitric oxide (NO) and prostaglandin $E_2$ ($PGE_2$) as well as inflammatory cytokines, tumor necrosis factor-${\alpha}$ and interleukin-6 in lipopolysaccharide (LPS) stimulated murine macrophage, RAW264.7 cells. In addition, the expression of inducible nitric oxide synthase and cyclooxygenase-2, which are essential enzymes to produce NO and $PGE_2$, respectively, was blocked by I3M-5S treatment in LPS-stimulated RAW264.7 cells. Present data suggest that I3M-5S exhibits potent anti-inflammatory activity in cultured macrophages and merit further study as potential therapeutic agents for inflammatory disorders.

• 한국수산과학회지
• /
• 제47권3호
• /
• pp.302-312
• /
• 2014

This article describes the design and performance characteristics of a broadband ultrasonic mosaic transducer. We focus on the improved bandwidth in the high frequency band of a previously designed broadband ultrasonic transducer (Lee et al., 2014). The improvement in the pulse-echo bandwidth was achieved by employing twelve $2{\times}2$ element subarrays, operating at different resonance frequencies, and utilizing the mosaic array concept. We found that the -6 dB and -12 dB bandwidths of the newly developed broadband ultrasonic mosaic transducer, were up to 155% and 170% of the previously designed model, with a quality factor of 1.71 and 1.25, respectively. The averaged TVR (transmitting voltage response), SRT (receiving sensitivity), and FOM (figure of merit) values in a nearly flat transmitting response band, from 45 to 105 kHz providing a -12 dB bandwith of 60 kHz, were 163.3 dB (re $1{\mu}Pa/V$ at 1 m), -192.8 dB (re $1V/{\mu}Pa$), and -30.9 dB, respectively.

• Journal of information and communication convergence engineering
• /
• 제12권1호
• /
• pp.33-38
• /
• 2014

This paper investigates the shaping operation problem introduced by Callahan et al., namely the k-fragility maximization problem (k-FMP), whose goal is to find a subset of personals within a terrorist group such that the regeneration capability of the residual group without the personals is minimized. To improve the impact of the shaping operation, the degree centrality of the residual graph needs to be maximized. In this paper, we propose a new greedy algorithm for k-FMP. We discover some interesting discrete properties and use this to design a more thorough greedy algorithm for k-FMP. Our simulation result shows that the proposed algorithm outperforms Callahan et al.'s algorithm in terms of maximizing degree centrality. While our algorithm incurs higher running time (factor of k), given that the applications of the problem is expected to allow sufficient amount of time for thorough computation and k is expected to be much smaller than the size of input graph in reality, our algorithm has a better merit in practice.

• 마이크로전자및패키징학회지
• /
• 제20권2호
• /
• pp.11-15
• /
• 2013

The wafer bonding process becomes a flexible approach to material and device integration. The bonding strength in 3-dimensional process is crucial factor in various interface bonding process such as silicon to silicon, silicon to metals such as oxides to adhesive intermediates. A measurement method of bonding strength was proposed by utilizing AFM applied CNT probe tip which indicated the relative simplicity in preparation of sample and to have merit capable to measure regardless type of films. Also, New Tool was utilized to measure of tip radius. The cleaned $SiO_2$-Si bonding strength of SPFM indicated 0.089 $J/m^2$, and the cleaning result by RCA 1($NH_4OH:H_2O:H_2O_2$) measured 0.044 $J/m^2$, indicated negligible tolerance which verified the possibility capable to measure accurate bonding strength. And it could be confirmed the effective bonding is possible through SPFM cleaning.

• 대한전기학회논문지:전력기술부문A
• /
• 제50권6호
• /
• pp.265-274
• /
• 2001

Recently, the operation of power systems has become more difficult because the peak demand load is increasing continuously and the daily load factor is getting worse and worse. Also, the consideration of deregulation and global environment in electric power industry is required. In order to overcome those problems, a study on the planning and operation in power systems of dispersed generating sources such as fuel cell systems, photovoltaic systems and wind power systems, has been performed energetically. This paper presents a method for determining an optimal operation strategy of dispersed co-generating sources, especially fuel cell generation systems, considering thermal supply as well as electric power supply. In other words, the optimal operation of those sources can be determined easily by the principle of equal incremental fuel cost and the thermal merit of those sources can be also evaluated quantitatively through Kuhn-Tucker's optimal conditions. In additions, an priority method using the comparison of total cost at the peak load time interval is presented in order ot select the optimal locations of those sources. The validity of the proposed algorithms is demonstrated using a model system.

• 한국전기전자재료학회논문지
• /
• 제17권8호
• /
• pp.852-858
• /
• 2004

An alkoxide-based sol-gel method was used to fabricate $Ba_{0.6}Sr_{0.4}TiO_{3}$thin films doped by Bi from 5 to 20 mol% on a Pt/Ti/$SiO_2$/Sisubstrate. The structural and dielectric properties of BST thin films were investigated as a function of Bi dopant concentration. The dielectric properties of the Bi doped BST films were strongly dependent on the Bi contents. The dielectric constant and dielectric loss of the films decreased with increasing Bi content. However, the leakage current density of the 10 mol% Bi doped $Ba_{0.6}Sr_{0.4}TiO_{3}$ thin film showed the lowest value of 5.13$\times 10^{-7} A/{cm}^2$ at 5 V. The figure of merit (FOM) reached a maximum value of 32.42 at a 10 mol% Bi doped $Ba_{0.6}Sr_{0.4}TiO_{3}$thin films. The dielectric constant, loss factor, and tunability of the 10 mol% Bi doped $Ba_{0.6}Sr_{0.4}Tio_{3}$ thin films were 333, 0.0095, and 31.1%, respectively.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.2
• /
• pp.623-626
• /
• 2004

[ $Ba_{0.6}Sr_{0.4}TiO_3$ ] (BST) dielectric thin films doped by Cr were prepared using an alkoxide-based sol-gel method on the Pt/Ti/SiO2/Si substrate. Atomic force microscopy and x-ray diffraction analysis showed that increasing the Cr doping ratio causes increased grain size while the surface remains smooth and crack-free. It was also found that compared with undoped films the increase of Cr content in BST improves the dielectric constant and the leakage-current characteristics. The figure of merit reached the maximum value of 72.3 at the 5 mol % of Cr doping. This composition showed the dielectric constant of 426, the loss factor of 0.0065, tenability of 47.7%, and leakage-current density (at the electric field of 100 kV/cm) of $5.31{\times}10^{-8}A/cm^2$. The results show that the Cr-doped BST thin films are prospective candidates for applications in tunable devices.