• Macromolecular Research
• /
• 제12권5호
• /
• pp.431-436
• /
• 2004

Cross-linked network solid polymer electrolytes were prepared by means of in situ hydrosilylation between poly[hydromethylslioxane-g-oligo(ethylene oxide)] and diallyl or triallyl group-containing poly(ethylene glycols). The conductivities of the resulting polymer electrolytes were greatly enhanced upon the addition of poly(ethylene glycol) dimethyl ether (PEGDME) as an ion-conducting plasticizer. Conductivities of the cross-linked polymer electrolytes were more dependent on the molecular weight of PEGDME than on the cross-linkers. The maximum conductivity was found to be 5.6${\times}$10$\^$-4/ S/cm at 30$^{\circ}C$ for the sample containing 75 wt% of PEGDME (M$\_$n/ =400). These electrolytes exhibited electrochemical stability up to 4.5 V against the lithium reference electrode. We observed reversible electrochemical plating/stripping of lithium on the nickel electrode.

• 한국생산제조학회지
• /
• 제23권5호
• /
• pp.525-531
• /
• 2014

A cowl cross is a part of the car's instrument panel used to maintain the rigidity of the vehicle body side. The application of laser welding has the benefits of speed and thermal deformation compared to arc welding. An ultra-high strength steel sheet is used to reduce the weight of the vehicle body parts. Generally, formability of such a steel sheet is poor because its elongation is very low. For this reason, a method for cold forming of an ultra-high strength steel sheet is required. This paper describes how to improve the formability and weldability of the ultra-high strength steel sheet. Mechanical tests of this material were also performed to evaluate the welding properties of $CO_2$ (GMAW) and those of laser welding.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2003년도 추계학술대회논문집
• /
• pp.136-137
• /
• 2003

Recrystallization textures of ferritic stainless steel sheets of STS 430, the crystallographic texture was modified by means of cross rolling and subsequent annealing. The conventional normal rolling led to the formation of ｛334｝＜483＞ in the final recrystallization texture. Cross rolling in the present work was performed by a 45$^{\circ}$rotation of RD around ND. After recrystallization annealing the cross-rolled samples displayed stronger｛111｝//ND orientations. The cross rolled sample displayed a higher resistance against ridging.

• 한국소성가공학회:학술대회논문집
• /
• 한국소성가공학회 2001년도 추계학술대회 논문집
• /
• pp.309-312
• /
• 2001

FEM simulating system of the cross-rolling texture formation offers a systematic and efficient way of exploring the relationship between the process variables and the state of plastic anisotropy of sheet product. Cross-rolled sheets possess higher average plastic strain ratios and lower planer anisotropy than those of the straight-rolled sheets. The employed model is a finite-element polycrystal model which each element used in FEM is assumed to be a crystal having different orientation by Takahashi. Texture development, deformation textures due to cross-rolling are predicted for face-centered cubic sheet metal. Crystal orientations are assigned on the basis of the pole figures obtained by X-ray diffraction. Development of anisotropy during cross rolling of an fcc sheet material is predicted theoretically with respected to flow stress and R-value in tensile test.

• 한국군사과학기술학회지
• /
• 제19권5호
• /
• pp.598-605
• /
• 2016

One of the effective methods for angular deception against monopulse radar is a cross eye technique. The typical cross eye technique can cause significant angular errors to monopulse radar by using two transceivers which transmit the signals with opposite phases. However, typical cross eye systems have high complexity of implementation because two transceivers should be installed with enough distance on the platform. In this paper, we propose a new cross eye technique with single transceiver based on the multipath effect. Then, angular deception performance of the proposed technique is analyzed.

• 한국군사과학기술학회지
• /
• 제10권3호
• /
• pp.16-24
• /
• 2007

The high-frequency analysis method of back-scattering cross section spectrum of rotating targets is established. The time history of the back-scattering cross section is calculated using a quasi-stationary approach, based on a physical optics and a physical theory of diffraction, combining an adaptive triangular beam method to consider the shadow effect. And the spectra of back-scattering cross section by the Doppler effect are analyzed applying a simple fast Fourier transform method to its time history. The numerical calculation for rotating targets, such as rotating metal plates and underwater propeller, are carried out. The time history appears to be periodic with respect to the number of wings. The backscattering cross section spectrum level and its frequency shift are dependent on the rotating speed, direction, and the shape of the targets.

• 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
• /
• 한국정보과학회언어공학연구회 2020년도 제32회 한글 및 한국어 정보처리 학술대회
• /
• pp.377-382
• /
• 2020

cross-texting은 실수로 의도하지 않은 상대방에게 메세지를 잘못 전송하는 것을 말한다. 휴대폰 메신저 사용이 활발해짐에 따라 이 같은 실수가 빈번하게 발생하는데 메신저에서 제공하는 기능은 대체로 사후 해결책에 해당하고 사용자가 사전에 실수를 발견하기는 어렵다. 본 논문에서는 사용자가 작성한 문장의 형식적 자질를 분석하여 현재 참여중인 대화에서 작성한 문장이 cross-texting인지를 판별하는 모델을 제안했다. 문장에서 높임법, 표층적 완성도 자질을 추출하고 이를 통해 특정 사용자의 대화를 모델링하여 주어진 문장이 대화에 부합하는지 여부를 판단한다. 이같은 방식은 채팅방의 이전 기록만으로도 사용자가 작성한 문장이 cross-texting인지 여부를 쉽게 판단할 수 있는 힌트를 제공할 수 있다. 실제 메신저 대화 말뭉치를 이용해 제작한 데이터에서 94% 정확도로 cross-texting을 탐지했다.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• 제12권4호
• /
• pp.324-328
• /
• 2012

With the recent advances in information retrieval, cross-media retrieval has been attracting lot of attention, but several issues remain problems such as constructing effective correlations, calculating similarity between different kinds of media objects. To gain better cross-media retrieval performance, it is crucial to mine the semantic correlations among the heterogeneous multimedia data. This paper introduces a new method for cross-media retrieval which uses ontology to organize different media objects. The experiment results show that the proposed method is effective in cross-media retrieval.

• International Journal of Fluid Machinery and Systems
• /
• 제9권2호
• /
• pp.169-174
• /
• 2016

A cross-flow wind turbine has a high torque coefficient at a low tip speed ratio. Therefore, it is a good candidate for use as a self-starting turbine. Furthermore, it has low noise and excellent stability; therefore, it has attracted attention from the viewpoint of applications as a small wind turbine for an urban district. However, its maximum power coefficient is extremely low (10 %) as compared to that of other small wind turbines. In order to improve the performance and flow condition of the cross-flow rotor, the symmetrical casing with a nozzle and a diffuser are proposed and the experimental research with the symmetrical casing is conducted. The maximum power coefficient is obtained as $C_{pmax}=0.17$ in the case with the casing and $C_{pmax}=0.098$ in the case without the casing. In the present study, the power characteristics of the cross-flow rotor and those of the symmetrical casing with the nozzle and diffuser are investigated. Then, the performance and internal flow patterns of the cross-flow wind turbine with the symmetrical casings are clarified. After that, the effect of the side boards set on the symmetrical casing is discussed on the basis of the analysis results.

• 한국식품과학회지
• /
• 제24권1호
• /
• pp.70-73
• /
• 1992

옥수수 전분을 하이드록시프로필화 및 가교화시켜 변성 전분을 제조한 후 DSC, Amylograph 등을 이용하여 호화특성을 연구하고 호화액의 gel 특성을 조사하였다. 하이드록시프로필화에 의하여 옥수수 전분의 호화온도는 크게 떨어졌으며 가교화만을 시킨 전분은 호화온도가 약간 상승하였으며 호화엔탈피는 약간 감소하였다. 하이드록시프로필화와 가교화를 동시에 시켰을 때는 호화온도가 크게 떨어져 하이드록시프로필화만 시킨 것보다는 약간 높았으나 팽윤이 억제되었고 gel 조직강도는 증가하였다.