• 한국해양학회지
• /
• v.20 no.2
• /
• pp.40-48
• /
• 1985

The depositional conditions and paleo-oceanography of the Hoedongri Formation(Silurian) distributed in the Hoedongri, Jeongseon-Kun, Kangweon-Do, Korea were investigated. The major rock types and facies of the Hoedongri Formation consist of mudstone and wackestone facies in which the content of insoluble residues is relatively high (average. 17%). The sedimentary structures observed in the Hoedongri Formation being helpful to the interpretation of depositional conditions are; crypt-algalaminates, bird's eye structures, evaporite pseudomorphs, dolomite mottle structures, detrital quartz pockets and cross bedding. Based on the rock types, facies and sedimentary structures of the Hoedongri Formation, it seems that the Hoedongri Formation might be deposited in a saline supratidal and intertidal zone.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.28 no.3
• /
• pp.163-169
• /
• 2017

This paper proposed a method of broadband method of dual polarized dipole antenna for 700 MHz band base station. The proposed antenna has a structure that PCB feeder is mounted on the metallic radiator. The design of radiator and feeder is optimized by using 3D EM simulation. The proposed antenna(bandwidth 31.6 %) is broadened over 12.2 % through the lower frequency band than reference antenna(bandwidth 19.4 %), however the size is not increased. Measured results of S-parameters, radiation patterns, and gain have a good agreement with simulation ones.

• Convergence Security Journal
• /
• v.15 no.2
• /
• pp.81-89
• /
• 2015

HIGHT is an 64-bit block cipher, which is suitable for low power and ultra-light implementation that are used in the network that needs the consideration of security aspects. This paper presents a key scheduler that employs the presented LFSR and reverse LFSR that can generate four outputs simultaneously. In addition, we construct new key scheduler that generates 4 subkey bytes at a clock since each round block requires 4 subkey bytes at a time. Thus, the entire HIGHT processor can be controlled by single system clock with regular control mechanism. We synthesize the HIGHT processor using the VHDL. From the synthesis results, the logic size of the presented key scheduler can be reduced as 9% compared to the counterpart that is employed in the conventional HIGHT processor.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.16 no.3 s.94
• /
• pp.260-269
• /
• 2005

In this paper, we propose a microstrip line fed printed monopole antenna which has an ultra-wideband characteristic. Proposed antenna can improve the bandwidth characteristic with the taper structure formed by modified ground plane and radiating element. Measured impedance bandwidth ratio of the antenna is more than 30:1; from the lower frequency of 0.89 GHz to the upper frequency of more than 30 GHz for VSRW$\leq$2. The antenna has conical radiation pattern that has low radiation gain to $\theta$=0$^{\circ}$ direction and higher radiation gains as $\theta$ increases.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
• /
• v.10 no.1
• /
• pp.32-43
• /
• 1999

In this paper, the transformed QMSA to load a capacitor without limitation of the electric force on QMSA(Quarter-wavelength Microstrip Antenna) is designed. Bandwidth of the designed and manufactured antenna is 5.7% at the resonant frequency of 2.0 GHz and the resonant frequency and bandwidth versus change of any arbitrary feed point is observed. Since the size of wide slot width between the left and right parallel plate to load a capacitor is very wide bandwidth, will be suitable for very wide bandwidth communication. The radiation pattern characteristics of the designed antenna based on the dipole structure and the aperture structure analysis method. As calculation results, relative backward radation is - 5 dB.

• Fire Science and Engineering
• /
• v.25 no.5
• /
• pp.32-38
• /
• 2011

Amphibious possible, and good fuel economy, so as leisure and transport has increased the use of hovercraft. Fire started in Korea, the prevalence is increasing in demand as the trend has been increasing steadily. In this paper, the hovercraft's forward and backward direction can be controlled in order to free the reverse bucket control system was developed. Control due to development by promoting the flow of air and turn right, turn left and easy to reverse the life-saving and stable at high speed, etc. has made possible the operation of hovercraft. The controller for the stability and fast response Fuzzy-PID method was used. To prove the validity of the proposed controller in Matlab simulation and the actual delivery at the firehouse, built into a model for the demonstration test was performed.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.12 no.4
• /
• pp.1-6
• /
• 2012

We suggested a microwave sensor structure and fabricated experimentally to detect particular particles in the air which are difficult to detect using conventional UWB sensors because their reaction frequencies to electromagnetic waves are too high. In the experiment to detect water particles in the air with up-conversion frequency of 10GHz, we verified detect signal amplitude variation of 75% depending on presence or absence of water particles. The suggested structure can be useful to detect particular materials at the high frequencies more than a few 10th GHz, because the same method can be applied to detect other materials.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2011.05a
• /
• pp.343-347
• /
• 2011

하천 내 설치하는 수제는 제방보호 및 유로변경의 목적으로 하천내 시공되는 구조물 중의 하나로서 하천복원과정에 있어 필수불가결한 구조물 중의 하나로 인식되고 있다. 수제는 대개 하나 이상의 일련의 군집형태로 수로 자체의 특성을 고려하여 설치가 되고 있다. 그러나 이러한 수제의 무분별한 설치는 주변 경관을 저해하는 요소로 나타날 수 있을 뿐만 아니라 시공에 따른 비용에 적지 않은 부담을 야기 시키기 충분하다.본 실험에서는 하향수제($\theta=135^{\circ}$)를 대상으로 수제간격에 대한 이동상 실험을 수행하여 수제주변 및 수제역 내에서 발생하는 하상변동특성을 검토하고자 하였다. 실험은 폭 1.2m, 길이 50m, 높이 1.5m 인 직선수로에서 수로폭의 15%길이를 갖는 하향수제($\theta=135^{\circ}$) 2개를 대상으로 각각 수제길이의 2~ 8배의 간격 조절을 통해 하상변동실험을 수행 하였다. 실험용입자는 중간입경($d_{50}$)이 0.15mm 인 모래를 사용하였으며 6시간 동안 통수하였다. 실험 결과 수제의 간격이 4배 미만으로 설치되었을 때 전면부 수제에서 발생하는 세굴의 영향이 후면부 수제 설치지점에 연장되어 나타나는 것이 확인 되었으며 수제간격이 7배 일 경우 전면부 수제에서 발생하는 최대세굴과 같은 세굴심이 관측되었다. 또한 수제간격이 4배이상으로 설치될 경우 후면부 수제에서 독립적인 세굴이 발생하고 있었는데 이는 직각수제 세굴과 동일한 현상으로 나타났다.

• Journal of the Computational Structural Engineering Institute of Korea
• /
• v.14 no.3
• /
• pp.401-411
• /
• 2001

This paper deals with the vibration analysis of the rectangular plates which are subjected to uniform in-plane stresses and supported on In-homogeneous Pasternak foundation. Two parametric foundation which Winkler foundation parameter and shear foundation parameter considered, is called by the Pasternak foundation. The values of Winkler foundation parameter of central and border zone of plate are chosen as k₁and k₂respectively, and the value of shear foundation is chosen as constant about all zone of plate. After composing global flexural stiffeness matrix, geometrical stiffeness matrix, mass matrix, and the stiffeness matrix of the Pasternak foundation, eigenvalue problems which are composed of these matrices are solved. The result shows that the shear foundation parameter must not be ignore when considering the stiffeness of foundation.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.10 no.2
• /
• pp.386-391
• /
• 2006

In this paper, a design of V-type Linearly Tapered Slot Antenna(V-LTSA) with uniplanar microstrip-to-coplanar stripline(CPS) transitions is presented. The effect of reducing and increasing with taper width G, teper length L and opening angle are also considered at 5.8 GHz. In the result of a simulation by using CST-MWS, the return loss characteristic came very wide band about 4.3GHz, or 1.8 Octave. Proposed V-LTSA design schemes are expected to be a good antenna for microwave and millimeter-wave communcations.