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Analysis of the Efficiency for Some Selected Double-Block-Length Hash Functions Based on AES/LEA
Kim, Dowon;Kim, Jongsung;
Journal of the Korea Institute of Information Security and Cryptology, vol. 26, iss. 6, 2016, pp. 1353-1360
We analyze the efficiency of the double-block-length hash functions, Abreast-DM, HIROSE, MDC-2, MJH, MJH-Double based on AES or LEA. We use optimized open-source code for AES, and our implemented source code for LEA. As a result, the hash functions based on LEA are generally more efficient than those, based on AES. In terms of speed, the hash function with LEA are 6%~19% faster than those with AES except for Abreast-DM. In terms of memory, the hash functions with LEA has 20~30 times more efficient than those with AES.
The Development of Beam Profiling System for the Analysis of Pulsed Gamma-ray Using the Electron Acc
Hwang, Young-Gwan;Lee, Nam-Ho;
Journal of the Korea Institute of Information and Communication Engineering, vol. 20, iss. 12, 2016, pp. 2410-2416
Recently, most countries in the world have pursued a denuclearization. So it has been of interest to increase to Nuclear weapon in such as North Korea`s continued nuclear test. Pulsed gamma rays produced in the nuclear explosion and the space environment can give the big damage to the electronic device in a very short period of time. To confirm the extent of damage of these electronic devices, pulsed gamma irradiation facility that can occur in nuclear weapon or space environment are required. In this paper, we implemented the pulsed gamma-ray detection module and analyzed output of the irradiation test. We have experimented using an electron beam accelerator research facilities in Pohang Accelerator similar conditions to equip and Nuclear weapon. As a result, we confirmed that the pulsed gamma rays emitted by the gamma radiation and electron beam conversion device. The results of this paper will contribute to improve the reliability and accuracy of studies for utilizing pulsed gamma rays.
The Impact of Satellite Observations on Large-Scale Atmospheric Circulation in the Reanalysis Data:
Park, Mingyu;Choi, Yooseong;Son, Seok-Woo;
Atmosphere, vol. 26, iss. 4, 2016, pp. 523-540
The effects of satellite observations on large-scale atmospheric circulations in the reanalysis data are investigated by comparing the latest Japanese Meteorological Association`s reanalysis data (JRA-55) and its family data, JRA-55 Conventional (JRA-55C). The latter is identical to the former except that satellite observations are excluded during the data assimilation process. Only conventional datasets are assimilated in JRA-55C. A simple comparison revealed a considerable difference in temperature and zonal wind fields in both the stratosphere and troposphere. Such differences are particularly large in the Southern Hemisphere and whole stratosphere where conventional ground-based measurements are limited. The effects of satellite observations on the zonal-mean tropospheric circulations are further examined in terms of the Hadley cell, eddy-driven jet, and mid-latitude storm tracks. In both hemispheres, JRA-55C exhibits slightly weaker and narrower Hadley cell than JRA-55. This is consistent with a weaker diabatic heating in JRA-55C. The eddy-driven jet shows a small difference in its latitudinal location only in the Southern Hemisphere. Likewise, while the Northern-Hemisphere storm tracks are quantitatively similar in the two datasets, Southern-Hemisphere storm tracks are relatively weaker in JRA-55C than in JRA-55. Their difference is comparable to the uncertainty between reanalysis datasets, indicating that satellite data assimilation could yield significant corrections in the zonal-mean circulation in the Southern Hemisphere.
A Proposal of Mentoring Basic Process Model based on DEVS Formalism : Focusing on Mentoring Activiti
Journal of Korea Multimedia Society, vol. 19, iss. 12, 2016, pp. 2024-2035
Modern industry requires people with the ability to create and improve their knowledge. Most educational institutions have used mentoring activities which can train those people. Then each of the institutions has different directions because they work in their own fields. For that reason, many people which want to make new mentoring program have no choice but to go through many trials and errors. This paper deals with the design method of basic process model for mentoring based on DEVS in order that people plan a new mentoring business or make a new mentoring group easily. Our proposed model is expected to be used as a guide to establish procedures for mentoring systems.
A Study on the Production Efficiency of Movie Filming Environment Using 360
Lee, Young-suk;Kim, Jungwhan;
Journal of Korea Multimedia Society, vol. 19, iss. 12, 2016, pp. 2036-2043
Virtual Reality (VR) live-action movies are filmed by attaching multiple cameras to a rig to shoot the images omni-directionally. Especially, for a live-action film that requires a variety of scenes, the director of photography and his staff usually have to operate the rigged cameras directly all around the scene and edit the footage during the post-production stage so that the entire process can incur much time and high cost. However, it will also be possible to acquire high-quality omni-directional images with fewer staff if the camera rig(s) can be controlled remotely to allow more flexible camera walking. Thus, a
VR filming system with remote-controlled camera rig has been proposed in this study. The movie producers will be able to produce the movies that provide greater immersion with this system.
A Study on Multichannel Selection according to Consumer`s Price Sensitivity -Focusing on Fashion Pro
Ahn, Hyun A;Kim, Chi Eun;Lee, Jin Hwa;
Journal of the Korean Society of Clothing and Textiles, vol. 40, iss. 6, 2016, pp. 967-978
This study examines consumers` multi-channel choices in the search phase and purchasing phase stage according to price sensitivity and product characteristics in order to propose a multichannel strategy. For the research, one-way ANOVA, t-test, clustering analysis, and crosstabs are used for the descriptive analysis of 317 surveys on men and women conducted in 2014. The findings are as follows. First, consumers that both experience goods and search goods rely on surrounding advice as well as a search channel regardless of price sensitivity. Second, channel selection differs by price sensitivity when it comes to purchasing phase. Consumers with high price sensitivity tend to purchase from online channels; however, consumers with low price sensitivity tend to purchase from off line channels in cases of search goods. Meanwhile, cases of experience goods have no meaningful result. Third, consumers are divided into 3 groups by the tendency of channel selection. In case of experience goods, search channel choice is aligned with purchasing channel; however, search channel choice is not aligned with purchasing channel in search goods. This study provides clear information on fashion consumers` behavior on multi-channel choices compared to ones for search goods consumers on strategic strategies for fashion companies.
Comparison of Echogram Analysis Methods for Evaluating the Sound-scattering Layer
Choi, Seok-Gwan;Yoon, Eun-A;Han, Inwoo;Oh, Wooseok;
Korean Journal of Fisheries and Aquatic Sciences, vol. 49, iss. 6, 2016, pp. 856-861
This study compared the density of fish determined using three different echogram methods: the frequency-difference, time variable, and threshold modification methods. An acoustic survey was conducted off the coast of Jeju Island after sunset. Data at 38 and 120 kHz frequencies were collected using a commercial fishing vessel. As a reference point, the value of
that distinguished fish from zooplankton using the 38 and 120 kHz frequencies was set at < 2 dB. The estimated density of fish along the survey line was 0.1-30.4, 0.1-64.3, and
using the frequency difference, time variable threshold, and threshold modification methods, respectively. The results of this study constitute basic research for estimating fish densities.
Host Plant Management Techniques for the Cultivation of Viscum album var. coloratum (Kom.) Ohwi
Lee, Bo Duck;Seo, Hyeong Min;Park, Cheol Ho;
Korean Journal of Plant Resources, vol. 29, iss. 6, 2016, pp. 650-657
Research has found that the management of the host plant is essential to mistletoe cultivation. A Trunk injection test on the host plant that contained a mixture of indole-3-butryc acid (IBA) and liquid fertilizer was conducted with respect to the improvement of the one year survival rate of mistletoe. As a result, the trunk injection experiments showed the effect of the IBA and liquid fertilizer mixture in all treatments. This mixture was effective to increase the survival rate of mistletoe by 20% with the IBA at 100 mg/L and Hyponex at 100 mg/L. The examination proved that the host plant fertilizer effect was the most effective treatment for organic fertilizer with 60% added NPK (4-2-1). Its effects were higher compared to the control at the length and diameter of one-years-old branches in the host plant, even when the parasitic mistletoe improved its growth in length, diameter, and number of branches. Comparing the control and host plant fertilizer, the latter was the most effective way to process 20 kg per a treatment effect in the experimental site and to process at any time after the inoculation. This treatment is effective to improve the growth of mistletoe by watering the host plant three times per week. Therefore, the management of the host plant is an essential element in the successful cultivation of mistletoe, not only to supply fertilizer and plant hormones to the host plant in the initial inoculation time but also to provide organic fertilizer and irrigation for the host plant.
High-Efficiency and Low-Complexity Spread Spectrum ALOHA for Machine-to-Machine Communications
Noh, Hong-jun;Park, Hyung-won;Lim, Jae-sung;
The Journal of Korean Institute of Communications and Information Sciences, vol. 41, iss. 12, 2016, pp. 1700-1706
To improve the number of simultaneous transmissions of machine-to-machine traffic in a spread spectrum ALOHA channel, we propose a new spreading technique called doubly truncated cyclic code shift keying (DTCCSK). By truncating the codeset of cyclic code shift keying, DTCCSK freely adjusts the spreading factor and the symbol length. As a result, DTCCSK exhibits both a high spectral efficiency of M-ary signaling and low implementation complexity of a direct sequence.
Selectivity of Tefuryltrione between Rice and Eleocharis kuroguwai
Song, Jong-Seok;Park, Yong Seog;Park, Min-Won;Lee, Jeong Deug;Kim, Do-Soon;
Weed & Turfgrass Science, vol. 5, iss. 4, 2016, pp. 191-195
Tefuryltrione is a new hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor, which has been recently registered for the use for paddy rice, Korea. Dose-response studies were conducted to compare rice safety and weed control efficacy of tefuryltrione against Eleocharis kuroguwai. When rice and E. kuroguwai were applied at a range of doses of tefuryltrione,
values (the dose required to inhibit weed growth by 90%) of E. kuroguwai were
in two independent experiments. The
values (the dose required to inhibit rice growth by 10%) of tefuryltrione for rice were
. As a result, the selectivity indices (
for E. kuroguwai) of tefuryltrione were 3.19-5.72. Therefore, these results demonstrate that tefuryltrione has a relatively high selectivity between rice and E. kuroguwai with a high herbicidal activity against E. kuroguwai and a good rice safety.