• Journal of Korea Multimedia Society
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• v.10 no.3
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• pp.316-324
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• 2007

Maximum Intensity Projection (MIP) identifies patients' anatomical structures from MR or CT data sets. Recently, it becomes possible to generate MIP images with interactive speed by exploiting Graphics Processing Unit (GPU) even in large volume data sets. Generally, volume boundary plane is obliquely crossed with view-aligned texture plane in hardware-texture based volume rendering. Since the ray sampling distance is not increased at volume boundary in volume rendering, the aliasing problem occurs due to data loss. In this paper, we propose an efficient method to overcome this problem by Re-rendering volume boundary planes. Our method improves image quality to make dense distances between samples near volume boundary which is a high frequency area. Since it is only 6 clipping planes are additionally needed for Re-rendering, high quality rendering can be performed without sacrificing computational efficiency. Furthermore, our method couldbe applied to Minimum Intensity Projection (MinIP) volume rendering.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.2 no.1
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• pp.27-35
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• 1998

In this paper, we propose a novel spectral-chopping model of Class-II$(1+D)^2$ -PRS system which reveals improved spectral efficiency. We build up the model having spectrum chopped by the amount of Nyquist over-rate, and then compare its characteristics with the conventional model in both the time-domain and the frequency-domain. When the transmission system operates above the Nyquist rate, the new model has better performance than the conventional PRS using its inherent speed-tolerance. According to our investigations, Class-II PRS shows more excellent effect in the spectral-chopping method than Class- I and W types analyzed previously. We ascertain that the over-rate of 26.675 obtained by the inherent speed-tolerance could be improved upto 40% using spectrum-truncation. These effects come from the fact that the raised-cosine spectrum of Class-II PRS has smaller Boss of frequency component and energy than any other types for the same amount of truncation. In order to validate these theoretical results, we present their sidelobe-trends confirming cancellation effects at the sampling instants and some experimental results showing their patterns of eye-openings and spectra.

• The Korean Journal of Applied Statistics
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• v.32 no.4
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• pp.503-515
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• 2019

In this study we estimate the survival function of duration of the legislative processes in the 17th, 18th, and 19th National Assembly of Korea, and further analyze effects of the political situation variables on the legislative process. We define the termination of legislative process from a novel perspective to alleviate issues of dependency between censoring and failure in the data. We also show that the proportional hazards assumption does not hold for the data, and analyze data employing a log-normal accelerated failure time model. The policy areas of law agendas are shown to affect the speed of legislative process in different ways and legislative process tends to be prompt in times of divided governments.

• Korean Journal of Weed Science
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• v.8 no.2
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• pp.187-198
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• 1988

The second leaves from 30 days old seedlings of two rice cultivars which were selected as tolerant (cv. Chokoto) and susceptible (cv. Weld pally) cultivar were soaked in the concentration of $10^{-6}$, $10^{-5}$, $10^{-4}$ and $10^{-3}M$ of oxyfluorfen for 10, 15 and 22hrs and anatomical characteristics were abserved. Dipping to the solutions were carried out either directly to the attached leaves or to the seperated leaves. Development of any symptoms in epidermis, bundle sheath, mesophyll cells and bulliform cells were microscopically inspected. Both cultivars showed reductionin leaf thickness, but the susceptible ones was more sensitive than the tolerant. The degradation and disappearance of epidermal cell layer, breakage of bundle sheath cells, shrinkage of mesophyll cells and disappearance of bulliform cells were general response as affected by oxyfluorfen treatment. The susceptible cultivars showed such responses at the concentration of $10^{-5}M$ for 10 hrs while tolerant ones $10^{-3}M$, for 10 hrs. Those treatments were more effective in seperated leaves than in attached ones. The epicuticular wax layer of leaves treated as above for 20 hrs was inspected by SEM. Weld pally, the susceptible cultivar (Weld pally) showed rapid cleavage of wax layer under $10^{-5}M$ concentration while the tolerant (Chokoto) showed only minor damage on wax layer at the concentration of $10^{-3}M$.

• Polymer(Korea)
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• v.33 no.5
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• pp.501-508
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• 2009

The thermal degradation experiment of sodium salt of poly (${\gamma}$-glutamic acid) (PGGNa) has been carried out in both its solid phase and solution phase at the range of $57{\sim}120^{\circ}C$ and their molecular weight decreasing effect was analyzed as a function of time by means of viscometry and light scattering. Based on the solid phase degradation results, it was supposed that the bond scission rate in a polymer chain kept constant and that the bond scission was occurred on a randomly located position in a polymer chain. For the degradation in solution phase, it was also found that all data at various temperatures were dropped on a single master curve when the reduced time $t/t^*$ was used in the plot of the reciprocal intrinsic viscosity (or molecular weight). This degradation curve in solution phase could be expressed as the sum of a single exponential and a linear equation and especially, the single exponential character appeared only at the beginning stage. The activation energy was measured as $107{\sim}115$ kJ/mol in this study and agreed with the literature values.

• Proceedings of the Korean Society of Computer Information Conference
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• 2020.01a
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• pp.129-130
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• 2020

공중장소에서 충전기에 꽂힌 상태로 무방비로 도난의 위협에 방치되어있는 스마트폰들을 아주 쉽게 발견할 수 있다. 잃어버린 스마트폰은 다시 구매하면 되지만 혹시라도 미처 백업하지 못한 자료나 연락처 등의 소중한 정보의 손실로 인해 피해는 클 것이다. 공중장소에서 충전중인 스마트폰을 절도를 목적으로 무단으로 전원에서 분리할 가능성에 대비하여 경고화면을 보여주는 한편, 만일 무단으로 충전기에서 뽑거나 케이블을 절단하면 경보를 울리는 한편, 현재 위치의 위도와 경도를 SMS기능을 사용해 지정한 전화번호로 해당 정보를 전송하는 기능을 안드로이드에 구현하였다. 이를 통해 도난이 되더라도 스마트폰을 잃어버린 위치와 시간을 특정 할 수 있게 도와 줄 수 있기 때문에, 도난이 의심되는 해당 시설 또는 근처의 CCTV영상을 확보하여 범인을 빨리 특정할 수 있게 함으로써 최대한 빠르게 스마트폰을 되찾을 수 있는 확률을 높여주고, 스마트폰에 대한 절도억제 효과도 줄 수 있다.

• Korean Journal of Food Science and Technology
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• v.17 no.5
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• pp.345-349
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• 1985

The textural properties of acorn flour gels were investigated with the variations in the concentraction, storage time and storage temperature by the use of Instron Universal Testing Machine. The experimental design was $3^3$ factorial experiment. TPA curves of acorn flour gels showed two sharp peaks in the first bite and no negative peak. The hardness and brittleness of acorn flour gels were very significantly affected by concentration, storage time and storage temperature. For the height difference between first peak and second peals, the main effects for concentration and storage temperature were very significant and the main effect for storage time was not negligible. For bend, the effect of concentration was more significant than the effect of storage temperature, and storage time effect was negligible. Springiness was affected only by the concentration.

• Parasites, Hosts and Diseases
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• v.31 no.2
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• pp.135-140
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• 1993

An experimental study was performed to observe the infectivlty of sparganum (plerocercold of Spirometra erinncel) treated by prazlquantel, gamma-irradiation and mechanical cutting. The spargana were obtained from the naturally Infected European grass snake, Rhabdophis tigrina, or from the expenmentally infected mice. A total of 83 mice (ICR straine were divided Into 3 experimental groups by the source of the damage, fed each UH 5 spargana, and sacnaced 1 month later for worm recovery. In the praziquantel group, the worms were incubated In the concentration of 10㎍/ml (control: Tyrode for 4 hours) for 0.5. 1.2 and 4 hours at 36℃. and fed to mice. The recovery rate from mice in prazlquantel group was not different from that (80%) of control poop and in the range of 76-100%. In the gamma-Irradiation group, the worms were irradiated by 10-1000 Gy with Csl37. The average recovery rates of 69-100% were not different from that of control up to 100 Gy. The rate was 56% under 150 Gy, and 5% by 1000 Gy. In the mechanical cutting group, the worms were cut at 0.5, 1, 2 and 3 m from the anterior end of the scolex. The average recovery rates In each group were 70-90% and that of control was 90%. The present folding suggests that the sparganum be highly resistant to prazlquantel, gamma- irradiation and mechanical cutting. The vitality center of the sparganum must be at the anterior end of Its scolex.

• Korean journal of food and cookery science
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• v.3 no.1
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• pp.64-70
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• 1987

The effects of salting on the compositional and textural changes of Korean cabbage were studied. The optimum brining conditions were established ana the dietary fiber composition, mineral contents and moisture content of raw and salted Korean cabbage were determined. The cutting test of cabbage was made by Rheometer and the brittleness and chewiness were evaluated organoleptically. The optimum condition for brining was at 20% NaCl concentration for 6 hours. In the compositional changes of Korean cabbage by salting at 20% NaCl solution for one month, the content of hot water soluble pectin (HW-P) increased from 43.6% to 55.9% and that of hexametaphosphate soluble pectin (HM-P) decreased from 35.9% to 29.5%. The contents of cellulose and hemicellulose increased, but that of lignin decreased slightly by salting, showing no significant differences in raw and salted cabbage. The content of Na increased significantly and those of Ca, Mg and K decreased by salting. And also moisture content decreased from 91% to 79%. In the textural changes of Korean cabbage by salting, the maximum cutting force and cutting work increased five times and two and half times respectively. And organoleptic test did show significant increase in chewiness and decrease in brittleness. The maximum cutting force by Rheometer was well correlated with the sensory parameters. The results taken together showed that the changes in textural properties during salting are relevant to the changes in pectic substances, moisture content and mineral contents, but relatively irrelevant to the changes in cellulose, hemi-cellulose ana lignin. And it is considered that the maximum cutting force by cutting test is good means for the expression of texture of Korean cabbage.

• Journal of the East Asian Society of Dietary Life
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• v.25 no.5
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• pp.887-892
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• 2015

Jerusalem artichoke is often stored poorly after harvesting due to its delicate skin. For this reason, Jerusalem artichoke is mainly distributed in the market as a dried material. In order to improve utilization of dried Jerusalem artichoke, we made Jangachi and analyzed physiochemical characteristics with raw Jerusalem artichoke Jangachi during storage. Raw Jerusalem artichoke was sliced into 7 and 10 mm slices and dried in hot air. After aging, we analyzed rehydration capacity, pH, hardness, salinity, sugar content, and fructan content of both. Dried Jerusalem artichoke sliced into 10 mm slices took over twice as long (420 min) to be rehydrated over 90% than 7 mm sliced (200 min) Jerusalem artichoke. In the case of raw Jerusalem artichoke, hardness showed a tendency to decline. Relatively, hardness of dried Jerusalem artichoke was measured consistently. After 4 weeks, salinity and sugar content were 3.63% and $41.23^{\circ}Brix$ in raw Jerusalem artichoke Jangachi, 3.47% and $37.05^{\circ}Brix$ in 7 mm dried Jerusalem artichoke, and 3.77% and $39.15^{\circ}Brix$ in 10 mm dried sample, respectively. As a result of this study, the possibility of dried Jerusalem artichoke as a pickle was confirmed.