LILI-128 암호의 고속화 방안 및 FPGA 구현에 관한 연구

이훈재,박영민,류명춘 경운대학교 산업기술연구소 2001 産業技術硏究論文誌 Vol.3 No.2(A)

Because LILI-128 cipher is a clock-controlled keystream generator, it makes the keystream data degrade in a speed for clock-synchronized hardware logic design: The clock-controlled LFSR_d in LILI-128 cipher requires 1∼4 times higher system clock, that is the reason why the system throughput in data rate is lower if the same clock were selected and that is the structural problem in principle. In this paper, we propose the solution to 4-bit parallel LFSR_d that each register bit has four variable data routines to feedback or shift in LFSR_d. Finally, we simulates the timing of the design on Max+plus Ⅱ of ALTERA Co., implements the logic circuit to the FPGA device (EPF10K20RC240-3), and analyses the stability on throughput to 50 Mbps rate (we choose a higher speed than T3 rate, 45 Mbps and the maximum delay routine in our design is below 20ns) under the 50㎒ system clock. For example, Lucent technologies ASIC can achieve the throughput about 500 Mbps if the maximum delay routine were 1.8㎱ at a 0.13 ㎛ semiconductor.

A Study on the Habitat Use of the Released Red Fox for Daytime

Seung-Hoon Chae,Dae-Ho Jung,Dong-Ju Song,Seok-Beom Kim,Woo-Jin Jeong,Seung-Jun Jeong,Jin-Seok An,Min Kim,Park Yung Chul 강원대학교 산림과학연구소 2017 강원대학교 산림과학연구소 학술대회 Vol.2017 No.11

The fox (Vulpes vulpes Linnaeus, 1758) are an animal belonging to Genus Vulpes, Family Canidae, Order Carnivora. In Korea, the fox are currently in danger of extinction. To prevent extinction from 2011, a restoration project has been carried out centered around Sobaeksan National Park. The most important factor in the successful fox restoration project is the habitat environment of the target species. This study was conducted to be utilized as the data for collecting more data and selecting suitable releasing sites to analyze the environment of the fox released in 2017. A field survey was conducted using the daily coordinates that the fox stayed in the same place for more than 5 days out of the coordinates collected through CDMA attached to the fox during releasing. In the survey area, the daytime habitat environment of released foxes was identified through a site investigation of altitude, slope, incense, topography, land use status, vegetation, shelter type, etc. for a total of 23 coordinate points. However, a food resource survey, which is a major factor affecting foxes’ habitat use, was not performed. As a result of the survey, the use of daily habitat of the fox in 2017 shows they preferred sites of relatively low altitude (100 ~ 300m), gentle slopes (0 ~ 10 °), and sunshine-rich southward directions. It is because the fox seem to have secured their shelter mainly in the villages adjacent to the human houses or roads where vegetable foods and rodents as their main food can be found. This study tried to confirm a habitat utilization pattern of released foxes by investigate the type and their surrounding environment. The most important factor in choosing the range and habitat of the wildlife is the presence and amount of food resources. To this end, it is necessary to elicit more objective and reliable research results on foxes’ habitat use by conducting a further investigation on qualitative and quantitative food resources

전산유체 기법을 이용한 DAF 부상조에서의 수리 특성 고찰

김성훈,유제선,김영미,박희경 대한상하수도학회 2002 상하수도학회지 Vol.16 No.4

Dissolved air flotation is a solid-liquid separation process that uses fine rising bubbles to remove particles in water. DAF is found most effective in treating algae and lower density flocs that are hard to remove in sedimentation process. Some researcher reports the results of an experimental study which examined the flow within the flotation zone of a DAF tank (ONeill at al., 1997). I would be concluded that, in general, the flow within flotation zone is robust and that differences in the performance of individual DAF tanks must be the result of processes occurring within the contact zones of these tank, not as the result of flotation processes. In this research, the authors thought that the efficiency of the DAF process is strongly related to bubble size. It means bubble rising velocity at the air injection nozzle is most important factor of DAF process. However, bubble movement in DAF tank is somewhat complicate, so it is hard to make up conceptual model through simple mass balance as other researchers did (Leppinen at. al., 2000). For the modeling of turbulent 2-phase flow in the tank, the standard k-ε model was used in CFD code because it is widely accepted and the coefficients for the model are well established. This model uses the eddy-viscosity hypothesis for the turbulence. As the result of this study, the authors concluded that bubble size and its rising velocity is very important factor of DAF process and the recycle ratio must be also consider for the flotation zone parameter. Also, For the improved model, relation between turbulent intensity and bubble-particle attachment must be studied.

알루미나 적층복합체에서 Fe_2O_3 첨가가 알루미나의 입자배향에 미치는 영향

송준호,박훈,정용빈,박상업 국립7개대학공동논문집간행위원회 2001 공업기술연구 Vol.1 No.-

Alumina laminate composites with alternating layers of textured and untextured were fabricated by continuous tape casting and pressureless sintering with the addition of Fe_2O_3 known to be influencing on the abnormal grain growth of alumina. Alumina grains in textured layer were aligned with (006) and (1010) plane, and the addition of Fe_2O_3 was influencing on the abnormal grain growth in untextured layer rather than texutured layer. The efffective control of crack propagation was possible through the grain orientation from the observation of crack path between textured and untextured layer.

TiO₂를 이용한 아세틸렌, 프로필렌, 프로판 가스의 광촉매 산화반응

정대일,변석인,이도훈,이용균,박유미,최순규,김동현 동아대학교 환경문제연구소 2002 硏究報告 Vol.25 No.1

Photocatalyzed degradation of acetylene, propylene, and propane gases were carried out over precoated titanium dioxide(anatase) illuminated UV light in a flow reactor. photocatalytic oxidation of acetylene, propylene, and propane gases respectively indicated high conversion rates (78.0%) to CO₂gas. And photocatalytic oxidation of three gases according to a fold, twofold, and threefold of titanium dioxide(anatase) respectively gave high conversion rate. The longer reaction time was, the higher conversion rate to CO₂gas showed.

과도한 운동으로 발생한 횡문근융해증에 의한 급성신부전증 1예

문철호,류보열,모성환,김태종,기장도,박용관,김용환,정종훈 조선대학교 1995 The Medical Journal of Chosun University Vol.20 No.1

Rhabdomyolysis may be defined as a clinical and laboratory syndrome which releases muscle cell contents into the plasma, such as creatine phosphokinase, due to skeletal muscle injuries. It can be the result of many diverse causes including muscle disease, ischemia, genetic disorder, metabolic disorder, infectious disease, drugs, comatose state, trauma or vigorous exercise that can lead to acute renal failure as a complication. Since first reported in 1941, rhabdomyolysis-induced acute renal failure has been documented many times, and the major causes of this disease are carbon monoxide poisoning, snake bites, and etc in Korea Reports of acute renal failure after exercise-related rhabdomyolysis with myoglobinemia are rare. We report a case of acute renal failure caused by exercise-related rhabdomyolysis in a 20 year old man.

Nanofunctionalized Stent-Mediated Local Heat Treatment for the Suppression of Stent-Induced Tissue Hyperplasia

Park, Jung-Hoon,Park, Wooram,Cho, Soojeong,Kim, Kun Yung,Tsauo, Jiaywei,Yoon, Sung Hwan,Son, Woo Chan,Kim, Dong-Hyun,Song, Ho-Young American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.35

<P>Current therapeutic strategies are insufficient for suppressing stent-induced restenosis. Here, branched gold nanoparticles (BGNP)-coated self-expandable metallic stents (SEMSs) were developed for a local heat-induced suppression of stent-related tissue hyperplasia. Our polydopamine (PDA) coating on SEMS allowed BGNP crystal growth on the surface of SEMSs. The prepared BGNP-coated SEMS showed effective local heating under near-infrared laser irradiation. The effectiveness of BGNP-coated SEMSs for suppressing stent-related tissue hyperplasia was demonstrated in a rat esophageal model (<I>n</I> = 52). BGNP-coated SEMS placement under fluoroscopic guidance was technically successful in all rats. The placed BGNP-coated SEMS in rat esophagus achieved three different local heat dose ranges (50, 65, and 80 °C) under fluoroscopic image-guided local irradiation. Follow-up endoscopic examination readily monitored the local heating and observed significantly decreased tissue hyperplasia at 4 weeks of local heat treatments (50 and 65 °C). Finally, Western blot, histology, immunohistochemistry (HSP70, αSMA, and TUNEL), and immunofluorescence (Ki67 and BrdU) analyses along with the statistical analysis confirmed that optimized BGNP-coated SEMS-mediated local heat treatments inducing the expression of anti-inflammatory HSP70 effectively suppresses tissue hyperplasia after stent placement in the esophagus. Our local heating with nanofunctionalized stents represents a promising new approach for suppressing stent-related tissue hyperplasia.</P> [FIG OMISSION]</BR>

Transnasal Placement of a Balloon-Expandable Metallic Stent: Human Cadaver Study of the Eustachian Tube

Park, Jung-Hoon,Kang, Woo Seok,Kim, Kun Yung,Kang, Byung-Chul,Park, Jun Woo,Kim, Min Tae,Bekheet, Nadar G.,Hwang, Seung Jun,Choi, Joonmyeong,Cho, Kyu-Jin,Park, Hong Ju,Song, Ho-Young Elsevier 2018 Journal of vascular and interventional radiology Vol.29 No.8

<P><B>Abstract</B></P> <P><B>Purpose</B></P> <P>To investigate the technical feasibility of stent placement in the cartilaginous portion of the Eustachian tube (ET).</P> <P><B>Materials and Methods</B></P> <P>Twelve ETs of 6 cadavers were used. Two different-sized stents were placed on either the right (2.5 mm in diameter) or left (3.5 mm in diameter) side of the ET. The procedural feasibility was assessed by subtraction Eustachian tubography, computed tomography before and after the procedure, and fluoroscopic and endoscopic images. The stent location, inner luminal diameter of the stented ET, radiation dose, procedural time, and fluoroscopy time were analyzed.</P> <P><B>Results</B></P> <P>Stent placement was successful in 11 of 12 cadaveric specimens without procedure-related complications. In the 1 specimen, the balloon catheter with crimped stent was passed into the bony canal of the ET without any resistance. The distal end of the stent was located in the middle ear cavity. Stents were located within the cartilaginous portion of the ET (n = 1), the proximal tip bridging the nasopharyngeal orifice of the ET (n = 5), or the proximal end of the stent protruded from the tubal orifice (n = 5). The mean luminal diameter in the outer segment was significantly smaller than in the middle (<I>P</I> < .001) and inner (<I>P</I> < .001) segments. The mean procedure time was 128 ± 37 seconds. The mean radiation dose and fluoroscopy time of each cadaver were 3235.4 ± 864.8 cGy/cm<SUP>2</SUP> and 139 ± 49 seconds, respectively.</P> <P><B>Conclusions</B></P> <P>Stent placement of the ET under endoscopic and fluoroscopic guidance is technically feasible in a human cadaver model.</P>

Significance of Stent Abutment in Gastroduodenal Stent Placement for Gastric Outlet Obstructions

Park, Jung-Hoon,Kim, Guk Bae,Song, Ho-Young,Kim, Min Tae,Kim, Pyeong Hwa,Kim, Kun Yung,Tsauo, Jiaywei,Kim, Do Hoon RADIOLOGICAL SOCIETY OF NORTH AMERICA INC 2017 JOURNAL OF VASCULAR AND INTERVENTIONAL RADIOLOGY Vol.28 No.8

<P><B>Abstract</B></P> <P><B>Purpose</B></P> <P>To evaluate the frequency, severity, and clinical significance of stent abutment (SA) after gastroduodenal stent placement in patients with gastric outlet obstruction caused by unresectable gastric cancer.</P> <P><B>Materials and Methods</B></P> <P>A retrospective study was conducted in a single tertiary referral university hospital to identify the incidence and clinical significance of SA in 318 patients who underwent self-expandable metallic stent placement. SA was defined as abutment of the distal end of the stent to the duodenal wall and/or superior duodenal flexure. The outcomes included technical and clinical success, complications, repeat intervention, stent patency, and survival.</P> <P><B>Results</B></P> <P>A total of 318 patients, 107 with SA (33.6%) and 211 without, were included. SA occurred partially (n = 64; 59.8%) and completely (n = 43; 40.2%). The technical and clinical outcomes and survival were similar in the groups with and without SA. Food impaction and resultant repeat intervention rates were higher in the SA group than in the non-SA group (<I>P</I> < .001 and <I>P</I> < .001, respectively), and were associated with complete SA (<I>P</I> = .007). Stent patency rate was lower in the SA group than in the non-SA group (<I>P</I> = .003).</P> <P><B>Conclusions</B></P> <P>SA was associated with increased food impaction, resulting in a greater incidence of stent malfunction and shorter stent patency compared with a lack of SA. The concept of SA may be useful for the improvement of stent patency and avoidance of food impaction.</P>

Radiation-induced esophageal strictures treated with fluoroscopic balloon dilation: clinical outcomes and factors influencing recurrence in 62 patients

Park, Jung-Hoon,Kim, Kun Yung,Song, Ho-Young,Cho, Young Chul,Kim, Pyeong Hwa,Tsauo, Jiaywei,Kim, Min Tae,Jun, Eun Jung,Jung, Hwoon-Yong,Kim, Sung-Bae,Kim, Jong Hoon SAGE Publications 2018 Acta radiologica Vol.59 No.3