• KIPS Transactions on Computer and Communication Systems
• /
• 제9권1호
• /
• pp.1-8
• /
• 2020

The thermal image device support image to detect infrared light from the object without light. It can use not only defence-related industry, but also civilian industry. This paper presents a new thermal image processing module using common image processor. The proposed module shows 10~20% performance improvement with normal mode and 50% performance improvement with sleep mode compared with the previously thermal image module based FPGA. and it guarantees high scalability according to modular system. In addition, the proposed module improves modulation and reuse, so it expect to have reduction of development period, low development cost. various application. In addition, it expect to have satisfaction of customer requirements, development design, development period, release date of product.

• Korean Journal of Applied Biomechanics
• /
• 제26권3호
• /
• pp.243-248
• /
• 2016

Objective: The aim of this study was to determine the kinematical characteristics of somersault with twist in the Lou Yun and Akopian motions and to provide useful information to gymnastic athletes in men's vault. Method: The study subjects were 12 male adult top athletes. After 12 trials (7 Lou Yun and 5 Akopian trials) filmed by using two digital high-speed camcorders set at 90 frames/sec, kinematical data were collected through the direct linear transformation (DLT) method. The mean differences in biomechanical variables were compared during the second flight upward phase. The kinematic characteristics of somersault with twist in the Lou Yun and Akopian motions were identified. Results: In Lou Yun motion, the vertical release velocity through horse breaking was not difficult to obtain, so the athletes had enough time to prepare for the twist. Therefore, the Lou Yun motion has an advantage to make a cat twist in the pike posture. In the Akopian motion, obtaining the horizontal velocity through horse pushing was so easy that the Akopian athletes attained a large angular impulse and angular momentum. Therefore, the Akopian motion has an advantage to making a tilt twist in the body tilting posture. Conclusion: This study suggests that gymnastic athletes should control their body segment movements in order to increase the twisting angular velocity of the whole body, which requires regulation of the longitudinal moment of inertia of the body. Moreover, athletes should prepare for the shoulder and hip twists early in order to make the landing position in advance.

• Proceedings of the Korean Vacuum Society Conference
• /
• 한국진공학회 1998년도 제14회 학술발표회 논문개요집
• /
• pp.132-132
• /
• 1998

Ion bombardment in the keV range is known to induce drastic chemical modifications in organic and inoranic molecular comppounds. A degrading effects in orgainc materials such as the release of ppolymer compponents and the chemistry of the iradiation pprocess have been observed. The work to be described was carried out in order to understand the irradiation effect better. The sampple(ppolyimide : Kappton ) Were irradiated by Ar+, Ne+, H+ ions and electrons (3 keV) to fluence ranging from ~1$\times$1015 to ~1$\times$1017 ions/$cm^2$ at room tempperature. The impplant was usually rastered over an area of a few $cm^2$ . These ion impplantation were carried out in an electron sppectrometer ESCA 5700 (ppHI Ltd) at a residual gas ppressure of ~5$\times$10-10 Torr. X-ray pphotoelectron sppectroscoppy(XppS) measurements were made using a monochromatized Al Kａ(1486.6 eV) excitation source. The pphotoemitted electrons were detected by hemisppherical analyser with a ppass energy of 23.5 eV. Core-level binding energies were referenced to the Fermi level. To avoid the charging effect it was used the neutralizer. We studied the irradiation effects on ppolyimide with Ar+, Ne+, He+ ions and electrons by XppS which 추 pprovide detailed information concerning the bonding-induced changes.

• Journal of Korean Society on Water Environment
• /
• 제30권1호
• /
• pp.16-24
• /
• 2014

A combined watershed and receiving waterbody model was developed for operational water flow forecasting of the Nakdong river. The Hydrological Simulation Program Fortran (HSPF) was used for simulating the flow rates at major tributaries. To simulate the flow dynamics in the main stream, a three-dimensional hydrodynamic model, EFDC was used with the inputs derived from the HSPF simulation. The combined models were calibrated and verified using the data measured under different hydrometeological and hydraulic conditions. The model results were generally in good agreement with the field measurements in both calibration and verification. The 7-days forecasting performance of water flows in the Nakdong river was satisfying compared with model calibration results. The forecasting results suggested that the water flow forecasting errors were primarily attributed to the uncertainties of the models, numerical weather prediction, and water release at the hydraulic structures such as upstream dams and weirs. From the results, it is concluded that the combined watershed-waterbody model could successfully simulate the water flows in the Nakdong river. Also, it is suggested that integrating real-time data and information of dam/weir operation plans into model simulation would be essential to improve forecasting reliability.

• Proceedings of the KAIS Fall Conference
• /
• 한국산학기술학회 2010년도 춘계학술발표논문집 2부
• /
• pp.910-914
• /
• 2010

A collision between a barge and an oil tanker of Hebei Spirit caused the release of an estimated 12,547 tons of light crude oil into the Yellow Sea off the west coast of Taean-gun, Korea on December 7, 2007. This study was aimed to evaluate exposure conditions and acute health effects in soldiers participating in the Hebei Spirit oil spill cleanup activities and the association between these and the nature of the work and use of protection devices. The sample comprised 2,624 soldiers stratified by working area and number of working days. We divided working area into the coast of Taean-gun(highly polluted area) and other areas affected by Hebei Spirit oil spill. And we divided number of working days into 1-7 days, 8-14 days, 15-21 days and above 22 days. Data were obtained via a structured, self-administered questionnaire and included information on working area, type of working, number of working days, use of protective materials, and acute health effects. Acute health effects were classified into 5 groups: neurological, respiratory, dermatologic, ophthalmic and other symptoms. Data analysis was performed using unconditional logistic regression used to compute odds ratios and 95% confidence intervals. On logistic regression analysis, working on the coast of Taean-gun was significantly associated with increased risk of acute health problems: headache, dizziness, nausea, general fatigue, insomnia, flushed face, sore throat, dry throat, runny nose, cough, sputum, skin irritation, sore eyes, injection of conjunctiva, tear, and low back pain. Furthermore soldiers working more than 21 days were significantly associated with increased risk of acute health problems: insomnia, flushed face, sore throat, runny nose, cough, sputum, tear, low back pain and fever. Accordingly, the exposure to the oil and the subsequent cleanup efforts were suggested to inflict acute health problems on soldiers participating in the Hebei Spirit oil spill cleanup activities.

• The Journal of the Korea Contents Association
• /
• 제13권10호
• /
• pp.92-102
• /
• 2013

The definition of mobile phone was a device that can make and receive telephone calls or messages for communication but it has rapidly developed from communication tool into multi-function device. Especially since release of smart phone, Korea is one of the highest country in the world and the statistics can be interpreted into people positively accept new technology. Therefore it's time to study on usage behavior according to different generation of mobile phone. Based on media richness theory and elaboration likelihood model, we analyzed factors affecting usage behavior of mobile phone. Case study methodology were constructed a survey to female university students from 20-24 years of age.

• KIISE Transactions on Computing Practices
• /
• 제21권3호
• /
• pp.247-256
• /
• 2015

Since the Gulf War, air power has played a key role. However, the effect of high-tech weapons, such as laser-guided bombs and electronic optical equipment, drops significantly if they do not match the weather conditions. So, aircraft that are assigned to carry laser-guided bombs must replace these munitions during bad weather conditions. But, there are no objective criteria for when weapons should be replaced. Therefore, in this paper, we propose an algorithm to predict the hit rate of laser-guided bombs using cloud image processing. In order to verify the accuracy of the algorithm, we applied the weather conditions that may affect laser-guided bombs to simulated flight equipment and executed simulated weapon release, then collected and analyzed data. Cloud images appropriate to the weather conditions were developed, and applied to the algorithm. We confirmed that the algorithm can accurately predict the hit rate of laser-guided bombs in most weather conditions.

• Journal of KIISE
• /
• 제42권12호
• /
• pp.1551-1560
• /
• 2015

Software Reliability Growth Models (SRGMs) are used to quantitatively evaluate software reliability and to determine the software release date or additional testing efforts using software failure data. Because a single SRGM is not universally applicable to all kinds of software, the selection of an optimal SRGM suitable to a specific case has been an important issue. The existing methods for SRGM selection assess the goodness-of-fit of the SRGM in terms of the collected failure data but do not consider the accuracy of future failure predictions. In this paper, we propose a method for selecting SRGMs using the trend of failure data and failure prediction ability. To justify our approach, we identify problems associated with the existing SRGM selection methods through experiments and show that our method for selecting SRGMs is superior to the existing methods with respect to the accuracy of future failure prediction.

• Nuclear Engineering and Technology
• /
• 제48권4호
• /
• pp.881-892
• /
• 2016

Following the Fukushima accident and its extended station blackout, attention was brought to the importance of the spent fuel pools' (SFPs) behavior in case of a prolonged loss of the cooling system. Since then, many analytical works have been performed to estimate the timing of hypothetical fuel uncovery for various SFP types. Experimentally, however, little was done to investigate issues related to the formation of a flammable gas mixture, distribution, and stratification in the SFP building itself and to some extent assess the capability for the code to correctly predict it. This paper presents the main outcomes of the Experiments on Spent Fuel Pool (ESFP) project carried out under the auspices of Swissnuclear (Framework 2012-2013) in the PANDA facility at the Paul Scherrer Institut in Switzerland. It consists of an experimental investigation focused on hydrogen concentration build-up into a SFP building during a predefined scaled scenario for different venting positions. Tests follow a two-phase scenario. Initially steam is released to mimic the boiling of the pool followed by a helium/steam mixture release to simulate the deterioration of the oxidizing spent fuel. Results shows that while the SFP building would mainly be inerted by the presence of a high concentration of steam, the volume located below the level of the pool in adjacent rooms would maintain a high air content. The interface of the two-gas mixture presents the highest risk of flammability. Additionally, it was observed that the gas mixture could become stagnant leading locally to high hydrogen concentration while steam condenses. Overall, the experiments provide relevant information for the potentially hazardous gas distribution formed in the SFP building and hints on accident management and on eventual retrofitting measures to be implemented in the SFP building.

• Journal of Pharmaceutical Investigation
• /
• 제34권3호
• /
• pp.185-192
• /
• 2004

The objective of this study was to evaluate the effects of surfactant type and concentration upon dissolution rates of carbamazepine from an immediate-release tablet. The dissolution media used in this study were aqueous solutions containing 0.1-2% sodium lauryl sulfate, cetyltrimethylammonium bromide, or polysorbate 80. The solubility of carbamazepine in the dissolution media was determined at first. A dissolution study was then conducted by using the USP dissolution apparatus II (paddle method) with an agitation rate of 75 rpm. Aliquots of the dissolution media were taken at predetermined time intervals, and the amount of carbamazepine dissolved was measured spectrophotometrically at 285 nm. The dissolution data obtained were fitted into a biphasic exponential equation with four parameters. Excellent correlations were observed between the experimental data and the theoretical ones predicted by the equation. This equation permitted the calculation of $T_{50%}$ (the time required for dissolving 50% of carbamazepine) under various experimental conditions. Differentiation of the equation also led to the attainment of dissolution rates at dissolution time points. The addition of a surfactant to an aqueous solution led to increasing the solubility of carbamazepine by 3- to 12-folds, depending upon its type and concentration. This event also resulted in enhancing the magnitude of a sink condition during the dissolution study. As a result, the dissolution rate of carbamazepine was affected by the aqueous surfactant concentration in a proportional manner. Subsequently, $T_{50%}$ values declined rapidly, as the surfactant concentration increased. Such effects were observed in decreasing order of sodium lauryl sulfate, cetyltirmethylammonium bromide, and polysorbate 80. These results clearly demonstrated that it was possible to tailor a dissolution rate and $T_{50%}$ of carbamazepine by manipulating the type and concentration of a surfactant. Relevant information would be beneficial to setting up dissolution specifications for poorly water-soluble drug products.