• Proceedings of the Korean Vacuum Society Conference
• /
• 2016.02a
• /
• pp.389.2-389.2
• /
• 2016

The flexible solid state device has been widely studied as portable and wearable device applications such as display, sensor and curved circuits. A zero-bias operation without any external power consumption is a highly-demanding feature of semiconductor devices, including optical communication, environment monitoring and digital imaging applications. Moreover, the flexibility of device would give the degree of freedom of transparent electronics. Functional and transparent abrupt p/n junction device has been realized by combining of p-type NiO and n-type ZnO metal oxide semiconductors. The use of a plastic polyethylene terephthalate (PET) film substrate spontaneously allows the flexible feature of the devices. The functional design of p-NiO/n-ZnO metal oxide device provides a high rectifying ratio of 189 to ensure the quality junction quality. This all transparent metal oxide device can be operated without external power supply. The flexible p-NiO/n-ZnO device exhibit substantial photodetection performances of quick response time of $68{\mu}s$. We may suggest an efficient design scheme of flexible and functional metal oxide-based transparent electronics.

• Journal of Korean Society of Water and Wastewater
• /
• v.12 no.2
• /
• pp.83-89
• /
• 1998

The drinking water supply in Cheju entirely depends on the ground water and recently the polluted ground water bores are increasing. In 1993 Cheju Province Health-Environment Institute reported that the ground water quality of 26 of 98 bores under the drinking water quality standard. Therefore there are many investigation in the needs of the nitrate removal in the drinking water in the regin with no alternative water resources. In this study, the following results are obtained to remove the nitrate in biofilm filtration process in which uses ethanol as external carbon source. Over 90% of nitrate is removed after 10 days of experiment. The nitrate removal rate on filtration velocity is about 100% at 50m/day and 100m/day, and about 56% at 200m/day. The removal rate is reduced in 27% at 400m/day. Using ethanol as the external carbon source, denitrification kinetic is 1st-order. Denitrification constant k is 8.004($hr^{-1}$). The amount of the denitrificated-Nitrogen is increased as the contact time increased. Deoxydation rate constant ${\gamma}$ is 11.895($hr^{-1}$). 0.968g of ethanol(as TOC) is needed to remove 1g of nitrate and 0.291g is required to remove 1g of dissolved oxygen.

• Korean Journal of Psychosomatic Medicine
• /
• v.7 no.1
• /
• pp.3-9
• /
• 1999

Abnormal external appearance may cause psychiatric trauma or problem in social adaption. The plastic surgeons should consider the patient's quality of life, and their roles are correcting psychiatric and emotional trauma as well as external appearance which help the patient adapting social life. Because the patients in plastic surgery have higher level of expectation for the result of their operation, it is necessary for the surgeons to explain precisely the procedure and possible complications precisely at preoperative meeting and to maintain the good doctor-patient relationship at postoperative follow-up period. In case if the patient dissatisfy the postoperative result, it is recommended to listen the second opinion from another plastic surgeon. If the patient still dissatisfy, then the patient should be consulted to psychiatrist.

• Analytical Science and Technology
• /
• v.8 no.3
• /
• pp.273-279
• /
• 1995

Lyophilized whole blood samples containing various concentrations of Pb and Cd have been prepared as external quality control materials. These materials have been characterized with graphite furnace atomic absorption spectrometry(GFAAS), The optimized conditions for the quantitative determination of Ph and Cd in whole blood using GFAAS were obtained at the ashing temperature of $600{\sim}650^{\circ}C$ with 0.1% ammonium dihydrogen phosphate and 0.1% Triton X-100 as matrix modifier. Homogeniety and stability of the prepared whole blood have been studied at the optimized analytical condition.

• Journal of the Speleological Society of Korea
• /
• no.61
• /
• pp.5-16
• /
• 2000

Recently many environmental researcher are concerned about the ecological environment and the issue of environmental pollution in cave. In this paper we discuss about air pollution, water pollution, state of water quality, ecological environment and situation of environmental public damage in cave The concerning of air pollution in cave is mainly to the type of secondary contamination, which much is developed in various fields recently. The natural water in the most of cave is no problems but ground water has slitting with natural water during much raining period. The state of water quality is gradually contaminated with artificial environmental pollution, that is, the contents of kinds of Aluminum, Nickel, Copper, Zinc and Calcium are higher than before. On the other hand it is very important things to keep the control of constant temperature, darkness and humidity in cave. The contamination by lamp flora and even black colored contamination are appeared nowadays. The ecological environment in cave destructed by growing of mi coorganism. In fact the internal of cave is shielded with the state of climate of cave external but the environment of internal cave is contaminated, because blowing from external climate state. In addition to environmental pollution caused by carbon dioxide and body temperature of tourists. By the way eco-examination of cave is black color public damage, green color one and white color one has been discovered, so we need to have the situation of demand of environmental reservation alternatives.

• The Research Journal of the Costume Culture
• /
• v.17 no.4
• /
• pp.548-560
• /
• 2009

This study was conducted to investigate purchasing behavior of jeans consumers and to find differences in jeans evaluative criteria according to consumers' characteristics. Male and female university students participated in the study. Quota sampling method was used to collect the data. Data from 492 questionnaires were used for the statistical analysis. Descriptive analysis, factor analysis, Cronbach's alpha coefficient, ANOVA, Duncan test, and t-test were conducted. Three factors of jeans evaluative criteria classified (i.e., external criteria, internal/aesthetic criteria, internal/quality criteria). Results indicated that most of respondents put on jeans wear more than three times per a week and 38.1% of respondents reported that they owned three to four jeans products on average. Department store was the most used place to buy jeans product with 44.2%. 27.5% of respondents spent from 50,000 won to 100,000 won on purchasing jeans. Style was the highest important jeans evaluative criterion with 36.2%, followed by fitness, price, color, condition of washing treatment. Women respondents considered aesthetic criteria and quality criteria more importantly than men did. Respondents who were on a high income and spent more than 200,000 won per a month on apparel more concerned aesthetic criteria and external criteria than the other respondents did. Results of this study provide a basis for understanding jeans consumers' purchase behavior and evaluative criteria.

• ETRI Journal
• /
• v.31 no.6
• /
• pp.784-794
• /
• 2009

We present a full HD (1080p) H.264/AVC High Profile hardware encoder based on fast motion estimation (ME). Most processing cycles are occupied with ME and use external memory access to fetch samples, which degrades the performance of the encoder. A novel approach to fast ME which uses shared multibank memory can solve these problems. The proposed pixel subsampling ME algorithm is suitable for fast motion vector searches for high-quality resolution images. The proposed algorithm achieves an 87.5% reduction of computational complexity compared with the full search algorithm in the JM reference software, while sustaining the video quality without any conspicuous PSNR loss. The usage amount of shared multibank memory between the coarse ME and fine ME blocks is 93.6%, which saves external memory access cycles and speeds up ME. It is feasible to perform the algorithm at a 270 MHz clock speed for 30 frame/s real-time full HD encoding. Its total gate count is 872k, and internal SRAM size is 41.8 kB.

• IE interfaces
• /
• v.19 no.3
• /
• pp.255-269
• /
• 2006

Digital manufacturing(DM) is the ability to describe every aspect of the design-to-manufacture process digitally-using tools that include digital design, CAD, office documents, PLM(Product Life-cycle Management) systems, analysis software, simulation, CAM software and so on. The major automotive companies are already deeply invested in DM with almost every process being digital rather than paper-based. But it has taken a long time for the digital process to mature into something usable and there have been some major barriers that have prevented from the DM becoming a reality. Thus many companies hesitate to make a decision of implementing the DM. This paper deals with a study investigating which factors are important for implementing the DM to industries successfully. The extended technology acceptance model (ETAM) is used as the relation model of cause and effect. The quality of hardware, the quality of software, the range of collaboration among companies and the preference of the user are defined as the external factors. Interview method is used for gathering input data, and the results are analyzed with SPSS. The results indicate that four external factors are effective on the successful implementation of DM, and the perceived usefulness is most important.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2007.11a
• /
• pp.129-132
• /
• 2007

From this research the construction civil official is simple with the parking floor finishing material, it improves the durability of the parking floor it uses the flexible FRP it will be able to secure the drainage quality it is excellent and it presents the efficient application plan from the construction site. The performance appraisal only efficiency with of result floor of parking area material bay it knows, the result where also the performance appraisal portion re-with roof bottom finishing is satisfied it showed. The flexible FRP it applies the material to the building as to diminish the damage of the bottom finishing material due to the deterioration and the conduct and the external force of the building it is exposed to the external environment, secures the quality of the material from the construction site and will contribute to the stability against the bottom finishing material.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.20 no.6
• /
• pp.788-793
• /
• 2017

This military aircraft requires the compatibility evaluation of armed installations in accordance with guidelines and standards. In order to ensure the influence of gas-air mixtures caused by gunfire of the supersonic aircraft, CFD analysis of internal and external flows was performed and the results carried out and discussed. The low velocity vortex was formed due to the shape of the Gun Port, after firing the gas-air mixture was evacuated to the outside flow, where it moved to the front of the aircraft and soon merged with the aircraft flow field.