Ansan, South Korea
Ansan, South Korea

Ansan College of Technology is a private technical college in Ansan City, which lies south of Seoul in Gyeonggi province. It offers degree programs in social science , tourism, physical education, industrial design, engineering, and computers. All programs place a strong emphasis on vocational outcomes. The campus stands in Danwon-gu, not far from the massive industrial complex in Sihwa, which facilitates partnerships with local industry. The college enrolls about 3,000 students, and employs about 55 instructors. Wikipedia.


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Song Y.,Korea Institute of Geoscience and Mineral Resources | Yun J.,Shin Ansan University | Kim T.,Korea University
Environmental Earth Sciences | Year: 2010

In order to recycle the incineration fine bottom ash generated from municipal solid waste as a fine aggregate construction material(<4.75 mm), a series of uniaxial compression tests were carried out according to the mixing ratio of bottom ash, the curing temperature, the water cement ratio, the mixing ratio of expanded poly styrene (EPS), and the curing time. As the results of tests, the compression strengths cured 28 days of all specimens prepared with different mixing ratios are ranged between 87 and 220 kg/cm2. The water content of the hardened cement mortar is not much different with the curing time. Also, the water content is increased with increasing the mixing ratio of bottom ash, the water-cement ratio, and the mixing ratio of EPS. The unit weight of the hardened cement mortar is decreased with increasing the mixing ratio of bottom ash and the mixing ratio of EPS. The compression strength of the hardened cement mortar is decreased with increasing the mixing ratio of bottom ash. The compression strength of the hardened cement mortar cured at 30 ± 2 C and 40 ± 2 C is bigger than that of the cement mortar cured at normal temperature (20 ± 2 C). However, the compression strength of the hardened cement mortar cured at 30 ± 2 C is bigger than that of the cement mortar cured at 40 ± 2 C. The compression strength is increased at the range from 0.55 to 0.6 of water-cement ratio, and then the compression strength is decreased over 0.65 of water-cement ratio. Meanwhile, the compression strength of the hardened cement mortar is decreased with increasing the mixing ratio of EPS. © Springer-Verlag 2010.


An D.,Shin Ansan University | Park S.,Sogang University
Computer Standards and Interfaces | Year: 2011

We propose an efficient access control labeling scheme for secure query processing under dynamic Extensible Markup Language (XML) data streams. In recent years, XML has become an active research area. In particular, the needs for an efficient and secure query processing method for dynamic XML data in a ubiquitous data stream environment has become very important. The proposed access control labeling scheme supports the efficient processing of dynamic XML data, eliminating the need for re-labeling and secure query processing. Our proposal has the advantage of having an adaptable access control scheme for an existing XML labeling method. © 2011 Elsevier B.V.


PubMed | Sungkyunkwan University, University of the Philippines at Los Baños, Shin Ansan University and Myongji University
Type: Journal Article | Journal: Applied microbiology and biotechnology | Year: 2016

A novel perchlorate-reducing bacterium (PCRB), PMJ, was isolated from the mixed liquor suspended solids in the aerobic tank of a wastewater treatment plant. The 16S ribosomal RNA (rRNA), perchlorate reductase, and chlorite dismutase gene sequences revealed that PMJ belonged to the genus Azospira. PMJ was removed high-strength (700mg/L) perchlorate and also removed low-strength (50mg/L) perchlorate below the detection limit (2g/L) when acetate was used as a sole and carbon source. The maximum specific perchlorate utilization rate, q max, was 0.96mg ClO4 (-)/mg dry cell weight day, and the half-saturation constant, K S , was lower than 0.002mg ClO4 (-)/L. PMJ also utilized inorganic electron donors [(H2, S(0), and Fe(II)] with perchlorate as an electron acceptor. Perchlorate reduction by PMJ was completely inhibited by oxygen and chlorate but was not inhibited by nitrate. In the presence of similar concentrations (100140mg/L) of nitrate and perchlorate, PMJ simultaneously removed both electron acceptors. Therefore, it was concluded that the strains PMJ might possess separate pathways for perchlorate and nitrate reduction. These results indicated that Azospira sp. PMJ could be efficiently used for treating perchlorate-contaminated groundwater and wastewater because many of these water bodies are known to contain both perchlorate and nitrate. In addition, low K S value and autotrophic perchlorate reduction of PMJ might be useful to design the biological treatment systems.


Kim D.W.,Yonsei University | Chung Y.D.,Suwon Science College | Kang H.K.,Korea University | Yoon Y.S.,Shin Ansan University | Ko T.K.,Yonsei University
IEEE Transactions on Applied Superconductivity | Year: 2012

This paper describes a operating characteristics of contactless power transfer (CPT) system from normal conducting coil to HTS coil based on the electromagnet resonance coupling. The basic principle is that two separate coils with same resonance frequency are possible to form a resonant system based on high frequency magnetic coupling and exchange energy in a high efficiency. The CPT technique with the electromagnetic resonance coupling has been expected as a useful option for contactless charge and storage devices. Since the CPT technology using normal conducting coils is sensitive to tune impedance matching, the transfer power efficiency is limited. From this reason, we proposed the combination CPT technology with superconducting receiver coils, it is called as, superconducting contactless power transfer (SUCPT). The SUCPT system can reduce joint loss of superconducting connection and increase the portability of the superconducting system. In this study, as a fundamental step, the optimal power transfer conditions needed to generate inductive power transfer between normal conducting coils and superconducting coil were experimentally examined. The power transfer profile for coupled resonance coils with high frequency power was investigated in order to minimize operating power. © 2002-2011 IEEE.


Chung Y.D.,Suwon Science College | Lee C.Y.,Korea Railroad Research Institute | Kim D.W.,Yonsei University | Yoon Y.S.,Shin Ansan University | And 2 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2014

With the fast development of various wireless charging applications such as cell phones and electric vehicles, there is substantial interest in contactless power charging across an air gap. The contactless power transfer (CPT) system based on the resonance coupling method, which is composed of separate coils with the same resonance frequency, is feasible for exchanging energy within 2 m. However, generally, because the contactless charging system adopts a normal conducting wire, the size of the antenna is too large to be equipped to deliver a large amount of power promptly. From this point of view, we propose the combination of CPT technology with high-temperature superconducting (HTS) transmitter antenna, which we call the superconducting contactless power transfer (SUCPT). The superconducting transmitter antenna can deliver a mass amount of electric energy in spite of a small-scale antenna. The SUCPT technique is expected as a refined option to transfer a large amount of power and extend the distance. In this study, our research team achieved the improvement of transmission efficiency and extension of transfer distance using an HTS antenna in the inserted resonator coil between the HTS antenna and normal conducting receiver coils. We achieved improved transfer distance and quantity of about 25% compared with the normal conducting antenna under the same power conditions. © 2002-2011 IEEE.


You D.-H.,Shin Ansan University
Transactions of the Korean Institute of Electrical Engineers | Year: 2013

TiO2 thin films are fabricated using R.F.sputtering method. TiO2 thin films are coated on Al2O3 substrate printed IDEGnterdigitated electrode). Impedance of thin films decreases according to increase relative humidity and it increases according to decrease measuring frequency. When substrate temperature is room temperature, impedance of thin films is from 45.68[MHz] to 37.76[MHz] within the limits from 30[%RH] to 75[%RH] at l[kHz]. Whereas when substrate temperature is 100[°C], impedance of thin films is from 692[kHz] to 539[kHz] within the limits from 30[%RH] to 75[%RH] at 1[kHz]. Impedance variation of thin films is bigger in low frequency regions than in high frequency regions. When substrate temperature is 100[°C], impedance of thin films is lower than that of room temperature.


You D.-H.,Shin Ansan University
Transactions of the Korean Institute of Electrical Engineers | Year: 2014

The purpose of this paper is to establish the optimum fabricating condition of specimens using silk screen printing, and to develop humidity sensor which has good humidity sensing properties. The specimens are fabricated under the condition of 90[wt%] SnO2-10[wt%l TiO2, and their microstructure, crystalline structure, humidity sensing properties are examined. From the microstructure analyses, porosity is best at 700[°C]. From the crystalline structure analyses, intensity of peak becomes strong according to increasing heat treatment temperature. From the humidity sensing properties analyses, an overall results of capacitance changes, linearity and hysteresis for the specimens is best at 600 [°C] and 700[°C]. Capacitance of specimens increases according to decreasing measurement frequency, and to increasing relative humidity.


Shin K.C.,Shin Ansan University
Transactions of the Korean Society of Mechanical Engineers, A | Year: 2010

Co-cured single lap joints under cyclic tensile loads fail initially at the tip of the interface corner between the two adherents. The failure mechanism is complex because it is related to corrosion fatigue. Corrosion behavior at the interface affects the failure of the joints because corrosion deteriorates fatigue resistance. In this study, we clarified the cause of interfacial corrosion in co-cured single lap joints under cyclic tensile loads. The failure mechanism was also analyzed by observing the failed surfaces of specimens and the stress distribution along the interface. The surface roughness at the interface and the stacking sequence of the composite adherent were examined to investigate their effects on failure of the joint.


You D.-H.,Shin Ansan University
Transactions of the Korean Institute of Electrical Engineers | Year: 2016

The purpose of this study optimizes the conditions of PLA printing material for 3D printer. Deltabot type 3D printer is used. The ranges of printing temperature, printing speed, and infill density are 195∼215°, 10∼70mm/sec, and 10 ∼100% respectively. From the results of printing temperature, printing quality is almost same every printing temperature. From the results of printing speed and infill density, printing quality is excellent under 40mm/sec, and over 50% respectively. Surface roughness is 2.28 μmRa at 205°C, 10mm/sec, 100%, and is 5.93 μmRa at 205°C, 70mm/sec. Surface roughness is directly proportional to the printing speed, and is inversely proportional to the infill density. Objects fabricated PLA printing material adhere bed at room temperature. Copyright © The Korean Institute of Electrical Engineers.


PubMed | Shin Ansan University
Type: Journal Article | Journal: Bioorganic & medicinal chemistry letters | Year: 2016

The recent success of vemurafenib shows the importance of selective BRAF V600E inhibition in melanoma. However, paradoxical activation by structurally diverse ATP-competitive RAF kinase inhibitors strongly suggests that selective CRAF inhibitors, not BRAF inhibitors, would be ideal for some Ras mutation cancer treatment. In this respect, we approached designing selective CRAF inhibitors starting from in silico fragment screening and synthesized a 3-carboxamido-2H-indazole-6-arylamide scaffold. Most of the compounds showed potent antiproliferative activity against the WM3629 melanoma cell line and the most promising compound, compound 10d, was found to be a potent and selective CRAF inhibitor with an IC50 value of 38.6 nM, which shows greater than 270-fold selectivity over BRAF kinase (9.45 M).

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