• Proceedings of the Korean Vacuum Society Conference
• /
• 2013.02a
• /
• pp.498-498
• /
• 2013

Atmospheric Pressure Plasmas have pioneered a new field of plasma for biomedical application bridging plasma physics and biology. Biological and medical applications of plasmas have attracted considerable attention due to promising applications in medicine such as electro-surgery, dentistry, skin care and sterilization of heat-sensitive medical instruments [1]. Traditional approaches using electronic devices have limits in heating, high voltage shock, and high current shock for patients. It is a great demand for plasma medical industrial acceptance that the plasma generation device should be compact, inexpensive, and safe for patients. Microwave-excited micro-plasma has the highest feasibility compared with other types of plasma sources since it has the advantages of low power, low voltage, safety from high-voltage shock, electromagnetic compatibility, and long lifetime due to the low energy of striking ions [2]. Recent experiment [2] shows three-log reduction within 180-s treatment of S. mutans with a low-power palm-size microwave power module for biomedical application. Experiments using microwave plasma are discussed. This low-power palm-size microwave power module board includes a power amplifier (PA) chip, a phase locked loop (PLL) chip, and an impedance matching network. As it has been a success, more compact-size module is needed for the portability of microwave devices and for the various medical applications of microwave plasma source. For the plasma generator, a 1.35-GHz coaxial transmission line resonator (CTLR) [3] is used. The way of reducing the size and enhancing the performances of the module is examined.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2013.02a
• /
• pp.669-669
• /
• 2013

Hierarchical N doped TiO2 nanostructured catalyst with micro, meso and macro porosity have been synthesized by a facile self-formation route using ammonia and titanium isopropoxide precursor. The samples were calcined in different calcination temperature ranging from $300^{\circ}C$ to $800^{\circ}C$ at slow heating rate ($5^{\circ}C$/min) and designated as NHPT-300 to NHPT-800. $TiO_2$ nanostructured catalyst have been characterized by physico-chemical and spectroscopy methods to explore the structural, electronic and optical properties. UV-Vis diffuse reflectance spectra confirmed the red shift and band gap narrowing due to the doping of N species in TiO2 nanoporous catalyst. Hierarchical macro porosity with fibrous channel patterning was observed (confirmed from FESEM) and well preserved even after calcination at $800^{\circ}C$, indicating the thermal stability. BET results showed that micro and mesoporosity was lost after $500^{\circ}C$ calcination. The photocatalytic activity has been evaluated for methanol oxidation to formaldehyde in visible light. The enhanced photocatalytic activity is attributed to combined synergetic effect of N doping for visible light absorption, micro and mesoporosity for increase of effective surface area and light harvestation, and hierarchical macroporous fibrous structure for multiple reflection and effective charge transfer.

• Journal of Korean Society for Atmospheric Environment
• /
• v.34 no.5
• /
• pp.639-650
• /
• 2018

Identification of the major sources contributing to PM is of importance in order to understand their quantitative contributions to atmosphere. In the viewpoint of the meat cooking in Korea, only a few analyses of organic molecular markers have been conducted due to analytical difficulties. In this study, ten different parts of meat (i.e., blade shoulder, belly, and arm shoulder of pork; ribeye roll, top blade muscle, and short plate of beef; leg quarter, breast, and wing of chicken; duck; mackerel) were pyrolyzed to generate the cooked PM using an electronic heating plate. Generated PM were collected by the pyrolysis sampling system to identify total carbon (TC) using a carbon analyzer and cholesterol using a Liquid chromatography tandem-mass spectrometry (LC-MSMS) based on fragmentor voltage (FV), precursor ion, collision energy, product ion. In addition, oxydative potential (OP) analysis using dithiothreitol (DTT) method were discussed to investigate the toxicity relates. Highly correlated pairwise scatterplots between the cholesterol and TC indicate that oxydative potential was highly associated with different parts of meat. This study provides insight into the meat cooking components of PM, which could be drivers of the oxidative potential relates.

• Journal of the Microelectronics and Packaging Society
• /
• v.22 no.1
• /
• pp.35-41
• /
• 2015

In this study, in order to improve the reliability of ACF interconnections, solder ACF joints were investigated interms of solder joint morphology and solder wetting areas, and evaluated the electrical properties of Flex-on-Board (FOB) interconncections. Solder ACF joints with the ultrasonic bonding method showed excellent solder wetting by broken solder oxide layers on solder surfaces compared with solder joints with remaining solder oxide layer bonded by the conventional thermo-compression (TC) bonding method. When higher target temperature was used, Sn58Bi solder joints showed concave shape due to lower degree of cure of resin at solder MP by higher heating rate. ACFs with epoxy resins and SAC305 solders showed lower degree of resin cure at solder MP due to the slow curing rate resulting in concave shaped solder joints. In terms of solder wetting area, solder ACFs with $25-32{\mu}m$ diameters and 30-40 wt% showed highest wetted solder areas. Solder ACF joints with the concave shape and the highest wetting area showed lower contact resistances and higher reliability in PCT results than conventional ACF joints. These results indicate that solder morphologies and wetting areas of solder ACF joints can be controlled by adjustment of bonding conditions and material properties of solder and polymer resin to improve reliability of ACF joints.

• Journal of Korean Medicine Rehabilitation
• /
• v.19 no.3
• /
• pp.47-67
• /
• 2009

Objectives : To research the trend of the study related to pharmacopuncture about musculoskeletal and nervous diseases in China and to make a comparison with clinical application on pharmacopuncture about musculoskeletal and nervous diseases in China and Korea. Methods : I reviewed and analyzed four Chinese Journals relating pharmacopucture from 2004 to 2008 and two Korean Journals relating pharmacopuncture from 1999 to 2008. Results : The following results were obtained in this study. 1. The pharmacopuncture was often used for diseases of spines and joints. 2. In the medicine of pharmacopuncture, Salviae Miltiorrhizae Radix, Angelicae Gigantis Radix were mainly used in China, and Bee-venom in Korea. 3. As a method of needling, local acupoint and Ashi-point were mainly ueed in both China and Korea. 4. In combined treatments, acupuncture, electronic acupuncture, Chuna, heating acupuncture were mainly used in China, and acupuncture, herb medicine, physiotherapy in Korea. 5. In the case of control group study, compared with other treatments pharmacopuncture was not verified the superiority of effectiveness in China, but in Korea, the effectiveness of a pharmacopuncture could be compared with that of others and the effectivenss of different pharmacopuncture could be compared. Conclusions : As seen above, in Korea, clinician should carry out clinical application about musculoskeletal and nervous diseases with various herbal injections besides Bee-venom. And I think that it will be starting point to use Salviae Miltiorrhizae Radix and Angelicae Gigantis Radix that were often used in China.

• Journal of Advanced Marine Engineering and Technology
• /
• v.36 no.4
• /
• pp.430-436
• /
• 2012

This study was conducted to measure battery's voltage drop in a compact electric vehicle to get driving performance in various driving situations. In the experiment, to evaluate the energy consumption and milage, system performance have measured with changing of the driving speed and the reduction of driving distance when the heater was operating. The battery of the car in this study is lead type storage battery. The driving velocity was changed from 10km/h to 50 km/h with 20km/h intervals and the operating step of the heating device. As results, the electronic consumption rate was maximum at 35 km/h of vehicle speed and if the driver turning the heater at maximum, capacity will lead to 35% of energy consumption increment.

• Journal of the Korean Ceramic Society
• /
• v.22 no.3
• /
• pp.35-40
• /
• 1985

The composition of the base glass was determined to be $Na_2O$ 15, $Fe_2O_3$ 35, $B_2O_3$ 0~20, $P_2O_5$ 30~50 by mole percent. The heating temperature for nucleation was determined by means of thermal expansion curve. Crystalline phases were investigated by X-ray diffraction method and I.R Spectra. Electrical conductivities of glass spec-imens were observed in the temperature range 25~20$0^{\circ}C$ The activation energies of these specimens were caculated. The results obtained were as follows : 1) The limit composition of the melts 15mol% $Na_2O$ 35mole% $Fe_2O_5$ 20mole% $B_2O_3$ 30mole% $P_2O_5$ was able to be formed into desired shapes during cooling, . 2) In the measurement of d. c conductivity($\delta$) on the glasses in the system $15Na_2O-35Fe_2O_3$-$B_2O_3$-(50-x) $P_2O_5$ the values decreased by replacing 5 mole% $P_2O_5$ with $B_2O_3$ 3) The d. c conducties of heat treated samples were increased by replacing $P_2O_5$ with $B_2O_3$ 4) $B_2O_3$ contributed to precipitate crystals such as${\gamma}$-$Fe_2O_3$ $Fe_3O_4$ which had the advantage of electronic conduction in heat treated samples. 5) The slope plotted Log($\delta$) versus 1/T in this glass system was linear in the measured temperature range.

• Composites Research
• /
• v.30 no.6
• /
• pp.350-355
• /
• 2017

The new liquid crystalline (LC) epoxy was designed by substituting the phenylcyclohexyl (PCH) mesogen moiety with an alkyl chain at the 2,5 position of the diglycidyl terephthalate. The mesomorphic properties were evaluated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). All LC epoxy derivatives exhibited an enantiotropic smectic phase upon heating and cooling process. The LC phase temperature range was widened by mixing the eutectic mixture of LC epoxies. Interestingly, the cured LC epoxy exhibited the highest thermal conductivity of $0.4W{\cdot}m^{-1}{\cdot}K^{-1}$. The novel LC epoxy with high thermal conductivity might be used as a composite material for electronic and display devices.

• The Journal of Korean Medicine
• /
• v.17 no.1 s.31
• /
• pp.222-233
• /
• 1996

In order to understand the stimulation quality of Artemisine Vulgaris Folium(Bong), Mori Ramulus(Sangi) and Persicae Ramulus(Dogi) combustion, and get the basic data for the development of electric moxibustion apparatus, the average temperature, peak temperature, average gradient temperature, maximum gradient temperature and combustion time of heating period on the three moxa materials were measured. 1. The average combustion temperature was high in order of Dogi, Sangi and Bong, and these were acknowledged to have a significant difference each other in the average temperature. 2. The peak combustion temperature among those was high in order of Dogi, Sangi and Bong, and Bong was acknowledged to have significant differences with Dogi and Sangi. Sangi and Dogi however were not acknowledged to have difference each other. 3. The average gradient temperature among those was high in order of Dogi, Sangi and Bong, and Bong was proved to have significant differences with Dogi and Sangi. Sangi and Dogi however were not proved to have difference each other. 4. The maximum temperature among those was high in order of Dogi, Sangi and Bong, bong was acknowledged to have signigicant differences with Dogi and Sangi, but Sangi and Dogi were not proved to have difference each other. 5. The combustion time was short in order of Dogi, Sangi and Bong. Bong was acknowledged to have significant differences with Dogi and Sangi, but Sangi and Dogi were not. In order to understand well the characteristics of combustion, it is required to have a quantitative interpretation of combustion calory, and, in the future, we expect it is required to have a consistent study for the clinical effectiveness and the mutual relationship according to the combustion characteristics.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.23 no.2
• /
• pp.107-112
• /
• 2013

In the paper, velocity controller of switching module and temperature controller for the high-voltage static var compensator are proposed. Because of the continuous increase in demand for electric power, transmission and distribution facilities of power plant are required. There is a bottleneck problem of transportation routes according to new construction and expansion of power transmission facilities. Therefore there are researches to maximize the utilization of existing facilities and to increase transmission capacity without new construction. The previous static var compensator detects voltage of input circuit of power, switches the SCR directly and generates switching noise. The proposed method increases switching velocity and decreases noise using switching control based on the voltage between both sides of SCR. Also the proposed method enhance the stability using realtime temperature control for heating of the system from increase of switching velocity. We experiment the velocity and temperature control of the proposed high-voltage static var compensator in the real environment and verify the performance of the proposed system by applying in the real field.