• Journal of Korean Neurosurgical Society
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• v.53 no.3
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• pp.161-166
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• 2013

Objective : Neuroendoscopy is applied to various intracranial pathologic conditions. But this technique needs informations for the anatomy, critically. Neuronavigation makes the operation more safe, exact and lesser invasive procedures. But classical neuronavigation systems with rigid pinning fixations were difficult to apply to pediatric populations because of their thin and immature skull. Electromagnetic neuronavigation has used in the very young patients because it does not need rigid pinning fixations. The usefulness of electromagnetic neuronavigation is described through our experiences of neuroendoscopy for pediatric groups and reviews for several literatures. Methods : Between January 2007 and July 2011, nine pediatric patients were managed with endoscopic surgery using electromagnetic neuronavigation (AxiEM, Medtronics, USA). The patients were 4.0 years of mean age (4 months-12 years) and consisted of 8 boys and 1 girl. Totally, 11 endoscopic procedures were performed. The cases involving surgical outcomes were reviewed. Results : The goal of surgery was achieved successfully at the time of surgery, as confirmed by postoperative imaging. In 2 patients, each patient underwent re-operations due to the aggravation of the previous lesion. And one had transient mild third nerve palsy due to intraoperative manipulation and the others had no surgery related complication. Conclusion : By using electromagnetic neuronavigation, neuroendoscopy was found to be a safe and effective technique. In conclusion, electromagnetic neuronavigation is a useful adjunct to neuroendoscopy in very young pediatric patients and an alternative to classical optical neuronavigation.

• Journal of Korean Society for Geospatial Information Science
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• v.10 no.2 s.20
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• pp.87-95
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• 2002

Real-time Kinematic GPS enables high accuracy Positioning by real time. If ambiguity use an integer solution, can obtain accuracy of several 'mm', and can obtain accuracy of tens 'em' if use real solution. In this study, We accomplish surveying by existent traditional surveying techniques (Total Station), Static GPS techniques and RTK-GPS techniques by Field Calibration about uniformity measuring point and then compared and ana1yzed each techniques positioning accuracy etc.. Result that achieve by Static-GPS in Plane area, about all measuring points, expressed error fewer than 3cm. Result that achieve RTK-GPS Surveying by Field Calibration in Plane area, could know that RTK-GPS techniques by Field Calibration is available in Plane area because expressing errors fewer than all 6cm, except case that do not get fixed solution of ambiguity Field Calibration RTK-GPS could know economically than existent conventional type measurement and existent GPS's measurement techniques that efficiency is very high.

• The Korean Journal of Pesticide Science
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• v.9 no.2
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• pp.153-158
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• 2005

Safening activities of optically active ${\alpha}$-methylbenzylphenylureas on crop injury of rice (Oryza sativa L., cv. Tsukinohikari, japonica) caused by bensulfuron-methyl (methyl 2-[[[[[(4,6-dimethoxy-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]methyl]benzoate) and pyribenzoxim (benzophenone o-[2,6-bis[(4,6-dimethoxy-2-pyrimidinyl)oxy]benzoyl]oxime) were investigated. Some derivatives of the optically active compounds exhibited strong safening activity against growth inhibition of rice by bensulfuron-methyl. Out of the derivatives tested, (S)-2,3-diCl and (S)-2-F-4-Me derivatives showed greater relieving activity than that of dymuron. In addition, the stress relieving activity was also obtained when they were applied at 4 days after bensulfuron-methyl treatment. On the other hand, crop injury caused by pyribenzoxim was relieved by about 95% with (S)-2-F-4-Me derivative in shoots and roots of rice seedlings.

• Journal of Haehwa Medicine
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• v.8 no.2
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• pp.317-327
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• 2000

Through the study about Che-Qi-Jung(諸氣證) concerned with phenomenon of stress, we concluded as fallow. 1. Stressors are recognized three parts, internal cause, external cause, non-interexternal cause, in the oriental medicine. And the reaction of the body about stressors, was expressed change of Qi(氣). 2. The vascular system and autonomic nervous system are tensed or relexed. Because the etiology of Yuk-Em(六淫), Chil-Jeong(七情) make lose up and down, in and out, circulation of Gi(氣). The symtom caused with stress are explained, divided into Chil-Qi(七氣), Gu-Qi(九氣), Joong-Qi(中氣), Qi-Tong(氣痛), Qi-Yuk(氣逆), Qi-Wool(氣鬱). 3. The symtom of Chil-Qi is recognized into psycholoQical stress and Mae-Haek-Qi(梅核氣). The symtom of Gu-Qi is composed of Chil-Qi and Han(寒), Youl(熱), Ro(勞). 4. The symtoms of Qi-Yuk and Joong-Qi are caused by the ascent of Hwa-Qi(火氣). And Hwa-Qi is made by rage and depression. Qi-Yuk is chronic symtom that the ascent of Hwa-Qi is made by out of function in up and down mechanism of Qi. Joong-Qi is acute symtom that patholoQical state of Qi-Yuk take place for a while by sudden psycholoQical shock. 5. The symtom of Qi-Wool is loss of funtion made by depressed state in physioloQical mechanism, and Qi-Wool is observed in depressive psychosis and hypochondriasis and psychogenic. 6. The symtom of Qi-Tong is the pain caused by interference of circulation of Qi-Hyul(氣血). PsycholoQical stimulation such as rage and depression, tense autonomic nervous system. This make convulsion in gastro-intestine or vascular circuluation or abdominal muscles, and the pain is caused by convulsion.

• Journal of the Korean Ceramic Society
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• v.43 no.3 s.286
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• pp.169-172
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• 2006

We have synthesized a $Eu^{2+}-activated\;{(Sr,Ba)}_2SiO_4$ yellow phosphor and investigated the development of blue LEDs by combining the phosphor with a InGaN blue LED chip (${\lambda}_{em}$=405 nm). The InGaN-based ${(Sr,Ba)}_2SiO_{4}:Eu$ LED lamp shows two bands at 405 nm and 550 nm. The 405 nm emission band is due to a radiative recombination from a InGaN active layer. This 405 nm emission was used as an optical transition of the ${(Sr,Ba)}_2SiO_{4}:Eu$ phosphor. The 550 nm emission band is ascribed to a radiative recombination of $Eu^{2+}$ impurity ions in the ${(Sr,Ba)}_2SiO_4$ host matrix. In the preparation of UV Yellow LED Lamp with ${(Sr,Ba)}_2SiO_{4}:Eu$ yellow phosphor, the highest luminescence efficiency was obtained at the epoxy-to-yellow phosphor ratio of 1:0.45. At this ratio, the CIE chromaticity was x=0.4097 and y=0.5488.

• Transactions on Electrical and Electronic Materials
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• v.3 no.2
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• pp.10-15
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• 2002

In this paper, the electrical characteristics of fabricated p+-n junction diode are demonstrated and interpreted with different theoretical calculations. Dopants distribution by boron ion implantation on silicon wafer were simulated with TRIM-code and ICECaEM simulator. In order to make electrical activation of implanted carriers, thermal annealing treatments are carried out by RTP method for 1min. at $1000^{circ}C$ under inert $N_2$ gas condition. In this case, profiles of dopants distribution before and after heat treatments in the substrate are observed from computer simulations. In the I-V characteristics of fabricated diodes, an analytical description method of a new triangular junction model is demonstrated and the results with calculated triangular junction are compared with measured data and theoretical calculated results of abrupt junction. Forward voltage drop with new triangular junction model is lower than the case of abrupt junction model. In the C-V characteristics of diode, the calculated data are compared with the measured data. Another I-V characteristics of diodes are measured after proton implantation in electrical isolation method instead of conventional etching method. From the measured data, the turn-on characteristics after proton implantation is more improved than before proton implantation. Also the C-V characteristics of diode are compared with the measured data before proton implantation. From the results of measured data, reasonable deviations are showed. But the C-V characteristics of diode after proton implantation are deviated greatly from the calculated data because of leakage currents in defect regions and layer shift of depletion by proton implantation.

• Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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• v.1
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• pp.375-400
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• 1999

Bei der maschinellen $\"{U}bersetzung(=M\"{U})\;\"{u}bernimmt$ ein Computer die Aufgabe, Texte von einer $nat\"{u}rlichen$ Sprache in eine andere automatisch zu $\"{u}bertragen$. Die meisten $M\"{U}-Systeme$ wurden bis in die 90er Jahre $haupts\"{a}chlich$ von grossen Firmen benutzt, die viele kostenaufwendige $\"{U}bersetzungsarbeiten\;zu\;bew\"{a}ltigen$ hatten. Aber die schnelle Verbreitung des Internets in den Alltag vieler Menschen hat die Situation radikal $ge\"{a}ndert$, und zwar so, $da\ss$ ein $M\"{U}-System$ viel $h\"{a}ufiger$ verwendet wird und es auch bei individuellem Bedarf Anwendung findet. Mit zunehmendem Volumen der zu $\"{u}bersetzenden$ Texte im Internet wird die Nachfrage nach einem $M\"{U}-System\;immer\;gr\"{o}sser$. Ziel der vorliegenden Arbeit ist es, ein Verfahren der maschinellen $\"{U}bersetzung$ der deutschen WWW-Texte ins Koreanische zu beschreiben. Dazu habe ich versucht, zwei unterschiedliche $M\"{U}-Systeme$ zu koppeln. Das Potential dieser Methode ist vor allem deswegen zu untersuchen, weil die sogenannte Lingware fur das Koreanische und Deutsche, wie z.B. Lexikon, Grammatik, Transfer-Lexikon, nur begrenzt zur $Verf\"{u}gung$ steht. Das erste System ist das $M\"{U}-System\;SYSTRAN\;f\"{u}r$ das Sprachpaar Deutsch-Englisch, das die deutschen WWW-Texte ins Englische $\"{u}bersetzt$. Das zweite ist em $M\"{U}-System\;f\"{u}r$ das Sprachpaar Englisch-Deutsch, das die vom Deutschen ins Englische $\"{u}bersetzten$ Texte ins Koreanische $\"{u}bersetzt$. Bei der Evaluierung der $\"{U}bersetzungen$ vom Deutschen ins Koreanische konnten etwa $30\%$ der Ausgaben als korrekt bewertet werden.

• ETRI Journal
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• v.39 no.1
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• pp.51-61
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• 2017

This paper demonstrates a systematic approach for the design of broadband, high efficiency, high power, Class-AB RF amplifiers with high gain flatness. It is usually difficult to simultaneously achieve a high gain flatness and high efficiency in a broadband RF power amplifier, especially in a high power design. As a result, the use of a computer-aided simulation is most often the best way to achieve these goals; however, an appropriate initial value and a systematic approach are necessary for the simulation results to rapidly converge. These objectives can be accomplished with a minimum of trial and error through the following techniques. First, signal gain variations are reduced over a wide bandwidth using a proper pre-matching network. Then, the source and load impedances are satisfactorily obtained from small-signal and load-pull simulations, respectively. Finally, two high-order Chebyshev low-pass filters are employed to provide optimum input and output impedance matching networks over a bandwidth of 100 MHz-500 MHz. By using an EM simulation for the substrate, the simulation results were observed to be in close agreement with the measured results.

• The Korean Fashion and Textile Research Journal
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• v.14 no.3
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• pp.486-491
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• 2012

This study examined the sound characteristics of Taekwondo uniform fabrics to investigate the relationship between the sound parameters and the mechanical properties of the fabric as well as to provide the conditions to maximize the frictional sound of the uniform. Frictional sounds of 6 fabrics for Taekwondo uniforms were generated by the Simulator for Frictional Sound of Fabrics. The frictional speeds were controlled at low(0.62 m/s), at mid(1.21 m/s) and at high(2.25 m/s) speed, respectively. The frictional sounds were recorded using a Data Recorder and Sound Quality System subsequently, the physical sound properties such as SPL(Sound Pressure Level) and Zwicker's psychoacoustic parameters were calculated. Mechanical properties of specimens were measured by KES-FB. The SPL, Loudness(Z) values increased while Sharpness(Z) value decreased. In the physical sound parameter, specimen E had the highest SPL value at low speed and specimen B at high speed. In case of Zwicker's psychoacoustic parameters, the commercially available Taekwondo uniform fabrics(E, F) showed higher values of Loudness(Z), Sharpness(Z), and Roughness(Z), that indicates they can produce louder, shaper and rougher sounds than other fabrics for Taekwondo uniforms. The decisive factors that affected frictional sounds for Taekwondo uniforms were W(weight) as well as EM(elongation at maximum load) at low speed and WC(compressional energy) at high speed.

• Journal of the Microelectronics and Packaging Society
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• v.10 no.3
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• pp.89-98
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• 2003

The electrical and mechanical properties of sputtered Cu(Mg) films are investigated for highly reliable interconnects. The roughness, adhesion, hardness and resistance to thermal stress of Cu(Mg) film annealed in vacuum at $400^{\circ}C$ for 30min were improved than those of pure Cu film. Moreover, the flat band voltage(V$_{F}$ ) shift in the Capacitance-Voltage(C-V) curve upon bias temperature stressing(BTS) was not observed and leakage currents of Cu(Mg) into $SiO_2$ were three times less than those of pure Cu. Because Mg was easy to react with oxide than Cu and Si after annealing, the Mg Oxide which formed at surface and interface served as a passivation layer as well.