• Journal of The Korean Association of Information Education
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• v.2 no.2
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• pp.245-251
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• 1998

This paper designs RDL/PAL interface and performance monitoring tool with providing the Event Expressions. RDL/PAL suggests interface of instrumentation layer and performance analysis layer so that it can extract event data from various trace formats. Also, the Event Expressions is similar to the normal program language, which make possible to obtain result of performance analysis. The programmer can analyze performance regardless of trace format by using the performance monitoring tool which has so much merits.

• Proceedings of the KIEE Conference
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• 1999.07f
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• pp.2773-2775
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• 1999

포항가속기의 선형가속기 buncher 및 prebuncher 시스템은 가속기 건설 시에 중국의 IHEP로부터 도입된 것이다. 전체적인 시스템은 완성되었으나, 그 동안 몇 가지의 문제점이 있어, 제한된 조건하에서 사용해왔다. 이와 같은 문제점을 해결하여 선형가속기 기계장치를 이용한 연구를 활성화하고 보다 나은 전자빔을 공급해주기 위하여 일부 기계장치를 포함한 모터 및 구동부, 제어부등에 대한 성능개선을 하였고 현장 시험과 설치를 완료하였다. 특히 모터는 설치가 간단하고 정밀한 제어를 할 수 있는 5선 식 5상 스텝 모터를 사용하였고, 구동부는 MOSFET을 이용한 정 전류 초핑 방식을 채택하여 크기와 발열량을 줄였다. 그리고, 제어부는 4축의 독립된 유닛이 단일의 RS485 직렬 접속에 의해서 원격으로 제어가 가능하도록 구성하였다.

• Proceedings of the Korean Nuclear Society Conference
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• 2005.05a
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• pp.895-898
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• 2005

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.106-108
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• 2005

High accuracy and stability digital controlled power supply for magnet is developed at PLS. This power supply has three sections. The first section is digital controller including DSP&FPGA and precision ADC, the second section consists of IGBT driver and four quad IGBT switch, and the third section is LC output filter section. AC input voltage of power supply is 3-phase 21V, output current is 0 ${\sim}$ 150 A dc. Switching frequency of four quad IGBT switch is 25 kHz. The output current of power supply has very high accuracy of 100 A step resolution at full range and the stability of +/- 1.5 ppm for short term and +/- 5 ppm for long term. This paper describes characteristics of filter and output current performance improvement after LC output filter at four quad digital power supplies.

• Journal of Periodontal and Implant Science
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• v.27 no.3
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• pp.525-532
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• 1997

The purpose of this study was to evaluate the extent and predictability of periodontal regeneration with barrier membranes in deep infrabony defects. 25 patients(40% smokers) were included in this study. Fourty-one deep infrabony defects treated with membranes(PPD>6mm) were evaluated 1 year postoperatively following a plaque control regimen. Probing pocket depth(PPD), gingival recession(REC), and probing attachment level(PAL) were evaluated at baseline and postoperative 1 year. Plaque score at baseline was 16.2 and plaque score at 1 year was 9.9 A PAL gain of $4.1{\pm}2.5mm$ along with a PPD reduction of $5.0{\pm}2.3mm$ were observed. A PAL gain of $4.1{\pm}2.5mm$ was observed at the smoking group and a PAL gain of $4.0{\pm}2.5mm$ was observed at the non-smoking sroup. It was concluded that periodontal regeneration with membrane represented the predictable and effective treatment modality in the deep infrabony defects.

• Proceeding of EDISON Challenge
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• 2013.04a
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• pp.203-204
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• 2013

Phenylalanine Ammonia Lyase (PAL)는 phenylalanine의 산성도가 더 큰 ammonium hydrogen 과는 반응하지 않고 그것의 nonacidic ${\beta}$ proton을 제거하는 역할을 한다. Phenylalanine은 electrophilic 그룹을 갖고 있으며 지난 30 여년 동안 phenylalanine의 electrophilic 그룹이 PAL의 반응 기작에 중요한 역할을 한다고 믿어왔다. 그러나 최근 X-ray와 UV spectroscopy를 통하여 상당히 electrophilic 한 5-methylene-3,5-dihydroimidazol-4-one (MIO) 그룹이 발견되었다. 이전의 연구들은 실험을 통하여 MIO와 관련된 electrophile에 의한 Friedel-Crafts Attack 메커니즘과 electrophile에 대한 nucleophilic addition 메커니즘을 제시하였으며, 본 연구진은 양자계산을 통하여 두 가지 메커니즘의 에너지 차이를 살펴봄으로써 더욱 합리적인 메커니즘을 제시, 규명하고자 한다. 본 연구에서는 특히 electrophile에 대한 nucleophilic addition 메커니즘에 대하여 양자계산을 이용하여 반응물, 생성물, 전이상태의 분자 구조를 제시하고 반응이 일어나는데 필요한 에너지를 계산하고자 한다.

• Proceedings of the KIEE Conference
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• 2005.07c
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• pp.2199-2201
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• 2005

High voltage power supply with pulse load($4.5{\mu}s$ and PRF 60Hz) condition is investigated which is of interest for applications like Klystron modulator power supplies with output voltage of 50kV. The performance specifications with this type of power supplies are very stringent demanding tight regulation(<0.01%) and high efficiency(> 85%). The solution to this problem as a single stage converter is very difficult. The final output voltage is obtained as sum of the output of SCPS & PCPS. The combination of the two stages can satisfy the pulse load specifications. The analysis of the voltage and power division between SCPS & PCPS has been done for the proposed topology. It has studied under various operating conditions of line and load. Simulation results are validated by experimental results.

• Journal of the Korean Solar Energy Society
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• v.30 no.2
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• pp.33-38
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• 2010

The perimeter zone is space which receives a significant effect of ambient condition, it is necessary to improve the thermal performance in order to building energy saving. For this reason, a lot of study about the active approach is being performed, such as perimeter-less air conditioning system. But the performance of the perimeter zone is necessary to improve, through the passive approach. Therefore, the purpose of this study is to provide basic materials of energy-saving design of perimeter zone, based of the PAL that simulation changing the thickness of insulation and the rate of windows.

• Korean Journal of Microbiology
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• v.32 no.3
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• pp.186-191
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• 1994

The origin of the leading strand replication (ori) and of lagging strand replication (M-O) of R-plasmid pSBK203 was identified and its base sequence was determined. About 50 bp of ori sequence residues overlapped with the structural gene of rep. Sequence comparison reveals that pSBK-ori shares obvious identities with those of pT181 family and consists of two regions, one is conserved and the other is variable region. Of two palindrome sequence located one after another in upstream region of rep gene, palA' instead of palA which shares sequence homology with diverse family of plasmids such as pOX6, pC194, and pE194 seems to act as a signal for conversion of primarily replicated ssDNA to dsDNA (minus origin (M-O)).

• Journal of Pharmaceutical Investigation
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• v.36 no.6
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• pp.355-361
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• 2006

Intraarticular corticosteroid injections for therapy of rheumatic arthritis are administered with the aim of optimal local anti-inflammatory effect at the injection site. Since the side effects of corticosteroidal drug, dexamethasone(DEX), administered at hish dose limited the therapeutic efficacy, there was a need to design a new drug delivery system for controlled release of dexamethasone. As a prodrug for continuous therapeutic efficacy, dexamethasone-21-palmitate(DEX-PAL) was prepared via esterification of palmitoyl chloride and dexamethasone. DEX-PAL was identified by NMR and MASS analysis. DEX-PAL or DEX was entrapped in lipid nanosphere which could be prepared by using a self emulsification-solvent evaporation method. Physicochemical characteristics such as mean particle diameter, zeta potential and drug loading efficiency of the lipid nanospheres were investigated with variation of either the kind of lipid or the lipid composition. The lipid nanospheres had a mean diameter $83{\sim}95$ nm and DEX-PAL loading efficiency of up to 95%. The drug loading efficiency increased with the increase of aliphatic chain length attached to the phospholipid. The incorporation of cationic lipid was very efficient for both reducing particle size of lipid nanospheres and enhancing drug loading efficiency. The lipid nanospheres containing DEX-PAL may be a promising novel drug carrier for the controlled release of the poorly water-soluble drugs.