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넓은 출력전압 제어범위에서 동작하는 보조스위치 적용 공통커패시터 연결 LLC 공진컨버터
오재성,김민지,이지철,김은수,전용석,국윤상 전력전자학회 2019 전력전자학회 논문지 Vol.24 No.4
A capacitor common connected LLC resonant converter with auxiliary switches for a wide output voltage control range is presented in this paper. The proposed converter can be controlled in two ways to achieve a wide output voltage control range of Vo–3Vo. The first control method is performed through pulse width modulation of the auxiliary switches and primary switching devices. The second control method is conducted through frequency modulation of the primary switching devices configured to operate in full-bridge switching modes, when the auxiliary switches are turned off. The feasibility of the proposed converter is verified by the experimental results of a 5 kW prototype.
제왕절개술을 실시한 초산부와 경산부에 대한 출산후 입원기간동안의 변화양상 고찰
오재성,조정훈,장준복,이경섭 대한한방부인과학회 2004 大韓韓方婦人科學會誌 Vol.17 No.3
Objectives : The study is to analyse the change of symptoms during the postoperative period following c/sec in primipara and multipara Method : We investigated the change of sweating, defecation, lochia, aneilema, general condition and CBC in 81 patients:32 primipara and 49 multipara from Mar. 2003 to Sept. 2003 in KMC OB&GY. Results and conclusions : This study revealed that the sweating in multipara decrease more than that in primipara, insignificantly. And it revealed that the aneilema in primipara decrease more than that in mulipara, insignificantly. The defecation, lochia and general condition had changed for the better after caserean section.
A modified perturbation/correlation method for force-guided assembly
오재성,오준호 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.12
The present study proposes the Modified perturbation/correlation method (MPCM) as a way of performing assembly tasks and an algorithmby which assembly task can be performed automatically, without human intervention. The MPCM is a method where position/orientation perturbation is generated when the female connector and the male connector are connected and the correlation value ofthe resulting reaction force/moment is used to calculate and to correct the position and orientation errors between the connectors. Thesuccessful performance of assembly task within a limited error range can be confirmed by applying the MPCM to DRC-HUBO. Whenthere are errors between the connector, the correlation value can be confirmed to converge to 0 as errors are corrected even though ittakes on certain directionality.
V2G EV 충전기(OBC)를 위한 개선된 고효율 양방향 공진컨버터
오재성,김민지,이준환,우정원,김은수,원종섭 전력전자학회 2019 전력전자학회 논문지 Vol.24 No.6
In this paper, bidirectional LLC resonant DC/DC converters with the primary auxiliary windings in transformers of resonant circuits are proposed. Although the resonant capacitors are used on both the primary and secondary sides, regardless of the direction of power flow, the main feature of the proposed converters exhibits high gain characteristics without any mutual coupling between the resonant capacitors. For one of the proposed converters, an investigation of the operating characteristics in each mode has been carried out. A prototype of a 3.3 kW bidirectional LLC resonant converter for interfacing 750 V DC buses has been built and tested to verify the validity and applicability of the proposed converter.
오재성,이소정,구남이,신동성,유경상,윤서현,조주연,장인진 한국유전체학회 2018 Genomics & informatics Vol.16 No.3
In this report, we present a case study of how pharmacogenomics and pharmacometabolomics can be useful to characterize safety and pharmacokinetic profiles in early phase new drug development clinical trials. During conducting a first-in-human trial for a new molecular entity, we were able to determine the mechanism of dichotomized variability in plasma drug concentrations, which appeared closely related to adverse drug reactions (ADRs) through integrated omics analysis. The pharmacogenomics screening was performed from whole blood samples using the Affymetrix DMET (Drug-Metabolizing Enzymes and Transporters) Plus microarray, and confirmation of genetic variants was performed using real-time polymerase chain reaction. Metabolomics profiling was performed from plasma samples using liquid chromatography coupled with quadrupole time-of-flight mass spectrometry. A GSTM1 null polymorphism was identified in pharmacogenomics test and the drug concentrations was higher in GSTM1 null subjects than GSTM1 functional subjects. The apparent drug clearance was 13-fold lower in GSTM1 null subjects than GSTM1 functional subjects (p < 0.001). By metabolomics analysis, we identified that the study drug was metabolized by cysteinylglycine conjugation in GSTM functional subjects but those not in GSTM1 null subjects. The incidence rate and the severity of ADRs were higher in the GSTM1 null subjects than the GSTM1 functional subjects. Through the integrated omics analysis, we could understand the mechanism of inter-individual variability in drug exposure and in adverse response. In conclusion, integrated multi-omics analysis can be useful for elucidating the various characteristics of new drug candidates in early phase clinical trials.
정전 분무 공정으로 제조된 Fe-Cr-Al 분말 다공체 금속의 고온 산화 특성에 미치는 기공 크기의 영향
오재성,공영민,김병기,이기안,Oh, Jae-Sung,Kong, Young-Min,Kim, Byoung-Kee,Lee, Kee-Ahn 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.1
Fe-Cr-Al powder porous metal was manufactured by using new electro-spray process. First, ultra-fine fecralloy powders were produced by using the submerged electric wire explosion process. Evenly distributed colloid (0.05~0.5% powders) was dispersed on Polyurethane foam through the electro-spray process. And then degreasing and sintering processes were conduced. In order to examine the effect of cell size ($200{\mu}m$, $450{\mu}m$, $500{\mu}m$) in process, pre-samples were sintered for two hours at temperature of $1450^{\circ}C$, in $H_2$ atmospheres. A 24-hour thermo gravimetric analysis test was conducted at $1000^{\circ}C$ in a 79% $N_2$ + 21% $O_2$ to investigate the high temperature oxidation behavior of powder porous metal. The results of the high temperature oxidation tests showed that oxidation resistance increased with increasing cell size. In the $200{\mu}m$ porous metal with a thinner strut and larger specific surface area, the depletion of the stabilizing elements such as Al and Cr occurred more quickly during the high-temperature oxidation compared with the 450, $500{\mu}m$ porous metals.
오재성,조정훈,장준복,이경섭 대한한방부인과학회 2004 大韓韓方婦人科學會誌 Vol.17 No.1
Objective : This study was conducted to investigate the effects of Cervi Pantotri chum Cornu (鹿茸) on the reproduction and in vitro developmental competence in male mice. Materials and Method : We administered the extract of Cervi Pantotrichum Cornu to 8-week and 18-week old male mice, once a day for 8 days. And we observed the count, the motility and the morphology of epididymal sperm from the male mice and in vitro fertilization and embryonic development of mouse oocytes. And also we examined the pregnancy and delivery of in vitro cultured blastocyst from the mice. Results : There was no significant difference between the sperm count of treated group and that of control group in 8-week and 18-week-old mice. But the motility and morphology of epididymal sperm of treated group increased more than that of control group in 8-week and 18-week-old mice. The rate of the rate of fertilization in vitro and embryonic development of mouse oocytes of treated group increased more than that of control group in 8-week and 18-week-old mice. But the only morphologic change of epididymal sperm in 8-week old mice is statistically significant. There was no significant difference between the rate of pregnancy and delivery of in vitro cultured blastocyst from mice of Cervi Pantotrichum Cornu treated group and that of control group in both 8-week and 18-week old mice. Conclusion : The result of this study had no statistically significance for a few number of experiment mice but shows that Cervi Pantotrichum Cornu has a effect on the motility, morphology of epididymal sperm from the male mice and in vitro fertilization and embryonic development of mouse oocytes. It is concluded that Cervi Pantotrichum Cornu has a effect on the improvement of virility in men.