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정재승 한국정신과학학회 1997 韓國精神科學學會誌 Vol.1 No.2
전통 선도수련법에서는 복기법, 복약법, 연형법은 그 중심을 이루는 3대 수련법이다 본고에서는 복약법을 중심으로 다루었다 복약법이란 입으로 먹을 수 있는 모든 약물이나 음식물 등을 통해 힘과 기운을 얼고 그것을 내, 외공 수련의 원동력 내지는추진력으로활용하는방법이라할수있다. 또한 복약신화에 대한 잘못된 관점을 바로잡고, 갈홍의 저서인 ”신선전”을 기본으로 역사속에서 내려온 갖가지의 복약법과 조제방법을 살펴본다. 그러고 "통의보감" 을 중심으로 한국선도의 복약법을 고찰하고 국내에서 집안대대로 내려오는 몇몇 집안의 조제법을 소개 한다.
민족정신 수련법에 나타난 의식개발과 심신의학 : 《용호결(龍虎訣)》과 《원상법(原象法)》을 중심으로
정재승 한국정신과학학회 2001 한국정신과학회 학술대회 논문집 Vol.15 No.-
《용호결》은 조선조 단학파(丹學派)의 거두(巨頭)인 북창(北頭) 정렴의 수련서로서 중세 이후 한국 선가(仙家) 수련의 가장 중요한 교과서로 자리하였으며 수많은 선도수련 학인들의 실천적 나침반 역할을 하였다. 《용호결》서론은 인간의 질병 원인에 대한 선도 의학적 관점을 명시하고 선도 수련을 통한 근원적 치유방법을 제시해 놓고 있다. 이러한 관점은 후일 허준의 《동의보감》 서술의 사상적 토대가 되었던 것으로 밝혀졌다 《동의보감》에 깔린 의학사상의 기조가 16세기 조선조 단학파들의 선도사상이었음은 이미 드러난 사실이다. 북창 仙人은 《용호결》 의 본론을 폐기(閒氣), 태식(胎息), 주천화후(周天火候)의 세 장으로 서술하면서 여러 부분에 걸쳐 단학수련 과정상 나타나는 의식개발 및 심신의학적 요소들을 언급하고 있다.
정재승,서원익,오철규,김성철,박명찬,박상현,유지형,이찬호,김완석,박태용,민권식,정재일 대한비뇨의학회 2020 Investigative and Clinical Urology Vol.61 No.1
Purpose: Preoperative use of 5α-reductase inhibitors (5ARIs) may cause fibrosis of the prostate tissue and reduce the efficiency of thulium laser surgery for treating benign prostate hyperplasia (BPH). Thus, we investigated the effects of preoperative 5ARI use in this setting. Materials and Methods: This retrospective study examined 184 patients who underwent thulium laser surgery for BPH during 2012–2017. Patients were grouped according to their 5ARI use in order to compare their preoperative and intraoperative characteristics and subsequent outcomes. Surgical efficiency was assessed using vaporesection efficiency. The total operation time, vaporesection time and prostate volume change were measured. Results: The 5ARI+ group included 83 patients (45.1%) and the 5ARI− group included 101 patients (54.9%). There were no significant differences in the two groups' preoperative characteristics, postoperative prostate size, thulium laser energy use, or prostate volume reduction rate. However, relative to the 5ARI− group, the 5ARI+ group had a significant shorter total operative time (65.0 min vs. 70.0 min, p=0.013) and a significantly shorter vaporesection time (48.0 min vs. 54.0 min, p=0.014), which resulted in significantly higher vaporesection efficiency in the 5ARI+ group (0.66 mL/min vs. 0.51 mL/min, p<0.001). Both groups exhibit significant improvements in their quality of life score and International Prostate Symptom Score during the 12-month follow-up. Conclusions: In contrast with our expectations, the preoperative use of 5ARI increased the efficiency of thulium laser surgery for BPH. Thus, it may not be necessary to stop 5ARI treatment before performing thulium laser surgery in this setting.
정재승,최영득,최한용,송해령,변석수,서성일,송채린,조진선,이상은,안한종,이은식,황태곤,김원재,정문기,정태영,유호송 연세대학교의과대학 2011 Yonsei medical journal Vol.52 No.1
Purpose: Due to the availability of serum prostate specific antigen (PSA) testing, the detection rate of insignificant prostate cancer (IPC) is increasing. To ensure better treatment decisions, we developed a nomogram to predict the probability of IPC. Materials and Methods: The study population consisted of 1,471 patients who were treated at multiple institutions by radical prostatectomy without neoadjuvant therapy from 1995 to 2008. We obtained nonrandom samples of n = 1,031 for nomogram development, leaving n = 440 for nomogram validation. IPC was defined as pathologic organ-confined disease and a tumor volume of 0.5 cc or less without Gleason grade 4 or 5. Multivariate logistic regression model (MLRM) coefficients were used to construct a nomogram to predict IPC from five variables, including serum prostate specific antigen, clinical stage, biopsy Gleason score, positive cores ratio and maximum % of tumor in any core. The performance characteristics were internally validated from 200 bootstrap resamples to reduce overfit bias. External validation was also performed in another cohort. Results: Overall, 67 (6.5%) patients had a so-called “insignificant” tumor in nomogram development cohort. PSA, clinical stage, biopsy Gleason score, positive core ratio and maximum % of biopsy tumor represented significant predictors of the presence of IPC. The resulting nomogram had excellent discrimination accuracy, with a bootstrapped concordance index of 0.827. Conclusion: Our current nomogram provides sufficiently accurate information in clinical practice that may be useful to patients and clinicians when various treatment options for screen-detected prostate cancer are considered.
DSRC(Dedicated Short Range Communication) Physical Layer 성능 분석
정재승,이병섭,오현서,임춘식 한국전자파학회 2000 한국전자파학회논문지 Vol.11 No.2
본 논문은 ISO TC-204 WG-15에서 표준화를 다루고 있는 DSRC 물리 계층에서의 성능 분석 및 향상에 관해 다루었다 .. DSRC는 노변(RSU)←차량(OBE)간 거리가 100m 이하인 단거리 무선통신이며, 값싸고 저렴한 변조기 술이 요구되는데, 국내에서는 PSK. FSK. ASK 중에서 ASK가 표준 변조 방식으로 시스템이 개발되고 있다 본 논문은 개발 초기 단계에 있는 DSRC 물리계층 시스템의 라이시안 페이딩 채널하의 변조 방식별 성능 분석을 통하여 ASK 방식의 타당성 및 성능 한계성을 검증하고 아울러 성능향상을 위한 등화기 및 안테나 다이버시티 기법을 제시하고 이에 따른 성능 향상 효과를 시율레이션을 통하여 보여준다. This paper treats performance analysis and improvement of DSRC physical layer which is discussed for standardization at the ISO TC-204 WG-15. DSRC is a short range wireless communication for which distance is less than 100m between RSU and O BE, since DSRC requires cheap and simple modulation technique, ASK is being developed as standard modulation system among PSK, FSK and ASK in our country. This paper analyzes the performance of DSRC physical layer system which is at the first stage of development under Rician fading channel, more sepcifically, the validity of the system and the performance limitations are shown. Both equalizer and antenna diversity techniques are simulated to improve the ASK system performance.
정재승,이현우 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
We study a multichannel spin field-effect transistor (SFET) in the presence of impurities and external magnetic fields, with special attention to the electronic coherence. Scattering by isotropic and spin-independent impurities is considered in the weakly diffusive regime. The conductance modulation of the SFET as a function of the Rashba spin-orbit coupling strength is numerically calculated via a recursive Green's function method using the tight-binding approximation of the Hamiltonian. We show that a scatering-induced phase-locking, reported previously [H.-W. Lee, S. Calskan, and H. Park, Phys. Rev. B 72, 153305 (2005)] for a single-channel SFET, persists for a multichannel SFET.