기판 열처리에 따른 (Pb, La)TiO₃박막의 유전 특성

박정흠,마석범,박창엽 연세대학교 산업기술연구소 2001 논문집 Vol.33 No.1

(Pb0.72 La0.28)TiO3 thin films were fabricated on the Pt/Ti/SiO2/Si substrated by sol-gel processing. The spin-coated PLT films were sintered at 750℃ for 5min by rapid thermal annealing(RTA). The structural and electrical properties of the PLT thin films deposited annealed and non-annealed substrate were discussed. (Pb0.72 La0.28)TiO3 thin films on substracte annealed at 650[℃], 30[min], had (111) prefer-orientation and high dielectric constant of 1400. We concluded that this (111) prefer-orientation was induced by intermetallic Pt3Ti seed on annealed substrate. Leakage current densities of PLT films thicker than 3300□ were less than 10-7 [A/㎠] order at electric field 150[kV/cm]

정신분열증 환자와 우울증 환자의 MMPI-2 프로파일

고윤화,손용훈,윤정흠,오상우,이귀행,박민철 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2

Background: Minnesota multiphasic personality inventory-2(MMPI-2) is superior to its predecessor in differential diagnosis. this study was to investigate MMPI-2 profiles of the patients with schizophrenia and depression and to discriminate among two groups. Methods: The sample consisted of 35 patients with schizophrenia(male 24, female 11), 35 patients with depression(male 18, female 17) diagnosed by the diagnostic and statistical manual of mental disorders(DSM-IV) for schizophrenia & depression at department of neuropsychiatry in WonKwang University from January 2005 to December 2007. The data from the results were analyzed statistically by t-test and discriminant analysis. Results: The results were as follows. First, according to t-test results the comparison of schizophrenia patients and depression patients in MMPI-2 among two groups showed significant differences; the validity scales: F, F(P); The clinical scales: D, Pa; The restructured clinical scales: Rcd(dem), RC4, RC6, RC8; The content scales: ANX, DEP, BIZ; The supplementary scales: AGGR, PSYC, Mt, GF, O-H. Second, as a results discriminant analysis, BIZ, D were significant predictors in distinguishing patients with schizophrenia from patients with depression. Third, probability to be discriminated schizophrenia in schizophrenia was 91.4%, probability to be discriminated depression in depression was 85.7%. Conclusion: Finally, we remind readers that although the MMPI-2 may prove to be useful in the task of differential diagnosis, it should be used only in combination with other patient information. 배경: MMPI-2는 감별진단에서 기존의 MMPI 보다 더 우수하다. 본 연구는 정신분열증 환자와 우울증 환자의 MMPI-2 프로파일과 두 집단을 판별하는 연구를 하였다. 방법: 2005년 1월부터 2007년 12월까지 원광대학교 병원 신경정신과에서 정신분열증과 우울증으로 진단된 정신분열증 환자 35명(남성 24명, 여성 11명), 우울증 환자 35명(남성 18명, 여성 17명)이 본 연구에 참여하였다. 자료는 t-검증과 판별분석으로 분석하였다. 결과: 결과는 다음과 같다. 1. t-검증 결과, 두 집단간 유의미한 차이를 보인 척도들로는 타당도 척도에서 F, F(P) 척도, 임상척도에서 D, Pa, 척도, 재구성 임상척도에서 Rcd(dem), RC4, RC6, RC8척도 였다. 내용척도에서는 ANX, DEP, BIZ척도 였으며 보충척도에서는 AGGR, PSYC, MT, GF O-H척도 였다. 2. 판별 분석 결과로서, 정신분열증과 우울증을 구별하는데 가장 유의한 예언요소는 BIZ, D척도로 나타났다. 3. 판별함수를 통한 진단율은 정신분열증을 정신분열증으로 판별해주는 정확도는 91.4%였고, 우울증을 우울증으로 판별해주는 정확도는 85.7%였다. 결론: 본 연구 결과를 통해서 MMPI-2가 두 집단을 감별하는데 유용하다고 증명되었을지 모르지만 더욱 정확하게 감별하기 위해서 환자의 기타 정보를 사용해야 할 것이다.

경추 후종인대 골화증의 수술적 치료

김영수,진동규,조용은,진병호,윤영설,박정필,윤도흠 대한신경외과학회 1997 Journal of Korean neurosurgical society Vol.26 No.9

High morbidity in myocardial infarction and heart failure patients after gastric cancer surgery.

Jeong, Sang-Ho,Kim, Young-Woo,Yu, Wansik,Lee, Sang Ho,Park, Young Kyu,Park, Seong-Heum,Jeong, In Ho,Lee, Sang Eok,Park, Yongwhi,Lee, Young-Joon WJG Press 2015 WORLD JOURNAL OF GASTROENTEROLOGY Vol.21 No.21

<P>To evaluate to morbidity and mortality differences between 4 underlying heart diseases, myocardial infarction (MI), angina pectoris (Angina), heart failure (HF), and atrial fibrillation (AF), after radical surgery for gastric cancer.</P>

Long-term oncologic outcomes in pathologic tumor response after neoadjuvant chemoradiation for locally advanced rectal cancer

Jeong-Soo Park,Jeong-Heum Baek,Won-Suk Lee,Jun-Young Yang,Woon-Kee Lee,Kun-Kuk Kim,Yeon-Ho Park 대한종양외과학회 2018 Korean Journal of Clinical Oncology Vol.14 No.1

Purpose: The status of tumor regression in rectal cancer after neoadjuvant concurrent chemoradiotherapy (CCRT) has significant effect on tumor recurrence and patient survival. The aim of this study was to evaluate the long-term oncologic outcomes of rectal cancer patients presenting complete response or down-staging of rectal cancer compared to patients with non-response after neoadjuvant therapy in advanced mid-to-lower rectal cancer. Methods: We retrospectively reviewed 79 patients with stage II/III mid-to-lower rectal cancer following neoadjuvant CCRT between March 2003 and April 2012. Patients were classified into three groups according to down-staging tumor response after neoadjuvant CCRT: complete response group (CRG), partial response group (PRG), and non-response group (NRG). Results: Of the 79 patients in the study, eight (10.1%), 31 (39.2%), and 40 (50.7%) were classified as CRG, PRG, and NRG, respectively. Median follow-up period was 57 months. There was significant difference in local recurrence (P=0.012) between the three groups, yet there was no significant difference in overall survival (CRG, 100%; PRG, 82.5%; NRG, 74.0%; P=0.244). There was a significant difference in disease-free survival (CRG, 100%; PRG, 90.1%; NRG, 57.7%; P=0.006). Conclusion: Tumor response with complete response or down-staging provided better oncologic outcomes in terms of disease-free survival and local recurrence in locally advanced rectal cancer patients.

Implementation of Tuneable Filter Using CPW Coupled Line and Varactor Diode

Park, Jeong-Heum The Korean Institute of IIIuminating and Electrica 2006 조명·전기설비학회논문지 Vol.20 No.9

This study investigated a new tuneable bandpass filter based on coplanar waveguide coupled line structure, and using the varactor diode for tuning the center frequency of the filter. The filter was designed by a commercial simulator and had a tuning range of 180[MHz] from 0.95[GHz] to 1.13[GHz]. The filter acceptable values regarding the insertion loss was less than 3[dB] and its return loss greater than 12[dB]. The figure of merit of the implemented tuneable filter increased with the reverse bias voltage up to 14[V] on the varactor diode. The proposed filter has a promising future as it can be used in integration processes and in various materials as substrate.

Asian Society of Gynecologic Oncology International Workshop 2014

Park, Jeong-Yeol,Ngan, Hextan Yuen Sheung,Park, Won,Cao, Zeyi,Wu, Xiaohua,Ju, Woong,Chung, Hyun Hoon,Chang, Suk-Joon,Park, Sang-Yoon,Ryu, Sang-Young,Kim, Jae-Hoon,Cho, Chi-Heum,Lee, Keun Ho,Lee, Jeong Asian Society of Gynecologic Oncology; Korean Soci 2015 Journal of Gynecologic Oncology Vol.26 No.1

<P>The Asian Society of Gynecologic Oncology International Workshop 2014 on gynecologic oncology was held in Asan Medical Center, Seoul, Korea on the 23rd to 24th August 2014. A total of 179 participants from 17 countries participated in the workshop, and the up-to-date findings on the management of gynecologic cancers were presented and discussed. This meeting focused on the new trends in the management of cervical cancer, fertility-sparing management of gynecologic cancers, surgical management of gynecologic cancers, and recent advances in translational research on gynecologic cancers.</P>

Implementation of Tuneable Filter Using CPW Coupled Line and Varactor Diode

Jeong-Heum Park 한국조명·전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.9

This study investigated a new tuneable bandpass filter based on coplanar waveguide coupled line structure, and using the varactor diode for tuning the center frequency of the filter. The filter was designed by a commercial simulator and had a tuning range of 180[㎒] from 0.95[㎓] to 1.13[㎓]. The filter acceptable values regarding the insertion loss was less than 3[㏈] and its return loss greater than 12[㏈]. The figure of merit of the implemented tuneable filter increased with the reverse bias voltage up to 14[V] on the varactor diode. The proposed filter has a promising future as it can be used in integration processes and in various materials as substrate.

UHF RFID 시스템으로부터의 저전력 RF 에너지 하베스팅

박정흠(Jeong-Heum Park) 한국조명·전기설비학회 2009 조명·전기설비학회논문지 Vol.23 No.1

본 논문에서는 에너지 하베스팅의 일환으로 상용의 RFID시스템의 리더 안테나에서 방사되는 RF에너지를 활용하여 무선센서노드의 전원부를 구성하고자 하였다. 이를 위해 렉테나(Rectenna)를 구성하고 효율이 높은 부스트 컨버터를 구성하여 RF전력으로부터 배터리를 충전할 수 있는 DC전력을 얻도록 하였다. RFID 안테나로부터 1.2[W] RF출력 시, 구현된 렉테나로 1[m]거리에서 3.1[㎽], 5.5[m]에서 1[㎽]정도의 전력을 얻을 수 있었다. 배터리와 연결 시 변환효율을 높이기 위한 부스트 컨버터의 특성은 4[m]거리에서 변환효율 79.3[%], 실제 변환되어 배터리를 충전할 수 있는 전력은 1.36[㎽]를 얻을 수 있었으며, 이 값은 무선센서노드로 응용이 가능한 값이다. In this paper, the power management module of wireless sensor node is designed and fabricated utilizing RF energy from reader antenna of commercial RFID system, which is mainly categorized in the energy harvesting. For this, the rectenna and the high efficient boost converter is designed to get the DC power from RF power for the charging the battery. When the RF power from RFID reader antenna is 1.2[W], the DC power of 3.1[㎽] at the distance of 1[m] and 1[㎽] at 5.5[m] are obtained. Considering the connection to the battery, the boost converter for enhancing the conversion efficiency is designed. The conversion efficiency at the distance of 4[m] is 79.3[%] and the harvested power is 1.36[㎽] which is actually used for the charging the battery. This value is avaliable in the wireless sensor networking.

유도성 전력 전송 시스템에서의 코일 간 상호 인덕턴스 모델링

박정흠(Jeong-Heum Park) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.6

Among the various methods of wireless power transmission using the near and field of electromagnetic energy, the most realistic method is the inductive power transfer (IPT) method. This method has a higher transmission efficiency and minimizes the influence of electromagnetic waves on the human body as compared with other methods, and has attracted attention as a method most likely to be commercialized in wireless charging of electric vehicles. In this paper, the coupling coefficient and mutual inductance between the Tx-Rx loop coils are modeled and the efficiency of the system is calculated using mathematical analysis in the near field using IPT system. As a result, it is confirmed that the measured value of efficiency at actual IPT system is in good agreement with the calculated one, so this analysis method can be applied to the design and the optimization of the distance of the coil at the IPT system for wireless charging of electric vehicles.