http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
분극전계가 모포트로픽 상경계 부근의 PZT 세라믹스의 공진주파수의 온도의존성에 미치는 영향
梁正普(Jung-Bo Yang),梁完碩(Wan-Seok Yang),李開明(Gae-Myoung Lee) 대한전기학회 2008 전기학회논문지 Vol.57 No.7
Poling is an important process in fabricating PZT ceramic devices such as filters and resonators and activates piezoelectricity to sintered PZT ceramics. Tolerance of the operating frequency of these devices is tightly required in applications. And a factor to attribute the tolerance is the temperature dependence of the resonance frequency of PZT ceramics. In this paper the relationship of poling strength and temperature dependence of resonance frequency of PZT specimens was studied. The Pb(Zr0.53Ti0.47)O₃ ceramics were fabricated and the poling strengths were chosen to be 0.5, 1.5, 2.5 and 3.5 [㎸/㎜]. The dielectric constant of the specimen poled in poling strength 0.5 [㎸/㎜] was less than that of unpoled specimen and the specimen poled in higher electric field had the higher dielectric constant. (002) peak in X-ray diffraction patterns of the specimens increased as poling strength increased. And the change of resonance frequency of the specimens according to the variation of temperature was measured. Resonance frequency of all specimens increased as the temperature increased. The specimen poled in higher electric field had the smaller positive temperature coefficient of resonance frequency. The effect that temperature coefficient of resonance frequency becomes smaller is obtained when Zr mole in PZT composition equation increase. Controlling the poling strength is believed to be a method to adjust the temperature stability of resonance frequency of the PZT ceramic devices.
양정보 ( Jung Bo Yang ),강병헌 ( Byung Hun Kang ),고영복 ( Young Bok Ko ),박찬준 ( Chan Joon Park ),유헌종 ( Heon Jong Yoo ),이윤이 ( Yun Ee Lee ),강길전 ( Kil Chun Kang ),노흥태 ( Heung Tae Noh ) 대한산부인과학회 2004 Obstetrics & Gynecology Science Vol.47 No.12
Objective : To assess several variables that are known as the risk factor of preeclampsia. Methods : We have studied with 279 pregnant women who were diagnosed with preeclampsia and went through delivery in Chungnam University from January, 1998 to Decemb
김보연 ( Bo Youn Kim ),양정보 ( Jung Bo Yang ),이민아 ( Min A Lee ),고영복 ( Young Bok Ko ),이기환 ( Ki Hwan Lee ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.2
Vesicovaginal fistula (VVF) is one of the most serious surgical complication in gynecologic surgery. Surgical approach to repair this condition can be performed by transvaginal or transabdominal. However, laparoscopic repair of VVF may be an alternative surgical method. We present four cases of VVF treated with transperitoneal laparoscopic technique. Laparoscopic repair is a feasible, safe and efficacious minimally invasive approach for the management of VVF. We believe that this method provides excellent results and may result in lower morbidity, shorter hospital stay, and quicker recovery than the abdominal or transvaginal approaches.
현석환 ( Suk Hwan Hyun ),양정보 ( Jung Bo Yang ),박상도 ( Sang Do Park ),이종선 ( Jong Seon Lee ),이기환 ( Ki Hwan Lee ) 대한산부인과학회 2007 Obstetrics & Gynecology Science Vol.50 No.1
Vaginal evisceration is a rare but life threatening complication of gynecologic surgery. Most of them occur after abdominal or vaginal hysterectomy. The incidence after laparoscopic hysterectomy is unknown. The incidence of evisceration in the patients undergoing laparoscopic hysterectomy in our hospital was 0.1 %. The rapid recovery after laparoscopic hysterectomy, compared with abdominal hysterectomy, is widely acknowledged. Swift return to everyday activities and early resumption of intercourse could predispose to rupture of vaginal vault. Upon discharge, patients undergoing laparoscopic hysterectomy should be given careful instructions to avoid coitus until complete healing of vaginal vault. We described three cases of vaginal evisceration after laparoscopic hysterectomy including a review of the literature.
글루코스와 피부르산염의 농도가 조절된 DMEM과 Vero 세포를 이용한 무혈청 적응용 배양액의 개발에 관한 연구
김주환 ( Ju Hwan Kim ),서영석 ( Young Seok Seo ),송해범 ( Hai Bun Song ),양정보 ( Jung Bo Yang ),이경은 ( Kyung En Lee ),이기환 ( Ki Hwan Lee ) 대한산부인과학회 2010 Obstetrics & Gynecology Science Vol.53 No.2
Objective: The purpose of this study was to examine in vitro development of early preimplantation mouse embryos in various kind of serum-free conditioned media (SF-VCM) manufactured from DMEM cultured with Vero Cells. Methods: A total of 846 two-cell mouse embryos were cultured in different kind of SF-VCM. SF-VCMs were divided into SF-VCM-10, -30 and -50 by media volume using DMEM #1 media, and divided into SF-VCM #1, #2 and #3 by controlled concentration of glucose and pyruvate (manufactured by DMEM #1: mixed three volume of DMEM-G (DMEM with glutamine without glucose and pyruvate) and one volume of DMEM-GGP (DMEM with glutamine, glucose, pyruvate), #2: mixed same volume of DMEM-G and DMEM-GGP and #3: mixed one volume of DMEM-G and three volume of DMEM-GGP, respectively). Experimental groups were mainly added 10% SSS, and 20% hFF was added to only Control group co-cultured with Vero cells. Development of embryos was observed every 24 hours. Results between different groups were analyzed using Chi-square test, and considered statistically significant when P-value was less than 0.05. Results: In vitro developmental rate by each cleavage stages of mouse embryos cultured in SF-VCMs with a various volumes were significantly (P<0.05) higher in SF-VCM-30 (morula≤: 97.2%, Blastocyst (BL)≤: 97.2%, Hatching BL≤: 82.2%) than other groups. In the rate of development on in vitro co-culture vs. a various SF-VCMs manufactured by DMEM controlled concentration of glucose and pyruvate, Group I (SF-VCM #1) was higher than other groups in each cleavage stages (morula≤: 98.1%, Blastocyst (BL)≤: 97.1%, hatching BL≤: 81.7%, respectively). Moreover, specially, in the developmental rate into the hatching blastocyst ≤after 96 hours in vitro culture, Group I (81.7%) was significantly higher than control group (67.6%, P<0.05). Conclusion: SF-VCM #1 manufactured by volume of 30 mL DMEM #1 media cultured in vitro for 48 hours in 250 mL flask was the most effective on in vitro developmental rate of mouse preimplantation embryos. Therefore, it is expected that SF-VCM #1 has application to human IVF-ET.
이민아 ( Min A Lee ),현석환 ( Suk Whan Hyun ),황순호 ( Soon Ho Hwang ),신관섭 ( Kwan Seop Shin ),양정보 ( Jung Bo Yang ),이진구 ( Jin Goo Lee ),손성경 ( Sung Kyong Son ),이윤이 ( Yun Ee Rhee ) 대한산부인과학회 2006 Obstetrics & Gynecology Science Vol.49 No.10
Meckel Gruber syndrome consisting of an occipital encephalocele, polycystic kidney disease and polydactyly is a rare autosomal recessive disorder with a recurrence risk of 25%. Targeted ultrasonography in late embryonic or early fetal stages of pregnancy has great importance in diagnosis and management of affected pregnancy in high risk groups due to incomplete genetic mapping of meckel syndrome gene (MKS). We present a case of prenatal diagnosis at 14 weeks` gestational age of Meckel Gruber syndrome in a woman, who experienced same disorder in her previous pregnancy.
불임을 동반한 중증 자궁내막증 환자에서 수술 후 임신에 미치는 요인에 관한 연구
유헌종 ( Heon Jong Yoo ),고영복 ( Young Bok Ko ),박찬준 ( Chan Jun Park ),김도영 ( Do Young Kim ),양정보 ( Jung Bo Yang ),신관섭 ( Kwan Seop Shin ),현석환 ( Suk Hwan Hyun ),황순호 ( Soon Ho Hwang ),이기환 ( Ki Hwan Lee ),강길전 ( 대한산부인과학회 2005 Obstetrics & Gynecology Science Vol.48 No.9
MRKH 증후군에서 골반복막피판을 이용한 복강경보조 질 성형술 6예
박상도 ( Sang Do Park ),이종선 ( Jong Seon Lee ),이건우 ( Geon Woo Lee ),이경은 ( Kyung Eun Lee ),고영복 ( Young Bok Koh ),양정보 ( Jung Bo Yang ),이기환 ( Ki Hwan Lee ) 대한산부인과학회 2009 Obstetrics & Gynecology Science Vol.52 No.11
Vaginal agenesis is rare gynecologic condition, and the most common etiology is Mayer-Rokitansky-Kster-Hauser (MRKH) syndrome, characterized by the absence of uterus and vagina and presence of normal ovaries and tubes. In such patients, the evaluation for associated malformations as well as careful non-surgical and surgical approach are essential. The neovaginoplasty is an important issue for these patients in regard of functional and psychological standpoint. There are many options available for creation of neovagina. We report six cases of laparoscopic assisted neovaginoplasty using pelvic peritoneal flap.
500 g 이상의 거대자궁에 대한 단일공 복강경하 자궁절제술
이건우 ( Geon Woo Lee ),김장규 ( Jang Keu Kim ),신창수 ( Chang Su Shin ),최원규 ( Won Kyu Choi ),강병헌 ( Byung Hun Kang ),양정보 ( Jung Bo Yang ),고영복 ( Young Bok Koh ),이기환 ( Ki Hwan Lee ) 대한산부인과학회 2012 Obstetrics & Gynecology Science Vol.55 No.6
Objective To compare the outcomes of single port access (SPA) laparoscopic hysterectomy and conventional laparoscopic hysterectomy for the large uterus of more than 500 g. Methods Twenty-seven cases of SPA laparoscopic hysterectomy and 32 cases of conventional laparoscopic hysterectomy were retrospectively analysed. The surgery had performed by single surgeon from January 2010 to July 2011 in Chungnam National University Hospital. We compared demographic characteristics and surgical outcomes. Results There were no significant difference in patients` age, body mass index, past surgical history, postoperative additional pain control and duration of hospital stay between the two groups. Uterine weight was 706.5±363.2 g (range, 500-2,415 g) for SPA laparoscopic hysterectomy and 634.0±153.3 g (range, 500-1,130 g) for conventional laparoscopic hysterectomy and signifi cantly not different between the two groups. Operation time was signifi cantly longer in SPA laparoscopic hysterectomy than conventional laparoscopic hysterectomy (81.1±18.1 minutes vs. 67.2±16.8 minutes). Postoperative change in hemoglobin and hematocrit was statistically higher in SPA laparoscopic hysterectomy than conventional laparoscopic hysterectomy (1.9±0.9g/dL, 2.9±4.2% vs. 1.0±1.3g/dL, 6.2±2.9%, respectively). Conclusion Operation time was longer and postoperative change in hemoglobin and hematocrit was signifi cantly higher in SPA laparoscopic hysterectomy than conventional laparoscopic hysterectomy. However, SPA laparoscopic hysterectomy will replace conventional laparoscopic hysterectomy in a future with improving surgical technique.