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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
목적 : 임신전, 임신중의 인구학적, 임상적 특성을 통해 전자간증을 예측할 수 있는 요소를 결정하였다. 연구 방법 : 1998년 1월에서 2002년 12월까지 충남대학교 산부인과에서 전자간증으로 진단되어 분만을 시행한 산모 279명을 환자군으로 하여 의무기록 분석을 통해 후향적 환자-대조군 연구를 시행하였다. 대조군으로는 2002년 1월에서 12월 사이에 본원에서 분만을 시행한 산모중 무작위 추출을 통해 364명을 선정하였다. 각각의 연구대상에서 나이, 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
김장규,신창수,최원규,이건우,유희준,강병헌,양정보,고영복,이민아,이기환 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-
목적: 자궁선근증은 심한 생리통과 생리과다를 일으키는 질환으로 심한 경우 삶의 질을 떨어뜨리고, 불임을 야기한다. 출산을 모두 마친 폐경전기 여성에서 자궁선근증의 치료로는 전자궁적출술이 가장 최선의 방법이겠으나, 출산 전 가임기 여성의 경우는 보존적 치료를 시행하여야 한다. 본 연구는 이중피판을 이용한 자궁선근종 절제술을 시행받은 여성에서 수술 후의 경과 및 예후를 알아보고자 시도하였다. 방법: 2008년 1월부터 2012년 6월까지 충남대학교병원에서 복강경보조 자궁선근종 절제술을 시행받은 환자들을 대상으로 후향적 연구를 시행하였다. 수술은 하복부에 미니절개를 시행하여 자궁선근종을 절제한 후 이중피판을 이용하여 자궁을 재건하였으며, 각각 환자의 수술전 생리통과 생리양을 확인하고 수술 후 생리통과 생리양의 변화를 측정하였다. 수술 전 생리통과 생리양을 10으로 하고(VAS score) 수술 후 생리통과 생리양의 변화를 1부터 10까지 숫자로 표현하였다. 결과: 수술을 시행받은 11명의 환자 모두에서 생리통의 감소(VAS score 평균 3.6), 및 생리양의 감소(VAS score 4.7)를 보였다. 수술 후 최대 2년까지 추적한 결과, 수술받은 부위의 자궁선근증의 재발은 없었으나, 3명의 환자에서 수술 받은 부위의 반대편으로 자궁선 근증 진행이 일어났다 결론: 이중피판을 이용한 자궁선근종 절제술은 자궁의 크기 감소 및 증상 완화에 효과가 있다. 그러나 자궁선근종은 재발 또는 병의 진행이 가능한 질환으로 수술 후 호르몬 유리 자궁내 피임장치나 경구피임약으로 병의 진행을 조절하는 것이 필요한 것으로 사료된다.
양한광,대한위암학회 정보전산위원회,Yang Han-Kwang 대한위암학회 2004 대한위암학회지 Vol.4 No.1
This nationwide survey was conducted to evaluate the current status of the database system on gastric cancer patients in Korea. The Information Committee of Korean Gastric Cancer Association (KGCA) sent questionnaires about the database management to all 402 KGCA members in 110 institutes. In addition, we asked them to send the gastric cancer sheet and the pathologic report of gastric cancer used in their institutes. Response rates were $18.9\%$ (76/402) for individuals and $51.8\%$ (57/110) for institutes, respectively. Most of the university hospitals responded to the questionnaire (response rate of university hospital: $74.6\%$, 44/59). A regular conference of gastric cancer and a digitalization of the database on gastric cancer patients were performed in 29 ($50.9\%$) and 43 ($75.4\%$) out of 57 institutes, respectively. MS excel was most commonly used for the digitalization of the database, followed by MS access and SPSS. A regularly formed gastric cancer sheet and pathologic report were used in 38 ($66.7\%$) and 49 ($86.0\%$) institutes, respectively. Hospital computerization, such as an Order Communicating System, an Electric Medical Record, and a Picture Archiving/Communicating System had been set up previously or would be set up in the near future in most institutes. In 25 gastric cancer sheets collected, the mean number of total items was 72.9 ($15\∼177$). Identification datafor the patients, surgical data, and pathologic data were included on most of the sheets, but preoperative status, preoperative diagnostic data, and postoperative hospital course were not.
HPLC를 이용한 양파껍질 색 및 부위에 따른 quercetin 함량 분석
맹주양,김세영,김민선,이예림,최유정,김미정,정보들,이효정,서아영,김수인,김예은,김태현 순천향대학교 기초과학연구소 2017 순천향자연과학연구 논문집 Vol.23 No.2
In this study, it was conducted to analyze of quantity of quercetin by color and area of onion skin using HPLC system. Chromatographic separation was achieved on a Capcell PAK C18 UG120 column (4.6x250 mm, 5 um particle size) and the detection was made at 360 nm. A gradient elution was programmed with the mobile phases of Acetonitrile and DW with 0.3% formic acid and a flow rate of 0.7 mL/min. The total run time was 40 min. Yellow onion and red onion were 49.2±3.2 mg/kg, 69.2±6.9 mg/kg with EtOH:DW=70:30 (v.v), respectively. EtOH:DW=70:30 (v/v) and EtOH sheowed the extraction effeiciency of solvent composition about twice as much as that of EtOH:DW=70:30 (v/v). As the extraction temperature increased, the extraction amount of quercetin increased.
GO-40 : A case of Liposarcoma like subserosal myoma with endometrial carcinoma in uterus
이연아,양정보,유헌종,이기환,고영복 대한산부인과학회 2014 대한산부인과학회 학술대회 Vol.100 No.-
Retroperitoneal sarcomas are rare neoplasms that account for only 1%-2% of all solid tumors and liposarcomas represent the most frequent histological type. We describe the case of a 53-year-old female with a liposarcoma attached uterus of 30cm* 26 cm in size. The only symptom was abdominal distension lasting for two years. The mass was excised during laparotomy and biopsy confirmed liposarcoma. We performed hysterectomy and bilateral salpingoophorectomy. Histologic finding of Uterus was endometrial adenocarcinoma limited to endometrium with grade1. Liposarcoma was well differentiated and well encapsulated. She had no further treatment. Here we review the literature about the diagnosis, treatment, and prognostic factors of this disease.