PWM과 입상제어의 조합에 의한 교류전력 제어회로에 관한 연구

정화균,김이곤,장영학 한국조명전기설비학회 1991 조명.전기설비 Vol.5 No.2

Mostly, phase control method is used to control the single phase AC power. The phase control method has some advantages such as ease to control and simple configuration. But the retardation of firing angle causes a lagging current even if load is purely resistive. So phase control causes a lagging power factor and a low efficiency at the input side in comparing with the system without switching device. A new PWM control method which can improve these defects for single phase AC power control circuit is proposed in this paper. The performances of the single phase AC power control circuit using the proposed method was investigated theoretically. Both power factor and waveform of load current can be improved better than those of the conventional methods.

3次元 空間 電流座標에 의한 電力分析과 能動電力필터의 性能評價用 시뮬레이터 開發

나석환,최찬학,정영국,정화균 여수대학교 1993 論文集 Vol.7 No.-

The definition of traditional 2-DS power factor current and co-ordinate did not represent clearly relation to power facter in circuit with nonlinear thyristor loads. A new simulator for performance evaluation of Active Power Filter (APF) by 3-D space current co-ordinate applicale to general power system have not been developed, because reserchers were merely interested in improvement of source current waveforms by using APF or its simulator. Moreover, There was not APF simulator with power analysis capability which was developed for the better. Current was decomposed by active, reactive, distortion, by digital correlation signal proccessing techique based on Nowomiejski theory. Therefore, A new 3-D space current co-ordinate composited by 3 current components was defined in this paper. A new 3-D space current co-ordinate was shown state and location of current vector by trajectories with 3-D co-ordinate rotation. It evidently has excellent performance not only performsance evaluation method of APF but alse evaluation method of general power system, not conventional domain but other domain. By proposed 3-D soace co-ordinate, space power factor is derived, the true state of physical meaning is proved, new distortion factor was proposed, this study was proved true state of appropriation throughout development of simulator for APF performance evaluation with power analysis capability.

소아 대퇴골 간부 골절에 대한 고찰

정화재,김도영,신주호,정선균 한림대학교의료원 1994 人間科學 Vol.18 No.6

정형외과 영역의 수술 후 동통 치료에 있어서 Ketorolac tromethamine(Tarasys^(�))의 임상적 효과

정화재,정선균 최신의학사 1991 最新醫學 Vol.34 No.8

한국 성인 여성의 월경지수에 관한 연구

지현준(Hyun Jun Jee),정화경(Hwa Kyung Jung),조수용(Soo Yong Chough),박용균(Yong Kyun Park),서호석(Ho Suk Saw),오민정(Min Jeong Oh),허준용(Jun Young Hur) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.10

목적 : 우리나라 성인 여성의 월경양상과 월경과다 시 쉽게 이용할 수 있는 진단방법, 월경 과다에 대한 인식정도에 대하여 알아보고자 하였다. 대상 및 방법 : 초등학교 여교사 77명을 대상으로 정기 신체검사시 설문지를 통해 월경양상과 월경과다에 대한 인식정도를 조사하였고 그림표를 사용하여 월경지수를 계산하고 신체검사시 시행한 혈색소량을 조사 하였다. 월경지수와 혈색소량을 Spearman correlation test를 시행하여 상관관계를 알아보았다. 결과 : 조사 대상 여성들의 월경주기는 29.8일 (SD±5.1), 월경기간은 평균 5.6일 (SD±1.3)이었고, 월경지수는 평균 170 (SD±89.2)으로 12에서 411의 분포를 보였고, 혈색소량은 평균 12.3 g/dL 이었다. 월경지수와 혈색소량 간에는 통계적으로 유의하게 선형관계를 보였다 (r=-0.29, p=0.01). 혈색소량이 12 g/dL 이하로 빈혈이 있는 여성은 20명 (26%) 중 17명 (85%)과 월경지수가 200 이상으로 월경과다인 여성 26명 (34%) 중 25명 (96%)이 본인의 생리가 정상이라고 생각하고 있었다. 결론 : 월경과다나 이로 빈혈이 있는 여성들 중 많은 경우에서 심각성을 느끼지 못하고 있으므로 보다 간편하고 정확하게 여성 스스로가 월경과다를 의심하고 병원을 찾을 수 있게 하는 방법이 필요하고 그림표를 이용하여 스스로 작성하는 월경일지가 이를 위한 유용한 방법이 될 수 있다. Objective : This study was designed to evaluate the patterns of menstruation including menorrhagia using menstrual index, to find out correlations between patient`s own judgement and actual patterns of menstruation in Korean women, and to develop the menstrual diary using menstrual index as a screening of menstrual disorders. Methods : Seventy-seven women teachers of elementary school undergoing routine health screening test were asked to complete a pictorial blood loss assessment chart and a set of interview sheets regarding menstrual history and their subjective judgement on their amount of menstruation. Spearman correlation test was used to assess the correlation between menstrual index which was obtained from pictorial chart and serum hemoglobin concentration. Results : The mean menstrual intervals were 29.8 days (SD±5.1), the mean menstrual duration was 5.6 days (SD±1.3), the mean value of menstrual index was 170.3 (SD±89.2) which varied from 12 to 411, the mean serum hemoglobin concentration was 12.3 g/dL. Significant correlation was found between the serum hemoglobin concentration and the menstrual index (r=-0.29, p=0.01). Seventeen of 20 women who had anemia (serum hemoglobin concentration below 12.0 g/dL) and 25 of 26 women who had menorrhagia (menstrual index above 200) considered her menstruation as `normal`. Conclusion : Many women who have anemia due to menorrhagia are not aware of the serious consequences of menorrhagia. Writing a ‘menstrual diary` using menstrual index would be easier and more practical method in predicting menorrhagia.

일반연제 발표 : 부인종양 2 및 일반부인과 ; 한국 성인 여성의 월경지수에 관한 연구

지현준,김순규,신정호,이린화,정화경,서호석,박용균,조수용,허준용 대한산부인과학회 2001 대한산부인과학회 학술대회 Vol.87 No.-

경골 근위부 전골술을 이용한 슬관절 골성 관절염의 치료

정영기(Yung Khee Chung),정화재(Hwa Jae Jeong),정선균(Sun Kyun Jung) 대한정형외과학회 1992 대한정형외과학회지 Vol.27 No.4

자궁내막에 발생한 투명세포암 1 예

지현준(Hyun Jun Jee),정화경(Hwa Kyung Jung),조수용(Soo Yong Chough),박용균(Yong Kyun Park),서호석(Ho Suk Saw),오민정(Min Jeong Oh),허준용(Jun Young Hur) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.10

Clear cell carcinoma of the endometrium is a relatively rare malignancy that is considered to be one of the most aggressive types of endometrial carcinoma. It is an infrequent variant sharing a common Mullerian origin, accounting for 1 to 5 percent of all endometrial cancers. Histologically, these tumors consists of hobnail cells which have translucent or slightly eosinophilic cytoplasm and protrude to lumen of gland. These tumors occur predominantly in postmenopausal women and carry a relatively unfavorable prognosis comparing with other histologic types of endometrial cancer. We experienced a case of clear cell carcinoma of endometrium in a 81-year old women and this case is presented with a brief review of the literaturs.

부인과 악성종양 환자에서 복합 항암화학요법에 따른 세포독성에 대한 Amifostine 의 임상효과에 관한 연구

이린화(Lynn Hwa Lee),지현준(Hyun Jun Jee),정화경(Hwa Kyung Jung),정유아(Yu A Jung),신정호(Jung Ho Shin),오희숙(Hee Suk Oh),박용균(Yong Kyun Park),허준용(Jun Young Hur),조수용(Soo Yong Chough),서호석(Ho Suk Saw) 대한산부인과학회 2001 Obstetrics & Gynecology Science Vol.44 No.11

N/A Objective : Amifostine (Ethyol(R)), an organic thiophosphate, has shown the ability to protect normal, but not neoplastic, tissues from the damaging effects of chemotherapy and radiotherapy in various kinds of cancers. This study was designed to determine ifostine could reduce the serious hematologic and nephrologic toxicities associated with cisplatin based combination chemotherapy in gynecologic cancer patients. Patients and Methods : Forty patients who received cisplatin-based combination chemotherapy were randomized into two groups. They received chemotherapy with or without pretreatment of amifostine before each course. The occurrence of hematologic and renal toxicities were evaluated. Stastical analysis was done by independent t-test and Chi-square test. Results : Hematologic toxicity was evaluated with nadir count of neutrophil and platelet. The nadir count of neutrophil was 2034.2±1199.20/μl in group with pretreatment using amifostine vs 1070.85±472.66/μl in control group (p<0.01). Platelet count was not statistically different. (p<0.16) Grade 3 neutropenia was observed in nine (45%) patients in pretreatment group vs four (20%) patients with control group (p<0.09). Grade 4 neutropenia occurred in one patient only in control group. Renal toxicity was evaluated by serum creatinine and creatinine clearance. Protracted serum creatinine elevation was not significant in both groups. (p<0.14) Reduction of creatinine clearance was less in patients with pretreatment (p<0.01). There were no significant side reactions in subjects using amifostine. Conclusion : Pretreatment with amifostine reduces the neutropenia and nephrotoxicity associated with cisplatin-based combination chemotherapy with gynecologic cancer patients.

프랑스 지리교육사 150년의 전통과 최근 동향, 그리고 전망

이상균 ( Saang Kyun Yi ),권정화 ( Jung Hwa Kwon ) 한국지리환경교육학회 2011 한국지리환경교육학회지 Vol.19 No.2

프랑스는 국제적으로 지리 교과의 위상이 높은 것으로 알려져 있다. 그러나 현재와 같은 교육과정 상의 지위를 인정받게 된 것은 1871년 이후로서, 1870년 보불전쟁에서 패배한 국가적 위기 상황을 맞이하여 프랑스의 지도층과 교육관료들이 앞장서서 위기극복을 위한 대처방안으로서 지리교육을 강화시켰다. 국가 사회적인 관심과 지원 속에 지리교육은 제도적으로 확고한 위상을 정립하게 되었으며, 학계와 교육계의 열정적인 노력으로 지리교과는 국가교육의 핵심적 지위를 확보하게 되었다. 이러한 맥락 하에서 프랑스의 지리 교육과정은 국토애를 통한 애국심 함양, 자국 중심의 국제 정세 파악이라는 교육 목적 하에서 지역지리 중심으로 내용을 구성하여 왔으며, 1960년대까지 이러한 경향이 지속되었다. 1970년대부터 학생들의 탐구 기능 습득을 강조하는 교육 철학이 도입되면서, 계통지리가 강화되고 지역지리 학습에서 기술적 방식을 탈피하여 설명의 논리를 도입하려는 시도가 진행되어 왔다. 2008년 개정교육과정은 지역지리가 약화되고, 계통지리가 강화되었다는 점에서 큰 변화를 예고하고 있지만, 지평확대 역전 모형과 나선형 교육과정은 프랑스 지리교육의 전통으로서 최근까지 교육내용 구성의 기본 형식으로 유지되고 있다. 이는 주지주의 교육철학과 교과서 중심의 교실수업이라는 전통에 기인하는 것으로 해석된다. France is internationally known for the highest level of the geography education. Since 1871 geography education in France was firmly established on an institutional basis. In the situation of national crisis by the defeat in the Franco-Prussian War in 1870, the elite and educational officials took the lead in fostering geography education as an solution to overcome the crisis. Governmental and social support helped geography education secure an institutionally stable position, and passionate efforts by academic and educational circles enabled the subject of geography to secure a central position in national curriculum. In this context, school geography was constructed according to regional framework, for educational purposes of fostering patriotism through territorial attachment and understanding international affairs from the French perspective, this trend lasted until the 1960s. Since the early 1970s, educational philosophy emphasizing the learning skills was introduced, systematic geography was strengthened, and regional geography was transformed from the description to explain. Revised curriculum in 2008 will bring out a big change, because the regional geography was weakened, and the systematic geography was strengthened more. However, until recently Inversion model of expanded horizons and the spiral curriculum have been maintained as French tradition of geography education. This is interpreted as due to educational tradition of intellectualism and the school culture of textbookcentered classroom.