KT-1 기본 훈련기의 추진기관 비행성능 해석연구

오성환(Seong Hwan Oh),장현수(Hyun Soo Chang),기덕종(Dock Jong Ki) 한국추진공학회 2003 한국추진공학회 학술대회논문집 Vol.2003 No.10

養蜂產業의 育成方案

吳聖渙(Seong-Hwan Oh) 한국양봉학회 1988 韓國養蜂學會誌 Vol.3 No.2

남부지역 논에서 토양의 이화학적 특성 및 벼의 생산성과 미질 향상을 위한 이탈리안 라이그라스-벼 이모작 작부체계의 적용

오서영,오성환,서종호,최지수,Oh, Seo Young,Oh, Seong Hwan,Seo, Jong Ho,Choi, Jisu 한국환경과학회 2021 한국환경과학회지 Vol.30 No.8

The physicochemical properties of soil and the yield and quality of rice (Oryza sativa L. cv. Sailmi) were assessed using Italian ryegrass (Lolium multiflorum Lam. cv. Kowinearly)-rice double cropping systems in the paddy fields at Goseong and Miryang in southern Korea. The average temperatures during the ripening period were approximately 1 ℃ higher than the optimal temperature for rice ripening and the sunshine duration was reduced by frequent rainfall. Consequently, it was slightly below the optimal conditions required for rice ripening. In the soil at Goseong, winter Italian ryegrass cropping increased the pH, electrical conductivity, and the contents of organic matter, total nitrogen (T-N), available P₂O₅, K, Ca, and Mg than winter fallowing. Particularly, the contents of T-N and available P₂O₅increased significantly. In the soil at Miryang, Italian ryegrass slightly increased the electrical conductivity and the T-N, Mg, and Na contents. Therefore, winter Italian ryegrass cropping improved the physicochemical properties of paddy soils; however, Italian ryegrass-rice double cropping slightly reduced the culm length at both Goseong and Miryang, without markedly changing the panicle length or number compared to fallow-rice cropping. Furthermore, at Goseong, Italian ryegrass-rice double cropping slightly decreased the spikelet number and milled rice yield, and increased the ripened grain rate; however, at Miryang, contrasting results were observed. In addition, fallow-rice cropping revealed no differences in the head rice or opaque rice rates. The protein content was slightly increased in Italian ryegrass-rice double cropping, without significant changes in the amylose content or Toyo value, compared to that in fallow-rice cropping. The peak and breakdown viscosities were slightly decreased. These results indicate that winter Italian ryegrass cropping might alter rice taste but may not exhibit remarkable negative effects on rice cultivation. Therefore, Italian ryegrass-rice double cropping system is recommended for paddy fields in southern Korea. Nevertheless, to increase the rice yield and quality, fertilization standards for rice cropping that consider the changes in the T-N and organic matter contents in paddy fields caused by winter Italian ryegrass cropping need to be established.

남부지역 논의 사료작물-벼 이모작 작부체계에 적합한 벼 품종의 선발

오서영,오성환,서종호,최지수,Oh, Seo Young,Oh, Seong Hwan,Seo, Jong Ho,Choi, Jisu 한국환경과학회 2022 한국환경과학회지 Vol.31 No.5

To identify rice (Oryza sativa L.) cultivars suitable for Italian ryegrass (Lolium multiflorum Lam.)-rice double cropping systems, we investigated the yield and grain quality of four different midseason maturing rice cultivars ('Daebo', 'Haepum', 'Haiami', and 'Samdeog') and four midseason-to-late maturing rice cultivars ('Hyunpoom', 'Saeilmi', 'Saenuri', and 'Samkwang') in single rice cropping and Italian ryegrass-rice double cropping systems in paddy fields of Miryang, South Korea. We found that organic matter and available P₂O₅ content slightly decreased, whereas Na content increased, in the soil where Italian ryegrass was cultivated during winter compared to that in the soil that remained fallow during winter. The pH, electrical conductivity, organic matter, and contents of K⁺, Ca²⁺, Mg²⁺, and Na⁺ decreased, whereas the available P₂O₅ content slightly increased, in the soil where rice was harvested in both single and double cropping systems. However, compared to the optimum soil conditions for rice cultivation, available P₂O₅ and K⁺ content were high and Mg²⁺ content was low in both single and double cropping systems. At the heading stage, the culm length and leaf color slightly increased in most of the rice cultivars, whereas the panicle length and number slightly decreased, in the double cropped system. After harvesting, spikelet number and milled rice yield did not show a significant difference between single and double cropping systems. However, the ripened grain rate and weight per thousand grains increased slightly in the 'Saeilmi' and 'Samkwang' cultivars but remained either stable or slightly low in other cultivars in the double cropping system. The milled rice yield was high (> 500 kg/10a) in 'Daebo' and 'Haepum' among midseason maturing rice cultivars, and in 'Saeilmi' and 'Saenuri' among midseason-to-late maturing rice cultivars, in both single and double cropping systems. The head rice rate was high in midseason maturing rice cultivars in the double cropping systems, reaching > 70% in 'Haepum' and 'Haiami' cultivars, whereas it decreased in most midseason-to-late maturing rice cultivars (excluding 'Samkwang' cultivar), in double cropping systems. Particularly, it exceeded > 70% in the 'Saenuri' cultivar in both single and double cropping systems. The protein content in milled rice increased, whereas the amylose content either remained stable or slightly increased, in double cropping systems. The Toyo taste value decreased in all midseason-to-late maturing rice cultivars and slightly increased in the 'Daebo' and 'Haiami' cultivars among midseason maturing rice cultivars in double cropping systems. However, Toyo taste values in the 'Haepum', 'Haiami', and 'Saenuri' cultivars exceeding > 80% in both single and double cropping systems. Therefore, we recommend 'Haepum', 'Haiami', and 'Saenuri' cultivars as candidates for Italian ryegrass-rice double cropping systems due to high yield, head rice rate, and Toyo taste value.

남부평야지에서 적미 품종의 이앙시기에 따른 폴리페놀 함량 및 수량변이

배현경,오성환,황정동,서종호,김상열,오명규,Bae, Hyun Kyung,Oh, Seong Hwan,Hwang, Jung Dong,Seo, Jong Ho,Kim, Sang Yeol,Oh, Myung Kyu 한국작물학회 2017 한국작물학회지 Vol.62 No.3

For high-quality colored rice production, the cultivation environment is a critical factor. The major environmental factor is temperature, which includes the accumulated and average temperature during vegetative and reproductive stages. Generally, during the cultivation period, the temperature can be controlled by shifting the transplanting date. This study was carried out to determine the optimum transplanting date for high-quality red-colored rice production. Four red-colored rice varieties (Jeokjinju, Jeokjinjuchal, Hongjinju, and Gunganghongmi) were used as test materials. The transplanting dates were May 20 and June 5, 20, and 30 in 2015~2016. The most variable factor controlled by the transplanting date was the grain filling rate. The varieties transplanted on June 30 showed low yields owing to the decrease in the grain filling rate. In contrast, the polyphenol content increased with increasing delay in the transplanting date. Collectively, these two results indicate that the optimum transplanting date was June 20. The average temperature for 30 days after the heading date (30DAH) highly affected the polyphenol content. A lower temperature during the 30DAH induced higher polyphenol contents but also caused low yield. The optimum 30DAH temperature for obtaining a higher yield and polyphenol content was $22{\sim}23^{\circ}C$. Using the average 30DAH and accumulated temperatures, the optimum transplanting date was calculated as June 18 to 24 in Miryang region. The optimum transplanting date of Kyeungsangnamdo region was approximately mid-June to early July, and that of Kyeungsangbukdo region was approximately early to mid-June.

지상파 디지털 TV 방송용 송신기에서 변조기의 위상오차 보상에 관한 알고리듬 구현

오인열,양경석,이철,목하균,오성환,Oh, Inn-Yeal,Yang, Kyung-Seok,Lee, Chul,Mok, Ha-Kyun,Oh, Seong-Hwan 한국통신학회 1999 韓國通信學會論文誌 Vol.24 No.6

본 논문은 최근 지상파 디지털TV 표준 방식으로 정해진 8VSB(8 Levels Vestigial Side Band) 방식의 변조기에 관련된 내용이다. 디지털TV 시스템 개발에 있어서 가장 어려운 문제점 중 하나는 위상오차를 해결하여 얼마나 디지털 신호를 왜곡 없이 사용자에게 전송할 수 있느냐\ulcorner 이다. 그러나 설계상의 문제, 환경변화, 부품의 열화등의 원인에 의해 발생될 수 있는 위상오차는 VSB 방식의 변조기에서의 I, Q 데이터에 왜곡을 일으키게 하거나, 1KW 이상의 송신을 하는 방송 장비에 유지되어 타 인접 채널에 심각한 영향을 일으키기도 한다. 이와 관련하여 본 논문에서는 위상오차 원인 중의 하나인 8레벨의 디지털 신호에서 IF(Intermediate Frequency) 주파수대로 변환될 때에 발생되는 위상오차를 분석하였고, 이에 대한 보상 알고리듬을 제안하였고, 이를 적용한 결과를 논하였다. In this paper, we have studied the 8 YSB (8 Vestigial Side Band) method which is decided as the standard of modulators for next generation digital TV System. In developing digital TV System, one of the difficult problems is how digital signal can be transmitted to the receiver without any phase distortion. But, phase error is liable to occur by imperfect design, circumstance variation and device degradation. These characteristics result in distortion of 1,0 signal of modulator and interference in adjacent channels. In particular, the interference in modulator of a high power amplifier result in serious problems in adjacent channels. Here we analyzed problems of phase error which are occurred when 8 levels digital signals are modulated to If signal. And we suggested phase error compensation algorithm and discussed the results for adaptation of the algorithm

고기동 무인항공기용 터보제트엔진의 비선형 제어

한동주(Dong-Ju Han),오성환(Seong-Hwan Oh) 한국항공우주학회 2012 韓國航空宇宙學會誌 Vol.40 No.5

고기동 무인항공기용 터보제트엔진의 고성능 운용을 위한 비선형 제어기를 설계하였다. 제트엔진의 비선형특성을 제어기 설계에 반영하기 위해 당해엔진의 동적해석코드를 개발하였고 이를 이용한 선형모델로부터 선형해석의 한계성을 검증함으로써 비선형 제어기 설계의 당위성을 보였다. PI형 퍼지제어기를 일반 미분제어기와 결합하여 효율적인 퍼지 제어기를 설계하였으며, 일반 PID제어기와 비교하여 압축기서지 및 연소정지영역, 터빈온도의 제한 등 안전운전 범위 내 운전을 보장하면서도 월등한 제어성능을 보임으로써 설계된 퍼지제어기의 유용성을 입증하였다. Non-linear turbojet engine controller with high operational performance has been designed for the high maneuverability UAV. The turbojet engine dynamic performance code has been developed to reflect the non-linear characteristics on controller design, by which the necessity of non-linear controller design was justified by investigating the limitation of linear model derived from the dynamic performance. The PI-like fuzzy controller was designed and enhanced by combining with conventional derivative control. This designed fuzzy controller proves its effectiveness by showing superior control performances over the conventional PID controller along with guaranteeing the safe operation within compressor surge, flame out and turbine temperature limits etc.

경무인항공기 엔진조사 및 선정연구

양계병(Gyaebyung Yang),오성환(Seong Hwan Oh) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.5

무인기에서 엔진은 항공기 비행에 필요한 추진력을 발생하고, 계통에 동력을 제공하는 역할을 한다. 다양한 영역의 무인기개발과 함께 여러 종류의 추진기관이 요구되고 있고, 각각의 추진기관별로 저비용, 고효율 및 추력대 중량비 감소 등의 기술혁신이 지속적으로 추진되고 있다. 본 논문에서는 약 1500 kg 급의 경무인기에 대한 왕복엔진 조사 및 선정에 대해 기술하고자 한다. 우선 왕복엔진 선정업무는 총중량 1,500 kg 급 무인기별로 적용된 엔진을 조사하고, 기술발전 추세, 엔진별 특징 및 주요 기술 변수를 정리하였다. 엔진 선정업무는 경무인기에 필요한 엔진의 주요 요구조건을 정리하고 무인기 운용에 필요한 각종 선정변수를 정의하였다. 선정된 변수를 기준으로 경무인기에 적합한 대상 후보엔진을 분류하였다. 이와 더불어 경무인기급 왕복엔진에 대한 국내 발전방향을 제시하였다. The engine for UAV provides a thrust for flight, and provides shaft power to subsystem. the different type of UAV requires a variety of propulsion system. Each propulsion system has been promoting a low cost, high efficiency and low specific weight per weight since development. A study of survey and selection of light UAV engine are described in this paper. First, the survey of both roughly 1500kg UAV and a engine is carried. Second, technical trends, parameters and characteristics of each engine are investigated. The major requirements of an engine for selection are defined. Finally, several candidate engines for light UAV are selected. There are recommendations for the in-country development of reciprocating engine for light UAV.

Diethylstilbestrol과 관련이 없는 자궁경부 투명세포암

나수미 ( Su Mi Na ),오성환 ( Seong Hwan Oh ),김흥곤 ( Heung Gon Kim ),문형배 ( Hyung Bae Moon ) 대한산부인과학회 2007 Obstetrics & Gynecology Science Vol.50 No.3

Clear cell carcinoma of the uterine cervix is rare type of the uterine cervical adenocarcinoma. Although uterine cervical adenocarcinomas presently represent 20% to 30% of cervical cancers in the industrialized countries, the clear cell carcinoma of uterine cervix is very rare malignancy that accounts for 4% to 9% of the adenocarcinoma of uterine cervix. This malignancy occurs in two distinct age groups; those younger than 24 years and those older than 45 years. In younger patients, most of these malignancies are mainly related to prenatal diethylstilbestrol (DES) exposure, but older patients are unrelated to in utero DES-exposure. We experienced a case of clear cell carcinoma of the uterine cervix of 34 years old housewife who was not related to prenatal DES-exposure. We presented a case with a brief review of related literatures.

남부지역의 논 토양에 적합한 콩 품종의 선발

오서영(Seo Young Oh),오성환(Seong Hwan Oh),최지수(Jisu Choi),김태희(TaeHee Kim),서종호(Jong Ho Seo) 한국원예학회 2022 한국원예학회 학술발표요지 Vol.2022 No.11