고속 채널환경에 강건한 OFDM 시스템을 위한 채널추정기법

강연석,황태욱,최준철,김영수 경희-다반 ASIC 설계교육센터 2004 경희-다반 ASIC센터 논문집 Vol.5 No.-

본 논문에서는 Orhogonal Frequency Division Multiplexting(OFMB) 시스템의 성능 향상을 위해 파일럿 심볼을 이용한 향상된 채널추정 알고리즘을 제안한다 기존의 LMMSE 알고리즘을 이용한 채널 추정 방법은 파일럿 심볼만을 채널 추정에 이용함으로써 파일럿 간격이 멀어짐에 따라 성능이 현저하게 떨어지는 단점이 있다. 이런 문제를 해결하기 위해 파일럿 사이의 채널을 선 추정하고 이 추정된 값을 다시 파일럿과 함께 이용하여 채널을 추정하는 채널추정기법을 제안하였다. 제안된 추정기법은 도플러 주파수를 36Hz애서 185Hz인 페이딩 채널환경에 적용했다. 기존의 LMMSE 추정기법과 비교했을 때 특히 큰 도플러 주파수애 대해 강건한 특성을 보였다.

梅泉의 交遊를 통한 意識世界 硏究

柳年錫,黃秀貞 順天大學校 師範大學 附屬 科學敎育硏究所 2002 科學과 敎育 Vol.10 No.-

This study covers the life of "Maecheon Hwang―hyeon", who was one of the last scholars in the Chosum Dynasty, along with his social intercourse. ChapterⅡ summarizes the findings in related to his social intercourse. His social intercourse are divided into two categories in terms of area ; Local area (his home town) and Central area (capital of that time). In kwnagyang he kept company with local scholars, who helped him to consolidate his own unique poetic styles and literary world. ChapterⅢ he kept close relationship with those days' respectable scholars. Through the friendly and beneficial company, he not only got rich in social experiences, but also, he could open the new horizon, through which he became well―known with widely ranged view points of the society. In conclusion, Maecheon, one of the greatest writers, accomplished literary mastery that absorbed the pains of folks those days, along with contribution to upgrading confucian literature.

임상검체에서 Polymerase chain reaction(PCR)을 이용한 결핵균 신속 검촐에 대한 연구

김영권 ; 황석연 김천대학교 2000 김천대학교 논문집 Vol.21 No.-

This study has been carried out to investigate the sensitivity of polymerase chain reaction (PCR) method over conventional acid-fast bacilli (AFB) staining and culture methods for the detection of Mycobacterium tuberculosis from trace body fluid specimens. Total 65 cases were employed for the AFB staining, culture and PCR test. PCR positive reaction was shown in 12.1% of the specimens having negative reaction to AFB staining and 3.7% of the specimens repre-senting negative reaction in culture. From these results, we have known that PCR was a best method than AFB staining and culture in sensitivity and specificity to M tuberculosis detection.

농어촌 지역의 한방의료 이용 실태에 관한 조사 : 전남 신안군 장산면을 중심으로

宋峰根,黃忠演,文錫哉 圓光大學校 韓醫學硏究所 1992 원광한의학 Vol.2 No.1

The prevalence of disease is affected by cultural factors. Changing cultural and social pattern may modify patterns of disease. Today majority of labor force in rural community is elderly population with a concomitant increase in woman. We investigated prevalence of problems in rural population utilizing oriental medical clinic in Changsan-myon, Shinan-gun, Chunnam. The majority of patients in this area were female and in the 40 to 60s. Muscoskeletal problems had the highest incidence. Low back pain was leading complaints in the muscoskeletal problems and knee pain was the most common complaints in the digestive problems, headache in the neurologic problems. cough in the respiratory problems, hypertension in the circulatory problems, ear problems in the sense organ problems, pruritys in the dermatologic problems, leukorrhea and postmenopausal syndrome in the gynecologic problems, and dysuria and enuresis in the urinary problems. These results suggest that oriental medical physicians have attention to health care and management of the expanding population of elderly and female patients with high incidence of muscoskeietal problems in the rural community.

서고에서 분리한 곰팡이의 생리적 특성에 관한 연구

김영권 ; 황석연 김천대학교 2002 김천대학교 논문집 Vol.23 No.-

Habitative microorganism were isolated from the floated air and surface of record materials of library with ancient archives.

겨우살이 lectin의 간기능 영향

장철수 ; 황석연 김천대학교 2004 김천대학교 논문집 Vol.25 No.-

In the present study, the author investigated change of liver funtion in Viscum album lectin The lectin was purified by 0.15 M NaCl extraction, amnonium sulfate precipitation, sepharose 4B affinity chromatography and gel filtration using sephadex G-150 with plant material from Viscum album collected in Mt. Duk Yui. After 72 h of CCI, injection (in olive oil, 1:1, 2 mg/kg) there was a sig nificant increase in serum AST and ALT levels relative to the control group. However, treatment of either Viscum album extracts and purified lectin offered no protection against CC1,-induced hepatotoxicity. Histological observation basically supported the result obtained from serum enzyme assay. The livers of rats challenged with CCl. produced a marked increased cytoplasmic vacuoles and inflammatory cellsin num-ber, while the number of necrotic cells and swollen hepatocytes did not change significnatly. Rats administered olive oil alone did not alter the normal hepatic architecture. Histological observation of liver section in rat treated 72 h with either Viscum album extract and purified lectin CCl-induced liver damage showed number of cytoplasmic vaculoe and necrotic cell. The number of inflammatory cell increased markedly. The normal hepatic architectural pattern was lost in Hematoxylin-eosin stain. This results suggest to the conclusion that Viscum album lectin has a physiological effect of hepatotoxicity activator.

변잠혈 검사에서 Guaiac법과 Latex법의 비교

장철수 ; 황석연 김천대학교 2010 김천대학교 논문집 Vol.21 No.-

There was concern about the false positivity of the popular guaiac-based test in fecal occult blood screening for the early detection of colorectal carcinoma. Recently the new immunological fecal occult blood test which was specific for humal hemoglobin was introduced. We evaluated guaiac, latex agglutination, and latex agglutination inhibition method. In senstivity study, guaiac and latex agglutination inhibition methods were positive above 1 mg/dl, latex agglutination method was positive above 0.1 w/dl. In specificity study, guaiac method was pos-itive to all seven animal hemoglobin, but two immunologic methods were opposit results. In the effect for temperature in stool collec-tion, converted to negative at 3-days in guaiac method, at 7-days in latex agglutination method, and at 14-days in latex agglutination inhibition method. In comparision study, the guaiac and immunolog ic positive rates were 35.0% and 9.0%. Most guaiac positive results were observed in unrelated gastrointestinal disorders. Guaiac method had been often false positive results, but immuno-logic fecal occult blood tests were excellent specific method for human hemoglobin methods showed similar positive rates.

Inoue Balloon을 이용한 PMV의 장·단기 결과 분석

진은선,이연아,전숙,김현숙,정승묵,박상선,최락경,임달수,홍석근,황흥곤 대한순환기학회 2003 Korean Circulation Journal Vol.33 No.11

Longitudinal Thermal Movement of Polymer Concrete Irrigation Aqueducts

Yeon, Kyu Seok,Hwang, Jin Yong,Kim, Chul Young,Yeon, Jung Heum Trans Tech Publications, Ltd. 2015 Advanced materials research Vol.1129 No.-

<P>This study evaluates the longitudinal thermal movements of precast polymer concrete aqueducts made with MMA modified UP polymer concrete. The aqueduct investigated in this study had a total span length of 30 m, which is composed of three 10 m span flumes with an inner cross-section of 700 x 600 mm. To accomplish this objective, temperature and corresponding longitudinal movements of transverse expansion joints were continuously monitored in the field for 23 months. The maximum seasonal variation of joint displacement was found to be approximately 13 to 14 mm, which is relatively high. Also, the field measurements were compared with theoretical calculations to validate the experimental data, and the results showed a good agreement with each other. Finally, in this study, an adjustable expansion joint system for aqueducts was devised in order to prevent water leakage and joint deterioration resulting from successive thermal movements of joints.</P>

Development of Irrigation System for Roller-Type Onion Pot-Seeding Machine

( Seok-joon Hwang ),( Ju-yeon Lee ),( Ju-seok Nam ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

In this study, a modular type irrigation system applicable to the existing roller-type onion pot-seeding machine was developed, and optimal operating conditions were derived. The irrigation type of the developed irrigation system is drip-type and it can support irrigation by each pot tray cell. The irrigation system consists of water tank, water pump, irrigation pipe, irrigation height regulator, hand valve, etc. Each component was selected considering durability and economical efficiency. Factorial experiment was performed by setting the hole diameter of the irrigation pipe and the hand valve open/close as a experimental factors. In the experiment, the optimal result was obtained in the condition of 1.0 mm of the hole diameter and closed hand valve. It is possible to reduce labor and do initial irrigation by applying the developed irrigation system to the existing roller-type onion pot-seeding machine. Furthermore, the productivity and efficiency of onion cultivation can be increased.