MIMO 시스템에서 송수신 결합 최적화에 관한 연구

유미연,이원문,홍인기 경희-다반 ASIC 설계교육센터 2002 경희-다반 ASIC센터 논문집 Vol.3 No.-

본 논문에서는 4G 이동통신 시스템 기반 기술인 MIMO (Multi-Input Multi-Output) 시스템에서, 채널 정보를 이용할 때, 결합 송수신 최적화 형태를 유도 하였다. Lagrange Multiplier Method를 이용하여 일반적인 SINR(Signal to interference and noise ratio)의 극대값을 유도하는 과정에서, 결합 송수신 형태를 수식적으로 유도하였고, 이를 ITU-R M.1225 채널 모델에 적용하여 시뮬레이션 하였다 또한 채널에 대한 정보가 없을때, 시공간 다이버시티를 얻을 수 있는 STBC(Space time Block Coding)의 MIMO 시스템과 비교하였다.

락킹 기법을 이용한 다중 사용자 레이져 마킹 시스템의 설계 및 구현

홍성수,서유미 호서대학교반도체제조장비국산화 연구센터 2000 반도체 장비기술 논문집 Vol.2000 No.-

분산 시스템 상에서 다수의 사용자는 하나의 공통된 가상공간을 가지고 있다. 이러한 가상 공간상에서 다수의 불특정한 사용자들은 상호작용을 자유롭게 실실간으로 처리해야 될뿐만 아니라 객체들은 공유공간 내에서 결합시키거나 추가, 삭제 등을 충돌없이 수행되어야 한다. 반도체 레이져 마킹이란 반도체 제조 과정중 마지막 단계에서 반드시 필요로 하는 기술로 반도체 표면에 레이져빔을 이용해서 해당 문자열과 이미지를 고속으로 출력시키는 것이다. 본 논문은 반도체 레이져 마킹시스템에서 다중 사용자가 공통된 객체를 공유할때 발생되는 병행성 문제를 AVL트리와 락킹(Locking)기법을 이용해 설계하고구현하였다.

경막 내 colistimethate 투여로 치료한 다제 내성 cinetobacter baumannii 뇌실염

홍유아,유진홍,김진진,모은영,안건희,정희경,김진석,이현정,정미향,윤승배 대한감염학회 2009 감염과 화학요법 Vol.41 No.4

Acinetobacter species is a non-fermentative aerobic gram-negative coccobacillus that is an important pathogen found in nosocomial infections. Recently, multi-drug resistant Acinetobacter baumannii (MDR-AB) infections have been increasing and pose a serious problem. Most such infections present as bacteremia, pneumonia, or a wound infection; however, CNS infections are very rare. We herein present a case of ventriculitis caused by MDR-AB in a 37-year old man after a neurosurgical intervention. The patient was successfully treated with intrathecal colistimethate.

Cisplatin 병용화학요법시 발생한 오심, 구토에 대한 Ondansetron과 Metoclopramide의 효과에 대한 비교

김미자,국기용,김태원,박유환,김완중,허경,정춘해,홍순표 朝鮮大學校 附設 醫學硏究所 1993 The Medical Journal of Chosun University Vol.18 No.1

Inspite of possible effects for emesis following chemotherapy including cisplatin, nausea and vomiting are the most unpleasant side effects of cancer chemotherapy. None of the currently available antiemetic agents is entirely effective preventing emesis. Ondansetron, a 5-HT(5-hydroxytryptamine)_(3) receptor antagonist, has been shown to be effective antiemetic agent in the control of cisplatin induced emesis. Twenty solid tumor patients who are scheduled to receive cisplatin containing combination chemotherapy participated in a prospectively randomized study to compare the antiemetic efficacy and safety of ondansetron and metoclopramide. Ondansetron was given in dose of 8mg intravenous 30min before cisplatin and then 4hours and 8hours after cisplatin on day 1, and Ⅰ.Ⅴ. every 8hours from day 2 to 5. In the metoclopramide group, metoclopramide was given in dose of 2 ㎎/㎏ intravenous every 8hours from day 1 to 5. The control of emesis was graded in the following way : complete response, no vomiting : major response, 1-2 emetic episodes : minor response, 3-5 emetic episodes : failure, above 5 emetic episodes. Complete or major response of emesis was achieved 10 of 12(83.2%) patients receiving ondansetron and in 5 of 8(62.5%) patients receiving metoclopramide, but effectiveness was not significantly different. Ondansetron was at least as effective as metoclopramide therapy in controlling cisplatin induced emesis. Side effects in ondansetron was less than in Metoclopramide.

부산 일부 대학교 학생들의 니코틴 의존도와 구취의 연관성

김유린(외 5명) 신라대학교 자연과학연구소 2012 自然科學論文集 Vol.22 No.-

The purpose of this study is to examine the association of bad breath and nicotine dependency. By use of the findings from this study, This study conducted the survey of 53 smoker who visited dental hygiene lab for delivery from October to November 2012 with structured questionnaires(Fagerstrom Tolerance Questionnaire FTQ) and equipment(CO measuring instrument, Oral Chroma etc). The data were analyzed by using SPSS 20.0 program for χ2-test, ANOVA. Smokers' average age was 23 years old. The more higher nicotine dependence the more the average age was higher. The more higher nicotine dependence the less to nque brushing. No association of nicotine dependence and self-bad breath level. CO State was Significant differences(ND1(M=2.58), ND2(M=3.98), ND3(M=7.41), ND4(M=4.19), ND5(M=13.14))(F=2.616, p=.047). Dimethyl Sulfide was Significant differences(F=3.026, p=.026).

일부 고지혈증 폐경 여성의 Isoflavone 공급에 따른 혈중지질 변화에 관한 연구

이다홍,승정자,이행신,김미현,서유리 대한지역사회영양학회 2001 대한지역사회영양학회지 Vol.6 No.1

Intake of soy protein may decrease the risk factors associated with cardiovascular disease in postmenopausal women. This study was designed to investigate the effects of isoflavone supplementation on serum lipids in 16 hyperlipidemic postmenopausal women. For this purpose, an intervention study was conducted for 12 weeks. Subjects were healthy, free-living women consuming habitual diets with 0.3 g/d of isoflavone. Food and nutrient intake was obtained by 24-hr recall method and anthropometric measurements were made. Systolic and diastolic blood pressure, total serum cholesterol, HDL-cholesterol and LDL-cholesterol were determined before and after the isoflavone supplementation. The results were summarized as follows. The average age, height, weight and BMI of the subjects were 65.3 years, 151.4 cm, 62.2 kg and 27.1, respectively. The systolic blood pressure and diastolic blood pressure were not reduced significantly with isoflavone supplementation. Total cholesterol (p < 0.001), HDL-C (p < 0.05), and LDL-C (p < 0.01) were significantly increased after isoflavone concentration. In conclusion, isoflavone supplementation was not effective to modify risk factors for cardiovascular disease.

소목(Caesalpinia sappan) 추출물의 Streptococcus mutans에 대한 성장, 산생성, 부착 및 비수용성 글루칸 합성 억제에 미치는 영향

유용욱,유현희,김윤정,유미선,서세정,이황,이흥수 대한구강보건학회 2003 大韓口腔保健學會誌 Vol.27 No.2

Streptococcus mutans is known as the causative bacterial playing the most important role in forming plaque and it is being noticed as major causative bacteria of dental caries. Therefore, development of more effective, substantial and safe preventive agent against dental caries and periodontal disease is honestly required. The present study was designed to investigate the effect of chloroform extract(CE), n-butanol extract(BE),methanol extract(ME) and water extract(WE) of Caesalpinia on the growth, acid production, adhesion, and insoluble glucan synthesis of Streptococcus mutans. The CE, BE, ME and WE decreased the growth and acid production of S.mutans than that of control, especially, the ME was more effective than other extracts. The effect of CE, BE, ME and WE on the adherences to saliva-coated hydroxyapatite bead(S-HA) were evaluated. At the concentration of 2,000 ㎍/㎖, the CE showed 32% rate of bacterial adherence to S-HA, whereas, other extracts of the same concentration producedgreater than 50% rate. The CE and BE were significantly decreased the reduction rates of water insoluble glucan formation from sucrose by crude glucosyltransferase of S.mutans. Thus, the application of C. sappan can be considered a useful and a practical method for the prevention of dental caries.

좌측흉수로 발현된 Boerhaave 증후군 1예

이준,변유미,조민근,조주연,원경준,김영대,박찬국,김만우,유재근,서홍주,이석기 朝鮮大學校 附設 醫學硏究所 2008 The Medical Journal of Chosun University Vol.33 No.2

구토 후 발생한 토혈을 주소로 내원한 환자에서 좌측 늑막 삼출 동반 시 식도 파열의 가능성을 고려하여 흉수 천자 및 지속적인 흉부 단순 촬영의 추적관찰이 필요하며 식도 파열이 배제된 후 환자의 생체 징후 및 토혈 양을 파악하여 내시경 검사 시기를 신중히 결정하는 것이 좋을 것으로 생각된다. 본 증례는 토혈을 주소로 내원하여 Mallory-Weiss 증후군 의심 하에 내시경을 통한 치료 시행 후 추적 관찰에 의해 진단된 Boerhaave 증후군을 경험하였기에 보고하는 바이다. Boerhaave's syndrome is a spontaneous perforation of the esophagus most commonly resulting from a sudden increase in intraesophageal pressure combined with negative intrathoracic pressure caused by straining or vomiting. Surgery should generally be performed within 24 hours because mortality approached 30 to 50 percent in which surgery was delayed. Therefore, early diagnosis and prompt surgical repair are critical for survival. We have experienced a case of Boerhaave's syndrome in a patient presenting with hematemesis with left pleural effusion without any signs or symptoms of pneumomediastinum or pneumothorax.

항결핵 치료과정에서 호전되었다가 악화된 뇌 결핵종 1예 보고

이대훈,유진홍,강미자,김홍기,김선화,고동훈,천지성,유원종 대한화학요법학회 1997 대한화학요법학회지 Vol.15 No.3

In spite of nationmide tuberculosis control program, tuberculosis is still prevalent in Korea. Accordingly, tuberculous meningitis also poses one of the main trouble some problems. Recently, We experienced a perplexing case of tuberculous menin-gitis and tubercdoma in a 24-year old female patient. She was admitted to our hospital owing to meningeal irritation sign, aphasia, VI nerve palsy, and ,fever. CSF analysis showed a finding consistent with that of presumptive tuberculous meningitis.. Initial MRI of the brain revealed a large mass(tuhercu1oma) on left parieto-temporal area. Antitubeculous regimen(1soniazid (INH), rifampin(RMP), ethambutol(EMB), pyrazinamide(PZA)} of meningeal dose was given immediately, and her symptoms and signs were dramatically disappeared with a few days after treatment. She was discharged with improved condition and under maintenance treatment of tuberculosis. Follow-up one year after treatment. revealed that the previous lesion was nearly diminished. She showed no symptom at all until she recognized a total blindness of sudden onset on her left eye a t the 18th month of treatment. Brain MRI checked at that time showed multiple masses of tuberculoma scattered over the brain base and one of them invaded left optic nerve. In our opinion, the cause of relapse in this patient might he explained by the selection and ultimate replication of a minor population of resistant strain. Although such relapse is an extremely rare event, we think that we should always pay attention to this possible resistance problem every time we meet patients with tuberculous meningitis.

대량의 각혈로 사망한 장티푸스 1예

한상우,유진홍,권순석,김성훈,박지찬,홍은정,최경성,박용완,장준희,안지원,박유경,강지영,박상미,신완식 대한감염학회 2004 감염과 화학요법 Vol.36 No.5

We experienced a 25 year-old male patient with typhoid fever complicated with massive hemoptysis. Pulmonary complication in typhoid fever is very rare and to our knowledge, there has been no report of hemoptysis as a main cause of death with this disease. We herein report a rare case of typhoid fever.