http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 이호준 (검색결과 2,006 건)
- 무료
- 기관 내 무료
- 유료
-
-
-
다차원 패턴기술을 이용한 광대역 마이크로스트립 안테나 설계
이호준,박규호 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.1
This paper demonstrates the detailed study of a microstrip Yagi-Uda antenna with and without PBG structure at wireless LAN(5725∼5825 MHz) frequency band. The impedance bandwidth of the antenna with the PBG holes is greater than (about 30 MHz) that of its counter part without PBG holes. The measured gains of the antenna at the frequency band are 7 dB and 6 dB respectively for antenna with and without PBG. The improvement of gain of about 1 dB is likely due to the suppression of surface wave.
-
-
이호준,이재영,김종규 한국마이크로전자및패키징학회 2004 마이크로전자 및 패키징학회지 Vol.11 No.1
In this paper, the wideband microstrip patch antennas for the Personal communications Service (PCS : 1750∼1870 MHz) and International Mobile Telecommunications-2000 (IMT-2000 : 1920∼2170 MHz) dual band are studied. Experimental and simulation results on the dual band antenna are presented. Simulation results are in good agreement with measurements. The experimental and simulation results confirm the wideband characteristics of the antenna. The studied antenna satisfied the wideband characteristics that are required characteristics for above 420 MHz impedance bandwidth for the PCS and IMT-2000 dual band antenna. In this paper, through the designing of a dual band antenna, we have presented the availability for PCS & IMT-2000 base station antenna. An impedance bandwidth of 33% (VSWR<1.5, 650 GHz) and a maximum gain of 7dB can be achieved. The radiation pattern is stable across the passband.
-
-
대상회 피질, 편도체, 해마체, 도피질의 T2 이완시간: 1.5테슬러와 3.0테슬러 자기공명영상장치의 비교
이호준,김응엽 대한자기공명의과학회 2011 Investigative Magnetic Resonance Imaging Vol.15 No.1
Purpose : To compare T2 relaxation times (T2) in the cingulate cortex, amygdaloid body, hippocampal body, and insular cortex between 1.5T and 3.0T MR imagers. Materials and Methods : Twelve healthy volunteers underwent FLAIR and CPMG imaging perpendicular to the hippocampal body at both 3.0T and 1.5T. T2 was measured in the cingulate cortex, amygdaloid body, hippocampal body, and insular cortex. The T2 relaxation time ratios of the cingulate cortex, insular cortex, and amygdaloid body to the hippocampal body were compared between 1.5T and 3.0T. Results : The mean T2 of the cingulate cortex, amygdaloid body, hippocampal body, and insular cortex at 1.5T were 109.5±3.1, 117.0±7.1, 114.7±2.4, and 111.3±2.4, respectively; 99.7±3.8, 100.7±4.3, 97.9±3.4, and 96.2±2.0, respectively, at 3.0T. Percentage changes of T2 in the cingulate cortex, insular cortex,amygdaloid body, and hippocampal body at 3.0T with respect to those at 1.5T were -8.9%, -13.5%,-14.6%, and -13.5%, respectively. The mean T2 ratios of the cingulate gyrus, insular cortex, and amygdaloid body to the hippocampal body at 1.5T and 3.0T were 0.96 and 1.02 (p=0.003); 1.02 and 1.03(p>0.05); 0.97 and 0.98 (p>0.05), respectively. Conclusion : T2 decrease in the cingulate cortex was less than the amygdaloid body, insular cortex, and hippocampal body at 3.0T. The mean T2 ratio of the cingulate gyrus to the hippocampal body was significantly different between 1.5T and 3.0T. 목적 : 1.5T와 3.0T MRI에서 대상회 피질, 편도체, 해마체, 도피질의 T2 이완시간 (T2)을 비교하고자 하였다. 대상 및 방법 : 건강한 12명의 자원자를 대상으로 1.5T와 3.0T에서 해마에 대해 수직으로FLAIR와 CPMG 펄스열 영상을 같은 조건으로 획득하였다. 대상회 피질, 편도체, 해마체, 도피질에서 T2를 측정하였고, 해마와 나머지 부위의 T2 비를 1.5T와 3.0T 사이에서 비교하였다. 결과 : 1.5T에서 측정한 평균 T2는 대상회 피질, 편도체, 해마체, 도피질에서 각각 109.5±3.1, 117.0±7.1, 114.7±2.4, 111.3±2.4, 3.0T에서 측정한 값은 각각 99.7±3.8,100.7±4.3, 97.9±3, 4, 96.2±2.0 이었다. 1.5T와 3.0T 사이의 T2 변화 백분율은 각각-8.9%, -13.5%, -14.6%, -13.5% 이었다. 1.5T와 3.0T 사이에서 해마체에 대한 대상회 피질, 편도체, 도피질의 T2 비는 각각 0.96 과 1.02 (p=0.003), 1.02 과 1.03 (p > 0.05),0.97 과 0.98 (p > 0.05)이었다. 결론 : 3.0T에서 대상회 피질의 T2 감소는 편도체, 도피질, 해마체와 비교해서 상대적으로 적었고, 대상회 피질과 해마체의 T2 이완시간비는 1.5T와 3.0T에서 의미 있는 차이를 보였다.
-
-
한국 남성 불임환자에서 Y 염색체상의 AZF Gene에 대한 분석 및 DAZ Gene의 발현 양상
이호준,이형송,송견지,변혜경,서주태,김종현,이유식,Lee, Ho-Joon,Lee, Hyoung-Song,Song, Gyun-Jee,Byun, Hye-Kyung,Seo, Ju-Tae,Kim, Jong-Hyun,Lee, You-Sik 대한생식의학회 1997 Clinical and Experimental Reproductive Medicine Vol.24 No.1
Cytogenetic observations of loss of the distal portion of the Y chromosome long arm were found to be associated with disrupted spermatogenesis. The existence of a gene involved in the regulation of spermatogenesis, the azoospermia factor (AZF), was postulated. In this study, we screened the AZF region including DAZ and DAZH genes and observed the expression pattern of DAZ and DAZH transcript in infertile men with azoospermia and oligospermia by using a sequence-tagged site (STS)-based PCR method. PCR primers were synthesized for 11 STSs that span Yq interval 6, SRY, DAZ, and DAZH, functional DAZ homologue on chromosome 3. Microdeletions were detected in 4/32 (12.5%) azoospermic men and 1/11 (9%) severe oligospermic men. Only 2 of 5 patients had microdeletions of Yq that contained the DAZ gene, whereas the other 3 patients had deletions extending from intervals 5L-6F proximal to the DAZ gene on Yq. Testis biopsies of the azoospermic patients revealed a variety from Sertoli cell-only syndrome to testicular maturation arrest. Of 4 men with clinical data available, average testis size was R: 13.8 cc, L: 13.8 cc, serum T was $4.0{\pm}1.25$ ng/ml, LH was $3.63{\pm}1.90$ mIU/ml, and FSH was $8.85{\pm}5.13$ mIU/ml. These values did not differ significantly from the remainder of the patients tested. We could not observed the DAZ transcript in 2 patients, who have no mature spermatozoa. In 11.6% of patients microdeletions of the AZF could be detected. These deletions in the AZF region seem to be involved causing spermatogenic failure. But the frequency of microdeletions proximal to DAZ suggests that DAZ is not the only gene associated with spermatogenic failure.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
