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HAPS와 NGSO 시스템의 Feeder Link상의 간섭분석
문승영,김봉석,강영흥 군산대학교 정보통신기술연구소 2000 情報通信技術硏究論文集 Vol.4 No.-
In this paper, interference effects between NGSO and HAPS in the feeder link have been simulated and analyzed by means of calculating excess time percent and duration below the C/I protection ratio. As the results, in the case of HAPS interference into NGSO, it can be obtained that the lowest C/I values are 20.42dB in 50Km and 12.73dB in 20Km of HAPS altitudes, respectively. And in the case of NGSO interference into HAPS, it can be obtained that the lowest C/I values are 13.94dB and 10.42dB respectively. HAPS system has more interference reception from other systems or effects more interference into other systems as its altitude is lower. Also, the lowest C/I values are appealed at difference time with its altitude.
HAPS와 NGSO 시스템간의 Feeder Link상의 간섭분석
강영흥,문승영 한국항행학회 2000 韓國航行學會論文誌 Vol.4 No.2
본 논문은 HAPS와 이동위성 시스템과의 간섭영향 분석으로서, HAPS 고도가 20km와 50km일 때의 C/I 값을 구해 간섭 보호비를 초과하는 시간을 및 초과지속시간에 대한 평가를 행하였다. 그 결과 HAPS가 Iridium 시스템에 미치는 간섭의 경우 최저 C/I 값은 HAPS 고도가 50km일 때 20.42㏈. 20km일 때는 12.73㏈로 낮아지고, 이와 반대인 Iridium 시스템이 HAPS에 미치는 간섭의 경우도 각각 13.94㏈에서 10.42㏈로 낮아짐을 알 수 있었다. HAPS 고도에 따른 간섭영향을 보면, 고도가 낮아질수록 강한 간섭을 주거나 받게 되며, C/I 최저 값 또한 HAPS 고도에 따라 다른 시점에서 나타난다. In this paper, interference effects between NGSO and HAPS in the feeder link have been simulated and analyzed by means of calculating excess time percent and duration below the C/I protection ratio. As the results, in the case of HAPS interference into NGSO. it can be obtained that the lowest C/I values are 20.42㏈ in 50km and 12.73㏈ in 20km of HAPS altitudes, respectively. And in the case of NGSO interference into HAPS, it can be obtained that the lowest C/I values are 13.94㏈and 10.42㏈ respectively. HAPS system has more interference reception from other systems or effects more interference into other systems as its altitude is lower. Also, the lowest C/I values are appeared at difference time with its altitude.
홍기환,김창현,문승영,김범규,이상헌,임현실,최승철 대한이비인후과학회 2002 대한이비인후과학회지 두경부외과학 Vol.45 No.3
Background and Objectives:For surgery of chronicaly inflamed submandibular gland, most head and neck surgeons carry alternative to the standard transcervical approach has been reported. To evaluate a postoperative morbidity in the intraoral approach for excision of submandibular gland. Subjects and Methods:A total of 62 surgery cases for chronic submandibu-lar sialoadenitis with or without stone, including those resulting from benign tumor of submandibular gland, were carried out via intraoral approach during a 3-year period. Results:Most patients (85.5%) had sialoadenitis with or without stone. Early of tongue movement in 67.7% and 2 cases of postoperative bleeding and 1 case of absces formation. The tongue paresis resolved spontaneously in all patients in a mean period of 3-4 weks, whereas late complications developed in 3 cases of re-sidual salivary gland and abnormal sense of mouth floor and one case of gustatory sweating syndrome. No residual inflam-ation in Whartons duct was noted. Neurological complications of hypoglossal and marginal mandibular nerves were not observed at all. Conclusion:nerve or to the hypoglossal nerve, and no residual Whartons duct inflammation. The disadvantage is a more difficult dissection to transcervical approach before proper expert due to narow surgical field, especialy in the severe adhesion of salivary gland to surounding tissue. However, with experience, the intraoral dissection of submandibular gland should be easier. (Korean J Otolaryngol 2002;45:268-72)
오재광,양승덕,문승영,신시옥 대한이비인후과학회 2009 대한이비인후과학회지 두경부외과학 Vol.52 No.11
Cholesterol granuloma is a histological term used for the description of a tissue response to a foreign body such as cholesterol crystals. The pathogenesis of cholesterol granuloma is controversial. But three factors are thought to have an important role in its development: obstruction of ventilation, impaired drainage, and hemorrhage. It may arise from any portion of the pneumatized temporal bone. But huge cholesterol granuloma with intracranial and extradural extension has been rarely reported. Recently, we experienced a case of huge cholesterol granuloma with intracranial and extradural extension. The patient has never experienced chronic otitis media before. The cholesterol granuloma was successfully removed by transmastoid approach. So we report this case along with a literature review.
이명을 동반한 외경동맥영역에 자연발생한 동정맥누공의 경피적 혈관색전술을 이용한 치험 1예
이상헌,윤용주,문승영,최승철 대한이비인후과학회 2002 대한이비인후과학회지 두경부외과학 Vol.45 No.4
Arteriovenous fistulas of head and neck, especially the external carotid artery are uncommon lesions usually of traumatic origin. They also may be spontaneous, inflammatory, or congenital origin. They maybe accompanied by symptoms and signs such as pulsatile tinnitus, pulsatile mass, palpable thrill, and machine like bruit. Recently, we experienced a case of spontaneous arteriovenous fistula of external carotid artery, treated by coil embolization. The patient noticed pulsatile tinnitus in the left posterior auricular area and left upper neck area. She had no history of head trauma. External carotid angiogram showed fistula between the branches of the external carotid artery (occipital artery, middle meningeal artery, posterior auricular artery) and the internal jugular vein. The fistulas were successfully controlled by coil embolization. (Korean J Otolaryngol 2002; 45:404-7)
이명희,이승노,문승영,임상호,조영주,홍기환,Lee, Myeong-Hee,Lee, Seung-Rho,Moon, Seung-Young,Lim, Sang-Ho,Cho, Young-Joo,Hong, Ki-Hwan 대한후두음성언어의학회 2008 대한후두음성언어의학회지 Vol.19 No.2
Background and Objectives: Smoking has been identified as one of the main determinants of negative changes on the larynx histology. The purpose of this study is to investigate the voice characteristics and correlation between voice parameters of the smokers with vocal polyp or nodule or both of them. Materials and Method: MPT, $F_0$, jitter, shimmer, NHR of Korean /a/ vowel from 54 smokers and 50 nonsmokers diagnosed as vocal polyp or nodule were analyzed. A Computerized Speech Lab (4400) was for the analysis of each voice sample and statistical analysis was done by one-way ANOVA and Pearson correlation coefficient. Result and Conclusion: It showed that we can find difference between smokers and nonsmokers group in MPT, $F_0$, jitter, shimmer were different except NHR. each group shows difference in correlation coefficient between MPT, $F_0$, jitter, shimmer.