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셀룰러방식 이동전화용 저잡음 증폭기의 설계에 관한 연구
최병하 木浦海洋大學校 1998 論文集 Vol.6 No.2
In designing RF amplifiers two methods are frequently. One is to design small signal amplifiers using S-parameters, the other one is to design large signal amplifiers with equivalent input/output impedance networks for transistor. In this paper, Low Noise Amplifier is designed using S-parameters for the cellular-phone Designing focuses are low cost and improvements of the performance.
崔朝天,崔炳夏 木浦海洋大學校 1996 論文集 Vol.4 No.1
The Korean DBS(MUGUNGWHA-1) has been seated on the GEO(Geostationary Earth Orbet) for the TV satellite broadcasting service form July 1996. The MUGUNGWHA can expert the several broadcasting service and ISDB(Intergrated Service Digital Broadcating) by the digital system, that has the coverage of the Korean, Korean islands and their neighbor sea. However, the satellite receiving in case of ships has some special problems which is many kinds of irregulary motion cause by pitch, roll, yow and turning etc.. Therefore, the broadcast receiving in ship must be necessaried the satellite tracking system using anti-motion control. This paper is studied about the tracking antenna system for a shipborne satellite TV receiving.
최월용,정효진,채종인,하태인,정상렬,이광재,채병도,최영식 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1
Teratomas are embryonal neoplasms that show characteristics of three germ cell layers(ectoderm, mesoderm, and endoderm). They are distributed in the following regions: sacrococcygeal(57%), gonadal(29%), mediastinal(7%), cervical(3%), retroperitoneal(4%), and intracranial(3%) regions. Non-gonadal treatomas present in infancy whereas gonadal are seen in adolescence. Especially, teratomas that occurred in midline neck of adult are very rare and are confused with thyroglossal duct cysts, cystic hygromas, and thyroid tumors. We report, along with the review of appropriate literature, a case of histopathologically confirmed benign teratoma in the midline neck of a 33 years old woman.
최병하 木浦海洋大學校 2000 論文集 Vol.8 No.2
This paper has designed and fabricated the low power transmitter and receiver to use 447MHz. The properties have been satisfied the several characteristics to provide the Radio Administration-Law. And so, It is possible to use fabrication the lifesaving low power radio system.
최병하 木浦海洋大學校 1999 論文集 Vol.7 No.2
Nowadays, many radio communication apparatus is used to the CDMA System. This paper has been studied on the inspection-inventory, improvement scheme and inspection technology of the CDMA system and Terrestrial Digital TV. To this result, it must be to add a measurement of ρ and Code Domain Power in the COMA. AND so, it is necessary to measure of the Out-Band Radiated Characteristic, Desired to Undesired Ration, In-Band Radiated Characteristic, Desired to Undesired Ratio, In-Band signal Characteristic, Inter Symbol Interference and Bit Error Rate in the Terrestrial Digital TV.
崔秉河,卞種秀,李相韓 慶北大學校 齒科大學 1985 慶北齒大論文集 Vol.2 No.1
The author studied the heart rate changes of 150 adult patients (79 male and 71 females above 18-years old) under dental local anesthesia, and heart rate changes for breathholding alone of 20 patients. The heart rate is best reflection of the activity of the autonomic nerve system and the easiest physiological sign to monitor. The purpose of this study was to find out cardiac activity under dental local anesthesia, thereafter to clarify the mechanism of syncope from the aspect of trigeminal-vagal reflex. The studied group were devided into four. GⅠ: Local anesthesia with a different agent by epinephrine concentration and normal saline as a control. GⅡ: Local anesthesia after premedication of atropione. GⅢ: Local anesthesia under the general aensthesia. GⅣ: Heart rate changes for breathholding alone. The result were as follows: The heart rate was decreased in 138(92%) of 150 patients during local anesthetic injection, and increascd after injection. This means the possible participation of trigeminal-vagal reflex in producing heart rate decrease. Mean maximum decrease rate of G I was 14.2±7.54%, and not affected by anesthetic agents(p>0.05) Mean value (GⅡ) was 6.89±4.38%, which means that atropine inhibits the reflex partially(p<0.05). Mean value (GⅢ) was 1.20±0.77%, which means that general anesthesia blocked the reflex completly. Mean value (GⅣ) was 6.58±3.13%, which is not reached to changes by local anesthesia.
최병호,유재하 大韓顎顔面成形再建外科學會 1995 Maxillofacial Plastic Reconstructive Surgery Vol.17 No.4
To use cultured mucosa as a graft of full thickness, our laboratory has been involved in the development of techniques to grow epidermis together with connective tissue. Human oral mucosa was obtained at dental surgery. Under sterile conditions the tissues were cut into explants of 0.1 cm² which were placed in the center of 24 well tissue culture dishes and incubated in a growth medium. The growth medium used for epithelial was MEM(Minimum Essential Medium) supplemented with 10% fetal calf serum, 0.5% dimethyl sulfoxide, glutamine (0.292 g/l), epidermal growth factor (40 ug/ml), cholera toxin (30 ng/ml), hydrocortisone(2 ug/ml), insulin (40 ug/ml) and transferin (5 ug/ml). The medium for stratification of epithelial cells was MEM supplemented with 10% fetal calf serum, 0.5% dimethyl sulfoxide and glutamine (0.292 g/l). The medium used for fibroblasts was MEM supplemented with 10% fetal calf serum. With the three types of media used alternatively, a mucosa composed of epidermis and connective tissue was obtained after 3 weeks of culture.
鹽水溶液에서 스테인레스鋼의 孔蝕에 미치는 添加劑의 영향
崔丙鎭,金大龍,尹秉河 경북대학교 공과대학 1986 工大硏究誌 Vol.15 No.-
A statistic method was employed through galvano-static experiments in this study of pitting corrosion of SUS 430 stainless steel. When ethylen-diamine (NH_2-CH_2-CH_2-HN_2) as an inhibitor and ferric chloride(FeCl_3) as an aggressive agent are added to corrosive medium, those additives affect on the size, distribution and total number of pits formed. Which can be explained by means of potential barriers at the moment of pits' nucleation. And the largest pit, appeared as a peak in the pits' distribution curve, occupied the majority part of total pits' volume.