Splitter 급전 2소자 원편파 사각 패치 배열안테나의 설계

손태호,강상규,이병수,이용창,백경훈 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.2

Dual-fed circulary polarized microstrip 1 by 2 array antenna is designed and fabricated. To have circular polarization, we applied power splitter with 90 degree phase shifter by the length exetension. A 1 by 2 uniformed array antenna was designed and measured, and compared with theoretical values. The bandwidth characteristic is well coincided with the designed valued, but the center frequency for the GPS 1.575GHz differed sligthly by the reason of the substrate tolerance.

2개 기생소자에 의한 사각형 패치 안테나의 대역폭 확장

손태호,강상규,이병수,이용창,백경훈 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.2

This study is to extend bandwith for the microstrip antenna by parasitic patch devices. Applying two 1/4 wave length parasitic patches both side of microstrip patch, the bandwidth is able to be controlled by the parasitic couplings. We used the Tschebyscheff transformer for multisection matching network to give broadband transformation. It is designed for wireless MMDS CATV antenna and design antenna is fabricated by epoxy substrate of 1.2mm thickness, 4.4 relative permittivity. The theory is well agreed that the results of measurement of S11 has 2.88% band characteristic.

작은 피질하 병변에 대한 정위적 개두술 및 경-구 접근법

손병철,김문찬,이관성,박춘근,홍용길,강준기 대한신경외과학회 1999 Journal of Korean neurosurgical society Vol.28 No.12

경남 마산시 및 전남 승주군 일대에서 채집된 관박쥐의 중금속 오염에 관한 연구

손성원,민병윤,이두표 경남대학교 환경문제연구소 1989 환경연구 Vol.11 No.-

Investigation of heavy metals (Fe, Mn, Zn, Cu, Pb, Cd, and Hg) content accumulated in the greater horseshoe bat, Rhinolophus ferrumequinum, was carried out on samples collected from urban (Masan city) and rural (Sungju-gun) habitats. Toxic metals, Pb, Cd and Hg, were detected in all the samples analyzed, suggesting that both urban and rural populations were contaminated with these metals. However, differences of heavy metal concentation in the bats captured in urban and rural area were not found. This result may come from that bats have a long range(about 20~30 ㎞) of feeding habitats.

소액 지불 전자상거래 환경을 위한 프로토콜의 설계 및 구현

손병록,박기현,유상진 한국경영과학회 2001 經營 科學 Vol.18 No.1

An electronic micropayment system, one of electronic payment systems, is suitable especially when a small amount of money is to be paid frequently in order to purchase on-line goods (i.e., database search, software distribution, electronic news service, etc). In addition, since the amount of payment is small, possible damages caused by system failures are lower than other payment systems. In this paper, a micropayment protocol in electronic commerce environments on the internet is proposed, based on the PayWord system. And a micropayment electronic commerce system which executes the protocol proposed is implemented. Unlike the PayWord system, however, the micropayment protocol proposed in this paper is designed in such a way that a merchant does not need to request a payment at the end of every business day since a customer cannot purchase goods beyond length of hash chains, which is specified on a certificate. In addition, the system is able to check the validity as well as the duplicate spending of hash chains. The electronic micropayment system with the proposed protocol is consists of Customers, Merchants, and Brokers. Customers are implemented on Windows NT 4.0 using VC ++. Merchants are implemented on Solaris 2.5.1 and gcc 2.8.0 using Netscape Web Server and CGI methods. HP UX 10.20 is used for Brokers.

함입된 상악 중절치의 외과적 재위치 후 예후

민성진,최형준,류정아,김성오,이제호,최병재,손흥규 대한소아치과학회 2006 大韓小兒齒科學會誌 Vol.33 No.3

부산지역 소방공무원의 폐기능과 호흡기증상

김성훈,김정원,,김종은,손병철,김정호,이창희,장상환,이채관 大韓産業醫學會 2006 대한직업환경의학회지 Vol.18 No.2

목적: 본 연구에서는 소방관 집단의 호흡기 증상과 폐기능을 조사하여 호흡기 질환의 유병 정도를 비교 분석함으로써 소방관의 호흡기 질환과 화재 노출과의 관련성을 규명하고자 하였다. 방법: 2004년 11월 13일부터 동년 12월 15일까지 부산 소재 4개 소방서와 부속 파출소의 남성 소방공무원 699명을 대상으로 폐기능 검사와 호흡기 설문조사를 실시하였다. 호흡기 증상 설문은 BMRC에서 개발한 설문조사표를 이용하였다. FVC, FEV_(1), MMEF 예측치는 Morris의 폐기능 예측식을 사용하여 계산하였고, 폐기능 검사 이상을 판정하기 위하여 미국 NHNES 기준에 따라 정하였다. 폐기능 측정치와 호흡기 증상은 노출유무와 흡연여부로 집단을 나누어 각각 비교분석하였다. 유의수준은 p<0.05로 정하였다. 결과: 폐기능 비교에서 화재노출군이 FVC, FVC%, FEV_(1), FEV_(1)%, FEF_(25%)는 비노출군에 비해 통계학적으로 유의하게 저하되어 있었고, 이를 흡연여부에 따라 층화하였을 때, FVC 와 FEV_(1)은 흡연여부와 관계없이 노출 여부에 따른 차이를 보이나 FVC%, FEV_(1)%, PEFR은 흡연군에서만 차이를 보였다. 폐기능 검사 이상을 비교하면 전체적으로 화재노출군이 비노출군보다 폐기능 이상자의 수가 많았고 흡연군에서 FEV_(1) 이상자의 차이는 통계적으로 유의하였다. FVC, FEV_(1), MMEF를 종속변수로 하여 다중회귀분석을 시행하였을 때, FVC와 FEV_(1)은 부분적으로 화재노출유무와 관련성이 있었다. 호흡기 증상 조사에서 화재노출군은 비노출군에 비해 코막힘, 목아픔, 흉부압박감의 증상의 호소율이 통계학적으로 유의하게 높았으나, 이를 흡연여부에 따라 층화하면 이들 증상들은 경계역의 차이를 보였다. 결론: 이러한 결과들을 종합하면 소방관은 화재진압과정에서 노출되는 많은 호흡기 유독물질로 인해 급성 폐기능 저하와 높은 호흡기 증상 호소율을 보이며, 이는 화재노출 외에 흡연의 부가적 효과가 영향을 미친다고 생각된다. 따라서 폐기능이 저하된 경방군에서 주기적인 폐기능 검사가 실시되어야 하며, 금연과 호흡기 보호구의 철저한 착용이 권장되어야 하겠다. Objective: The purpose of this study was to evaluate the relationship between respiratory disorders and fire exposure by investigating and analyzing the lung function and respiratory symptoms of firefighters. Methods: The health effects of firefighting on respiratory function were investigated in 699 male fire officers in 4 fire departments in Busan by recording respiratory symptoms and measuring lung function. The data were analysed according to fire exposure and smoking habits. Results: Mean spirometric data showed significantly decreased levels in the fire-exposed group (FVC, -0.20 L; FVC%, -4.2%; FEV_(1) -0.21 L; FEV_(1)%, -5.1%; FEF25%, -0.13 L/SEE p<0.05). After stratification by smoking habits, FVC and FEV1 showed a significant difference between groups. The prevalence of spirometric abnormality was greater for the fire-exposed group than for the non-exposed group. Significantly higher prevalences of nasal stiffness (16.7% vs. 10.9%), sore throat (17.7% vs. 14.2%) and chest tightness (6.5% vs. 2.5%) were recorded in fire fighters compared to controls (p<0.05). However, after stratification by smoking habits, the 3 symptoms were showed only marginal differences in the smoking group. Conclusions: This study demonstrated that fire-exposed firefighters generally suffer a decline of lung function and a higher prevalence of respiratory symptoms. These results suggest that the exposure to routine firefighting activity is associated with adverse health effects to the respiratory system.

DC/DC 승압 컨버터의 출력 특성 개선을 위한 스너버 회로 설계

김성종,김인혁,정구종,손영익,한병문 明知大學校 産業技術硏究所 2009 産業技術硏究所論文集 Vol.28 No.-

Applications of DC!DC boost converters are increasing recently in many industrial areas including renewable energy sources. High switching frequency of the power semiconductor devices including MOSFET, IGBT causes the EMI noise owing to the large values of dv/dt and di/dt. Since the EMI noises degrade power efficiency and reliability of the system many researches have been made to reduce the noise. This paper presents a passive snubber circuit to improve the tum-on and turn-off transients of the pulsewidth modulated (PWM) DC/DC boost converters. The noises in the output voltage of the DC!DC converter are reduced by adding a resistor and an inductor to the circuit. Experimental results show the effectiveness of the proposed snubber circuit to improve the output characteristics of the boost converter.

오행화침법(五行和鍼法)의 이론적 고찰 및 운용

심성흠 ( Sung Heum Sim ),감철우 ( Cheol Woo Kam ),김진영 ( Jin Young Kim ),백상인 ( Sang In Baek ),이병권 ( Byung Gwon Lee ),손호영 ( Ho Young Son ) 대한경락경혈학회 2009 Korean Journal of Acupuncture Vol.26 No.4

Objectives: The object of this study is to report on the theory of Ohaeng-Hwa Acupuncture Therapy. Methods: The theory of Ohaeng-Hwa Acupuncture Therapy(OHAT; 五行和針法) is a part of the Five Elements Theory unique to Korea. This research Classic of Difficulty Issues-Nan Jing review Ohaeng-Hwa Acupuncture Therapy. Results: OHAT, created and developed by Jae-hoon Song, integrates the victor-vanquished as well as the son-mother relationship of the Five Elements of breakdown and restoration of balance between yin and yang. And also, it provides resources and data on The seventy fifth Nan(75難), The sixty ninth Nan(69難) of Classic of Difficulty Issues-Nan Jin 75, 69. OHAT establishes objectiveness and accuracy of diagnosis based upon the traditional method and procedure of pulse taking. In OHAT, a person`s state of illness is diagnosed by applying the comparative examination of the palpitation of the pulse. It is the fact that the pulse varies according to the state, and that OHAT treatment has proven the positive results by using the victor-vanquished relationship on The Nan Jin 75. On the basis of this, it is necessary to add the sixty ninth Nan(69難), to research the theory of the generation of the Five Element. Conclusions: Ohaeng-Hwa Acupuncture is very effective in treating the wide range of illness, and thus it has gained an increasing attention of many scholars and practitioners in the field of traditional Korean oriental medicine. However, it is the first theoretical attempt to the clinical research and scientific methodology of Ohaeng(Five) Ohaeng-Hwa Acupuncture, and more active Ohaeng-Hwa Acupuncture R&D is being conducted nationwide.

수 종의 도재 수복물에 부착된 세라믹 브라켓의 전단접착강도와 파절양상에 열순환이 미치는 영향

강상욱,손우성,박수병,김성식 대한치과교정학회 2009 대한치과교정학회지 Vol.39 No.4

본 연구는 도재 수복물에 부착된 단결정 세라믹 브라켓의 전단접착강도와 파절양상에 열순환과 도재 수복물의 종류가 어떤 영향을 미치는지 알아보기 위해 시행되었다. 도재전장관에 사용되는 재료들 중 Ceramco 3, Empress II, Zi-ceram/Vintage ZR 세 가지를 선택하여 각 20개씩 총 60개의 시편을 원반형태(두께 2 mm, 직경 12 mm)로 제작하였다. 동일한 접착 술식으로 세라믹 브라켓을 부착한 후 열순환을 시행한 실험군과 시행하지 않은 대조군, 두 군으로 나누어 전단접착강도와 파절양상을 평가하였다. 열순환을 하지 않은 대조군의 전단접착강도는 Ceramco 3는 7.06 ± 1.76 MPa, Empress II는 7.55 ± 2.38 MPa 그리고 Zi-ceram/Vintage ZR은 7.19 ± 1.38 MPa로 추천되는 전단접착강도(6 - 8 MPa)에 적합한 강도를 보였으나 열순환을 시행한 실험군은 전단접착강도가 유의하게 감소하였으며(p < 0.05) 열순환 후의 전단접착강도는 Ceramco 3는 4.88 ± 1.00 MPa, Empress II는 5.46 ± 1.35 MPa 그리고 Zi-ceram/ Vintage ZR은 4.84 ± 1.01 MPa로 임상적으로 추천되는 것보다 다소 낮은 값을 보였다. 도재의 종류에 따른 전단접착강도에는 유의한 차이가 없었다. 파절양상은 대조군에서는 모두 브라켓 기저부와 접착제 사이에서 파절이 일어났으며, 실험군에서는 2개의 시편(Ceramco 3과 Zi-ceram/Vintage ZR군에서 각 1개)만이 접착제내 파절을 보였으며 28개의 시편은 브라켓 기저부와 접착제 사이에서 파절이 일어났다. 이상의 연구 결과에서 보았을 때 도재 수복물의 종류에 따른 차이는 없었으나 열순환에 의해 전단접착강도가 약화되므로 실제 임상에서 고려되어야 할 것이다. Objective: The purpose of this study was to investigate the effect of thermocycling and type of porcelain restoration on shear bond strength (SBS) and mode of failure of monocrystalline ceramic brackets. Methods: A total of 60 porcelain discs were made and divided into three equal groups as follows: Ceramco 3, IPS Empress II, Zi-ceram/Vintage ZR. ceramic brackets were bonded to the prepared porcelain surfaces in the same manner. Each group was divided randomly into two subgroups: thermocycled group and non-thermocycled group (control). All samples were tested in shear mode on an universal testing machine. Results: SBS of the non-thermocycled group was clinically acceptable (Ceramco 3: 7.06 ± 1.76 MPa, IPS Empress II: 7.55 ± 2.38 MPa, Zi-ceram/ Vintage ZR: 7.19 ± 1.38 MPa). But, SBS of the thermocycled group was significantly reduced (Ceramco 3: 4.88 ± 1.00 MPa, IPS Empress II: 5.46 ± 1.35 MPa, Zi-ceram/Vintage ZR: 4.84 ± 1.01 MPa, p < 0.05). There was no difference between the shear bond strength by type of porcelain restoration. All bonding failure occurred between bracket base and adhesive, except for 2 samples. Conclusions: The results of this study suggest that the type of porcelain restoration did not affect SBS, but thermocycling weakened SBS. Therefore, the effect of thermocycling should be considered when using ceramic brackets in practice.