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문수덕,박재일,최경,황희용 강원대학교 정보통신연구소 2005 정보통신논문지 Vol.9 No.-
In this paper, A ultra wideband antenna with electromagnetically coupled feeding is presented. The designed antenna is composed of Bow-tie patch with parasitic patch ground of a semicircular shape. The measured bandwidth of the designed antenna is from 2.5GHz to 8.3GHz for -10dB return loss (VSWR < 2). This antenna shows a similar radiation pattern of monopole and maximum gain better than ideal dipole throughout the operating frequency band.
문수덕,김진규,황희용 강원대학교 산업기술연구소 2007 産業技術硏究 Vol.27 No.A
In High-Speed DSP systems, crosstalk between transmission lines of multi-channel can degrade the performance of equipment operations, This paper presents a microwave board to measure multi-channel coaxial cable assembly. The designed board has good performances from DC to 3 GHz, which have improved characteristic impedance, reduced crosstalk by using via fence, and low transmission loss. Using the designed board, we can measure characteristics of DUT(Device Under Test) such as return loss, insertion loss, crosstalk, phase delay, and characteristic impedance. The measured results are used to improve performances of a produced coaxial cable assembly.
Paraquat 중독환자의 초기검사로서 sodium dithionite를 이용한 소변내 paraquat검출의 임상적 의의
윤갑준,임경수,이진웅,김영식,이부수,박덕우,김선만,이강현,황성오,안무업 대한응급의학회 1995 대한응급의학회지 Vol.6 No.1
Background : Mortality from paraquat intoxication depends upon plasma paraquat concentration. To know the severity of paraquat intoxication is important for directing therapeutic modality and predicting prognosis. Sodium dithionite test for urinary paraquat provides an easy and simple method to determine the severity of paraquat intoxication in emergency department. purpose : To determine whether the result urinary paraquat test by sodium dithionite can predict outcome in patients with paraquat intoxication in emergency department. Subjects : 48 patients(male 31, female 17, mean age 37 years) who had exposure to paraquat and presented within 24 hours after exposure. Result : Thirty five patients were positive in paraquat urine test and thirteen patients were negative. Clinical manifestations were more severe in positive patients than in negatives. Complication was much more in positives than in negatives. 28 of 35 patients(80%) in positives and 2 of 13 patients(15%) in negatives died. Conclusion : Positive test for urinary paraquat is associated with high mortality and morbidity from paraquat intoxication, and qualitative test for urinary paraquat by sodium dithionite is an useful method to determine the severity of paraquat intoxication in emergency department.
48V Mild HEV용 양뱡향 DC-DC 컨버터 설계
황수빈(Soo-bin Hwang),전수민(Soo-min Jeon),이아라(A-ra Lee),방효진(Hyo-jin Bang),최덕관(Deok-kwan Choi),김종철(Jong-cheol Kim) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
48V Mild HEV consists of ISG(Integrated Starter & Generator), 48V Li-ion battery, 48V-12V bi-directional DC-DC Converter. This improve the vehicle’s fuel economy and reduce CO₂ emission by Stop/Start, Torque assist engine and regenerative brake. In the buck mode, the DC-DC converter supplies an electric power to 12V electrical load in the vehicle and charges the 12V battery. In the boost mode, it charge the 48V DC-link before 48V battery is connected, this can prevent the in-rush current from battery to DC-link. To optimize the size related with the number of phase in converter, the thermal analysis is necessary which consists with MOSFET power loss and thermal resistance. It is possible to approach the fast response and reduce the number of components by the bi-directional and multi-phase PWM IC. This also can reduce the size by replacing the electrolytic capacitor to MLCC(Multi-Layer Ceramic Capacitor). When the boost converter output is shorted because of any problems in 48V node, the bulk current flows from 12V battery to 48V node through the output diode. To protect this trouble in vehicle system, 48V node back to back protection switch is required. Those proposed design methods are verified through the calculation and the experiments.
Hwang, Il-Kyu,Park, Bum-Joo,Kim, Deok-Soo 한국경영과학회 1994 한국경영과학회 학술대회논문집 Vol.- No.1
The philosophy of object-oriented has found its role in various applications such as programming languages, databases, distributed systems, etc. Discussed in this paper is an experience of the object-oriented programming technique obtained while developing a particular CAD/CAM system. It has been well-known that the object-oriented programming language has good features enabling the improved reusability and extensibility of an existing code. The features include data abstraction, encapsulation, inheritance, polymorphism, and so on. This paper presents how these features of the object-oriented programming language, C++ in particular, can be applied to the implementation of geometric algorithms as well as graphical user interfaces.