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텔레매틱스 서비스를 위한 차량 내 2.4GHz 대역의 근거리 무선 통신 환경 측정 시스템 구현
허수정,이승환,박용완,신정훈 대한임베디드공학회 2006 대한임베디드공학회논문지 Vol.1 No.2
t appears that it is possible for us to make a wireless communication of even home-network system within car by integrating with the Ubiquitous such as mobile phone, wireless Internet, GPS and DMB in the future. If the present wireless surroundings within the car are connected with very high-speed wireless network as measurement system for wireless communication surroundings within this car in the future, it will develop the complicated communication conditions such as safe checkup, communication between systems within car, and wireless communication for user entertainment unlike universal communication conditions. Accordingly, there is the necessity of the device that can measure the interference of electric wave, communication speed and communication quality by a kind of each car. This paper aims at making the real measurement device to raise the reliability of each Application for inquiring into the interference about each other in the frequency band used under Telematics surroundings.
허수정,박용완 한국통신학회 2017 정보와 통신 Vol.34 No.4
본고에서는 실내환경에서 측위 정확도의 요구가 높아지고 있는 시점에서 전파시스템 기반 측위 시스템 및 알고리즘이 가진 문제점을 해결하기 위해 지구고유의 자원인 지구자기장을 기반으로 실내환경에 강인한 측위 시스템 및 알고리즘에 적용 가능성을 제시한다. 본 연구를 통해 건물재료 및 공간구성에 따른 지구자기장세기 변화량이 다른 것을 확인 하였으며, 위치추정을 위한 Fingerprint 알고리즘 적용 시Database 구축의 편의성, 효율성을 높이기 위한 방법을 제안하고 실제 환경 실험을 통해 그 우수성을 검증하였다.
압전변압기용 $Pb(Mn_{1/3}Sb_{2/3})O_3-PZT$ 세라믹스에서 승온속도 및 $V_2O_5$ 첨가가 치밀화 및 전기적 특성에 미치는 영향
허수정,손준호,손정호,이준형,김정주,정우환,박명식,조상희 한국세라믹학회 2000 한국세라믹학회지 Vol.37 No.4
The effect of V2O5 addition on the low temperature sintering of Pb(Mn1/3Sb2/3)O3-PZT ceramics, which is known as a prominent material for piezoelectric transformer application was studied, and the densification behavior and piezoelectric characteristics of the samples as a function of heating rate were also examined. V2O5 led the system to liquid phase sintering by forming liquid phase during sintering, which accelerated densification through the particle rearrangement in the early stage of sintering. The liquid phase mostly existed at grain boundaries retarded the evaporation of PbO, while the densification temperature and the weight loss of V2O5-free samples were higher than those of samples with V2O5. Faster heating improved the densification of the samples regardless of V2O5 addition. The low temperature sintering at 100$0^{\circ}C$ was achieved in PMS-PZT ceramics with high density and reasonable dielectric and piezoelectric characteristics. This result revealed optimistic way to the development of multi-layered piezoelectric transformers.
알칼리분해를 이용한 어류 중 다환방향족탄화수소의 전처리 방법
허수정,이효민,채영주,유은아 한국분석과학회 2005 분석과학 Vol.18 No.5
Polycyclic Aromatic Hydrocarbons(PAHs) contamination arises from several sources including processing of food(smoking, direct drying, cooking) and environmental contamination of air, water, or soil, the later being considered as the most important. In this study, to establish the analytical method for some PAHs[benzo(a)anthracene, chrysene, benzo(b)fluoranthene, benzo(k)fluoranthene, benzo(a)pyrene, dibenzo(a,h) anthracene, benzo(g,h,i)perylene, indeno(1,2,3-c,d)pyrene] in fish, alkali digestion time, extraction solvents, elution volume of florisil cartridge for clean-up have been optimized. The methodology involved saponification and extraction with n-hexane, clean-up on Sep-Pak florisil cartridges and determination by HPLC/FLD(High Performance Liquid Chromatography/Fluorescence Detector). Overall method recoveries for 8 PAHs spiked into these products ranged from 90 to 106%.