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Tsujii, Toshiaki,Fujiwara, Takeshi,Kubota, Tetsunari,Satirapod, Chalermchon,Supnithi, Pornchai,Tsugawa, Takuya,Lee, Hungkyu Korean Society of Surveying 2012 한국측량학회지 Vol.30 No.6
Ionospheric anomaly is one of the major error sources which deteriorate the GNSS performance. In the equatorial region, effects of the ionospheric plasma bubbles are of great interest because they are pretty common phenomena, especially in the period of the high solar activity. In order to evaluate the GNSS performance under circumstance of the bubbles, an ionospheric scintillation monitor has been developed and installed in Bangkok, Thailand. Furthermore, a model simulating the ionospheric delay and scintillation due to the bubbles has been developed. Based on these developments, the effects of the simulated plasma bubbles are analyzed and their agreement with the real observation is demonstrated. An availability degradation of the GPS ground based augmentation system (GBAS) caused by the bubbles is exampled in details. Finally, an integrated GPS/INS approach based on the Doppler frequency is proposed to remedy the deterioration.
Measuring Multipath Error of a Pseudo Quasi-Zenith Satellite
Toshiaki Tsujii,Hiroshi Tomita,Yoshinori Okuno,Ivan Petrovski,Masahiro Asako,Kazuki Okano 한국항해항만학회 2006 한국항해항만학회 학술대회논문집 Vol.2 No.-
Japan has been investigating a new satellite based positioning system called Quasi-Zenith Satellite System (QZSS). Since the improvement of positioning availability in urban area is one of the most important advantages of the QZSS, multipath mitigation is a key factor for the QZSS positioning system. Therefore, Japan Aerospace Exploration Agency (JAXA) and GNSS Inc. have commenced the R&D of a pseudolite, which transmits the next-generation signal such as BOC(1,1), in order to evaluate the effect of multipath on the new signal. A prototype BOC pseudolite was developed in 2005, and ground tests showed a capability of generating proper pseudorange. Also, preliminary flight experiments using a pseudo quasi-zenith satellite, a helicopter on which the pseudolite is installed, were conducted in early 2006, and the BOC-type correlation function was monitored in real time.
Development of INS-aided GPS Tracking Loop and Preliminary Flight Test
Toshiaki Tsujii,Takeshi Fujiwara,Yoshimitsu Suganuma,Hiroshi Tomita,Ivan Petrovski 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Robust tracking of GNSS signal in a harsh environment such as a severe ionospheric scintillation is achallenge for civil aviation. The use of inertial sensor would improve the tracking performance since the Doppler frequency caused by aircraft dynamics could be compensated by the inertial measurements. In order to evaluate such an aiding, an INS aided GPS tracking loop was developed by using a software receiver, and a preliminary flight test was conducted. Off-line analyses showed a reduced carrier phase error and a possible reduction of noise band width in tracking loop, which would result in positioning accuracy improvement.
A New Formalism for Lexical Transfer
Jun-ichi, Tsujii,Kimikazu, Fujita 서울대학교 어학연구소 1990 語學硏究 Vol.26 No.4
The lexical transfer has been one of major sources of difficulties in MT. Apart from difficulties of selecting appropriate target equivalent words, systematic structural correspondences between two languages are often violated by idiosyncracies of lexical correspondences. We can hardly expect to have systematic theories of lexical transfer which generalize idiosyncracies in lexical correspondences. What we can do is to prepare a framework in which we can accumulate systematically idiosyncratic knowledge concerned with lexical correspondences. In this paper, we propose a framework based on bilingual signs for lexical transfer. Through definitions of bilingual signs, not only local linguistic structures of two languages but also predicates which are used for specifying extra-linguistic knowledge are related with each other. Furthermore, by using explicit specifications of mutual relationships between bilingual signs, the system can formulate meaningful questions for disambiguating "transfer ambiguities" during lexical trnasfer. Compared with converntional bilingual dictionaries, our proposed framework has several desirable properties such as declarativeness, reversibility and flexible interface with extralinguistic processings. A rough sketch of the transfer phase which is based on constraint relaxation is also given.
Compost of Swine Manure Slurry Using the Thermophilic Aerobic Oxidation (TAO) Syst
Lee, W.I.,Tsujii, H.,Lee, M.G.,Cha, G.C.,Chung, J.C. The Korean Society of Animal Environmental Science 2004 축산시설환경학회지 Vol.10 No.1
현장규모 (8.6${\times}$2.5${\times}$2.4 m) 및 파이롯트규모 (1.39${\times}$0.89${\times}$0.89 m)의 고온호기산화장치를 이용하여 공기투입량 및 처리온도에 따른 양돈분뇨의 감량화 효율을 검토하였다. 현장규모에서 공기투입장치, 거품제거장치의 설치조건이 양돈슬러리 증발량과 처리온도에 모두 영향을 미치고 있음을 알 수 있었다. 현장규모 연구는 3가지의 처리방법 (처리A:공기공급량 120㎥/h, 수중펌프 2대, 소포장치2대: 처리 B: 공기공급량 180㎥/h, 수중펌프 3대, 소포장치 3대; 처리C: 공기공급량 180㎥/h, 수중펌프 3대, 소포장치 4대)으로 실행되었다. 1일 5㎥ 양돈슬러리를 동일하게 투입하면서 얻어진 연구결과, 수위변화, 온도변화 및 증발량은 각각 처리A: 50∼100cm, 31∼$64^{\circ}C$, 55L/$\m^2$ㆍday, 처리B: 40∼90cm, 29∼$52^{\circ}C$, 75L/$\m^2$ㆍday, 처리C: 40∼70cm, 45∼$54^{\circ}C$, 120L/$\m^2$ㆍday이었다. 한편 파이롯트 규모 연구는 반 연속식으로 양돈분뇨를 투입하면서 매일 투입량을 처리1: 50L/2h, 처리2: 50L/3h, 처리3: 40L/3h, 처리4: 60L/4h으로 하여 최대 슬러리 감량조건을 도출하기 위해 수행하였다. A field-scale(8.6${\times}$2.5${\times}$2.4 m) and pilot-scale(1.39${\times}$0.89${\times}$0.89 m) thermophilic aerobic oxidation (TAO) units were installed to investigate the volume reduction efficiency of slurry, by varying the aeration and treatment temperature of swine manure, and the collected liquid was evaluated as a liquid fertilizer. In the field-scale unit, the aeration level and numbers of foam breakers made different effects on the slurry volume and temperature in the TAO system. The experiments were peformed for three cases, using different levels of aeration and numbers of foam breakers: Treat-A (aeration rate; 120 ㎥ air/hr using 2 air pumps and 2 foam breakers), Treat-B (aeration rate; 180 ㎥ air/hr using 3 air pumps and 3 foam breakers) and Treat-C (aeration rate; 180 ㎥ air/hr using 3 air pumps and 4 foam breakers). With the same input volume (5 ㎥/day) of swine manure slurry, the resulting liquid levels, temperatures and evaporation rates were 50∼100 cm, 31∼$64^{\circ}C$ and 55 $\ell/m^2$/day for Treat-A; 40∼90 cm, 29∼$52^{\circ}C$ and 75 $\ell/m^2$/day for Treat-B; and 40∼70 cm, 45∼$54^{\circ}C$ and 120.0 $\ell/m^2$/day for Treat-C. In the pilot-scale unit, semi-continuous flow of swine manure slurry was introduced. 50 $\ell$ every 2hr(T-1), 50 $\ell$ every 3hr(T-2), 40 $\ell$ every 2hr (T-3) and 60 $\ell$ every 4hr (T-4) within 24 hours, in order to find the maximum slurry volume reduction conditions.