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A dynamic analysis of person and household activity and travel patterns using data from the first two waves in the Puget Sound Transportation Panel (1997)

Ma, Jun Konstadinos G.

Springer

Transportation 24 (1997), S. 309-331

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ISSN: 1572-9435

Keywords: activity analysis ; cluster analysis ; contingency tables ; dynamic behavioral analysis ; panel data ; travel patterns

Source: Springer Online Journal Archives 1860-2000

Topics: Architecture, Civil Engineering, Surveying

Notes: Abstract Daily activity participation and travel patterns are examined using data from the Puget Sound Transportation Panel (PSTP), which contains two-pairs of daily travel diary information (wave 1 in 1989 and wave 2 in 1990). Summary data of the travel diaries at the person and household levels are obtained using cluster analysis. At the person level, four clusters are found reasonable for both activity and travel. The four-cluster solutions indicate substantial day-to-day variation in activity participation and similarity in travel behavior over time. Temporal changes are analyzed using contingency table methods and log-linear models. The analysis reveals that activity participation and mobility present many regularities over time. Transitions within each wave show strong dependence between two days for both activity and travel, with higher dependency for the travel patterns than for the activity patterns. These are consistent when the analysis focuses on a longer period such as a year. Temporal dependencies appear to be stronger in the household-based than the person-based analysis. A hierarchical structure is also found in the relationship between activity and travel clusters. The link between activity and travel is much stronger within a day, weaker from one day to another, and the least strong from one year to the next. Important irregularities, however, are found and may be due to scheduling time-frames adopted by the respondents that are only partially captured in the data used.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1004955507098

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Increase of cyclin B by overexpression of cystatin α (1995)

Hiwasa, Takaki ; Ma, Jun ; Ike, Yoshimasa ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Cell Biochemistry and Function 13 (1995), S. 293-296

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ISSN: 0263-6484

Keywords: cyclin B ; cystatin α ; cysteine proteinase inhibitor ; inducible expression vector ; Chemistry ; Biochemistry and Biotechnology

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Biology , Medicine

Notes: Degradation of cyclin B was effectively suppressed when cells were treated with ALLN (N-acetylleucylleucylnorleucinal) which inhibits proteasome, calpain and cysteine proteinase cathepsins. In order to examine which protease degrades cyclin B, the effect of a cathepsin inhibitor, cystatin α, was investigated. The cystatin α gene was inserted into an inducible expression vector, pMSG, and transfected into NIH3T3 mouse fibroblasts. The expression of cystatin α was induced effectively in the transfected cells after treatment with dexamethasone. Overexpression of cystatin α resulted in an increase of the amount of cyclin B, suggesting that cysteine proteinase cathepsins might be involved in the degradation of cyclin B.

Additional Material: 3 Ill.