• Journal of Digital Convergence
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• v.11 no.10
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• pp.737-746
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• 2013

This research aim is to investigate the rate and pattern of re-using the four-digit personal identification numbers(PINs). 1313 types of PINs were observed by 224 students who took this author's classes from last 2006 to 2011 at A-university. Some students used PINs as few as 3-4 and as many as 12-13. The average is 5.86 per person. The rates of re-using PINs were calculated by each student. 87%(195/224) of students reused PINs and 64% of them reused with just only one type of PINs, 20% reused with 2 types, and about 3% reused with 3-4 types. With respect to PINs, 884 out of the total 1313 PINs were reused, that is around 64.3%. In a broad sense, a pair of slight modification of PINs were also observed, that is, new PINs were partly matched in position or size of numbers of previous PINs. And if the reuse rate falling under the slight modification of PINs, 10.4% is added, about 75% of the PINs were reused in a broad sense. The re-using rate of male students is higher than the one of female students. This paper's results may provide to make plan for hacks of passwords.

• Journal of the Korean Society of Clothing and Textiles
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• v.21 no.8
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• pp.1406-1416
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• 1997

The purpose of this study is to find out an efficient way to utilize clothes. It will be pro- environmental effort besides enhancing clothing life. The study is based on a survey of daily clothing practices. Questionnaire is distributed to female college students who are majoring clothing, textiles, and/or home economics and their parents (n=254). ANOVA, Scheffe test, 1-test and regression are pursued respectively. The main results are as follows: 1. Students, mothers and fathers possess 50.3, 49.9, 45.4 unit clothes, respectively. Mothers possess more formal suits while students possess more casual clothes than the others. The possession pattern is affected by socio-economic variables such as income and purchasing price. 2. In the unused rate of clothes, students'(10.2%) and mothers'(9.7%) rate are significantly higher than that of fathers (6.9%). The unused rate and using efficiency of clothes are affected by socio-economic variables: income and age for unused rate; age and purchasing price for using efficiency. 3. The most important reason for unused clothes is found to be design and color of the clothes. Long years of possessing and change of fashion are the next important reasons. 4. Most of respondents are highly conscious of recycling their clothes. Most of them are willing to donate their clothes to others, re·use or exchange them with the others.