• 전자공학회논문지CI
• /
• 제48권3호
• /
• pp.91-101
• /
• 2011

정보통신 기술의 급격한 발전으로 인해 인터넷이 대중화됨에 따라 인터넷을 이용한 사이버 공간상에 정보의 상호교환, 전자 상거래, 인터넷뱅킹 등의 사회 활동이 활발해지고 있다. 하지만, 인터넷 사용의 편리함을 추구하는 경향에 의해 개인식별용 증명서(주민등록증, 운전면허증, 여권, 학생증 등)들이 전자적인 매체로 표현되어 인터넷상에서 노출되는 경우가 빈번하게 발생하고 있다. 따라서 본 연구에서는 인터넷상에 노출된 개인정보가 포함된 이미지들을 효율적으로 검색하기 위한 방안을 제안한다. 제안한 방안은 이미지의 색상과 질감, 그리고 모양 특징정보들 중에서 개인식별정보가 포함된 이미지들에서 고유한 특징정보들을 분석하여 추출한 후 이를 이용하여 개인식별정보가 포함된 이미지들을 검색한다. 제안한 방안을 실험한 결과, 전체 개인 식별정보가 포함된 이미지들 중에서 약 89%이상의 검색 성공률과 이미지 파일 당 수행시간은 약 0.17초가 소모되었다. 이러한 결과를 바탕으로 실제 인터넷상에서 개인식별정보가 포함된 이미지 파일들의 검색과 노출 여부 판단을 위한 시스템에 효과적으로 적용할 수 있다.

• 디지털콘텐츠학회 논문지
• /
• 제12권2호
• /
• pp.165-176
• /
• 2011

최근에 IT 산업이 발달하면서 디지털 콘텐츠를 보호하기 위한 DRM 기술에 관한 연구가 광범위하게 진행되고 있다. 이러한 기술을 사용하여 디지털 콘텐츠의 불법유통 및 복제를 방지함으로써 저작권자의 이익과 권리를 보호해 준다. 본 논문에서는 스마트카드 인증을 기반으로 하여 보안 기능이 강화되고 효과적인 프로토콜을 갖는 새로운 DRM 모델을 제안한다. 본 논문에서 제안한 모델은 기존의 WCDRM 모델에 비해 다음과 같은 장점을 갖는다. 첫째, 사용자의 고유정보를 보안기능이 강화된 스마트카드에 저장함으로서 공격자가 고유정보를 알 수 없도록 하여 복제방지를 강화한다. 둘째, 저작권자, 배포권자, 인증기관, 사용자 간의 프로토콜을 명확하게 하여 콘텐츠 암호화에 대한 서버의 부담을 줄인다. 셋째, 오프라인환경에서도 동작하며 스마트카드에 사용자의 고유정보를 저장하여 핵심적인 정보가 노출되는 것을 최소화한다. 또한 임의의 공격자에 대해 여러 가지 공격 매개변수에 대해 두 시스템을 비교하여 제안된 시스템이 우위에 있음을 보인다.

• 디지털융복합연구
• /
• 제16권9호
• /
• pp.347-357
• /
• 2018

본 연구의 목적은 간호대학생의 세계시민의식, 셀프리더십과 국제보건역량과의 관계를 파악하고 국제보건역량 증진을 위한 교육프로그램 개발의 기초자료로 활용하기 위함이다. 연구대상자는 B광역시 소재 2개 대학교와 K시 소재 1개 대학교에 재학 중인 간호대학생 207명을 대상으로 설문을 실시하였다. 자료분석은 SPSS PC 18.0을 이용하여 t-test, ANOVA, Pearson's Correlation으로 분석하였다. 연구결과 종교, 국제보건역량관련 교육유무, 국제보건 관련 대중매체 접촉경험에서 통계적으로 유의한 차이가 있었다. 대상자의 국제보건역량은 셀프리더십(r=.372, p<.01), 세계시민의식(r=.364, p<.01)과 중간정도의 상관계를 보였고 세계시민의식은 셀프리더십(r=.463, p<.01)과 강한 상관관계를 나타냈다. 본 연구 결과를 토대로 간호대학생을 위한 국제보건역량 증진 프로그램 개발 시 세계시민의식과 셀프리더십을 고려하여 개발할 필요가 있으며 그 효과를 검증하는 연구가 필요하다.

• 한국산업보건학회지
• /
• 제25권3호
• /
• pp.328-337
• /
• 2015

Objectives: The purpose of this study is to investigate differences in concentration according to the position at the left or right shoulder within a 30 cm of radius of workers' respirators and provide basic data for the establishment of an industrial health policy. Methods: Personal samples were collected from a total of 65 workers from 27 manufacturing firms in South Gyeongsang-do Province from November 5, 2011 to December 30, 2012 after classifying the laborers into left- and right-side groups. The organic compound samples were collected and analyzed in accordance with the NIOSH Manual of Analytical Methods (NMAM) 1501. Results: In terms of the concentration of organic compounds collected from both left and right shoulders at the position of workers' respirators, isobutyl acetate was the highest with 145 ppm at the left shoulder, followed by ethyl acetate (133.5 ppm) and toluene (38.13 ppm). At the right shoulder, on the contrary, ethyl acetate (149.3 ppm) was the highest, followed by toluene (46.26 ppm), xylene (29.63ppm) and isopropyl alcohol (28.06 ppm). Overall, the right shoulder was higher than the left shoulder in terms of concentrations. Conclusions: For the measurement of the working environment, workers' personal samples should be collected at the place closest to the respirator. In terms of the reduction of error, the attachment of two sample media is expected to reduce errors in exposure assessment.

• 에너지공학
• /
• 제15권3호
• /
• pp.146-153
• /
• 2006

중 저준위 방사성폐기물 유리화 공정에서 발생되는 분진을 제거하기 위하여 저온용융로 후단에 금속필터를 장착하여 성능시험 및 필터 적용 평가를 실시하였다. 실험결과 기존의 고온세라믹필터와 유사한 차압특성을 보였으며, 유량 $110Nm^{3}/hr$ 기준으로, 필터 자체에 의한 압력손실은 $25mmH_{2}O$, 분진 잔류층에 의한 압력손실은 $67mmH_{2}O$ 정도였다. 따라서 기저차압은 $92mmH_{2}O$ 정도임을 확인할 수 있었다. 또한 SEM-EDS 분석결과 대부분의 차압은 멤브레인층의 표면에서 발생된 것으로 판단되며, 열화현상에 의한 부식문제등도 발견되지 않았다. 따라서 금속필터의 경우 유리화설비에 적용 가능한지를 분석하고, 장기시험을 통한 충분한 검증이 필요할 것으로 판단된다.

• 한국안전학회지
• /
• 제21권3호
• /
• pp.53-58
• /
• 2006

Following a Mediterranean fruit fly outbreak in South Australia, a bait spray program involving the pesticides like malathion(MAL) was carried out. During the application, dermal exposure was considered for the pest controllers wearing PVC gloves. However there is a lack of information about PVC glove performance like break through times and permeation rates with MAL, therefore, a new analytical method for HPLC-UV was developed. A standard permeation test cell was used in this study. From the results of this study, more than 96% solubility of MAL was provided at 30% isopropyl alcohol in distilled water as a collecting media. However, there was significant decomposition of MAL when the solutions were kept at over $50^{\circ}C$ for 2-3 hours. As a mobile phase, 50% acetonitrile water solution (pH 6.0) gave the greater sensitivity compared with other compositions of acetonitrile solution. The arm section of the gloves had shorter breakthrough times and higher permeation rates compared with the palm. There was no malathion solution breakthrough up to 24 hours using the 1% MAL working strength solution. When the temperature was changed from $22{\pm}1^{\circ}C\;to\;37{\pm}1^{\circ}C$, the breakthrough times were decreased by 14.5% on palm and 37.5% on arm, and permeation rates were increased significantly. The findings of this study indicate that further investigations on used gloves, periods of use and varying working conditions like tasks and seasons should be carried out to assess potential worst case scenarios.

• Toxicological Research
• /
• 제22권2호
• /
• pp.127-133
• /
• 2006

Recently, we have reported that the environmental pollutant 2-bromopropane (2-BP) induces a significant embryo-fetal developmental toxicity in rats. However, the cause of developmental toxicity and the relationship between maternal and developmental toxicities could not be elucidated because the developmental toxicity of 2-BP was observed only in the presence of maternal toxicity The in vitro teratogenicity study using whole embryo culture was carried out to understand the teratogenic properties and the possible mechanism of teratogenicity induced by 2-BP in rats. Rat embryos aged 9.5 days were cultured in vitro for 48 hrs at medium concentrations of 0, 1, 3, or 10 mg/ml of 2-BP. Embryos were evaluated for growth, differentiation, and morphological alterations at the end of the culture period. At 10 mg/ml, 2-BP caused a delay in the growth and differentiation of embryos and an increase in the incidence of morphological alterations, including altered yolk sac circulation, abnormal axial rotation, craniofacial hypoplasia, open neuropore, absent optic vesicle and kinked somites. At 3 mg/ml, only a delay in the growth and differentiation of embryos was observed. There were no adverse effects on embryonic growth and development at the concentration of 1 mg/ml. The results showed that the exposure of 2-BP to rat embryos results in a developmental delay and morphological alterations at dose levels of 3 mg/ml culture media or higher and that 2-BP can induce a direct developmental toxicity in rat embryos.

• 한국식생활문화학회지
• /
• 제17권2호
• /
• pp.141-152
• /
• 2002

This study provides a national examination on youths' 'understanding' of irradiated food. The 1,200 subjects of the survey were randomly sampled from male and female students throughout the nation, between grades five and eleven. The survey was conducted toward these samples in November 2000. The number of respondents with exposure to irradiated food was so small, amounting to only 4.0 percent of the whole sample. The core concept used in this study is 'impression'. An impression is information about a specific subject, which carries significance to an individual. The results show that the higher the grade was, the more value the contents of impression contained. Furthermore, impressions concerning atomic or nuclear energy, and radioactivity increased greatly among students in middle school and above. Providing information of effects and advantages of irradiated food was focused to increase positive impressions and decrease the negative ones more greatly than providing simple factual information. Youths showed less value-centered impressions of irradiated food and more impressions centered on fragmented facts than adults. Respondents previously exposed irradiated food were shown to acquire the most of their information from the television and newspaper media. Among six information sources presented in the survey, youths pointed out 'science and technology research institutes' as the most credible. International organizations and environmental/ consumer organizations were evaluated as having relatively high credibility. Providing simple factual information of irradiated food did not seem to bring about any difference to the intention of purchasing irradiated food. On the other hand, respondents provided with effects-included information showed an increase in such intention. Our research results of the youth show a notable difference with that of the adults. Thus, programs and strategies to enhance youths' understanding should differ from those concerning adults.

• 한국생활과학회지
• /
• 제8권2호
• /
• pp.399-417
• /
• 1999

Viewers have always switched channels and they have selected by turning away from the TV and returning to the set when the content seemed more amusing. Also, people usually watch television with their family members and thus the experience of viewing is embedded uniquely in ongoing processes of family interaction. In other words, people develop patterns and habits through the act of viewing together. As viewing with family members is the most frequent mode of media exposure, the context of family viewing needs to be thoroughly examined if we are to understand the family's use of television. The purpose of this paper is to investigate the dynamic nature of television viewing behavior. With the people meter's second-by-second viewing information, first we analyze who, when, and why viewers change channels. The ensuing reduction of advertising impact due to zapping will be investigated as well. Then the focus will be shifted to the dynamic interaction of coviewing among family members. In order to further explore the in-depth nature of television viewing, actual viewing information should be cross-analyzed with respect to both demographic and psychographic variables. In this study we surveyed individual characteristics such as television watching patterns, program type preference, attitude toward commercials, channel control intensity, and personalities. We have demonstrated that the results of an meticulus analysis of survey data provide valuable insights into the dynamics of television viewing among family members.

• Environmental Analysis Health and Toxicology
• /
• 제25권1호
• /
• pp.41-55
• /
• 2010

The aims of this study were to develop the suitable "system software" in chemical ranking and scoring (CRS) for the food hazardous chemicals associated with environmental emission and to suggest the priority lists of food contamination by environmental-origined pollutants. Study materials were selected with reference to the priority pollutants list for environment and food management from domestic and foreign research and the number of study materials is 103 pollutants (18 heavy metals, 10 PBTs, 10 EDs, and 65 organic compounds). The Food-CRS-Korea system consisted of the environmental fate model via multimedia, transfer environment to food model, and health risk assessment by contaminated food intake. We have established that health risks of excess cancer risks, hazard quotients (HQs) by chronic toxicity and HQs by reproductive toxicity convert to score, respectively. The creditable scoring system was designed to consider uncertainty of quantitative risk assessment based on VOI (Value-Of-Information). The predictability of the Food-CRS-Korea model was evaluated by comparing the presumable values and the measured ones of the environmental media and foodstuffs. The priority lists based on emissions with background-level-correction are 15 pollutants such as arsenic, cadmium, and etc. The priority lists based on environmental monitoring date are 17 pollutants including DEHP, TCDD, and so on. Consequently, we suggested the priority lists of 13 pollutants by considering the several emission and exposure scenarios. According to the Food-CRS-Korea system, arsenics, cadmium, chromes, DEHP, leads, and nickels have high health risk rates and reliable grades.