• Title/Summary/Keyword: 이정직

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Performance of Wireless Home Networking Systems in the 2.4GHz band (2.4GHz 대역 무선 홈네트워킹 시스템의 성능 비교)

  • 김동호;이정도;강희조
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2001.10a
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    • pp.693-696
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    • 2001
  • 본 논문에서는 무선 홈네트워킹 시스템으로 대두되고 있는 Wireless LAN(802.11), HomeRF, Bluetooth 성능을 간섭이 고려되지 않는 경우의 실내 무선 환경하에서 시스템의 변조 방식만을 고려하였으며 실내환경에서 발생되는 에러에 대한 제어 기술로 Truncated Type-B Hybrid ARQ를 적용하였다. 무선 홈네트워킹 시스템의 채널 수 및 주파수 대역은 동일하며 실내 무선 환경을 라이시안 페이딩 환경으로 고려하였을 경우, 직직접파 대 반사파 전력비(K)가 6[dB]인 라이시안 페이딩 환경하에서 오율 $10^{-3}$을 기준으로 할 때 2FSK가 DQPSK보다는 E$_{b}$ /N$_{o}$ 가 약 3[dB] 정도 우수하며 오율 $10^{-6}$을 기준으로 비교하여 보면, DPSK 방식이 4FSK 보다 약 E$_{b}$ /N$_{o}$ 가 5[dB] 우수하였다. 또한 K=6인 라이시안 환경하에서 변조 방식만을 고려한 경우보다 성능 개선 기법을 채용한 무선 홈네트워킹 시스템의 E$_{b}$ /N$_{o}$ 가 더 우수함을 알 수 있었다.

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디지털 증거 수집과 분석을 위한 스마트폰 포렌식 적용 연구

  • Lee, Jeong-Hoon;Chun, Woo-Sung
    • Review of KIISC
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    • v.21 no.6
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    • pp.57-66
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    • 2011
  • 국내 스마트폰의 사용자는 2천만 명에 도달하고 있고, Wi-Fi Zone과 3G망 뿐만 아니라, 4G WiBro와 LTE로 속도까지 향상 되어 스마트폰의 활용은 더욱 높아지고 있다. 또한 일부 스마트폰 사용자들은 본인의 스마트폰 단말기를 해킹과 루팅을 통하여 멀티미디어 콘텐츠를 불법으로 이용하고 있다. 이는 한 미 FTA체결에 저작권의 법적 문제제기가 있다. 또한 기존의 이동통신 2G, 3G 휴대폰들과 스마트폰은 휴대용 이용기기로서, 범죄에 사용되는 직간접 증거들과 관련성이 높아서, 휴대폰과 스마트폰에서 생성 저장된 디지털 증거에 대한 스마트폰 포렌식 적용에 대한 연구가 필요하다. 스마트폰은 휴대폰 보다 다양한 기능을 지원해주기 때문에 스마트폰의 사용정보에는 연락처, 통화기록, 인터넷, 메세지, 사진, 동영상 등의 많은 정보를 가지고 있으며 이러한 정보는 포렌식 수사 과정에서 사용자의 행위를 유추하는데 도움이 될 수 있다. 본 디지털 증거 수집과 분석을 위한 스마트폰 포렌식 적용에서는 법정에서 사용될 포렌식 증거의 수집과 분석을 위한 압수 수색 방법과 주의할 점을 연구하였다.

The Mediating Effect of Cognitive Function on Climacteric Symptoms and Quality of Life in the Middle-aged Women (중년여성의 갱년기 증상과 삶의 질의 관계에 대한 인지기능의 매개효과)

  • Lee, Jeong-Hwa;Kim, Kyung-Hae;Kim, Gyung-Duck
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.7
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    • pp.4439-4448
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    • 2014
  • This study was conducted to extend the understanding and knowledge by examining the effect of climacteric symptoms and the cognitive function on QoL(Quality of life) of middle aged women. This study was conducted from March 2nd to March 10th, 2014. The data was collected by self-report questionnaires from 204 middle aged women. There was a significantly positive correlation between the climacteric symptoms and cognitive function. A significantly negative correlation was observed between the climacteric symptoms and QoL. The climacteric symptoms were a direct predictor and an indirect predicator of QoL mediated by the cognitive function. The study suggests that nursing intervention is needed to manage the climacteric symptoms and cognitive function for improving the QoL of middle aged women.

Perceived Equity, Role Stress and Life Satisfaction of Married Working-Mother Salesclerks (판매직 주부의 공평성인지도 ${\cdot}$ 역할스트레스 및 생활만족도에 관한 연구)

  • Jeong, Jin-Hee;Lee, Jeong-Woo
    • Journal of the Korean Home Economics Association
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    • v.43 no.2
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    • pp.81-103
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    • 2005
  • The main purpose of the research was to prove, in a practical sense, the relationship among perceived equity, role stress and life satisfaction of employed wives working in sales departments. The subjects were employed wives working in sales departments who have at least one child and a spouse, living in Seoul and the Metropolitan area. The final data analysis used 487 out of 668 questionnaires. Statistical analyses were carried out using SPSS/PC WIN which included frequencies, mean, percentages, Pearson's correlation, Cronbach's ${\alpha}$, factor analysis, multiple regression analysis. The findings of the study were as follows: 1) As their education level was low, the education level of their spouse was high, the communication level between couples was high, and the self-oriented perfectionism was low, their perceived emotional relationship was equal. As they were old, the communication level between couples was high, and the self-oriented perfectionism was low, their perceived position in sharing household chores was equal. On the other hand, as they were younger, the education level of their spouse was high, the reason for getting a job lay in supporting the family, and overtime hours worked, there was a higher level of role stress. 2) The influential variables which affect the life satisfaction, in order of importance, were communication level between couples, mother's role stress, age, non-financial reason of getting a job, and sharing household works. For relative contribution degree about life satisfaction, psychological variables among independent variables were revealed as the most influential ones. Thus, efficient communication between couples affected the life satisfaction to a great degree. Furthermore, the study proved that not only role stress variables but also perceived equity variables contributed to the life satisfaction.

Effects of Extract of Pueraria radix on Lipid Peroxidation in Ethanol-Administered Rats (갈근추출물이 에탄올을 투여한 흰쥐의 지질과산화에 미치는 영향)

  • 이정숙;김은실;김석환
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.28 no.4
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    • pp.901-906
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    • 1999
  • This study was designed to investigate the effect of Pueraria radix extract on lipid peroxidation in ethanol administered rats. Male sprague dawley rats were given 25% ethanol(2.5g per Kg body weight; E), 10% pueraria radix extract(CP), 25% ethanol and 10% pueraria radix extract(EP). The activity of hepatic superoxide dismutase was increased by ethanol and was lower in the EP group than in the E group. Hepatic catalase activity was increased by ethanol, but decreased by Pueraria radix extract. E group rats had significantly higher liver glutathione peroxidase activity. Activity of hepatic glutathione S transferase was higher in the CP group than in the other groups. No significant dif ferences was found in liver glutathione and lipid peroxide contents between control and EP group. These data indicate that the peroxidative damage associated with chronic ethanol consumption might be decreased by Pueraria radix extract.

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A Study using Structural Equations on how the Role Stress of Administrative Workers in General Hospitals Affects Burnout, Job Satisfaction, and Organizational Commitment Analysis (구조방정식을 이용한 종합병원 행정직원의 역할스트레스가 소진, 직무만족 및 조직몰입에 미치는 영향분석)

  • Lee, Jeong-Wook
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.622-628
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    • 2016
  • The aim of this study was to clarify how the role stress of administrative workers in medical institutions affects burnout, job satisfaction, and organizational commitment. The study conducted surveys on administrative workers at ten general hospitals with more than 200 beds for one month between July 13 and August 18, 2015. The surveys then underwent factor analysis, average variation extraction, a suitability index of the research model, and a path-coefficient estimation analysis of the research model using AMOS 18.0. The main results revealed a positive (+) effect according to the role conflict and role excess on burnout, and a negative (-) effect of burnout on job satisfaction, while they displayed no significant relationship with organizational commitment. These results suggest that clear guidelines and unity in instructions are needed to reduce the role of stress in cooperative tasks between departments and that optimizing the roles of organization members by accurately measuring and weighing tasks can increase the attachment to the organization and ultimately improve the individual job performance.

Agile-based Data Analysis Framework for Career Exploration in Library and Information Science (문헌정보학 전공의 진로탐색을 위한 애자일 기반 데이터 분석 프레임워크)

  • JeongYun Lee;HakLae Kim
    • Journal of the Korean Society for information Management
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    • v.41 no.1
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    • pp.189-210
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    • 2024
  • Individuals majoring in Library and Information Science (LIS) typically find employment in the library sector, such as working as librarians, university librarians, and in public libraries. Recent advancements in information technology and shifts in work outlooks have broadened the professional opportunities for students majoring in LIS in several sectors. Research on career exploration varies based on the university major or occupation. This paper suggests a methodology for conducting surveys and analyzing data efficiently to support ongoing career exploration for students majoring in LIS. It also examines the findings of a career exploration survey conducted among LIS majors. The survey findings indicate that individuals majoring in LIS are adapting their salary expectations and priorities in alignment with societal shifts, showing a preference for diverse career opportunities outside traditional librarian roles. Effective support and ongoing research are essential for the career development of LIS majors in this environment.

Modeling of the charge and discharge behavior of the 2S2P(2 series-2 parallel) AGM battery system for commercial vehicles (상용자동차용 직·병렬 AGM 배터리 시스템의 충·방전 거동 모델링)

  • Lee, Jeongbin;Kim, Ui Seong;Yi, Jae-Shin;Shin, Chee Burm
    • Journal of Energy Engineering
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    • v.21 no.4
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    • pp.346-355
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    • 2012
  • Recent in the world environmental issues and energy depletion problems have been received attention. One way to solve these problems is to use hybrid electric vehicles (HEVs). Therefore, the interest in HEV technology is higher than ever before. Viable candidates for the energy-storage systems in HEV applications may be absorbent glass mat (AGM) lead-acid, nickel-metal-hydride (Ni-MH) and rechargeable lithium batteries. The AGM battery has advantages in terms of relatively low cost, high charge efficiency, low self-discharge, low maintenance requirements and safety as compared to the other batteries. In order to implement HEV system in required more electric power commercial vehicles AGM batteries was connected to 2 series-2 parallels (2S2P). In this study, a one-dimensional modeling is carried-out to predict the behaviors of 2S2P AGM batteries system during charge and discharge. The model accounts for electrochemical reaction rates, charge conservation and mass transport. In order to validate the model, modeling results are compared with the experimentally measured data in various conditions.

Analysis of 11-nor-9-carboxy-Δ9-tetrahydrocannabinol in urine with certified reference material (인증표준물질(CRM)을 이용한 소변 중 대마 대사체 분석법 평가)

  • Ko, Beom-Jun;Kim, Jin-Young;Kim, Jong-Sang;Lee, Jeong-Jik;Cheong, Jae-Chul;Suh, Sung-Ill;In, Moon-Kyo
    • Analytical Science and Technology
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    • v.23 no.1
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    • pp.83-88
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    • 2010
  • For the evaluation of our laboratory's 11-nor-${\Delta}^9$-tetrahydrocannabinol-9-carboxylic acid (THCCOOH) urinalysis test, THCCOOH urinalysis test was carried out with Certified Reference Material (CRM). The used CRM was THCCOOH in freeze-dried urine produced by NIST as Standard Reference Material 1507b. Comparing the estimated value of our laboratory with CRM, the results was coincided in the confidence level of approximately 95%.

Uncertainty Evaluation of the Analysis of 11-Nor-9-carboxy-${\Delta}^9$-tetrahydrocannabinol in Human Urine by GC/MS (GC/MS를 이용한 소변 중 대마 대사체 분석의 측정불확도 평가)

  • Kim, Jin-Young;Jeong, Jae-Chul;Suh, Sung-Ill;Suh, Yong-Jun;Lee, Jeong-Jik;Kim, Jong-Sang;In, Moon-Kyo
    • YAKHAK HOEJI
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    • v.52 no.6
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    • pp.480-487
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    • 2008
  • We described an estimation of measurement uncertainty in quantitative analysis of 11-nor-9-carboxy-${\Delta}^9$-tetrahydrocannabinol (THCCOOH), the major metabolite of ${\Delta}^9$-tetrahydrocannabinol, in urine sample by solid-phase extraction (SPE) and GC/MS detection. The analytical results were compared and the different contributions to the uncertainty were evaluated. Inter-day and inter-person validation were performed using statistical analysis of several indicative factors. Measurement uncertainty associated with target analyte in real forensic samples was estimated using quality control (QC) data. Traceability of measurement was established through traceable standards, calibrated volumetric glassware and volume measuring device. The major factors of contribution to combined standard uncertainty, were calibration linearity, inter-day repeatability and inter-person reproducibility, while those associated with preparation of analytical standards and sampling volume were not so important considering the degree of contribution. Relative combined standard uncertainties associated with the described method was 12.05% for THCCOOH.