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Mobile IPv6 상에서 적응적 액티브 타이머를 고려한 IP 페이징
이보경(Bo-Kyung Lee) 한국정보과학회 2004 정보과학회논문지 : 정보통신 Vol.31 No.5
Mobile IP에서 이동노드의 불필요한 위치 등록으로 인하여 발생되는 네트워크 시그널링 오버헤드를 줄이고자 IETF에서는 IP 페이징 기법을 제안하였다. IP 페이징 기법을 지원하기 위하여 이동노드는 active on, active off, idle 중 한가지 상태를 유지하여야 한다. Active on 상태는 이동노드에 데이타 세션이 형성되어 데이타를 수신하거나 또는 송신하는 상태를 말한다. 이때 이동노드가 데이타의 송수신을 완료하고 나면 이동노드는 active off 상태로 바뀌게 되며 active timer를 구동한다. 그후 일정시간 동안 이동노드가 데이타를 송수신하지 않고 페이징 영역 간 이동이 발생하지 않으면 active timer가 만료된다. 이때 이동노드의 상태는 idle 상태로 바뀌게 된다. 기존의 IP 페이징 기법에서는 고정된 active timer 값을 사용하고 있으나 본 논문에서는 이동노드의 이동성 및 트래픽 특성에 따라 active timer 값을 동적으로 설정하여 불필요한 위치갱신 작업을 줄일 수 있는 IP 페이징 기법을 제안한다. 또한 본 논문의 제안기법과 기존의 IP 페이징 기법간의 위치 갱신 및 페이징 비용에 대한 수학적 모델을 수립하고 성능평가를 수행한다. 이를 이용하여 성능 분석을 수행한 결과 기존 기법에 비하여 제안 기법이 보다 효율적임을 보여주고 있다. Paging extensions for Mobile IP was proposed to avoid unnecessary registration signaling overhead of Mobile IP. In order to support the paging function in Mobile IP, the states of a mobile node are divided into active on, active off, idle. The active on state means when any incoming or outgoing data session arrives to a mobile node. After data session is completed, the state of the mobile node is changed into active off from active on. At this moment, the active timer starts to be operated. If the active timer expires, the mobile node moves to idle state. If a mobile node has very frequently data sessions at the same cell, the mobile node is better to move slowly into idle state. The other way, if the mobile node very frequently moves into new cell area and receives or sends little data, the mobile node is better to move earlier into idle state. In this paper, the active timer is adaptively set by the mobile nodes traffic and mobility characteristics and the paging scheme using this active timer is proposed to reduce the location registration cost.
이보경 ( Bo-kyung Lee ),한상찬 ( Sang-chan Han ) 한국고등직업교육학회 2001 한국고등직업교육학회논문집 Vol.2 No.2
This study was designed to investigate the status of opposite sex acquaintance in Y college female students. The time subjects had opposite sex feeling to male was elementary school(23.5%), middle school(29.7%), high school(26.2%), after graduation at high school(12.1%), college(3.9%), and the good time for opposite sex acquaintance regarded by subjects was elementary school (5.2%), middle school(12.4%), high school(40.9%), after graduation at high school(27.8%), college(11.2%), after graduation at college(0.9%), time to marry(1.1%). Percentage of the subjects experienced in opposite sex acquaintance was 80.7%, and the period of it was 1-3months(21.1%), 6moriths-lyear(12.5%), 1-3years(9.1%),more than 3years(8.5%). Forty-five percent of the subjects satisfied about opposite sex acquaintance, and fifty-eight point seven percent of the subjects answered that expense loader of opposite sex acquaintance was male friend. The earlier time to have opposite sex feeling to male, the earlier time to be regarded as good time for opposite sex acquaintance(p<0.001). And the more satisfaction degree of opposite sex acquaintance, the longer period of it(p<0.001). According to the period of opposite sex acquaintance, difficult aspects of it were different(p<0.001). In the case that male loaded the expense of opposite sex acquaintance, subjects’ satisfaction degree of it was more(p<0.001).
이보경 ( Bo-kyung Lee ),한상찬 ( Sang-chan Han ) 한국고등직업교육학회 2002 한국고등직업교육학회논문집 Vol.3 No.2
This study was designed to investigate the status of smoking in Y college female students. The percentage of smoking experience was 28.5%, and quantity of smoking was 1 ~2 cigarettes per month(9.4%), 1 ~2 cigarettes per week(6.3%), 5 cigarettes and less per day(17.5%), 6 ~10 cigarettes per day(19.6%), 11 ~20 cigarettes per day(9.9%), 21 cigarettes and more per day(3.4%). The beginning time of smoking was high school(38.1%),middle school(29.5%),college(18.8%),elementary school or before(5.7%). The place of smoking was the restroom of college(43.6%),cafe or bar(27.1%), home(6.4%), street or every else where(6.0%),billiard room or personal computer room(1.1%). The reason of smoking was habit(41.4%), dissolution of stress(17.7%), fashion or curiosity(7.1%). The percentage of the subjects who wanted to stop smoking was 75.9%. They wanted to stop smoking for health(71.8%), pregnancy and deli very (7.9%), skin(3.0%), and because of negative social consciousness about female's smoking(1.0%), parents' opposition to daughter's smoking(0.5%). The earlier time to begin smoking, the more quantity to smoke(p<0.001), and in the case of habitual smoking, the quantity of smoking was more(p<0.001).
코로나 비대면 시대 교양영어 수업 방식에 관한 학습자 인식 연구
이보경(Lee, Bo-Kyung) 한국교양교육학회 2021 교양교육연구 Vol.15 No.6
이 연구의 목적은 코로나 19 바이러스 감염증 대유행(COVID-19 Pandemic)이라는 비상 상황에 따라 시행한 온라인 교양영어 수업의 유형과 포스트 코로나 시대의 교양영어 수업 유형에 대한 학생들의 인식을 조사하는 것이다. 이를 위해 한 대학의 교양영어 수강생 301명을 대상으로 그들이 코로나 시기에 선호하는 온라인 수업 형태와 포스트 코로나 시대의 교양영어 수업 유형 가능성에 대한 인식을 설문 조사하였다. 선호하는 코로나 시대 온라인 수업의 유형은 전면 사전녹화, 녹화와 실시간 혼합, 전면 실시간 방식의 순이었고, 영어 학습 관심도나 전공 분야에 따라 인식의 차이가 존재하였다. 포스트 코로나 시대에 적용 가능한 강의 유형에 대한 긍정적 인식은 전면 대면, 온라인과 대면 혼합, 전면 온라인 순으로 나타났으며, 성별, 학년, 전공, 영어 학습 관심도에 따른 인식의 차이를 알 수 있었다. 본 연구는 단일 교수자의 복수 강좌 수강생들을 대상으로 한 사례 연구로 그 결과를 일반화할 수 없지만, 관련 논의는 장기화하는 팬데믹 위기 상황과 포스트 팬데믹 시대의 교양영어 프로그램 설계 및 운영을 위한 기초자료로 활용할 수 있을 것으로 기대한다. This study investigated 301 college students who attended mandatory online general English classes due to the COVID-19 pandemic for the purpose of examining their preferred online instruction type, as well as their perception regarding post-pandemic instruction type for general English. The order of the preferred online instruction is as follows: 1) fully pre-recorded videos, 2) blended classes, and 3) fully real-time videos. However, their preferences showed significant difference depending on their interest in English learning and their majors. With regard to the instruction type of post-pandemic general English, the order of the positive response is fully in-person instruction, blended classes, and fully on-line instruction, which also showed a significant difference depending on gender, year, major, and interest in English learning. Of course, since the data was gathered from a single instructor’s students, and thus are not generalizable, we might fairly expect that these results could be utilized as a basic reference point when it comes to the planning and designing of general English languages programs during and after the pandemic.
여대생의 체질량 지수, 허리둘레 및 운동 습관에 따른 식사다양성 평가
이보경 ( Bo Kyung Lee ),이종현 ( Jong Hyun Lee ) 한국식품영양학회 2010 韓國食品營養學會誌 Vol.23 No.4
The purpose of this study was to assess dietary variety by body mass index, waist circumference and exercise habits in 138 female university students residing in Bucheon and its adjacent area. Body mass index(BMI), waist circumference (WC) and exercise habits were assessed via a self reporting questionnaire, and a 3-day dietary recall survey was conducted by interviewing. Dietary variety was assessed by dietary diversity score(DDS), meal balance score(MBS), and dietary variety score(DVS). The average BMI, WC, DDS, MBS, and DVS were 20.7±2.59㎏/㎡, 69.3±5.03㎝, 3.87±0.57, 7.27±1.48, and 12.59±3.14, respectively. The DDS for breakfast, lunch, supper and snack were 1.80±0.92, 2.45±0.48, 2.49±0.55 and 0.53±0.52, respectively. DDS, MBS, and DVS were not significantly correlated with BMI, WC and exercise habits. However, DDS for breakfast and supper were significantly higher(p<0.05) and lower(p<0.05) respectivly in subjects who exercised regularly compared to those who did not exercise regularly. And DDS for snack was significantly higher in subjects whose awareness of health status was good or somewhat compared to those whose that was bad(p<0.05). These findings suggest that nutritional education based on female university students` eating variety and regular exercise may be required to improved dietary variety.