• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1995년도 춘계공동학술대회논문집; 전남대학교; 28-29 Apr. 1995
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• pp.729-738
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• 1995

We consider a priority-based packet-switching system with three phases of the packet transmission time. Each packet belongs to one of several priority classes, and the packets of each class arrive at a switch in a Poison process. The switch transmits queued packets on a priority basis with three phases of preemption mechanism. Namely, the transmission time of each packet consists of a preemptive-repeat part for the header, a preemptive-resume part for the information field, and a nonpreemptive part for the trailer. By an exact analysis of the associated queueing model, we obtain the Laplace-Stieltjes transform of the distribution function for the delay, i.e., the time from arrival to transmission completion, of a packet for each class. We derive a set of equations that calculates the mean response time for each class recursively. Based on this result, we plot the numerical values of the mean response times for several parameter settings. The probability generating function and the mean for the number of packets of each class present in the system at an arbitrary time are also given.

• 융합정보논문지
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• 제8권5호
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• pp.183-188
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• 2018

본 논문은 미국의 사례를 통해 화이트칼라 구직활동에 영향력을 미치고 있는 커리어 자기계발 조언과 이의 문제점을 고찰한다. 먼저 빈번한 해고와 불안정한 고용의 확산으로 대변되는 미국 화이트칼라 노동시장의 변화와 이와 함께 부상한 자기계발 산업을 간단히 고찰한다. 다음으로 문헌연구를 통해 미국 화이트칼라 구직과정에서 접할 수 있는 대표적 자기 계발 조언을 살펴본다. 이는 정보통신기술의 발달이 구직과정에도 큰 영향을 미치는 점을 고려하여 이러한 기술의 활용을 포함하여 이력서와 네트워킹에 관한 조언을 중심으로 고찰한다. 마지막으로 커리어 자기계발 조언의 영향력에 비추어 이의 문제점들, 특히 개인의 부단한 노력만을 강조하며 이에 취업과 그 결과를 개인의 책임으로 돌리고 있음을 살펴한다.

• 방송공학회논문지
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• 제14권1호
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• pp.15-27
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• 2009

최근 다양한 휴대용 디지털 매체의 발전으로 시청자들의 멀티미디어 시청 환경이 공간적으로 확대되고 있다. 본 논문에서는 시청자가 VOD 서비스를 이용할 때 한 매체를 통해 시청하다가 이동을 위해 일시중지한 후 다른 매체를 통해 중지된 시점부터 다시 시청할 수 있는 VOD 시스템 제어구조를 제시한다. 그리고 이 제어를 위해 필요한 스트림 동기화 모듈과 시청 로그 기반의 세션 및 자원 관리 시스템을 제안한다. 특히, 시청자와 VOD 시스템간의 비디오 스트림 제어를 위한 세션별 VOD 서비스 연결 관리 시스템을 설계하고 시뮬레이션을 통해 VOD 서비스에서 Seamless 콘텐츠 연결 모델을 제시한다.

• BMB Reports
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• 제47권5호
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• pp.249-255
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• 2014

Polo-like kinase-1 (Plk1) belongs to a family of serine-threonine kinases and plays a critical role in mitotic progression. Plk1 involves in the initiation of mitosis, centrosome maturation, bipolar spindle formation, and cytokinesis, well-reported as traditional functions of Plk1. In this review, we discuss the role of Plk1 during DNA damage response beyond the functions in mitotsis. When DNA is damaged in cells under various stress conditions, the checkpoint mechanism is activated to allow cells to have enough time for repair. When damage is repaired, cells progress continuously their division, which is called checkpoint recovery. If damage is too severe to repair, cells undergo apoptotic pathway. If damage is not completely repaired, cells undergo a process called checkpoint adaptation, and resume cell division cycle with damaged DNA. Plk1 targets and regulates many key factors in the process of damage response, and we deal with these subjects in this review.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2000년도 추계학술대회 논문집(Proceeding of the KOSME 2000 Autumn Annual Meeting)
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• pp.99-107
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• 2000

With the results of calculation for natural frequencies, the forced reponses of coupled vibration of propulsion shafting were analysed by the modal analysis method. For the forced response analysis, axial exciting forces, axial damper/detuner, propeller exciting forces and damping coefficients were extensively investigated. As the conclusion of this study, some items are cleared as next. - The torsional amplitudes are not influenced by the radial excitation forces. - The axial vibrational amplitudes are influenced by the tangential exciting forces. An increase of amplitude is observed for the speed range in the neighbourhood of any torsional critical speed. - The coupling effect becomes larger if torsional and axial critical speed are closer together. - The axial exciting force of propeller is relatively strong, comparing with those of axial forces of cylinder gas pressure and oscillating inertia of reciprocating mechanism. Therefore, as a resume one can say, that- Torsional vibration calculation with the classical one dimension model is still valid. - The influence of torsional excitation at each crank upon the axial vibration is impotent, especially in the neighbourhood of a torsional critical speed. That means that the calculation of axial vibration with the classical one dimension model is insufficient in most of cases. - The torsional exciting torque of propeller can be neglected in most of cases. But, the axial exciting forces of propeller can not be neglected for calculating axial vibration of propulsion shafting.

• 천문학논총
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• 제27권5호
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• pp.431-438
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• 2012

A number of middle and high school students are selected at the Korea Astronomy Olympiad (KAO) in every year. In the first stage of the selection, the resume, school transcript, and recommendation letters from teachers are referred. In the second stage, after video lectures and weekend observation classes, students are tested with on-line homeworks, and interviewed through internet. For 118 students who have gone through the second stage of the 2012 KAO, we have conducted a questionnaire survey, which asks the students the motivation and preparation for the KAO. The survey has also included inquiries for the selection process and education program of the 2012 KAO; the replies will be used as feedbacks for the next year's KAO. The survey has revealed that the first stage worked well, while the second stage needs to be improved in terms of fairness and objectivity. We have found that most students received private tutorings for the KAO, so we suggest efforts should be made for students to be able to prepare the KAO without receiving private tutorings.

• 한국컴퓨터정보학회논문지
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• 제11권2호
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• pp.15-23
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• 2006

인터넷에는 많은 문서가 있고 지금도 새로운 문서가 만들어지고 있다. 따라서 인터넷에 존재하는 문서를 의미 있게 분류하는 것은 향후 문서의 관리 및 질의처리에서 중요한 문제이다. 하지만 지금까지 대부분은 키워드에 기초한 문서 분류방법을 사용하고 있다. 이 방법은 문서를 효율적으로 분류하지 못했다. 또한 의미를 포함한 문서의 분류를 하지 못한다. 사람이 문서를 꼼꼼하게 읽어서 문서를 분류하는 방법이 최선이지만, 시간적인 면이나 효율성에 문제가 있다. 따라서 본 논문에서는 신경망 알고리즘과 C4.5 알고리즘을 이용하여 문서를 분류하고자 한다. 실험 데이터로 XML로 만들어진 이력서 데이터를 사용하여 실험하였다. 실험결과 문서 분류에 가능성을 보였다. 또한, 다양한 문서 분류 응용에 적용하여 좋은 결과를 얻을 것으로 기대한다.

• 정신신체의학
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• 제5권1호
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• pp.129-134
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• 1997

The meddle years start when persons achieve maturity and end when they realize they are old, and we commonly call ages between thirty-live and sixty five the middle years. Thinking of life as a play, the middle years lead up to and away from the climax of the plot. In the early part of middle age, the man is the main support of his family, and is out to establish himself in his career. He is in a race toward success, and may acquire a sponsor who picks him out as a protege. In the middle part of middle age, the man is ready to come into his own and may break with his sponsor. Most persons are now at the height of their potential, know their areas of competence, and have the satisfaction of feeling in control in them. They need no longer prove themselves from day to day, for they are credited with past accomplishments. Some are caught in "promotion or success depression", and some continue to change jobs creating difficulties is readjustment. The more satisfactory changes usually occur within a career rather than through shifiting careers. In e later part of the middle age the man worries about his physical health, and experiences depression in facing the retirement. Woman frequently change the course of their lives some time between the ages of thirty-five and forty, and may resume their education or careers. Tee quarters of women are passing through "involutional melancholia".

• 약학회지
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• 제40권3호
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• pp.347-350
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• 1996

The post-antibiotic effect (PAE), which is defined as the period of time lag that the target organisms resume normal growth rate after complete removal of the antibiotics, of LB 20304 and ciprofloxacin was evaluated against Staphylococcus aureus 6538p and Escherichia coli 3190Y, respectively. The PAE was estimated by adding each antibiotic to a log phase of growth and incubating at $37^{\circ}$C for 1 h.Antibiotic was removed by centrifugation, and total viable cell counts were determined hourly for a further 10 h. The PAEs of LB20304 against S. aureus at concentrations of $1{\times}MIC\;and\;2{\mu}g/ml$ were 10 min and 93min, respectively. LB20304 showed a comparable PAE to ciprofloxacin. Against E. coli, the PAE of LB20304 was also similar to that of ciprofloxacin at concentration of $4{\times}MIC$ but it was much longer than that of ciprofloxacin at concentration of 2${\mu}g/ml$. LB20304 showed higher lethality than ciprofloxacin against both S. aureus and E. coli strains.

• Geomechanics and Engineering
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• 제9권6호
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• pp.689-707
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• 2015

Progressive increase in population causing land scarcity, which is forcing construction industry to build multistory buildings having underground basements. Normally, basements are constructed for parking facility. This research work evaluates important factors which have caused the collapse of pile-anchor system at under construction five star hotel. 21 m deep excavation is carried out, to have five basements, after installation of 600 mm diameter cast in-situ contiguous concrete piles at plot periphery. To retain piles and backfill, soil anchors are installed as pit excavation is proceeded. Before collapse, anchors are designed by federal highway administration procedure and four anchor rows are installed with three strands per anchor in first row and four in remaining. However, after collapse, system is modeled and analyzed in plaxis using mohr-coulomb method. It is investigated that in-appropriate evaluation of soil properties, additional surcharge loads, lesser number of strands per anchor, shorter grouted body length and shorter pile embedment depth caused large deformations to occur which governed the collapse of east side pile wall. To resume work, old anchors are assumed to be standing at one factor of safety and then system is analyzed using finite element approach. Finally, it is concluded to use four strands per anchor in first new row and five strands in remaining three with increase in grouted and un-grouted body lengths.