• Journal of Korea Multimedia Society
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• v.12 no.11
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• pp.1521-1529
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• 2009

There is a serious unfairness problem between upstream and downstream flows of AP in IEEE 802.11 Wireless LAN. This problem is because Wireless LAN's DCF MAC protocol provides AP with equal channel access priority to mobile noded. Also, it makes this problem worse that the TCP's Data segment loss is more effective on throughput than the TCP's ACK segment. In this paper, we first make several simulations to analysis the unfairness in the various point of view and to find reasons of the unfairness. Also, this paper presents AP's scheduling scheme to alleviate the unfairness problem and evaluate the scheme through ns2 simulator.

• The Korea Journal of Herbology
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• v.22 no.1
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• pp.1-6
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• 2007

Objectives : The purpose of this study is that the protective effects of habmayou on acetaminophen (AP)-induced hepatotoxicity were investigated in mice. Methods : Before administering AP mice supplied with only water were left alone for 18 hours. after concentration and dissolution in poly ethylglycol AP 400mg per 1kg of mouse weight, we injected AP titrated density with a physiological saline solution into the abdominal cavity of mouse to induce hepatotoxicity. we researched mortality rate and the shape of liver tissue of mouse. Results : Treatment with habmayou (250 mg/kg, p.o.) 0.5 h after AP administration significantly prevented an increase in plasma alanine aminotransferase and aspartate aminotransferase activities and AP-induced hepatic necrosis, and also reduced AP-induced mortality from 46% to 0%. In addition, oral treatment with habmayou significantly prevented AP-induced depletion of glutathione (GSH) contents. However, habmayou treatment, by itself, did not affect hepatic GSH contents. Conclusion : These results show that the hepatoprotective effects of habmayou against AP overdose may be due to its ability to block the bioactivation of AP by regeneration of hepatonecrotic cells.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.507-509
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• 2010

To manage a sensing information such as temperature, humidity efficiently, it's highly recommended suitable application protocol. In this reasons, IETF WG proposed a CoAP protocol, and it's on Internet draft. If it is possible to work on a specific protocol, sensor end nodes and network devices will be managed efficiently. However, end nodes have constrained resources, it is hard to apply a CoAP protocol. In this paper, we analyse a CoAP protocol for USN, and propose a applying method for CoAP over USN nodes.

• Korean journal of applied entomology
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• v.34 no.2
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• pp.95-99
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• 1995

Acid phosphatase(AP) of he aphid, Megoura crassicauda and the major component of the lady beetle's artificial diet, fresh chicken liver, was adapted as a model protein to study the digestion of diet proteins in the midgut of Harmonia axyridis. The lady beetle did not secrete its own AP into the lumen of the midgut. The aphid and the live chicken liver had AP which was still alive in enzymatic activity from the extract of the lumen of the midgut of the lady beetle. The digestive ability of the lady beetle on proteins turned out to be different depending on food sources. In the lumen of the midgut of the lady beetle, though most of AP of live chicken liver lost its activity withtin 12 hours, that of M. cassicauda kept strong enzymatic activity up to 24 hours.

• Journal of the Korean Society of Radiology
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• v.5 no.6
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• pp.377-381
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• 2011

The purpose of this study is an assessment between the measured value of the nanoDot dosimeter and the calculated value of Non Dosimeter Dosimetry-Method(NDD-M) for entrance surface dose in general radiography. Measurement and calculation of the entrance surface doses were performed for head(AP), abdomen(AP), pelvis(AP), thoracic spine(AP) and lumbar spine(AP). As a result, the relative ratios of the measured value to the calculated value were acquired 1.5-2.1 for each region. Reproducibility acquired 0.035 as a coefficient of variation.

• Korean Journal of Computational Design and Engineering
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• v.13 no.5
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• pp.342-351
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• 2008

ISO 10303-AP241 is an Application Protocol of ISO 10303, which specifies the representation of AEC facility's life cycle information. The Working Draft of AP241 was submitted to the TC184/SC4 of ISO in July, 2007 by Korean team of ISO TC184/SC4/WG3. This paper introduces the currently developed draft Ap241 core model, and describes the life cycle support modules which are required to represent the life cycle information of AEC facilities. The draft core model is developed as a generic data model which is useful as a basis for implementation in a data warehouse. This core model could be used in combination with reference data such as PLCS RDL, Gellish table and RDL of ISO 15926. These concepts already exists in ISO 10303-AP221, AP239 and ISO 15926. In order to support maintenance and feedback of operational information concerning the AEC facilities, the AP241 team re-used many modules from AP239, and developed various STEP Application Modules which are adapted from the ISO 15926.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.203-204
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• 2015

하나의 AP에 다수의 사용자가 연결되어 AP의 부하가 가중될 경우 해당 AP에 연결되어 있는 사용자들의 무선데이터 전송속도는 현저하게 떨어진다. 이를 방지하기 위해 본 논문에서는 SDN 기술을 사용하여 SDN 제어기에서 연결된 AP들의 부하분산을 지원하는 시스템을 제안하였으며, 해당 시스템은 SDN 제어기와 AP 그리고 안드로이드 스마트폰으로 구성되었다. 본 논문에서 제안하는 시스템을 지원하기 위해 각각의 AP들은 SDN 제어기와의 통신을 담당하는 SDN Agent를 설치한다. 또한 현재 이동통신단말기가 연결이 가능한 AP들의 목록을 작성하기 위해 이동통신 단말기에도 SDN Agent를 설치한다. SDN 제어기는 각각의 Agent로부터 받은 정보들을 통해 적합한 AP로 이동통신 단말기가 다시 연결될 수 있도록 한다. 본 논문에서는 제안한 시스템의 검증을 위해 실험환경을 구성하여 실험을 수행하였으며 효과적으로 동작하는 것을 확인하였다.

• Journal of the Chungcheong Mathematical Society
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• v.20 no.4
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• pp.543-550
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• 2007

In this paper, we define the ap-Denjoy integral and investigate some properties od the ap-Denjoy integral. In particular, we show that a function f : [a,b]${\rightarrow}\mathbb{R}$ is ap-Denjoy integrable on [a,b] if and only if there exists an $ACG_s$ function F on [a,b] such that $F^{\prime}_{ap}=f$ almost everywhere on [a,b].

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.1255-1258
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• 2006

무선 단말기를 이용하여 무선 인터넷을 사용하는 경우 이동성으로 인해 사용자가 특정 AP에 집중하여 과부하가 발생할 수 있다. 본 논문에서는 사용자에게 최적의 AP 위치를 알려주어 사용자의 이동을 유도함으로써 AP의 과부하를 방지하고, 보다 높은 네트워크 대역폭을 확보할 수 있게 하는 최적 AP 자동 접속 시스템의 구현 내용을 기술한다.

• Journal of the Chungcheong Mathematical Society
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• v.21 no.1
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• pp.79-89
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• 2008

In this paper, we define the ap-Henstock integral and the ap-Denjoy integral of Banach-valued functions, and we investigate some properties of these two integrals. In particular, we show that the ap-Henstock integral is equivalent to the ap-Denjoy integral.