• Proceedings of the Korea Contents Association Conference
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• 2005.11a
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• pp.601-607
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• 2005

In this paper, we aggregate multi-links information between boundary nodes using the line segment scheme that aggregates topology information within PG referring bandwidth and delay parameter. To do this, we propose a modified line segment algorithm using two line segment method that represents two points which consist of delay-bandwidth pair to reduce topology information and provide a flexibility to the multiple-links aggregation. And we apply it to current star topology aggregation. Through the simulation result analysis, the proposed star topology aggregation scheme presents the better performance than existing scheme.

• Journal of KIISE:Databases
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• v.35 no.5
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• pp.391-399
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• 2008

RSS is the XML-based format for the syndication of web contents, and users aggregate RSS feeds with RSS feed aggregators. In order to effectively aggregate RSS feeds, an RSS aggregation policy is necessary. In this paper, we first propose an aggregation policy to minimize the number of postings being missed within an aggregation. Second, we analyze and compare our aggregation policy with existing aggregation policies. Our analysis reveals that our aggregation policy can reduce approximately 23% of the aggregation missing in comparison with the other aggregation policies while it increases only 6% of the aggregation delay.

• The Journal of the Korea Contents Association
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• v.8 no.7
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• pp.35-42
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• 2008

The proposed scheme in this paper can search multi-links efficiently using the depth priority method based on hop count instead of searching the all links. To do this, we proposed a modified line segment scheme using two line segment method. The scheme represents two points which consist of delay-bandwidth pair to reduce topology information and provide a flexibility to the multiple-links aggregation. And we apply it to current spanning tree topology aggregation. To evaluate performance of the proposed scheme, we compare/analyze the current method with the proposed scheme with respect to call success rate, access time and crankback rate. Simulation result analysis showed the proposed spanning tree topology aggregation scheme presents the better performance than existing scheme.

• The Journal of Korean Association of Computer Education
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• v.6 no.3
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• pp.75-85
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• 2003

This study develops the System(MetaGene) to create meta-data for learning object based on SCORM including meta-data of Assets. SCO, Contents Aggregation and metadata of Contents Package. API function cocle is embeded in Learning Object for interfacing API adopter in LMS to support SCORM and for tracking on learning process based on data models. Also, the learning objects are packaged the PIF(Packaged Interchange File) to transmit with LMS. MetaGene is verified by $SCORM^{(TM)}$ Conformance TestSuite for meta-data of learning objects, manifest file of Contents Packaging.

• Journal of Nutrition and Health
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• v.32 no.4
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• pp.384-393
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• 1999

The degree of platelet aggregation, thromboxane B2(TXB2)formation and fatty acid composition of platelet phospholipids(PL) were investigated in 24 healthy male subjects who for five weeks consumed either corn oil(CO) rich in linoleic acid(LA), perilla oil (PO) rich in $\alpha$-linoleic acid($\alpha$-LAN), or canola oil(CNO) rich in oleic acid(OA) as a major fat source. Total fat intake was 30% of total calories and prescribed oil intake of each dietary group was 50% of the total fat intake. In the CO group, significantly decreased contents of polyunsaturated fatty acids(PUFA), n-6 PUFA, n-3 PUFA and eicosapentanoic acid(EPA) were observed, and significantly increased contents of OA and saturated fatty acids(SFA) were observed in platelet PL after 3 weeks and 5 weeks of dietary treatment. In the PO group, contents of OA and docosahexanoic acid(DHA) were increased, and the ratio of n-6/n-3 was decreased significantly in platelet PL after dietary treatment. The CNO group showed significatnlty decreased contents of PUFA, P/S ratio, n-6 PUFA, LA,(EPA+DHA)/arachidonic acid(AA), and significantly increased SFA contents after 3 weeks of the oil-based diet. The dietary-induced effects on fatty acid composition of platelet PL were observed mostly after 3 weeks of the oil-based diet. The dietary-induced effects on fatty acid composition of platelet PL were observed mostly after 3 weeks. Plasma TXB2 levels were increased after 3 and 5 weeks of dietary treatment. However, only the CO and CNO groups showed significantly increased plasma TXB2 levles after 3 and 5 weeks of dietary treatment. However, only the CO and CNO groups showed significantly increased plasma TXB2 levels after 5 weeks of experimental diets, when compared with initial values. Degree of platelet aggregation increased only in the CO group after dietary treatment. As a result, at week 5 the degree of platelet aggregation of the CO group was significantly higher than those of the PO and CNO groups. Among the three oil-based diets, the PO-based diet seems to have beneficial effects on atherosclerosis by influencing plasma TXB2 levels and the degree of platelet aggregation, while the CO-based diet showed the most adverse effects. Our results imply that plasma TXB2 levels might be affected by dietary fatty acid composition.

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.411-414
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• 2006

Topology information can be aggregated in the network constructed hierarchically and aggregating topology information is known as TA(Topology Aggregation) and TA is very important for scalability in networks. It is a very important elements to extend networks and routing in networks. In paticular, routing and TA algorithm are much influence on networks performance in PNNI. Therefore, in this paper, we design and implement routing simulator for TA in PNNI.

• Proceedings of the Korea Contents Association Conference
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• 2005.05a
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• pp.396-400
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• 2005

In this paper, we propose an efficient full mesh topology aggregation method in PNNI networks. The proposed scheme can search multi-links efficiently using the depth priority method based on hop count instead of searching the all links. To evaluate performance of the proposed scheme, we compare/analyze the current method with the proposed scheme with respect to call success rate, access time and crankback rate. The result is that the proposed scheme is better than the current scheme in performance.

• The Journal of the Korea Contents Association
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• v.9 no.12
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• pp.515-527
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• 2009

IEEE 802.11n is an ongoing next-generation WLAN(Wireless Local Area Network) standard that supports a very high-speed connection with more than 100Mb/s data throughput measured at the MAC(Medium Access Control) layer. Study trends of IEEE 802.11n show two aspects, enhanced data throughput using aggregation among packets in MAC layer, and better data rates adapting MIMO(Multiple-Input Multiple-Output) in PHY(Physical) layer. But, the former doesn't consider wireless channel and the latter doesn't consider aggregation among packets for reality. Therefore, this paper analyzes data throughput for IEEE 802.11n considering MAC and PHY connection. A-MPDU(Aggregation-MAC Protocol Data Unit) and A-MSDU(Aggregation-MAC Service Unit) is adapted considering multi-service in MAC layer, WLAN MIMO TGn channel using SVD(Singular Value Decomposition) is adapted considering MIMO and wireless channel in PHY layer. Consequently, Simulation results shows throughput between A-MPDU and A-MSDU. Also, We use Ns-2(Network simulator-2) for reality.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.75-77
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• 2011

최근 수년간 방송과 통신의 융합이 지속적으로 진행되고 있으며, 특히 홈 네트워크를 통한 방송 및 통신의 멀티미디어 콘텐츠의 공유 기기 시장이 비약적으로 성장하고 있다. 스마트폰을 비롯한 스마트 기기의 진보를 통하여 사진, 음악, 영상의 멀티미디어 콘텐츠에 대한 공유가 홈 네트워크 상에서 이루어 지고 있으며, 이러한 기술은 업계 표준으로 사용되고 있는 UPnP 및 DLNA에 기반하고 있다. 다만, 이러한 홈 네트워크 표준은 Peer-to-peer 네트워크를 근간으로 하고 있어 홈 네트워크 내에 복수의 서버가 있을 경우 사용자의 편의성이 상대적으로 약하다. 이에 본 논문은 홈 네트워크 내에서 콘텐츠 리스트를 통합 관리할 수 있는 Contents List Aggregation 서비스를 제안한다. 제안되는 서비스는 홈 네트워크 내의 미디어 서버들로부터 Contents List를 전송받아 통합된 형태로 저장 및 관리할 수 있으며, 기존 서비스와 호환성을 유지할 수 있다. 서비스의 제안과 함께 서비스를 지원하는 UPnP Device 및 Control Point의 서비스 시나리오, 그리고 서비스 연동에 대한 운용환경 및 사용예가 함께 제시되었다.

• Natural Product Sciences
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• v.2 no.1
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• pp.37-42
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• 1996

Several species and varieties of Allium spp. grown in Indonesia were screened for their in vitro antiplatelet aggregation activities. The extracts were also analyzed by GC for their volatile sulfur-containing compounds, and measured for their Volatile Reducing Substances (VRS) contents. Antiplatelet aggregation potencies of Allium spp. were varied among the species and varieties studied. Garlic extracts showed the greatest ability to inhibit platelet aggregation followed by extract of shallot, chive, yellow onion, and green onion. The 'Jawi' and 'local Padang' variety of garlic showed high activities with $IC_{50}$ values of 9.1 and $9.8\;{\mu}g/ml$, respectively. The local Kupang variety of shallot showed the highest antiplatelet activity among the shallot varieties evaluated, with an $IC_{50}$ value of $111\;{\mu}g/ml$. Antiplatelet aggregation activities of Allium extracts showed a positive correlation with the level of volatile compounds.