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公开(公告)号：KR101402932B1
公开(公告)日：2014-06-02
申请号：KR1020120144449
申请日：2012-12-12
Applicant: 서울대학교산학협력단
IPC: H04W72/08
CPC classification number: H04W74/0816
Abstract: According to the present invention, when packets of two stations collide in MU-MIMO networks, the two stations do not contend again for retransmission and enable the packets to be transmitted one by one immediately after detecting the collision. Also, concurrent transmissions are performed using RTS/CTS in distributed environments. In other words, if an RTS collision occurs between an MIMO and an SISO, an MIMO RX recovers all the overlapping two RTSs using zero forcing-successive interface cancellation (ZF-SIC). At this moment, channel estimation for ZF-SIC becomes difficult due to overlapping of preambles. However, the difficulty in the channel estimation can be solved by adding a postamble to the RTS of the SISO. By doing this, the MIMO RX can recognize the collision between the MIMO and the SISO. After that, the MIMO RX notifies each station of the occurrence of the collision through a CTX and the two stations having received the CTX transmit data one at a time. A transmission opportunity generated hereby assures secure transmissions of the MIMO and SISO like a TxOP. The RTS/CTS are used in channels estimation and synchronization of multiple stations as well, thereby facilitating easy concurrent transmissions.
Abstract translation: 根据本发明，当MU-MIMO网络中的两个站的数据包相互冲突时，两个站点再次不再进行重传，并且能够在检测到冲突之后立即一个一个地发送报文。 此外，在分布式环境中使用RTS / CTS执行并发传输。 换句话说，如果在MIMO和SISO之间发生RTS冲突，则MIMO RX使用零强制连续接口消除（ZF-SIC）来恢复所有重叠的两个RTS。 此时，由于前导码的重叠，ZF-SIC的信道估计变得困难。 然而，信道估计的困难可以通过在SISO的RTS中添加后同步码来解决。 通过这样做，MIMO RX可以识别MIMO与SISO之间的冲突。 之后，MIMO RX通过CTX向每个站通知冲突的发生，并且两个站一次接收到一个CTX发送数据。 所产生的传输机会确保如TxOP那样的MIMO和SISO的安全传输。 RTS / CTS也用于多个站的信道估计和同步，从而便于并发传输。
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公开(公告)号：KR1020140065235A
公开(公告)日：2014-05-29
申请号：KR1020120132510
申请日：2012-11-21
Applicant: 서울대학교산학협력단
IPC: G06F17/00
CPC classification number: H04L47/2441
Abstract: The present invention discloses a traffic classification apparatus and a method thereof. According to an aspect of the present invention, the traffic classification apparatus includes: a preprocessing unit which divides initial P bytes of a predetermined packet of each flow in a predetermined word units, and selects a word repeated for more than a predetermined number as input data; a topic modeling unit which extracts a topic of each flow using the input data using a latent dirichlet allocation (LDA) topic-modeling process, where the topic is an application program; a selection unit which extracts L number of words which have the highest distributions for each extracted topics in the input data; and a matching unit which directly matches the L number of extracted words onto the payloads for the respective flows and allocates one of the topics for each of the flows.
Abstract translation: 本发明公开了一种流量分类装置及其方法。 根据本发明的一个方面，所述流量分类装置包括：预处理单元，以预定字单位划分每个流的预定分组的初始P字节，并且选择重复多于预定数量的单词作为输入数据 ; 主题建模单元，其使用潜在Dirichlet分配（LDA）主题建模过程使用输入数据提取每个流的主题，其中该主题是应用程序; 选择单元，其针对输入数据中的每个提取的主题提取具有最高分布的L个单词; 以及匹配单元，其将L个提取的字直接匹配到相应流的有效载荷上，并为每个流分配一个主题。
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公开(公告)号：KR101326804B1
公开(公告)日：2013-11-11
申请号：KR1020120131149
申请日：2012-11-19
Applicant: 서울대학교산학협력단
CPC classification number: H04L63/1416 , H04L43/04 , H04L43/16 , H04L63/1458
Abstract: The present invention relates to a method and system for efficiently detecting DDoS by using a power law distribution. The method for detecting DDoS according to the present invention includes the steps of: collecting a flow for a monitoring period; calculating the collected flow value; and determining the DDoS based on the calculated value.
Abstract translation: 本发明涉及通过使用幂律分布来有效地检测DDoS的方法和系统。 根据本发明的用于检测DDoS的方法包括以下步骤：收集监视周期的流; 计算收集的流量值; 并根据计算值确定DDoS。
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公开(公告)号：KR101283565B1
公开(公告)日：2013-07-08
申请号：KR1020110134184
申请日：2011-12-14
Applicant: 서울대학교산학협력단
Abstract: 본 발명에서는 인터넷 웜의 전파 상황을 예측하는 SI 모델의 문제점을 극복하고, 웜의 전파 상황을 정확히 예측하기 위하여, 점유 문제(Occupancy Problem)를 사용하여 각각의 단계에서 다음 단계의 감염 예상율을 계산한다. 즉, 모든 발생가능한 경우의 수를 계산할 수 있는 점유 문제의 계산 방식을 적용하여 현 단계의 감염노드 수를 가지고 다음단계의 예상되는 신규 감염 노드수를 정확히 계산한다.
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公开(公告)号：KR1020120057349A
公开(公告)日：2012-06-05
申请号：KR1020100119038
申请日：2010-11-26
Applicant: 서울대학교산학협력단
IPC: H04L12/28
Abstract: In the wireless mesh network including a sender, a receiver, and a plurality of access points disposed between the sender and the receiver, available transmission paths between the sender and the receiver are determined; transmission expected values are calculated for the transmission paths; and a transmission path having a minimum transmission expected value is set as an actual transmission path. The transmission expected value is a sum of expected transmission counts, which is a reciprocal of multiplication of forward transmission success rate and backward transmission success rate of a communication link between the nodes disposed on the transmission paths. When an access point can transmit a packet concurrently with another access point, the expected transmitted count is reduced by half.
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Patent Agency Ranking
公开(公告)号：KR1020110136285A
公开(公告)日：2011-12-21
申请号：KR1020100056170
申请日：2010-06-14
Applicant: 서울대학교산학협력단
CPC classification number: H04W74/0816 , H04W72/082 , H04W84/12
Abstract: PURPOSE: An opportunistic concurrent transmission method of a wireless network is provided to efficiently use limited resources. CONSTITUTION: If one of an AP1(Access Point)(221) or an AP2(222) tries to transmit a packet, one AP acquires information of a link which transmits the packet from other AP. The AP checks the SINR(Signal to Interference plus Noise Ratio) value of the link with reference to an interference map. If the checked SINR value exceeds a predetermined capture threshold value, the AP simultaneously transmits the packet. A central control unit(210) is connected to the AP1 and the AP2.
Abstract translation: 目的：提供无线网络的机会性并发传输方法，以有效利用有限的资源。 规定：如果AP1（接入点）（221）或AP2（222）中的一个尝试发送分组，则一个AP获取从其他AP发送分组的链路的信息。 AP参考干扰图检查链路的SINR（信号干扰加噪声比）值。 如果所检查的SINR值超过预定捕获阈值，则AP同时发送分组。 中央控制单元（210）连接到AP1和AP2。
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公开(公告)号：KR100983049B1
公开(公告)日：2010-09-17
申请号：KR1020090117140
申请日：2009-11-30
Applicant: 서울대학교산학협력단
Abstract: PURPOSE: A dispersed AP(Access Point) selection method through the traffic recognition in radio environment using multiple transmission rate based on a beacon frame is provided to broadcast a beacon frame, thereby selecting AP which can be expected the highest treatment amount among a plurality of APs neighboring to a client. CONSTITUTION: An AP measures a retry field value of incoming packet transmitted from each client within a BBS(Basic Service Set)(S410). The AP measures a goodput during constant time. The AP uses the retry field value and the goodput to calculate throughput/client per client, and idle probability(S420). The AP transmits a frame including the retryratio, the treatment amount per client, and a frame including the idle probability to at least one client within a BBS(S430).
Abstract translation: 目的：提供一种通过基于信标帧的多个传输速率的无线电环境中的业务识别的分散AP（接入点）选择方法来广播信标帧，从而选择可以预期多个处理量中的最高处理量的AP 与客户端相邻的AP。 规定：AP测量从BBS（基本业务集）内的每个客户端发送的传入分组的重试字段值（S410）。 AP在恒定时间内测量一个好处。 AP使用重试字段值和吞吐量/客户端/客户端的空闲概率（S420）。 AP向BBS内的至少一个客户端发送包括重试次数，每个客户端的处理量和包括空闲概率的帧（S430）。
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公开(公告)号：KR100956642B1
公开(公告)日：2010-05-11
申请号：KR1020090107213
申请日：2009-11-06
Applicant: 서울대학교산학협력단
CPC classification number: Y02D70/00 , H04W40/02 , H04W52/0216 , H04W52/0222 , H04W74/0816 , H04W84/18
Abstract: PURPOSE: By putting in tune the necessary delay to decide the translation distance and receiving node of data packet data communications method and system of the duty cycle wireless sensor network select the most favorable node. CONSTITUTION: A source node having transmission data packet consecutively transmits a message a plurality of preambles shorting than the operational range of the receiving node. The receiving node receiving a message preamble transmits an acknowledge(ACK) to the source node. The source node receives a message ACK. Compensation is presently calculated of the case of transmitting data packet with the receiving node. The prediction compensation of the case of not transmitting data packet with the receiving node and waiting the other receiving node is calculated.
Abstract translation: 目的：通过调整必要的延迟来决定数据分组数据的转换距离和接收节点数据通信方式和系统的占空比无线传感器网络选择最有利的节点。 构成：具有发送数据分组的源节点连续地向消息发送与接收节点的操作范围短的多个前导码。 接收消息前导码的接收节点向源节点发送确认（ACK）。 源节点接收消息ACK。 当前计算与接收节点发送数据包的情况的补偿。 计算与接收节点不传输数据包并等待另一个接收节点的情况的预测补偿。
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公开(公告)号：KR101903058B1
公开(公告)日：2018-10-02
申请号：KR1020170041121
申请日：2017-03-30
Applicant: 서울대학교산학협력단 , 전북대학교산학협력단
IPC: H04L12/751 , H04L29/06 , H04L12/753
CPC classification number: H04W72/121 , H04W40/244 , H04W72/0446 , H04W72/1289 , H04L45/02 , H04L45/48 , H04L69/24
Abstract: 본발명의실시예에따른스케쥴링장치는, 싱크노드를기준으로랭크값이부여된노드들을연결한네트워크토폴로지를구성하는네트워크토폴로지구성부, 및싱크노드를기준으로획득되는랭크값에기초하여슬롯프레임으로부터구분된제 1 영역과제 2 영역에서상향링크와하향링크에서데이터전송을스케쥴링하는스케쥴링부를포함하고, 제 1 영역과제 2 영역은슬롯프레임내에서서로다른시간오프셋을갖는스케쥴링장치.
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公开(公告)号：KR101442123B1
公开(公告)日：2014-09-23
申请号：KR1020120153682
申请日：2012-12-26
Applicant: 서울대학교산학협력단
IPC: G06F21/55
Abstract: 본 발명은, 온라인상 아이템 추천 시스템에 있어서, 아이템 추천 정보를 조작하려는 시빌 공격자들에 의한 시빌 공격을 탐지하는 방법 및 장치에 관한 것으로서, 등급 정보의 분포에서의 고착성(Stickiness)과 영속성(Persistence)의 개념을 도입하여 탐지 구간에서 시빌 공격의 존부를 확인함으로써, 종래의 알고리즘에 비하여 정확도가 높은 시빌 공격 탐지 방법을 제공한다.
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