Limited area broadcast for warning message delivery over vehicular ad-hoc networks

Kang, Moonsoo,Virdaus, Irvanda Kurniadi,Shin, Seokjoo,Lee, Chung Ghiu Springer (Biomed Central Ltd.) 2016 Eurasip Journal on Wireless Communications and Net Vol.2016 No.-

<P>Vehicular ad hoc networks have been developed in consideration of advancing driving safety. In driving-safety applications, rapid dissemination of warning messages is highly demanded to avoid accidents involving incoming vehicles. Broadcast transmission is considered the most appropriate technique to spread warning messages because it can simultaneously reach all neighboring nodes within a transmission range using only a brief wireless media access. However, blindly broadcasting redundant messages may severely overcrowd wireless media channels and provoke transmission collisions; this is known as the broadcast storm problem. In order to reduce broadcast redundancy, broadcasting must be intelligently controlled. Simultaneously, an intelligent broadcast scheme should aim to reduce the number of hops needed to arrive at a destination, to achieve smaller propagation delay. In this paper, we observed the behavior of a few broadcast schemes and found that their performances can be explained as limiting a space to control the number of contentions in broadcasting. From the observation, we propose a limited area-based ( LAB) scheme to achieve a shorter propagation time as well as a smaller number of redundant broadcast messages. The proposed scheme can maintain a proper collision rate to obtain a faster propagation time by adjusting the size of an area in which broadcasting nodes belong. Performance evaluation results from simulation show that the proposed scheme is feasible and reasonable.</P>

A new loss recovery architecture for wireless TCP

Kang, Moonsoo,Mo, Jeonghoon,Kim, Seong-Lyun IEEE 2005 IEEE communications letters Vol.9 No.11

Implementation and evaluation of a new TCP loss recovery architecture

Kang, Moonsoo,Park, Hosung,Mo, Jeonghoon Springer (Biomed Central Ltd.) 2012 Eurasip Journal on Wireless Communications and Net Vol.2012 No.-

광무선통신기술을 이용한 차량간 메시지전달링크의 링크전송확률 분석

강문수(Moonsoo Kang),이충규(Chung Ghiu Lee) 한국멀티미디어학회 2011 멀티미디어학회논문지 Vol.14 No.6

산란계 감염 살모넬라균 억제에 대한 감귤박 특이 발효 미생물 제제의 사료 첨가 효과

TaeYoon Kang(강태윤),SyungTae Kang(강승태),YoungHo Ihn(인용호),YangHo Lee(이양호),DonYoung Cho(조돈영),Sung-Jin Lee(이성진),WonGeun Son(손원근),MoonSoo Heo(허문수),DongKee Jeong(정동기) 한국생명과학회 2010 생명과학회지 Vol.20 No.2

안전한 먹거리 생산은 축산물의 사육에서부터 시작된다. 현재 병원성 바이러스 및 균에 의해 먹거리의 안전성이 위협을 받고 있으며, 또한 항생제의 남용으로 인하여 병원성 균이 면역력을 갖게 되고 그에 따라 슈퍼 박테리아 등이 계속 생겨나고 있는 추세이다. 이런 시점에 항생제 대체 물질 개발이 절실하게 요구되고 있다. 이에 본 연구는 안전한 축산물생산과 국민의 식품안전의 최초단계인 축산업에서 항생제를 대체할 천연항생 사료첨가제를 개발하고자 본 실험을 실시하였다. 본 연구에서는 감귤박 특이 균주, 토양미생물 균주, Coenzyme Q10을 이용하였고, 무 항생제사료에 첨가하였다. 병아리 때 일정 기간 동안 사료첨가제를 급여 후 살모넬라균(Salmonella gallinarium)을 구강을 통해 주입하였다. 그리고 일정시간 동안 혈액과 분변을 채취하고 배지를 이용 살모넬라균 검사를 실시하였으며, 결과적으로 감귤박 특이 균주에서 가장 좋은 억제 효과를 얻었다. 이 결과를 살펴볼 때 병아리에서는 이러한 첨가제들이 장내 다른 병원성 균이 선점하지 못하도록 하는 것으로 사료된다. 장기의 해부를 통해서 장기의 손상 상태를 확인한 결과 감귤박 특이 균주 첨가제인 경우 간장색의 선홍색인 반면 일반 항생제 및 무 항생제 사료는 간장의 색의 황색으로 변한 것으로 미뤄 보아서 첨가제의 효과로 살모넬라균이 억제되어 간장의 손상을 방지한다는 효과를 얻었다. 이러한 결과는 천연항생제를 이용한 사육 기반 확립은 물론 먹거리 안전성을 보장하며, 사육부산물은 식물재배의 비료로 이용하여 완전 순환농업을 위한 좋은 재료가 될 수 있을 것으로 사료된다. Nowadays many people use antibiotics to protect processed foods from many pathogenic bacteria. The abuse of antibiotics, however, can run the risk of creating resistant forms of bacterium. Our study focus is on making new substances that can not only replace antibiotics but also be friendly to the environment. In our experiments, we used fermented citrus fruit, soil microbes and coenzyme Q10 as probiotics and prebiotics. Chickens in the experimental group were fed these substances via oral route while those in the control group were not. After specific time periods, blood and feces samples were collected to test for Salmonella spp.. It is interesting that fermented citrus fruit was the most effective in suppressing this bacterium. Furthermore, dissection of the experiment group chickens shows that their livers did not change to a yellow color, in contrast to the control group. The results confirmed our proposal that the chickens fed with these materials can be protected from infection by Salmonella and other pathogens. These probiotics and prebiotics are highly practical because they are natural substances that can be easily recycled in the environment. It can also be used as an animal feed ingredient because of its safety.

무선 TCP 성능증대를 위한 향상된 대역폭 측정 방법

강문수 ( Moonsoo Kang ),신석주 ( Seokjoo Shin ) 한국인터넷정보학회 2008 인터넷정보학회논문지 Vol.9 No.6

무선망에서 TCP의 성능을 증대시키기 위한 많은 연구가 진행되어 왔지만 패킷 손실률이 큰 경우, TCP의 성능은 아직도 개선의 여지가 많다. 본 논문은 무선 TCP의 한 종류인 TCP Westwood에서 랜덤 패킷 손실률이 높을 때 성능이 저하되는 문제를 지적하고 그 원인을 분석하였다. TCP Westwood의 성능 저하는 랜덤 패킷 손실률이 증가할수록, TCP Westwood의 가용 대역폭 측정(Available Bandwidth Estimation)의 정확도가 떨어지기 때문이다. 분석된 원인을 바탕으로 2가지의 향상된 가용대역폭 측정방법을 제안하고 그 성능을 시뮬레이션을 통해 확인하였다. 제안된 방법들은 무선 네트워크가 겪을 수 있는 랜덤 패킷 손실률 1% 이내에서 기존방법에 비해 대역폭 측정의 정확도가 향상되었다. Even though a lot of researches to improve the performance of TCP over wireless networks have been performed, the performance of TCP cannot satisfy users under high packet loss rate of wireless networks. This paper addresses the problem of TCP Westwood under high packet loss rate and reveals the reasons through the extensive simulation analysis. The ABE(Available Bandwidth Estimation) of TCP westwood becomes incorrect due to TCP dynamics of loss recovery. Based on this observation, we propose two algorithms for enhancing the correctness of ABE. We have evaluated the effects of the proposed algorithms through simulation. The proposed algorithms have achieved more correct ABE under the packet loss rate less than 1%.

무선 네트워크에 적합한 Decoupled TCP

강문수(Moonsoo Kang),모정훈(Jeonghoon Mo) 한국정보과학회 2004 한국정보과학회 학술발표논문집 Vol.31 No.2Ⅲ

무선망에서의 TCP 성능은 많은 연구가 되어 왔지만 손실율이 큰 경우의 TCP의 성능은 아직도 개선의 여지가 많다. 본 논문은 두 가지 정에서 새로운 TCP를 제안한다. 첫째, 혼잡제어(Congestion Control)와 손실제어(Loss Recovery)가 분리(Decoupled)되었다. 기존의 연구들은 무선손실과 혼잡손실을 구분하여야 한다는 점에는 많은 연구를 해왔지만 무선 손실에 대하여 어떻게 대처할 것 인기에 관한 문제는 상대적으로 간과하였다. 둘째, 기종의 TCP-Westwood와 TCP-Jersey에서 사용되는 ABE(Available Bandwidth Estimation)가 무선네트워크에 의해 발생하는 패킷 손실로 인해 부정확해지는 것을 지적하고 새로운 ABE방법을 제시한다. 시뮬레이션을 통하여 우수한 성능을 보여주었다.

The Relationship between Type D Personality and Heart Rate Variability in Community Mental Health Center Users

Noeul Kang,JeungSuk Lim,TaikGun Hwang,SookHaeng Joe,MoonSoo Lee 대한신경정신의학회 2015 PSYCHIATRY INVESTIGATION Vol.12 No.2

Objective-Type D personality can be regarded as a promising cardiovascular risk marker that has been repeatedly linked to relevant indicators of mental health, quality of life, morbidity, and mortality in cardiac patients. Heart rate variability (HRV) is a non-invasive technology that can provide information regarding a patient’s sympathetic/parasympathetic balance and the control mechanisms of the autonomic systems in the cardiovascular system. As both type D personality and HRV are parameters related to the cardiovascular system, we assumed a relationship between type D personality and HRV. This study set out to identify the relationship between type D and HRV and the differences in HRV variables between type D and non-type D personalities. Methods-Patients who visited Guro Community Mental Health Center from January 2011 to December 2012 were surveyed. They were evaluated using both the Korean version of the Type D Personality-14 for type D personality and HRV. During the survey, those who reported major cardiovascular disease that can affect heart rate variability were excluded from the study. Results-Our analysis included 559 participants, 249 of whom were classified as type D personality. No significant differences were found in the HRV variables between the type D group and the non-type D group. There were also no clinically meaningful correlations between HRV variables and type D total/subscale scores when controlled for patient age. Conclusion-A relationship between HRV and type D personality was not identified using short-term HRV measurements in non-clinical patients with no definitive cardiovascular disease. Further studies using long-term HRV measurements in patients with cardiovascular disease are necessary to conclude an association between HRV and type D personality.

신규통신망 공통비용의 대안적 배부 기준

김문수(MoonSoo Kim),강선아(SunA Kang) 한국통신학회 2003 한국통신학회 학술대회논문집 Vol.2003 No.11

TTS를 이용한 매장 음악 방송 서비스 시스템 구현

장문수(Moonsoo Chang),강선미(Sunmee Kang) 한국음성학회 2007 음성과학 Vol.14 No.4

This thesis describes the development of a service system for small-sized shops which support not only music broadcasting, but editing and generating voice announcement using the TTS(Text-To-Speech) technology. The system has been developed based on web environments with an easy access whenever and wherever it is needed. The system is able to control the sound using silverlight media player based on the ASP .NET 2.0 technology without any additional application software. Use of the Ajax control allows for multiple users to get the maximum load when needed. TTS is built in the server side so that the service can be provided without user's computer. Due to convenience and usefulness of the system, the business sector can provide better service to many shops. Further additional functions such as statistical analysis will undoubtedly help shop management provide desirable services.