NEMO에서의 이동 시나리오 분류 및 빠른 핸드오버 성능 분석

최승준,수동,유상조,Choi, Seung-Joon,Su, Dong,Yoo, Sang-Jo 한국통신학회 2006 韓國通信學會論文誌 Vol.31 No.11B

본 논문에서는 NEMO 환경에서 핸드오버를 통해 발생할 수 있는 이동 시나리오의 정의와 핸드오버 실패시의 지연 및 패킷 손실과 전송비용의 분석을 목적으로 한다. 이를 위해 네트워크 노드의 이동성을 지원하며 핸드오버 절차의 성능향상을 위한 메커니즘 중 하나인 빠른 핸드오버 (FMIPv6)와 계층적 이동 IPv6 구조 (HMIPv6)가 NEMO와 결합했을 때 발생할 수 있는 네트워크 개체의 다양한 이동 시나리오를 분류하고, 각 시나리오에서의 핸드오버 실패의 경우를, 빠른 핸드오버 절차에 기반한 시점을 기준으로 정의하였으며 이동 네트워크 개체의 핸드오버가 실패했을 경우 절차를 완료하는데 필요한 지연 및 그 시간 동안의 패킷 손실과 전송비용 측면에서 분석했다. In NEMO scenarios, mobile node's variety of movements and mobile router's point of attachment changes can result in handover. This handover process needs additional time to finish due to the multiple levels of indirection involved in NEMO. And the performance issues of mobile node's handover such as handover delay and packet loss in above cases haven't been studied thoroughly. So, in this paper, we define fast handover failure cases in hierarchical mobile IPv6 network based NEMO. We briefly described NEMO architecture and handover procedures of FMIPv6 and HMIPv6. And then, we classified mobile node or mobile router's movement pattern into several scenarios. Analysis for the fast handover classified NEMO scenarios, in terms of handover latency and packet delivery cost have been performed.

건축 기초 공사를 위한 3차원 지형 생성 시스템 개발

최승준(Seung-Joon Choi),조기용(Ki-Yong Cho),권기연(Ki-Youn Kwon) (사)한국CDE학회 2017 한국CDE학회 논문집 Vol.22 No.4

The development of an intelligent excavator is actively proceeding with the development of ICT technologies. This can increase efficiency by minimizing the role of the operator and automating many tasks. In this process, a 3D geological model corresponding to the actual working area is indispensable. The 3D model is used for excavation working instruction and monitoring. We propose a method for efficiently reconstructing a 3D geological model from a 2D drawing for building foundation work. This model is composed of triangular elements for visualization. The previous manual restoration process is automated using the text and geometric information of the drawings. This developed system was tested on a real model to demonstrate its feasibility.

재전송 노드의 선택에 의한 효율적인 Flooding 알고리즘

최승준 ( Seung-joon Choi ),유상조 ( Sang-jo Yoo ) 한국정보처리학회 2007 한국정보처리학회 학술대회논문집 Vol.14 No.1

본 논문에서는 Ad-hoc 네트워크에서 패킷 flooding에 의해 발생하게 되는 broadcast storm problem[1]을 해결하기 위한 크로스 레이어 기반의 flooding 기법을 제안한다. 제안된 flooding 기법은 크로스 레이어 프로토콜을 기반으로 하여 물리계층과 MAC (Medium Access Control) 계층에서 이웃 노드들에 대한 정보를 수집하고, 이를 이용하여 효율적인 재전송 노드의 수를 결정한다. 모의 실험을 통한 성능평가에서는 전체 네트워크 노드에 대한 수신 비율이 simple flooding 에 근접하며, 전송 비율 및 평균중복패킷 수에서도 좋은 성능을 보임으로서 broadcast storm problem을 해결할 수 있다.

이동성 기반 네트워크에서의 빠른 핸드오버 메커니즘 분석

최승준(Seung-Joon Choi),수동(Dong Su),유상조(Sang-Jo Yoo) 한국통신학회 2006 한국통신학회 학술대회논문집 Vol.2006 No.7

“팀파니”(THE TIMPANI)

崔承俊 ( Seung-joon Choi ) 漢陽大學校 音樂硏究所 1987 音樂論壇 Vol.3 No.-

The appearance of bowl-shaped drums was a long time ago. As with many other percussion instruments, it's origin was Middle-East area and original use was for military. Small timpani, called nakers, were used for dance music, accompaniment of song and some church music in the 13th to the end to the 14th century. Large timpani began to be used in Europe during the 15th century. In this time, the drums used with trumpets ensemble mostly in the cavalry. The timpani, entered orchestra about 17th century, played same rhythm with brass or full orchestra at first time, but gradually had a short individual solo passages and dynamic contrasts. In this period, the drums used in a pair, tuning was always C and G. There were never changed the tuning throughout the entire work. In the Baroque period, the timpani had a fixed member in the orchestra and the roll began to be used in this time. Music developed chromatically, many composers required three or more drums and new tuning. Also playing skills developed variously and the instrument were improved to quick-tuning. The timpani were used not only rhythmically and dynamically, but melodically, harmonically and various tone color contrasts in contemporary music. Also, man solo works for timpani appeared in these days.

무선 센서 네트워크에서의 적응적 재전송 노드 선택에 의한 효율적인 Flooding 알고리즘

최승준(Seung Joon Choi),유상조(Sang-Jo Yoo) 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.11B

본 논문에서는 무선 센서 네트워크에서 노드의 simple flooding에 의해 발생되는 broadcast storm problem을 해결하기 위한 크로스 레이어 기반의 효율적인 flooding 기법인 FARNS (Flooding algorithm with Adaptive Retransmission Nodes Selection)를 제안한다. FARNS는 MAC과 PHY에서 각각 이웃노들의 식별 정보와 수신신호강도 정보를 수집하여 패킷의 재전송에 사용될 재전송 후보 노드를 선택하여 모든 노드가 수신 패킷의 재전송을 시도하여 발생하는 불필요한 에너지의 낭비를 방지한다. 성능평가를 위한 모의 실험에서는 패킷의 수신비율과 전송비율, 평균중복패킷의 수와 오버헤드 등의 평가기준에서 FARNS가 다른 flooding 기법들보다 우수한 성능을 보인다. 또한, 재전송 동작에서 사용되는 노드들의 비율을 조절함으로써 다양한 네트워크 환경에서의 요구사항을 만족시키는 동시에 broadcast storm problem을 해결한다. In this paper, we introduce an FARNS (Flooding algorithm with Adaptive Retransmission Nodes Selection). It is an efficient cross layer-based flooding technique to solve broadcast storm problem that is produced by simple flooding of nodes in wireless sensor network. FARNS can decrease waste of unnecessary energy by preventing retransmission action of whole network node by deciding retransmission candidate nodes that are selected by identification in MAC and distance with neighborhood node through received signal strength information in PHY. In simulation part, we show the results that FARNS has excellent performance than the other flooding schemes in terms of broadcast forwarding ratio, broadcast delivery ratio, number of redundancy packets and overhead. And FARNS can adjust of node ratio for retransmission operation, it can solve broadcast storm problem as well as meet the requirements of various network environments.

스네어드럼과 관련된 타악기에 관한 연구

최승준(Seung Joon Choi) 민족음악학회 2002 음악과 민족 Vol.23 No.-

The appearance of snare drum-like instrument in Europe was about 13th century, as the same age of first looked drum, ancestor of timpani, called nakers. Before the this century, there is no evidences of using snare drums and nakers in Europe, supposed the two types of drum introduced from orient, Middle-East area, during the Crusade War. Nakers, gradually increased the size like modern timpani, were used with trumpets ensemble mostly in the cavalry. In 17th century, timpani were joined to the orchestra as a regular instrument. Sanre drum were used importantly in the army, navy, drum corps and marching band with fife or flute ensemble that originated from, one player playing pipe and drum, called `tabor and pipe`. In the 19th century, snare drum were gradually used in many orchestral musics. Many of 20th century composers, were concerned about the unique timbers of snare drum, used this instruments in theirs musics with various sounds and new performance techniques. In these times, the drum also used importantly at the drum-set ad modern chamber musics as a solo instrument. Tenor drum were used in orchestra, marching band and drum corps, size and sound as a middle drum between snare and bass drum. Field drum is larger than snare drum, often called parade drum, a brother of snare drum, were used in marching band and drum corps, instead of snare drum. Tabor, long shaped. origin of Provence France, were used in orchestral music by some of French composers in the early 20th century. But in these days, many composes and players, except folk musicians, does not use this drum. Tom-toms used frequently in various jenre of music, popular music, percussion ensemble, marching band, drum corps, since two different size drums joined at the drum-set in about 1930. Especially, this drum has a good advantage, can tuning as like timpani. using many drums in various sizes and pitches. The new-type instruments were called Roto-toms, Rock-toms and Timp-toms.

관절경을 이용한 반월상연골 낭종의 치료

민병현,이원익,최승준,강신영,Min, Byoung-Hyun,Lee, Weon Ik,Choi, Seung Joon,Kang, Shin Young 대한관절경학회 1998 대한관절경학회지 Vol.2 No.2

Recent studies suggest that most meniscal cysts can be treated surgically by arthroscopic management of the meniscal tear and arthroscopic cyst evacuation. But arthroscopic cyst decompression may sacrifice a substantial amount of meniscal tissue that is not torn in order to expose the "stalk" of the cyst. Nowadays, the trend is changing as preserving the involved meniscus to prevent from inevitable degenerative changes after meniscectomy. The purpose of this report is to describe a new surgical technique that minimizes loss of meniscal tissue in hopes of maximizing residual meniscal function. We experienced 10 patients with meniscal cysts that were consisted of four lateral cysts and six medial cysts. Menisci were torn in all cases. Arthroscopic partial meniscectomy and decompression of cysts were performed in 9 cases, and arthroscopic partial meniscectomy and open cystectomy in 1 case. The procedures were consisted of injection of the methylene blue into the cyst, partial meniscectomy of the meniscal tear until the dye was seen in orifice of the cyst, and decompression of cyst through cystic opening. This article serves to confirm the relationship between torn menisci and cysts, to re-evaluate the occurrence ratio of the meniscal cyst on the medial to lateral meniscus, and to assess the efficacy of arthroscopic partial meniscectomy and decompression of cyst as a potentially meniscal sparing procedure.

ERT를 이용한 전력설비용 대지모델 영상복원

부창진(Chang-Jin Boo),최승준(Seung-Joon Choi),정광자(Kwang-Ja Jeong),고봉운(Bong-Woon Ko) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

The accurate measurement of soil resistivity and earthing system resistance is fundamental to electrical safety. However, geological and meterological factors can have a considerable effect on the accuracy of conventional measurements and the validity of the measurement methods. This paper presents optimization method of dc resistivity data acquisition system using ERT.

이 달의 영상 : 간담도기 자기공명영상에서 중심부 저신호강도로 보이는 국소결절과증식

심영섭 ( Young Sup Shim ),최승준 ( Seung Joon Choi ) 대한소화기학회 2015 대한소화기학회지 Vol.65 No.3