실시간 운영체제 VxWorks 상에서 통신 미들웨어 TAO의 실시간성 지원에 대한 연구

임재석(Lim jae-seok),손재열(Son jae-yeol),이용태(Lee yong-tae),이철훈(Lee cheol-hoon) 한국콘텐츠학회 2009 한국콘텐츠학회 종합학술대회 논문집 Vol.7 No.1

분산 환경에서 이기종 시스템 간의 독립적이고 표준화된 환경을 지원하기 위해 RT-CORBA(Real-Time Common Object Request Broker Architecture) 기반의 오픈소스 TAO(The ACE ORB) 통신 미들웨어에 대한 연구가 활발해지고 있다. 실시간성 측면에서 TAO는 Windows나 Linux와 같은 범용 운영체제에서는 실시간성을 지원하지 않으며, VxWorks, LynxOS 등과 같은 실시간 운영체제에 의존하여 실시간성을 지원한다. 이에 본 논문에서는 실시간 운영체제인 VxWorks에 TAO 통신 미들웨어를 이식함으로써 TAO가 쓰레드 레벨의 실시간성을 지원할 수 있는 환경을 구축한다. 또한 TAO를 탑재한 범용 운영체제 Windows 및 Linux와의 통신을 통해 VxWorks로의 TAO 이식을 검증한다. To support distributed environment that is independent and standardized between heterogeneous system, a study on the TAO (The ACE ORB) communication middleware based on the RT-CORBA is highly being done. The TAO supports real-time features not on the general purpose operating system like Windows or Linux but on the real time operating system like Vxworks or LynxOS. In this paper, we build and construct environment that supports a thread-level real time feature by porting the TAO on VxWorks target. Also we validate the ported TAO by network communication with the TAO of Windows.

로봇 컴포넌트의 QoS 보장을 위한 프레임워크의 설계 및 성능분석

임재석(Jae-Seok Lim),조문행(Moon-Haeng Cho),정재엽(Jae-Yeop Jeong),이철훈(Cheol-Hoon Lee) 한국콘텐츠학회 2009 한국콘텐츠학회논문지 Vol.9 No.2

고성능 CPU의 개발과 고속 통신 기술의 발전은 네트워크 기반의 지능형 서비스 로봇 개발에 대한 연구가 활성화 되는 데에 많은 공헌을 하였다. 로봇 소프트웨어는 로봇의 올바른 수행과 사용자의 안전을 보장해야 하며, 이를 지원하기 위해 로봇 소프트웨어를 구성하는 컴포넌트의 QoS 보장에 대한 연구가 절실히 요구된다. 로봇 컴포넌트의 QoS는 컴포넌트가 원하는 데이터의 흐름을 가능하게 하여 안정적으로 수행함을 목적으로 하며, QoS를 보장함으로써 이러한 로봇의 지능화와 안정성을 얻을 수 있다. 본 논문에서는 제한된 자원을 가진 로봇 플랫폼 상에서 운용되는 로봇 컴포넌트들이 요청한 QoS를 최대한 보장하도록 하는 QoS 프레임워크를 설계하고 구현하였다. 또한 QoS의 요청에 대한 응답시간을 측정하고 그에 따른 성능분석 결과를 제시한다. The growth of CPU and communication technologies have made an important contribution to the development of the network-based intelligent service robots. Robot software must guarantee the correct execution and safety of the user. To achieve this, it is highly required to research how to guarantee the QoS of the components which organize a robot software. The QoS of robot components aims to execute the component stably by processing the data stream in a correct way. By guaranteeing QoS, we can achieve the intelligence and stability of robots. In this paper, we design and implement the QoS framework to guarantee the QoS of robot components on robot platforms with limited resources. We also measure the response times of QoS requests and present the performance analysis results about it.

하라다병 환자에서 섬모체맥락막 삼출로 인해 발생한 양안의 급성 근시와 전방각 폐쇄 1예

김지훈,임재석,이지웅,이지은,엄부섭,Ji Hun Kim,MD,Jae Seok Lim,MD,Ji Woong Lee,MD,Ji Eun Lee,MD,PhD,Boo Sup Oum,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.8

Purpose: To report a case of bilateral acute myopia and angle-closure with ciliochoroidal detachment in Vogt-Koyanagi-Harada (VKH) syndrome. Case summary: A 43-year-old Korean woman diagnosed with VKH syndrome underwent intravenous methylprednisolone steroid pulse treatment. After oral medication was given for 2 days, the anterior chambers became shallow in both eyes. Intraocular pressure (IOP) increased to 25 mm Hg in the right eye and 23 mm Hg in the left eye. Subretinal fluid increased and visual acuity decreased with myopic shift in both eyes. IOP did not decrease despite maximum tolerated medical therapy. Ultrasound biomicroscopy (UBM) revealed that ciliochoroidal effusion caused forward displacement of the lens-iris diaphragm, which resulted in anterior chamber shallowing and angle closure in both eyes. The patient was treated with cycloplegic eyedrops and intravenous steroid pulse therapy. After intravenous steroid pulse treatment was given for 2 days, the anterior chambers became deep in both eyes. IOP reduced to 13 mm Hg and 14 mm Hg in the right and left eye respectively. Visual acuity increased with normalization of myopic shift. UBM revealed that the ciliochoroidal effusion had resolved in both eyes. J Korean Ophthalmol Soc 2012;53(8):1194-1199

임무컴퓨터를 위한 고가용 시스템의 구현 및 성능분석

정재엽(Jae-Yeop Jeong),박성종(Seong-Jong Park),임재석(Jae-Seok Lim),이철훈(Cheol-Hoon Lee) 한국콘텐츠학회 2008 한국콘텐츠학회논문지 Vol.8 No.8

임무컴퓨터는 항공전자시스템에서 임무 수행에 필요한 각종 전술데이터 처리, 영상처리, 항법정보의 관리 및 융합 등의 매우 중요한 기능을 수행한다. 이러한 중요 시스템이 단일시스템으로 구성되면, 여러 가지 SPOF(Single Point Of Failure) 요소의 고장으로 인해 전체 시스템의 고장으로 이어질 수 있다. 이는 서비스 중단으로 인한 임무의 실패뿐만 아니라 조종사의 생명까지도 위협할 수 있다. 본 논문에서는 단일시스템의 이중화를 통해 SPOF 요소를 제거하고, 이를 운영하기 위한 방안으로 리눅스 기반의 Heartbeat, Fake, DRBD(Distributed Replicated Block Device), Bonding 등의 기법을 이용하여 고가용 시스템을 구현하였다. 또한, 구현한 고가용 시스템에서 빠른 고장 탐지를 위한 FDT(Fault Detection Time)와 고장발생 시 임무 연속성을 위해 중요한 요소인 MTTR(Mean Time To Repair)의 평균값을 측정하고, 그에 따른 성능분석 결과를 제시한다. MC(Mission Computer) performs important function in avionics system which tactic data processing, image processing and managing navigation system etc. In general, the fault of SPOF(Single Point Of Failure) in unity system can lead to failure of whole system. It can cause a failure of a mission and also can threaten to the life of the pilot. So, in this paper, we design the HA(Hight-availability) system so that dealing with the failure. And we use HA software like Heartbeat, Fake, DRBD and Bonding to manage HA system. Also we analyze the performance of HA system using the FDT(Fault Detection Time) for fast fault detection and MTTR(Mean Time To Repair) for mission continuity.

POSTOPERATIVE TOXIC SHOCK SYNDROME: REPORT OF A CASE

장현석,권종진,임재석,이갑재,Jang, Hyon-Seok,Kwon, Jong-Jin,Lim, Jae-Seok,Lee, Kab-Jae Korean Association of Maxillofacial Plastic and Re 1999 Maxillofacial Plastic Reconstructive Surgery Vol.21 No.1

Toxic Shock Syndrome(TSS)은 1978년 Todd등에 의해 처음 보고된 이래 젊은 여성에서 월경과 연관된 질환으로 생각되어 왔으나 최근에는 코수술을 비롯한 두경부수술 및 기타 소수술후 합병증으로 많은 증례가 발표되고 있다. 이의 진단은 주로 임상적 진단, 즉 갑작스런 술후 고열, 설서, 저혈압 및 홍피증과 혈액배양등에서 검출되는 포도상구균등으로 가능하다. TSS은 대부분 수액공급 및 혈압의 유지, 전신적인 항생제 투여등으로 쉽게 치료가 가능하지만, 경과가 좋지 않은 경우 면역글로불린의 사용도 시도되어 좋은 결과를 얻고 있으며 조기 발견 및 처치가 가장 중요하다고 할 수 있다. 이에 저자는 상악골 및 비골, 안와근심벽 골절을 지닌 48세 남자환자에서 골절부에 대한 관혈적 정복고정술후 발생된 TSS의 처치에 대해 문헌고찰과 함께 보고하는 바이다. Toxic shock syndrome is an acute disease involving multiple organs. I described here a case of TSS associated with intranasal packing. Four major criteria, which are involvement of multiple organ systems, fever, hypotension or shock, and rash with subsequent desquamation should be fulfilled for the diagnosis. The exact pathogenesis is not well understood, however it is thought to be due to the effects of an enterotoxin produced by certain strains of staphylococcus aureus.

안면부 비후성 반흔에 스테로이드 주사: 증례보고

이바다,권진일,임재석,백지웅,박진후,김형준,Lee, Bada,Kwon, Jin-Il,Lim, Jae-Seok,Baek, Jiwoong,Park, Jin Hoo,Kim, Hyung Jun 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.6

Traumatic lacerations are common in the orofacial region as a result of accidents. Due to the frequent movement of the skin around the mandible, scars in that area are more likely to widen or become hypertrophic. Treatment of facial laceration was performed on three patients and followed by regular check-up. It was discovered that the scars have become hypertrophic, so steroid injections were used. The results were satisfactory with the decrease in sizes and hardnes of the scar. Facial scarring is a particularly distressing phenomenon and has always been a challenge to treat as the scars are more likely to widen or become hyphertrophied due to the frequent movement of the muscle in the facial area. We confirmed that the positive effect of steroid on hypertrophic scars. So, we suggest that proper treatment and periodic follow-up, adjuvant treatments especially steroid injection is necessary in patients with lacerations.

내장형 실시간 운영체제에서 다차원 기법을 이용한 실시간 태스크 스케줄링 알고리즘

조문행(Moon-Haeng Cho),임재석(Jae-Seok Lim),이진욱(Jin-Wook Lee),김주만(Joo-Man Kim),이철훈(Cheol-Hoon Lee) 한국콘텐츠학회 2010 한국콘텐츠학회논문지 Vol.10 No.1

오늘날의 핸드폰, PMP, 지능형 가정기기, 자동차 엔진 컨트롤 시스템과 같은 내장형 시스템은 인간의 삶과 일, 놀이 등 살아가는 환경에 대한 전환을 가져오고 있다. 사용자가 요구하는 다양한 서비스들을 지원하기 위해 내장형 시스템 응용들의 복잡성이 증가하고 있으며, 그런 내장형 컴퓨팅 플랫폼에는 시간결정성을 갖는 실시간 운영체제를 사용해야 한다. 이런 실시간 운영체제의 커널 서비스들은 각 서비스 수행에 얼마만큼의 시간이 소요되는지를 명세하여 시간결정성을 보장하면서 작은 실행 이미지 크기를 가져야만 한다. 이런 정보를 토대로, 응용 개발자들은 각 태스크가 마감시간을 준수하도록 하는 실시간 응용 소프트웨어를 설계할 수 있다. 본 논문에서는 추가적인 메모리 오버헤드 없이 2r 레벨의 우선순위를 갖는 시스템에서 다차원 기법을 이용하여 고정상수 시간 내에 최상위 우선순위를 결정하는 완전 일반화된 실시간 스케줄링 알고리즘을 제안한다. In recent years, embedded systems such as cellular phones, Portable Multimedia Player, intelligent appliance, automobile engine control are reshaping the way people live, work, and play. Thereby, services application to guarantee various requirements of users become increasingly sophisticated and complicated, such embedded computing platforms use real-time operating systems (RTOSs) with time determinism. These RTOSs must not only provide predictable services but must also be efficient and small in size. Kernel services should also be deterministic by specifying how long each service call will take to execute. Having this information allows the application designers to better plan their real-time application software so as not to miss the deadline of each task. In this paper, we present the complete generalized real-time scheduling algorithm using multi-dimensional methodology to determine the highest priority in the ready list with 2r levels of priorities in a constant time without additional memory overhead.

가토 두개골 결손부에서 베타-삼칼슘 인산염 이식 시 혈소판 풍부 섬유소와 혈소판 풍부 혈장의 골형성능에 관한 연구

박정균,주현중,이의석,장현석,임재석,권종진,Park, Jeong-Kyun,Joo, Hyun-Jung,Lee, Ei-Seok,Jang, Hyon-Seok,Lim, Jae-Seok,Kwon, Jong-Jin 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.1

Purpose: Addition of platelet-rich plasma (PRP) and platelet-rich fibrin (PRF) to grafting material has become widely accepted additively for bone regeneration because it can raise high expectations on it's clinical potential. The aim of this study was to evaluate the efficacy of PRP and PRF on early bone regeneration of rabbits when used in combination with beta tricalcium phosphate. Methods: In eight rabbits, the calvarium was exposed and the two marrows were penetrated. After then these artificial bone defects were augmented with ${\beta}$-TCP or ${\beta}$-TCP with PRP or ${\beta}$-TCP with PRF and covered. The animals were sacrificed after four and eight weeks. Histologic findings were observed under the light-microscope and histomorphometric analysis was performed by measuring calcified area of new bone formation within the CSD. Results: They demonstrated that new bone formation tended to be produced along the outline of graft materials. More amounts of newly bone was regenerated in ${\beta}$-TCP only and in combination of${\beta}$-TCP with PRF and it was statistically significant. In contrast, there was no significant difference between nothing apply and ${\beta}$-TCP with PRP groups in the relative amounts of newly mineralized bone. Conclusion: Within the limitation of this study, it can be concluded that PRF in combination with ${\beta}$-TCP showed a positive effect on bone regeneration and statistically it was significant.

주입온도가 Floating Catalyst 법으로 합성한 탄소나노튜브의 구조에 미치는 영향

강은진 ( Eun Jin Kang ),문승환 ( Seung Hwan Moon ),임재석 ( Jae Seok Lim ),함현식 ( Hyun Sik Hahm ),박홍수 ( Hong Soo Park ),임연수 ( Yun Soo Lim ),김명수 ( Myung Soo Kim ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.3

N/A Although the structure of carbon nanotubes is important factor characterizing its properties, it is very difficult to control the structure of carbon nanotubes (MWNTs) and to predict the range of their diameter, which is the primary factor of MWNTs` physical properties. We tried to control the diameter of MWNTsby governing the feed injection temperature of floating catalyst method. The structure of MWNTs was influenced by the phase change of ferrocene fed as the catalyst,. The carbon nanotubes were very narrow at injection temperatures close to the sublimation pt. of ferrocene, in which most MWNTs had diameters in the range of 20~30 ㎚. At injection temperatures between the boiling pt. and melting pt. of ferrocene, the diameters became larger and had broad distribution. However, at injection temperatures higher than the boiling pt., the diameters became narrow again and had very uniform distribution.

메탄 플라즈마 CVD법으로 합성한 탄소나노튜브의 구조적 특성

김명찬 ( Myung Chan Kim ),문승환 ( Seung Hwan Moon ),임재석 ( Jae Seok Lim ),함현식 ( Hyun Sik Hahm ),박홍수 ( Hong Soo Park ),김명수 ( Myung Soo Kim ) 한국유화학회 2004 한국응용과학기술학회지 Vol.21 No.4

N/A Multi-walled carbon nanotubes (CNTs) were prepared by microwave plasma chemical vapor deposition (MPCVD) using various combination of binary catalysts and methane precursor. The maximum yield (10.3 %) of CNTs was obtained using a methane-hydrogen-nitrogen mixture with volume ratio of 1:1:2 at 1000 W of microwave power. As the microwave power increased up to 1000 W, the deposition yield of CNTs raised from 4.1 % to 10. 3 %. However, the prepared CNTs at 800 W showed the more crystalline structure than those prepared at 1000 W. The prepared CNTs over different binary catalysts had various structural conformations such as aligned cylinder, bamboo, and nanofibers. The Id/Ig value of CNTs over Fe-Fe/Al₂O₃, Co-Co/Al₂O₃, and Co-Cu/Al₂O₃ were in the range of 0.89~0.93. Among the various binary catalysts used, Fe-Co./Al₂O₃ showed the highest yield.