형상에 독립적인 부하 평형 기법

송의석,오하령 국민대학교 생산기술연구소 2004 공학기술논문집 Vol.27 No.-

This paper proposes a heuristic load balancing method for multiprocessor systems. The method minimizes the number of idle links to distribute load traffic and reduces its communication cost. Each processor iteratively tries to transfer unit load to/from every neighbor processors. However, real load transfer is collectively done after complete load traffic calculation to minimize useless traffic. The proposed method can be employed in various interconnection topologies. In this paper, it is applied to general graph environments. For performance evaluation, simulation studies are performed. The performance of proposed method is compared to those of two well-known algorithms. The results show that the proposed method always balances the loads perfectly. Furthermore, it reduces the communication costs by 13-42% compared to existing algorithms.

대용량 온라인 게임 서버 설계 및 구현

배성우,오하령 국민대학교 생산기술연구소 2003 공학기술논문집 Vol.26 No.-

In this paper, a distributed game server system architecture for massively multiplayer online games is designed and implemented. For load distribution, the entire game region is partitioned into a set of smaller regions. Then each partitioned region is implemented by a game process. A connection server is a bridge between game clients and servers. Communication loads can be distributed by use of connection servers. The proposed system is implemented on a FreeBSD environment.

이더넷과 TCP/IP를 지원하는 범용 제어보드 개발

김용각,안현식,오하령 국민대학교 생산기술연구소 2002 공학기술논문집 Vol.25 No.-

As internet becomes popular, it is common that embedded systems support network interfaces such as Ethernet. Many commercial real time operating system can handle various network interfaces. But they are too expensive to be used on cheap controller systems and need too much resources such as memory. In this paper, a microprocessor board with Ethernet controller is developed. uCOS and TCP/IP stack called uCIP which is based on BSD code is ported on that board. uCIP supports various related protocols such as ARP, ICMP, IP, UDP and TCP. It operates stably by fixing some bugs in original uCIP. DHCP is implemented and added to original uCIP.

가변 임계값을 갖는 JPEG 영상의 양자화 방법

오하령(Ha Ryoung Oh),윤석현(Seok Hyun Yoon),성영락(Yeong Rak Seong) 한국정보처리학회 1999 정보처리학회논문지 Vol.6 No.11

In this paper, VTQM(Variable Threshold Quantization Method) is proposed, which enhances PSNR by composing the advantages of round off and truncation quantization methods. From vast experiments. PSNR's of JPEG image with the method are compared with that of standard JPEG methods. At the boundary which affects the compression ratio. VTQM quantizes with a new threshold to reduce the length of compressed data; otherwise, VTQM employs the round off quantization method to preserve the original image information. As a result, VTQM reduces bit rate while preserving the image quality. The experimental results show that VTQM enhances PSNR by 0.2~0.3%u33C8. 0.4~0.5%u33C8 with the same bit rate those of the traditional truncation and round-off quantization methods, respectively.

서브넷의 동적인 특성에 기초를 둔 페트리넷 축약 방법

오하령(Oh Ha Ryoung),김준형(Kim Jun Hyung) 한국정보과학회 1995 정보과학회논문지 Vol.22 No.4

페트리망은 병열성, 동기화 및 충돌 등을 표현할 수 있는 수학적이고 시각적인 모델로서 여러 분야에서 널리 사용되고 있다. 페트리망의 여러 가지 좋은 특성에도 불구하고 복잡한 시스템 분석의 근본적인 문제점은 도달 가능한 모든 상태를 검토하기에는 너무나 많은 시간 혹은 기억공간을 필요로 한다는 것이며 페트리망의 분석은 일반적으로 지수함수 이상의 복잡도를 갖는 것으로 알려져 있다. 본 논문에는 원시 페트리망의 중요한 정보를 유지하면서 상태공간을 줄일 수 있도록 변환 가능한 서브?을 계층적으로 변환하는 페트리망의 축약 방법이 제시되었다. 제안된 서브?은 Suzuki, Murara의 k-well-behaved module의 개념을 확장한 것이며 서브? 외부와의 작용을 허용하도록 transition의 외향 에지중 일부를 삭제 가능토록 하였다. Petri net has been used widely in various domains, which is a mathematical and graphical model providing a formalism for concurrency, synchronization and conflict. Despite many excellent features of Petri net, the inherent problem with Petri net analysis is that it may be impossible to generate and check all reachable states of Petri net in reasonable time or storage for complex systems. The complexity is known to be at least exponential and may not even be decidable. In this paper a method of hierarchical Petri net abstraction based on the convertible subnet is proposed, which can reduce the state space of complex Petri net while preserving sufficient information of the original net. The proposed subnet is an extension of Suzuki and Murata′s k-well-behaved module and some outgoing edges of transitions can be removed so that the module may have side effects on the rest of the system.

HPPD 저해 제초제에 대한 벼 품종별 약해 반응

권오도(Oh Do Kwon),신서호(Seo Ho Shin),안규남(Kyu Nam An),이인(Yeen Lee),민현경(Hyun Kyeong Min),박흥규(Heung Gyu Park),신해룡(Hae Ryoung Shin),정하일(Ha-Il Jung),국용인(Yong In Kuk) 韓國雜草學會 2012 Weed&Turfgrass Science Vol.32 No.3

본 연구의 목적은 설포닐우레아계 제초제에 대한 저항성 잡초종 방제에 효과적인 HPPD(4-hydroxy phenylpyruvate dioxygenase) 저해 제초제, mestrione, benzobicyclone 및 tefuryltrion에 대한 벼 품종 간의 약해정도를 구명하기 위하여 수행하였다. 총 26 벼 품종(통일형 8품종 그리고 일본형 18품종)은 육묘상자에서 25일 동안 생육시킨 후 이앙하였고, 이앙 후 5, 10, 그리고 15일에 각각의 제초제를 표준량 그리고 배량을 처리하였다. 비록 mestrione, benzobicyclone 및 tefuryltrion 제초제가 동일한 HPPD 저해 제초제들이지만 이들 제초제의 처리 시기나 약량에 따라 벼 품종별 약해정도와 증상은 서로 상이하였다. 시험약제 모두에서 통일형 품종이 일본형 품종보다 약해가 심하게 발생하였다. Mesotrione은 약량이 증가할수록, benzobicyclon은 처리시기가 빠르고 약량이 증가할수록 약해가 심하였다. 반면에 tefuryltrion은 처리시기와 약량에 따라 품종간의 약해변이는 크지 않았다. Mesotrione과 benzobicyclon에 대한 통일형 품종인 한강찰벼 1호와 향미벼 1호, 초다수성 품종인 남천벼, 다산벼, 아름벼, 그리고 한아름벼 품종들의 약해는 처리시기 및 약량에 관계없이 백화, 잎과 줄기의 갈변, 잎 꺾임, 괴사를 동반한 5~8 정도의 약해 증상을 보인 반면에 tefuryltrion은 단지 1~3 정도의 황화 및 백화, 갈변 증상만을 보였다. 일본형 품종에 대한 약해는 제초제의 처리시 기와 약량에 따라 1~2 정도의 가벼운 약해 증상을 보였지만 제초제 종류에 따라 품종간에 유의적인 차이를 나타냈다. 13개의 일본형 품종들은 benzobicyclone에 대해 민감하였으며, 일본형 4품종과 7품종들은 각각의 mestrione과 tefuryltrion에 대해 황화 및 백화를 동반한 증상이 나타났다. 그러므로 mestrione과 benzobicyclone, 그리고 tefuryltrion 성분이 함유된 혼합제는 처리시기 및 처리약량에 관계없이 벼 생태형 간에 심각한 약해 증상을 나타내므로 식용(기능성용 및 가공용 벼) 또는 사료용을 위한 벼 재배 포장에서의 사용을 지양해야 할 것으로 사료된다. The objectives of this study were to investigate the levels of phytotoxicity of rice varieties to HPPD (4-hydroxy phenylpyruvate dioxygenase)-inhibiting herbicides known for their efficiency to control the sulfonylureas-resistant weed species:mestrione, benzobicyclone, and tefuryltrione. The twenty-six rice varieties (8-Japonica ⨯ Indica-type varieties and 18-Japonica-type varieties) were grown for 25 days on seedling trays and then transplanted to paddy rice fields followed by herbicide treatment i.e. standard and double doses of there respective herbicides at 5, 10, and 15 days after transplanting. Although mestrione, benzobicyclone and tefuryltrione are all HPPD-inhibiting herbicides, the phytotoxicity symptoms of the different rice varieties based on the timing of application and doses of the herbicides were significantly different. The Japonica ⨯ Indica-type varieties showed much more phytotoxicity symptoms than Japonica-type varieties in all applied herbicides. Increasing herbicidal doses of mesotrione, and an earlier application of and increasing herbicidal doses of benzobicyclon caused severe phytotoxicity symptoms. On the other hand, phytotoxicity due to tefuryltrione did not exhibit significant differences between rice varieties in either the timing of application or dose of the herbicide. Regardless of timing of application and dose of the herbicides, Hangangchalbyeo-1, Hyangmibyeo-1 and high-yield rice varieties such as Namcheonbyeo, Dasanbyeo, Areumbyeo, and Hanareumbyeo, which belong to the Japonica ⨯ Indica-type varieties, showed 5 to 8 levels of phytotoxicity symptoms including albinism, browning, detached leaf, and necrosis to mesotrione and benzobicyclon whereas only 1 to 3 levels of phytotoxicity symptoms (chlorosis, albinism, and browning) were seen with to tefuryltrione application. The Japonica-type varieties exhibited only slight phytotoxicity symptoms (1~2 levels) in conformity with the timing of application and doses of the herbicides. However, there were significant differences among the Japonica-type rice varieties, depending on the type of herbicide. Thirteen-Japonica type rice varieties were sensitive to benzobicyclone while 4-Japonica-type and 7-Japonica-type varieties showed phytotoxicity symptoms such as chlorosis and albinism with mestrione and tefuryltrione application, respectively. Therefore, we suggest that the combined-type herbicides including mestrione, benzobicyclone and tefuryltrione should be rejected in paddy fields where rice is grown for either human consumption (functional or processed rice) or livestock feed because of severe phytotoxicity symptoms on the various rice varieties seen regardless of the timing of application and doses of the herbicides.

Higher infiltration by Th17 cells compared with regulatory T cells is associated with severe acute T-cell-mediated graft rejection

Chung, Byung-Ha,Oh, Hye-Jwa,Piao, Shang Guo,Sun, In-O,Kang, Seok-Hui,Choi, Sun-Ryoung,Park, Hoon-Suk,Choi, Bum-Soon,Choi, Yeong-Jin,Park, Cheol-Whee,Kim, Yong-Soo,Cho, Mi-La,Yang, Chul-Woo Korean Society for Biochemistry and Molecular Bion 2011 Experimental and molecular medicine Vol.43 No.11

The aim of this study was to evaluate whether the Th17 and Treg cell infiltration into allograft tissue is associated with the severity of allograft dysfunction and tissue injury in acute T cell-mediated rejection (ATCMR). Seventy-one allograft tissues with biopsy-proven ATCMR were included. The biopsy specimens were immunostained for FOXP3 and IL-17. The allograft function was assessed at biopsy by measuring serum creatinine (Scr) concentration, and by applying the modified diet in renal disease (MDRD) formula, which provides the estimated glomerular filtration rate (eGFR). The severity of allograft tissue injury was assessed by calculating tissue injury scores using the Banff classification. The average numbers of infiltrating Treg and Th17 cells were $11.6{\pm}12.2cells/mm^2$ and $5.6{\pm}8.0cells/mm^2$, respectively. The average Treg/Th17 ratio was $5.6{\pm}8.2$. The Treg/Th17 ratio was significantly associated with allograft function (Scr and MDRD eGFR) and with the severity of interstitial injury and tubular injury ($P$ < 0.05, all parameters). In separate analyses of the number of infiltrating Treg and Th17 cells, Th17 cell infiltration was significantly associated with allograft function and the severity of tissue injury. By contrast, Treg cell infiltration was not significantly associated with allograft dysfunction or the severity of tissue injury. The results of this study show that higher infiltration of Th17 cell compared with Treg cell is significantly associated with the severity of allograft dysfunction and tissue injury.

Simulation of a Mobile IoT System Using the DEVS Formalism

( Jung Hyun Im ),( Ha-ryoung Oh ),( Yeong Rak Seong ) 한국정보처리학회 2021 Journal of information processing systems Vol.17 No.1

This paper proposes two novel methods to model and simulate a mobile Internet of Things (IoT) system using the discrete event system specification (DEVS) formalism. In traditional simulation methods, it is advantageous to partition the simulation area hierarchically to reduce simulation time; however, in this case, the structure of the model may change as the IoT nodes to be modeled move. The proposed methods reduce the simulation time while maintaining the model structure, even when the IoT nodes move. To evaluate the performance of the proposed methods, a prototype mobile IoT system was modeled and simulated. The simulation results show that the proposed methods achieve good performance, even if the number of IoT nodes or the movement of IoT nodes increases.

The Prognostic Value of Residual Volume/Total Lung Capacity in Patients with Chronic Obstructive Pulmonary Disease

Shin, Tae Rim,Oh, Yeon-Mok,Park, Joo Hun,Lee, Keu Sung,Oh, Sunghee,Kang, Dae Ryoung,Sheen, Seungsoo,Seo, Joon Beom,Yoo, Kwang Ha,Lee, Ji-Hyun,Kim, Tae-Hyung,Lim, Seong Yong,Yoon, Ho Il,Rhee, Chin Kook The Korean Academy of Medical Sciences 2015 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.30 No.10

Construction of Concurrent Programs Based on a Modeling and Simulation Formalism

Jung Hyun Im,Ha-Ryoung Oh,Yeong Rak Seong 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.10

This paper proposes a framework for developing a concurrent program using the discrete event system specification (DEVS) formalism. Within the proposed framework, a concurrent program is modeled by the DEVS formalism, and the modeling result is validated through simulation in a DEVS abstract simulator environment, called DEVSim++. Then, the validated modeling results are translated to multi-threaded program codes written in a conventional programming language. For that, each DEVS model which specifies behavior of a component is converted to a single thread, called an atomic thread, and every connection information between the components are clustered together and converted to a data structure, called a port mapping table. This paper also proposes an efficient solution which combines several atomic threads into a new thread, called a combined thread.