두 문화의 밀고 당김

송상용(Song Sangyong) 영남대학교 인문과학연구소 2000 人文硏究 Vol.- No.38

An efficient use of PRAM for an enhancement in the performance and durability of NAND storage systems

Sangyong Lee,Sanghyuk Jung,Yong Ho Song IEEE 2012 IEEE transactions on consumer electronics Vol.58 No.3

<P>NAND flash memory is widely used in many embedded systems owing to such advantages as a small size, shock resistance, and low power consumption. However, NAND flash memory has certain hardware limitations such as an 'erase-before-write' constraint, which creates a long write latency. Therefore, many studies have been performed to reduce the write latency of NAND flash, one of which uses phase-changed RAM (PRAM) as a supplemental device to overcome the disadvantages of NAND flash memory. However, it is difficult to apply PRAM to storage systems owing to its limited density and high cost per capacity. To solve this problem, a novel management scheme for PRAM/NAND flash hybrid storage is proposed. Our proposed method uses limited PRAM space more efficiently by reducing the size of the data to be stored through an efficient compression scheme using differential values and rates. In addition, the proposed method improves the performance and durability of storage systems by efficiently reducing the flash program operation. Our experiments show that the proposed scheme can improve the performance and durability of PRAM/NAND flash hybrid storage with only slight increases in hardware costs.</P>

ppGpp-dependent Stationary Phase Induction of Genes on<i>Salmonella</i>Pathogenicity Island 1

Song, Miryoung,Kim, Hyun-Ju,Kim, Eun Young,Shin, Minsang,Lee, Hyun Chul,Hong, Yeongjin,Rhee, Joon Haeng,Yoon, Hyunjin,Ryu, Sangryeol,Lim, Sangyong,Choy, Hyon E. American Society for Biochemistry and Molecular Bi 2004 The Journal of biological chemistry Vol.279 No.33

Optimal Design of Moving-Magnet Type Actuators for Optical Disk Drives Considering Effect of Coil Electromagnet

Sangyong Kim,Myeong-Gyu Song,No-Cheol Park,Jeonghoon Yoo,Young-Pil Park,Kyoung-Su Park IEEE 2009 IEEE transactions on magnetics Vol.45 No.5

<P>This paper suggests a method for analyzing moving-magnet type actuators for optical pickups. To move the objective lens to the desired position, voice coil actuators use the electromagnetic force, which is the force exerted on a charge moving in a magnetic field. When an electric current passes through a coil, the coil becomes an electromagnet by the solenoid effect. This causes the force between a coil electromagnet and a permanent magnet. The force affects flexible modes of voice coil actuators because it is dynamic force with the frequency same as that of a driving current. Therefore, the analysis, which considers both the electromagnetic force and that between a coil electromagnet and a permanent magnet, is suggested. The moving-magnet-type actuator is fabricated and its dynamic behaviors are measured experimentally to demonstrate and validate the analysis method. As a result, it is verified that the analysis method offers more exact simulations than current methods. Finally, the dynamic behaviors of the moving-magnet-type actuator are improved using the analysis method.</P>

Progress toward a group B streptococcal vaccine

Song, Joon Young,Lim, Jae Hyang,Lim, Sangyong,Yong, Zhi,Seo, Ho Seong TaylorFrancis 2018 Human Vaccines & Immunotherapeutics Vol.14 No.11

<P><B>Abstract</B></P><P><I>Streptococcus agalactiae</I> (group B <I>Streptococcus</I>, GBS) is a leading cause of severe invasive disease in neonate, elderly, and immunocompromised patients worldwide. Despite recent advances in the diagnosis and intrapartum antibiotic prophylaxis (IAP) of GBS infections, it remains one of the most common causes of neonatal morbidity and mortality, causing serious infections. Furthermore, recent studies reported an increasing number of GBS infections in pregnant women and elderly. Although IAP is effective, it has several limitations, including increasing antimicrobial resistance and late GBS infection after negative antenatal screening. Maternal immunization is the most promising and effective countermeasure against GBS infection in neonates. However, no vaccine is available to date, but two types of vaccines, protein subunit and capsular polysaccharide conjugate vaccines, were investigated in clinical trials. Here, we provide an overview of the GBS vaccine development status and recent advances in the development of immunoassays to evaluate the GBS vaccine clinical efficacy.</P>

낸드 플래시 저장장치의 성능 향상을 위한 차분값 압축 방식

이상용(Sangyong Lee),정상혁(Sanghyuk Jung),송용호(Yong Ho Song) 대한전자공학회 2011 대한전자공학회 학술대회 Vol.2011 No.12

There have been researches to reduce long write latency of the NAND flash memory, and one of them is to adopt the data compression scheme. However, the fact that the size of compressed data can be larger than that of original data must be considered when storing the compressed data. If NAND Flash based storage system stores the compressed data without such consideration, the overall performance will be decreased. In order to solve such problem, in this paper, we propose a new technique using the differential data and differential ratio obtained by comparing overwrite data and original data. Our experiment results show that proposed scheme can efficiently reduce the size of data to be stored.

천연 가스하이드레이트로부터 가스생산을 위한 열역학적 연구

이상용(Sangyong Lee),송명호(Myungho Song) 한국신재생에너지학회 2012 한국신재생에너지학회 학술대회논문집 Vol.2012 No.11

다중스레드 계산 모델을 이용한 병렬 객체지향 프로그래밍 환경의 구현 및 성능 평가

송종훈(Jonghoon Song),김흥환(Heungwan Kim),한상영(Sangyong Han) 한국정보과학회 1999 정보과학회 컴퓨팅의 실제 논문지 Vol.5 No.6

본 논문에서 제안하는 시스템은 일반적인 병렬 시스템의 하드웨어 구조에서, 다중 스레드 계산 모델을 이용하여 객체 지향 프로그래밍 환경을 구현한 시스템이다. 제안하는 시스템을 효과적으로 구현하기 위하여 컴파일러와 실행 시간 시스템의 측면에서 여러 가지 기법을 제시한다. 컴파일러의 측면에서는 멤버 변수의 접근 분석, 메소드의 병렬성 분석 기법을 제시하고, 실행 시간 시스템에서는 실시간 스레드/메시지 결합, 프레임 공유 기법을 제시한다. 본 논문에서 제안된 프로그래밍 환경은, MPI 메시지 인터페이스를 이용하여 구현하였으며, 벤치마크 프로그램을 실행함으로써 성능 분석을 하였다. 분석의 결과는 실행시간 시스템의 여러 가지 기법들이 성능 향상에 많은 효과가 있음을 보여주며, 이러한 결과는 일반적인 병렬 시스템에서도 적용 가능하다. In this paper, we suggest an object-oriented programming environment with multithreaded computation model on general parallel processing systems. We developed many methods for our environment to be efficient. in complier, the analysis of member variable and method parallelism, and in runtime system, thread/message merging and frame sharing. The programming environment is implemented with MPI message interlace, and its performance is analyzed with executing benchmark programs. The results show that the developed methods have influence on performance improvement, and this improvement can be applied to general parallel processing systems.

다중스레드 구조에서 병렬 객체지향 계산을 위한 효과적인 실행시간 모델

송종훈(Jonghoon Song),김흥환(Heunghwan Kim),한상영(Sangyong Han) 한국정보과학회 1998 정보과학회논문지 : 시스템 및 이론 Vol.25 No.11

객체지향 기법은, 사용자가 각 객체를 병렬로 실행되는 메시지 전달 장치로 다룰 수 있는 환경을 제공하기 때문에, 병렬 및 분산시스템에서 효과적으로 이용될 수 있는 패러다임이다. 그러나, 다중스레드 구조에 기초한 객체지향 환경은 빈번한 프레임의 할당 요청으로 인해서, 다른 계산 환경에 비해 메시지 교환량에 따른 오버헤드가 크다. 본 논문에서는 다중스레드 구조에 기반을 두고 있는 객체 지향 시스템 OOId/DAVRID에서 객체지향 계산의 성능을 향상시킬 수 있는 실행시간 모델을 제안한다. 이 모델은 클래스 상속을 효과적으로 지원하며, 메시지 오버헤드를 줄이기 위해서 기존의 객체 프레임 할당과 멤버 함수 호출을 개선하였으며, 변경 가능한(mutable) 멤버를 효과적으로 접근하도록 하였다. 성능분석의 결과는 제안된 모델이 기존의 모델보다 성능이 우수함을 보여준다. 그리고, 그 성능 향상의 정도는 많은 객체가 동적으로 생성되어 객체 관련 메시지가 빈번한 응용에서 더 크게 나타남을 확인할 수 있었다. The object-oriented paradigm is ideal for parallel and distributed systems, because users can naturally treat an object as the message-passing unit which is executed concurrently. But, in the object-oriented environment based on multithreaded architecture, the message traffic is heavier than in other environments because of the frequent requests for frame allocation We suggest a runtime model on object-oriented system OOId/DAVRID, which can improve the performance of object-oriented computing in multithreaded architecture. This model supports class inheritance efficiently and improves the object frame allocation and member function call to reduce the message overhead. It also allows efficient access to the mutable member. The simulation results show that the proposed model is superior to a previous model in performance and the performance gain is larger in the application where many objects are dynamically created.

Shelf-life extension of preservative-free hydrated feed using gamma pasteurization and its effect on growth performance of eel

Kim, Dongho,Song, Hyunpa,Lim, Sangyong,Jo, Minho,Song, Duseop,Jo, Cheorun Elsevier 2012 Radiation physics and chemistry Vol.81 No.8

<P><B>Abstract</B></P><P>Hydrated feed (HF) promotes the growth performance and shortens the feeding time of fish by increasing the efficiency of digestion. However, the shelf-life of HF is a concern due to its relatively higher water content. In this study, radiation pasteurization was applied to improve the shelf-life and microbiological quality of HF for fish farming. Preservative-free HF containing 25% moisture was gamma-irradiated and its microbiological and nutritional properties evaluated in addition to a practical feeding trial carried out using eel. The viable counts of bacteria and fungi in HF were 10<SUP>6</SUP> and 10<SUP>4</SUP>CFU/g, respectively. All coliform bacteria and yeast in HF were eliminated by irradiation at a dose of 5kGy, and total aerobic bacteria were eliminated at 10kGy. The shelf-life of the preservative-free and irradiated (10kGy) HF was estimated as 6 months under ambient conditions. The nutritional composition of HF was stable up to 10kGy of irradiation. Based on a feeding trial, it was proven that eel fed HF had about 20% higher growth rate than that fed dried feed.</P> <P><B>Highlights</B></P><P>► Hydrated feed (HF) promotes the growth performance and shortens the feeding time of fish but shelf-life is a concern. ► Radiation pasteurization was applied to improve the shelf-life and microbiological quality of HF for fish farming. ► The shelf-life of the preservative-free and irradiated (10kGy) HF was estimated as 6 months under ambient conditions. ► Eel fed HF had about 20% higher growth rate than that fed dried feed in feeding trial.</P>