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Tri-State Coding Using Reconfiguration of Twisted Ring Counter for Test Data Compression
Sungyoul Seo,Yong Lee,Sungho Kang IEEE 2016 IEEE transactions on computer-aided design of inte Vol.35 No.2
<P>As technology processes scale up and design complexities grow, system-on-chip integration continues to rise rapidly. According to these trends, increasing test data volume is one of the biggest challenges in the testing industry. In this paper, we present a new test data compression method based on reusing a stored set with tri-state coding (TSC). For improving the compression efficiency, a twisted ring counter is used to reconfigure twist function. It is useful to reuse previously used data for making next data by using the function of feedback of the ring counter. Moreover, the TSC is used to increase the range information transmission without additional input ports. Experimental results show that this compression method improves a compression ratio and a test time on both International Symposium on Circuits and Systems'89 and large International Test Conference'99 benchmark circuits in most cases compared to the results of the previous work without a heavy burden on the hardware.</P>
A Study on the Group Technology Based University Classroom Coding Scheme
Sungyoul Lee 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.2
Effective class to classroom scheduling is critical to perform the academic mission successfully in the University. This practice enables students to take the classes they need in a timely manner and contributes to space utilization as well as both classes and classrooms are scheduled efficiently to support the needs of students, faculty and the institution as a whole. Most institutions handle this scheduling with a manual process coordinating multiple department associates and staff members of the Registration Office. Often, a manual process such as this leads to a number of difficulties and is prone to errors. In light of these challenges, Group Technology (GT) provides a potential answer. GT is a manufacturing technique in which parts having similarities in geometry and manufacturing process are manufactured in one location using a specific set of machines or processes. This paper describes the design of a GT based classroom coding scheme that assists the staff at the University to allocate classrooms for a given semester. This scheme accommodates the most important attributes which identify a specific classroom to be selected. These attributes include classroom size, classroom type, distance from the department, and technology or other room requirements. Consequently, the proposed scheme makes class to classroom allocation issue easy and efficient.
Mn-doped ZnGeAs2 and ZnSnAs2 Single Crystals: Growth and Electrical and Magnetic Properties
Sungyoul Choi,최정용,John B. Ketterson,Soon Cheol Hong,Sunglae Cho,Yunki Kim 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
We have fabricated Mn-doped chalcopyrite ZnGeAs$_2$ and ZnSnAs$_2$ single crystals using vertical temperature gradient method. We have found out that Mn-doped ZnGeAs$_2$ and ZnSnAs$_2$ single crystals showed room-temperature ferromagnetism with Curie temperature of 333 and 329 K, respectively.
Clustering Parts Based on the Design and Manufacturing Similarities Using a Genetic Algorithm
Sungyoul Lee 한국산업정보학회 2011 한국산업정보학회논문지 Vol.16 No.4
The part family (PF) formation in a cellular manufacturing has been a key issue for the successful implementation of Group Technology (GT). Basically, a part has two different attributes; i.e., design and manufacturing. The respective similarity in both attributes is often conflicting each other. However, the two attributes should be taken into account appropriately in order for the PF to maximize the benefits of the GT implementation. This paper proposes a clustering algorithm which considers the two attributes simultaneously based on pareto optimal theory. The similarity in each attribute can be represented as two individual objective functions. Then, the resulting two objective functions are properly combined into a pareto fitness function which assigns a single fitness value to each solution based on the two objective functions. A GA is used to find the pareto optimal set of solutions based on the fitness function. A set of hypothetical parts are grouped using the proposed system. The results show that the proposed system is very promising in clustering with multiple objectives.
A Seamless and Autonomous Mode Transfer Method of Grid-connected Inverter with Critical Load
Sungyoul Park,Sewan Choi,Minho Kwon 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
A grid-connected inverter with critical loads should be able to supply a stable voltage to critical loads at the instant of a mode change as well as during clearing time while detecting unintentional islanding. This paper proposes a mode transfer method for a grid connected inverter with the critical loads. The proposed method, which integrates grid-connected mode control loop and islanded mode control loop into one control block, provides autonomous and seamless mode transfer from the current control to voltage control. Therefore, the proposed schemes can supply a stable voltage to critical loads at the mode change instant as well as during the clearing time. To validate the proposed method, experimental results are provided.
Temperature Dependence of Metal-Insulator Transition in Mn-Doped p-Type GaAs
Sungyoul Choi,최정용,Sunglae Cho,이용욱,Bongjun Kim,Huyntak Kim 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.50 No.3
We have successfully fabricated an epitaxial Mn-doped p-type GaAs thin film on a GaAs(001) substrate by using molecular beam epitaxy at a substrate temperature of 500 $^\circ$C. For the Mn-doped GaAs thin film with a hole concentration of $n_p \approx 2.0 \times 10^{17}$ cm$^{-3}$, an abrupt first-order metal-insulator transition (MIT) is observed at room temperature. The temperature dependence of the resistivity does not show a structural phase transition up to 420 K. The MIT temperature is controlled by applying a voltage without external hole doping. The abrupt MIT is discussed, along with breakdown.