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Search Results: 1 - 10 of 2583 matches for " Sooman Jeong "
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Framework for Analyzing Android I/O Stack Behavior: From Generating theWorkload to Analyzing the Trace
Sooman Jeong,Kisung Lee,Jungwoo Hwang,Seongjin Lee,Youjip Won
Future Internet , 2013, DOI: 10.3390/fi5040591
Abstract: The existing I/O workload generators and trace capturing tools are not adaptable to generating nor capturing the I/O requests of Android apps. The Android platform needs proper tools to capture and replay real world workload in the Android platform to verify the result of benchmark tools. This paper introduces Android Storage Performance Analysis Tool, AndroStep, which is specifically designed for characterizing and analyzing the behavior of the I/O subsystem in Android based devices. The AndroStep consists of Mobibench (workload generator), MOST (Mobile Storage Analyzer), and Mobigen (workload replayer). Mobibench is an Android app that generates a filesystem as well as SQLite database operations. Mobibench can also vary the number of concurrent threads to examining the filesystem scalability to support concurrency, e.g., metadata updates, journal file creation/deletion. MOST captures the trace and extracts key filesystem access characteristics such as access pattern with respect to file types, ratio between random vs. sequential access, ratio between buffered vs. synchronous I/O, fraction of metadata accesses, etc. MOST implements reverse mapping feature (finding an inode for a given block) and retrospective reverse mapping (finding an inode for a deleted file). Mobigen is a trace capturing and replaying tool that is specifically designed to perform the user experiment without actual human intervention. Mobigen records the system calls generated from the user behavior and sanitizes the trace for replayable form. Mobigen can replay this trace on different Android platforms or with different I/O stack configurations. As an example of using AndroStep, we analyzed the performances of twelve Android smartphones and the SQLite performances on five different filesystems. AndroStep makes otherwise time consuming I/O stack analysis extremely versatile. AndroStep makes a significant contribution in terms of shedding light on internal behavior of the Android I/O stack.
Characteristics of QCD Phase Transitions in an Extended Skyrme Model on $S^3$
Joon Ha Kim,Sooman Yee,Hyun Kyu Lee
Physics , 1994, DOI: 10.1103/PhysRevD.53.1715
Abstract: We study the characteristics of the QCD phase transitions in dense hadronic matter using the Skyrme model constructed on S^3. We find numerically the localized solutions on $S^3$ using the extended Skyrme model which implements correctly the scale symmetry of QCD. The transition from the localized phase to the delocalized phase is found to be of first order at the critical radius of the hypersphere, $L_c$. The chiral restoration and the gluon decondensation also take place at the same critical size.
On a direct approach to quasideterminant solutions of a noncommutative modified KP equation
C. R. Gilson,J. J. C. Nimmo,C. M. Sooman
Physics , 2007, DOI: 10.1088/1751-8113/40/14/007
Abstract: A noncommutative version of the modified KP equation and a family of its solutions expressed as quasideterminants are discussed. The origin of these solutions is explained by means of Darboux transformations and the solutions are verified directly. We also verify directly an explicit connection between quasideterminant solutions of the noncommutative mKP equation and the noncommutative KP equation arising from the Miura transformation.
Matrix solutions of a noncommutative KP equation and a noncommutative mKP equation
C. R. Gilson,J. J. C. Nimmo,C. M. Sooman
Physics , 2008, DOI: 10.1007/s11232-009-0068-5
Abstract: Matrix solutions of a noncommutative KP and a noncommutative mKP equation which can be expressed as quasideterminants are discussed. In particular, we investigate interaction properties of two-soliton solutions.
Evaluation of Network Stack Optimization Techniques for Wireless Sensor Networks  [PDF]
Jaein JEONG
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.28083
Abstract: We present a network stack implementation for a wireless sensor platform based on a byte-level radio. The network stack provides error-correction code, multi-channel capability and reliable communication for a high packet reception rate as well as a basic packet-level communication interface. In outdoor tests, the packet reception rate is close to 100% within 800 ft and is reasonably good up to 1100 ft. This is made possible by using error correction code and a reliable transport layer. Our implementation also allows us to choose a fre-quency among multiple channels. By using multiple frequencies as well as a reliable transport layer, we can achieve a high packet reception rate by paying additional retransmission time when collisions increase with additional sensor nodes.
Characterization of Multicultural Values: Affective Impact of Writing Extensive Journals in a University-Level Course  [PDF]
Taekhil Jeong
Creative Education (CE) , 2013, DOI: 10.4236/ce.2013.47A2022
Abstract:

The highest educational objective of affective domain is characterization, which refers to the level of character development where individuals’ behaviors and values remain consistent. Because the educational objectives of affect are categorically different from cognitive educational objectives, an alternative pedagogical conceptualization that integrates teaching, learning, and evaluating aspects of character development is essential in multicultural education. The current action research presents: 1) a rubric of multicultural education journal writing that evaluates the quality of students’ journals; 2) coherent journal topics and accessible resources for journal entries; and 3) exemplary student journals that sufficiently meet the criteria of rubric, topic, and resource requirements. The presented rubric, topics, resources, and actual student journal examples may serve as a model that both multicultural education teachers and students alike can utilize in their teaching and learning practices.

A Study on the Impact of South Korea’s Official Developmental Assistance Policy toward Vietnam  [PDF]
Seungho Jeong
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.98091
Abstract: The purpose of this research paper is to study and analyze the Official Development Assistance (ODA) policy of South Korea toward Vietnam. The research methodology used was qualitative and relied on processed information from secondary sources. It is noted that South Korea has been a major foreign aid partner of Vietnam since it became a donor member of the Development Assistance Committee (DAC). Currently, South Korea preferentially gives Vietnam the largest share of its donor funds in the form of concessional loans and grants. Also found in this investigation is that the main determinant of this sizable ODA is in the form of commercial opportunities available in the recipient country and the rich diplomatic relations shared by the two countries. South Korea has realized commercial benefits such as an expanded market for exports, employment opportunities for its citizens, and foreign direct investment (FDI) chances in Vietnam as a result of this ODA volume. On the other hand, Vietnam has used money received to immensely transform its economy. In conclusion, the ODA policy of South Korea toward Vietnam has been found to be largely beneficial for both countries.
Incremental Network Programming for Wireless Sensors  [PDF]
Jaein JEONG, David CULLER
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2009, DOI: 10.4236/ijcns.2009.25048
Abstract: We present an incremental network programming mechanism which reprograms wireless sensors quickly by transmitting the incremental changes using the Rsync algorithm; we generate the difference of the two program images allowing us to distribute only the key changes. Unlike previous approaches, our design does not assume any prior knowledge of the program code structure and can be applied to any hardware platform. To meet the resource constraints of wireless sensors, we tuned the Rsync algorithm which was originally made for updating binary files among powerful host machines. The sensor node processes the delivery and the decoding of the difference script separately making it easy to extend for multi-hop network programming. We are able to get a speed-up of 9.1 for changing a constant and 2.1 to 2.5 for changing a few lines in the source code.
Epithelioid sarcoma of the spine: a case report and review  [PDF]
Jeong Hyun Yoo
Open Journal of Clinical Diagnostics (OJCD) , 2011, DOI: 10.4236/ojcd.2011.11001
Abstract: Epithelioid sarcoma is a rare malignant soft tissue neoplasm commonly involving extremities of young adults and rarely occurring in the trunk area. It re-sembles a chronic inflammatory process and mimics benign reactive granuloma or other benign diseases. Despite its indolence and slow growth, the prognosis is poor with high recurrence and early lymph node spreading and hematogeneous distant metastasis. Involvement of the spine is extremely rare and diffi-cult to diagnose correctly in clinical presentation and pathology. We describe our experience a case of epi-thelioid sarcoma involving lumbar spine. A pre-ope- rative spine MRI showed a large solid and necrotic paraspinal mass which extended into the spinal canal with cord compression, and bone destruction. Final correct diagnosis was confirmed by immunohisto-chemical studies. When young adults present with a spinal lesion that has unusual large necrotic soft tissue mass, immunohistochemical studies are recommended for promptly determining the possibility of spinal epithelioid sarcoma.
Scalable Incremental Network Programming for Multihop Wireless Sensors  [PDF]
Jaein Jeong, David Culler
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.61005
Abstract:

We present a network programming mechanism that can flexibly and quickly re-task a large multi-hop network of wireless sensor nodes. Our mechanism allows each sensor node to be incrementally reprogrammed with heterogeneous images of native program code using Rsync block comparison algorithm, point-to-point routing with the BLIP IPv6 stack, and image volume management with Deluge2. With our re-tasking method, we demonstrate an order of magnitude speed-up on small code changes over non-incremental delivery. Our mechanism also scales sub-linearly in the diameter of the network. Collectively, these advancements qualitatively change the software life cycle of the embedded networked systems.

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