• The Transactions of the Korea Information Processing Society
• /
• v.4 no.3
• /
• pp.649-658
• /
• 1997

Database management systems(DMBS)using bolatile memory shluld have a recovery function to protect data against system failutes.Recovery requires much overhead in transaction proessing and is one of the great factors that deteriorate the system performance.Recently, there have been a lot of studies on database systems with nonbolatile memory to enhance the performance.A nonbolatile memory called DFeRAM is one of the promising memory devices of the future technology, but this device does not support fine-franularity licking.In this paper, we present a dual plane FeRAM(DFeRAM)architecture to support the fine-granularity locking.We also propose a recovery algorithm for the database system with the DFeRAM based on a shadow paging methed.In order to analze the performance of the proposed algorithm, we present an analytical model and analyze the performance using the moedl.

• The Transactions of the Korea Information Processing Society
• /
• v.4 no.2
• /
• pp.338-348
• /
• 1997

In this pater, we first propose a data distribution framework to resolve load imbalance and bucket oerflow in parallel hash join.Using the histogram equalization technique, the framework transforms a histogram of skewed data to the desired uniform distribution that corresponds to the relative computing power of node processors in the system.Next we propose an effcient parallel hash join algorithm for handing skwed data based on the proposed data distribution methodology.For performance comparison of our algorithm with other hash join algorithms.we perform similation experiments and actual exeution on COREDB database computer with 8-node hyperube architecture. In these experiments, skwed data distebution of the join atteibute is modeled using a Zipf-like distribution.The perfomance studies undicate that our algorithm outperforms other algorithms in the skewed cases.

• Journal of the Korean Institute of Educational Facilities
• /
• v.6 no.2
• /
• pp.13-23
• /
• 1999

This paper seeks to find out the policies of management and layout of middle school rooms for the community people's use. This paper surveys community's needs with respect to both the use of school rooms before, during, and after classes and preferences of use of school rooms. This paper adopts two experimental case studies to find out the models. It uses t-test analysis of the statistics to find out community people's preferences for the use of school rooms between two communities in an urban area, and uses simple and multiple regression analyses to develop models concerning community people's uses of school rooms before, during, and after classes. It also uses cluster analysis to find out the cluster among community people's preference of school rooms. It found, first, that community people's use of school rooms after class can be influenced by the uses of a play ground, a music classroom, an audio visual classroom, and a gymnasium. The use during regular classes is related to the uses of the fine arts classroom, a general classroom, a home economics classroom, a gymnasium, and a playground. The use before class is affected by the uses of a fine arts classroom, a playground, and a library. It also found that, with respect to community people's preferential use of school rooms, the rooms can be clustered as a cluster of laboratories such as a general classroom, a music room, a fine arts classroom, a science classroom, a home economics classroom, and a technique classroom, a cluster of athletic areas such as a gymnasium and a playground, and a cluster of supporting facilities such as a library, an audio visual classroom, and a computer classroom. Those clusters can also be clustered in more detail, i. e., that both a general classroom and playground can be apart from a cluster of laboratories or a cluster of supporting facilities; that an audio visual classroom can be fostered into a cluster with a home economics affairs classroom and a technique classroom. Finally this paper suggests policies of management and layout of school rooms.

• KIPS Transactions on Computer and Communication Systems
• /
• v.4 no.11
• /
• pp.383-390
• /
• 2015

It is appropriate to use the NETCONF to monitor and manage today's complex networks that are composed of variety links and heterogeneous equipment. Since the first standard of the NETCONF are launched, there have been several revisions, but disadvantages of each layer capabilities is still present and the most typical disadvantage is XML document processing efficiency of the Content layer. In this paper, we perform data modeling by constructing a sub-tree based on the dependencies between Content layer data, and suggest method of extract efficiently data from XML by applying the extended VTD-XML technique for the XPath query. We performs experiment to compare NETCONF in proposed method to NETCONF in previous studies and NETCONF standard. we validate superiority of improved NETCONF in the paper. As experimental results, we verify that improved NETCONF is better than the other two NETCONF each 4% and 10% in terms of query processing rate, and faster than each 3.9 seconds and 10.4 seconds in terms of query processing speed.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• v.5 no.3
• /
• pp.206-215
• /
• 2005

In this paper, we propose a new design method of Genetic Algorithm Processor(GAP) and Evolvable Hardware(EHW). All sorts of creature evolve its structure or shape in order to adapt itself to environments. Evolutionary Computation based on the process of natural selection not only searches the quasi-optimal solution through the evolution process, but also changes the structure to get best results. On the other hand, Genetic Algorithm(GA) is good fur finding solutions of complex optimization problems. However, it has a major drawback, which is its slow execution speed when is implemented in software of a conventional computer. Parallel processing has been one approach to overcome the speed problem of GA. In a point of view of GA, long bit string length caused the system of GA to spend much time that clear up the problem. Evolvable Hardware refers to the automation of electronic circuit design through artificial evolution, and is currently increased with the interested topic in a research domain and an engineering methodology. The studies of EHW generally use the XC6200 of Xilinx. The structure of XC6200 can configure with gate unit. Each unit has connected up, down, right and left cell. But the products can't use because had sterilized. So this paper uses Vertex-E (XCV2000E). The cell of FPGA is made up of Configuration Logic Block (CLB) and can't reconfigure with gate unit. This paper uses Vertex-E is composed of the component as cell of XC6200 cell in VertexE

• Journal of the Korean Chemical Society
• /
• v.61 no.6
• /
• pp.339-345
• /
• 2017

Carbonaceous adsorbent (CA-WTP) was prepared by heat treatment at $400^{\circ}C$ for 2 h in N2 atmosphere using waste tire powder (WTP). WTP and CA-WTP were first characterized by thermo-gravimetric analysis (TGA), energy dispersive X-ray spectrometer (EDS), scanning electron microscopy (SEM), specific surface area analysis (BET) and FT-IR spectroscopy. Then, they were tested as adsorbents for removal of Cd in water. CA-WTP exhibited much higher specific surface area and total pore volume than WTP itself and showed higher adsorption capacity for Cd. Equilibrium data of adsorption were analyzed using Freundlich and Langmuir isotherm models. It was seen that both Freundlich and Langmuir isotherms have correlation coefficient $R^2$ value larger than 0.95. The results of studies indicate that CA-WTP developed from WTP by heat treatment could be used as efficient adsorbent for the removal Cd from water.

• Journal of Digital Contents Society
• /
• v.15 no.5
• /
• pp.651-661
• /
• 2014

The complexity to search a specific content over TV platform is drastically increasing. Based on previous studies from computer data management system, we propose a new method that helps users to search and select content effectively. In general, contents over computers are represented by spatial metaphor, which replicates our physical environment and value systems about space. We suggest 3D lattice structure to construct information space for TV platform. Users can infer relevance between contents via special clue in information space, so as to select content more easily. Also, they can search contents through its temporal property that also represented in space. We make full use of our natural capability that can reduce additional overload to learning new interface. The results of this study can be significant and heuristic contributions, as they can be applied to diverse service areas utilizing video contents.

• Journal of Digital Contents Society
• /
• v.14 no.1
• /
• pp.41-50
• /
• 2013

Social network analysis use the n nodes with l connections. About dozens or hundreds number of nodes are reasonable for social network analysis to the entire data. Beyond such number of nodes it will be difficult to analyze entire data. Therefore, it is necessary to separate the whole social networks, a method that can be used at this time is Clustering. You will be able to easily perform the analysis of the features of social networks and the relationships between nodes, if sub-group consists of all the nodes by Clustering. Clustering algorithm needs the interaction with the user and computer because it is need to pre-set the number of sub-groups. Sub-groups generated like this can not be guaranteed optimal results. In this paper, we propose dynamic sub-groups creating method using the external community association. We compared with previous studies by the number of sub-groups and sub-groups purity standards. Experimental results show the excellence of the proposed method.

• Journal of Digital Contents Society
• /
• v.18 no.3
• /
• pp.443-455
• /
• 2017

This study is a follow-up study of Smart-phone Application Content Development for the Measurement and Management of Adolescents' Depression(J. S. Park et al., 2016), that designing and implementing a smart-phone application based on cognitive behavioral therapy. This app facilitates analysis of depressive symptoms, and a simple, continuous self-check. Through this, the app will allow for continuous management of the psychological states by avoiding one-off or comprehensive analysis and diagnosis of depression, unlike previous app. We also aim to make a connection to the practical counseling services. To achieve this goal, we examined not only existing studies on youth depression, but also mobile applications related to depression.

• Journal of the East Asian Society of Dietary Life
• /
• v.6 no.1
• /
• pp.1-16
• /
• 1996

This study was conducted to obtain basic data for reinforcing and developing course programs in department of Food Science and Nutrition. For this purpose, data was collected from dietitians and professors who work at 2-and 4-year colleges. Results are as follows. 1. Many respondents (95.7%) support that It Is desirable to separate dietitian license into two types. Reasons are (1) specific knowledge required by job type is different(29.5%), and (2) to increse job performance (29.3%). 2. Most respondents(95.4%) agree that course programs are needed to be revised. Because (1) current programs are inadequate to provide specific knowledge required at field work (67.8%), and (2) the programs are not helpful to increase job performance of dietitians (54.1%). 3. Respondents of dietitians want to extend applied science area(37.7%) and reinforce lab training (63.1%), as principles of program revision. 4. Course titles which need to be reinforced are Internship(95.8%) and Lap training(67.8%). 5. Specialized areas which need to be reinforced are Food Service Managemant and Practical Training(90.9%), Nutrition Education and Guide(88.9%), Public Health Nutrition(79.0%), Basic Area for Clinics(85.6%), Basic area for Education and Counselling(87.1%), and Cooking Science(77.5%) 6. Courses which are needed to be reinforced by respondents(over 75% agree) are Computer Management for Food Service, Counselling, Nutrition and Disease, Diet Therapy, Quantity Cooking, Internship, Public Health (Health Care), Community Nutrition(Environment and Nutrition), Clinical Nutrition, Psychology, and Communication.