• Journal of the Korea Institute of Information Security & Cryptology
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• v.16 no.2
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• pp.13-24
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• 2006

We consider a privacy-preserving cooperative computation protocol evaluating a beneficial function of all participants' secret inputs, such that each party finally holds a share of the function output. We propose a practical privacy-preserving cooperative computation protocol for solving the linear system of equations problem md the linear least-squares problem. Solutions to these problems are widely used in many areas such as banking, manufacturing, and telecommunications. Our multi-party protocol is an efficiently extended version of the previous two-party model.

• Journal of Arbitration Studies
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• v.9 no.1
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• pp.139-160
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• 1999

International commercial arbitrations have developed into a simple form in which both parties involved in the dispute by a contract intend to solve the dispute through the legal arbitration system. however nowadays the above traditional form taken by international projects are rarely seen and instead the form of complex arbitration in which many parties are involved has become more and more universal. The complex arbitration means not only many-sided parties concerned but also means a plural number of contract involved in conflicts, a plural number of issues involved in conflicts and a plural number of contracts though their contractors are not in a plural number. However in this report the complex arbitrations will be studied into categories as follows : 1. Pure multi-issue situations, 2. Pure multi-party situations, 3. Pure multi-contract situations. A Pure Multi-Issue arbitration basically includes a plural number of claims between the two parties concerned. A Pure Multi-party case classically presupposes an arbitration clause which involves a plural number of parties concerned. After Party A takes a legal proceeding and then Party B institutes a request to Party C in the above proceeding. In that case the problem arises on whether it is allowed to do so or not. A Pure Multi-Contract case presupposes that when Party A and Party B have independent arbitration clauses based on separate contract relations, respectively, the problem is whether both above-mentioned proceedings can be unified into one or not. As for the above-mentioned complex arbitration, though international treaties are being formed, including the WTO treaties, the NAFTA treaties, the Mercosur treaties and others, legal regulations and customs have not yet been formed domestically. The institutional preparations will be necessitated in consideration of national legal status as well as international treaty relations.

• Korean Journal of Legislative Studies
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• v.27 no.3
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• pp.69-106
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• 2021

This paper aims to explain why severe political conflicts and confrontation between the ruling and opposition forces have been continuously caused, focusing on the institutional combination of presidentialism and the two-party system with strong party disciplines, after democratization in South Korea. And this also presents the US as a case in which presidentialism and a two-party system with weak party disciplines were combined once, and the Chile as another case in which presidentialism and a multi-party system with strong party disciplines is combined, respectively, and further analyzes how the chance of consensual politics could be raised in both the countries. In addition, this study suggests a practical implication that, in South Korea also, the political reforms for changes in party system such as the decentralization or democratization in party organizations to enhance the autonomy of individual legislators, or the introduction of runoff system in presidential elections or proportional representation system in parliamentary elections to product a multi-party system, are required for a high chance of consensual politics.

• Korean Journal of Legislative Studies
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• v.26 no.2
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• pp.5-33
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• 2020

Ahead of the 21st Korean National Assembly Election, the congressional election law was revised, and the semi-mixed member proportional system was introduced. The purpose of the revision of the election law was to increase the proportionality and representativeness of the election system through the institutional reform in the direction of promoting a multi-party system. This study shows that the effect of the introduction of the semi-mixed proportional system was compared with the election results when the previous proportional representative system was maintained. There was no significant difference from the results. This study reveals that contrary to the intention of institutional design to revitalize the multi-party system, the two large political parties took the most seats after democratization in 1987, resulting in an unintended consequences. In addition, with regard to the recent argument for party realignment, the Busan, Ulsan, and Gyeongnam regions have been dealigned in the Yeongnam regional cleavage, and are undergoing a process of party realignment. It has not yet entered the stage of realignment, but remains in the stage of fluid dealignment.

• Journal of Contemporary Eastern Asia
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• v.13 no.2
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• pp.57-68
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• 2014

How do party organizations respond to newly evolving social groups? Research on Indian party organizations reveals that in multiethnic societies with uneven modernization between social groups, internally competitive parties respond better to newly evolving groups. Moreover, it is claimed: the same dynamic works vis-$\grave{a}$-vis homogenous societies with cleavages based on economic differences; and, the pattern holds regardless of differences in electoral institutions. This study examines these claims by testing whether factional competition correlated with recruitment into Japan's Liberal Democratic Party in 1972 and 1983. Japan had a single-nontransferable-vote system with multi-member districts, while the research on India assumes a first-past-the-post system with single-member districts. This study conducts a difference of means test on the population of new and old politicians in the LDP in 1972 and 1983 with a pooled variance adjustment to account for differences in populations' size. The findings show that intra-party competition and recruitment are not correlated in Japan, thus tentatively rejecting both claims.

• Korean Journal of Legislative Studies
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• v.24 no.1
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• pp.103-133
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• 2018

This paper examines whether the budget making process has improved since the Automatic Submission of Budget Bills to Plenary Session Act was enacted. The budget bill was passed before the Dec. 2 deadline from 2014 to 2016. Several researchers, therefore, concluded that the clause is in favor of the ruling party and the majority party. However, this study confirmed that the argument is valid only under the condition of unified government. In other cases, the government party can have a limited impact on the budget-review process, and the aspects of the budget screening process are similar to those before the Act was enforced. Under the conditions of the divided government and two-party system, it is difficult that the budget bill is passed by the legal deadline. In the case of the divided government and multi-party system without majority party, the third party exerts a very significant influence on the budget-review process.

• The Journal of the Korea Contents Association
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• v.5 no.2
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• pp.257-266
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• 2005

As developing of the internet and computer technology, more interests are gathered to the conference service which provides capability of multi-party real-time visual conference. In this paper, we have designed and implemented a SIP-based visual conference system which includes Presence service. The elements of this conference system are user system, which has conference UA(User Agent) capability, presence seuer and conference server. For the presence service, we have adapted publication method which uses SIP PUBLISH message, and with this service various status informations of users are easily acquired. Also invitations and involvements to the conference are easily made through this service. For the conference server which controls establishment and management of multi-party connections, we have included conference event package. This package provides dynamically changing conference informations and users informations through SIP subscription and notification functions.

• Management Science and Financial Engineering
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• v.4 no.2
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• pp.15-42
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• 1998

A joint problem of order delivery, setup reduction, and cost-sharing in a two-echelon inventory system in which a vendor supplies multiple products to a group of buyers is studied here. The basic premise is that buyers have independently implemented setup reduction programs to acquire benefits from small order sizes. Doing so, however, causes the buyers' individually optimal order cycles to be differ from that of the vendor. In conjunction with this, two models are considered. In the first model, a multi-buyers single product situation is considered in which the vendor implements a joint supply cycle policy. However, buyers, as the dominant party, insist after implementing the individually optimal setup reduction that the vendor accept their individually optimal order schedules. In the second model. a multi-products, single buyer situation is considered in which the buyer implements a joint order policy. Here, the vendor, as the dominant party, refuses to cooperate fully with the buyer's individually reduced joint order schedule, and designs his own individually optimal setup reduction mix for each product under a given budget constraint. This led to a study of an integrated Setup Reduction/Break-even Pricing Policy for each situation to eliminate mismatches in individually optimal cycle times.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.10B
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• pp.630-638
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• 2005

As real-time media applications based on IP multicast networks spread widely, the end-to-end QoS (quality of service) provisioning for these applications have become very important. To guarantee the end-to-end QoS of multi-party media applications, it is essential to monitor the time-varying status of both network metrics (i.e., delay, jitter and loss) and system metrics (i.e., CPU and memory utilization). In this paper, targeting the multicast-enabled AG (Access Grid) group collaboration tool based on multi-Party real-time media services, a hybrid monitoring scheme that can monitor the status of both multicast network and node system is investigated. It combines active monitoring and passive monitoring approaches to measure multicast network. The active monitoring measures network-layer metrics (i.e., network condition) with probe packets while the passive monitoring checks application-layer metrics (i.e., user traffic condition by analyzing RTCP packets). In addition, it measures node system metrics from system API. By comparing these hybrid results, we attempt to pinpoint the causes of performance degradation and explore corresponding reactions to improve the end-to-end performance. The experimental results show that the proposed hybrid monitoring can provide useful information to coordinate the performance improvement of multi-party real-time media applications.

• The Journal of the Convergence on Culture Technology
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• v.9 no.3
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• pp.647-654
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• 2023

Deep Learning is a useful method for classifying and recognizing complex data such as images and text, and the accuracy of the deep learning method is the basis for making artificial intelligence-based services on the Internet useful. However, the vast amount of user da vita used for training in deep learning has led to privacy violation problems, and it is worried that companies that have collected personal and sensitive data of users, such as photographs and voices, own the data indefinitely. Users cannot delete their data and cannot limit the purpose of use. For example, data owners such as medical institutions that want to apply deep learning technology to patients' medical records cannot share patient data because of privacy and confidentiality issues, making it difficult to benefit from deep learning technology. In this paper, we have designed a privacy preservation technique-applied deep learning technique that allows multiple workers to use a neural network model jointly, without sharing input datasets, in multi-party system. We proposed a method that can selectively share small subsets using an optimization algorithm based on modified stochastic gradient descent, confirming that it could facilitate training with increased learning accuracy while protecting private information.