• 한국환경과학회지
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• 제15권4호
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• pp.349-357
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• 2006

The purpose of this study is to evaluate the water pollution degree in the Mid-Nakdong River watershed regarding to landcover types using GIS method. As a result of landcover classification, rate of urban appeared highly on Daegu Metropolitan city. Also, rate of agriculture showed highly in the riparian zones of the Nakdong and Guemho River and rate of forest appeared highly in the borders of the study area. To identify the groups of watershed with similar landcover patterns using the Cluster Analysis. According to the cluster analysis, the fifty sub-watersheds were grouped in three clusters, 'Urban watershed', 'Agriculture watershed', 'Forest watershed'. The proportion of urban area in each cluster had a positive correlation with water pollution degree. Otherwise, the proportion of agriculture in the Agriculture watershed had a high positive correlation with water pollution degree. Therefore, it is necessary to estimate environmental capacity of water duality considering ecological and environmental characteristics of watershed ecosystem and expand water duality monitoring systems to small stream.

• The Journal of Asian Finance, Economics and Business
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• 제10권2호
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• pp.163-174
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• 2023

This study aims to investigate the effect of the composition of the board and ownership structure on a firm's value in Jordanian firms. Specifically, it aims to determine the effect of board size, (CEO) duality, and family, foreign, institutional, and government ownership on a firm's value. An ordinary least square regression (OLS) was employed to examine the study hypotheses in a sample of 35 Jordanian industrial firms (175 firm-year observation) for a period of five years from 2016-2020. As measured by Tobin's Q (Q ratio) and market-to-book (MB ratio) for Jordanian industrial firms listed on Amman Stock Exchange (ASE). The result found that foreign ownership, institutional ownership, and family ownership have a significant and positive effect on firm value. By contrast, government ownership does not have a significant effect on firm value. With respect to board composition (CEO duality and board size), the study results found no evidence to support the effect of board composition on firm value. The study recommended the concerned authorities with several recommendations, most notably: taking the necessary measures to ensure the continuity and growth of family businesses because of their positive impact on the value of the company and economic growth, spreading awareness about how governance protects the interests of investors.

• Journal of Communications and Networks
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• 제11권2호
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• pp.166-174
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• 2009

In this paper, a distributed power and end-to-end rate control algorithm is proposed in the presence of licensed users. By Lagrangian duality theory, the optimal power and rate control solution is given for the unlicensed users while satisfying the interference temperature limits to licensed users. It is obtained that transmitting with either 0 or the maximum node power is the optimal scheme. The synchronous and asynchronous distributed algorithms are proposed to be implemented at the nodes and links. The convergence of the proposed algorithms are proved. Finally, further discussion on the utility-based fairness is provided for the proposed algorithms. Numerical results show that the proposed algorithm can limit the interference to licensed user under a predefined threshold.

• The Journal of Asian Finance, Economics and Business
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• 제9권5호
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• pp.443-453
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• 2022

This study examines the effect of board structure and audit committee structure on financial reporting timeliness among Malaysia's top 100 public listed companies. Specifically, this study examines whether board independence, CEO duality, board ownership, audit committee independence, audit committee competence, and audit committee diligence influence the financial reporting timeliness of the public listed companies. This study selects the top 100 public listed companies by market capitalization listed on the Main Market of Bursa Malaysia as the sample since the main board has more public reprimands on financial reporting timeliness compared to other boards. The content analysis on annual reports for five years from 2015 to 2019 is utilized. The results show that audit committee competence and audit committee diligence significantly affect financial reporting timeliness. In contrast, board independence, CEO duality, board ownership, and audit committee independence have insignificant relationships with financial reporting timeliness. The findings in this study are helpful for compliance analysis and strategy formation in enhancing financial reporting timeliness. This study contributes to the agency theory by providing a new perspective on how different sections of corporate governance features interact together to influence financial reporting timeliness. In addition, the findings can assist the regulators in establishing quality corporate governance.

• 한국콘텐츠학회논문지
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• 제20권9호
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• pp.19-28
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• 2020

<두 개의 사랑>(2017)을 중심으로 쌍둥이 모티브의 욕망, 죽음, 환상이 거울 이미지로 재현되는 방식에 대해서 고찰하고자 한다. 첫째, 쌍둥이 모티브의 욕망은 선/악과 규범/욕망의 이중성을 관능적 유혹의 거울로 표현한다. 둘째, 쌍둥이 모티브의 죽음은 죽음의 전이를 처벌의 거울로 표현한다. 셋째, 쌍둥이 모티브의 환상은 정신적 방어를 파편화된 거울로 표현한다. 이렇듯 <두 개의 사랑>에서 쌍둥이 모티브는 욕망, 죽음, 환상이라는 세 가지 키워드를 중심으로 이중성, 처벌, 분열이라는 세 가지 거울 이미지로 효과적으로 표현하고 있다.

• 한국정보통신학회논문지
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• 제4권2호
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• pp.453-460
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• 2000

본 논문은 도우미가 해주는 서비스보다 빠른 속도로 제공해주는 관광정보 안내시스템을 서술한다. 관광정보 안내시스템은 가고자하는 목적지의 정보, 지도 정보, 스케줄에 따른 관광코스, 교통정보 그리고 숙박정보를 제공한다. 더욱이 사용자를 위하여 터치스크린을 이용하였다. 이 시스템에서 제시한 쌍대성 이론을 이용한 최단경로 구현방식은 시간과 경비를 절약한 여행코스를 제공한다. 사용된 지도는 벡터방식 대신에 라스터 방식을 사용하여 사용자들에게 편리성을 제공하였다. 본 개발된 시스템을 역이나 공항, 버스정류소 등의 공공장소에 설치한다면 여행자들에게 유용한 정보 제공한 것이다. 본 시스템을 설치하는 지역에도 쉽게 적용할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권11호
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• pp.2616-2635
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• 2013

In this paper, we propose an iterative transceiver design in a multi-relay multi-user multiple-input multiple-output (MIMO) system. The design criterion is to minimize sum mean squared error (SMSE) under relay sum power constraint (RSPC) where only local channel state information (CSI)s are available at relays. Local CSI at a relay is defined as the CSI of the channel between BS and the relay in the $1^{st}$ hop link, and the CSI of the channel between the relay and all users in the $2^{nd}$ hop link. Exploiting BS transmitter structure which is concatenated with block diagonalization (BD) precoder, each relay's precoder can be determined using local CSI at the relay. The proposed scheme is based on sequential iteration of two stages; stage 1 determines BS transmitter and relay precoders jointly with SMSE duality, and stage 2 determines user receivers. We verify that the proposed scheme outperforms simple amplify-and-forward (SAF), minimum mean squared error (MMSE) relay, and an existing good scheme of [13] in terms of both SMSE and sum-rate performances.

• 한국통신학회논문지
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• 제24권9A호
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• pp.1434-1441
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• 1999

본 논문에서는 Hairpin Line 여파기의 정확한 해석 및 설계를 위한 등가회로를 제시하였으며 제시된 등가회로의 유효성을 컴퓨터 시뮬레이션과 설계를 통해 입증하였다. Hairpin Line 여파기에 대한 설계식은 다양하게 제시되었으나, 인접하지 않는 소자간의 상호 연결성을 포함한 실제적으로 간단화된 등가회로는 아직 명시되고 있지 못하다. 본 논문에서는 회로 duality을 이용하여 Hairpin Line 여파기 회로의 모든 개방단자를 단락단자로 변환하고, 변환된 회로를 그래프 모델로 표시하였다. 또한 각 단자에서의 경계조건으로부터 보다 간략화된 회로모델을 구하고 역 dual구조로 변환하여 Hairpin Line 여파기에 대한 간단화된 등가회로를 유도하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권8호
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• pp.2722-2742
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• 2014

We propose methods of linear transceiver design for two different power constraints, sum relay power constraint and per relay power constraint, which determine signal processing matrices such as base station (BS) transmitter, relay precoders and user receivers to minimize sum mean square error (SMSE) for multi-relay multi-user (MRMU) networks. However, since the formulated problem is non-convex one which is hard to be solved, we suboptimally solve the problems by defining convex subproblems with some fixed variables. We adopt iterative sequential designs of which each iteration stage corresponds to each subproblem. Karush-Kuhn-Tucker (KKT) theorem and SMSE duality are employed as specific methods to solve subproblems. The numerical results verify that the proposed methods provide comparable performance to that of a full relay cooperation bound (FRCB) method while outperforming the simple amplify-and-forward (SAF) and minimum mean square error (MMSE) relaying in terms of not only SMSE, but also the sum rate.

• 한국통신학회논문지
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• 제33권1C호
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• pp.140-148
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• 2008

타입 II ONB(optimal normal basis)의 자기쌍대성(self duality)을 이용하여 낮은 하드웨어 복잡도와 작은 지연시간을 가지는 GF($2^m$)상의 비트 패러럴, 시리얼 시스톨릭 어레이를 제안하였다. 제안된 곱셈기는 m+1의 지연시간을 가지며 각 셀은 5개의 래치(플립-플롭)로 구성된다. 제안된 어레이는 다른 어레이와 비교하여 공간 복잡도와 지연시간을 줄임을 알 수 있다.