국제 환경 논의를 통한 우리 나라의 환경정책 추진 방향에 관한 연구

황상호,조재립 한국산업경영시스템학회 2000 한국산업경영시스템학회 학술대회 Vol.2000 No.추계

소규모 그룹에서의 음성 통신을 위한 TDMA 기반의 릴레이 프로토콜

황상호,박창현,안병철 한국인터넷방송통신학회 2013 한국인터넷방송통신학회 논문지 Vol.13 No.1

근거리 무선 통신은 전송 거리에 제약이 있어 마스터 주변의 노드만이 통신이 가능하다. 기존의 블루투스와 지그비와 같은 통신은 ad hoc을 위한 기술을 제공함에도 불구하고 실시간 대화를 위한 멀티 홉 전송에는 적절하지 못하다. 본 논문은 TDMA을 이용하여 소규모의 여러 사용자들이 서로 대화할 수 있는 릴레이 프로토콜을 제안한다. 제안한 릴레이 프로토콜은 TDMA를 이용하여 실시간으로 데이터 또는 음성의 다중 홉 재전송이 가능하다. 제안하는 프로토콜은 라우팅 경로에 따라 주파수를 달리하여 패킷을 전송하는 방법으로 이동에 따른 채널 효율의 감소를 줄여 네트워크의 성능을 높이고 있다. NS-2 시뮬레이션을 통하여 제안한 프로토콜이 실시간 음성 전달에서 전송 지연과 패킷 손실률에 있어 우수한 성능을 가지고 있음을 보인다. Since the wireless communications have a limited transmission, the devices just around a master node can exchange data. Though Bluetooth and Zigbee support ad hoc, they are not appropriate for real-time voice communications. In this paper, we present a TDMA-based relay protocol for several users to communicate simultaneously. The proposed protocol can relay data or voice to other nodes in real-time by the multi-hop transmission method using TDMA. And the proposed protocol improves the network performance by allocating different frequencies to the slaves depending on the routing path scheduled by the routing table. NS-2 simulation shows that the performance of the proposed protocol is good in terms of the transmission delay and pecket loss probability in the real-time voice transmission.

뉴-라운드를 고려한 ISO 14000시스템 구축에 관한 연구

황상호,조재립 경희대학교 산학협력기술연구원 2000 산학협력기술연구논문집 Vol.6 No.-

After the failure of the WTO talks in Seattle, the European Union and the United States are likely to become increasingly protective, making it important to bolster competitiveness in all sectors in order to survive globalization. Korea will have to prepare for the changes in the international economic environment. New trade issues - Environment, Labor, Investment, Competitive Policy, E-Commerce...- stand out in bold relief. Like our country that depend on exports for their economic growth, this nation has not given up hope on the need for the liberalizing international trade rules. Surely, some hypothetical case studies must be designed as preparatory training for bankers, major corporations government officials. Sectors with low competitiveness must try to find ways to boost it. Trade friction in the auto, steel, pharmaceutical and ship building industries can be reduced by softening domestic regulations. Challenges lie ahead for Korea in New Round. The primary objective this study is to provide the basis of environmental quality management policies by reviewing previous studies on ISO 14000 and its case studies.

우리나라 속도관리전략 개발에 관한 연구

황상호 경찰대학교 2005 경찰학연구 Vol.0 No.8

Speed management is not necessarily about reducing speed, but to a considerable extent about planning and designing the road layout and the road network in such a way that an appropriate speed is obtained. The main objective of this report was to develop recommendations for speed management strategies in our country. Safety researches related to speed was reviewed on the basis of literature studies. Also, spot speed characteristics by several road type was analyzed and speed management methods in several country are described briefly. Outlines of speed management in our country are on eliminating over speeding drivers, reducing average running speed and standard deviation, and mitigating the stop and go conditions. For this, five main strategies are recommended, that is, speed management plan for road user, consistent speed management by road types, acceptance of various traffic calming techniques, improvement driver’s awareness for speeding, and advancement of enforcement techniques. For more refined strategies, comprehensive road safety research related to speed is to be need, including speed-safety relationships, factors affecting drivers’choice of speed and development of and engineering and enforcement measures to manage speed. And an inter-agency speed management team to work on this safety issue to be review, like USA and Canada.

Adaptive Writeback-aware Cache Management Policy for Lifetime Extension of Non-volatile Memory

황상호,최주희,곽종욱 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.4

In this paper, we propose Adaptive Writeback-aware Cache management (AWC) to prolong the lifetime of non-volatile main memory systems by reducing the number of writebacks. The last-level cache in AWC is partitioned into Least Recently Used (LRU) segment and LRU using Dirty block Precedence (DP-LRU) segment. The DP-LRU segment evicts clean blocks first for giving reuse opportunity to dirty blocks. AWC can also determine the efficient size of DP-LRU segment for reducing the number of writebacks according to memory access patterns of programs. In the performance evaluation, we showed that AWC reduced the number of writebacks up to 29% and 46%, and saved the energy of a main memory system up to 23% and 49% in a single-core and multi-core, respectively. AWC also reduced the runtime by 1.5% and 3.2% on average compared to previous cache managements for non-volatile main memory systems, in a single-core and a multi-core, respectively.

반복적인 3차원 공간상의 회전운동이 전정안반사에 미치는 영향에 관한 연구

황상호,김근수 대한평형의학회 2010 Research in Vestibular Science Vol.9 No.4

Background and Objectives: The parameters of vestibulo-ocular reflex (VOR) are believed to indicate the quantitative value of vestibular function and the differences in them are related to the susceptibility of motion sickness. The purpose of this study was to investigate the effects of repetitive multiaxial 3-dimensional rotation training on VOR parameters. Materials and Methods: Fifteen healthy volunteers were randomly assigned to 3 different groups according to the mode of exercise training. Aerotrim exercise was done as a method of repetitive multiaxial 3-dimensional rotation training. The changes in VOR parameters after 9 weeks of exercise training in Aerotrim training group were compared with that of other groups. Results: While the values of VOR gain in Aerotrim training group after 9 weeks of exercise training were significantly lower than baseline values at rotation frequencies of 0.01, 0.04,0.08, 0.16, and 0.32 Hz, values of VOR gain in other groups showed no difference between before and after exercise training. In all groups, there were no significant differences in VOR phase and symmetry values between before and after exercise training. Conclusion: This study showed that VOR parameters changed after 9weeks of repetitive multiaxial 3-dimensional rotation training, and vestibular habituation might eventually occur. Since vestibular habituation is known to contribute to mitigating the frequency and the degree of motion sickness, we suggest that repetitive multiaxial 3-dimensional rotation training can be used as the countermeasure for student pilots or astronauts, who are often exposed to unusual motion and positional status in actual 3-dimensional space.

柴朴湯및 八味地黃湯이 Puromycin Amininucleoside 로 誘發된 白鼠의 腎症에 미치는 影響

황상호,안영민,안세영,두호경 대한한방내과학회 2002 大韓韓方內科學會誌 Vol.23 No.3

ERP와 DW통합

황상호,Hwang, Sang-Ho 한국데이터베이스진흥원 1999 디지털콘텐츠 Vol.5 No.-

ERP데이터는 조직의 비즈니스 과정상 중요한 것을 담고 있다. 다름 아닌 고객들에 대한 정보, 경쟁환경, 주요 경쟁상대, 그리고 얼마나 효과적으로 자원의 조직화가 이루어졌는가 하는 것들이다. 이러한 데이터를 이용해 유용한 정보를 찾아 낼 수 있다면 무한경쟁 환경 속에서 비교우위를 갖게 되는 것이다. 이러한 관점에서 ERP와 DW 연계는 향후IT 업계의 이슈라 할 수 있다.

보염기 형상이 연료액적분포와 연소특성에 미치는 영향

황상호,김경모,권형정 한국기계기술학회 2006 한국기계기술학회지 Vol.8 No.4

낸드 플래시 메모리의 이주 오버헤드 감소 및 수명연장을 위한 가비지 컬렉션 기법

황상호,곽종욱,Hwang, Sang-Ho,Kwak, Jong Wook 대한임베디드공학회 2016 대한임베디드공학회논문지 Vol.11 No.2

NAND flash memory has unique characteristics like as 'out-place-update' and limited lifetime compared with traditional storage systems. According to out-of-place update scheme, a number of invalid (or called dead) pages can be generated. In this case, garbage collection is needed to reclaim invalid pages. Because garbage collection results in not only erase operations but also copy operations of valid (or called live) pages to other blocks, many garbage collection techniques have proposed to reduce the overhead and to increase the lifetime of NAND Flash systems. This techniques sometimes select victim blocks including cold data for the wear leveling. However, most of them overlook the cost of selecting victim blocks including cold data. In this paper, we propose a garbage collection technique named CAPi (Cost Age with Proportion of invalid pages). Considering the additional overhead of what to select victim blocks including cold data, CAPi improves the response time in garbage collection and increase the lifetime in memory systems. Additionally, the proposed scheme also improves the efficiency of garbage collection by separating cold data from hot data in valid pages. In experimental evaluation, we showed that CAPi yields up to, at maximum, 73% improvement in lifetime compared with existing garbage collections.