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RISS 인기검색어
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- 저자 : 권영호(Kwon Yong Ho) (검색결과 27 건)
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권영호,서정관,박상원,양상용,Kwon, Young-Ho,Seo, Jung-Kwan,Park, Sang-Won,Yang, Sang-Yong 한국조류학회(藻類) 2006 ALGAE Vol.21 No.2
For the test organism of algal growth potential (AGP), the diatom in the genus Stephanodiscus which cause blooms in the Nakdong River was used instead of generally used strains of Selenastrum, Microcystis, or Anabaena. AGP results indicated that all the samples in the Nakdong River except for that from the Nakdan Bridge site were eutrophic state. Furthermore, the sample from Kumho River site was hypertrophic state. In the main stream Nakdong River, the value of AGP was lowest at the upstream Nakdan Bridge site and was highest at Koryoung Bridge site which is just downstream of Kumho River confluent point indicating the seriousness of pollution contributed by the Kumho River to the Nakdong River. Changes in the concentration of nutrients before and after the AGP tests and inter-relationship among the nutrients indicated that the growth of the Stephanodiscus in the AGP tests were mostly affected by the nitrate, silicate and phosphate. The limiting nutrient was identified by the nutrient addition experiments and the results showed that phosphate was the limiting nutrient for the growth of Stephanodiscus in the tested samples.
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802.11p 기반 다중 라디오 다중채널 네트워크 환경에서 안전 메시지 전송을 위한 내쉬 협상 해법을 이용한 채널할당
권영호 ( Yong-ho Kwon ),이병호 ( Byung-ho Rhee ) 한국인터넷정보학회 2014 인터넷정보학회논문지 Vol.15 No.3
For the safety messages in IEEE 802.11p vehicles network environment(WAVE), strict periodic beacon broadcasting requires status advertisement to assist the driver for safety. WAVE standards apply multiple radios and multiple channels to provide open public road safety services and improve the comfort and efficiency of driving. Although WAVE standards have been proposed multi-channel multi-radio, the standards neither consider the WAVE multi-radio environment nor its effect on the beacon broadcasting. Most of beacon broadcasting is designed to be delivered on only one physical device and one control channel by the WAVE standard. also conflict-free channel assignment of the fewest channels to a given set of radio nodes without causing collision is NP-hard, even with the knowledge of the network topology and all nodes have the same transmission radio. Based on the latest standard IEEE 802.11p and IEEE 1609.4, this paper proposes an interference aware-based channel assignment algorithm with Nash bargaining solution that minimizes interference and increases throughput with wireless mesh network, which is deigned for multi-radio multi-cahnnel structure of WAVE. The proposed algorithm is validated against numerical simulation results and results show that our proposed algorithm is improvements on 8 channels with 3 radios compared to Tabu and random channel allocation algorithm.
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김용(Yong Kim),이호기(Hoki Lee),권영호(Young-ho Kwon) 한국산학기술학회 2025 한국산학기술학회논문지 Vol.26 No.4
When the turret of a self-propelled howitzer rotates, it poses a significant risk to the driver exposed at the front. The Republic of Korea Armed Forces has implemented safety devices to mitigate this danger and protect the driver in major self-propelled howitzers. In the case of the K55A1 self-propelled howitzer, when the turret operates within the driver's danger zone, a specification indicator provides a visual warning, while the driver perceives the risk through an auditory warning transmitted via their helmet. An analysis of the currently applied safety devices reveals certain limitations. Visually, a warning window is displayed on the mission control system for the internal crew, but there is no dedicated warning display inside the driver's compartment. Auditorily, the warning sounds are transmitted through the crew's helmets, but the driver cannot hear the warning sound if the helmet is disconnected or malfunctions. This study focused on the K55A1 self-propelled howitzer and explored the development and trial application of additional auxiliary safety devices to complement the existing driver safety system. These findings are expected to serve as a reference for future technological modifications related to safety improvements.
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산업부산물을 사용한 알칼리 활성 무시멘트 모르타르의 품질특성에 관한 연구
권용훈,권영호,이동규,Kwon, Yong-Hun,Kwon, Yeong-Ho,Lee, Dong-Gyu 한국건설순환자원학회 2013 한국건설순환자원학회 논문집 Vol.1 No.1
산업부산물인 고로슬래그 미분말 및 플라이애시를 적용하였던 선행 연구들과 차별하여 시멘트 킬른 더스트, 실리카퓸, 규사미분말 등의 기타 산업부산물을 사용한 알칼리 활성 무시멘트 모르타르의 품질특성을 검토하고자 하였으며, 그 결과는 다음과 같다. SF 치환의 경우 Plain에 비해 유동성이 저하되었으나 강도발현에는 우수한 경향을 나타내었으며, CKD와 SP의 사용량 증가에 따라 각각 유동성 및 압축강도가 증가하였다. 유동성 증진 및 초기강도 향상에 각 결합재의 고유입도분포와 높은 상관관계를 가지는데, 이는 입자사이즈가 큰 BS 및 FA 입자사이에 입자가 작은 CKD, SF 및 SP가 공극을 충진하여 연속입도곡선을 형성하는 것에 기인한 것으로 사료된다. BS 기반 조기강도 증진용 알칼리 활성 모르타르의 초기강도 향상 및 유동성 개선을 위해서는 고유의 입도분포를 가진 기타 결합재를 치환 사용하는 것이 효과적인 것으로 판단된다. This study investigated quality properties of alkali activated cement free mortar using industrial by-product such as cement kiln dust(CKD), silica fume(SF) and quartz sand powder(SP) to compare with previous research about blast furnace slag(BS) and fly ash(FA). The results were as following. All materials were effective to increase compressive strength, however they showed different tendency on flowability. CKD and SP increased flowability, but on the other hand SF did not because it's blain was great difference with other materials. Flowability and compressive strength were related with grading distributions of binders because CKD, SP and SF which had small particle size filled up BS and FA. Application of industrial by-products with various grading distributions could be effective for the high early strength and flowability of alkali activated cement free mortar using BS.
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Wireless Mesh Network(WMN)에서 우회경로의 Hop 수와 잉여대역폭을 이용하여 개선한 DSDV Routing 기법
이상구 ( Sang Gu Lee ),권영호 ( Yong Ho Kwon ),이병호 ( Byung Ho Rhee ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
기존의 Wireless Mesh Network(WMN)에서 제안된 EFMP DSDV 기법은 우회 경로 이후의 잉여 대역폭이 좋지 않을 경우 우회하지 않았을 때보다 성능이 더 좋지 않은 경우가 발생한다. 이 같은 단점을 보완하기 위하여 본 논문에서는 우회 경로 다음 홉 간의 경로 정보인 Hop수와 잉여대역폭에 대한 정보를 획득하여 수식으로 유도된 Bypass값을 통해 각 우회경로의 비교를 제안한다.
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전자포탈영상을 이용한 기하학적 정도관리 실시간 분석 프로그램의 개발
이상록,정경용,장민선,이병구,권영호,Lee, Sang-Rok,Jung, Kyung-Yong,Jang, Min-Sun,Lee, Byung-Gu,Kwon, Young-Ho 대한방사선치료학회 2012 대한방사선치료학회지 Vol.24 No.2
Purpose: To develop a geometrical quality control real-time analysis program using an electronic portal imaging to replace film evaluation method. Materials and Methods: A geometrical quality control item was established with the Eclipse treatment planning system (Version 8.1, Varian, USA) after the Electronic Portal Imaging Device (EPID) took care of the problems occurring from the fixed substructure of the linear accelerator (CL-iX, Varian, USA). Electronic portal image (single exposure before plan) was created at the treatment room's 4DTC (Version 10.2, Varian, USA) and a beam was irradiated in accordance with each item. The gaining the entire electronic portal imaging at the Off-line review and was evaluated by a self-developed geometrical quality control real-time analysis program. As for evaluation methods, the intra-fraction error was analyzed by executing 5 times in a row under identical conditions and procedures on the same day, and in order to confirm the infer-fraction error, it was executed for 10 days under identical conditions of all procedures and was compared with the film evaluation method using an Iso-align$^{TM}$ quality control device. Measurement and analysis time was measured by sorting the time into from the device setup to data achievement and the time amount after the time until the completion of analysis and the convenience of the users and execution processes were compared. Results: The intra-fraction error values for each average 0.1, 0.2, 0.3, 0.2 mm at light-radiation field coincidence, collimator rotation axis, couch rotation axis and gantry rotation axis. By checking the infer-fraction error through 10 days of continuous quality control, the error values obtained were average 1.7, 1.4, 0.7, 1.1 mm for each item. Also, the measurement times were average 36 minutes, 15 minutes for the film evaluation method and electronic portal imaging system, and the analysis times were average 30 minutes, 22 minutes. Conclusion: When conducting a geometrical quality control using an electronic portal imaging, it was found that it is efficient as a quality control tool. It not only reduces costs through not using films, but also reduces the measurement and analysis time which enhances user convenience and can improve the execution process by leaving out film developing procedures etc. Also, images done with evaluation from the self-developed geometrical quality control real-time analysis program, data processing is capable which supports the storage of information.
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