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양식어장 보호를 위한 원격감시시스템의 구축방안에 관한 연구
김철승,정중식,박성현,Kim, Chul-Seung,Jeong, Jung-Sik,Park, Sung-Hyeon 해양환경안전학회 2004 海洋環境安全學會誌 Vol.10 No.2
국민소득 증가에 따라 고급해산물의 수요가 늘어나고 있으며, 어패류 및 해조류를 포함하는 양식어업은 국내어업에 대한 총수입중 $50.6\%$를 차지하고 있는 어가의 주 소득원 중의 하나이다. 최근 국내어장에서 불규칙하게 발생하는 어패류 도난사건의 피해액은 매년 건당 수십만에서 수천만원 이상으로 증가하고 있는 실정이다. 본 연구에서는 국내 영세어가에 적용할 수 있는 양식어장 보호를 위한 레이더 감시시스템의 모델을 제안하고, 시스템의 구축방안을 제시하였다. 국외에서 양식어장보호 감시시스템이 개발된 바가 있지만 구축비용이 고가이므로 국내 영세어가에 적용하기에는 어렵다. As GNP increases, many peoples need the seafood with high quality. In Korea, aquaculture is one of major incomes for fishing households and records $50.6\%$ of total incomes for domestic fishery. The loss of aquaculture farm due to thievery at sea increases every year. In this research, we propose the system model for development of radar surveillance system, which protects aquaculture farms. For the proposed system, general requirements are described Our system is cost-effective when it is applied to domestic fishing households.
김철승 ( Chul Seung Kim ),박상묵 ( Sang Muk Park ) 대한임상검사과학회 2008 대한임상검사과학회지(KJCLS) Vol.40 No.1
Benign paroxysmal positional vertigo (BPPV) is one of the most common clinical entities encountered in a dizzness clinic. Retrosepective review was performed for the patient’s diagnosed as BPPV at Sunchon “S” hospital dizzness center. Variables for statistical analysis included age, sex, involved canal presence of recent head tramua, presence of chronic otitis media, history of middle ear surgery, underlying disease such as hypertension or diabetics, headache, central lesion. From July 2004 to May 2005, we sampled the 600 dizzness patient``s who visited the dizzness center. Dizzness could be classified into BPPV, vestibulopathy. Among these patients, 256 patients had BPPV, 222 patients had vesibulopathy and 97 patients had Normal. Among these BPPV patients, 80 patients had lateral canalolithiasis BPPV (31.3%), 28 patients had lateral cupulolithiasis BPPV (10.9%), 90 patients had posterior canalolithiasis BPPV (35.2%), 7 patients had multicanalolithiasis BPPV (2.3%), 52 patients simultaneously had BPPV, other vestibular disease, and central lesion (20.3%).
만성 요통 및 하지방사통 환자에서 감압치료(KNX $7000^{(R)}$)와 견인치료의 단기 치료 효과
박소현,김철승,이동규,안상호,Park, So-Hyun,Kim, Chul-Seoung,Lee, Dong-Gyu,Ahn, Sang-Ho 대한물리치료학회 2011 대한물리치료학회지 Vol.23 No.5
Purpose: The purpose of this study is to evaluate the short term effects of the traction and decompression device, which is a newly developed domestic medical device, on pain and functional activity in patients with chronic low back pain with or without radicular pain. Methods: Forty patients with chronic low back pain were included and allocated to decompression (n=20) and traction groups (n=20). They received decompression or traction therapy for 20 minutes a day, 3 days per week for two weeks. For evaluating pain and functional activity, a visual analogue scale (VAS) for low back pain and the Oswestry back pain disability index (ODI) were obtained on pre-treatment, and at 6, 12 and 15 days after treatment. Patients'satisfaction levels were measured 15 days after treatment. Results: VAS was significantly decreased at 12 days and 15 days post-treatment compared to pre-treatment in both groups (p<0.05). ODI was significantly decreased at 12 days and 15 days post-treatment compared to pre-treatment in the decompression group (p<0.05). However, there was no significant difference between the two groups in the VAS and ODI scales (p>0.05). Patients' satisfaction levels were significantly higher in the decompression group than in the traction group (p<0.05). Conclusion: These findings suggest that decompression therapy might be effective for increasing functional activity in patients with low back pain and could provide patients with higher satisfaction than traction therapy. This study provided validity data for the therapeutic effects of the decompression device in patients with low back pain and it will be useful for medical cost development and patient education of this device.
MIMO 채널에서 LLR 추정을 위한 저 계산량 알고리즘
박태두,김민혁,김철승,정지원,Park, Tae-Doo,Kim, Min-Hyuk,Kim, Chul-Sung,Jung, Ji-Won 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.12
차세대 무선통신에서는 다양한 서비스, 높은 신뢰도와 함께 빠른 전송속도를 요구한다. 이러한 요구를 만족시키기 위해서 MIMO 시스템과 LDPC 부호를 결합하는 방법에 대한 많은 연구가 이루어지고 있다. MIMO 시스템과 LDPC 부호의 결합시 LDPC 복호기에는 각 채널에서 수신되는 정보를 이용하여 연판정된 비트를 LDPC 복호기에 입력되어야 한다. 기존의 방식은 모든 수신된 신호를 이용하여 연판정된 비트를 분리하여 많은 계산량이 필요로 하는데, 본 논문에서는 후보 벡터를 이용하여 성능의 감소없이 연판정된 비트를 분리하여 최대 61%의 계산량을 감소하는 방식을 제시하였다. In recent years, the goal of providing high speed wireless data services has generated a great amount of interest among the research community. Several researchers have shown that the capacity of the system, in the presence of flat Rayleigh fading, improves significantly with the use of combined MIMO and LDPC. To feed the soft values to LDPC decoder, the soft values must be calculated from multiple transmitter and receiver antennas in Rayleigh fading channel. It requires high computational complexity to get the soft symbols by increasing number of transmitter and receiver antennas. Therefore, this thesis proposed on effective algorithm for calculation of soft values from multiple antennas based on LLR. As result, This thesis shows that maximum 61% of computational complexity is reduced with a little loss of performance.
유상록,박영수,정중식,김철승,정재용,Yoo, Sang-Rok,Park, Young-Soo,Jeong, Jung-Sik,Kim, Chul-Seong,Jeong, Jae-Yong 해양환경안전학회 2013 해양환경안전학회지 Vol.19 No.6
In this study, time series analysis was tried, which is widely applied to demand forecast of diverse fields such as finance, economy, trade, and so on, different from previous regression analysis. Future marine traffic volume was forecasted on the basis of data of the number of ships entering Incheon port from January 1996 to June 2013, through courses of stationarity verification, model identification, coefficient estimation, and diagnostic checking. As a result of prediction January 2014 to December 2015, February has less traffic volume than other months, but January has more traffic volume than other months. Also, it was found out that Incheon port was more proper to ARIMA model than exponential smoothing method and there was a difference of monthly traffic volume according to seasons. The study has a meaning in that future traffic volume was forecasted per month with time series model. Also, it is judged that forecast of future marine traffic volume through time series model will be the more suitable model than prediction of marine traffic volume with previous regression analysis. 본 연구는 기존의 회귀분석과는 달리 금융, 경제, 무역 등 다양한 분야의 수요 예측에 널리 적용되고 있는 시계열 분석 방법을 시도하였다. 인천항의 1996년 1월부터 2013년 6월까지 입항 척수 자료를 바탕으로 정상성 검증, 모형의 식별, 모수의 추정, 진단 과정을 거쳐 장래 해상교통량을 예측하였다. 2014년 1월부터 2015년 12월까지 예측한 결과 2월달의 교통량이 다른 달 보다 적게 예측된 반면, 1월달의 교통량은 다른 달 보다 많을 것으로 나타났다. 또한 인천항은 지수평활법 보다 ARIMA 모형이 적합하며, 계절에 따라 월별 교통량의 차이를 보이는 것을 알 수 있다. 본 연구는 시계열 분석으로 장래 교통량을 월별로 예측하였다는 점에서 의의가 있다. 또한 기존의 회귀분석으로 예측한 장래 해상교통량보다 시계열 분석으로 예측한 장래 해상교통량이 더 적합한 모형인 것으로 판단된다.
Pore Flow Model에 의한 투과증발기구의 해석에 관한 연구
김윤식,김철승,이승무 연세대학교 산업기술연구소 1994 논문집 Vol.26 No.1
A study was carried out on the separation of water-ethanol mixtures by pervaporation using cellulose acetate membrance. The experimental data were further analyzed by using a transport theory developed on the basis of the pore flow mechanism. The experimental result for pure liquid is well coresponded to calculated one by pore flow mechanism. But due to interactions and coupling effects between permeats and membrance, difference is existed between experimental and calculated results for mixture. In pervaporation of single component, the total permeate flux decreased with an increase of permeate pressure and increased with an increase of temperature. The experimental permeate flux with permeate pressure was well fitted with calculated one by pore flow model. The activation was 11.714 KJ/mol for water, 1,508 KJ/mol for ethanol. For the mixture, the total permeate flux increased with an increase of temperature and decreased with an increase of feed ethanol mole fraction. However, there are considerable difference between experimental and calculated one due to interactions and coupling.