VHF 대역 통신에 대한 해상풍력 발전단지의 영향성 분석

오성원,박태용 해양환경안전학회 2022 해양환경안전학회지 Vol.28 No.2

As the development of renewable energy expands internationally to cope with global warming and climate change, the share of wind power generation has been gradually increasing. Although wind farms can produce electric power for 24h a day compared to solar power plants, Their interfere with the operation of nearby radars or communication equipment must be analyzed because large-scale wind power turbines are installed. This study analyzed whether a land radio station can receive sufficient signals when a ship sailing outside the offshore wind farm transmits distress signals on the VHF band. Based on the geographic information system digital map around the target area, wind turbine CAD model, and wind farm layout, the area of interest and wind farm were modeled to enable numerical analysis. Among the high frequency analysis techniques suitable for radio wave analysis in a wide area, a dedicated program applying physical optics (PO) and shooting and bouncing ray (SBR) techniques were used. Consequently, the land radio station could receive the electromagnetic field above the threshold of the VHF receiver when a ship outside the offshore wind farm transmitted a distress communication signal. When the line of sight between the ships and the land station are completely blocked, the strength of the received field decreases, but it is still above the threshold. Hence, although a wind farm is a huge complex, a land station can receive the electromagnetic field from the ship’s VHF transmitter because the wave length of the VHF band is sufficiently long to have effects such as diffraction or reflection. 지구 온난화와 기후변화에 대응하기 위해 국제적으로 재생 에너지의 개발이 확대됨에 따라 풍력발전의 비중도 점차 늘어가고 있다. 태양광발전에 비해 24시간 생산이 가능하지만 대형 풍력발전기를 대규모로 설치하기 때문에 주변의 레이더나 통신 장비들의 동작에 간섭을 일으키는 지에 대한 분석이 필요하다. 본 연구에서는 해상풍력 발전단지 외해를 항해하는 선박이 VHF 대역으로 조난 통신을 송신할 경우, 육지의 기지국에서 신호를 수신할 수 있는지를 분석하였다. 대상지역 주변의 수치지형도, 풍력발전기 캐드 모델, 풍력발전단지 배치도를 바탕으로 주변 해역 및 발전단지를 수치해석이 가능하도록 모델링하였다. 광범위한 지역에 대한 전파 분석에 적절한 고주파 해석기법 중 PO, SBR 기법을 적용한 전용 프로그램으로 전자파 간섭 여부를 분석하였다. 해상풍력 발전단지 외곽에서 송신한 VHF 대역 전자파에 대해 육상 기지국에서는 약간의 수신전력 저하는 있지만 기준치 이상의 전력을 수신하였다. 선박과 육상 기지국 사이의 가시선을 완전히 가리는 경우에 수신 전력의 저하가 발생하였으나, VHF대역이 파장이 길어 회절이나 반사 등의 효과로 육상 기지국까지 충분한 전파가 도달하는 것으로 판단된다.

조위승청탕(調胃升淸湯) 추출액이 비만유도 쥐의 지질대사, 항산화계 및 염증반응계에 미치는 영향

오성원,김병우,Oh, Sung-Won,Kim, Byoung-Woo 대한한방내과학회 2013 大韓韓方內科學會誌 Vol.34 No.1

Objectives : The purpose of this study was to investigate the effects of Jowiseungcheung-tang (JWSCT) extract on the lipid metabolism, anti-oxidation and inflammatory reflex. Methods : Male Sprague-Dawley rats were fed a high fat diet for 8 weeks and were randomly divided into 4 groups (10 mice in each group): control group, 100 mg/kg JWSCT group, 200 mg/kg JWSCT group, 300 mg/kg JWSCT group. The control group was administered 100 mg/kg of water, but the other three groups were administered 100, 200, 300 mg/kg JWSCT extract for 4 weeks. After 4 weeks, we measured lipid level, thiobarbituric acid reactive substance (TBARS), glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), catalase (CAT), aspartate aminotransferase (AST), alanine aminotransferase (ALT) and cytokines in plasma and liver. The gene expression level and the ratio of apo-B and apo-E were then investigated by way of reverse transcription -polymerase chain reaction (RT-PCR). Results : In the JWSCT group, compared with the control, free fatty acid, triglyceride, total cholesterol, LDL-cholesterol, TBARS, IL-$1{\beta}$, IL-6 and TNF-${\alpha}$ decreased significantly in plasma and liver. However HDL-cholesterol, IL-10, GSH-Px, SOD and CAT increased. In the JWSCT group, compared with the control, the gene expression level and the ratio of apo-A and apo-E decreased significantly in the RT-PCR analysis. Conclusions : The extract of JWSCT has anti-obesity, anti-inflammatory and anti-oxidant effects.

한국형 타운하우스 설계 사례 -전통적 주거양식을 적용한 주거단지-

오성원,Oh, Seong-Won 한국주거학회 2012 住居 Vol.14 No.-

해상풍력 발전단지에 의한 GMDSS MF/HF 대역 전자파 간섭 영향 연구

오성원,박태용 해양환경안전학회 2021 해양환경안전학회지 Vol.27 No.1

최근 국제적으로 신재생 에너지 개발이 활발함에 따라 풍력발전의 비중이 확대되고 있다. 특히 고품질의 풍력자원을 이용하고 소음 피해를 최소화하기 위하여 해안에서 멀리 떨어진 해역에 대규모 풍력단지가 조성되는 추세이다. 해상에 풍력단지가 건설됨에 따라 영해나 영공 감시를 위한 레이더에 간섭을 일으키는 문제 이외에도 해상에서 육상으로 송신하는 조난통신을 간섭하는 지에 대한 분석이 필요하다. 이를 위해서 본 연구에서는 선박에서 MF 또는 HF 대역의 전자파를 송신할 경우, 선박과 육상 기지국 사이에 위치한 해상풍력 발전단지가 송신된 전자파에 대한 간섭 여부를 분석하였다. 이를 위해 대상지역을 수치지형도와 풍력발전기 CAD모델을 활용하여 주변 환경 및 해상풍력 발전단지를 전자기학적으로 모델링하였다. 파장에 비해 광범위한 지역에 대한 전파 분석이므로 고주파 분석기법이 타당하나, 적용할 고주파 분석기법을 주변해역과 지형을 간략화하여 저주파 분석기법으로 먼저 검증하였다. 해상풍력 발전단지 부근에서 송신한 신호에 대해 육상기지국에서 수신한 전력을 분석한 결과, 발전단지가 설치되더라도 거의 동일한 수준으로 전파를 수신할 수 있었다. 이는 풍력발전기가 대형 구조물이기는 하나 타워의 직경은 수 미터에 불과하므로 지향성이 없고 파장이 긴 MF 및 HF 대역에 대해서는 큰 장애물로 작용하지 않기 때문으로 판단된다. Recently, the share of wind power in energy markets has sharply increased with the active development of renewable energy internationally. In particular, large-scale wind farms are being developed far from the coast to make use of abundant wind resources and to reduce noise pollution. In addition to the electromagnetic interference (EMI) caused by offshore wind farms to coastal or air surveillance radars, it is necessary to investigate the EMI on global maritime distress and safety system (GMDSS) communications between ship and coastal stations. For this purpose, this study investigates whether the transmitted field of MF/HF band from a ship would be subject to interference or attenuation below the threshold at a coastal receiver. First, using geographic information system digital maps and 3D CAD models of wind turbines, the area of interest is electromagnetically modeled with patch models. Although high frequency analysis methods like Physical Optics are appropriate to analyze wide areas compared to its wavelength, the high frequency analysis method is first verified with an accurate low frequency analysis method by simplifying the surrounding area and turbines. As a result, the received wave power is almost the same regardless of whether the wind farms are located between ships and coastal stations. From this result, although wind turbines are large structures, the size is only a few wavelengths, so it does not interfere with the electric field of MF/HF distress communications.

토복령(土茯笭)의 Raw 264.7 세포에 대한 항염효과

오성원,김병우,Oh, Sung-Won,Kim, Byoung-Woo 대한한방내과학회 2009 大韓韓方內科學會誌 Vol.30 No.2

Objective : Inflammatory cytokines have a close relationship to insulin dependent diabetes mellitus (IDDM). The inhibitory effect of Smilacis Glabrae Rhizoma (SGR) were examined on production of nitric oxide (NO), prostaglandin $E_2$ $(PGE_2)$, synthase (iNOS), cyclooxygenase-2 (COX-2), tumor necrosis factor-${\alpha}$ (TNF-${\alpha}$) and NF-${\kappa}$B activation in Raw 264.7 cells. Methods: Raw 264.7 cells were pretreated with SGR(20, 50, 100 ${\mu}g$/ml), and then cultured with lipopolysaccharides (LPS). Cell viability was measured by MTT assay; inhibition of NO, $PGE_2$, and TNF-${\alpha}$ production were measured by Griess reagent and enzyme-linked immunosorbent assay(ELISA). Induction of COX-2 and iNOS were determined by western blotting analysis. Inhibition of NF-${\kappa}$B was measured by immunofluorescence assay (IFA). Results: SGR inactivated NF-${\kappa}$B, and inhibited the production of NO, iNOS, and $PGE_2$. Inhibition of COX-2 and TNF-${\alpha}$ could not be confirmed. Conclusions: From the above result. SGR was found to have an anti-inflammatory effect of inhibition of NO, iNOS, and $PGE_2$ production via inhibition of NF-${\kappa}$B.

손저림 증상을 호소하는 86명의 환자들에 대한 아시혈 진단법과 약침치료 효능에 관한 연구

오성원,정종진,김수연,한인선,강현민,권기록,김병우,Oh, Sung-Won,Jeong, Jong-Jin,Kim, Soo-Yeon,Han, In-Sun,Kang, Hyun-Min,Kwon, Ki-Rok,Kim, Byoung-Woo 대한약침학회 2007 Journal of pharmacopuncture Vol.10 No.3

Objectives Hand paresthesia is common syndrome and the cause is more unknown than known reason. The Purpose of this study were investigated the effects of Myofacial Pain Syndrome theory to make diagnosis and treatment by Pharmacopuncture for the patients of hand paresthesia. Method This study was carried out to established the clinical criteria of hand parethesia. The patients who had past history of diabeics, neuropathy induced by alcohol or drug were excluded, and 86 patients who had hand paresthesia related with unknown-reason was selected by the interview process. And the effects of Pharmacopuncture theory were analyzed using VAS score before and after treatment. Results and conclusions 56.9% of unknown-reason patients are positive at diagnosis by MPS theory. While positive group decrease from $62.81{\pm}14.27$ to $25.28{\pm}15.97$, negative group decrease from $55.88{\pm}10.92$ to $48.28{\pm}14.01$ by VAS scores. Positive group was accordingly more effective than negative group. So diagnosis and treatment for hand numbness patients by MPS theory was useful in clinical.

흉곽출구증후군으로 손 저림을 호소하는 환자들에 대한 Sweet BV의 아시혈적 치료 효능 관찰

오성원,김병우,안중철,윤휘철,박재석,권기록,Oh, Sung-Won,Kim, Byoung-Woo,An, Joong-Chul,Yoon, Hye-Chul,Park, Jae-Seuk,Kwon, Ki-Rok 대한약침학회 2010 Journal of pharmacopuncture Vol.13 No.2

Objectives: The objective of this study was to compare the effects of Sweet Bee Venom(Sweet BV) Therapy between the hand paresthesia patients with Osteoporosis and without Osteoporosis. Methods: This study was carried out to established the clinical criteria of hand parethesia. The patients who had past history of diabeics, neuropathy induced by alcohol or drug and was positive on Myofacial Pain Syndrome Theory were excluded. 32 patients who had hand paresthesia related with unknown-reason was selected by the interview process. And the effects of treatment were analyzed using VAS score before treatment, after treatment, after 1 month and after 3 months. Results and conclusion: After treatment, While Osteoporosis group decrease from $64.81{\pm}7.81$ to $27.21{\pm}7.32$, Non-Osteoporosis group decrease from $58.76{\pm}1.43$ to $24.74{\pm}3.81$ by VAS scores. and After 3 months, While Osteoporosis group increase from $27.21{\pm}7.32$ to $54.96{\pm}9.40$, Non Osteoporosis group increase from $24.74{\pm}3.81$ to $32.43{\pm}5.57$. Non-Osteoporosis group was accordingly more effective than Osteoporosis group after 3 months. So Sweet BV therapy for hand numbness patients without Osteoporosis was e effective than patients with Osteoporosis.

원주 TIG 용접에서 이면비드 추정에 관한연구

오성원,장희석 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-

Recently TIG(Tungsten Inert Gas) welding of pipe is widely used in many industrial fields. Especially. TIG welded LNG pipelines are being rapidly spread since LNG is recommended as a "clean" energy source. But it is difficult to guarantee good weld quality due to unfavorable working condition on the welding sites. Furthermore, labor cost for qualified welder is getting higher and higher. Therefore, automatic orbital TIG welding system would be good alternative. The change of surface temperature near molten pool proved to have significient effect on the back bead size. in this study, the back bead shape is estimated by ANN(Artificial Neural Net), and sampled welding process variables including surface temperature are fed into the trained neural networks to generate height and width of the back bead. The estimated back bead size shows good agreement with the actual size.

발달 장애 아동의 자해행동에 대한 다양한 중재의 효과

오성원 단국대학교 사범대학 특수교육과 사례연구회 2001 사례연구집 Vol.7 No.-

함정 통제체계의 통합 아키텍쳐 연구

오성원 한국군사과학기술학회 2018 한국군사과학기술학회지 Vol.21 No.1

The operational concept of control systems on surface combatants has been changed from individual control for each system to integrated control for all systems due to computing technology development and crew reduction policy of navy. The purpose of this study is to identify current status of control technology, to analyze user requirement and to develop an architecture to support the conceptual change of ship control. An architecture, which integrates several control and monitoring systems on naval surface combatant, is proposed. The proposed architecture is focused on sharing network and computing resources related to user command, and reducing systems complexity. The architecture can be adopted to next surface combatants in Korean navy.