혼류임펠러를 갖는 관류형팬의 성능특성

박진욱,이철형,박완순,허종철,Park, Jin-Wook,Lee, Chul-Hyung,Park, Wan-Soon,Huh, Jong-Chul 한국태양에너지학회 2007 한국태양에너지학회 논문집 Vol.27 No.2

The performance of in-line duct fan depends on the design parameters of impeller and guide vane such as sweep back angle of impeller hub, guide vane angle etc. In this study four kinds of impellers having different sweep back angles, $0^{\circ}$, $17.5^{\circ}$, $35^{\circ}$, $52.5^{\circ}$ with 8 guide vanes, and different guide vane angles, $15^{\circ}$, $30^{\circ}$, $45^{\circ}$ were selected and their performance measured to investigate the effects of design parameters. The results show that both sweep back angle of impeller hub and the guide vane angle have large effect on the efficiency. Especially, it was found that the mixed flow impellers having sweep back angle between $17.5^{\circ}$ and $35^{\circ}$ gave good performances for in-line duct fan.

협대역 고출력 전자기파에 의한 CMOS IC의 전기적 특성 분석

박진욱,허창수,서창수,이성우,Park, Jin-Wook,Huh, Chang-Su,Seo, Chang-Su,Lee, Sung-Woo 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.9

The changes in the electrical characteristics of CMOS ICs due to coupling with a narrow-band electromagnetic wave were analyzed in this study. A magnetron (3 kW, 2.45 GHz) was used as the narrow-band electromagnetic source. The DUT was a CMOS logic IC and the gate output was in the ON state. The malfunction of the ICs was confirmed by monitoring the variation of the gate output voltage. It was observed that malfunction (self-reset) and destruction of the ICs occurred as the electric field increased. To confirm the variation of electrical characteristics of the ICs due to the narrow-band electromagnetic wave, the pin-to-pin resistances (Vcc-GND, Vcc-Input1, Input1-GND) and input capacitance of the ICs were measured. The pin-to-pin resistances and input capacitance of the ICs before exposure to the narrow-band electromagnetic waves were $8.57M{\Omega}$ (Vcc-GND), $14.14M{\Omega}$ (Vcc-Input1), $18.24M{\Omega}$ (Input1-GND), and 5 pF (input capacitance). The ICs exposed to narrow-band electromagnetic waves showed mostly similar values, but some error values were observed, such as $2.5{\Omega}$, $50M{\Omega}$, or 71 pF. This is attributed to the breakdown of the pn junction when latch-up in CMOS occurred. In order to confirm surface damage of the ICs, the epoxy molding compound was removed and then studied with an optical microscope. In general, there was severe deterioration in the PCB trace. It is considered that the current density of the trace increased due to the electromagnetic wave, resulting in the deterioration of the trace. The results of this study can be applied as basic data for the analysis of the effect of narrow-band high-power electromagnetic waves on ICs.

과도 안정도를 고려한 총 송전용량 평가

박진욱,배인수,김진오,김규호,Park, Jin-Wook,Bae, In-Su,Kim, Jin-O,Kim, Kyu-Ho 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.7

본 논문은 기존의 총 송전용량 결정에 있어서 고려하기 어려웠던 과도 안정도 제약을 판별법을 적용하기 위해 2단계 계산 기법을 이용하여 보다 용이하게 적용하였다. 총 송전용량을 계산하기 위한 방법으로 첫 번째 단계에서는 RPF(Repeated Power Flow) 방법을 이용하여 전압과 열적한계를 판별하고, 두 번째 단계에서는 첫 번째 단계에서 결정된 총 송전용량이 시스템의 과도 안정도 조건의 위반여부를 판별하여 시스템의 총 송전용량을 결정하였다. This paper presents a method to assess total transfer capability(TTC) considering transient stability. TTC is limited not only by the violation of system voltage and thermal limits, but also restricted by transient stability limit, TTC calculation is divided into two processes. The frist step is to calculate TTC without considering the transient stability constraint by using repeated power flow(RPF) method. The second step is to perform transient stability analysis based on TTC calculation in the frist step.

풍수해생활권 종합정비사업 소개 (모래내지구를 중심으로)

박진욱,김영준,박용중,Park, Jin-Uk,Kim, Yeong-Jun,Park, Yong-Jung 한국수자원학회 2021 물과 미래(한국수자원학회지) Vol.54 No.9

슬관절 외측 및 후외측 불안정성에 대한 외측 보강술 및 슬와근 건고정술

박진욱,이주협,손승원,Park, Jin-Uck,Lee, Ju-Hyup,Sohn, Sung-Won 대한관절경학회 2004 대한관절경학회지 Vol.8 No.2

목적: 외상으로 인한 슬관절 외측 및 후외측 불안정성을 보이는 환자에게 있어 동시 외측 보강술 및 슬와근 건고정술을 시행하는 방법으로 그 치료결과를 보고하고자 한다. 대상 및 방법: 1996년 7월부터 2003년 7월까지 슬관절 외측 및 후외측 불안정성으로 진단 받고 외측보강술 및 슬와근 건고정술 후 1년 이상 추시 관찰이 가능했던 21예를 대상으로 하였다. 남자가 15예, 여자가 6예이었으며 평균연령은 38.5세였다. 손상 후 수술까지의 평균기간은 6.8개월이었다. 슬관절 외측 및 후외측 불안정성의 치료에 있어 본원에서는 대퇴부 외상과에서, 3예에서는 아킬레스 동종건 이식을 시행하였고 18예에서 내측부 인대용 ABC인조인대(Active Bioprosthetic Composite Polyester Ligament, Surgicraft, U. K. )를 이용하여 외측 측부인대의 보강 및 슬와근 건고정술을 동시에 시행하였다 결과: 최종 추시상 슬관절 90도 굴곡 후방 부하 방사선 촬영상 후방 전위의 정도는 건측에 비해 평균 5.6 mm에서 2.5 mm로 개선되었다. 슬관절 30도 굴곡상태의 내반 검사는 전위정도가 건측에 비해 수술 전 평균 8.2 mm의증가소견을 보였으나, 수술 후에는 평균 2 mm의 증가소견만을 보였다. Lysholm score는 수술 전 평균 52.5점에서 수술 후 평균 86.7점으로 34.2점 증가하였고 자가건 이식과 ABC 인조인대를 사용한 군에서 결과는 유의한 차이점은 없었다. 결론: 슬관절의 외측 및 후외측 불안전성에 대한 외측 보강술 및 슬와건 건고정술은 수기 및 수술 후 치료방법이간단하며, 임상적, 방사선학적 평가 결과로 미루어 보아 효과적인 치료 방법 중의 하나로 판단된다. Purpose: The purpose of this study was to make a report on the clinical prognosis of post traumatic lateral and posterolateral instability of the knee after LCL augmentation and popliteal tenodesis. Materials and Methods: The assessment was made among 21 cases who underwent augmentation of lateral collateral ligament(LCL) and popliteal tenodesis with allograft or artificial ligament (synthetic polyester, ABC ligament, Surgicraft, U.K.) at this Medical Center during the period from July 1996 to July 2003 and whose follow-up period was longer than one year. The authors recorded and analysed the physical findings (external rotation recurvatum test & posterolateral drawer test), stress roentgenograms(preoperative and postoperative) and Lysholm score. Results: The lateral and posterolateral instability of the knee were improved in 20 cases postoperatively, acccording to the clinical test and stress roentgenograms . Average Lysholm score was 52.5 preoperatively and 86.7 postoperatively .Conclusion: Our study found the surgery of lateral and posterolateral instability of the knee with augmentation of LCL and popliteal tenodesis using allograft or artiflcial ligament is simple technique. Taking these results into consideration, it seems to be one of effective methods of treatment.

지하대공간 초동 화재진압에 적용가능한 자율형 소화체계의 폼 분사 해석 기법 연구

박진욱,유용호,김휘성,Park, Jinouk,Yoo, Yongho,Kim, Whiseong 한국터널지하공간학회 2021 한국터널지하공간학회논문집 Vol.23 No.6

자율형 초동소화 체계는 복합적 감지 기술 및 화재 위치별 정확한 타격을 위한 분사/제어 기술등에 대한 고도의 기술이 필요하다. 또한, 상황에 따라 유류화재에 대한 대응을 위해 폼(foam) 분사 기능이 포함하여야 한다. 다만, 단일 분사 모니터를 공용으로 사용할 시 청수와 폼(foam) 분사 특성이 상이하므로 정확한 화재 진압을 위해서는 분사궤적 및 거리에 대한 연구가 필요하다. 본 연구에서는 자율형 소화체계 구축을 위해 개발된 분사 모니터를 통한 폼 분사 특성 분석을 위해 실험적 연구와 수치해석적 연구를 복합적으로 수행하였다. 폼 분사에 대한 유동해석을 위해 OpenFOAM 해석 소프트웨어를 사용하여 모델링을 하였으며, 폼 특성은 일반적인으로 사용되고 있는 포소화약제 수성막포를 적용하였다. 폼 형태에 따라 분사압, 분사각에 따른 분사 거리 해석을 수행하였으며, 동시에 분사 실험을 통해 결과에 대한 검증 및 결과를 제시하였다. Autonomous fire detection and suppression system requires advanced technology for complex detection technology and injection/control technology for accurate hitting by fire location. Also, foam spraying should be included to respond to oil fires. However, when a single spray monitor is used in common, water and foam spray properties appear different, so for accurate fire suppression, research on the spray trajectory and distance will be required. In this study, experimental studies and numerical analysis studies were combined to analyze the foam spray characteristics through the spray monitor developed for the establishment of an autonomous fire extinguishing system. For flow analysis of foam injection, modeling was performed using OpenFOAM analysis software, and the commonly used foaming agent (Aqueous Film-Forming Foam) was applied for foam properties. The injection distance analysis was performed according to the injection pressure and the injection angle according to the form of the foam, and at the same time, the results were verified and presented through the injection experiment.

수소 제트화염이 터널 구조체에 미치는 영향 분석

박진욱,유용호,김휘성,Park, Jinouk,Yoo, Yongho,Kim, Whiseong 한국터널지하공간학회 2021 한국터널지하공간학회논문집 Vol.23 No.6

A policy to expand the hydrogen economy has been established in Korea and the supply of FCEV is being expanded to realize a hydrogen society. Therefore, the supply of FCEV is expected to increase rapidly, and a solution to respond to accidents of FCEV is required. In this study, an experimental study was conducted to analyze the effect of the hydrogen jet flame generated by a FCEV on the inner wall of the tunnel and the characteristics of the internal radiant heat. For the experiment, the initial pressure of hydrogen tank was set to 700 bar, and the injection nozzle diameter was set to 1.8 mm in order to make the same as the conditions generated in the FCEV. In addition, a tunnel fire resistance test specimen having the same strength as the compressive strength of concrete applied to general tunnels of 40 MPa was manufactured and used in the experiment. The results were analyzed for the separation distance (2 m and 4 m) between the hydrogen release nozzle and the tunnel fire resistance test concrete. As the result, the maximum internal temperature of the test concrete was measured to 1,349.9℃ (2 m separation distance), and the radiant heat around the jet flame was up to 39.16 kW/m². 국내에서는 수소경제 활성화 정책을 수립하고 수소사회 실현을 위해 수소 인프라 및 수소차 보급 확대를 계획 하고 있다. 이에 따라 수소차의 보급이 급속도로 이루어질 것으로 예상되며, 동시에 수소차의 사고에 대응하기 위한 대책의 확립이 요구되고 있다. 본 연구에서는 수소차에 의해서 발생되는 수소 제트화염이 터널 내부 벽체에 미치는 영향과 내부 복사열 특성 분석을 위해 실험적 연구를 수행하였다. 실험은 수소차에서 발생되는 조건과 동일하게 하기 위해 분사압력을 700 bar로 설정하고, 분사노즐 직경은 1.8 mm로 설정하였다. 또한, 일반 터널에 적용되고 있는 콘크리트 압축강도 40 MPa의 터널 내화 시험체를 제작하고 제트화염 분사노즐과 시험체간의 이격거리에 따른 영향을 검토하였다. 분사노즐과 터널 내화시험체의 이격거리를 변수로 하여 2 m와 4 m에 대해 결과를 분석하였다. 그 결과로부터 시험체 내부 최대 온도는 1,349.9℃ (이격거리 2 m)가 측정되었고, 제트화염 주위 복사열은 최대 39.16 kW/m²까지 나타났다.

협대역 고출력 전자기파로 인한 CMOS IC에서의 오동작 특성 연구

박진욱,허창수,서창수,이성우,Park, Jin-Wook,Huh, Chang-Su,Seo, Chang-Su,Lee, Sung-Woo 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.9

This study examined the malfunction mode of the HCMOS IC under narrow-band high-power electromagnetic wave. Magnetron is used to a narrow-band electromagnetic source. MFR (malfunction failure rate) was measured to investigate the HCMOS IC. In addition, we measured the resistance between specific pins of ICs, which are exposed and not exposed to the electromagnetic wave, respectively. As a test result of measurement, malfunction mode is shown in three steps. Flicker mode causing a flicker in LED connected to output pin of IC is dominant in more than 7.96 kV/m electric field. Self-reset mode causing a voltage drop to the input and output of IC during electromagnetic wave radiation is dominant in more than 9.1 kV/m electric field. Power-reset mode making a IC remained malfunction after electromagnetic radiation is dominant in more than 20.89 kV/m. As a measurement result of pin-to-pin resistance of IC, the differences between IC exposed to electromagnetic wave and normal IC were minor. However, the five in two hundred IC show a relatively low resistance. This is considered to be the result of the breakdown of pn junction when latch-up in CMOS occurred. Based on the results, the susceptibility of HCMOS IC can be applied to a basic database to IC protection and impact analysis of narrow-band high-power electromagnetic waves.

터널 방재설비의 합리적 설치를 위한 분석적 연구

박진욱,유용호,박병직,Park, Jin-Ouk,Yoo, Yong-Ho,Park, Byoung-Jik 한국터널지하공간학회 2015 한국터널지하공간학회논문집 Vol.17 No.3

최근 국내에서는 도로 및 철도 터널의 건설이 꾸준히 증가하고 있으며, 교통체증 해소 및 도시계획 그리고 개량공사 등에 따라 터널이 더 깊은 지하에 위치하거나 장대화되고 있는 추세이다. 이러한 경우 터널 내부사고 중 인명피해에 가장 큰 위험요소인 화재사고가 발생할 경우 대형사고로 이어질 확률이 굉장히 높아진다. 본 연구에서는 정량적 위험도 분석 기법인 QRA(Quantitative Risk Analysis)를 터널에서의 방재설계에 적용하고자 국내 QRA 사례분석을 수행하고, QRA 기법의 적용 유무에 따른 비용 산출을 비교하였다. 그리고 AHP(Analytic Hierachy Process)기법을 사용하여 터널 방재시설의 위험도 저감 효과를 분석하여 터널 화재시 위험도를 낮출 수 있는 중요 인자들에 대한 우선순위를 제시 하였다. 그 결과로부터 QRA가 적용된 사례에서 상당한 비용절감 효과가 나타났으며, 그로 인해 합리적인 방재시설의 설계가 가능할 것으로 판단하였다. 그리고 방재시설별 비용대비 위험도 저감효과를 통한 방재시설 우선순위는 송수관설비, 비상조명, 대피통로, 제연설비의 순으로 분석되었다. Domestic road and railroad construction have been increasingly growing and for reasons of mitigating traffic congestion, urban plan and refurbishment project, deeper and longer tunnels have been built. The event of fire is the most fatal accident in a tunnel, and it can be very disastrous with a high possibility. In this study, QRA (Quantitative Risk Analysis) which is one of quantitative risk analysis approaches was applied to tunnel fire safety design and the evaluation of QRA cases and the cost comparison of QRA methods were carried out. In addition analysis of risk reduction effect of tunnel fire safety system was conducted using AHP (Analytic Hierarchy Process) and the priority of major factors that could mitigate the risk in tunnel fire was presented. As a result, significant cost reduction effect could be obtained by incorporating QRA and it is expected to design fire safety system rationally. The priority of fire safety system based on risk mitigation effect by fire safety system considering the cost is in order of water pipe, emergency lighting, evacuation passage and smoke control system.

음성존재확률을 이용한 행렬식 기반 2채널 잡음제거기법

박진욱,홍정표,Park, Jinuk,Hong, Jungpyo 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.5

In this paper, a determinant-based two-channel noise reduction method which utilizes speech presence probability (SPP) is proposed. The proposed method improves noise reduction performance from the conventional determinant-based two-channel noise reduction method in [7] by applying SPP to the Wiener filter gain. Consequently, the proposed method adaptively controls the amount of noise reduction depending on the SPP. For performance evaluation, the segmental signal-to-noise ratio (SNR), the perceptual evaluation of speech quality, the short time objective intelligibility, and the log spectral distance were measured in the simulated noisy environments considered various types of noise, reverberation, SNR, and the direction and number of noise sources. The experimental results presented that determinant-based methods outperform phase difference-based methods in most cases. In particular, the proposed method achieved the best noise reduction performance maintaining minimum speech distortion.