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다채널 제어알고리듬을 이용한 음향 가진된 밀폐계 평판의 능동진동제어
홍진석,박수홍,김흥섭,오재응,정진태,Hong, Jin-Seok,Park, Su-Hong,Kim, Heung-Seop,O, Jae-Eung,Jeong, Jin-Tae 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.6
This paper presents the multi-channel active vibration control of a flexible plate of the acoustically loaded enclosure. The flexible plate was excited acoustically with sinusoidal and white noise input. The control was performed by two piezo ceramic actuators and two accelerometers. The experimental results were compared with the single channel control results. In the case of white noise input, 20 dB of vibration reduction was achieved below 300Hz frequency range. The experimental results demonstrate that multi-channel filtered-x LMS algorithm is effective than single-channel filtered-x LMS algorithm in active vibration control of plate.
홍진석 ( Jin Seok Hong ),이진호 ( Chin Ho Rhee ),이종선 ( Jong Sun Lee ),조용선 ( Yong Sun Cho ),윤석권 ( Seok Kweon Yun ),김한욱 ( Han Uk Kim ) 대한피부과학회 2009 대한피부과학회지 Vol.47 No.7
Sebaceous trichofolliculoma is a rare benign tumor and represents a variant of trichofolliculoma. It presents as a centrally depressed solitary tumor and occurs in areas rich in sebaceous lobules. Microscopically, it shows keratin-filled cystic cavities and sebaceous lobules. The lobules are connected to the cystic wall. Herein we report a case of sebaceous trichofolliculoma on the right cheek in a 64-year-old man. (Korean J Dermatol 2009;47(7):835~837)
홍진석 ( Jin Seok Hong ),박진 ( Jin Park ),남경화 ( Kyung Hwa Nam ),윤석권 ( Seok Kweon Yun ),김한욱 ( Han Uk Kim ),임철완 ( Chull Wan Ihm ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.7
Neuromas are hyperplasia of axons and associated nerve sheath cells. Cutaneous neuromas are uncommon. Three kinds of true neuromas exist in the skin and mucous membranes: traumatic neuromas, solitary palisaded encapsulated neuromas, and multiple mucosal neuromas. Traumatic neuromas are usually solitary, skin-colored or pink, firm papules or nodules at the sites of scars following local trauma. A 2-year-old male patient presented a solitary rice grain sized, skin-colored painful and tender polypoid papule on the left 2nd finger. The lesion was superimposed on a small linear scar. The patient had taken a trauma by a broken piece of glass about one month before the development of the neuroma. We report a case of traumatic neuroma with a review of the literature. (Korean J Dermatol 2008;46(7):969~972)
홍진석 ( Jin Seok Hong ),이승용 ( Seung Yong Lee ),박진 ( Jin Park ),이종선 ( Jong Sun Lee ),윤석권 ( Seok Kweon Yun ),김한욱 ( Han Uk Kim ),임철완 ( Chull Wan Ihm ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.5
We report a case of pancreatic panniculitis associated with acute pancreatitis. The patient was a 63-year-old woman who presented with multiple painful erythematous nodules on both shins and had a mild fever and chill. Histopathologic findings showed fat necrosis with anucleate “ghost-like” fat cells with a thick shadowy wall. Laboratory evaluation revealed an increase in serum blood amylase and lipase. We diagnosed as pancreatic panniculitis associated with acute pancreatitis. Past medical history included rheumatoid arthritis and chronic renal failure treated with hemodialysis. She was taking several medicines due to rheumatoid arthritis and was newly prescribed the mizoribine (Bredinin(R)), 50 mg twice daily for 50 days. We therefore considered the possibility of drug induced pancreatitis due to mizoribine. (Korean J Dermatol 2008;46(5):674∼677)
상용차 배기계에서 액티브 머플러를 이용한 배기 소음 제어
홍진석(Jin Seok Hong),김흥섭(Heung Seob Kim),김건상(Kim Geon Sang),오재응(Jae-Eung Oh) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
In this study, active muffler was designed and was manufactured for exhaust noise reduction of commercial vehicle, then experiment of real vehicle was conducted. In a manufactured active muffler, because the flow of exhaust noise in tail pipe outlet are became a plane wave, the global reduction of radiation noise from outlet and the placement of error microphone to avoid the exhaust gas of high temperature could be implemented. In control algorithm, reduction of noise of engine driving frequency and harmonic frcquency can be archived using the proposed reference signal including a fixed speed state(2,000 rpm, 3,000 rpm, 4,000 rpm) and a run-up speed state(2,000 rpm → 4,000 rpm) are accomplished with the active muffler installed in vehicle.<br/>
홍진석(Jin Seok Hong),김용대(Yong Dai Kim),김홍섭(Heung Seib Kim),송진호(Jin Ho Song),오재웅(Jae-Eung Oh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this paper an application of an active muffler system is presented for reducing exhaust noise of a heavy vehicle. For improving the signal-to-noise ratio in the process of estimating the transfer function of a secondary path, the conventional inverse modeling combined with an adaptive line enhancer was used as a control strategy. The passive muffler using a simple expansion element was combined with the active muffler system instead of the conventional passive exhaust system to reduce exhaust noise and flow restriction simultaneously. The test vehicle implemented with the combined muffler system had been driven in a stationary state and run up state respectively. The experimental results showed the reduction effects on exhaust noise at each driving state.<br/>
자율 주행을 위한 영상 기반 차선 인식 및 조향 결정 알고리즘
홍진석(Jin Seok Hong),윤원열(Won Yeol Yoon),권남규(Nam Kyu Kwon) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6
This paper proposes a lane detection-based autonomous driving algorithm using real time image processing suitable for embedded systems. Lanes are detected using image processing method such as edge detection, blob detection, and contour detection. The detected lanes are used to calculate the target steering angle. To verify the validity of the proposed method, we obtain the accuracy of the steering angle decision through four experiments. Experimental results guarantee the feasibility and reliability of the proposed method.