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한윤식,이종원 한국소음진동공학회 1998 소음 진동 Vol.8 No.5
A new signal processing technique, the directional harmonic wavelet map(dHWM), is presented to characterize the instantaneous planar motion of a measurement point in a structure from its transient complex-valued vibration signal. It is proven that the directional auto-HWM essentially tracks the shape and directively of the instantaneous planar motion, whereas the phase of the directional cross-HWM indicates its inclination angle. Finally, the technique is suessfully applied to an automobile engine for characterization of its transient motion during crank-on/idling/engine-off.
초고밀도 디스크 드라이브를 위한 반 진공 작동 환경에서 서보 트랙 기록 방법에 의한 RRO 저감에 대한 연구
한윤식,강심우 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.11
In high-capacity disk drives with ever-growing track density, the allowable level of position error signal(PES) is becoming smaller and smaller. In order to achieve the high TPI(track per inch) disk drive, it is necessary to improve the writing accuracy during the servo track writing(STW) Process through the reduction of track mis-registration sources. Among the main contributors of the non-repeatable runout(NRRO) PES, the disk vibration and the head-stack assembly vibration is considered to be one of the most significant factors. Also the most contributors of repeatable runout(RRO) come from the contributors of NRRO which is written-in at the time of STW process. In this paper, the effect of NRRO on servo written-in RRO is Investigated by experimentally, and the experimental result shows that the written-in RRO can be effectively reduced through a STW process under low dense medium condition such as semi-vacuum.
편측성 구순구개열 환자에 있어 구순성형술과 동반한 서골피판법
한윤식,이호,서병무 대한구순구개열학회 2010 대한구순구개열학회지 Vol.13 No.2
Vomer flap is used to repair anterior hard palate in complete cleft lip and palate patients. As the midline structure located in between the two cleft segments of hard palate, the vomer flap is very useful because of its vicinity to cleft site and their ease of execution when it is done with primary cheiloplasty simultaneously. In addition, the quality of tissue is very similar to that of the nasal mucosa with good vascularity. In cases of simultaneous repair of cleft lip with anterior palate using vomer flap, the hard palate can be repaired at the same time with primary cheiloplasty which is earlier period than other techniques. With simultaneous close of cleft lip and cleft hard palate by vomer flap, subsequent palatoplasty does not require wide dissection, and consequently chance of oronasal fistula formation will be minimized. Additionally, surgical time will be reduced and, the harmful effects on mid-facial growth will be diminished. In this article, we will introduce the comprehensive vomer flap technique with primary lip closure and review the comparative studies of the outcome of simultaneous repair of cleft lip and cleft hard palate with vomer flap.
진동 신호의 방향 파워 스펙트럼을 이용한 엔진의 실화 실린더 탐지
한윤식(Y. S. Han),한우섭(W. S. Han),이종원(C. W. Lee) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.2
A new signal processing technique is applied to four-cylinder spark and compression ignition engines for the diagnosis of power faults inside the cylinders. This technique utilizes two-sided directional power spectra(dPS) of complex vibration signals measured from engine blocks as the patterns for engine cylinder power faults. The dPSs feature that they give not only the frequency contents but also the directivity of the engine block motion. For the automatic detection/diagnosis of cylinder power faults, pattern recognition method using multi-layer neural networks is employed. Experimental results show that the success rate for diagnosis of cylinder power faults using dPSs is higher than that using the conventional one-sided power spectra. The proposed technique is also tested to check the robustness to the sensor position and the engine rotational speed.<br/>
뮈텔 주교의 《서울 대목구 지도서》(Directorium Missionis de Seoul, 1923) 연구
한윤식(HAN, Youn-Sik) 한국교회사연구소 2011 敎會史硏究 Vol.0 No.37
In 1923, Mutel, Bishop of Vicariate Apostolic of Seoul, published Directorium Missionis de Seoul to suggest specific ministerial action plans for his priests to follow. It is an important directory for us to understand the way Bishop Mutel did his ministry in Vicariate Apostolic of Seoul and to draw a concrete picture of his various ministerial activities as bishop. It is also an important document to help understand the ministerial works of his priests and the spiritual life of the faithful there in 1920’s. Despite its importance, however, little effort has been made in studying it systematically. In order to provide some supplementary study on this directory, thus, I try to introduce the process of it being designed and published. The second step is to take a look at the emphasized points that Bishop Mutel made in promulgating it. It is followed by the study on the main points and specifics in order of contents. The study on the norms of the directory has its importance in two ways; first, it remains as a directory not only in Vicariate Apostolic of Seoul, but also it has become main norms in the entire Church in Korea since 1924. Secondly, a significant amount of its contents was included and developed in Directorium commune Missionis Coreae(Common Directory of Korean Catholic Church), which was published in 1932 and regarded as Korean Catholic ministerial directory that has had a consistent impact on the faithful since then. It is, thus, my understanding that Directorium Missionis de Seoul deserves a significant consideration and study in that it helps us understand the priestly ministry and spiritual life of the faithful in Vicariate Apostolic of Seoul in late 1920’s as well as in the entire Korean Catholic Church in twentieth century.