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초소형 광자기 드라이브용 HGA의 신뢰성 및 충격 해석
오우석(Oh, Woo-Seok),박노철(Park, No-Cheol),양현석(Yang, Hyun-Seok),박영필(Park, Young-Pil),홍어진(Hong, Eo-Jin) 한국소음진동공학회 2004 한국소음진동공학회 논문집 Vol.14 No.12
With respect to the researches of the optical flying head(OFH) , the head-gimbal assembly should be analyzed to guarantee the stable fabrication and the characteristics of shock resistance. The suitable design is proved through the Probabilistic analysis of the design parameters and material properties of the model. Probabilistic analysis is a technique that be used to assess the effect of uncertain input parameters and assumptions on your analysis model. Using a probabilistic analysis you can find out how much the results of a finite elements analysis are affected by uncertainties in the model. Another factor is analysis of the dynamic shock analysis. For the mobile application, one of the important requirements is durability under severe environmental condition, especially, resistance to mechanical shock. An important challenge in the disk recording is to improve disk drive robustness in shock environments. If the system comes in contact with outer shock disturbance. the system gets critical damage in head-gimbal assembly or disk. This paper describes probabilistic and dynamic shock analysis of head-gimbal assembly in micro MO drives using OFH slider.
오우석(Woo Seok Oh),김규식(Gyu Sik Kim),강윤배(Youn Bae Kang) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In this paper, we attempt to control the pressure between two specimens using a servo gun m the resistance spot welding process. Servo guns have some advantages over pneumatic guns in that the fast response, the precise position control, and the accurate torque control are assured by virtue of the servo motor control, To demonstrate. the practical significance of our results, we present some experimental results.
감성돔(Acanthopagrus schlegeli)의 유영자세각과 체장에 따른 200 kHz대역 음향산란강도
최정화 ( Jung-hwa Choi ),오우석 ( Woo-seok Oh ),윤은아 ( Euna Yoon ),임양재 ( Yang-jae Im ),이경훈 ( Kyounghoon Lee ) 한국수산과학회(구 한국수산학회) 2018 한국수산과학회지 Vol.51 No.5
This study determined the acoustic target strength (TS; dB) of black seabream Acanthopagrus schlegeli off the southern coast of Korea. For the ex-situ measurements, 200 kHz split beam transducers were used, and a Kirchhoffray mode (KRM) model acoustic model was used for the calculation. The fork length and total weight of the black seabream ranged from 6.4 to 30.8 cm and 6.4 to 683.8 g. respectively 200 kHz , the TS could beexpressed as a function of fork length as: TS<sub>max</sub>=20log<sub>10</sub>(FL)-60.35(R=0.92) and TS<sub>avg</sub>.=20log<sub>10</sub>(FL)-66.89(R=0.88). These TS results for black seabream can be used for estimating the biomass of fish in acoustic surveys in coastal areas.
국가장기생태연구 장소로서 구축된 남산 소나무림의 생태적 특성
이창석,조용찬,신현철,이충화,이선미,설은실,오우석,박성애,Lee, Chang-Seok,Cho, Yong-Chan,Shin, Hyun-Cheol,Lee, Choong-Hwa,Lee, Seon-Mi,Seol, Eun-Sil,Oh, Woo-Seok,Park, Sung-Ae 한국생태학회 2006 Journal of Ecology and Environment Vol.29 No.3
국가 장기 생태 연구를 위해 구축된 서울 남산의 영구 방형구에서 소나무림의 종 조성, 주요 종의 공간분포, 직경 및 수고 계급 빈도 분포,그리고 종 다양성이 분석되었다. 수집된 자료는 도심의 다른 지역(인왕산 및 홍릉),도시 외곽 지역(아차산, 북한산, 불암산, 청계산, 대모산 및 수락산) 및 자연 지역(설악산, 속리산 및 월악산)의 자료와 비교하여 남산 소나무림의 특징을 밝혔다. 남산 소나무림은 도심의 다른 지역의 소나무림과 유사한 종 조성을 나타내었다. 그러나 도시 외곽의 것과는 약간의 차이를 보였고, 자연 지역의 것과는 큰 차이를 보였다. 남산 소나무림이 보여준 그러한 차이는 대체로 그곳에서 높은 식피율을 나타낸 때죽나무, 팥배나무, 주름조개풀, 가중나무, 서양등골나물 등에 기인하였다. 주요 수종의 직경 및 수고 계급 분포를 분석하여 예측한 결과, 남산의 소나무림은 때죽나무 숲으로 천이될 가능성을 보였다. 이러한 대체 수종은 아교목일 뿐만 아니라 비내음성 종으로서 그러한 천이 경향은 퇴행 천이로 해석될 수 있었다. 도시 외곽 및 자연 지역의 소나무림들은 각각 토지 극상으로서 그 자체가 유지되거나 참나무 숲으로 천이될 가능성을 보여 남산 지역과 차이를 나타내었다. 남산 소나무림의 종 다양성은 도시 외곽 및 자연 지역의 것보다 낮았다. 이처럼 낮은 종 다양성의 원인은 이 지역의 종 조성을 다른 지역의 것과 다르게 하는데 기여한 몇몇 종의 과도한 번성에 기인한 것으로 판단되었다. 그러한 차이를 가져온 식물들은 오염된 공업단지에 번성하는 종(때죽나무와 팥배나무), 교란된 지소를 선호하는 종(주름조개풀) 및 외래종(가중나무와 서양등골나물)이었다. 그러한 결과는 남산이 심한 환경 오염과 과도한 인간 간섭에 노출되어 있음을 반영한다. Species composition, spatial distribution of major species, diameter and height classes distribution, and species diversity were .analyzed in the Korean red pine (Pinus densiflora, hereafter referred as pine) forest in the permanent quadrats, which were designed for Long Term Ecological Research (LTER). Collected data were compared with those from the other areas including urban center (Mt. Inwang and Hongneung) and boundary areas (Mts. Acha, Bukhan, Bulam, Cheonggye, Daemo, and Surak), and natural areas (Mts. Seolak, Songni, and Wolak) to clarify the ecological characteristics of pine forest on Mt. Nam. Species composition of pine forest on Mt. Nam showed a similarity with those of urban center but did a little and big differences with those on urban boundary and natural areas, respectively. Such differences that pine forest on Mt. Nam showed, were usually due to Styrax japonicus, Sorbus alnifolia, Oplismenus undulatifolius, Ailanthus altissima, Ageratina altissima and so on, which showed higher coverage there. Predicted from diameter and height classes distribution of tree species, pine forest on Mt. Nam showed a possibility to be replaced by a S. japonica. Considered that this replacer species is not only a sub-tree but also shade intolerant, such successional trend could be interpreted as a sort of retrogressive succession. Those on urban boundary and natural areas showed a difference by displaying probabilities to be maintained as themselves as an edaphic climax or succeeded to oak forests. Species diversity of pine forest on Mt. Nam was lower than those in urban boundary and natural areas due to excessive dominance of several species, which led to different species composition from the other areas. Plants, which produced the differences, were species that flourishes in the polluted industrial area (S. japonica and S. alnifolia), favors the disturbed site (O. undulatifolius), and exotic species (A. altissima and Eupatorium rugosum). Those results reflects that pine forest of Mt. Nam was exposed on severe environmental pollution and excessive human interferences.
자갈 하중주에서 식생의 공간 분포 및 동태: 방태천의 사례
피정훈 ( Jung Hun Pee ),김혜수 ( Hye Soo Kim ),김경순 ( Gyung Soon Kim ),오우석 ( Woo Seok Oh ),구본열 ( Bon Yoel Koo ),이창석 ( Chang Seok Lee ) 한국하천호수학회 2013 생태와 환경 Vol.46 No.2
We clarified the background for establishment of vegetation by comparing the spatial distribution maps of vegetation and substrate on a gravel bar in the Bangtae stream located on Inje-gun of Gangwon-do, the central eastern Korea. The total vegetation coverage was higher in the interior and lower in the marginal parts of the gravel bar. Spatial distribution of vegetation on the longitudinal section of the gravel bar tended to be arranged in the order of shrub, subtree, and tree dominated vegetation types from the front (upstream) toward the rear (downstream) parts. Coverage of the herbaceous plants was higher in the central and rear parts and lower in the front and right parts of the gravel bar. Vegetation height was higher in the rear part and became lowered as move toward the front part. Substrate was distributed in the order of boulder, gravel, sand, and boulder from the front toward the rear parts. Ordination of stands based on vegetation data was arranged in the order of annual plant, perennial herb, shrub, and tree dominated vegetation as move from the right to the left parts on the axis I. Species richness was higher in the order of Pinus densiflora community, Phragmites japonica community, Salix gracilistyla community, Fraxinus rhynchophylla community, annual plant dominated vegetation, and Prunus padus for. padus community based on the species rank-abundance curve. The order based on the Shannon`s index was some different; diversity of Phragmites japonica community and Salix gracilistyla community, which showed higher dominance degree, were low differently from species richness. In conclusion, it was evaluated that the gravel bar newly established toward the upstream and vegetation dynamics of the gravel bar seemed to follow ecosystem mechanisms of succession. As were shown in the above results, the Bangtae stream corresponded to the upstream and thereby particle size of substrate was big. Therefore, they move by rolling and are accumulated for the upstream. Vegetation types were arranged in the order of woodland, shrub-land and grassland from the rear toward the front parts of the gravel bar and thereby reflected the formation process of the bar. However, the gravel bar is disturbed frequently by not only the running water but also the suspended sand as the dynamic space. Such disturbances cause habitat diversity and consequently led to high biodiversity.
강병조(Byeong-Jo KANG),김희주(Hee-Ju KIM),오우석(Woo-Seok OH),이경훈(Kyounghoon LEE) 전남대학교 어업기술연구소 2019 어업기술연구소보고지 Vol.12 No.1
Since the noise is included in the acoustic data collected from the underwater acoustic survey, it makes the accurate stock assessment difficult. Using the EchoView software, the noise included in the data was classified into four groups and then it was removed by algorithms and operators. The acoustic data after noise processing was represented by NASC (nautical area scattering coefficient). The NASC values before and after the noise processing showed a huge difference up to 1,731,750 times. Consequently, it means the difference in the amount of fish stock biomass. Therefore, it is very important to effectively remove the noise included in the acoustic data.
마이크로 광디스크 드라이브용 4 × 1 근접장 탐침 어레이를 위한 슬라이더와 서스펜션의 설계
홍어진(Hong, Eo-Jin),정민수(Jung, Min-Su),오우석(Oh, Woo-Seok),박노철(Park, No-Cheol),양현석(Yang, Hyun-Seok),박영필(Park, Young-Pil) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.2
The near-field scanning micro scope (NSOM) technique is in the spotlight as the next generation storage device. Many different types of read/write mechanism for NSOM have been introduced in the literature. In order for a near-field probe to be successfully implemented in the system, a suitable slider and suspension are needed to be properly designed. The optical slider is designed considering near-filed optics and probe array. The suspension generally supports slider performance, and tracking servo capacity in HDD. Moreover, the suspension for optical slider also should meet the optical characteristics, and is also required to satisfy shock performances for the mobility for the actuator. In this study, the optical slider and the suspension for near-field probe array are designed and analyzed.