• Journal of Information Technology and Architecture
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• v.9 no.4
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• pp.413-422
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• 2012

Many researchers have been studied to reveal human natural language to let machine understand its meaning by text based, page rank based or more. Particularly, it has been considered that URL and HTML Tag information in web documents are attracting people' attention again to analyze huge amount of web document automatically. In this paper, we propose a STW (Semantic Term Weight) approach based on syntactic and linguistic structure of web documents in order to classify what genres are. For the evaluation, we analyzed more than 1,000 documents from 20-Genre-collection corpus for training the documents based on SVM algorithm. Afterwards, we tested KI-04 corpus to evaluate performance of our proposed method. This paper measured their accuracy by classifying them into an experiment using STW and one without u sing STW. As the results, the proposed STW based approach showed approximately 10.2% which Is higher than one without use of STW.

• Journal of The Korean Society of Integrative Medicine
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• v.8 no.2
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• pp.41-51
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• 2020

Purpose : The purpose of this study was to determine the effect of scapulothoracic exercise and thoracic mobilization on shoulder pain and function in individulas with shoulder partial- thickness rotator cuff tear. Methods : Forty-five subjects were recruited and randomly divided into 3 groups of 15 subjects each : Scapulothoracic exercise with Thoracic mobilization (STwTM), Scapulothoracic exercise (ST), and Thoracic mobilization (TM) groups. All subjects were assessed for pain and disability of shoulder, thoracic angle base on the Shoulder Pain and Disability Index (SPADI) and Thoracic kyphosis assessment (TKA) using Baseline Bubble Inclinometer. All groups performed 50 minutes of the intervention twice a week for a total of six weeks. These tests were evaluated Three times : prior to the start of the intervention, after three weeks and, after six weeks had passed. Results : The SPADI score showed that pain and dysfunction in the STwTM group decreased compared to those in the other two groups. The TKA score showed a decrease over time in the ST, TM, and STwTM groups, in increasing order. However, the TKA score decreased significantly in the STwTM group compared to that in the oher two groups. Conclusion : ST and TM are effective in improving pain and dysfunction in patients. However, STwTM may be more effective for patients.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.736-741
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• 2004

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 disk drive, it is necessary to improve the writing accuracy during the STW(servo track writing) process through the reduction of TMR sources. Among the main contributors of the NRRO(Non-Repeatable Run-out) PES, the disk vibration and the HSA(head-stack assembly) vibration is considered to be one of the most significant factors. Also the most contributors of RRO(Repeatable Run- out) come from the contributors of NRRO which is written-in at the time of STW(servo track writing) process. In this paper, the experimental test result shows that the effect of NRRO on servo written-in RRO effectively can be reduced through a STW process under low dense medium condition such as semi-vacuum.

• Transactions of the Society of Information Storage Systems
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• v.3 no.1
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• pp.28-33
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• 2007

최근 Hard Disk Drive(HDD)는 컴퓨터 산업의 발달과 함께 멀티미디어 어플리케이션의 요구에 따라 대용량화 추세에 있다. 이러한 대용량 HDD 는 고밀도, 고정밀의 track 정보가 필요하게 되고, 이는 HDD 생산에 고속, 고정밀의 Servo Track Writer(STW)를 필요로 하게 되었다. 그러나, 기존의 STW 는 PID 제어기에 공진 모드 제거를 위한 notch filter 를 사용하기 때문에 고속화에는 한계가 있어 track 정보를 기록하는 생산시간의 단축이 어렵다. 본 논문에서는 이를 위하여 기존의 STW 에 공진 모드의 여기를 최소화하기 위해 제어 입력의 profile 을 설계하는데 convex optimization 을 이용한 최적화 기법을 사용하였다. 이렇게 설계된 제어 입력은 플랜트의 공진 모드가 존재하는 주파수 대역에 에너지를 최소화시켜 공진 모드의 영향을 적게 받는다. 그 결과로 빠른 settling time 과 위치 정밀도가 향상된다. 그 효과는 모의 실험을 통해 검증하였다.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.14 no.11
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• pp.1176-1181
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• 2004

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.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.6
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• pp.614-619
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• 2009

The STW(servo track writing) system which is the process of writing servo signals on disks before assembling in drives uses the spindle motor-chuck mechanism to realize low cost because the spindle motor-chuck mechanism has merit which can simultaneously write multi-disk by piling up disks in hub. Therefore, when the spindle motor-chuck mechanism of horizontal type operates in high rotation speed it is necessary to reduce the effect of RRO(repeatable run-out) and NRRO(non-repeatable run-out) to achieve the high precision accuracy of nano-meter level during the STW process. In this paper, we analyzed that the slip in assembly surfaces can be caused by the mechanical tolerance and clamping force in hub-chuck mechanism and can affect NRRO performance. We designed springs for centering and clamping considering centrifugal force by the rotation speed and assembly condition. The experimental result showed NRRO performance improves about 30 % than case of weak clamping force. The result shows that the optimal design of the spindle motor-chuck mechanism can effectively reduce the effect of NRRO and RRO in STW process.

• Journal of Convergence for Information Technology
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• v.11 no.4
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• pp.194-202
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• 2021

The leaves of Selaginella tamariscina were used for the treatment of many diseases in traditional medicine. In the study, antioxidant, anti-inflammatory, and wound healing activities of the hot-water extract(STW) and 80%ethanol extract(STE) obtained from S. tamariscina were evaluated. As a result, the polyphenol content of STW and STE were 38.108±0.766 mg/g and 17.927±1.064 mg/g, respectively. The DPPH and ABTS radical scavenging activities with the IC50 values of the STW were over 2 times lower than that of the STE. In the MTT assay, RAW264.7 cell viability of two extracts was decreased by about 6% at 1 mg/mL, whereas for HaCaT cell viability increased by 18% at 50 ㎍/mL. In addition, STW and STE suppressed the production of nitric oxide(NO), Tumor-necrosis(TNF)-��. COX-2 and PGE2 in lipopolysaccharide(LPS) induced RAW264.7 cells. Furthermore, the STE showed wound healing effect through the promotion of skin cell migration in TNF-�� stimulated human keratinocytes. These results indicated that the STW and STE have the potential to be used as a new cosmetic active ingredients in skin care.

• Journal of Korea Ship Safrty Technology Authority
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• s.35
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• pp.130-142
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• 2013

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.10a
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• pp.139-140
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• 2010

IMO는 해양사고의 80% 이상이 인적과실에 기인하고 있음에 관심을 갖고 ISM Code를 채택 시행하고 있으며, 이로 인해 해양사고의 발생률은 줄었으나, 여전히 인적과실이 해양사고의 주요 요인이 되고 있으며, 특히 선원의 피로가 기여하는 바가 크다는 점에 주목하였다. 이에 IMO STW전문위원회에서는 1999년 11월에 개최된 제21차 회의에서 채택된 안전승무기준에 관한 결의서 A.890(21)의 개정이 필요하며, 현행 SOLAS협약 상 각 체약국 정부가 자체적으로 정하여 시행하고 있는 최소안전승무기준을 통일시켜 국제적으로 일관된 기준에 따라 적절히 시행될 수 있도록 노력하고 있다. 이 논문은 IMO STW전문위원회 논의결과 마련된 최소 안전승무기준의 주요내용과 향후 전망에 대해 알아보도록 한다.

• Transactions of the Society of Information Storage Systems
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• v.7 no.2
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• pp.47-52
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• 2011

This paper presents a method to improve vibration characteristics of servo track write (STW) fixture. STW fixtures supported by flexible mounts are subject to various vibration sources. Using Finite element analysis (FEA) vibration modes of the fixture are identified. The FEA results suggest certain vibration modes be reduced through design change of flexible mounts to improve vibration responses of the fixture. Based on layered flexible mounts theory a parametric study on shear and bending stiffness is performed to obtain a suitable flexible mount design leading to increased resistance to rocking motion. Experiments confirm improvement of vibration characteristics and drive performance through new mounts design.