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RISS 인기검색어
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- 저자 : Yeonwoo Ku (검색결과 4 건)
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An Optimum Current Mirror Ratio for Low Phase Noise LC–VCO
Yeonwoo Ku,Seong Hwan Cho IEEE 2008 IEEE microwave and wireless components letters Vol.18 No.12
<P>A design technique for a low phase noise inductor- capacitor voltage-controlled oscillator (VCO) using an optimum current ratio between the oscillating core and the bias circuit is proposed. Conventionally, it is preferred that the current in the oscillating core is maximized to reduce the phase noise. In this letter, however, we find that an optimum current ratio exists for low phase noise for a given power budget. To find the optimum ratio, a theoretical analysis is performed and verified by a prototype VCO using a 0.13 mum CMOS process. Based on the analysis and the measured data, the optimum ratio is shown to be 2 ~ 3.</P>
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Ku Sang Kim,Jangmoo Byeon,Jinhyuk Choi,Sungui Jung,Yeonwoo Kim,Junyong Jekal,Chang-Wan Jeon 대한종양외과학회 2021 대한임상종양학회 학술대회지 Vol.2021 No.6
Background/Aims Digital breast tomosynthesis (DBT)-guided stereotactic biopsy is increasingly used in practice. It is important to know usefulness of this innovative practice in procedure time, anesthesia, reoperation rates, and incision size compared with conventional surgical excision under digital mammography (DM)-guided hook wire localization. To compare biopsy procedure time, pathologic results, and reoperation rates for 2 years preceding of surgical excision and 6 months following implementation of DBT-guided stereotactic biopsy. Methods All conventional surgical excision under DM-guided hook wire localization from a single university hospital breast center from July 2018 to August 2020 from DBT-guided 9-gauge vacuum-assisted stereotactic biopsies from October 2020 to March 2021 were retrospectively reviewed. All procedures were done by breast surgeons not radiologist. All mammographic examinations were performed with DBT. Patient demographics, biopsy target type, pathologic reports, procedure time, type of anesthesia, surgical excision specimens when available, imaging follow-up results were recorded. Pathologic findings, procedure time, and reoperation rates between two different procedures were compared. Results A total of 42 women underwent breast biopsies: 22 by conventional surgical excision under DM-guided hook wire localization (July 2018 to August 2020) (median age, 52 years; interquartile range, 49–66 years) and 20 by DBT-guided 9-gauge vacuum-assisted stereotactic biopsies (October 2020 to March 2021) (median age, 48 years; interquartile range, 40–57 years), (P = .58). Microcalcifications were the most common biopsy target for both groups, constituting 92% (20 of 22) conventional surgical excision under DM-guided hook wire localization and 100% (20 of 20) of DBT-guided 9-gauge vacuum-assisted stereotactic biopsies (P = .32). The rate of architectural distortion biopsies was 8.0% (2 of 22) with conventional surgical excision under DM-guided hook wire localization and no case with DBT-guided 9-gauge vacuum-assisted stereotactic biopsies. Although overall malignancy rate was similar for conventional surgical excision under DM-guided hook wire localization (31.8% [7 of 22]) and DBT-guided 9-gauge vacuum-assisted stereotactic biopsies (25% [5 of 20], P = .54), Procedure time was different for conventional surgical excision under DM-guided hook wire localization (mean 95 minutes for surgery time 62 minutes, and hook wire localization time 33 minutes) and DBT-guided 9-gauge vacuum-assisted stereotactic biopsies (mean 16 minutes). Reoperation rate for malignant lesion were 29% (2/7) in conventional surgical excision under DM-guided hook wire localization but 0% (0/5) in DBT-guided 9-gauge vacuum-assisted stereotactic biopsies. And conventional surgical excision under DM-guided hook wire localization was performed under general anesthesia but, DBT-guided 9-gauge vacuum-assisted stereotactic biopsies was performed under local anesthesia. Omission rate for surgery was 70% (14/20) in DBT-guided 9-gauge vacuum-assisted stereotactic biopsies. Conclusions With the transition to digital breast tomosynthesis–guided stereotactic biopsy, procedure time was enormously decreased and procedure was possible in local anesthesia. DBT-guided 9-gauge vacuum-assisted stereotactic biopsies was accurate, minimally invasive and simple procedure with merits for short procedure time and local anesthesia furthermore omission of surgery.
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Purpose, Procedure, and Contents of Counseling according to Tinnitus Interventions
Soon-Je Choi,Minseung Ku,TaeRim Lee,YeonWoo Sim,Jeeun Yoo,Nor Farawaheeda Ab Shukor,Yerim Shin,In-Ki Jin 한국청각언어재활학회 2021 Audiology and Speech Research Vol.17 No.2
Tinnitus refers to the perception of ringing sounds in the ear that are not heard by others. Counseling plays a vital role in tinnitus intervention. Counseling provides correct information about tinnitus and hearing loss, corrects any misunderstandings related to tinnitus, and suggests precise alternative interventions for tinnitus. In this review, we aimed to examine the counseling contents in Tinnitus Retraining Therapy (TRT), Cognitive Behavioral Therapy (CBT), and Tinnitus Activities Treatment (TAT) to identify information that could be useful for counseling approaches and contents for the various tinnitus intervention methods. We searched Web of Science, Embase, Science Direct, and PubMed for relevant articles. Of the 5,283 articles, 31 were included in the final review of counseling contents for TRT, CBT, and TAT. Based on our findings, we were able to summarize the main contents of counseling in TRT, CBT, and TAT. Although the contents of counseling may vary depending on the individuals with tinnitus, our review provided information that may help audiologists or hearing professionals further understand the fundamentals of counseling for each tinnitus intervention. Our review may serve as a guideline for tinnitus counseling according to tinnitus interventions.
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