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자동차용 솔레노이드 밸브의 Nd:YAG 레이저 용접 특성에 관한 연구
지수환(Suhwan Ji),권오균(Okyun kwon),강동포(Dongpo Kang),최성용(Sungyoung Choi),김인호(Inho Kim) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
ABS (Anti-lock Brake System), TCS (Traction Control System), ESP (Electronic Stability Program) are the brake system which make vehicles more be safety. In order to fulfill the control of vehicle, those systems use a fluid control system ABS consists of several parts such as HU (Hydraulic Unit), ECU and sensors. Especially, solenoid valves operate the fluid pressure control by magnetic force. Generally, the high pressure is worked on hydraulic unit including solenoid valves. In order to shield between sleeve and housing which play an important part in solenoid valve, Nd:YAG laser welding was performed Welding parnmeter such as power, welding speed, repetition rate, pulse width were varied in this experiment The optimwn welding condition observed 47W power, 3.5 ms pulse width, 12 Hz frequencies. Hot cracks that have an effect on a mechanical performance were not observed in the weld metal. Burst test showed that all welded specimens were satisfied at the specification of solenoid valve.
지수환(Su Hwan Ji),서혜선(Hae Sun Seo) 대한모유수유한의학회 2022 nipple confusion,breastfeeding consultation,IBCLC, Vol.3 No.1
Objectives: The purpose of this study is to determine whether or not herbal medicines can induce precocious puberty. Related studies were reviewed on ginseng, which has been pointed out as a risk factor owing to estrogenic activity. Methods: Pubmed, Google Scholarship, UptoDate Scholastic, and RISS were used as search sources. A combination of ‘precocious puberty’, ‘early puberty’, ‘herbal medicine’, ‘Korean medicine’, ‘ginseng’, and ‘ginsenoside’ was used as a search term. Without regard to the year of publication, literature in both Korean and English was examined. Results: Ginseng exhibits potent estrogen-like effects in in vitro studies; however, in vivo studies show that estrogen-like effects only appear in high doses of ginseng extracts. There is no clear evidence of the potential for ginseng to induce precocious puberty. Rather, ginseng has a positive effect on preventing precocious puberty through its anti-obesity and protective effect on bisphenol A. Conclusions: Since the estrogen-like effects of ginsenoside were observed only at high doses in in vivo studies, more detailed and well-designed studies are needed in the future. Ginseng may not cause precocious puberty if prescribed under the diagnosis of Korean medicine doctor, and can be a viable option for the treatment of precocious puberty.
임현승,이건희,이상화,지수환,김아욱 대한전기학회 2022 전기학회논문지 Vol.71 No.9
This paper compares the performance of five commercial speech recognition APIs under noisy environments, namely those provided by Amazon AWS, Microsoft Azure, Google, Kakao, and Naver. To this end, we used an open dataset for development and evaluation of multi-channel noise processing technology provided in AI Hub. We tested each API’s performance with respect to the speaker’s gender and location and the speech content, and measured their error rate using both word error rate (WER) and character error rate (CER). Except for the AWS API, the error rate was higher when tested with female’s data than male’s one, and when tested with the data recorded from the side than the front. The error rate was also relatively high when the test sentences contained proper nouns such as person’s names and local names, and the shorter the sentences, the higher the error rate. Moreover, the Google API outperformed all the others in terms of both WER and CER, with 53% and 18% of error rate, respectively
한의사 대상 온라인 설문조사를 통한 안면부 매선침 임상 활용 현황 조사
유승호,서준원,김세윤,임정현,지수환,김병찬,남상수,구본혁,김고운,조재흥,송미연,정원석,김형석,신우철 한방재활의학과학회 2024 한방재활의학과학회지 Vol.34 No.2
Objectives This study aims to report current status and strategies of thread embedding acupuncture (TEA) on face through survey of Korean medicine doctors. Methods The survey was conducted online via e-mail to certified Korean medicine doctors. The questionnaire is developed by Korean medicine doctors in Kyung-Hee Korean Medicine Hospital at Gangdong. The survey mainly consisted with multiple- choice questions on the current status, cost, and adverse reactions. Results TEA was predominantly utilized for cosmetic purposes, and the billing cost was commonly determined based on the number of threads used. The reported incidence of adverse reactions during TEA was 69.9%. The most frequent self-resolving adverse reaction was bruising, while the most common adverse reaction requiring medical intervention or resulting in sequelae was the ‘dimple phenomenon’. According to the questionnaire, the primary factor associated with adverse reactions was the treatment area. Conclusions This study provided insights into the practical use of TEA on face in Korean medical clinic.
턱관절 장애 치료 시 매선침 활용 현황에 대한 설문 연구
유승호,강준혁,서상우,서준원,김세윤,임정현,지수환,전현준,남상수,구본혁,김고운,조재흥,송미연 한방재활의학과학회 2023 한방재활의학과학회지 Vol.33 No.3
Objectives This study is for reporting current status and strategies of thread embedding acupuncture (TEA) in temporomandibular joint disorder (TMD) using web-based survey. Methods Survey was conducted online via E-mail among Korean medicine doctors registered with the Association of Korean Medicine. The questionnaire is developed by Korean medicine doctor in Kyung Hee University Hospital at Gangdong. The survey consisted mainly of multiple-choice questions on the current status and strategies of TEA for TMD. Results Total of 427 doctors responded. TEA was mostly used for ‘Cosmetic purpose and others’ with 287 respondents (67.2%), and 102 respondents (23.9%) having experience with TEA for TMD. The most common purpose for TEA for TMD was ‘Improving muscle contraction and tension’ with 290 respondents (67.9%). The average interval was reported 2.12 weeks, and the most common response for the number of treatments was five sessions with 127 respondents (29.7%). The most common criterion for determining the treatment site was based on anatomical structure, accounting for 92.7%. The most effective anatomical structure was the ‘Masseter muscle’ with 83.1%, followed by the ‘Temporal muscle’ with 51.8%. TEA direction for TMD was dominant in ‘affected side’ for all muscles. Conclusions Through a survey, we can investigate clinical usage of TEA for TMD. This study can be helpful in creating standardized criteria for TEA on TMD in the future.