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한지훈,우상하,박유경,최성훈,이윤규,이정희,김재수,이현종,Han, Ji Hoon,Woo, Sang Ha,Park, Yu-kyeong,Choi, Seong-Hun,Lee, Yun-kyu,Lee, Jung Hee,Kim, Jae Soo,Lee, Hyun-Jong The Korean Medicine Society for the Herbal Formula 2021 大韓韓醫學方劑學會誌 Vol.29 No.4
This case study reports the effects of complex Korean medicine treatment, including Nangan-jeon, on Lambert-Eaton myasthenic syndrome (LEMS) accompanied by chronic constipation and abdominal pain as the main symptoms. A 39-year-old woman diagnosed with LEMS with major symptoms, including chronic constipation and acute abdominal pain, received Western treatment. The treatment efficacy was weak and symptoms recurred, so the patient received outpatient treatment and 13 days of hospitalization for active Korean medicine treatment, including Nangan-jeon. During outpatient treatment and hospitalization, defecation frequency and the numeric rating scale (NRS) for abdominal pain and abdominal cold feeling were measured. The NRS for abdominal pain and cold decreased from 8 at admission to 3 and 0, respectively, at discharge. Defecation frequency increased significantly from once or twice a month to once every 2-3 days during hospitalization. This study results that complex Korean medicine treatment, including Nangan-jeon may be useful for treating patients who mainly complain of autonomic neurological symptoms, among patients diagnosed with LEMS. In addition, it is believed that it could be basic data applicable to more LEMS patient treatment cases.
피부에 의한 이득 감쇠를 줄이기 위한 FEA 시뮬레이션 기반의 이식형 마이크로폰 설계 및 구현
한지훈,김민우,김동욱,성기웅,조성목,박일용,조진호,Han, Ji-Hun,Kim, Min-Woo,Kim, Dong-Wook,Seong, Ki-Woong,Cho, Sung-Mok,Park, Il-Yong,Cho, Jin-Ho 대한의용생체공학회 2008 의공학회지 Vol.29 No.1
Nowadays, implantable hearing aids have been developed to solve the problems of conventional hearing aids. In case of fully implantable hearing aids, an implantable microphone is necessary to receive sound signal beneath the skin. Normally, an implantable microphone has poor frequency response characteristics in high frequency bands of acoustic signal due to the high frequency attenuation effect of skin after implantation to human body. In this paper, the implantable microphone is designed to reduce the high frequency attenuation effect of a skin by putting its resonance frequency at the attenuated range through a finite element analysis (FEA) simulation. The designed implantable microphone through the simulated results has been fabricated by manufacturing process using bio-compatible materials. By the several in-vitro experiments with pig skin, it has been verified that the designed implantable microphone has a resonance frequency around the starting part of the attenuated range and reduces the attenuation effect.
신경가동술과 관절가동술이 경추 신경근병증 환자의 기능장애, 통증, 관절가동범위에 미치는 영향
한지훈,송창호,Han, Ji-Hun,Song, Chang-Ho 대한고유수용성신경근촉진법학회 2021 PNF and Movement Vol.19 No.3
Purpose: The study aimed to investigate the effects of neural mobilization with joint mobilization on dysfunction, pain, and range of motion in cervical radiculopathy patients. Methods: Forty-seven cervical radiculopathy patients were recruited for the study. The subjects were randomly allocated to three groups. Group A (n=16) received a neural mobilization with joint mobilization, Group B (n=15) received a neural mobilization (NM), Group C (n=16) received a joint mobilization (JM). All groups had five sets for a day, three days a week, for four weeks. All subjects were evaluated before and after intervention by their neck disability index (NDI), numeric pain rating scale (NPRS), and range of motion (ROM). Results: The results were as follows: First, the NDI was significantly decreased in all groups (p<0.05). Group A had more significantly decreased NDI than Group B and C (p<0.05). Secondly, the NPRS was significantly decreased in all groups (p<0.05). Group A had more significantly decreased cervical NPRS than Group B (p<0.05). Groups A and B were more effective at decreasing upper extremity NPRS than Group C (p<0.05). Thirdly, the ROM was significantly increased in all the groups (p<0.05). Group A had more significantly improved cervical rotation ROM than Group B (p<0.05). Significant short-term effects of the NM with JM on dysfunction, pain, and range of motion in cervical radiculopathy patients were recorded in this study. Conclusion: These findings gave some indications that it may be feasible to include NM with JM in interventions with cervical radiculopathy patients.
한지훈,전중환,김동주,장홍희,구자민,김영기,이스캇,김은정,이희천,이효종,연성찬,Han, Ji-hoon,Jeon, Jung-hwan,Kim, Dong-joo,Chang, Hong-hee,Koo, Ja-min,Kim, Young-ki,Lee, Scott-s,Kim, Eun-jung,Lee, Hee-chun,Lee, Hyo-jong,Yeon, Seong-chan 대한수의학회 2005 大韓獸醫學會誌 Vol.45 No.2
This study was carried out to find out how space allowance affect the social behavior of Korean native cattle (Bos taurus coreanae) steers. Twelve Korean native cattle (Bos taurus coreanae) steers were used as subjects, each of which was 30-month-old and observation period was from June to July 2003. Five (T1) and seven (T2) steers were allotted to two pens of $5m{\times}10m$ in a building with slate roof and open sides respectively. They were fed at 09:00 h and 16:00 h, twice a day. The behaviors of steers were recorded from 06:00 h to 17:00 h, using two color CCD cameras (Samsung SDC-411, Korea), one B/W CCD cameras (Samsung SBC-340, Korea), one multiplexer (Samsung SDM-081, Korea) and a time lapse VCR (Samsung SRV-30, Korea). The behaviors of each steer were recorded every 2 min using an instantaneous point sampling method. While the mean percentage of time budget in WA of T1 was lower than that of T2 (p<0.05), the mean percentage of time budget in SF of T1 was higher than that of T2 (p<0.05). When it gets hot, steers in T1 rested from 10:00 h to 14:00 h when it gets cool, showing 40~80% of LD rate while steers in T2 rested from 12:00 h, when it very hot to 17:00 h, showing 20~50% of LD rate, which is relatively low. Steers in T1 were fed from 06:00 h to 08:00 h when it was cool and from 16:00 h to 18:00 h, showing 20~45% of EA rate while steers in T2 were fed from 08:00 h to 14:00 h when it was hot, showing 25~50% of EA rate. In conclusion, it turned out that the number of steers affected their social behavior, and T1 was better environment than T2 in terms of welfare.
일반화된 마찰강성행렬의 민감도를 이용한 스퀼 소음 저감 연구
한지훈(Ji-Hoon Han),김정태(Jung-Tae Kim),박경환(Kyoung Hwan Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In spite of many squeal noise studies, it is still hard to predict squeal noise these days. Squeal analysis is a useful technique in reducing or removing squeal noise. As a result, several papers that contain reasonable finite element model with correlation, squeal mode analysis, and design proposals that can reduce the squeal noise have been released. In this paper, Generalized Frictional Stiffness Matrix was extracted using Generalized Coordinate in ABAQUS. GFSM(Generalized Frictional Stiffness Matrix) is an unsymmetrical matrix which creates a real-eigen-value (unstable mode) in complex eigenvalue problem. Then, sensitivity of each term in GFSM is calculated. The least modification was proposed from the sensitivities to reduce the squeal noise. To verify this proposal, a reasonable finite element model was generated by correlating component and assembly modal tests. In processing correlation with component modal test, MAC(Modal Assurance Criteria) was used as a reference value for mode shape correlation.
회생 제동 에너지 회수율 최대화 및 차량 안전성 보장을 위한 하이브리드 연료 전지 자동차의 회생 제동 협조 제어
한지훈(Jihun Han),박영진(Youngjin Park),박윤식(Youn-sik Park),유성필(Seongpil Ryu),최서호(Seo-ho Choi) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
One of the most important control problems to improve fuel economy in fuel cell hybrid electric vehicle is cooperative regenerative braking control strategy because the electric motor can convert the kinetic or potential energy into electric energy that can be stored in super-capacitor and reused. In this study, an electric motor for regenerative braking is directly connected to the front drive axle only because front-wheel drive vehicle is common for passenger vehicle. Vehicle stability can be lost in case regenerative braking torque is applied only to front wheels for maximum braking energy recovery, i.e., FCHEV might get into an unstable motion called lock-up and understeer. Therefore, we propose systematic controller guaranteeing the vehicle stability while guaranteeing maximum regenerative braking energy recovery. Upper controller generates the desired yaw moment calculated by using LQR method for following the desired the yaw rate and side slip angle. And lower controller applies optimal regenerative braking torque and mechanical braking torque independently within equality constraints (the required total longitudinal force and yaw moment) and inequality constraints (friction circle) for optimal regenerative braking energy recovery. Carsim™ computer simulation is used to verify the effectiveness of the proposed controller.