근전도 생체되먹임 훈련이 봉우리밑 충돌증후군 환자의 등세모근 근활성도에 미치는 즉각적인 효과

정종철,안다인,윤소희,이재승,김수용,Jung, Jong-Chul,An, Da-In,Yoon, So-Hee,Lee, Jae-Seung,Kim, Soo-Yong 대한고유수용성신경근촉진법학회 2020 PNF and Movement Vol.18 No.1

Purpose: To investigate the effects of electromyography (EMG) biofeedback on the muscle activity of the trapezius, shoulder pain, function, and range of motion (ROM) in patients with subacromial impingement syndrome (SAIS). Methods: Sixteen patients (9 males and 7 females) with SAIS participated voluntarily. The main outcome measures were muscle activity of the trapezius, shoulder pain (VAS), ROM, and the shoulder pain and disability index (SPADI). Exercises with EMG biofeedback consisted of shoulder flexion in a standing position, shoulder external rotation in a side-lying position, and shoulder horizontal abduction in a prone position. Post measurements were taken immediately after EMG biofeedback training. Results: Middle and lower trapezius activity, as well as ROM, was significantly increased by exercise with EMG biofeedback (p<0.05). In addition, VAS and SPADI scores significantly decreased post-EMG biofeedback training (p<0.05). Conclusion: EMG biofeedback intervention is an effective exercise for SAIS patients to restore activity of the middle and lower trapezius and to improve pain, shoulder function, and ROM.

입력관측기의 정량적 성능지표 (I) -과도상태 해석-

정종철,이범석,허건수,Jung, Jong-Chul,Lee, Boem-Suk,Huh, Kun-Soo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.10

The closed-loop state and input observer is a pole-placement type observer and estimates unknown state and input variables simultaneously. Pole-placement type observers may have poor transient performance with respect to ill-conditioning factors such as unknown initial estimates, round-off error, etc. For the robust transient performance, the effects of these ill-conditioning factors must be minimized in designing observers. In this paper, the transient performance of the closed-loop state and input observer is investigated quantitatively by considering the error bounds due to ill-conditioning factors. The performance indices are selected from these error bounds and are related to the observer robustness with respect to the ill -conditioning factors. The closed-loop state and input observer with small performance indices is considered as a well-conditioned observer from the transient perspective.

비정규지표를 이용한 Well-Conditioned 관측기 설계

정종철,허건수,Jung, Jong-Chul,Huh, Kun-Soo 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6

In this paper, the well-conditioned observer is designed to be insensitive to the ill-conditioning factors in transient and steady-state observer performance. A condition number based on 12-norm of the eigenvector matrix of the observer matrix has been proposed on a principal index in the observer performance. For the well-conditioned observer design, the non-normality measure and the observability condition of the observer matrix are utilized. The two constraints are specified into observer gain boundary region that guarantees a small condition number and a stable observer. The observer gain selected in this region guarantees a well-conditioned and observable property. In this study, this method is applied to the Luenberger observer and Kalman filters for small order systems. In designing Kalman filters, the ratio of the process noise covariance to the measurement noise covariance is a design parameter and its effect on the condition number is investigated.

특발성 측만증의 진단에 사용되는 WRVAS와 SRS-22의 상관관계

정종철 ( Jong Chul Jung ),박민철 ( Min Chull Park ),이근희 ( Keun Heui Lee ),김형수 ( Hyoung Su Kim ),이수경 ( Su Kyung Lee ),구봉오 ( Bong Oh Goo ) 대한물리의학회 2009 대한물리의학회지 Vol.4 No.1

Purpose Purpose of this study was to determine correlation between Walter Reed Visual Analogue Scale (WRVAS) and Scoliosis Research Society-22(SRS-22) questionnaire for idiopathic scoliosis. Methods For this study, to assess reliability, 224 middle school female students were applied the WRVAS & SRS-22 questionnaire. Pearson correlation analysis was used to know correlationship between WRVAS and SRS-22 questionnaire. Regression analysis was used to know causation between WRVAS and SRS-22 questionnaire. Results Positive correlation(.248) was found between WRVAS score and SRS-22 score. And SRS-22 was shown positive correlation compared with WRVAS as a result slope of .078 Conclusion The WRVAS questionnaire is reliable positive correlation with SRS-22 questionnaire. It is valid and may be useful for clinical evaluation of idiopathic scoliosis patients.

유기절연박막의 알킬체인 길이에 따른 전기적 특성

정종철(Jong-Chul Jung),최용성(Yong-Sung Choi),황종선(Jong-Sun Hwang),이경섭(Kyung-Sup Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4

The physicochemical properties of the fatty acid monomolecular Arachidic Acid, Stearic Acid films surface structure has been studied by AFM. We give pressure stimulation into organic thin films and then manufacture a device under the accumulation condition that the state surface pressure is gas state, liquid state, solid state. Formation that prevent when gas phase state and liquid phase state measure but could know organic matter that molecules form equal and stable film when molecules were not distributed evenly, and accumulated in solid state only.

타이어 힘 추정 방식들의 성능 비교

정종철(Jong-Chul Jung),김준영(Joon-Young Kim),허건수(Kun-Soo Huh) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.2

On-line and real-time information of the road/tire interaction is the essential factor not only from the vehicle monitoring viewpoint but also for the Advanced Vehicle Control Systems(AVCS) approach. In particular, their interactions are known to be closely related to the tractive ability, handling stability, steerability and braking characteristics of ground vehicles. The key variables representing the interactions can be tire-road friction coefficient and the longitudinal/lateral forces acting on the tires. However, it is not feasible in the operating vehicles to measure those variables directly because of high cost of sensors, limitations in sensor technology, interference with the tire rotation and harsh environment. The alternative is indirect sensing techniques which can estimate the key variables such as tire forces based on vehicle dynamics models. In this paper, in order to estimate the tire forces, three monitoring systems are developed based on the Recursive Least Square, Extended Kalman Filter and Adaptive Observer, respectively. A 14 DOF vehicle model with a combined-slip Magic Formula tire model is utilized in order to generate true vehicle motion. The lateral forces acting on the tires are estimated using those monitoring systems and their estimation accuracy is compared with the real values.<br/>

X帶域 마이크로스트립 디스크 안테나에 關한 硏究

鄭宗哲(Jong Chul JUNG),李鍾岳(Jong Arc LEE) 한국통신학회 1983 韓國通信學會論文誌 Vol.8 No.2

내시경을 이용하여 경접형동 접근술로 치료한 여포 자극 호르몬 분비 뇌하수체 샘종

정종철(Jong Chul Chung),김승민(Seong Min Kim),정성삼(Sung Sam Jung),정승영(Seung Young Chung),김병준(Byung Joon Kim) 대한두개저학회 2007 대한두개저학회지 Vol.2 No.2

Follicle-stimulating hormone-secreting pituitary adenomas are rarley diagnosed and likely considered as a non-functioning pituitary tumor. Because they usually do not present until of sufficient size to cause neurologic deficits by mass effect or hypopituitarism, whereas other functioning tumors - acromegaly, prolactinoma, Cushing s disease - frequently present earlier with symptoms caused by physiologic effects of excess hormones that they secrete. 62-year-old man suffered from visual disturbance. Endocrinologic evaluation showed high serum FSH level. Suprasellar extended pituitary mass with compression to optic chiasm & cavernous sinus was imaged on MRI and removed by endoscope assisted endonasal transsphenoidal surgery. It was composed of gonadotroph showed strong immunohistochemical reactivity against FSH and LH. Uncommon pituitary tumors such as FSH-secreting adenomas can be defined early and accurately through correlation between their clinical, endocrionological, radiographic and immunohistochemical characteristics.

시화호와 연안해역의 부유사 분포 분석을 위한 원격탐사 알고리듬

정종철(Jong Chul Jeong),유신재(Sin Jae Yoo),김정욱(Jung Wook Kim) 한국지리정보학회 1999 한국지리정보학회지 Vol.2 No.2

The study for detecting suspended sediment distribution in Lake Sihwa, which has a large surface area and coastal area, suing remote sensing technique was carried out with development of satellite data collected since 1970. The research, however, analysi

임상 : 사대 척삭종의 수술 치료에 대한 비교 분석; 내시경을 이용한 경접형동 접근법의 유용성

정종철 ( Jong Chul Chung ),김승민 ( Seong Min Kim ),정성삼 ( Sung Sam Jung ),박기석 ( Ki Seok Park ),박문선 ( Moon Sun Park ),김한규 ( Han Kyu Kim ) 대한뇌종양학회 2009 대한뇌종양학회지 Vol.8 No.2

Objective:Chordomas, whether involving the clivus or simply situated anterior to the brainstem, present a technical challenge for adequate exposure and safe resection. Transsphenoidal approach is safer and easier than any other approaches, but it has some limitation of resectability in laterally extended tumor. The objective of this paper is to demonstrate the advantages of endoscope assisted transsphenoidal approach to remove paraclival lesion on the midline. Methods:Nine patients with clival chordomas underwent surgery in our institution from 2002 to 2009. There were two men and seven women who ranged in age between 4 and 59 years. Four patients underwent stage operation by both transsphenoidal surgery and transpetrosal or transcavernous surgery. Three patients underwent only transsphenoidal surgery and two underwent only transpetrosal surgery. For image guidance, both endoscope and neuronavigation system were used in all surgical procedures. Results:Gross total removal was achieved in 33.3% and subtotal removal was achieved in 55.5%. The mean follow-up period was 44.2 months. The mortality rate during the follow-up period was 11.1%. Conclusion:For accessing clival chordoma via an anterior route, visualization of the tumor with the endoscope and navigation system is readily achievable and have the advantages of confirmation the anatomy that cannot be seen in the conventional transsphenoidal approach. This study shows transsphenoidal approach become safer and easier if the tumor is located on upper two thirds of the clivus and located on the midline.