앉고 일어서기 동작에서 점진적 체중 이동을 이용한 시각적 되먹임 훈련이 만성 편마비 환자의 균형 및 보행능력에 미치는 영향

김경환,박성훈,김형민,박노욱,김다연,Kim, Kyung-hwan,Park, Sung-hoon,Kim, Hyung-min,Pak, Noh-wook,Kim, Da-yeon 대한고유수용성신경근촉진법학회 2017 PNF and Movement Vol.15 No.1

Purpose: This study aimed to investigate the effect of visual feedback training-for gradual weight shift in sit-to-stand training-on the balance and walking abilities of chronic hemiplegia patients. Methods: Twenty patients with chronic hemiplegia volunteered to participate in this study. The experimental group received visual feedback for gradual weight shift in the sit-to-stand training, while the contrast group followed the standard process for the sit-to-stand training. The evaluation of the balance and walking ability was conducted with the functional reach test (FRT), Berg balance scale (BBS), five time sit-to-stand (FTSTS) test, timed up and go (TUG) test, 10 m walk test (10MWT), balancia, activities-specific balance confidence (ABC) scale, and falls efficacy scale (FES). Results: In the results before and after intervention, there was a significant difference in TUG, 10MWT, ABC, and FES in the visual feedback training group (p < 0.05). In the control group, there was a significant difference in the 10MWT and ABC (p < 0.05). Also, in the evaluation of the postural fluctuations, the control group data showed a significant increase in Covar. The visual feedback group showed a significant difference in the W average. Conclusion: The visual feedback training group showed some improvement in terms balance and walking ability and on the ABC scale and FES. Therefore, if the diagonal progressive weight bearing exercise is combined with the various patterns and basic principles of PNF, it may be a more efficient intervention method.

수직자기기록용 박막의 제작

김경환,김명호,손인환,김재환 ( Kyung Hwan Kim,Myung Ho Kim,In Hwan Son,Jae Hwan Kim ) 한국전기전자재료학회 1997 한국전기전자재료학회 추계학술대회논문집 Vol.1997 No.1

CPM Bar Chart 기법을 활용한 일정계획

김경환,김수유,김재준,Kim Kyung-Hwan,Kim Soo-Yoo,Kim Jae-Jun 한국건설관리학회 2004 건설관리 : 한국건설관리학회 학회지 Vol.5 No.5

본 연구에서는 바차트(bar chart) 기법과 CPM 기법의 장점을 결합한 CPM bar chart(CBC) 기법을 제시한다. CBC는 기존의 fenced bar chart(FBC)의 장점을 유지하면서 단점을 보완한 것으로, 작업 관계를 나타내는 fence에 방향성을 부여함으로써, 기존 FBC에서 상당한 혼란을 유발하는 fence의 분리과정 없이 작업들의 관계를 표현할 수 있다. 또한, fence의 분리를 파악하기 위해 더미작업(dummy activity)을 확인하는 과정이 생략되어 보다 손쉽게 작성할 수 있는 장점도 있다. 바차트의 간결성을 유지하면서 CPM의 네트워크 논리 표현이 가능해짐에 따라, CBC는 다양한 프로젝트 참여자들 간의 원활한 의사소통에 기여하리라 예상된다. 또한, resource constrained scheduling, resource leveling, 작업 분리가 고려된 일정 조정, 공기 지연 분석 등의 CPM 기법에 기초한 다양한 일정 계획 및 관리에도 적용이 용이하여, 실무뿐만이 아니라 공정관리 교육과정에서도 활용성이 높으리라 기대된다. This paper proposes the CPM bar chart (CBC), a hybrid of the bar chart and the critical pad method (CPM). The CBC overcomes shortages of the fenced bar chart, while still keeping advantages. The fence with direction is applied instead of the broken fence, which triggers considerable problems to identify and apply in the fenced bar chart. In addition, the notorious task to find dummy activities is no longer required. Upon the benefits of simplicity in the bar chart and logical work sequence in the CPM network. the CBC provides a relatively easy way to create and understand a schedule, thus improving communication quality between project participants. With the advantages, the CBC can also be effectively applied to various scheduling techniques such as resource constrained scheduling, resource leveling, scheduling with activity split, delay impact analysis, etc.

베체트씨병에 의한 대동맥판 폐쇄부전의 수술적 치료

김경환,김기봉,김원곤,김주현,안혁,Kim, Kyung-Hwan,Kim, Ki-Bong,Kim, Won-Gon,Kim, Joo-Hyun,Ahn, Hyuk 대한흉부심장혈관외과학회 2000 Journal of Chest Surgery (J Chest Surg) Vol.33 No.5

Background: Cardiac involvement of Behcets disease is very rate, however, the prognosis of Behcet disease depends on cardiovascular complications. In this article, we described surgical treatment of aortic insufficiency with Behcets disease. Material and Method: From March 1986 to February 1998, we operated on 10 patients of aortic insufficiency with Behcets disease. Male to female ratio was 8 to 2, and age ranged from 21 to 40 years(mean 32.8 years). There were 8 patients with evidence of Behcets disease and another 2 patients had some suspicious findings of Behcets disease(i.e., prosthetic value dehiscence, hypertrophied aortic wall). Adequate preoperative medical treatment for Behcets disease was done in 3 patients. Result: We performed 24 open heart surgeries in 10 patients. Redo value replacements using prosthetic valves were done in 4 patients. Among them, 2 patients were operated on for a second redo valve replacement and one of them operated on for a 4th and 5th operation because of recurrent paravalvular leakage. These 4 patients expired. 1 patient who had undergons tissue value replacement is alive. 1 patient who underwent Cabrol operation expired dut to rupture of graft anastomosis site. We used homografts in 3 patients. In 2 of them, we performed aortic root replacement and subcoronary valve replacement in another patient. The patient who underwent subcoronary valve insertion had remnant aortic insufficiency, so we are closely observing him. We also performed Ross operation in a 24 year old female who suffered severs aortic insufficiency and endocarditis after aortic valvuloplasty. 5 patients are alive and mean follow up duration is 49.0 months. Among them, we used homografts or sutografts in 4 patients. We could observe excellent clinical results in the patients who underwent aortic root replacement using homograft and they were treated medically for Behcets disease. Conclusion: We concluded that adequate preporative diagnosis, clinical suspicion, and periopertive medical treatment for Behcets disease are very important for the result of surgical management of aortic insufficiency with Behcets disease. The use of homograft or autograft was helpful for the healing of anastomosis site and we should carefully observe the long term follow up results.

고양지역 두 병원에서의 약물 중독 양상

김경환,박준석,신동운,노준영,김혜진,구홍두,조진경,김아진,Kim Kyung-Hwan,Park Jun-Soek,Shin Dong-Wun,Rho Jun-Young,Kim Hey-Jin,Gu Hong-Du,Cho Jin-Kyung,Kim Ah-Jin 대한임상독성학회 2006 대한임상독성학회지 Vol.4 No.1

Purpose: In the year of 2005, it enforced the basic study for establishing program of Poison Control Center by National Institute of Toxicologic Research. The object of our survey is to analyze the characteristics of intoxication from the City of Goyang by same protocol. Methods: We retrospectively reviewed the data of medical records of the intoxication patient in the two hospitals of the Goyang from 2004 June 1st to 2005 May 31th. The investigation protocol applied the TESS report form which was used from the Basic study for establishing program of Poison Control Center. Results: The intoxication patients were total 269 persons, the patients of A hospital were 184 persons, B hospital were 185 persons. The most common intoxication materials were medicines, in afterwords it was an agricultural chemical. The most common place of intoxication was the home. The intentional suicidal attempts in the reason of intoxication were 51.2%. The rate of the patients who discharges from the emergency department was 50.4% and death rate was 4.3%. Conclusion: We concluded that the continuous and systemic report and analysis should be accomplished from the Goyang area.

의미론적인 단순화된 그림 및 표의문자를 인지하는 과정에 대한 fMRI 연구

김경환,이성기,송명성,권민정,정준영,박현욱,윤효운,Kim Kyung Hwan,Lee Sung Ki,Song Myung Sung,Kwon Min Jung,Chung Jun Young,Park Hyun Wook,Yoon Hyo Woon 대한자기공명의과학회 2003 Investigative Magnetic Resonance Imaging Vol.7 No.2

문자와 그림을 인식하는데 있어 인식패턴의 반구차이는 인지심리학적으로 널리 연구되어왔고 또 증명되어졌다. 일반적으로 그림을 인식하는 있어서는 우반구 우세를 문자를 인식하는 있어는 좌반구 우세를 이야기하는데 본 논문에서는 그 사실을 바탕으로 fMRI 연구를 진행하였다. 동양문화권에서 문자로 사용되고 있는 한자 역시 그림으로 인식한다는 견해가 있다는 것이다. 한자의 인지가 좌반구 또는 우반구 우세라는 엇갈린 견해들이 있다. 그래서 본 논문에서는 한자와 그림의 인식패턴에 대한 반구차이 및 활성화되는 두뇌의 영역을 규명하기 위해 비교 실험하였다. 자극으로 사용되어진 그림은 한자와 동일한 의미를 가진 단순화된 것이다. 실험 디자인은 일반적으로 사용되는 블록디자인을 사용하였고 SPM을 사용하여 분석하였다. 결론으로 한자와 그림 인식패턴 모두 반구우세성을 이야길 할 경우 시각영역인 후두엽 및 측두엽 부분에서는 우반구 우세가 보이지만 일반적으로 반구우세성을 이야기하기는 무리가 있는 것 같다. The different perceiving patterns of each picture, alphabetic words and Chinese characters, were widely investigated psychophysically. The more precise localisation can be done in terms of brain activity us-ing functional image technique such as PET and fMRI recently, Until now, there was no fMRI study to make direct comparison between perception of single Chinese character and simplified pictures (pictograph). We have made direct comparison of these two components using modern magnetic resonance techniques. We cannot confirm the right hemispheric dominance for perception of single Chinese character and pictographs. These two kinds of perceiving pattern can be underlying different mechanism.

요구사양서의 품질평가 모델에 관한 연구

김경환,코지마 츠토무,박용범,Kim Hyong-Hwan,Kozima Tsutomu,Park Young B 한국정보처리학회 2004 정보처리학회논문지D Vol.11 No.7

소프트웨어 응용 분야의 확대로 인해, 소프트웨어는 더 크고, 더 복잡해지고 있다. 게다가 개발 기간의 단축 및 비용의 절감${\cdot}$품질의 향상 또한 요구되고 있다. 이러한 요구를 충족시키기 위해 여러 효율적인 방법이 제안되었고, 구현되었다. 대표적으로 프로세스 개선과 객체지향 개발, 요구공학, 소프트웨어 메트릭스 등이 있다. 이러한 수많은 방법 중에서 요구공학은 고품질의 소프트웨어 개발의 기반이 된다. 즉, 고품질의 소프트웨어를 개발하기 위해서는 먼저 요구를 획득하고, 기술하여야 하며, 이에 대한 검증과 관리를 통해 요구사양서의 품질을 향상시켜 가야 한다. 본 논문에서는 IEEE Std-830-1998의 좋은 요구사양서가 가져야 할 특성을 중심으로, 요구사양서에 기술된 내용 자체를 정량적으로 품질 평가할 수 있는 메트릭스를 제안하였다. As the area of software application is increased. the software is becoming larger and more complex. In addition, development of the high quality software within the limits of the budget is strongly demanded. Many methodologies, such as software process improvement, object-ori-ented development, requirement-engineering, and software metrics have been introduced in the software development process in order to attain such objectives. Among those techniques. Requirements-Engineering gives basic guideline to develop high quality software. In other word. in order to develop high quality software, requirements should be elicited, and described. And with proper reviews and management. the quality of requirements can be improved. In this paper, quantitative measurement method that is based on IEEE Std-830-1998 for the require-ment-specifications is proposed.

산화물기반 박막트랜지스터 전극용 ITO박막의 제작시 투입 산소 분압 의존성

김경환,Kim, Kyung Hwan 한국반도체디스플레이기술학회 2021 반도체디스플레이기술학회지 Vol.20 No.2

In this study, we investigated the oxygen partial pressure effect of ITO films for electrodes of oxide-based Thin-Film Transistor (TFT). Firstly, we deposited single ITO films on the glass substrate at room temperature. ITO films were prepared at the various partial pressures of oxygen gas 0-7.4% (O₂/(Ar+O₂)). As increasing oxygen on the process of film deposition, electrical properties were improved and optical transmittance increased in the visible light range (300-800 nm). For the electrode of TFT, we fabricated a TFT device (W/L=1000/200 ㎛) with ITO films as the source and drain electrode on the silicon wafer. Except for the TFT device combined with ITO film prepared at the oxygen partial pressure ratio of 7.4%, We confirmed that TFT devices with ITO films via FTS system operated as a driving device at threshold voltage (V_th) of 4V.

질산철 처리에 의한 염색견사의 후매염에 관한 연구

김경환,김한도,성우경,Kim, Gyeong-Hwan,Kim, Han-Do,Seong, U-Gyeong 한국섬유공학회 1983 한국섬유공학회지 Vol.20 No.4

In general, the silk dyed with acid dyes is not good in fastness. To improve this defect, the silk dyed with Acid Mordant Blue 1 is treated with ferric nitrate solution. The results are as follows: 1) The amounts of iron absorbed on the dyed silk increase with the increase of temperature, concentration and pH of the ferric nitrate solution. 2) The development of the colour by the after chroming is accelerated according to the increase of treating temperature. In general, when the molar ratio between the absorbed dye and iron on the dyed silk is 1, the development of the colours reaches highest. 3) The colour fastness to light, washing, and hot water are improved by the after chroming, which is caused by the stable chelate formed with reaction of dye and ferric ion. 4) The amount of dye-Fe(III) complex is increased with the increase of Fe(III) concentration in the aqueous dye-Fe(NO$_3$)$_3$ solution which is the constant concentration of dye. With the reaction of Fe(III) on dye to the mole ratio 〔Fe(III)〕/〔dye〕=1, the absorbance of the maximum wavelength band 430nm of dye are decreased with the increase of the maximum wavelength band 590nm of dye-Fe(III) complex. As a results, it may be regarded that Fe(III) forms 1:1 complex type with the dye.

20게이지 결막경유 무봉합 유리체절제술의 초기 성적

김경환,이주은.Kyeong Hwan Kim. MD. Joo Eun Lee. MD. PhD 대한안과학회 2010 대한안과학회지 Vol.51 No.1

Purpose: To describe a transconjunctival sutureless technique for pars plana vitrectomy using conventional 20-gauge instruments. Methods: We performed transconjunctival sutureless pars plana vitrectomy (TSV) using conventional 20-gauge instruments in 36 eyes of 35 patients. We made 20-gauge transconjunctival beveled sclerotomies using microvitreoretinal (MVR) blades and used traditional 20-gauge instruments for the operations. Results: Eighty-three (81.4%) of 102 sclerotomies self-sealed without the need for sutures. The sutureless rate was even higher in the last one-third of the patients: 32 (94.1%) of 34 sclerotomy sites were sutureless. No serious complications were observed in our series, including postoperative hypotony, wound leakage, or endophthalmitis. Conclusions: The 20-gauge TSV technique is safe and can be utilized for almost all vitreoretinal diseases, without incurring additional cost for new instruments. J Korean Ophthalmol Soc 2010;51(1):22-28