기울기를 이용한 랜덤워크 윌콕슨 부호순위검정

김태윤,박철용,김슬기,김민석,이우정,권윤지,Kim, Tae Yoon,Park, Cheolyong,Kim, Seul Gee,Kim, Min Seok,Lee, Woo Jung,Kwon, Yunji 한국데이터정보과학회 2014 한국데이터정보과학회지 Vol.25 No.6

랜덤워크는 다양한 분야에서 랜덤현상을 기술하는데 이용되고 있으나, 현재까지 개발된 랜덤워크 검정법에는 유의수준 왜곡과 낮은 검정력 등의 문제가 있는 것으로 알려져 있다. 이러한 문제점들을 개선하기 위해 Kim 등 (2014)은 부호검정에 기초한 랜덤워크 검정 (${\rho}=1$)방법을 제안하였다. 본 논문에서는 보다 개선된 랜덤워크 검정법을 제안하고자 부호검정보다 검정력이 우수한 것으로 알려진 윌콕슨 부호순위검정을 이용한 랜덤워크 검정법을 제안하고, 모의실험을 통해 부호검정, 윌콕슨 부호순위검정, 확장 Dickey-Fuller 검정의 성능을 비교하였다. 모의실험 결과 소표본에서 비모수 검정기법들이 ADF 검정보다 우월하다는 사실을 재확인하였다. 새롭게 밝혀진 사실은 부호검정이 윌콕슨 부호순위검정에 비해 높은 검정력을 가지며, 또한 비모수 검정기법들은 ${\rho}$가 양의 부호를 가지는 경우 (0 < ${\rho}$ < 1) 정규분포보다 이중지수분포에서 낮은 검정력을 가지게 되나, ${\rho}$가 음의 부호(-1 < ${\rho}$ < 0)를 갖는 경우에는 정규분포보다 이중지수분포에서 높은 검정력을 보인다는 사실이다. Random walk is used for describing random phenomenon in various areas but tests for random walk developed so far are known to suffer from size distortion and low power. Kim et al. (2014) proposed a sign test for unit root (${\rho}=1$) hypothesis based on slopes. This article proposes a Wilcoxon signed rank test based on slopes for unit root hypothesis, and compares it with the augmented Dickey-Fuller test and the sign test by a simulation study. Our results confirm that the nonparametric tests are better than ADF test for small samples like n = 30. The results also show that the sign test is better than the Wilcoxon signed rank test and that for 0 < ${\rho}$ < 1 (-1 < ${\rho}$ < 0), the nonparametric tests suffer from power loss (improvement) as normal error changes to double exponential error.

기울기를 이용한 랜덤워크 부호검정

김태윤,박철용,김슬기,김찬진,김현,유주형,장경민,장영석,Kim, Tae Yoon,Park, Cheolyong,Kim, Seul Gee,Kim, Chan Jin,Kim, Hyun,Yu, Ju Hyung,Jang, Kyung Min,Jang, Young Seok 한국데이터정보과학회 2014 한국데이터정보과학회지 Vol.25 No.2

랜덤워크 가설은 금융시장의 예측 어려움을 이론적으로 설명하는 가설이다. 현재까지 다양한 랜덤워크 검정방법들이 개발되어 왔으나 낮은 검정력과 유의수준 왜곡 등의 문제를 보이는 것으로 알려져 있다. 본 논문에서는 이러한 문제점들을 개선하기 위해 부호검정에 기초한 랜덤워크 검정방법을 제안하였다. 랜덤워크와 관련하여 흔히 사용되고 있는 Dickey와 Fuller (1979) 검정과 모의실험을 통해 성능을 비교하였다. Random walk hypothesis is a hypothesis that explains theoretically the difficulty in forecasting in financial market. Various tests for the hypothesis have been developed so far but it is known that those tests suffer from low power and size distortion. In this article, a sign test based on slopes are suggested to overcome these difficulties. A simulation study is conducted to compare this test to the often used Dickey and Fuller (1979) test.

기본첩포검사에서 소실 및 자극반응의 발현빈도

김태윤,윤두희,이준영,김형옥,김정원 ( Tae Yoon Kim,Dou Hee Yoon,Jun Young Lee,Hyung Ok Kim,Chung Won Kim ) 대한피부과학회 1997 大韓皮膚科學會誌 Vol.35 No.6

Background: The patcl test is widely used for diagnosis of allergic contact dermatitis. However, it is sometimes difficiilt or even impossihle to differentiate between allergic and irritant reactions in patch test readings. The achievernent of valid results from the patch test require intelligent and careful patch testing and physirians with skills and experiences. Objective : The purpos of this study was to assess the frequency, age and sex distr ibution, and the seasonal variatioii of irritant. and lost reactions in standard patch tests. Methods : Patch test records of day 2 and day 4 were reviewed and analysed. Frequency of inritant and lost reactions were analysed by allergen, age, sex and season. Results : A total 212 c ses of standard patch test records(rnale 69, female 143) were analysed. The results were as follovs ; 1. The over all frequency of lost reactions in the standard patch test were 33.5 percents and that of irritant reactions were 8.0 perr.ents. 2. The frequency of lost reactions was lower in the age groups under twenty(7.7%) than in the older age groups(35.5%). However, there was no significant difference het,ween the age groups over the third dec ide. 3. The seasonal variation was evident in lost reactions. The order of frequency was summer(45. 0% ), winf,er(33.7% ), spri,ig and fall(2l.1% ). 4. The order of frequency of lost reactions in the stclndard patch allergen was captan(5.7%), potassium dichromate(5.2%), cobalt chloride(4.7%), mercury amrnoniurn chloride(3.8%) c3lld wool alcohol(3.8%) Conclusion : Our result, show a relatively high frequency of lost and irritant. reaction in the standird patch test, and uggest second readings in the patch test would he of value. (Korean J Dermatol 1997;35(6): 1095-1100)

운동자유도에 따른 어깨관절 굴곡각도의 변화

김태윤,최재원,Kim, Tae-Yoon,Choi, Jae-Won 대한고유수용성신경근촉진법학회 2009 PNF and Movement Vol.7 No.1

Objective : The purpose of this study was conducted to find the change of shoulder flexion by degree of freedom between the Proprioceptive Neuromuscular Facilitation(PNF) pattern, the flexion- abduction- external rotation, and not PNF pattern, the flexion- exteral rotation(except abduction)movement. Method : PNF pattern applied on the unilateral upper extremity in all subjects were the flexion- abduction- external rotation, and not PNF pattern, and twenty-six normal subjects(13 male, 13 female) were tested by Cybex Norm Testing & Rehabilitation System. Results : PNF pattern showed significant increase of flexion than not PNF pattern, the flexion-exteral rotation(except abduction)movement, and also the female group was significantly increased than male group. Conclusion : The results suggested that the application of PNF pattern to the unilateral upper extremity had affected on the shoulder flexion by degree of freedom.

방탄소재 활용을 위한 SLS 유리의 이온교환 효과

김태윤,심규인,최세영,Kim, Tae-Yoon,Shim, Gyu-In,Choi, Se-Young 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.1

There are a number of studies on chemically strengthened glass. Most of them are strengthened in molten salt bath below transformation range of glass. This research is distinguished from the aforementioned studies in that single $KNO_3$ powder was used by employing screen printing technique. In this study soda-lime-silicate(SLS) glasses for bulletproof glass application with various thicknesses were used. The maximum value of the bending strength is 791MPa heat treated at $480^{\circ}C$, which is about 4.3 times higher than the parent glass, which is the highest strength of all soda-lime glasses. In this study, it is also observed that Vickers hardness increased to $657H_v$, which is about 15% higher than the parent glass($568.7H_v$) and fracture toughness was not changed. Depth profiles measured by electron probe micro analyzer(EPMA) showed a correlation between the migrations of $K^+$ ions with bending strength of ion exchanged glasses.

고유수용성 신경근 촉진법에 의하 Sport 장해 환자의 치료

김태윤,Kim, Tae-Yoon 대한물리치료과학회 1996 대한물리치료과학회지 Vol.3 No.4

The purpose of this review are that what is the concept of sport P. N. F and to give the information about proprioceptive neuromuscular facilitation technique when the sport physical therapy will be needed in field. Technique of proprioceptive neuromuscular facilitation are methods of placing specific demands in order to secure a desired response. Greatest emphasis was placed on the application of optimal resistance throughout the range of motion, using many combinations of motions which were related to primitive patterns and employment of postural and righting reflexes. The treatment after sport injury patient is required that two component actions of muscles as well as permitting action to occur at two or more joint. The effect of P. N. F and of sprot P. N. F are reviewed. Implications for treatment of sport disability are suggested.

FLUENT-VOF법을 이용한 자유수면 부근을 정속으로 움직이는 물체주위 유동해석

김태윤,현범수,Kim, Tae-Yoon,Hyun, Beom-Soo 한국항해항만학회 2008 한국항해항만학회지 Vol.32 No.1

VOF법은 유체 체적 비율을 통해 밀도가 다른 두 유체를 한꺼번에 계산할 수 있는 수치해석 기법이다. 상용 CFD프로그램의 VOF옵션을 이용하여 자유수면 부근에서 정속으로 움직이는 물체 주위의 수치해석을 시도하였다. 검증 대상으로는 물 속에 잠겨있는 2차원 날개, 자유수면을 수직으로 관통하는 3원 날개, 그리고 컨테이너 선형이 사용되었다. 검증 결과 정도의 차이는 있지만 상용 코오드의 범용성을 어느 정도 확인할 수 있었고 자유수면 유동장을 모사하는데 VOF법이 무난히 활용될 수 있음을 알 수 있었다. VOF method is known as one of the most effective numerical techniques handling two-fluid domains of different density simultaneously. Present study deals with the numerical analysis of flow field around bodies steadily moving near free-surface using FLUENT-VOF method. Validations were made by applying to three typical examples ; 2-D submerged hydrofoil, 3-D surface piercing body and container ship. It was found that the commercial software, FLUENT, is useful in practical use, and VOF method is capable of handling free-surface around moving bodies although discussions are limited to the analysis in qualitative sense.

규폐증을 동반한 진행성 전신성 경피증

김태윤,조상현,김시용,조백기,이숙영 (Tae Yoon Kim,Sang Hyun Cho,Si Yong Kim,Baik Kee Cho,Sook Young Lee) 대한피부과학회 1996 대한피부과학회지 Vol.34 No.2

Scleroderma is sclerosis of the skin characterized by the appearance of circumscribed or diffuse hard, smooth, ivory-colored anea that are immobile upon the underlying tissues and give the appearance of hide-bound skin. Several environmental factors and chemicals have been described as being able to induce systemic scleroderma and scleroderma-like diseases. A possible association between scleroderma and workers exposed to silica has been suggested by reports in the literature since the turn of the century. We report a 55-year-old man, with a history of Raynaud's phenomenon and dysphagia, who had been exposed to silica dust over fifteen years. He had a mask-like face, flexian deformity of fingers, and hyperpigmented induration on the skin of all the extremities and the trunk. Antinuclear antibodies were positive in nucleolar type. On radiologic study, streaky, mottled, and nodular increased densities were noted in the both lung fields and these findings were consistent with silicosis. Endoscopic and manometric examination of the esophagus represented scleroderrna esophagus. Histopathological findings were compatible with scleroderma. He was treated with azathioprine and nifedipine with good improvement. (Kor J Dermatol 1996;34(2): 322-325)

The current evidence for the effectiveness of exercise in low back pain

김태윤,정성욱,Kim, Tae-Yoon,Jung, Sung-Woog The Korean Society of Physical Therapy 2002 대한물리치료학회지 Vol.14 No.1

컴퓨터를 이용하여 MEDLINE, AMED, CINAHL과 Cochrane Libra를 검색하여 요통환자를 위한 다양한 형태의 운동치료 효과에 대해서 발표된 연구 보고서 중 1991년부터 2001년 사이에 영문으로 출판된 보고서를 중심으로 본 연구에 합당한 주제를 충족시키는 연구 보고서 40편을 선택하였다. 수집된 자료를 통하여 요통 관리의 운동치료 효과에 대하여 연구하였으며 일반적인 요통환자들만을 대상으로 급성, 아급성, 만성단계로 구분하였다. 실험논문은 수정된 rating system을 이용하여 논문의 질 수준과 연구결과를 측정하였으며 고찰 논문과 관찰 연구는 grading system을 사용하여 주요 연구 결과를 측정하였다. 본 연구의 결과는 운동치료가 통증감소와 기능 향상에 효과적임이 증명되었고, 총괄적으로 타당도를 지지하는 정도는 중등도에 해당되었다. 연구보고서들을 scale system을 통해서 세부적으로 분석했을 때, 상급의 연구 방법론적 질을 충족시켰다. 결과에 따르면 급성, 아급성과 만성요통에 대한 운동치료가 효과적이었다라는 확실한 증거를 나타냈다. 본 연구의 결론은 요통환자에 대한 운동치료는 효과적으로 입증되었으며, 특별히 만성요통환자의 경우에 더욱 더 효과적인 것으로 나타났다. 이러한 결론을 더욱 지지하기 위해서는 더 많은 고질의 연구 논문들이 이루어져야 할 것이다.

유산소성 운동이 비만 고등학생의 혈중지질 농도에 미치는 영향

김태윤,Kim, Tae-Yoon 대한물리치료과학회 1997 대한물리치료과학회지 Vol.4 No.2

The purpose of this paper was to evaluated a effect of aerobic exercise for obesity high school student. The subjects were 20 obesity boys and 20 obesity girls as above 25% body fat. The exercise program of this study composed to intensity of $60{\pm}10%$ HRmax, 4 day/weeks and $40{\sim}50$ min/day during twelve weeks. The results were summerized as follows : 1. There were significantly decreased on T-cholesterol, LDL, Triglyceride between pre and post tests of exercise group and HDL-cholesterol was significantly increased but no significant difference of the non exercise group in men. 2. There were significantly decreased on T-cholesterol, LDL, Triglyceride between pre and post tests but no significant difference in HDL of the exercise group in women. 3. There were no significant difference between men and women.