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)

UHF RFID를 이용한 위치정보 기반 건축자재 관리 시스템

김태윤,황석승,Kim, Tae-Yun,Hwang, Suk-Seung 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.9

RFID(Radio Frequency Identification)는 라디오파를 이용하여 사물에 부착된 태그에 저장되어 있는 고유정보를 무선으로 전송하는 기술이다. 건축 분야에서 RFID를 사용하여 자재의 투입량과 재고 관리를 위한 자재관리 시스템의 구축사례가 증가 하고 있는 추세이다. 기존의 자재관리 시스템은 자재의 투입량과 재고 관리를 위해 자재에 RFID태그를 부착시키고 자재 투입 시 자재에 부착된 태그를 인식하는 기능만을 가진 시스템이 대부분이고, 자재의 재사용을 위해 자재의 위치정보를 RFID를 활용하여 자동으로 인식하고 관리할 수 있는 시스템 개발은 활발히 이루어지고 있지 않다. 본 논문에서는 건축자재의 효율적인 재사용을 위해 특정 서브와 리더기의 거리측정값을 기반으로 자재의 위치를 추정하여 메인 서버에 저장하는 기능을 가지는 RFID 시스템을 제안한다. 시스템의 구조는 RFID 리더부, 거리측정부, 통신부, 저장부로 구성된다. Using the radio wave, RFID(: Radio Frequency IDentification) wirelessly transmits the unique information saved in a tag attached on the specific object. In the construction area, the trend in using RFID for managing the input and inventory of the construction materials is upward. General management systems for the construction materials have only a function of identifying the tag attached on the construction materials, but the management system with a function of identifying and managing the location information of the construction materials employing RFID, for reusing it, is not actively developed. For the efficient reuse of the construction materials, in this paper, we propose the RFID system with a function of estimating and saving the location information of the specific construction materials, based on the estimated distances between the particular subs and reader. The proposed system consists of RFID reader, distance estimate, communication, and memory units.

여과형 시설에 적용되는 여재의 처리효율 영향인자를 고려한 실증화 평가

김태윤,이준배,이동우,신현석,김현철,권순철,Kim, Taeyoon,Lee, Junebae,Lee, Dongwoo,Shin, Hyunsuk,Kim, Hyunchul,Kwon, Soonchul 한국물환경학회 2017 한국물환경학회지 Vol.33 No.5

Increased impervious surface caused by rapid urbanization serves to produce the discharge of non-point source pollutants such as total suspended solid (TSS). There exist various methods of removing TSS, including a filtration process using granular media (a well-known method to be practically used after the consideration of removal efficiency, clogging, and backwashing efficiency). To determine the TSS removal capability of the filter, we initially performed lab-scale experiments which assessed flow rates, influent concentrations, permeability co-efficients, the particular shapes of suspended solids and potential clogging, and also evaluated TSS removal efficiency when applied to filtration facility in a pilot-scale. In low filtration flux condition, the removal efficiency of suspended solids was more than 95 %, while decreased to 83% in high filtration flux. Regarding the clogging aspect of the experiment, total cumulative solids were loaded up to $19.15kg/m^2$, and TSS removal efficiency was noted to commence to decrease when the loaded solids exceeded $9.0kg/m^2$. It was also noted, however, that superior efficiency was maintained for six hours. In addition, for pilot-scale experiment, the removal efficiency was still high enough (83.4 %) for the solid concentration of 140 ~ 343 mg SS/L and after backwashing, head loss was recovered to 92 ~ 95 % during two hour filtration. With these results, It was confirmed that lifetime of the filter applied to the test was prolonged due to the high treatment efficiency and good backwashing efficiency for the cumulative solids load.

회원작품 - 관류헌(觀流軒)

김태윤,Kim, Tae-Yun 대한건축사협회 2011 建築士 Vol.2011 No.9

회원작품-대구 제일교회 교육문화관

김태윤,박태환,Kim, Tae-Yun,Park, Tae-Hwan 대한건축사협회 2007 建築士 Vol.2007 No.9

데이타의 유사성을 이용한 실제 색상 화상의 압축 기법

김태윤,송길영,조광문,최창원,Kim, Tai-Yun,Song, Gil-Yeong,Jo, Gwang-Mun,Choe, Chang-Won 한국정보처리학회 1994 정보처리논문지 Vol.1 No.3

It is true color that is allocated 1 byte to three basic colors, red, green, and blue in order to represent a pixel of an image. It is a merit that almost all colors are representable by using the true color. However, it requires a lot of storages. An efficient image compression method is necessary. Most of the existing compression methods have not considered the characteristics of the true color images. Therefore, the efficient compression has been almost impossible. The differences of each pixel and its adjacent pixels in the true color images are few. Only a few bits in 3 bytes data which represent a pixel have different values. But the different bits are scattered in 3 bytes, so efficient compression results are not achieved. Therefore, in the study it is shown that the similarities of data are increased by relocating the data structures of true color images. And an efficient compression strategy which uses the similarities of data is proposed. 컬러 화상의 실제 색상은 한 픽셀을 나타내는 3가지 기본 색상 Red, Green, Blue 에 각각 1 바이트씩 할당된 것을 말한다. 실제 색상을 사용하면 거의 모든 색상을 표 현할 수 있는 장점을 갖고 있다. 그러나 많은 기억 용량이 요구되어 효율적인 화상 압축 기법이 필요하게 된다. 기존의 화상 압축 기법들은 대부분 실제 색상 화상의 특 성을 고려하지 않은 방법을 사용하여 효율적인 압축을 수행할 수 없었다. 실제 화상의 각 픽셀과 인접 픽셀들과의 차이는 미소하다. 각 픽셀을 나타내는 3바이트의 데이타 에서 몇개의 비트안이 다른 값을 갖게 된다. 그러나 서로 다른 비트들이 3바이트 내에 흩어져 있어서 효율적인 압축 결과를 얻을 수 없다. 따라서 본 연구에서는 실제 색상 화상의 구조를 변경시켜 데이타의 유사성을 증가시킨다. 이를 이용하여 효율적인 압 축을 수행할 수 있는 기법을 제안하였다.

회원작품 - 경회헌

김태윤,Kim, Tae-Yun 대한건축사협회 2012 建築士 Vol.2012 No.3

퇴행성 슬관절염의 한의학적 치료에 대한 국내 연구 동향

김태윤,김정현,박종훈,이제균,한창,금창준,오재우,Kim, Tae-Yoon,Kim, Jung-Hyun,Park, Jong-Hoon,Lee, Je-Kyun,Han, Chang,Kum, Chang-Jun,Oh, Jae-Woo 척추신경추나의학회 2014 척추신경추나의학회지 Vol.9 No.2

Objectives : The purpose of this review is to investigate the trends of Traditional Korean Medicine treatments on degenerative knee arthritis. Methods : We investigated the studies on traditional Traditional Korean Medicine (TKM) treatments for degenerative knee arthritis via searching 5 Korean web databases. Results : 31 research papers were found to be analyzed according to their published year, the titles of journals, published institution, the types of study, the number of cases, the types of treatments. 31 papers were published since 1992. The studies on TKM treatments about degenerative knee arthritis were mainly published in The journal of korean acupuncture & moxibustion medicine. 13 Randomized Controlled Trials, 10 Case series, 4 Reviews, 3 Non RCTs, and 1 Case Report had been under research. In 22 cases of the studies, one method was used to treat the symptoms. Whereas in 5 cases of the studies, various TKM treatments were used to treat the symptoms. Visual analogue score(VAS) and patient's subjective complaints were used as primary assessments. Conclusion : In this study, we analyzed the trends of TKM treatments on degenerative knee arthritis. Reviewing the domestic trends of studies on Traditional Korean Medicine treatments on degenerative knee arthritis and examining the strong and weak points of those treatments are essential for the further studies.