Prediction from Linear Regression Equation for Nitrogen Content Measurement in Bentgrasses leaves Using Near Infrared Reflectance Spectroscopy

차정훈,김경덕,박대섭,Cha, Jung-Hoon,Kim, Kyung-Duck,Park, Dae-Sup Turfgrass Society of Korea 2009 한국잔디학회지 Vol.23 No.1

Near Infrared Reflectance Spectroscopy(NIRS) is a quick, accurate, and non-destructive method to measure multiple nutrient components in plant leaves. This study was to acquire a liner regression equation by evaluating the nutrient contents of 'CY2' creeping bentgrass rapidly and accurately using NIRS. In particular, nitrogen fertility is a primary element to keep maintaining good quality of turfgrass. Nitrogen, moisture, carbohydrate, and starch were assessed and analyzed from 'CY2' creeping bentgrass clippings. A linear regression equation was obtained from accessing NIRS values from NIR spectrophotometer(NIR system, Model XDS, XM-1100 series, FOSS, Sweden) programmed with WinISI III project manager v1.50e and ISIscan(R) (Infrasoft International) and calibrated with laboratory values via chemical analysis from an authorized institute. The equation was formulated as MPLS(modified partial least squares) analyzing laboratory values and mathematically pre-treated spectra. The accuracy of the acquired equation was confirmed with SEP(standard error of prediction), which indicated as correlation coefficient($r^2$) and prediction error of sample unacquainted, followed by the verification of model equation of real values and these monitoring results. As results of monitoring, $r^2$ of nitrogen, moisture, and carbohydrate in 'CY2' creeping bentgrass was 0.840, 0.904, and 0.944, respectively. SEP was 0.066, 1.868, and 0.601, respectively. After outlier treatment, $r^2$ was 0.892, 0.925, and 0.971, while SEP was 0.052, 1.577, and 0.394, respectively, which totally showed a high correlation. However, $r^2$ of starch was 0.464, which appeared a low correlation. Thereof, the verified equation appearing higher $r^2$ of nitrogen, moisture, and carbohydrate showed its higher accuracy of prediction model, which finally could be put into practical use for turf management system. Near Infrared Reflectance Spectroscopy(NIRS)는 짧은 시간 안에 식물의 다양한 영양소를 동시에 정확하고 빠르게 측정할 수 있다. 본 연구는 creeping bentgrass 'CY2' 엽의 여러 가지 기본 요소의 값을 예측하기 위해서 NIRS(근적의선 분광분석기)를 사용하여 측정하였다. 그 결과, 질소와 수분 그리고 탄수화물의 $r^2$은 각각 0.892, 0.925, 0.971이었다. 검량식에 대한 검증에서 $r^2$이 높은 상관관계를 나타냈으므로, 잔디에서 더 많은 연구를 위한 실용화 가능성을 확인 할 수 있었다.

Linear and whorled nevoid hypermelanosis 2예

차정훈(Jung Hoon Cha),장호선(Ho Sun Jang),오창근(Chang Keun Oh),권경술(Kyung Sool Kwon),김문범(Moon Bum Kim) 대한피부과학회 2000 대한피부과학회지 Vol.38 No.5

Linear and whorled nevoid hypermelanosis(LWNH) is a congenital disorder characterized by hyperpigmented macules following Blaschko's lines with onset usually in the first year of life. There is no preceding inflammatory event or palpable lesion and mucous membranes, eyes, palms, and soles are spared. Histologically, it is characterized by increased pigmentation of basal layer without pigmentary incontinence or increase in dermal melanophage. It seems that this disorder is not rare but is not well recognized or is confused with other entities. We present two cases of linear and whorled nevoid hypermelanosis in 11-year-old and 20-month-old girls with characteristic clinical and histologic findings. (Korean J Dermatol 2000;38(5):669~673)

규칙적인 테니스 운동이 중연 여성들의 혈중 콜레스테롤 및 신체적 자기효능감에 미치는 효과

차정훈(Jung Hoon Cha),조인호(In Ho Cho),한민규(Min Kyu Han) 한국여성체육학회 2005 한국여성체육학회지 Vol.19 No.4

수종의 피부 양성종양, 전구암 및 악성종양에서 telomerase의 활성도

차정훈(Jung Hoon Cha),장호선(Ho Sun Jang),오창근(Chang Keun Oh),권경술(Kyung Sool Kwon) 대한피부과학회 2000 대한피부과학회지 Vol.38 No.12

Background:Telomerase is a ribonucleoprotein complex with RNA-dependent DNA polymerase which is necessary in maintenance of the length of chromosome, and therefore, in preventing genomic instability. Its activity is regarded as an indicator of cell immortalization. So far, there is no comprehensive answer on which step the telomerase activity is required; in some studies, telomerase activity has been found in benign, premalignant, and malignant conditions equally, which means it affects early stage of carcinogenesis, but in other studies, it has been found in malignant conditions at a higher rate. Objective:This study was performed to examine telomerase activity in normal and skin cancer tissues and to assess the role of telomerase in the development of malignant transformation of skin cancer by examining benign, premalignant, and malignant conditions together. Methods:Telomerase activities in four benign skin tumors, five precancerous lesions, and 17 skin cancer tissues of the skin were measured by a method telomeric repeat amplification protocol(TRAP). TRAP assay was also performed on normal control tissue of the same patients and eight skin tissues of the healthy volunteers. Results:Telomerase activity was detected in 50% of benign tumors, 100% of precancerous, and 82% of malignant tissues. Among them, three out of four BCC tissues were shown to contain telomerase activity, whereas normal tissue of the same patients were not. No telomerase activity was detected in all of the eight skin samples of the healthy volunteers. Conclusion:Telomerase activities may be required at early stage of tumorigenesis as these activities are required for further steps down of the oncogenesis. (Korean J Dermatol 2000;38(12):1590~1597)

피부과 원격진료 상단예의 분석

차정훈(Jung Hoon Cha),오창근(Chang Keun Oh),장호선(Ho Sun Jang),권경술(Kyung Sool Kwon) 대한피부과학회 2001 대한피부과학회지 Vol.39 No.5

N/A Background: Telemedicine(tele+medicine= medicine at a distance) is a health care delivery system to deliver health care to patients at distant sites. In Korea, medical counseling by PC communication is nearly the only available field in the telemedicine at present. However, the concerns of telemedicine is growing as an issue, and dermatologists in Korea should be prepared for the era of teledermatology. Objective: We analyzed the queries of PC communication and the internet. Based on the results of the analysis, we tried to establish a more effective medical counseling system by PC communication and make them basic data to prepare the utilization of telemedicine system. Methods: We analyzed questions and answers in ten sites in a computer mediated communication system from Jan 1 to Dec 31, 1997. Results: The proportion of questions in dermatologic mea among all medical fields was relatively high(8.7-13.4%). The frequency was acne, urticaria, alopecia, and so on, in an order of high frequency, which was different from previous results in a statistical study of outpatients in dermatology. Reasons for questions were to know the treatment method(42.2%), to get the diagnosis (23.7%), and so on. Contents of answers were explanation(46.5%), advice to visit doctors(40.4%), and so on. Conclusion: The proportion of dermatologic questions in telemedicine was high, and there are possibilities of dermatology`s being important in the future of telemedicine. Therefore, dermatologists should be prepared for the future telemedicine era. However, teledermatology should be evaluated thoroughly and improved because we could see some problems in that.

Secular Trends in the Growth Curve of Body Mass Index on Female Childhood

Jung Hoon Cha(차정훈),Dong Joon Lee(이동준),Jae Hyeon Park(박재현) 한국발육발달학회 2005 한국발육발달학회지 Vol.13 No.1

신체전기저항법을 사용한 체지방 측정의 오차원

차정훈(Jung Hoon Cha) 한국발육발달학회 2006 한국발육발달학회지 Vol.14 No.1

Prediction from Linear Regression Equation for Nitrogen Content Measurement in Bentgrasses leaves Using Near Infrared Reflectance Spectroscopy

Jung-Hoon Cha(차정훈),Kyung-Duck Kim(김경덕),Dae-Sup Park(박대섭) 한국잡초학회·한국잔디학회 2009 Weed & Turfgrass Science Vol.23 No.1

Near Infrared Reflectance Spectroscopy(NIRS)는 짧은 시간 안에 식물의 다양한 영양소를 동시에 정확하고 빠르게 측정할 수 있다. 본 연구는 creeping bentgrass ‘CY2’ 엽의 여러 가지 기본 요소의 값을 예측하기 위해서 NIRS(근적외선 분광분석기)를 사용하여 측정하였다. 그 결과, 질소와 수분 그리고 탄수화물의 r²은 각각 0.892, 0.925, 0.971이었다. 검량식에 대한 검증에서 r²이 높은 상관관계를 나타냈으므로, 잔디에서 더 많은 연구를 위한 실용화 가능성을 확인 할 수 있었다. Near Infrared Reflectance Spectroscopy(NIRS) is a quick, accurate, and non-destructive method to measure multiple nutrient components in plant leaves. This study was to acquire a liner regression equation by evaluating the nutrient contents of ‘CY2’ creeping bentgrass rapidly and accurately using NIRS. In particular, nitrogen fertility is a primary element to keep maintaining good quality of turfgrass. Nitrogen, moisture, carbohydrate, and starch were assessed and analyzed from ‘CY2’ creeping bentgrass clippings. A linear regression equation was obtained from accessing NIRS values from NIR spectrophotometer(NIR system, Model XDS, XM-1100 series, FOSS, Sweden) programmed with WinISI Ⅲ project manager v1.50e and ISIscan® (Infrasoft International) and calibrated with laboratory values via chemical analysis from an authorized institute. The equation was formulated as MPLS(modified partial least squares) analyzing laboratory values and mathematically pre-treated spectra. The accuracy of the acquired equation was confirmed with SEP(standard error of prediction), which indicated as correlation coefficient(r²) and prediction error of sample unacquainted, followed by the verification of model equation of real values and these monitoring results. As results of monitoring, r² of nitrogen, moisture, and carbohydrate in ‘CY2’ creeping bentgrass was 0.840, 0.904, and 0.944, respectively. SEP was 0.066, 1.868, and 0.601, respectively. After outlier treatment, r² was 0.892, 0.925, and 0.971, while SEP was 0.052, 1.577, and 0.394, respectively, which totally showed a high correlation. However, r² of starch was 0.464, which appeared a low correlation. Thereof, the verified equation appearing higher r² of nitrogen, moisture, and carbohydrate showed its higher accuracy of prediction model, which finally could be put into practical use for turf management system.

엘리트 남자 테니스 선수들의 양손 백핸드 스트로크 동작에 대한 운동학적 분석

차정훈 ( Jung-hoon Cha ),정희석 ( Hee-seok Chung ),김석환 ( Seuk-hwan Kim ) 한국체육대학교 체육과학연구소 2016 스포츠사이언스 Vol.33 No.2

본 연구의 목적은 엘리트 남자 테니스 선수들의 백핸드 스트로크 동작에서 나타나는 운동학적 변인들을 정량적으로 분석하는데 있다. 본 연구의 목적을 달성하기 위하여 K대학교 엘리트 남자 테니스 선수 7명을 대상으로 적외선 카메라 12대를 사용하여 3차원 동작분석을 실시하였으며 다음과 같은 결론을 얻었다. 첫째, 구간 별 소요시간은 P2구간이 가장 빠른 시간 내에 수행 한 것으로 나타났다. 둘째, 라켓의 이동범위는 좌우 방향, 수직 방행에 비해 전후 방향으로 가장 큰 이동범위(ROM)를 보였다. 셋째, 라켓의 최대 선속도는 전후 속도가 가장 빠르게 나타났고, 다음으로 좌우 속도, 수직 속도 순으로 나타났으며 합성속도는 21.48±1.36 m/sec 로 나타났다. 넷째, 각 분절(골반, 몸통, 상완, 라켓)의 최대각속도는 라켓을 중심으로 원위 분절인 골반이 가장 느린 각속도를 보였으며 몸통, 상완, 라켓의 순으로 나타났고, 각 분절의 최대 각속도 발현 시점은 골반, 몸통, 상완, 라켓 순서를 보였는데 이는 근위 분절로부터 원위 분절까지 운동량이 연속적으로 전이되는 채찍 모형 패턴(Whip-like pattern)으로 백핸드 스토로크 동작에 있어 효과적인 동작을 수행한 것으로 판단된다. The aim of this study was to analysis quantitatively kinetic variables on two-handed backhand stroke of elite male tennis players. Seven tennis players who belong to K university were participated, and 3-dimensional motion analysis of their backhand stroke was conducted by using 12 infrared cameras. The results were as follows. First, the time required by sections indicated duration of P2 section was the shortest. Second, range of motion (ROM) of racket indicated anteroposterior motion was the largest, followed by side to side and vertical direction. Third, maximal linear velocity showed anteroposterior velocity was the fastest, followed by side to side and vertical velocity, and resultant velocity was 21.48±1.36 m/sec. Fourth, maximal angular velocity of pelvis, trunk, upper arm and racket showed velocity of pelvis which was most distal from racket was the slowest, followed by trunk, upper arm, and racket. And the timing of maximal angular velocity of pelvis was the fastest, followed by trunk, upper arm and racket. It concluded that this Whip-like pattern which meant momentum moved from distal to proximal part was effective on backhand stroke of tennis.

테니스 선수의 키네시오테이핑 적용이 팔꿈치 관절의 기능과 테니스 수행능력에 미치는 효과

차정훈 ( Jung-hoon Cha ),이수호 ( Soo-ho Lee ),김석환 ( Seuk-hwan Kim ) 한국체육대학교 체육과학연구소 2015 스포츠사이언스 Vol.32 No.2

본 연구에서는 외측 팔꿈치관절 건병증 소견이 없는 11명의 엘리트 테니스 선수들을 대상으로 두 가지의 키네시오테이핑 방법을 각각 적용하고 두 가지의 방법을 동시에 적용한 후, 키네시오테이핑 적용 전과 후의 팔꿈치 기능과 테니스 수행능력에 대한 변화를 15점의 GROC 척도를 사용하여 확인하였다. 그 결과, 첫 번째 키네시오테이핑 방법의 경우, 남성과 여성 테니스선수의 GROC는 각각 2.29±1.496과 2.50±2.380으로 팔꿈치 기능과 테니스 수행능력에 긍정적인 영향을 주었으나, 두 번째 키네시오테이핑 방법의 경우 남성 테니스 선수의 GROC는 2.29±1.704로 팔꿈치 기능과 테니스 수행능력에 긍정적인 영향을 주었고, 여성 테니스 선수의 GROC는 -2.25±3.403으로 부정적인 영향을 주었다. 두 가지의 키네시오테이핑을 동시에 적용했을 때는 남녀 테니스선수의 GROC가 각각 4.43±0.976과 3.50±2.646으로, 팔꿈치 기능과 테니스 수행능력에 긍정적인 영향을 주었으며, 각각의 키네시오테이핑 방법을 적용하는 것보다 두 가지의 방법을 동시에 적용하는 것이 더 많은 긍정적인 영향을 주었다. 따라서 두 가지의 키네시오테이핑 동시에 적용하는 것이 외측팔꿈치 건병증을 예방하거나 치료하는 데에 효과적인 방법이 될 수 있을 것이라 생각된다. It is not tennis players but general population who suffer from Lateral elbow tendinosis(LET). Kinesiotaping(KT) is one of intervention methods for LET, but effect of KT is lack of scientific evidence. After 11 elite tennis player(male=7) without LET were applied by two different ways of KT, respectively and together, rate of change on elbow function and tennis performance was identified by 15-point global rating of change (GROC) scale. After applying 1st KT, GROC of male was 2.29±1.496, and that of female was 2.50±2.380, but for 2nd KT GROC of male was 2.29±1.704, that of female was -2.25±3.403. It means 1st KT has a positive effect on elbow function and tennis performance of male and female, but 2nd KT was a positive method for male and negative for female. After applying both KT methods, GROC of male and female was 4.43±0.976 and 3.50±2.646, respectively, and it was higher than each KT method. Therefore applying both KT methods is effective method for preventing or treating for LET.