• 디지털융복합연구
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• 제10권4호
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• pp.191-197
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• 2012

본 논문에서는 단일 프레임 영상에서 초점을 이용하여 초기 깊이정보를 추출한 후 입체 영상을 생성하는 방법을 제안하였다. 단일 프레임 영상에서 깊이를 추정하기 위해 원본 영상과 가우시안 필터를 중첩 적용하여 생성된 영상의 비교를 통해 영상의 초점 값을 추출하고 추출된 값을 기반으로 초기 깊이정보를 생성하도록 하였다. 생성된 초기 깊이정보를 Normalized cut을 이용한 객체 분할 결과에 할당하고 각 객체의 깊이를 객체 내 깊이 정보의 평균값으로 보정하여 동일 객체가 같은 깊이 값을 갖도록 하였다. 객체를 제외한 배경 영역은 객체를 제외한 배경 영역의 에지 정보를 이용하여 깊이를 생성하였다. 생성된 깊이를 DIBR(Depth Image Based Rendering)을 이용하여 입체 영상으로 변환하였고 기존 알고리즘을 통해 생성된 영상과 비교 분석하였다.

• Korean Journal of Radiology
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• 제22권8호
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• pp.1332-1340
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• 2021

Objective: To evaluate the feasibility of a new three-dimensional (3D) MR fingerprinting (MRF) technique for the prostate gland by conducting phantom and clinical studies. Materials and Methods: The new 3D MRF technique used in this study enables quick data acquisition and has a high resolution. For the phantom study, the MRF T1 and T2 values in an in-house phantom were compared with those of goldstandard mapping methods using linear regression analysis. For the clinical study, we evaluated 90 patients who underwent prostate imaging with MRF for suspected prostate cancer between September 2019 and February 2020. The mean T1 and T2 values were compared in the peripheral zone, transition zone, and focal lesions using paired t tests. The differences in the T1 and T2 values according to cancer aggressiveness were evaluated using one-way analysis of variance. Results: In the phantom study, the MRF T1 and T2 values showed a perfect correlation with the gold-standard T1 and T2 values (R > 0.99). In the clinical study, the T1 and T2 values in the peripheral zone were significantly higher than those in the transitional zone (p < 0.001, both). The T1 and T2 values in prostate cancer were significantly lower than those in the peripheral and transitional zones. The higher the grade of cancer, the lower the T2 values. Conclusion: The T1 and T2 values obtained from the 3D MRF showed a perfect correlation with the gold standard values in the phantom study. Differences in the T1 and T2 values among the different zones of the prostate gland were identified using 3D MRF in patients.

• 말소리와 음성과학
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• 제4권3호
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• pp.51-58
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• 2012

The purpose of this study is to measure the impact of Korean speakers' English stop pronunciation on their general pronunciation proficiency. For these purposes, 20 Korean speakers read English sentences and their pronunciations were rated by native English speakers. The Korean speakers' VOT values of English stops in sentences were then measured and the relation between the VOT values and native speakers' pronunciation rating was compared. Here, the relation between (1) the proficiency score of each speaker and VOT values; and (2) the proficiency score of each sentence and VOT values were analyzed. The results show that there is a relation between the proficiency score of each sentence and VOT values of /t, b, d, g/; and there is a relation between VOT values of /t, b, d, g/ and proficiency scores of each speaker while these is a weak relation between VOT values of /p, k/ and proficiency scores of each speaker.

• 한국임상수의학회지
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• 제34권6호
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• pp.401-403
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• 2017

Total 283 dogs were enrolled in this study (control group: 140, patient group: 143). In the patient group, 143 dogs with underlying diseases including immune medicated hemolytic anemia (IMHA) (7), lymphoma (30), hyperadrenocorticism (HAC) (16), trauma (10), pyometra (8), bone fracture (38), peritonitis (13), meningoencephalitis (12) and mitral regurgitation (9) were enrolled in this study. Compared with healthy group, lymphoma, trauma, HAC, and IMHA group showed significantly (P < 0.01) high values of D-dimer and the highest levels in the IMHA group. Additionally, we evaluated the D-dimer level after a week of enoxaparin treatment, and the results showed D-dimer levels of post treatment group were significantly decreased compared to the pre-treatment group in lymphoma, HAC, trauma and IMHA diseases. In the high level D-dimer group, post D-dimer values after enoxaparin treatment had significantly decreased (P < 0.01) compared to levels prior to treatment.

• 대한화학회지
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• 제39권3호
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• pp.143-149
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• 1995

낮은 농도에서 유기색소와 계면활성제 계의 흡수거동을 계산하기 위해 간단한 모델을 사용해보았다. 실험에서 얻어진 값에 3개의 파라미터가 포함되어 있는 결과식을 적용함으로써 이온쌍형성$(K_O)$, 회합체에 계면활성제 분자첨가의 경우$(K_S)$, 그리고 색소회합반응$(K_D)$에 대한 평형상수들을 계산하였으며 이값들을 이용하여 자유에너지를 계산하였다. $K_O$와 K_S$의 값들은 소수성에 원인이 있는 정전기적 상호작용에서 기대했던 것들보다 컸었고, $K_D$값들은 정전기적 반발력의 차폐효과로 간주할 수 있는 순수한 수용액에서의 알려진 회합값보다 약 10~20배 정도 높았다.

• Radiation Oncology Journal
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• 제36권3호
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• pp.227-234
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• 2018

Purpose: We compared how doses delivered via two-dimensional (2D) intracavitary brachytherapy (ICBT) and three-dimensional (3D) ICBT varied anatomically. Materials and Methods: A total of 50 patients who received 30 Gy of 3D ICBT after external radiotherapy (RT) were enrolled. We compared the doses of the actual 3D and 2D ICBT plans among patients grouped according to six anatomical variations: differences in a small-bowel V_2Gy, small bowel circumference, the direction of bladder distension, bladder volume, sigmoid V_3.5Gy, and sigmoid circumference. Seven dose parameters were measured in line with the EMBRACE recommendations. Results: In terms of bladder volume, the bladder and small-bowel D_2cc values were lower in the 150-250 mL bladder volume subgroup; and the rectum, sigmoid, and bladder D_2mL values were all lower in the >250 mL subgroup, for 3D vs. 2D ICBT. In the sigmoid V_3.5Gy >2 _mL subgroup, the sigmoid and bladder D_2mL values were significantly lower for 3D than 2D ICBT. The bladder D_2mL value was also significantly lower for 3D ICBT, as reflected by the sigmoid circumference. In patients with a small bowel V_2.0Gy >10 mL or small bowel circumference >15%, most dose parameters were significantly lower for 3D than 2D ICBT. The bladder distension direction did not significantly affect the doses. Conclusion: Compared to 2D ICBT, a greater bladder volume can reduce the internal 3D ICBT organ dose without affecting the target dose.

• 한국작물학회지
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• 제45권6호
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• pp.374-381
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• 2000

This study was conducted to select sesame varieties with high cultural stabilities by comparing several parameters of agronomic traits under the different cultural environments. Of the six areas, Iksan and Jinju areas which showed positively larger environment index values were relatively adequate cultural conditions for sesame. At the comparison of cultural stability of agronomic traits by Eberhart and Russell regression model among sesame breeding lines, Suwon 169 showed more stable regression coefficient values to the number of capsules per plant, number of seeds per capsule and seed weight per plant, and Iksan 12 showed more stable regression coefficient values to culm length and weight per plant. At the comparison of cultural stability of yield per 10a, Suwon 169 and Iksan 12 among sesame breeding lines showed more stable respectively, deviation values of 0.99, 0.98 respectively, and more less regression deviation values of 0.074, 0.167 respectively. Therefore those breeding lines are comparatively higher stabilities to yield determining agronomic traits under the different cultural environments, and it was concluded that those two breeding lines had the possibility to recommend promising breeding lines in the future.

• 복식문화연구
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• 제24권3호
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• pp.315-323
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• 2016

The present study is intended to study sole types necessary for shoe designs for elementary school students that are in age groups in growth periods, and 3D midsole design utilizing 3D printing technology. This study analyzed data from the 3D measurement of the feet of 1,227 elementary school students aged 7-13 years residing in the capital region conducted as part of the 6th Anthropometry of Size Korea. In addition, 3D midsoles by sole type were designed utilizing a Rhino CAD, and midsole prototypes were output utilizing a Zortrax-M200 3D Printer. Through a cluster analysis of sole shapes by type, sole shapes were classified into three types. Type 1 has small values of foot lengths and foot breadths, with large toe 1 angles and high arch heights. Type 2 has intermediate values of foot lengths and foot breadths, with small toe 1 angles and high arch heights. Type 3 has large values of foot lengths and foot breadths with small toe 1 angles and low arch heights. On reviewing the results of design of 3D midsoles by sole type, it can be seen that the midsoles were designed according to characteristics by sole type. The results of the sole type analysis in the present study are expected to be meaningful as basic data for the development of shoe insoles for elementary school students.

• 방사성폐기물학회지
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• 제20권2호
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• pp.151-160
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• 2022

The sorption of Eu on MX-80 bentonite in Na-Ca-Cl solutions is investigated at a molal proton concentration (pH_m) range of 3 to 10 and an ionic strength (I) range of 0.1 to 6 m (mol·kgw^-1). The sorption equilibrium of Eu on MX-80 is achieved within 14 to 21 d at I = 0.1 and 6 m. The sorption distribution coefficient (K_d) values of Eu for MX-80 increase as pH_m increases from 3 to 6 for all I values, and they are independent of pH_m between 8 and 10 at I ≥ 0.5 m. Meanwhile, at I = 0.1 m, the K_d value at pH_m = 10 is slightly lower than those at pH_m = 8 and 9. The K_d values are not affected by the I values between 0.5 m and 6 m, whereas the K_d value at I = 0.1 m is greater than those at I ≥ 0.5 m, except at pH_m = 10. A two-site protolysis nonelectrostatic surface complexation and cation exchange sorption model is applied to the Eu sorption data for I ≤ 4 m, and the equilibrium constants of the sorption reactions are estimated.

• Bulletin of the Korean Chemical Society
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• 제6권1호
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• pp.37-40
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• 1985

The electrical conductance and UV absorbance of 4,N-dimethyl Pridinium Iodide (NDMPI) were measured in the ethanol volume percentage, 95, 90, 80 and 60 of an ethanol-water mixture at 15, 25, 35 and $45^{\circ}C$. Ionic association constants(K) of NDMPI were evaluated in accordance with a combined method of conductance UV absorbance. The ion size parameter (${\gamma}_{\pm}$) and dipole momemt (${\mu}_{A+D-}$) of NDMPI were obtained from the values of K and dielectric constant. The ${\mu}_{A+D-}$- values were in good agreement with the values of transition moment(${\mu}_{mn}$) which is calculated form the UV peak values. The large negative values of the electrical enthalpy (${\Delta}H_{el}^{\circ}$) and entropy (${\Delta}H_{el}^{\circ}$ ) have proved that NDMPI had a positive hydration. The positive values of entropy (${\Delta}S^{\circ}$) means the formation of NDMPI ion goes with dehydration.