• 한국환경과학회지
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• 제27권9호
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• pp.763-770
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• 2018

Bioremediation in situ is heavily dependent on the oxygenic environment which would privide the dwelling microorganism with sufficient oxygen. The situation could be easily resolved with supply of an Oxygen Releasing Compound (ORC). In this paper we prepared that sort of material out of oyster shell powder (mostly calcium carbonate) that prevails every shore areas of the country. We used two different oxidizing methods in the first step of the whole manufacturing process-conventional heating in a furnace and an ultrasound generator to obtain calcium oxide. Then that calcium oxide was further oxidized into calcium peroxide which may release oxygen under a moisturized condition. The oxygen releasing experiments were run to test the performance of our products, and to determine the gas kinetics during the experiments. Interestingly, calcium peroxide derived from ultrasound treatment was much more energy-effective as ORC than that from furnace heating although the heat derived process was better than that of ultrasound in terms of oxygen content and its releasing rate. We also found that most of the data collected from the gas releasing experiments fairly supported an ordinary $1^{st}$ order kinetics to oxygen concentration, which shaped a sharp discharge of oxygen at the very early moment of each test.

• 한국방사선학회논문지
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• 제14권5호
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• pp.705-713
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• 2020

동맥경화는 혈관이 좁아지면서 탄력을 잃어 혈액 순환 장애가 발생하는 질병으로, 최근 증가하는 심혈관 및 뇌혈관 질환의 잠재적 원인이 된다. 경동맥초음파 검사는 동맥경화 정도를 평가하여 심혈관 및 뇌혈관 질환의 예측인자로 사용되고 있다. 이에 본 논문은 경동맥초음파 검사에서 내중막 두께 증가와 여러 임상변수들 간 상관성을 알아보고자 하였다. 경동맥초음파검사 소견을 가지고 있는 환자를 대상으로 경미한 내중막 두께 비후, 경화반, 유의한 협착 3단계로 분류하였다. 경동맥의 동맥경화 정도와 신체적 특성(성별, 연령, 신체질량지수법, 혈압), 혈액검사(총콜레스테롤, 중성지방, 고밀도지단백질, 저밀도지방단백질, 크레아틴포스포키나제, 공복혈당)와 동맥경화도 검사에서 계측된 CAVI(Carotid Ankle Vascular Index : 혈관연령) 데이터를 수집하였다. 경동맥 내중막 두께는 고혈압, 고지혈증, BMI 등의 변수와 상관관계가 있었으며, 또한 CAVI가 증가될수록 심혈관계 질환의 위험요인과 상관관계가 있음을 확인하였다.

• 비파괴검사학회지
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• 제36권6호
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• pp.474-482
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• 2016

가벼운 다공성 구조재로서 널리 사용되는 캘빈 폼(foam) 재료의 탄성특성을 초음파를 이용하여 조사하였다. 캘빈 폼의 구조는 tetrakaidecahedron의 단위 셀(unit cell)이 규칙적으로 3차원 배열된 구조를 갖고 있는데 본 연구에서는 SoildWorks 프로그램에서 캘빈 단위 셀을 설계하고 ABS 플라스틱 재료를 이용하여 3차원 프린터로 제작한 후 초음파시험을 수행하였다. 캘빈 구조체는 기공이 많은 재료이기 때문에 초음파가 투과할 수 없어서 빈 공간을 모두 파라핀 왁스로 충진하여 초음파가 투과할 수 있도록 하였다. 파라핀을 충진한 캘빈 구조체는 초음파의 비행시간(TOF)을 이용하여 초음파 속도를 계산한 후, 이 복합 구조체에 대한 탄성 구조 모델을 기반으로 캘빈 구조체만의 탄성계수를 계산하였다. 측정된 캘빈 구조체의 탄성계수 값은 모재(ABS 플라스틱) 탄성계수의 약 3.4%가 되는 것으로 나타났는데 이 평가 결과는 선행된 연구 결과들에서 나타난 실험값이나 이론 해석 결과와 잘 일치하는 것을 확인할 수 있었다.

• 한국전문물리치료학회지
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• 제26권3호
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• pp.99-105
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• 2019

Background: Although magnetic resonance imaging is accurate, it is expensive to measure the movement of temporomandibular joint. The three-dimensional (3D) motion analysis system is an inexpensive measurement tool. Objects: This study examined the reliability of quantifying the mouth opening and lateral mandibular shift and differences between individuals with and without temporomandibular disorder (TMD) using the hygienic method of surface markers on the skin with 3D ultrasound-based motion analysis. Methods: This study included 24 subjects (12 with and 12 without TMD). Temporomandibular joint motion during mouth opening was recorded using two surface markers with 3D ultrasound-based motion analysis. An intraclass correlation coefficient [ICC (3,k)] was used to confirm the intrarater reliability of quantifying kinematic temporomandibular joint motion, and an independent t-test was used to evaluate differences in maximal mouth opening and lateral mandibular shift between the two groups. Results: Assessment of mouth opening and lateral mandibular shift showed excellent test-retest reliability with low standard error of measurement. The lateral mandibular shift and opening-lateral mandibular shift ratio were significantly increased in the TMD group during maximum mouth opening (p<.05). However, no significant difference in maximal mouth opening was observed between the groups with and without TMD (p>.05). Conclusion: This hygienic and simple surface marker method can be used to quantify the mouth opening and lateral mandibular shift at the end-range of mouth opening. The TMD group showed an increased lateral mandibular shift movement at the end-range of mouth opening. The lateral mandibular shift movement can be regarded as a symptom in the diagnosis and treatment of TMD.

• Korean Journal of Radiology
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• 제20권5호
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• pp.781-790
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• 2019

Objective: To assess the relationship between contrast-enhanced ultrasound (CEUS) parameters and perfusion CT (PCT) parameters of gastric cancers and their correlation with histologic features. Materials and Methods: This prospective study was approved by our Institutional Review Board. We included 43 patients with pathologically-proven gastric cancers undergoing CEUS using SonoVue^® (Bracco) and PCT on the same day. Correlation between the CEUS parameters (peak intensity [PI], area under the curve [AUC], rise time [RT] from 10% to 90% of PI, time to peak [TTP_US], and mean transit time [MTT_US]) and PCT parameters (blood flow, blood volume, TTP_CT, MTT_CT, and permeability surface product) of gastric cancers were analyzed using Spearman's rank correlation test. In cases of surgical resection, the CEUS and PCT parameters were compared according to histologic features using Mann-Whitney test. Results: CEUS studies were of diagnostic quality in 88.4% (38/43) of patients. Among the CEUS parameters of gastric cancers, RT and TTP_US showed significant positive correlations with TTP_CT (rho = 0.327 and 0.374, p = 0.045 and 0.021, respectively); PI and AUC were significantly higher in well-differentiated or moderately-differentiated tumors (n = 4) than poorly-differentiated tumors (n = 18) (p = 0.026 and 0.033, respectively), whereas MTT_CT showed significant differences according to histologic types (poorly cohesive carcinoma [PCC] vs. non-PCC), T-staging (≤ T2 vs. ≥ T3), N-staging (N0 vs. N-positive), and epidermal growth factor receptor expression (≤ faint vs. ≥ moderate staining) (p values < 0.05). Conclusion: In patients with gastric cancers, CEUS is technically feasible for the quantification of tumor perfusion and may provide correlative and complementary information to that of PCT, which may allow prediction of histologic features.

• 한국원자력학회:학술대회논문집
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• 한국원자력학회 2005년도 춘계학술발표회
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• pp.1154-1155
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• 2005

• Archives of Plastic Surgery
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• 제34권2호
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• pp.237-242
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• 2007

Purpose: Gynecomastia is an abnormal increase in the volume of the male breast. Patients affected by gynecomastia with significant glandular enlargement may respond to suction alone and/or sharp dissection and excision. The purpose of this report is to introduce the indications and results of authors' two techniques. Methods: The diameter of parenchyme was determined by a pinch test after liposuction. For the parenchymal diameter less than 4 cm, ultrasound-assisted liposuction was performed, in conjunction with the "pull-out technique" to effectively remove the fibrofatty tissue of the male breast through a single 5-7 mm incision. For the parenchymal diameter more than 4 cm, ultrasound-assisted liposuction and excision were applied through 2.5 cm periareolar approach. Results: A total of 94 patients (185 breasts) underwent the operation from October 2000 to October 2003 and mean follow-up period was 12 months. The volume of aspirates ranged from 50 to 450 cc per breast. There were no major complications such as skin flap necrosis. Five reoperations were performed for 1 hypertrophic scar, 2 under-resected and 2 hematoma cases. The patient's satisfaction was high and most of them were pleased with the shape of the breasts and scars. Conclusion: These procedures can minimize scars and reduce the incidence of contour problem such as saucer deformity, and provides consistent results. Patients can return to full activities in 48 hours. It can be offered as an option for the treatment of gynecomastia.

• 대한물리의학회지
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• 제7권3호
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• pp.319-327
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• 2012

Purpose : This study aimed to identify the asymmetry observed in the rehabilitative ultrasound imaging of lateral abdominal muscle thickness and performance between the affected and unaffected side during the abdominal drawing-in maneuver (ADIM), an exercise used to facilitate activation of selectively TrA to stabilize the trunk prior to limb movement. Methods : The Participants were twenty one patients with post-stroke hemiplegia in this study. Ultrasound imaging was used to measure amount of changes in thickness of the external oblique (EO), internal oblique (IO), transversus abdominis (TrA). A Paired t-test was used to compare relaxed muscle thickness to contracted muscle thickness of all 3 muscles between the affected and unaffected sides. Results : The outcome measures included side to side differences of absolute thickness, contraction ratio among the lateral abdominal muscles. There was no significantly difference in between the affected and unaffected side at rest. But, there was a significantly difference in absolute muscle thickness between the affected and unaffected side of only TrA muscle. Also contraction ratio was a significantly difference between the affected and unaffected TrA muscle. Conclusion : These findings support the asymmetrical activation of TrA muscle during abdominal muscle contraction in patients with post-stroke hemiplegia. Further studies are warranted for confirming this outcome.

• 한국구조물진단유지관리공학회 논문집
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• 제24권1호
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• pp.142-147
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• 2020

본 연구의 목적은 콘크리트 재료 및 구조물의 균열 특성 평가에 활용되고 있는 확산초음파 기법의 적용 가능성을 검토하는데 있다. 이를 위한 첫 단계로 외부 환경에 따라 변화하는 콘크리트의 수분 함유량 변화를 묘사하여, 확산초음파 파라미터와 콘크리트 수분 함유량 사이의 상관관계 분석을 수행하였다. 실험실 환경에서 완전 건조된 실험체를 수중에서 포화시켜가며 콘크리트 함수율의 차이를 묘사하였으며, 콘크리트 내부에서 초음파의 산란 현상이 충분히 발생하는 500 kHz 주파수 대역대의 신호를 가진 및 분석하여 확산초음파 파라미터인 초음파 확산계수와 초음파 에너지 소산계수를 산정하였다. 콘크리트의 수분 함유량은 확산초음파 실험 시 실험체의 무게 변화를 통해 추정하였으며, 수분 함유량 증가에 따라 실험체에서 무게가 약 2.5 % 가량 증가한 것으로 나타났다. 콘크리트 실험체의 포화정도에 따라 초음파 확산계수는 지속적으로 증가하는 것으로 나타났으나, 변화율은 확산초음파 기법의 계측 오차 범위 내에 있었다. 반면에, 초음파 에너지 소산계수는 완전 포화된 콘크리트에서 완전 건조된 콘크리트 대비 약 120 % 증가하여, 수분함유량에 대해 민감한 것으로 나타났다. 따라서, 추후 확산초음파 기법을 활용하여 콘크리트 재료 및 구조물의 균열 특성 평가 시 함수율에 대한 고려가 필요할 것으로 사료된다.

• International journal of advanced smart convergence
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• 제8권1호
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• pp.24-34
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• 2019

In this research, a practical deep learning framework to differentiate the lesions and nodules in breast acquired with ultrasound imaging has been proposed. 7408 ultrasound breast images of 5151 patient cases were collected. All cases were biopsy proven and lesions were semi-automatically segmented. To compensate for the shift caused in the segmentation, the boundaries of each lesion were drawn using Fully Convolutional Networks(FCN) segmentation method based on the radiologist's specified point. The data set consists of 4254 benign and 3154 malignant lesions. In 7408 ultrasound breast images, the number of training images is 6579, and the number of test images is 829. The margin between the boundary of each lesion and the boundary of the image itself varied for training image augmentation. The training images were augmented by varying the margin between the boundary of each lesion and the boundary of the image itself. The images were processed through histogram equalization, image cropping, and margin augmentation. The networks trained on the data with augmentation and the data without augmentation all had AUC over 0.95. The network exhibited about 90% accuracy, 0.86 sensitivity and 0.95 specificity. Although the proposed framework still requires to point to the location of the target ROI with the help of radiologists, the result of the suggested framework showed promising results. It supports human radiologist to give successful performance and helps to create a fluent diagnostic workflow that meets the fundamental purpose of CADx.