Automatic velocity analysis using bootstrapped differential semblance and global search methods

Choi, Hyungwook,Byun, Joongmoo,Seol, Soon Jee Informa UK (TaylorFrancis) 2010 EXPLORATION GEOPHYSICS -AUSTRALIA- Vol.41 No.1

GPU를 이용한 이방성 탄성 거꿀 참반사 보정의 계산가속

최형욱 ( Hyungwook Choi ),설순지 ( Soon Jee Seol ),변중무 ( Joongmoon Byun ) 한국지구물리·물리탐사학회 2015 지구물리와 물리탐사 Vol.18 No.2

To yield physically meaningful images through elastic reverse-time migration, the wavefield separation which extracts P- and S-waves from reconstructed vector wavefields by using elastic wave equation is prerequisite. For expanding the application of the elastic reverse-time migration to anisotropic media, not only the anisotropic modelling algorithm but also the anisotropic wavefield separation is essential. The anisotropic wavefield separation which uses pseudo-derivative filters determined according to vertical velocities and anisotropic parameters of elastic media differs from the Helmholtz decomposition which is conventionally used for the isotropic wavefield separation. Since applying these pseudo-derivative filter consumes high computational costs, we have developed the efficient anisotropic wavefield separation algorithm which has capability of parallel computing by using GPUs (Graphic Processing Units). In addition, the highly efficient anisotropic elastic reverse-time migration algorithm using MPI (Message-Passing Interface) and incorporating the developed anisotropic wavefield separation algorithm with GPUs has been developed. To verify the efficiency and the validity of the developed anisotropic elastic reverse-time migration algorithm, a VTI elastic model based on Marmousi-II was built. A synthetic multicomponent seismic data set was created using this VTI elastic model. The computational speed of migration was dramatically enhanced by using GPUs and MPI and the accuracy of image was also improved because of the adoption of the anisotropic wavefield separation.

브랜드 이미지 및 구매에 영향 미치는 체험 특성에 관한 연구 -국내 화장품 플래그쉽 스토어를 중심으로-

최형욱 ( Choi Hyungwook ),김주연 ( Kim Jooyun ) 한국공간디자인학회 2020 한국공간디자인학회논문집 Vol.15 No.7

(Background and Purpose) The experience of a flagship store space changes the positive emotion of the customer’s brand and the result is brand marketing and identity formation through experience. In this respect, experiential characteristics are very important areas in the brand image and product purchase of the flagship store space, and the emotional elements of the buyer are induced to purchase through space experience. Therefore, the purpose of this study is to present the characteristics of experience in a dense manner based on the experience analysis frame for the characteristics and contents of experience that affect the brand image and purchase decision of a cosmetics flagship store space. (method) The study was conducted on the top six brands identified as a result of the statistics of the cosmetics brand recognition presented by the Korea Consumer Agency in 2019. To obtain objective results, a direct survey was conducted on the stores to analyze the contents through interviews, and characteristics of experiential details were classified into each and all stores. (Result) In the process of purchasing through visits to the cosmetics brand flagship store, it was analyzed that the emotional item evaluation factor among the characteristics of the sampling through the store space had a high influence on the brand image and purchase, and the other evaluation factors were analyzed in the order of experientialness, convenience, and intimacy. In the evaluation factors of sensory items among experience characteristics, visual was the most influential factor, followed by tactile sense, smell, and hearing. In addition, story and differentiation have a significant influence on the evaluation factors of cognitive items, and it was analyzed in order of interest and accessibility. Functional and physical properties had the highest influence on evaluation factors among behavioral characteristics, followed by selectivity and necessity. Moreover, in relational characteristics, the influence on identity and branding formation was high, and it was analyzed in order of community and mutuality. (Conclusion) The research questions on how the experience characteristics affect the brand image and product purchase of domestic cosmetics brand flagship stores were analyzed and synthesized through interviews. Through these results, it is recognized that the experience characteristics of cosmetics brands plays a very important role as a direct influence on brand image form and product purchase, and it is important data for future cosmetics flagship store planning, design, and research.

경 X선 형광분석을 위한 모세관 광학소자 제작

조형욱(Hyungwook Cho),박병훈(Byunghoon Park),김용민(Yongmin Kim),최철희(Chulhee Choi),최성희(Seonghee Choi),김기홍(Kihong Kim),천권수(Kwonsu Chon) 한국방사선학회 2011 한국방사선학회 논문지 Vol.5 No.6

경 X선 형광분석 기법에 사용되는 X선 튜브는 X선의 휘도가 낮아 분석의 정밀도가 떨어지고 분석 시간 또한 오래 걸린다. 모세관 집광소자를 이용하면 X선 휘도의 이득(gain)을 최소 10 이상 얻을 수가 있다. 모세관 광학소자는 8.4keV의 텅스텐 특성방사선을 효율적으로 집광할 수 있도록 설계되었다. 파이렉스 유리로 된 모세관 모재를 풀러 (puller)를 이용하여 45 g의 추에 650˚의 온도를 가하여 모세관 광학소자를 제작하였다. 모세관 광학소자의 제작은 총 460분이 소요되었으며 제작된 모세관 광학소자의 길이는 87 ㎜, X선 입사부의 직경은 300 ㎛, 출구부의 직경은 192㎛로 제작되었다. 제작된 모세관 광학소자를 경 X선 형광분석에 적용하면 황(S)과 같은 경원소 검출의 정밀도를 높일수 있을 것이다. An X-ray tube used an X-ray fluorescence analysis system has a low X-ray photon intensity which results in reducing measurement accuracy and increasing exposure time. These shortages can be overcame by using a monocapillary optics. A monocapillary optics was optimally designed for focusing the characteristic X-ray of tungsten (8.4 keV). The monocapillary optics can achieve a gain of 10 at the least. The monocapillary optics was fabricated by using puller and pyrex glass, raw material. In fabrication, a weigh of 45g and a temperature of 650˚ was loaded. The total fabrication time was 460 minutes. The fabricated capillary had 87 ㎜ in length and maximum diameter of 300 ㎛ and minimum diameter of 192 ㎛. When the fabricated monocapillary optics is applied to an X-ray fluorescence analysis system, the detection accuracy for soft elements, for example sulfur (S), will be improved.

화장품 플래그쉽 스토어 공간의 다감각 환경 특성에 관한 연구

최형욱 ( Choi Hyungwook ),김주연 ( Kim Jooyun ) 한국공간디자인학회 2020 한국공간디자인학회논문집 Vol.15 No.8

(Background and Purpose) The multi-sensory environment of store space plays an important role in the image and purchase of cosmetics flagship stores. Therefore, the study on the detailed items, elements, and factors of multisensory environment characteristics is necessary. Cosmetic flagship stores play an important role as a place for product purchase based on consumer experience, so multi-sensory stimulus factors felt by buyers in space are directly related to the formation of atmosphere, maximization of purchase, and promotion of brand preference, which are significant matters in purchasing. Therefore, this study aims to classify and analyze multi-sensory items and detailed factors for representative cosmetics brand flagship stores in Korea and abroad, and to present the results of the effect on the atmosphere, purchase, and preference in detail. (Method) The scope of the study was set as the subjects of the study for the top six brands with high recognition of cosmetics brands in 2019 based on the statistical data of the Korea Cosmetics Industry Research Institute and the Korea Consumer Agency among domestic and foreign cosmetics brands. The results of the analysis of the composition of the store space and the analysis of multi-sensory elements were conducted, and the results of the atmosphere, purchase, and preference were applied and classified using the Likert scale. (Result) In the atmosphere factor, it was analyzed that the visual color, brightness and tactile sense, and material had the main influence, and the factors that showed moderate influence were analyzed as the size of the visual base and the smell based scent. In addition, the factors that showed the least influence were the sound of music, temperature, and humidity, based on the olfactory sense. As such, the multi-sensory environment characteristics in the cosmetics brand flagship store space have an effect on the atmosphere, preference, and purchase of each factor of the five senses, and these results were summarized as having a significant effect on the brandingscape and identity formation of the cosmetics brand. (Conclusion) In summary, the space of the cosmetics brand flagship store has a very high impact on the store space atmosphere, brand preference, and purchase by the multi-sensory environment characteristics of the human body. The results obtained through various human sensory organs have a significant influence on the image and purchase of the brand in the future, and therefore, it is necessary to utilize it actively to maximize marketing by presenting space design and creative experience programs that enhance the purchasing effect.

전력계통운영시스템(EMS)의 재생에너지 출력 실시간 추정 방안

최형묵(HyungWook Choi),김태언(TaeEon Kim),이윤기(Yunki Lee),김완홍(WanHong Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10

국내 재생에너지는 그린뉴딜, 재생에너지 3020 등의 정부정책 추진에 따라 급격하게 증가하고 있다. 제9차 전력수급기본계획에 따라 전력거래소와 한전이 재생에너지 예측, 모니터링, 제어를 위해 실시간 정보공유 체계를 구축하고 있으나, 관련 시스템 구축이 완료될 때까지는 전계통 재생에너지 출력 추정값을 계통운영에 활용하여야 한다. 본 논문에서는 취득 중인 자료를 기반으로 재생에너지 중 풍력, 태양광 발전기의 전체 출력을 실시간으로 추정하는 방안에 대하여 연구하고자 한다.

시약의 성상에 따른 시약 관리 시스템

최형욱, 이종원, 정회경 배재대학교 공학연구소 2016 공학논문집 Vol.18 No.1

Recently for the safe and efficient management of reagents, Smart Reagent Cabinet Research is underway. The developed Smart Reagent Cabinet system manage’s the reagent information, like the reagent input, shipment record, information of the reagent in the cabinet, reagent cabinet information among other informations. However, there are not enough systems to manage and classifying the reagents and the properties of each reagent. In this paper, we design a reagent management system, applying 'Database Modeling' which classifies the existing reagents in Smart Reagent Cabinet System according to the properties and characteristics of the reagents. Therefore, it is considered that safe reagent management system will help manage the characteristics of each reagent separately. 최근 시약들을 안전하고 효율적으로 관리하기 위한 스마트 시약장 연구가 진행 중에 있다. 개발된 스마트 시약장은 시약 정보, 시약 입·출고 기록, 시약장 정보 등으로 나누어 시약들의 정보를 관리하고 있다. 하지만 시약들의 성상을 고려하여 관리하는 부분은 미비한 실정이다. 본 논문에서는 기존 스마트 시약장 시스템에 시약들이 가지는 성상과 특성에 맞춰 분류하는 데이터베이스 모델링(Database Modeling)을 적용한 시약 관리 시스템을 설계한다. 이에 따라 시약들이 가지는 각각의 특성에 맞는 관리 방법을 통해 안전한 시약 관리가 이루어질 것으로 사료된다.

한국인 발목관절에서 발꿈치종아리인대의 해부학적 특성 연구

권형욱(Hyungwook Kwon),조재호(Jaeho Cho),김디귿(Digud Kim),박광락(Kwangrak Park),이미정(Mijung Lee),최유진(Yujin Choi),윤관현(Kwanhyun Yoon),박정현(Jeonghyun Park) 대한체질인류학회 2020 해부·생물인류학 (Anat Biol Anthropol) Vol.33 No.3

발꿈치종아리인대는 발목의 안쪽번짐에서 발목의 안정성에 중요한 역할을 한다. 본 연구의 목적은 한국인 시신에서 발꿈치종아리인대의 인류학적 특성을 평가하여 임상에서 적용할 수 있는 기본적인 자료를 제공하는 것이었다. 재료는 포르말린으로 고정한 한국인 성인 시신 69구를 사용하여, 125쪽의 발을 해부하였다. 남자가 75쪽, 여자가 50쪽이었고, 사망시 평균 나이 76세였으며, 오른발이 63쪽, 왼발이 62쪽이었다. 발목을 중립자세로 한 후, 발꿈치 종아리인대의 부착부위를 확인하였다. 또한, 인대의 너비와 길이를 측정하였고, 발꿈치종아리인대와 앞목말종아리인대의 병합 유무와 두 인대가 이루는 각도를 측정하였다. 발꿈치종아리인대의 부착부위는 종아리뼈의 끝에서 8.6± 2.7 mm 떨어진 곳이었다. 인대의 너비는 종아리뼈부착부위가 7.4±1.5 mm, 인대의 정중간부위가 6.7±1.4 mm, 발꿈치뼈부착부위가 7.8±1.6 mm였으며, 인대의 길이는 22.0±2.7 mm였다. 발꿈치종아리인대와 앞목말종아리인대의 병합은 모든 발에서 확인되었으며, 두 인대가 이루는 각도는 113.8±16.6°였다. 인대의 길이는 남자가 여자보다 길었으며, 두 인대가 이루는 각도는 남자가 여자보다 컸다. 이 해부학적 자료는 발목의 해부학적 구조를 이해하고 발목 부상의 진단 및 치료에 도움이 될 것이다. The calcaneofibular ligament (CFL) plays an important role in ankle joint stability during inversion. The aim of this study was to evaluate anthropological characteristics of CFL in Korean cadavers and to provide fundamental data to clinicians. For this study, formalin-fixed 69 Korean cadavers were used and 125 feet (75 males and 50 females/63 right, 62 left) were dissected. The average age was 76.3 years old. In neutral position of ankle, the attachment area of the CFL was identified. Also, both width and length of the CFL were measured. In addition, the conjoined pattern and the angle between the CFL and the anterior talofibular ligament (ATFL) were measured. The attachment of the CFL averaged 8.6±2.7 mm at the tip of fibular. The width of the fibula attachment, that of the middle part of the ligament and that of the calcaneal attachment were 7.4±1.5 mm, 6.7±1.4 mm, and 7.8±1.6 mm respectively. The length of the CFL was 22.0±2.7 mm. The connection of the CFL and the ATFL was confirmed in all specimens, and the average angle between the CFL and the ATFL was 113.8±16.6°. The ligaments were longer in male than in female, and the angles between two ligaments were wider in male than in female. This data will be helpful for understanding the anatomical structure of the ankle ligament, as well as for the diagnosis and treatment of ankle ligament injury.

베이지안 관점에서 불확실성 추정을 통한 준 지도학습의 OOD 데이터 대응 전략

임형욱(HyungWook Lim),최동완(DongWan Choi) Korean Institute of Information Scientists and Eng 2023 한국정보과학회 학술발표논문집 Vol.2023 No.12

A case of IgM nephropathy in a patient with Neurofibromatosis type 1

( Min Seok Choi ),( Kyung Yoon Chang ),( Woo Jeong Kim ),( Hyungwook Kim ) 대한내과학회 2015 대한내과학회 추계학술발표논문집 Vol.2015 No.1

We report a rare case of steroid-responsive nephrotic syndrome with IgM nephropathy occurring in a patient with neurofibromatosis type 1 (NF-1). Introduction: NF-1 is the most common neurocutaneous disorder, and a genetic disorder. NF presents with cafe-au-lait spots, freckles near the axilla and groin, benign tumors of the peripheral nerve sheath called neurofibromas and hamartomas of the iris. Kidney can be also involved and most common presented with renal artery stenosis. Case: A 44-year-old woman presented with bilateral pretibial pitting edema, 9kg of weight gain with NF-1 features. Laboratory analysis showed that blood urea nitrogen 15.1 mg/dL creatinine 0.4 mg/dL total protein, 4.1 g/dL albumin, 1.6 g/dL triglyceride 254 mg/dL. The 24-hour urine protein was 7.56 g/day. On light microscopy of renal biopsy, there were no glomerular sclerosis, and mild mesangial expansion and mesangial cell proliferation. Immunofluorescent stainings were fine granular depositions of IgM in the mesangium. Electron microscopy revealed diffuse effacement of the epithelial foot processes and some electron dense deposits in the mesangium. This was consistent with IgM nephropathy. She had complete remission of proteinuria without relapse after 4 weeks of oral prednisolone 1 mg/kg/day tappering over 6 months. Conclusions: Although the mechanism and relationship of glomerulopathy and NF-1 is unknown, this case emphasized that steroid-responsive nephrotic syndrome with IgM nephropathy can be associated with NF-1.