흉벽종괴의 CT와 MR 소견

김동우 대한영상의학회 1995 대한영상의학회지 Vol.33 No.1

Purpose: To evaluate the characteristic radiological findings of various diseases forming chest wall masses byCT and MR. Materials and methods: We retrospectively reviewed CT and MR findings of the chest wall masses in 31patients. Morphology, density, features of contrast enhancement , and location of the mass within the bony thoraxor soft tissue were analyzed. Results: Benign lesions of bony thorax were osteochondritis(n=2), tuberculosis(n=1), and osteochon droma(n=1). Malignant lesions of bony thorax were Ewing's sarcoma(n=1) and metastasis(n=3). Benignlesions of soft tissue were abscess(n=1), tuberculosis(n=7), lipoma(n=1), cavernous hemangioma(n=2), cavernouslymphangioma(n=1), and neurofibroma (n=1). Malignant lesions of soft tissue were lymphoma(n=1), spindle cellsarcoma(n=1), metastasis(n=8). Tuberculosis of the chest wall (n=8) were ill-defined hypodense(n=7) orisodense(n=1) mass than surrounding muscle on pre-enhanced CT scan. All massess showed peripheral rim enhancementafter contrast enhancement. Five cases were associated with pulmonary or pleural tuberculosis. All malignantlesions of bony thorax showed bone destruction, but inflammatory processes also showed bone destruction. MR showedcharaceristic signal intensity in the case of lipoma(n=1) and hemangioma(n=1). Conclusion: We conclude that CT andMR are helpful for differential diagnosis of chest wall masses.

당뇨병에 병발한 알코올성 간질환의 치험례

김동우,전찬용,한양희,박종형,여은경,Kim, Dong-Woo,Jun, Chan-Yong,Han, Yang-Hee,Park, Jong-Hyeong,Yeo, Eun-Kyoung 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.4

We had applied Saenggangunbitang, Gamijihwangtang, and Saenggangunbitang-Gamijihwangtang on a alcoholic liver disease patient with diabetes mellitus, Saenggangunbitang has been used to treat alcoholic liver disease and had known to have beneficial effects. Gamijihwangtang has been used to treat Yin deficiency syndrome in Orient Medicine. We observed clinical symptom, liver function, nutritional state and blood sugar. After first administration, Clinical symptom and blood sugar were improved by Gamijihwangtang medication. Alter second administration, Clinical symptom, blood sugar and liver function were improved by Saenggangunbitang-Gamijihwangtang medication. After third administration, clinical symptom and liver function were improved by Saenggangunbitang medication. It is possibly suggested that Saenggangunbitang-Gamijihwangtang medication has a therapeutic effect on alcoholic liver disease with diabetes mellitus.

온실가스 배출 감축 정책의 환경, 에너지, 경제적 효과 분석을 위한 통합형 전력 산업 모형의 구축과 응용

김동우,김인숙 한국환경경제학회·한국자원경제학회(구 한국환경경제학회) 2018 한국환경경제학회 학술발표논문집 Vol.2018 No.하계

비이진 내재적 피드백 자료를 위한 변형된 베이지안 개인화 순위 방법

김동우,이은령 한국통계학회 2017 응용통계연구 Vol.30 No.6

Bayesian personalized ranking (BPR) is a state-of-the-art recommendation system techniques for implicit feedback data. Unfortunately, there might be a loss of information because the BPR model considers only the binary transformation of implicit feedback that is non-binary data in most cases. We propose a modified BPR method using a level of confidence based on the size or strength of implicit feedback to overcome this limitation. The proposed method is useful because it still has a structure of interpretable models for underlying personalized ranking i.e., personal pairwise preferences as in the BPR and that it is capable to reflect a numerical size or the strength of implicit feedback. We propose a computation algorithm based on stochastic gradient descent for the numerical implementation of our proposal. Furthermore, we also show the usefulness of our proposed method compared to ordinary BPR via an analysis of steam video games data. 베이지안개인화순위(Bayesian personalized ranking) 방법은 내재적 피드백 자료를 분석하는 최첨단 추천시스템 통계기법 중 하나이다. 하지만, 기존의 베이지안개인화순위 방법은 내재적 피드백 자료를 변환한 이진 자료만을 고려하기 때문에 정보의 손실이 있을 수 있다는 단점이 있다. 이를 해결하기 위해 본 논문에서는 내재적 피드백 자료의 수치적 크기에 기반한 확실함의 정도(level of confidence)를 고려하는 변형베이지안개인화순위 방법을 제안한다. 제안한 방법은 기존 방법처럼 상품간의 개인선호도에 관한 직관적인 확률모형 구조를 여전히 지니면서 내재적 피드백의 수치적 크기를 확실함의 정도로 반영할 수 있다는 점에서 유용하다. 또한 제안한 변형 베이지안개인화순위 방법을 수치적으로 구현하기 위해 확률그라디언트하강(stochastic gradient descent) 기법에 기반한 계산 알고리즘을 제시한다. 마지막으로, 스팀 비디오 게임 실제 데이터 분석을 통하여 기존방법에 비해 우수한 성능을 입증한다.

2P-407 Structural optimization of All Solid State Dye Sensitized Solar Cells

김동우,전소연,( Ho Phuong ),( Rajesh Cheruku ),안광순,김재홍 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

Dye-sensitized solar cells (DSSCs) have been investigated extensively because of their high energy conversion efficiency, low cost and simple fabrication process. However, the liquid electrolyte based DSSC have many problems such as leakage of liquid electrolyte, corrosion of Pt counter and dye degradation which can limit the long-term stability of DSSCs. For such reasons, the all solid-state dye sensitized solar cells (SDSCs) have been attracting much attention for decades. In this study, we fabricated SDSCs using organic dyes that was designed and synthesized as sensitizer for SDSC. All solid-state solar cells were prepared with different structure of organic dyes and their photovoltaic properties were investigated and compared with that of liquid type of DSSCs.

황복, Takifugu Obscurus의 초기성장과 이석의 미세구조

김동우,한경남,임양재 한국해양학회 2003 바다 Vol.8 No.3

실험실에서 황복을 부화 후 1일에서 63일까지 사육하면서 표본을 추출하여 황복의 초기성장과 이석의 미세구조 관찰하였다. 부화 당시 황복의 전장은 3.09$\pm$0.02 mm였으며, 부화 후 10일에 전장 4.96$\pm$0.24 mm, 20일에는 5.39$\pm$0.42 mm, 30일에는 9.13$\pm$0.59 mm로 성장하였고, 부화 후 34일에는 평균 10.78$\pm$0.96 mm로 성장하였으며, 부화 후 43일에는 16.40$\pm$2.31 mm, 부화 후 63일에는 30.49$\pm$1.53 mm로 성장하였다. 부화한 황복 이석의 평균 장반경은 14.20$\pm$1.21 $\mu\textrm{m}$였고, 부화 후 10일째는 31.06$\pm$2.31 $\mu\textrm{m}$, 20일째는 57.19$\pm$6.19 $\mu\textrm{m}$, 34일째는 127.13$\pm$13.13 $\mu\textrm{m}$, 43일째는 190.79$\pm$17.08 $\mu\textrm{m}$, 63일째는 281.85$\pm$23.81 $\mu\textrm{m}$로 부화 후 20일 이후의 이석의 크기변화는 체장의 성장 경향과 유사하였다 황복의 이석에는 다른 성장선들과 구별되는 부화정지선이 형성되어있으며, 부화정지선 형성이전에 2-3개의 미세성장선이 관찰되었다. 부화 후 20일부터 63일까지, 황복의 이석에 형성된 일일성장선의 수와 경과한 일수는 1차 비례관계를 보였으며, 하루에 한 개씩 형성되어지는 것이 확인되었다. Microstructure of otoliths and early growth in total length of laboratory-reared river puffer, Takrifugu obscurus were observed from 1 to 63 days after hatching. The total length of Takifugu obscurus was 3.09${\pm}$0.02 mm, 4.96${\pm}$0.24 mm, 5.39${\pm}$0.42 mm,9.13${\pm}$0.59 mm, 10.78${\pm}$0.96, 16.40${\pm}$2.31 mm, 30.49${\pm}$l.53 mm in 1, 10, 20, 30, 34, 43, 63 days respectively. The mean radius of otoliths was 14.20${\pm}$1.21 $\mu\textrm{m}$ in 1 day, 31.06${\pm}$2.31 $\mu\textrm{m}$ in 10 days,57.19${\pm}$6.19 $\mu\textrm{m}$ in 20 days,127.13${\pm}$13.13 $\mu\textrm{m}$ in 34 days,190.79${\pm}$17.08 $\mu\textrm{m}$ in 43 days and 281.85${\pm}$23.81 $\mu\textrm{m}$ in 63 days after hatching. Growth of otoliths were similar to the growth pattern in total length during 20-63 days after hatching. Hatch mark was distinguished with other growth increments and within a hatch mark two or three increments were observed. The number of growth increments was correlated with the days after hatching between 20 and 63 days after hatching.

저궤도위성통신 중심의 군 통합네트워크 운영개념과 운영효과도 분석

김동우 한국멀티미디어학회 2023 멀티미디어학회논문지 Vol.26 No.4

In this study, an operational concept for an integrated military network required by the Korean military for future battlefield environments is proposed. It is centered on low Earth orbit(LEO) satellite communication. The proposed operational concept is to integrate the existing geostationary satellite network and terrestrial network into the LEO satellite network, with a focus on the latter. A simulation of network traffic considering future operational environments is performed to analyze the operational effectiveness of the proposed integrated military network. Results confirmed that the integrated network is more effective in terms of network traffic than when operating the existing terrestrial network and LEO satellite network as separate networks.

간헐폭기 활성슬러지 공법에 생물전기화학MBR을 적용한 선박 하·폐수 처리 장치 상용화 연구

김동우,이강,류두현,김탁현,임승주 대한환경공학회 2018 대한환경공학회 학술발표논문집 Vol.2018 No.11

X-box를 이용한 Session-oriented Cross play에 대한 보안 요구사항 분석

김동우,강수영,김승주 한국정보보호학회 2019 정보보호학회논문지 Vol.29 No.1

Recent technological advances and industry changes, the game industry is maximizing fun by supporting cross-play thatcan be enjoyed by different platform users in PC, Mobile and Console games. If the boundaries are lost through the crossplay, unexpected security threats can occur due to new services, even if existing security is maintained above a certainlevel. The existing online game security researches are mostly fraud detection that can occur in PC and mobile environment,but it is also necessary to study the security of the console game as cross play becomes possible. Therefore, this papersystematically identifies the security threats that can occur when enjoying cross play against console game users usingSTRIDE and LINDDUN threat modeling, derives security requirements using the international common evaluation standard. 최근 기술의 발달과 산업의 변화를 통해 게임업계는 PC와 Mobile 그리고 Console game에서 서로 다른 플랫폼 유저가 함께 즐길 수 있는 크로스플레이를 지원하여 재미를 극대화 하고 있다. 크로스플레이를 통해 플랫폼의 경계가 없어지면 기존의 보안이 일정수준 이상 유지되었더라도 새로운 서비스로 인해 예상치 못한 보안위협이 발생 할수 있다. 기존에 진행된 온라인 게임보안 연구는 PC와 Mobile환경에서 발생 가능한 부정행위 탐지가 대부분이지만크로스플레이가 가능해짐에 따라 Console game에 대한 보안연구 역시 필요하다. 따라서 본 논문은 Consolegame 유저를 대상으로 크로스플레이를 즐길 때 발생 가능한 보안위협을 STRIDE와 LINDDUN 위협모델링을 활용하여 체계적으로 식별하고 국제공통평가기준을 활용해 보안요구사항 도출하여 크로스플레이에 대한 평가 기준을제시한다.

삼봉강룡반어탕(三蓬薑龍半魚湯)과 가감소적백출산(加減消積白朮散)의 항암효과(抗癌效果)에 대(對)한 비교연구(比較硏究)

김동우,고승희,최유경,심문기,여은경,박세기,박종형,고재철,전찬용,한양희,이청정혜,Kim, Dong-Woo,Ko, Seung-Hi,Choi, You-Kyung,Shim, Mun-Ki,Yeo, Eun-Kyung,Park, Se-Ki,Park, Chong-Hyeong,Ko, Jae-Chul,Jun, Chan-Yong,Han, Yang-Hee,Lee, Chung- 대한한방내과학회 2000 大韓韓方內科學會誌 Vol.21 No.3

Objective : It is well known that Gagamsojeokbackchool-san show antitumor effects and its activities are result from enhancement of immune function, we investigated the antitumor effects of Sambonggangyongbaneo-tang and its mechanism. Methods : We measured change of body weight, weight of immune organs (Spleen, Thymus), Liver, Kidney, tumor weight, cytotoxicity for investigation of antitumor effects of Sambonggangyongbaneo-tang. Results : 1. The body weight of mouse has no significant difference between control and sample groups. 2. The weights of immune organs (Spleen and Thymus) decreased significantly in sample groups. The weights of Liver and Kidney have no significant difference. 3. The tumor weights in mouse decreased significantly in sample groups and showed dose-dependent effect. 4. Cell viability of Sarcoma 180 has no significant difference in sample groups. 5. HeLa cell viability has no significant difference in low concentration, but it decreased significantly in high concentration. Conclusions : According to the above results, it could be suggested that Sambonggangyongbaneo-tang has prominant antitumor effects and cytotoxicity.