영아 담도폐쇄증 진단에서 Tc-99m DISIDA 간담도주사와 경피간침생검의 의의

김우석,박우현,최순옥,김상표,Kim, Woo-Suk,Park, Woo-Hyun,Choi, Soon-Ok,Kim, Sang-Pyo 대한소아외과학회 1997 소아외과 Vol.3 No.1

본 저자들은 1992년 3월부터 1996년 4월까지 신생아 울체성 황달의 감별진단, 특히 신생아담도폐쇄증과 신생아 간염의 감별진단에 있어 Tc-99m DISIDA 간담도주사와 경피간침생검을 시행하여 다음과 같은 결과를 얻었다. 질환별로 볼 때 전체 60예의 환아 중에서 담도패쇄증이 23예, 신생아 감염이 34예였으며 경정맥고영양법으로 인한 황달이 2예, Alagille 증후군이 1예였다. Tc-99m DISIDA 간담도주사는 60명의 환아를 대상으로 실시하였다. BA 진단에 대한 민감도와 특이도는 각각 96%와 32%로서 높은 민감도를 보인 반면 특이도는 낮게 나타났으며 전체적인 진단 정확도는 57%였다. 경피간침생검은 Tc-99m DISIDA 간담도주사를 실시한 60명의 환아중 장관내 방사능이 나타나지 않았던 38명의 환아에서 40회 실시하였는데, 경피간침생검에 BA 진단에 대한 민감도는 88%, 특이도는 96%로 모두 높았으며 전체적인 진단 정확도는 93%였다. 본 연구를 요약하면 Tc-99m DISIDA 간담도주사는 특이도 32%, 양성예측율 47%로서 Tc-99m DlSIDA 간담도주사에서 장관내 방사능이 배설이 되지 않을 때는 경피간침생검이 반드시 필요하리라 생각되며, 일단 장관내 방사능이 배출되면 BA는 배제할 수 있으리라 생각된다. 경피간침생검은 전체적인 진단율이 93%로 높으나, BA 환아에서 8주전에 경피간침생검시는 NH와 감별이 어려울 수 있으며, 또 일부 NH, 경정맥고영양법 관련 울체성 황달에서는 경피간침생검시 BA와 감별이 어려울 수 있으므로, 임상경과를 보아서 의심스러우면 재 경피간침생검을 시행하던지 타 진단법을 응용해서 참고하여야 할 것으로 생각된다. To differentiate biliary atresia from intraheaptic cholestasis, Tc-99m DlSIDA hepatobiliary scintigraphies and percutaneous needle biopsies of 60 consecutive infants were evaluated retrospectively. Twenty three patients had biliary atresia and 37 patients intraheaptic cholestasis(neonatal hepatitis 34, TPN induced jaundice 2 and Dubin-Johnson syndrome 1). All sixty patients underwent Tc-99m DlSIDA hepatobiliary scintigraphy with phenobarbital pretreatment. Of 23 patients with biliary atresia, 22 were correctly interpreted showing 96% sensitivity while of 37 patients with intraheaptic cholestasis, only 12 had intestinal excretion of radionuclide showing 32% specificity. Among the forty needle biopsies, 17 of biliary atresia and 23 of intrahepatic cholestasis, 37 were correctly interpreted as either having biliary atresia or intrahepatic cholestasis. The overall diagnostic accuracy was 93%. Of 3 misdiagnosed cases, the histologic findings of two patients with biliary atresia(aged 43 days and 54 days at the first needle biopsy) were essentially the same as those of neonatal hepatitis. Follow-up biopsies, however, showed findings consistent with biliary atresia. The third one(VLBW premie with history of 8 weeks of TPN) showed mild ductal proliferation and portal fibrosis. This was interpreted as suspicious for biliary atresia. Jaundice resolved gradually. In summary, patients who have intestinal excretion of radionuclide on Tc-99m DlSIDA hepatobiliary scintigraphy, biliary atresia can be ruled out. But the patients who do not have intestinal excretion of radionuclide should have further investigation by needle biopsy. Judicious use of Tc-99m DISIDA hepatobiliary scintigraphy and percutaneous needle biopsy can give a diagnostic accuracy of 95% or more in cases of infantile cholestasis.

순환골재를 사용한 고강도 철근콘크리트보의 휨거동에 관한 연구

김우석,여진동,곽윤근,강현구,홍성걸,Kim, Woo-Suk,Yeo, Jin-Dong,Kwak, Yoon-Keun,Kang, Thomas H.K.,Hong, Sung-Gul 대한건축학회 2012 대한건축학회논문집 Vol.28 No.3

Currently, approximately 90% of waste concrete is being used solely for landfills. Of the total waste concrete only about 14% is made into aggregate and recycled. Such usage is a very low-efficiency method of recycling these materials, under-utilizing an important and valuable asset. Common engineering practice has thus far failed to promote the design of structural members using recycled aggregates. Moreover, appropriate structural design standards for such materials have not been established, despite the number of domestic research studies which have been, and are being, conducted. Such practices overlook the fact that the recycling of aggregate from demolished concrete structures is both structurally and economically beneficial. In making full use of recycled concrete aggregates (RCA) it is necessary to understand its mechanical properties such as compressive, tensile and flexural strengths, and bond strength, as well as its structural performance. The main objectives of this research study are the investigation of flexural performance and the evaluation of the potential applications of RCA on concrete structures. For this, flexural tests of 12 reinforced high-strength concrete beams with RCA were performed. The current test data were examined in terms of flexural strength, along with the data from previously tested reinforced concrete beams with RCA. It is anticipated that this research will play a role of establishing the structural design standards for concrete members with RCA.

복합섬유로 보강된 순환골재 콘크리트의 성능평가에 관한 연구 사례 고찰

김우석,곽윤근,Kim, Woo-Suk,Kwak, Yoon-Keun 한국복합신소재구조학회 2015 복합신소재학회논문집 Vol.6 No.2

비분산 적외선 분광법을 이용한 Co₂농도 고속 분석기의 Sampling Module 특성에 관한 실험적 연구

김우석,손덕영,박영무,유재석,이종화,Kim, Woo-Seok,Shon, Deok-Young,Park, Young-Moo,Yoo, Jae-Suk,Lee, Jong-Hwa 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.3

A fast response analyzer for measuring carbon dioxide concentration has been developed for transient characteristic and researches tested on internal combustion engine. The analyzer uses the well known NDIR(Non-Dispersive Infrared) method with miniaturized detection system, giving a time constant of approximately 30 microsecond, and sampling module consists of capillary tube. Since the transit time and the time constant of the sampling system depend on the sampling conditions, it is necessary to investigate the characteristics of sampling system before applied to exhaust gas measurement in engine. A unique method was designed to study the influence of the diameter of transfer sample line and operating conditions of the FRNDIR on transit time and time constant. A database of transit time and time constant was built up for different measured and simulated pressure conditions. The database can be used for correcting eventual $CO_2$ concentration measurement.

순환골재 RC보의 전단강도에 관한 고찰

김우석(Kim, Woo Suk),이정훈(Lee, Jung-Hoon),백승민(Baek, Seung-Min),강현구(Kang, Thomas H.-K.),곽윤근(Kwak, Yoon Keun) 한국콘크리트학회 2012 한국콘크리트학회 학술대회 논문집 Vol.2012 No.5

Isolator를 적용한 콘크리트 교량의 면진설계

김우석(Kim, Woo-Suk),김승기(Kim, Seung-Ki) 한국콘크리트학회 2014 한국콘크리트학회 학술대회 논문집 Vol.2014 No.5

남성 생활체육지도자의 성태도가 감정분화 및 성폭력 인식에 미치는 영향

김우석(Kim, Woo-Suk),한광령(Han, Kwang-Leoung),김기섭(Kim, Ki-Sup),윤영준(Yoon, Young-Jun) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.6

This paper aims to examine the influence of community male physical education instructors’ sexual attitude on emotional differentiation and awareness of sexual violence. To that end, research questions were set as follows. First, how is the influence of community male physical education instructors’ sexual attitude on emotional differentiation? Second, how is the influence of community male physical education instructors’ sexual attitude on awareness of sexual violence? Third, how is the influence of community male physical education instructors’ emotional differentiation on attitude about sexual violence? Randomly sampled as subjects are 350 community male physical education instructors, who belonged to National Life Sports Association and that had one year experience in working at community’s public sports facilities and commercial sports facilities in Seoul and Gyeonggi region. A questionnaire was used for the survey. 329 effective answered copies of questionnaire were analyzed, using frequency analysis, reliability analysis, factor analysis, correlational analysis, and multi regression analysis. The research findings revealed this: First, male physical education instructors’ sexual attitude partially influences emotional differentiation. Second, male physical education instructors’ sexual attitude partially influences awareness of sexual violence. Third, male physical education instructors’ emotional differentiation partially influences awareness of sexual violence.

파라계 아라미드섬유 보강 순환굵은골재 RC보의 구조성능평가

김우석 ( Kim Woo-suk ),이헌석 ( Lee Heon-seok ),아지모프엘리욧 ( Azimov Elyorjon ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.1

In this study, structural tests were performed for the para-aramid fiber-reinforced RC beams using Recycled Coarse Aggregates (RCA) according to the main parameters which are RCA replacement ratio (0 and 30%) and para-aramid fiber volume fraction (0, 0.75 and 1.0%). Experimental results show that by reinforcing para-aramid fibers, compared with the natural coarse aggregate, the RCA, which exhibited low structural performance, improved load carrying capacity and ductility.

목차 : 고층아파트 화재시 발코니 확장에 따른 화재 위험성에 관한 실험 연구

김우석 ( Woo Suk Kim ),김화중 ( Wha Jung Kim ),이광원 ( Gwang Won Lee ),이지희 ( Ji Hee Lee ) 한국안전학회(구-한국산업안전학회) 2012 한국안전학회지 Vol.27 No.2

Changes in the styles of communities are leading of increases in the number of high-rise apartments and commercial-apartment structures. Tall high-rise structures, while presenting unique economies of scale and cost effectiveness tend to be highly engineered and complex structures. In the event of a fire, this complexity in design also results in a complexity in the behavior of fire propagation and control. High-rise structures are among the most potentially dangerous due to the high population density in the building, and the inherent limitations on evacuation and on fire control services. One of the most critical points of fire propagation is the movement of fire through the outer wall structures. Controlling such propagation is essential in controlling the spread of the fire throughout the building itself, as well as controlling the potential for its spread to adjacent buildings. In this study, we will be examining the potential for fire control design and effects mitigation using a 1/4.5 scale model. The primary focus of the study will be the effects of extended balconies into the structure of high-rise apartments. The authors will also consider the effectiveness of reduced-scale model tests.

정보보호 : 엔트로피를 이용한 ShellCode 탐지 방법

김우석 ( Woo Suk Kim ),강성훈 ( Sung Hoon Kang ),김경신 ( Kyung Shin Kim ),김승주 ( Seung Joo Kim ) 한국정보처리학회 2014 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.3 No.3

해커들은 웹 사이트를 해킹 또는 경유 사이트를 운영하는 등 다양한 방법으로 목적을 달성하기 위한 해킹을 시도한다. 악성코드를 웹 사이트에 업로드하여 경유 사이트를 만드는 경우 해당 사이트에 접속하는 사용자는 좀비 PC가 되어 아이디와 패스워드 및 개인 정보가 대량 유출되고 해킹된 개인정보들은 다른 해킹 방법에 사용되고 있다. 기존의 탐지기법은 Snort rule을 사용하여 패턴을 IDS/IPS 장비에 입력하여 네트워크에서 패턴이 일치되면 탐지하는 기법으로 동작하고 있다. 하지만 입력된 패턴을 벗어난 공격을 하였을 경우 IDS/IPS 장비에서는 탐지하지 못하고 정상적인 행위로 간주하여 사용자 PC를 감염시킨다. 공격자는 패턴 탐지 방법의 취약점을 찾아 ShellCode를 진화시킨다. 진화된 ShellCode 공격에 대응하여 악의적인 공격을 탐지 및 대응할 수 있는 방법의 제시가 필요한 실정이다. 본 논문은 정보량 측정을 통한 ShellCode를 탐지하는 방법에 관한 연구이며, 기존의 보안 장비를 우회하여 사용자PC에 공격 시도를 탐지하는 방법을 제시한다. Hackers try to achieve their purpose in a variety of ways, such as operating own website and hacking a website. Hackers seize a large amount of private information after they have made a zombie PC by using malicious code to upload the website and it would be used another hacking. Almost detection technique is the use Snort rule. When unknown code and the patterns in IDS/IPS devices are matching on network, it detects unknown code as malicious code. However, if unknown code is not matching, unknown code would be normal and it would attack system. Hackers try to find patterns and make shellcode to avoid patterns. So, new method is needed to detect that kinds of shellcode. In this paper, we proposed a noble method to detect the shellcode by using Shannon`s information entropy.