부산·경남지역 퇴적 점토의 함수비를 이용한 압밀정수 산정 연구

강성욱,김대환,김태형,정진교,주인곤,Sung-Uk Kang,Dae-Hwan Kim,Tae-hyung Kim,Chin-Gyo Chung,In-Gon Joo 한국지반신소재학회 2024 한국지반신소재학회 논문집 Vol.23 No.1

In this study, physical property tests and standard consolidation tests were conducted on the marine clay of Busan New Port and North Port, the middle and lower reaches of the Nakdong River including Gimhae and Yangsan, and Ulsan regions. The moisture content, a property unrelated to sample disturbance with small individual test errors, was used for regression analysis with the compression index, virgin compression index, consolidation coefficient, expansion index, and secondary compression index, among others. Subsequently, the correlation and accuracy were evaluated. Upon analyzing the correlation between the moisture content, void ratio, and liquid limit commonly used physical properties for calculating compression indexes, it was confirmed that the liquid limit had the lowest correlation. Through a linear regression analysis of the consolidation constants using the current moisture content in the natural state, a high correlation was demonstrated. Relationship equations were then presented to determine settlement and settlement time. This study suggests that moisture content can be utilized as an alternative for evaluating and calculating consolidation constants when examining ground settlement in sedimentary clays distributed in the Busan and Gyeongnam regions.

쐐기형 수중음파 흡수타일의 음반사 특성 연구

강성욱,홍우영,송영일,류기상,백칠기,Kang, Sung-Oug,Hong, Woo-Young,Song, Yeong-Il,Lyu, Ki-Sang,Baek, Chil-Ki 한국음향학회 1997 韓國音響學會誌 Vol.16 No.3

쐐기각이 다른 4종류의 쐐기형 수중음파 흡수타일을 설계, 제작하고 각각의 흡음타일에 대한 반사음장의 크기를 측정하였다. 흡음타일의 정면에서 측정한 반사음장의 크기는 실험한 4개의 타일중 쐐기의 꼭지각이 30$^{\circ}$일 때 최소값을 갖고 120$^{\circ}$일 때 최대값을 가졌다. 쐐기형 흡음타일의 꼭지각이 클수록 그 반사계수가 증가되는 것을 확인하였다. 또한 본 실험에 사용된 10kHz~30kHz 주파수 범위에서 쐐기각이 같은 흡음판에 의한 반사음장의 크기는 주파수와 무관하였다. 그리고 쐐기형 흡음타일 후면에서 측정한 반사음장의 크기는 흡음판의 형태와 실험에 사용된 주파수들에 무관한 일정한 값을 가졌다. 쐐기형 흡음타일의 반사음장에 대한 측정값과 수치모델에 의한 계산값은 대체로 잘 일치하였다. Four different wedge angle absorptive tiles were designed and made, and the magnitudes of the reflected acoustic fields by the wedge shaped underwater sound absorptive tiles were measured. The minimum magnitude was found at the angle of 30$^{\circ}$ and the maximum of it was found at the wedge angle of 120$^{\circ}$ from measured the reflected acoustic fields at the front sides of the tiles. The fact that as wedge angle of the absorptive tile increases, the reflection coefficient is increasing is verified. The measured reflected acoustic fields were not dependent on the frequency in the range of 10kHz~30kHz used in this experiment for the same wedge angle tile. The measured reflected acoustic fields at the back sides of the tiles show that they are independent from both type of the absorptive tiles and the frequencies used in the experiments. The measured values and the computed values by the numerical model for the reflected acoustic fields of the wedge shaped absorptive tiles are fairly well comparable with one another.

복시(複視)(Diplopia)를 호소하는 Guillain-Barre Syndrome(GBS) 환자 치험 1례 증례보고

강성욱,문미현,홍석훈,황충연,강정란,박준영,Kang, Sung-Wook,Moon, Mi-Hyun,Hong, Suk-Hoon,Hwang, Chung-Yeon,Kang, Jeong-Ran,Park, Joon-Young 대한한방안이비인후피부과학회 2005 한방안이비인후피부과학회지 Vol.18 No.3

Guillain-Barre Syndrome (GBS) is an acute inflammatory demyelinating polyneuropathy. It is disorder in which the body's immune system, attacks parts of the peripheral nervous system. It is characterized by the rapid onset of weakness, paralysis of the legs, arms, breathing muscles and face. But the analysis of CSF and electrical tests on nerve and muscle function can be performed to confirm the diagnosis. Most cases occur shortly after a viral infection. This is a clinical ease report on Cuillain-Barre Syndrome with diplopia. The patient, a 52-year-old man had a weakness in both legs and diplopia. His weakness and diplopia improved after oriental medical treatment, so this is reported as a potential treatment. Objective: This study was designed to evaluate the effects on oriental medicine therapy on Guillain-Barre Syndrome with diplopia. Methods & Result: The Clinical data was analyzed on a patient with Cuillain-Barre Syndrome whose main symptoms were diplopia. The patient was treated by acupuncture and oriental medicine. As a result, symptoms was improved remarkably. Conclusion: The patient showed weakness and diplopia. After acupuncture and oriental medicine treatment, weakness and diplopia was improved in 4weeks after visit to clinic. The study suggests that oriental medicine treatment is effective on Cuillain-Barre Syndrome.

복합지반 EPB TBM 커터교체를 위한 그라우팅 수행 사례

강성욱,장재훈,이재원,김대영,신영진,Kang, Sung-Wook,Chang, Jaehoon,Lee, Jae-Won,Kim, Dae-Young,Shin, Young-Jin 한국터널지하공간학회 2021 한국터널지하공간학회논문집 Vol.23 No.5

Railway projects have been consistently increasing in Korea. In relation to this trend, the mechanized tunneling using Tunnel Boring Machine (TBM) is preferably applied for mining urban areas and passing under rivers. The TBM tunneling under difficult grounds like mixed faces with high water pressure could require ground improvements for stable TBM advance or safe cutter head intervention (CHI). In this study, pre-grouting works for CHI in Daegok-Sosa railway project are presented in terms of the grouting zone design, the executions and the results, the lessons learned from the experience. It should be mentioned that the grouting from inside TBM was carried out several times and turned out to be inefficient in the project. Therefore, grouting experiences from the surface are highlighted in this study. Jet grouting was implemented on CHI points on land, while permeation grouting off shore in the Han River, which mostly allow to access the cutter head of TBM in free air with stable faces. The results of CHI works have been analyzed and the lesson learned are suggested. 철도망 구축이 확대되는 추세 속에 도심지나 한강을 통과하기 위해 TBM 굴착공법 적용사례가 증가하고 있다. 특히, 도심지나 한강하저를 통과하는 경우 불량한 지반 및 지하수조건을 조우하게 되며 안정적인 굴진 및 커터교체(Cutter Head Intervention, CHI)를 위해서 그라우팅을 적용하고 있다. 본 논문에서는 TBM 굴착공법을 적용한 철도 터널 시공 시 적용한 그라우팅에 대하여 소개하고자 한다. 특히, CHI를 위해 그라우팅을 수행한 사례에 대한 소개나 분석이 많지 않은 것으로 판단하여 CHI를 위한 그라우팅 범위산정, 수행결과, 고찰 및 제언(Lessons Learned)을 기술하고자 한다. 그라우팅은 막장안정성을 확보하는 목적이 있으며, 작업위치에 따라 지상(수직)그라우팅과 TBM 장비 내에서 수행하는 갱내 그라우팅으로 나눌 수 있다. 갱내그라우팅을 수행한 결과 공기 및 보강효과 측면에서 지상(수직) 그라우팅에 비해 비효율적이라고 판단되어 지상그라우팅으로 계획을 변경하였다. 한강하저 구간의 경우 슬러지 발생으로 인한 환경오염, 주입재 유실 등이 우려되어 고압분사그라우팅을 적용할 수 없었으며 대안으로 수중불분리 주입재를 적용한 저압그라우팅을 적용하였다. 육상구간은 지상 작업부지를 확보할 수 있어 고압분사그라우팅을 적용하였다. 실제 그라우팅을 수행한 결과를 소개함으로써 향후 쉴드 TBM을 적용한 터널 시공 중 CHI 시 지반조건에 따른 적합한 그라우팅 공법 및 방법을 결정하는데 기초자료로 활용될 수 있을 것으로 기대된다.

민간검진 서비스의 이용현황과 결정요인

강성욱,유창훈,권영대,Kang, Sung-Wook,You, Chang-Hoon,Kwon, Young-Dae 대한예방의학회 2009 예방의학회지 Vol.42 No.3

Objectives : Both organized and opportunistic screening programs have been widely used in Korea. This paper examined the determinants of the use of opportunistic screening programs in Korea. Methods : The subjects were a national stratified random sample of 10,254 people aged 45 or older from the first wave of the Korean Longitudinal Study of Ageing in 2006. A logit model was used to examine the determinants of the use of opportunistic screening programs in terms of the demographic and socioeconomic characteristics, the type of health insurance and the health status. Results : Thirteen point seven percent of the individuals received opportunistic screening programs within 2 years from the time the survey was conducted in 2006. The individuals who graduated from college or who had even more education were 3.0 times more likely to use opportunistic screening programs compared with the individuals who were illiterate. The individuals who resided in urban areas and who had religious beliefs were more likely to receive opportunistic screening programs compared with their counterparts. Those who were in the first quartile for the total household assets were 2.6 times more likely to use opportunistic screening programs than those who were in the fourth quartile for the total household assets. Privately insured people were 1.6 times more likely to use opportunistic screening programs than those who were not insured. Finally, the individuals who self-assessed their health status as worst were 2.1 times more likely to use opportunistic screening programs compared individuals who self-assessed their health status as best. Conclusions : This study suggests that opportunistic screening programs can be an indicator for whether or not an individual is among the advantaged group in terms of their socioeconomic characteristics and type of health insurance.

PVT 측정을 통한 비결정 고분자 ABS와 SAN의 압축률과 체적팽창 연구

강성욱,김성훈,Kang, Seong-Wook,Kim, Seong-Hun 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.5

The specific volume change of polymer occurs to various reactions of mechanical stress, chemical reaction, glass transition and crystallization and so on. In regular state, the specific volume of material as function of temperature and pressure is changed. The experimental and theoretical equations of state (EOS) are Tait equation and Simha-Somcynsky equation for amorphous polymer and Simha-Jain theory for crystalline polymer. This study carried out measurement of the specific volume as function of temperature and pressure using Gnomix pressure-volume-temperature (PVT) and the measured data were fitted two domain Tait equation. These results that the difference of the measured and calculated value were almost same less than 0.1% and 10 parameters which were obtained Tait fitting use to calculate compressibility and volumetric expansivity of amorphous polymers. The used ABS resins were same butadiene rubber content at 16 wt% but they had different rubber size. ABS1 consisted of only one rubber size and ABS2 consisted of two rubber sizes. The compressibility and volumetric expansivity of ABS1 was higher than those of BS2. However, for the difference of volumetric expansivity between 0 and 100 MPa, ABS2 was slightly lower than ABS1.

가정간호서비스의 사회적 비용 절감 효과에 관한 연구: 슬관절 치환술 환자를 중심으로

강성욱 ( Sung Wook Kang ),권영대 ( Young Dae Kwon ),고수경 ( Su Kyoung Ko ),지남주 ( Nam Ju Ji ) 한국보건경제정책학회(구 한국보건경제학회) 2005 보건경제와 정책연구 Vol.11 No.2

포스터 발표 : 하수처리 ; PGA와 슬러지 가용화를 이용한 하수고도처리에 관한 연구

강성욱 ( Sung Ouk Kang ),김동하 ( Dong Ha Kim ),최지은 ( Ji Eun Choi ) 대한상하수도학회 2007 공동추계 학술발표회 논문집 Vol.2007 No.-

ABS 나노복합재료와 이를 적용한 내화창호시스템의 개발 : 파트 I: ABS 나노복합재료의 개발

강성욱(Sungwook Kang),권민재(Minjae Kwon),최정윤(J. Yoon Choi) 한국화재소방학회 2020 한국화재소방학회논문지 Vol.34 No.5

본 연구에서는 건축물의 구성재 중 하나인 커튼월구조 창호시스템의 저단열성 알루미늄 프레임 부분에 대해 가연성이 개선된 고단열성 ABS-나노클레이 복합재료(이하 나노복합재료)를 적용하여 건축물의 에너지 효율성과 화재안전성 확보 모두에 기여하고자 한다. 파트 I에서는 ABS의 가연성 개선을 위해 (i) 클레이를 나노 분산(CTAB / Mica)시키고 (ii) 다공성 탄화발포 보호층을 형성시키는 팽창형 수지(Intumescent material)를 첨가한 나노복합재료를 개발한다. 이 과정에서 클레이의 분산성을 높이기 위해 친수성인 클레이를 친유성으로 개질하였고, ABS 구성물의 극성을높이기 위해 수지에 그라프트 공중합(ABS-g-MAH)을 시켰다. 개선된 성능 확인을 위해 X-ray diffraction (XRD),Transmission electron microscopy (TEM), Thermogravimetric analysis (TGA), Differential scanning calorimetry (DSC), Laserflash apparatus (LFA), Cone calorimeter 실험을 수행하였고 그 결과를 기반으로 창호시스템 프레임 내 적용을 위한최적배합비로서 ABS-g-MAH : CTAB / Mica : Intumescent = 100 : 5 : 35 (phr)로 결정하였다. 파트 II에서는 연구실단계에서 개발된 재료를 생산 단계로 스케일업하여 내화창호시스템 파일럿 모델을 제작하고 그 내화성능의 확인을위해 벤치스케일 및 실스케일 내화실험하는 과정을 다룬다. This study is focused on the development of a curtain-wall-type fire-resistant glazing system to contribute to both energyefficiency and fire safety of a building. The weakness of the aluminum frame on thermal insulation was supplemented byan ABS nanocomposite material with a superior thermal insulation performance. It contained (i) a maleic-anhydride-graftedABS to improve the dispersion of clay, (ii) nanoscale clay, and (iii) intumescent material to retard the combustion on theexposed surface of the polymer. A series of X-ray diffraction, transmission electron microscopy, differential scanningcalorimetry, LFA, and cone calorimetry tests were carried out to analyze the degree of improvement in flame retardancyand optimize the compound ratio. In Part II (the authors’ companion paper), the ABS nanocomposite material based on theoptimized compound ratio was scaled up for application to a fire-resistant glazing system in industries. Bench- and full-scaletests were performed to confirm the system’s performances in terms of both thermal resistance and insulation.

병원 방사선사의 직무만족도 관련 요인

강성욱 ( Sung Wook Kang ),김건엽 ( Keon Yeop Kim ),최세묵 ( Se Mook Choi ),서순림 ( Soon Rim Suh ),배석환 ( Seok Hwan Bae ) 경희대학교 경영연구원 2012 의료경영학연구 Vol.6 No.1

The purpose of this research was to investigate factors affecting the level of job satisfaction of radiologic technologists who are working at hospitals. This research has been achieved by self-administered questionnaires of 263 radiologic technologists from the 26 hospitals which were located in Gyeongbuk province from March 15th to April 5th, 2011. The questionnaires consisted of general characteristics, job-related characteristics, environmental variables, psychological variables, structural variables and job satisfaction etc. The average score of job satisfaction was 3.21. Those who had a religion or when the present job agreed with the desired job, the job satisfaction was higher(p<0.05). The average score of environmental, psychological and structural variables were each 3.02, 3.28, and 3.08. The associated factors with the higher score in environmental variables were younger age, unmarried, when the duration of working in present hospital was lower than 5 years or the present jobs agreed with the desired jobs(p<0.05). In psychological variables, those who had higher score were man, higher education, with religion, higher income, or when the present jobs agreed with the desired jobs were high(p<0.05). In structural variables, those who had higher score were older age or higher income(p<0.05). The statistically significant variables of multiple regression analysis associated with job satisfaction were religion, psychological variables, and structural variables. As a result, understanding of professional job, pride in the job and providing opportunities that they can show their abilities should be considered to have high level of job satisfaction.