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김형욱 ( Hyeong-wook Kim ),엄남일 ( Namil Um ),오정근 ( Jung Keun Oh ),이영기 ( Young-kee Lee ),김기헌 ( Ki-heon Kim ) 한국폐기물자원순환학회 2019 한국폐기물자원순환학회지 Vol.36 No.2
Transactions of venous resources such as products, parts, materials, etc., which have been recently used and discharged as waste, are actively underway in the East Asian region. Venous resources have the potential to be both volatile and environmentally polluting, and there is a risk that the possibility of contamination will surface if international trade is activated without institutionalized regulations of the export/import system. This type of environmental pollution has been reported in some areas such as China. In order to prevent such a situation in advance, it is necessary to establish an accurate institutional infrastructure for domestic venous resources so that the quality of the market can be maintained smoothly. Therefore, it is necessary to appropriately control the illegal parts of the venous resource market through proper legal oversight of informal flow within the country.
Hydrothermal Carbonization (HTC)을 이용한 혼합 유기성폐기물 bio-coal의 특성 평가
김형욱 ( Hyeong Wook Kim ),조우리 ( Woori Cho ),이재영 ( Jai-young Lee ) 한국폐기물자원순환학회 2020 한국폐기물자원순환학회지 Vol.37 No.2
In this study, a mixture of sewage sludge, paper sludge, and food waste was hydrothermally carbonized to produce a renewable solid fuel. Hydrothermal carbonization (HTC) does not need a drying step, so it is a proper method to make biofuels from wet feedstocks. Fuel properties of the bio-coals produced via HTC of mixtures of sewage sludge, paper sludge, and food waste with different ratios were characterized. As the ratio of food waste in the mixture was increased, the content of fixed carbon and heating value were increased. Coal banding analysis proved that the ratio of carbon/ hydrogen/oxygen of the bio-coals were similar to those of a low-grade coal.
김형욱 ( Hyeong-wook Kim ),엄남일 ( Nam-il Um ),김우일 ( Woo-il Kim ),이영기 ( Yung-kee Lee ),김기헌 ( Ki-heon Kim ) 한국폐기물자원순환학회 2019 한국폐기물자원순환학회지 Vol.36 No.4
China banned the import of solid waste at the end of 2017 due to serious environmental pollution problems caused by the illicit import and smuggling of solid wastes by illegal dealers. As a result of this measure, plastic wastes from Europe and other countries in the world have entered into the domestic plastic recycling market, and domestic recycling collection companies have refused to collect plastic waste. As a result, China’s import bans have reduced exports of domestic plastic waste by 57%, and have increased imports of plastic waste from Japan, Europe, and other countries. In addition, the prices of domestic PET, PE, and PP compression products fell due to the drop in international oil prices. Contract prices for recyclable resources in apartment complexes declined 25% in March of 2018 compared to March of 2017, and contract prices after the refusal of collection in April 2018 decreased 7% from March. In the case of solid fuel production of waste vinyl, which is difficult to separate, it is difficult to satisfy quality standards when manufacturing solid fuel because it contains foreign materials. Therefore, additional production is small in addition to the obligation to recycle due to the declining price competitiveness of solid fuel products.
다양한 평가방법을 이용한 원형 노치 CT 시편의 피로수명평가
장동주(Dong-Joo Chang),강주연(Ju-Yeon Kang),허남수(Nam-Su Huh),김진원(Jin-Weon Kim),김종성(Jong-Sung Kim),김윤재(Yun-Jae Kim),김대수(Dae-Soo Kim),김형욱(Hyeong-Wook Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
In the present work, the fatigue life of a round-notched compact tension (CT) specimen has been evaluated using two different fatigue life evaluation methods. One is Design-By-Analysis (DBA) procedure given in ASME B&PV Code, Sec. III and the other is structural stress based approach provided in ASME B&PV Code, Sec. VIII. The fatigue crack initiation tests were conducted using a round-notched CT specimen, which is made of SA312 TP316 stainless steel, under displacement-controlled cyclic condition, and then experimental fatigue initiation life of that specimen was measured. To predict fatigue life of this CT specimen using DBA based approach, 3-D elastic FE analyses were carried out using experimental condition, and fatigue life was predicted based on both design and best-fit fatigue curve of same material suggested in ASME B&PV Code, Sec. II. Moreover, the fatigue life of CT specimen was also investigated using the structural stress based approach. Finally, the fatigue lives predicted either based on DBA procedure or structural stress based approach were compared with experimental results, and the accuracy of such engineering fatigue life evaluation methods was discussed.
하수차집관로 준설토양의 콘크리트골재 적용성 평가에 관한 연구
김준하,김형욱,김인식,이재영,Kim, Joon-Ha,Kim, Hyeong Wook,Kim, In-Sik,Lee, Jai-Young 한국지하수토양환경학회 2017 지하수토양환경 Vol.22 No.2
Recently, the gap between demand and supply of natural aggregate has increased owing to the depletion of aggregate sources. Therefore, policy support is necessary for the stable supply of aggregate resources. Public and construction works experience problems when they do not receive a steady supply of aggregate. Further, instabilities in aggregate supply lead to increases in aggregate prices, and consequently construction costs. As a result, the likelihood of poor construction using low-grade aggregate increases. It is therefore crucial to put measures in place that deal with these issues. This study aims to reduce the load imposed by aggregate use on the environment by recycling soil dredged from sewage ducts to reduce the gap between supply and demand of fine aggregate. The dredged soil is assessed using an applicability test for quality characteristics and solidification with basic properties. This study aims to secure the safety of dredging soil and solidified objects through interior physical and chemical analyses and to utilize it as a base material for concrete solidification in the future.
출혈을 동반한 위 지방종의 내시경적 점막 절제술을 이용한 내시경적 제거
이정욱 ( Jung Wook Lee ),김수진 ( Su Jin Kim ),최철웅 ( Cheol Woong Choi ),강대환 ( Dae Hwan Kang ),김형욱 ( Hyung Wook Kim ),박수범 ( Su Bum Park ),남형석 ( Hyeong Seok Nam ),유대곤 ( Dae Gon Ryu ) 대한내과학회 2020 대한내과학회지 Vol.95 No.6
Most upper gastrointestinal lipomas occur in the duodenal second portion, and gastric lipomas are rare. Most lipomas are usually asymptomatic, but symptoms such as abdominal pain, intussusception, ulceration, and intestinal obstruction may occur depending on the size and location and, rarely, can cause bleeding. Endoscopic polypectomy, endoscopic mucosal resection, and surgical resection are the treatments of choice for lipomas with intestinal obstruction or bleeding. Upper gastrointestinal bleeding from lipoma is mostly of duodenal origin and very rarely from the stomach. Here, we report a case of successful treatment of gastric lipoma with massive bleeding by endoscopic resection. (Korean J Med 2020;95:398-403)
내시경 절제술 적응증이 되는 조기 위암에서 림프절 전이 예측을 위한 전산화단층촬영술의 유용성
김수진 ( Su Jin Kim ),김태언 ( Tae Un Kim ),최철웅 ( Cheol Woong Choi ),강대환 ( Dae Hwan Kang ),김형욱 ( Hyung Wook Kim ),박수범 ( Su Bum Park ),남형석 ( Hyeong Seok Nam ),유대곤 ( Dae Gon Ryu ) 대한소화기학회 2017 대한소화기학회지 Vol.70 No.1
목적: 본 연구는 내시경 절제술의 적응증에 해당하는 조기 위암의 림프절 병기 설정에서 복부 전산화단층촬영술의 유용성을 평가하고, 정확도에 영향을 주는 인자에 대해 알아보고자 하였다. 대상 및 방법: 2009년 3월부터 2016년 3월까지 수술 전 복부 전산화단층촬영술을 시행하고 위 절제술 및 림프절 곽청술을 시행 받은 환자들 중 내시경 절제술의 적응증에 조기 위암을 가진 268명의 환자들을 대상으로 하였다. 결과: 내시경 절제술의 적응증에 해당하는 조기 위암의 전산화단층촬영술 림프절 병기의 정확도는 86.1% (235/268명)였다. 전산화단층촬영술에서 림프절 전이가 의심되는 환자들에서 수술 후 병리 결과 림프절 전이가 없었다. 림프절 전이는 확대적응증에 해당하는 조기 위암을 가진 7명의 환자에서 확인되었으며, 이들 모두 전산화단층촬영술에서 림프절 비대는 없었다. 궤양 및 궤양반흔이 전산화단층촬영술 위양성과 관련이 있었다(odds ratio 3.56; 95% confidence interval 1.56-8.15). 결론: 내시경 절제술 적응증에 해당하는 조기 위암의 림프절 병기 평가로 복부 전산화단층촬영술의 신뢰도는 제한적이었다. Background/Aims: This study evaluated the value of abdominal computed tomography (CT) in preoperative N staging of early gastric cancers (EGCs) within standard and expanded indications of endoscopic resection (ER) and investigated the factors affecting accuracy. Methods: Between March 2009 and March 2016, a total of 268 patients with EGC within the standard and expanded indications of ER underwent preoperative abdominal CT and surgical gastrectomy with lymph node (LN) dissection. Preoperative N staging of CT was compared with the pathologic result. Results: The accuracy of N staging for EGCs within the standard and expanded indications was 86.1% (235/268). There was no LN metastasis in patients with cN1 in CT staging. LN metastasis was found in 7 patients with EGCs that met the expanded ER indication and cN0 in CT staging. According to the univariate analysis, ulcers, including scars, were associated with the false positive of lymph node metastasis in abdominal CT (odds ratio 3.56; 95% confidence interval 1.56-8.15). Conclusions: The present study suggests that the value of abdominal CT is limited for nodal staging of EGCs that meet the ER indication. (Korean J Gastroenterol 2017;70:21-26)
일 병원의 순환교대근무와 주간고정근무 여성 간호사의 근무형태에 따른 정신신체 증상
김병조,최말례,김태형,김형욱,은헌정,Kim, Byoung-Jo,Choi, Mal-Rye,Kim, Tae-Hyung,Kim, Hyeong-Wook,Eun, Hun-Jeong 한국정신신체의학회 2014 정신신체의학 Vol.22 No.2
연구목적 일 종합병원에 근무하는 여성 간호사 중 순환교대자와 주간고정근무자 두 군 간의 정신신체 증상의 차이를 조사하였다. 방 법 일 종합병원에서 근무하는 여성 간호사의 인구학적 정보를 수집하여, 두통의 강도(VAS), 두통의 유형, 두통의 빈도를 알기위한 질문지와 우울척도(BDI), 전반적 수면평가지(GSAQ)를 사용하였다. 통계분석은 Mann-Whitney test와 ${\chi}^2$ test를 사용하였다. 결 과 전체 대상군 84명 중 순환군이 37명, 주간군이 47명이었다. 순환군이 주간군보다 젊고 미혼이 많았고 근무연수가 적었다. 순환군이 주간군보다 두통, 불면, 과다 주간졸리움증, 우울, 불안과 같은 정신신체 증상이 통계학적으로 유의하게 많았다. 결 론 종합병원의 순환교대근무 여성간호사가 주간근무자보다 더 많은 두통, 불면, 과다 주간졸리움증, 우울, 불안을 보였다. Objectives : Shift work disorder occurs when you have difficulties adjusting to a work schedule that takes place during a time which most people sleep. Some people may have diverse psychosomatic symptoms, such as sleep problems, depression, anxiety, and headaches even after the shift work schedule ends. The aims of this study are to compare difference of psychosomatic symptoms between rotating shift and daytime working nurse groups. Methods : Volunteer nurses working in a general hospital were recruited in a general hospital. We collected sociodemographic data. We used questionnaires for headache type, headache frequency, and VAS(Visual Analog Scale) for headache intensity, BDI(Beck depression Inventory) and GSAQ(Global Sleep Assessment Questionnaire). We used Mann-Whitney test and Chi-square test for hypothesis testing. Results : Data collected from 84 women nurses. Rotating shift(N=37) working nurses showed younger, more unmarried, and shorter work periods than daytime working nurses (N=47). Also rotating shift group showed more problems of headache, insomnia, excessive daytime sleepiness, depression and anxiety than daytime group. The above results were statistically significant. Conclusions : The rotating shift work women nurses produced more headache, insomnia, excessive daytime sleepiness, depression, and anxiety than daytime working ones.