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이주혁,김현남,정헌용,조성오 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
Background: Cosmic ray-induced particles can lead to failure of semiconductors packaged for export during air transport. This work performed MCNP 6.2 simulations to optimize shielding against neutrons and protons induced by cosmic radiation Methods and materials: The energy spectra of protons and neutrons by incident angle at the flight altitude were determined using atmospheric cuboid model. Various candidates for the shielding materials and the geometry of the Unit Load Device Container were evaluated to determine the conditions that allow optimal shielding at all sides of the container. Results: It was found that neutrons and protons, at the flight altitude, generally travel with a downward trajectory especially for the particles with high energy. This indicated that the largest number of particles struck the top of the container. Furthermore, the simulation results showed that, among the materials tested, borated polyethylene and stainless steel were the most optimal shielding materials. The optimal shielding structure was also determined with the weight limit of the container in consideration. Conclusions: Under the determined optimal shielding conditions, a significantly reduced number of neutrons and protons reach the contents inside the container, which ultimately reduces the possibility of semiconductor failure during air transport
중소기업 중간관리자의 앙트러프러너십(entrepreneursdhip) 역량 증진 프로그램 설계
이주혁,박수홍,김두규,남기곤 한국기업교육학회 2012 기업교육과인재연구 Vol.14 No.2
The purpose of this research is that middle manager's entrepreneurship competence increasing program’s implementation of the draft, and application and responses from real field to determine it’s appropriateness. Entrepreneurship is attributed to entrepreneur's leadership, mind, will and spirit. But this research defines entrepreneurship is competence for the field in group. Through individual’s ability, technology, mind conviction, it can be externally executed to have special influence individual, groups, and society. Crazy, perculiar, eccentricity, spectacular originality, and to put these into start to create new result with propulsion and practicality as the basic component, with these components, a program which will allow development and spreading as the internalization of program’s prototype. Therefore, creativeness and practicality was set as the core value. The competency was to be defined as the base of technique, skills, ability with challenging, creative as job competency. Through core values of creativeness and practicality into practice, the core process of the program was performed. With systematic action learning and 3-dimention mind frame and etcetera, performance of activities and processes’ environmental support, and company plan written practice, the Entrepreneurship’s 4 different component, creativeness, thinking power, problem solving skills, strategic planning, communication amplification, were used to make the program’s draft. There were in-depth anlysis of previous papers, journal, literature, and web, and communications through phone calls, emails and interviews were made with middle manager's, directors, and team leaders. Additionally, entrepreneurship establishment, team leadership education process, manager education process, middle's education process, creativeness education process, new business plan and etcetera, business planning related process and etcetera, were made to increase the practicality of application in the field work. This research was processed through utilizing development research, multi-level verification method and professional group’s interviews of program details, to increase the feasibility. 본 연구는 기업의 운영과 발전에 중추적 역할을 담당하는 중간관리자들의 앙트러프러너십 역량 증진 프로그램을 설계함에 목적을 두고 있다. 이러한 연구목적 달성을 위해 우선 문헌 및 사례분석, 심층면접을 통해서 중간관리자를 대상으로 앙트러프러너십 역량의 하위요소를 도출하였고, 핵심가치 추출 및 구현을 위해 프로그램 모형의 핵심 프로세스와 프로세스 지원요소를 구안하였다. 전문가 형성평가를 통해 프로그램 설계안의 강점과 개선점을 도출하였고, 수정, 보완작업을 거쳐 최종 프로그램을 설계한 후 타당도 검증을 실시하였다. 그 결과 앙트러프러너십을 기존의 개념적 정의에서 벗어나 역량의 개념으로 볼 수 있었고, 앙트러프러너십의 하위요소인 창의적 사고력, 문제해결력, 전략적 기획력, 커뮤니케이션을 프로그램 내용 전반에 유기적으로 연결될 수 있도록 하였다. 또한 프로그램 구성에 있어 앙트러프러너십의 하위역량 요소를 바탕으로 하면서도 팀 활동 및 실천성을 담보할 수 있는 비즈니스 전반의 프로세스 과정을 포함한 내용으로 구성하였다. 프로세스의 진행단계와 앙트러프러너십의 하위요소 간의 관계성을 중심으로 사업계획서 작성이라는 결과물을 통해 아이디어 활용 및 실제 업무현장에서 활용할 수 있는 생명력을 갖출 수 있는 프로그램이 될 수 있는 가능성을 제시하였다.
자가구동형 전자소자 구현을 위한 에너지 발전/저장 융합 기술 동향
이주혁 한국전기화학회 2018 한국전기화학회지 Vol.21 No.4
최근 늘어나는 배터리 수요를 대처하기 위하여 배터리를 대체하거나 배터리의 구동시간을 늘리기 위한 방법으로 제시되고 있는 에너지 발전소자와 에너지 저장소자의 융합연구는 에너지 관련 기술분야에서 가장 관심받고 있는 분야중 하나이다. 본 리뷰논문에서는 물리에너지 발전소자의 최근 연구동향과 함께 에너지 발전소자와 저장소자의 융합연구 동향을소개하고자 한다. 먼저, 물리에지를 전기에너지로 변환하는 압전 특성과 마찰대전 특성을 이용한 에너지 발전소자 관련 연구동향을 소개한다. 또한 압전/마찰대전 에너지 발전소자와 에너지 저장소자의 융합 연구동향을 소개한다. 특히 자가충전 에너지소자의 물리에너지를 전기화학적 에너지로 변환하는 새로운 접근방법을 소개하고자 한다.
이주혁 대한영상의학회 1989 대한영상의학회지 Vol.25 No.4
Mechanism of brain injury in dysbaric diving accident is controversial but likely are due to arterial gas embolization. We reviewed 6 CT cases among 4 patients of brain injury in dysbaric diving accident and evaluated the role of CT. Among 4 patients we can see diffuse low density in cerebral white matter in 2 patients focal low density in cortical and subcortical area of right frontal and left temporopatieral lobe in 1 cases and normal CT finding in 1 case. And we convinced that combination of MRI and follow up CT is useful for the evaluation of neuropathologic process and progress of injury during management.
토양 세척 후 발생하는 2차 폐수에서의 방사성세슘 제거 연구
이주혁,강재은,김원석 대한환경공학회 2020 대한환경공학회지 Vol.42 No.8
Objectives:Secondary wastewater is generated as the soil washing process proceeds to restore contaminated soil near the nuclear power plants (NPPs). In this study, we tried to evaluate the possibility of removing radioactive cesium from secondary wastewater through the adsorption process using illite. Methods:To treat radioactive cesium present in wastewater, as an adsorbent, we used illite collected from Yeongdong, Chungbuk, and weathering illite artificially weathered by high temperature and acid treatment (60℃, 0.01 M HCl). Before and after weathering, the adsorption rate of illite at low concentrations of cesium and the desorption rate of adsorbents were compared and evaluated using a 1.5 ppm of competitive potassium ion similar to that of groundwater. Results and Discussion:When the illite was artificially weathered, the amount of frayed edge sites increased as the interlayer ions in the illite eluted. As a result of the adsorption and desorption experiments, it was confirmed that the adsorption rate of weathering illite increased by about 11% in acid condition (pH 3) and about 26% in neutral condition (pH 6.2), and the desorption rate of weathering illite decreased by about 6% in acid and neutral conditions, compared to Yeongdong illite. Yeongdong illite and weathering illite showed higher adsorption rate under neutral condition than acidic condition, because the surface of the illite became negatively charged at high pH so the reactivity with cesium present as a cation increased. Conclusions:The artificial weathering process has improved the performance of illite as an adsorbent. We expect that weathering illite can be used as an effective adsorbent for the removal of radioactive cesium from NPP. 목적:본 연구에서는 원자력발전소 인근 방사성 세슘으로 오염된 토양의 복원을 위한 토양 세척공정에서 발생되는 2차 폐수 중의 방사성세슘을 일라이트를 이용한 흡착공정을 통해 제거 가능성을 평가해 보고자 하였다. 방법:본 연구에서는 폐수 중 존재하는 방사성세슘을 처리하기 위해 흡착제로 충북 영동에서 채취한 영동 일라이트와 이를 고온산처리(60℃, 0.01 M HCl)하여 인위적으로 풍화시킨 풍화일라이트를 이용하였다. 풍화 전후 저농도 세슘(1 ppm)에서의 일라이트의 흡착율을 비교하였으며, 경쟁 이온인 칼륨(1.5 ppm)을 이용하여 흡착제의 탈착율을 비교 및 평가하였다. 결과 및 토의:일라이트를 인위적으로 풍화시키면, 일라이트 내 층간 이온이 용출되면서 풍화된 모서리면의 양이 증가하였다. 흡착 및 탈착 실험 결과, 풍화일라이트의 흡착율은 영동 일라이트보다 산성 조건(pH 3)에서는 약 11%, 중성 조건(pH 6.2)에서는 약 26% 증가하였으며, 탈착율은 산성 조건(pH 3)과 중성 조건(pH 6.2)에서 약 6% 감소하는 것으로 나타났다. 영동 일라이트와 풍화일라이트는 산성 조건보다 중성 조건에서 흡착율이 높게 나타났는데, 이는 높은 pH에서 일라이트의 표면이 음전하를 띠게 되어 양이온으로 존재하는 세슘과의 반응성이 증가하였기 때문이다. 결론:인위적인 풍화과정울 통하여 흡착제로써의 일라이트 성능을 개선시켰으며 이는 원자력발전소에서 발생하는 방사성세슘 제거를 위한 효과적인 흡착제로 활용될 수 있음을 시사한다.
이주혁 대한영상의학회 1982 대한영상의학회지 Vol.18 No.4
Laparotomy was performed for resection of hepatoma in 34 cases at Seoul National University Hospital for 3$\frac{1}{2}$ years since Oct. 1978. Resection of hepatoma was done in 21 cases, ligation with or without cannulation of hepatic artery was performed in 12 cases, and open and closure was made in 1 case. Angiographic findings were analyzed for resectability of hepatoma. The results of the analysis were as follows: 1. Most reliable signs for resectable hapatoma were peripheral location and confinement in one hepatic lobe. Most reliable signs for non-resectable hapatoma were presence of tumor thrombus in portal vein, bilateral hepatic arterial feeding. 2. Less reliable signs for resectable hapatoma were absence of portal vein invasion, less than 10cm in size and absence of findings of liver cirrhosis. Less reliable signs for non-resectable hapatoma were right or left massive type. 3. Presence of arteriovenous fistula, more than 10cm in size, and presence of findings of liver cirrhosis were no reliable criteria for resectability of hepatoma. 4. Predictability for resectability with those reliable signs of angiography was around 80%. 5. In addition to routine celiac angiography, oblique celiac angiography or superior mesenteric arteriography for portal vein opacification will be helpful in order to obtain highly reliable signs for resectability of hepatoma.