인공지능 기반 GOCI-I/-II 대기상한 반사도 활용 고해상도 남한 지역 초미세먼지 지상농도 추정

임정호,이주현,최현영,박선영 한국기상학회 2024 한국기상학회 학술대회 논문집 Vol.2024 No.4

논문 : 흐름수역에 방류되는 부력제트의 연안귀환

임정호 관동대학교 1992 산업기술논문집 Vol.- No.7

Surgery Alone Versus Surgery Followed by Chemotherapy and Radiotherapy in Resected Extrahepatic Bile Duct Cancer: Treatment Outcome Analysis of 336 Patients

임정호,성진실,이익재,박준성,윤동섭,김경식,이우정,박경란 대한암학회 2016 Cancer Research and Treatment Vol.48 No.2

Purpose This study analyzed the outcomes of patients with resected extrahepatic bile duct cancer (EHBDC) in order to clarify the role of adjuvant treatments in these patients. Materials and Methods A total of 336 patients with EHBDC who underwent curative resection between 2001 and 2010 were analyzed retrospectively. The treatment types were as follows: surgery alone (n=168), surgery with chemotherapy (CTx, n=90), surgery with radiotherapy (RT) alone (n=29), and surgery with chemoradiotherapy (CRT, n=49). Results The median follow-up period was 63 months. The 5-year rates of locoregional failure-free survival (LRFFS), distant metastasis-free survival (DMFS), progression-free survival (PFS), and overall survival (OS) for all patients were 56.5%, 59.7%, 36.6%, and 42.0%, respectively. In multivariate analysis, surgery with RT and CRT was a significant prognostic factor for LRFFS, and surgery with CTx was a significant prognostic factor for DMFS, and surgery with CTx, RT, and CRT was a significant prognostic factor for PFS (p < 0.05). Surgery with CTx and CRT showed association with superior OS (p < 0.05), and surgery with RT had marginal significance (p=0.078). In multivariate analysis of the R1 resection patients, surgery with CRT showed significant association with OS (p < 0.05). Conclusion Adjuvant RT and CTx may be helpful in improving clinical outcomes of patients with resected EHBDC who have a high risk of disease recurrence, particularly R1 resection patients. Conduct of additional prospective, larger-scale studies will be required in order to confirm the benefit of adjuvant RT and CTx in these patients.

물·시멘트比가 콘크리트 强度에 미치는 影響에 對한 硏究

林正鎬 부천대학 1982 論文集 Vol.2 No.-

연조 슬라이버의 선밀도 거동 해석. I. 스테이플 길이 분포와 슬라이버 점도 효과

임정호,김종성,허유,Lim, Jung Ho,Kim, Jong S.,Huh, You 한국섬유공학회 2017 한국섬유공학회지 Vol.54 No.5

This study deals with the thickness irregularity of the sliver delivered from a drawing process based on a theoretical model. The thickness variation was expressed as CV(%) of the linear density of the drawn sliver in a steady state. Under the given simulation conditions the simulation results illustrate that the sliver linear density shows two types of behavior: a constant linear density and a periodically changing linear density with traveling peaks. For uniform staple-length slivers the linear density has multi-modal fluctuations, whereas the slivers with a distributed staple length show no fluctuation in the linear density at low sliver viscosity. The irregularity of uniform staple-length slivers is higher than that of the staple length distributed one. As the sliver viscosity increases, the irregularity of the drawn slivers increases.

마찰 드럼 상에서의 집속체 꼬임 구조 특성

임정호,간바트,허유,Lim, Jung H.,Ganbat, T.,Huh, You 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.2

Frictional bundling of fibers is accompanied by twists that compel the bundle cohesion force to generate bundle strength. Twists generated by friction occur in two forms; one by fiber arrangement on the bundle layer and the other by torque due to the thickness distribution of the bundle on the friction surface. This study investigates the twists of a friction bundle that occur on the friction surface, and theoretical models of twists are applied to develop total twist and the twist characteristics by simulation. Results showed that the fiber arrangement twists are directionally opposite to the torque twists; fiber arrangement twists occur as S-twists and torque twists as Z-twists. In the steady state the bundle exiting the friction zone had S-twists finally and the twists per length was uniform along the bundle radius. The steady state twists of the bundle at the exit of the friction zone were determined by two model constants and a process variable. The two model constants were composed of model parameters such as slippage ratio, minimum thickness of the fleece for bundling, the density ratio of the bundle to the input fleece, and also of process variables such as friction ratio, the speed ratio of the fleece feeding to bundle takeup, and the thickness of the input fleece. The process variable acting directly on the bundle twist was the fleece feeding width. Thus, the twist angle of the bundle in the friction zone varied with the radial position inside the bundle. The twist angle was the lowest in the vicinity of the bundle axis. As the fiber layer approaches the bundle surface, the twist angle increases.

고로슬래그시멘트를 사용한 콘크리트의 耐凍害性에 관한 硏究

林正鎬 관동대학교 1990 關大論文集 Vol.18 No.1

프랑스의 천일염 생산 및 운영 현황

임정호,Lim, Jeong-Ho 한국식품연구원 2011 食品技術 Vol.24 No.2

高爐 Slag을 利用한 콘크리트의 凍結融解에 의한 耐久性에 對한 硏究

林正鎬 관동대학교 1985 關大論文集 Vol.13 No.3

It's getting more and more difficult to purchase riveraggregates of high-quality, as the-number of concrete projects are increasing tremendously in recent years. Thus, various artificial stones, or blastfurnace slags, instead of river aggregates, should be utilized as a ggregates for those building projects in the coming years. Blastfurnace slags are by-products, which are made in the progess of manufacturing pig-iron, and Korea has an annual production production capacity of blastfurnace-slags amount ing to 3million tons. In our research, we have reviewed the utilization effect of the blastfurnace slags by way of studying its durability and compressibility, in case they were used in concrete projects. As a result of such a research, we have come to a conclusion that the durability of blastfurnace-slage can be improved by adding AE, because that of ordinary slag concrete is relatively poor. In particular, we have also found that the compressibility of slag-concrete which used super-plasticizer turned out to be more than 500㎏/㎠, thus enabling the manufacturing of concrete whose durability is excellent.

R/C 구조물의 비선형 유한요소해석

林正鎬 관동대학교 1993 關大論文集 Vol.21 No.2

鐵筋 콘크리트 구조물의 非彈性 極限 擧動을 컴퓨터를 利用하여 본 연구에서 개발한 有限要素 프로그램으로 硏究하였다. 쉘구조물은 그 표면이 曲形이기 때문에 외력에 우선적으로 부재의 단면에 鉛直방향으로 작용 하는 膜應力(membrane stress)으로 抵抗한다. 현재 이러한 쉘구조물의 設計시 設計荷重에 대한 응력은 彈性은 解析에 의해서 구하고, 補强 鐵筋의 설계는 설계하는 부분의 極限 狀態에(point-wise limit state) 依據하고 있다. 다른 구조물과는 달리 이러한 설계 방법의 일반적인 適用은 實驗 결과의 미비와 어려움 때문에 아직은 쉘구조물에 대해서는 證明되지 못하고 있는 형편이다. 근래에 와서 컴퓨터를 이용하여 數値解析으로 쉘구조물의 極限擧動 해석을 시도하였으나, 컴퓨터 용량의 제한 때문에 많은 연구는 하지 못하고 있었다. 슈퍼 컴퓨터의 出現으로 이제한을 극복하고 더많은 해석을 시도할 수 있게 되었다. 非彈性 有限要素 프로그램에 적용이 가능한 벡터 알고리즘을 슈퍼 컴퓨터에(Cray Y-MP) 開發하였다. 균열 방향이 재하 하중의 상태에 따라 회전할 수 있는 分散龜裂 모델(rotating smeared crack model)을 層狀化(layered)하여 모델이 膜(membrane)과 휨 (bending)의 복합 거동을 사실적으로 표현할 수 있도록 하였다. 개발한 유한요소 프로그램의 성능을 증명하기 위해서, 실제의 쉘구조물의 해석을 시작하기 전에 구조적으로 간단하여 실험데이타를 구할 수 있는 두 구조물의 극한거동을 수치해석 결과와 비교하였다. 비교 결과, 본연구에서 구한 수치해석 결과가 실험치에 매우 가깝게 접근하고 있음을 볼 수 있었다. Nonlinear behavior of reinforced concrete structures is studied using supercomputers by finite element computer program developed in the present study. Shells, because of their curved surface, resist applied forces primarily through in-plane membrane action as opposed to transverse-to-the-plane bending action. In current design practices for such shells, a linear elastic analysis is performed to calculate stresses due to design loads and the design of steel reinforcement is based on the point-wise limit state behavior. Unlike other structures, there is little experimental evidence with reinforced concrete shells that would verify the general applicability of the current design philosophy. In recent years, therefore, an effort has been made to study the behavior of shells numerically with the help of the computer, but the effort to study more problems in greater detail is limited due to the lack of computer resources. With the advent of supercomputers we can study numerically more shell problems in greater detail. An algorithm is developed on a Cray Y-MP supercomputer, which is suitable to implement an inelastic finite element program. A bending inelastic finite element model which incorporates the rotating "smeared" cracking model by layering the subdivided elements is developed that can realistically simulate the coupling behavior between the in-plane and the bending actions. To verify the analysis method of the developed finite element computer porgram we compared the numerical results from the present analysis with the results from the experimental data for two structures, shear panel and slab. By the comparison, the numerical results obtained from the present analyses show that the load-deflection curves are very close to the curves obtained from the experimental data.