촉매 및 반응공학 Poster 발표 : 그물 구조상 수지촉매에 의한 가솔린 옥탄가 향상제인 ETBE ( Ethyl tert - Butyl Ether ) 합성

이진형,조형규,박진화,김재승 ( Jin Hyung Lee,Hyung Gyu Cho,Jin Hwa Park,Jae Seung Kim ) 한국화학공학회 1993 추계학술발표회 Vol.- No.-

고로슬래그 골재를 사용한 다공성 콘크리트의 물리·역학적 특성에 미치는 고로슬래그 미분말, 황토 및 보강섬유의 효과

이진형,박찬기,Lee, Jin-Hyung,Park, Chan-Gi 한국농공학회 2010 한국농공학회논문집 Vol.52 No.5

The effects of blast furnace slag, hwang-toh, and reinforcing fiber on the physical and mechanical properties of porous concrete using blast furnace slag coarse aggregates have been evaluated in this study. The effect of the depending on replacement ratio of blast furnace slag to cement was investigated such that the replacement ratio was varied to 0 %, 25 % and 50 %. Also, the replacement ratios of hwang-toh were 0, 20 and 30 %. The polyvinyl alcohol fiber was used for the reinforcing fiber. A series of pH, unit mass, and void ratio tests have been performed to study the physical properties of the porous concrete using blast furnace slag coarse aggregates with the polyvinyl alcohol fiber and the replacement ratios of blast furnace slag, hwang-toh, while a series of compressive tests have been performed to evaluate the strength property depending on polyvinyl alcohol fiber and the replacement ratios of blast furnace slag, hwang-toh. The test results indicated that the physical and mechanical properties of porous concrete using blast furnace slag coarse aggregates is affected by the replacement ratio of blast furnace slag, and the fiber contents. According to the tests with polyvinyl alcohol fiber contents, the void ratio was decreased and the compressive strength was upgraded.

복부 임파관종

이진형,최순옥,박우현,Lee, Jin-Hyung,Choi, Soon-Ok,Park, Woo-Hyun 대한소아외과학회 2006 소아외과 Vol.12 No.2

Abdominal cystic lymphangiomas arising from the mesentery, omentum and retroperitoneum are rare and occasionally confused with other cause of acute abdomen. Sixteen children who underwent surgery for abdominal cystic lymphangioma between 1984 and 2005 at the Division of Pediatric Surgery, Keimyung University Dongsan Medical Center were evaluated retrospectively. There were 9 boys and 7 girls. Age ranged from 12 days to 13 years (mean age: 4.7years). The cysts were located in the omentum (4 cases),mesentery (9 cases: jejunum: 3, colon: 6). retroperitoneum (2 cases) and pelvic cavity (one case). The cyst content was hemorrhagic (8 cases), serous (5 cases), and inflammatory (2 cases), and chyle (one). Prenatal diagnosis was made in 3. The clinical features were variable, but abdominal pain, mass, and abdominal distention in order. There were 3 emergency operations in patients with complicated cyst, who were suspected of having panperitonitis and volvulus preoperatively. Complete excision was accomplished in all cases. There was one mortalityin a newborn with E.coli sepsis. Intestinal obstruction developed in 2 cases in long-term follow-up. No recurrence was observed. Although intraabdominal lymphangioma arising from mesentery, omentum and retroperitoneum are rare, it should be considered as a possible cause of acute abdomen.

Improvement of fermentable sugar production using planetary mill pretreatment

Jin Hyung Lee(이진형),Jeong Heo Kwon(권정회),Jae-Won Lee(이재원),Robert J. Mitchell 한국신재생에너지학회 2016 한국신재생에너지학회 학술대회논문집 Vol.2016 No.5

형상기억합금 호선의 역학적 해석

이진형(Jin-Hyung Lee),남동석(Dong-Seok Nahm) 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.3

This study was designed to investigate the displacements and reaction forces of teeth caused by the application of the rectangular shape-memory arch wires with curve of Spee. Computer-aided three dimensional finite element method was adopted. This finite element model consists of brick element for teeth. beam element for the wire, and contact element for the periodontal ligament. And the applicaton of the MEAW(Multiloop Edgewise Arch Wire) was also studied so that the results of the two methods can be compared each other. Total number of the nodes and elements were found to be 5925 and 4031, repectively. In addition, several types of elastics and corresponding displacements and reaction forces were examined. The findings of this study were as follows: 1. When the rectangular shape-memory arch wire with curve of Spee was used alone, the intrusion and labioversion was noticeable on the upper incisors, while the upper molars showed less intrusion. With MEAW, the intrusion and labioversion of the upper incisors were slightly larger than those when the shape-memory arch wire was used, but on the upper molars the opposite result was obtained with respect to the intrusion. 2. The shape-memory arch wire with the vertical elastics caused the larger downward displacement on the upper canine than that when the MEAW was used with the vertical elastics. However, the downward displacement of the upper incisors was larger in MEAW. The uprighting and buccoversion of the molars were observed in both cases. 3. The use of the Class II or III elastics showed the extrusion and changes in torque of the corresponding teeth. The downward displacement of the upper canine was increased when the Class II and vertical elastics were applied simultaneously, but it was decreased when both of the Class III and vertical elastics were used.

천장형 에어컨 토출각 변화가 실내 열쾌적성에 미치는 영향

이진형(Jin-Hyung Lee),김유재(You-Jae Kim),박성관(Sung-Kwan Park),이종철(Jong-Chul Lee),김윤제(Youn-Jea Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-

This paper considered the effect of discharge angles of 4-way cassette A/C on the indoor thermal comfort in high ceiling environment. The heat transfer from outdoor is considered through the window, the entrance door, ceiling, floor, and walls. The numerical study is performed with the height of the room in which is 3.6 m higher than the height of common building (2.7m). Using a commercial code, FLUENT, the numerical study is performed with incompressible, unsteady, three-dimensional and turbulence conditions. The indoor thermal comfort is analyzed with various discharge angles, β=45°, 50°, 55° and 60°. The thermal comfort is evaluated by EDT (effective draft temperature) and ADPI (air diffusion performance index) at ASHRAE Standard.

고지방식이로 유도한 비만마우스에서 berberine과 silibinin 복합투여를 통한 지질대사 개선과 항비만 효능 증진

이진형 ( Jin Hyung Lee ),최영훈 ( Young Hoon Choi ),윤영걸 ( Young Geol Yoon ) 한국응용생명화학회 2021 Journal of Applied Biological Chemistry (J. Appl. Vol.64 No.3

본 연구에서는 고지방식이(HFD)를 급식하여 제조한 비만마우스 모델을 사용하여 berberine (BBR)과 silibinin (SBN) 복합투여가 혈중 지질대사 및 항비만 개선 효능에 유의적인 시너지 효과가 있는지 조사하였다. HFD로 유도된 비만마우스를 8 주 동안 HFD의 지속적인 제공와 함께 BBR 및 SBN (BBR-SBN) 조합을 투여하였다. 실험이 진행되는 동안 체중과 식이량을 측정하였고 혈중 총 콜레스테롤, 중성지방 및 HDL 콜레스테롤 수준을 분석하였다. HFD를 제공한 마우스는 정상 대조군(NC) 그룹에 비해 체중과 총 콜레스테롤 및 중성지방 수치가 급격히 증가했다. 그러나 이러한 비만마우스에 BBR-SBN조합을 투여 하였을 때 체중 증가가 현저하게 감소하였고 HDL 콜레스테롤 수치가 증가하였으며 총 콜레스테롤 및 중성지방 수치는 유의하게 억제되었다. HFD그룹의 복부지방 무게는 유의하게 증가했으며 부고환 지방조직 내의 지방세포의 크기가 NC 그룹에 비해 크게 확장된 것으로 나타났다. 그러나 BBR-SBN 그룹에서는 지방세포의 크기가 NC 그룹의 크기와 비슷했으며 복부지방 무게가 현저하게 감소하였다. 더불어, HFD 그룹에서 보이는 간 조직의 거대 소포성 지방구의 축적은 BBR-SBN 그룹에서 크게 감소되었다. 이러한 결과는 BBR-SBN 조합이 HFD 유발 비만마우스에서 체중 및 복부 지방 증가를 현저하게 감소시키는 경향이 있으며 혈청 내의 총 콜레스테롤 및 중성지방 수준을 낮추어 항비만 효능을 개선시킬 수 있는 가능성을 보여주는 것으로 앞으로 항비만 치료 및 개선제제로서의 잠재력을 가지고 있음을 시사한다. In this study, we investigated whether the combined administration of berberine (BBR) and silibinin (SBN) was effective in improving hyperlipidemia and anti-obesity efficacy using a high-fat diet (HFD)-fed obese mouse model. HFD-induced obese mice were supplemented with the BBR and SBN combination (BBR-SBN) along with the HFD administration for 8 weeks. During the experiment, body weight, food intake, and levels of total cholesterol, triglyceride and high-density lipoprotein (HDL)-cholesterol were analyzed. Consumption of HFD in the mice caused rapid increases in body weight and the levels of total cholesterol and triglycerides compared to the normal control (NC) group. However, supplementation of BBR-SBN in these obese mice significantly reduced body weight gain and suppressed the levels of total cholesterol and triglyceride with the increment of HDL cholesterol level. In the HFD-fed group, abdominal fat weight was significantly increased and the adipocytes within the epididymal adipose tissue were found to have expanded sizes compared to the NC group. However, in the BBR-SBN group, the sizes of the adipocytes were comparable to those of the NC group and abdominal fat weight was significantly reduced. Moreover, the deposition of giant vesicular fat cells in liver tissues seen in the HFD-fed group was considerably reduced in the BBR-SBN group. These results suggest that the BBR-SBN combination tends to have synergic potential as an anti-obesity agent by significantly reducing body weight gain as well as lowering serum lipid levels and thus improving anti-obesity efficacy in HFD-induced obese mice.

라이프 로그 공유 및 관리를 위한 확률모델 기반 사용자 인터페이스 및 블로그 개발

이진형(Jin-Hyung Lee),노현용(Hyun-Yong Noh),오세원(Se-Won Oh),황금성(Keum-Sung Hwang),조성배(Sung-Bae Cho) 한국정보과학회 2009 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.5

모바일 장치에서 수집되는 로그 데이터는 개인의 일상에 대한 다양하고 지속적인 정보를 담고 있다. 이로부터 얻을 수 있는 사용자의 위치, 사진, 사용중인 모바일 장치 기능 및 서비스의 종류를 통하여 사용자의 상태를 추론하고 개인의 일상을 이해하는 연구가 많은 관심을 받고 있다. 본 논문에서는 모바일 장치로부터 실시간으로 로그 데이터를 수집, 분석하고 이를 지도기반으로 시각화하여 개인 일상에 대한 정보를 효과적으로 관리할 수 있도록 하며 다른 사용자와 이 정보를 공유하여 상호 사용 가능한 어플리케이션을 개발한다. 제안하는 어플리케이션은 베이지안 네트워크 확률 모델을 채택하여 개인의 상황을 추론한다. 실험에서는 실제로 수집된 로그 정보를 바탕으로 효율적 시각화 및 다른 사용자와의 정보 공유 기능의 유용성을 확인하였다. The log data collected on a mobile device contain diverse and continuous information about the user. From the log data, the location, pictures, running functions and services of the user can be obtained. It has interested in the research inferring the contexts and understanding the everyday-life of mobile users. In this paper, we have studied the methods for real-time collection of log data from mobile devices, analysis of the data, map based visualization and effective management of the personal everyday-life information. We have developed an application for sharing the contexts. The proposed application infers the personal contexts with Bayesian network probabilistic model. In the experiments, we confirm that the usability of visualization and information sharing functions based on the real world log data.

목질계 바이오매스 전처리 방법에 따른 발효당의 성분 및 생물학적 부틸산 생산 영향 연구

이진형(Jin Hyung Lee),전병승(Byoung Seong Jeon),구양모(Yang Mo Gu),원종인(Jog In Won),박효정(Hyo Jeong Park) 한국신재생에너지학회 2023 한국신재생에너지학회 학술대회논문집 Vol.2023 No.6

경제 불황에서 텍사스 병원의 고정 자산 투자 변화

이진형(Lee, Jin-Hyung),곽원준(Kwak, Won-Jun) 글로벌경영학회 2014 글로벌경영학회지 Vol.11 No.3

최근 경제 불황은 미국 경제에 커다란 영향을 미쳤다. 하지만, 이러한 경제 불황이 병원의 자산 투자에 어떤 영향을 미쳤는지는 연구가 되지 않았다. 따라서, 이 연구는 병원 고정 자산의 구조를 경제 불황의 전, 후로 비교 분석 하고자 한다. 이 연구는 2006부터 2010까지 5년간의 미국 텍사스 병원 데이터를 사용했다. 이 연구는 2008년의 미국 경제 불황에도 불구하고, 병원들은 고정 자산 투자를 늘린 것을 발견했고, 영리 병원과 비영리 병원간에 고정 자산의 투자 변화가 다르다는 것도 발견했다. 예를 들면, 비영리 병원은 경제 불황에도 불구하고 고정 자산을 늘린 반면, 영리 병원은 고정 자산 투자에 변화가 없었다. The recent financial crises affected the US economy. However, how this financial crisis affected the asset investment trend in hospitals has not draw much attention from researchers. This study describes and analyzes the fixed asset investment structure across hospital ownership two years before and after a financial crisis using Texas hospitals data from 2006 to 2010. The finding shows that Hospitals increased fixed asset investment after financial depression in 2008. Also, we found that hospitals’ asset investment differs significantly by hospital ownership. Not-for-profit and government hospitals increased fixed assets after the financial crisis, while for-profit hospitals did not change their asset investment plan responding to financial crisis.