지하철 배열이용 가능량에 관한 연구

김종열,김보철,김경철,최광환,금종수 동의공업대학 1998 論文集 Vol.24 No.1

Research on unused energy continues due to the limits of fossil fuel and the destruction of the environment. Therefore this study was performed as follows. The collectable amount of exhausted heat for an air-conditioning was calculated by the subway thermal environment prediction program. And the electric power needed by conventional heat source equipment was compared with one by unused heat source equipment when the exhausted heat was used by heat pump in heating and hot water supply. The results are summarized as follows 1. Forced ventilation should be conducted to keep optimal temperature in the subway tunnel in summer as well as in winter. According to the simulation, the temperature in tunnel was higher than that on the ground in summer when the forced ventilation was conducted only in the winter. 2. Ventilating time should be calculated out to the optimal condition for not only the saving power of the ventilation fan but reusing exhausted heat. By the simulation, it is certain that the exhausted heat should be eliminated in air-conditioning time. 3. The use of the exhausted heat source heat pump could save 8% of electric power per hour in comparison with existing heat pump. This was based on a present heat generation and traffic for ventilating time of general air-conditioning, but could be different by ventilating time. 4. As the traffic increases up to 1.5 or 2 times, electric power consumption of the conventional heat pump increases to 11% or 13.5% per mean hour in comparison with that of the exhausted heat source heat pump, though all-day ventilation.

태양열 이용 냉난방 공조시스템 중 재생기의 하계 재생 능력에 관한 연구

김보철,최광환,금종수,김경철,김종렬 동의공업대학 1998 論文集 Vol.24 No.1

The humidity control is conducted not only for industrial applications but also for domestic ones. High humidity is a factor causing discomfort, thus the importance of using a LiCl(Lithium Chloride) solution has been recognized in recent years in connection with the high quality of goods to be manufactured. as well as cleanliness in a special environment against air pollution and environmental protection. This paper will examine the solar energy regenerator as a part of an open cycle solar energy absorption system for dehumidifying and drying purposes using LiCl solution. An outdoor experiment was done to find out how much could be regenerated in summer. It was found that regeneration rate was about 10kg/day at best in August, and about 5kg/day in September.

하악 고정성 임프란트를 이용한 퇴축된 하악골의 수복

정영진,박원희,안원준,이명렬,이영수,유광희,심광섭 한양대학교 의과대학 1997 한양의대 학술지 Vol.17 No.2

Transmandibular implants are used limitedly such as on remaining symphyseal basal bone of atrophic mandible, on the bony defect of symphyseal area due to trauma or tumor as surgical implants. Among the more recent advances in oral implantology are the Fixed Mandibular Implant (FMI)based on the pioneering studies and clinical applications by Irwin Small of the USA and the development very high success rates for providing attachments and abutments in areas of the oral cavity severely compromised by either atrophy or surgical loss of osseous tissues. We will present a case report of regabilitation of totally edentulous mandible with advanced alveolar atrophy using Fixed Mandibular implant (F.M.I).

생활하수슬러지가 토양 화학성 및 장미의 생육에 미치는 영향

최정,이동훈,박만,최충렬,김광섭 한국환경농학회 2002 한국환경농학회지 Vol.21 No.2

생활하수슬러지를 장미 재배지에 토양 개량제로서 시용량을 달리하여 첨가하고 장미의 생육상, 토양 및 식물체중 중금속의 함량에 미치는 영향을 조사하였다. 장미 재배지에 하수슬러지를 사용하면 시용량이 증가함에 따라 신장과 비대생장이 증가했으며 주당 꽃송이도 많아 생육이 양호한 것으로 나타났다. 토양 중 중금속 함량은 시용량의 증가에 따라 일정한 경향은 없었으며 식물체에 의한 대부분의 무기성부 흡수량은 하수 슬러지의 시용량에 따라 증가하는 것으로 나타났다. 결과적으로 생활 하수 슬러지는 유해물질의 농도가 낮으면 경작지에 처리하여도 무관할 것으로 판단된다. This study was conducted to find out the effect of municipal sewage sludge on the growth and heavy metal content of rose and soil chemical properties. Municipal sewage sludge was applied to soil at rate of 0, 3, 5, 10 and 15 ton/10a, the plant height, flower number and stem size of rose were found to be increase in the treatments of sewage sludge. Contents of mineral nutrients in rose stem were determined to be higher at municipal sewage sludge application plots than those of no application. But, there were not any significant increases of heavy metal contents in soil and rose stem with the sludge applications. From the results of this study, it is apparent that the application of municipal sewage sludge would not increase available heavy metals in soil.

생체모사환경에서 DLC 필름의 부식마모 특성에 미치는 Si 함량의 영향에 관한 연구

김호건,김우중,김정구,박세준,이광렬 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.3

In a method to improve resistance to wear, corrosion and mechanical properties of protective coating, DLC coatings have been extensively studied over the past several years due to their unique combination of properties. Especially, Si-DLC coatings have been attracting increasing interest of researchers since they have a great potential for solving some of the major disadvantages of pure DLC coatings. Si-incorporated diamond-like carbon (Si-DLC) coatings ranging from 0 to 2 at.% were deposited on Ti alloy substrate by means of r.f. plasma-assisted chemical vapor deposition (r.f. PACVD) technique, using mixtures of benzene (C_(6)H_(6)) and silane (SiH_(4)) as the reaction gases. Corrosion and wear behavior of DLC coatings was investigated by electrochemical techniques (potentiodynamic polarization test and electrochemical impedance spectroscopy), tribological techchnique(wear test) and surface analyses (atomic force microscopy, scanning electron microscopy and Raman spectroscopy). It was found that DLC coatings with increasing Si content could acquire improved corrosion and wear resistance in the simulated body fluid environment (0.89 wt.% NaCl of pH 7.4 at 37℃). (Received December 6, 2004)

인공고관절용 스테인리스강 316L에 증착된 다이아몬드상 카본 필름의 전기화학적 특성에 관한 연구

김호건,안승호,김정구,박세준,이광렬 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4

Diamond-like carbon (DLC) films have several advantages in applications such as high hardness, chemical inertness, low friction and electrical insulation. Furthermore, DLC-coated STS 316L films have been reported to have a good biocompatibility, such as the absence of inflammatory response. Thus, corrosion resistance is the first consideration for the biomaterials to be used in the body. DLC films have been deposited onto substrates of STB 316L for artificial hip joints using r.f PACVD (plasma-assisted chemical vapor deposition) with C_(6)H_(6) and mixture of C_(6)H_(6) and SiH_(4) as the process gases. Three kinds of DLC-coated films were prepared as a function of diverse bias voltage and Si incorporation. Corrosion behavior of DLC films was investigated by electrochemical techniques (potentiodynamic polarization test and electrochemical impedance spectroscopy) and surface analyses (atomic force microscopy and scanning electron microscopy). The electrolyte used in his test was a 0.89%NaCl solution of pH 7.4 at temperature 37℃. Electrochemical measurements showed that DLC films with higher bias voltage and Si incorporation could improve corrosion resistance in the simulated body fluid environment. (Received December 5, 2003)

Real-Time “Eye-Writing” Recognition Using Electrooculogram

Kwang-Ryeol Lee,Won-Du Chang,Sungkean Kim,Chang-Hwan Im IEEE 2017 IEEE transactions on neural systems and rehabilita Vol.25 No.1

<P>Eye movements can be used as alternative inputs for human-computer interface (HCI) systems such as virtual or augmented reality systems as well as new communication ways for patients with locked-in syndrome. In this study, we developed a real-time electrooculogram (EOG)-based eye-writing recognition system, with which users can write predefined symbolic patterns with their volitional eye movements. For the “eye-writing” recognition, the proposed system first reconstructs the eye-written traces from EOG waveforms in real-time; then, the system recognizes the intended symbolic inputs with a reliable recognition rate by matching the input traces with the trained eye-written traces of diverse input patterns. Experiments with 20 participants showed an average recognition rate of 87.38% (F1 score) for 29 different symbolic patterns (26 lower case alphabet characters and three functional input patterns representing Space, Backspace, and Enter keys), demonstrating the promise of our EOG-based eye-writing recognition system in practical scenarios.</P>

Basal Cell Carcinoma Presenting as a Hypertrophic Scar

Kwang-Ryeol Lim,조가형,So-Min Hwang,Yong-Hui Jung,Jennifer Kim Song 대한성형외과학회 2013 Archives of Plastic Surgery Vol.40 No.3

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Aberrant CpG Islands Hypermethylation Profiles in Malignant Gliomas

Kwang Ryeol Kim,Ealmaan Kim,Eun-Ik Son 대한뇌종양학회 2014 Brain Tumor Research and Treatment Vol.2 No.1

Background The authors analyzed whether the promoter hypermethylation of cancer-related genes was involved in the tumorigenesis of malignant gliomas. Methods A total of 29 patients received surgery and histologically confirmed to have malignant gliomas from January 2000 to December 2006. The promoter methylation status of several genes, which were reported to be frequently methylated in malignant gliomas, was investigated using methylation-specific polymerase chain reaction. Results All cases of malignant gliomas represented the promoter hypermethylation in at least 2 or more genes tested. Of 29 tumors, 28 (96.55%) showed concurrent hypermethylation of 3 or more genes. Ras association domain family member 1, epithelial cadherin, O-6 methyl guanine DNA methyltransferase, thrombospondin 1, p14 and adenomatous polyposis coli were frequently methylated in high grade gliomas including glioblastomas, anaplastic astrocytomas, and anaplastic oligodendrogliomas. Conclusion Aberrant hypermethylation profile was closely related with malignant gliomas suggesting that epigenetic change may play a role in the development of malignant gliomas. Two or three target genes may provide useful clues to the development of the useful prognostic as well as diagnostic assays for malignant gliomas.

Find a Way on the Road

Kwang-ryeol, Choi(최광열) 신학과 실천학회 2022 신학과 복음 Vol.12 No.-