수냉쿨러의 냉각 효율 향상을 위한 플레이트 부품의 형상에 관한 연구

성윤호,김형찬,김선민,윤석영,이영웅,이상욱 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2

This study investigates changes in cooling efficiency for heat sink plate width, perforated width, and chamfer angle as part of a parameter study to maximize cooling efficiency of heat sink by setting various variables on plates. The width of the plate is set to 16, 20, 24, 28 mm, perforated width 1.5, 2.0, 2.5 mm, chamfer angles 5, 10, 15 and 20°. By conducting a computational study with Ansys Fluent, the sink plate with plate width of 16mm, perforated width of 3mm and chamfer angle of 10° is shown to be the best cooling efficiency.

生物學的 改良劑를 利用한 슬럿지의 脫水

김형석,신남철,이태호,박승조 동아대학교 환경문제연구소 1991 硏究報告 Vol.14 No.2

To conditioning sludge to occure in the course of food processing industry, after culturing Rhoodotorula glutinis, dosing a certain amount of culture solution into the sludge and measured the variation of total suspended solids and then, in the aerobic and anaerobic conditions after manage sludge, examining the result of measured specific resitance, the coefficient of cmopressibility to know the dewateability. Arrangements of this result are as follows : 1) As the result of total suspended solids concentration by change of aeration time and the amount of Rhodotorula glutinis dose, optimal dose was Rhodotorula glutinis 10㎖ by 20㎖ sludge. The very suitable aeration time was 4-5days. 2) After dosing biological conditioner(Rhodotorula glutinis) 60㎖ by 11 sludge in aerobic condition, aeration for five days. The results of specific resistance, the coefficient of compressibility were 22.71×10^(5)m/㎏ 1.6, respectively. 3) In the cases of using Rhodotoruls glutinis for biological conditioner, using polymer for chemical conditioner. This results are as follows : Biological conditioner ; the moisture content of sludge cake 77.7% Chemical conditioner ; the moisture content of sludge cake 70.3% But, I author propose that biological conditioner is more useful than chemicals in the total operating and maintenance cost.

CaBaLaCu₃Oy의 초전도 특성과 고온 비저항 거동

이호섭,이형철 國立昌原大學校 基礎科學硏究所 1990 基礎科學硏究所論文集 Vol.2 No.-

The superconducting properties of CaBaLaCu₃Oy with Tc = 76K were reported. The X-ray diffraction pattern analysis shows that CaBaLaCu₃0y compound has tetragonal structure at room temperature. The superconductivity of this compound was confirmed from the temperature dependence of electrical resistivity and self-inductance between 300 K and 20 K. We also examined the temperature dependence of the electrical resistivity p(T) in the range of 300 K and 900 K. From the linear behavior of p(T), the strength of electron-phonon coupling constant λ and the electron mean free pathℓ are obtained from the standard electron-phonon dissipation mechanism. Our estimated value of ?????? implies that the superconductivity of CaBaLaCu??0y may not to be interpreted only in terms of the photon-mediated electron-electron interaction.

러시아 한국학 진흥을 위한 전문 교재의 필요성과 개발의 방향 : 언어학과 문학 교재를 중심으로

김형규,장호종 中韓人文科學硏究會 2008 한중인문학연구 Vol.24 No.-

러시아 한국어교육 및 한국학은 학문 내적, 외적인 기반이 취약해 최근 증가 추세에 있는 한국학의 수요를 체계적으로 수용하지 못하고 있어 국내 한국학계와의 긴밀한 상호협조가 절실한 실정이다. 동기와 목적, 그리고 주체를 포함한 전반적인 환경이 달라졌음에도 불구하고 러시아 한국어교육은 취업을 중심으로 한 실용적인 목적에 치중되어 장기적인 차원에서 러시아 한국학의 전문성을 제고하기 어렵다. 따라서 양적으로 증가한 한국어교육 및 한국학 강좌의 많은 부분을 비전문 인력에 의존하고 있는 상황이 반복되고 있으며, 교재 개발이나 교육과정 또한 주로 일회적이고 산발적으로 차원에서 이루어지고 있다. 장기적인 차원에서 러시아 한국학의 전문성을 제고할 수 있는 실질적인 교류 협력 과정을 통해 러시아 한국학의 질적인 전환을 뒷받침하고 이를 통해 러시아 한국학의 내적 기반을 강화하는 데 기여하기 위해 한국학 전문 교재의 개발이 필요하다. 한국학 전문 교재는 회화 습득이라는 초보적, 실용적 목적을 넘어서 의사소통 능력을 고급화하고 한국문화에 대한 이해를 심화시키는 방향으로 발전시킬 수 있어야 하며, 한국문학, 역사, 사회, 경제 등을 전공하는 한국 전문가 양성의 토대를 확대하는데 기여해야 할 것이다. 또한 러시아 한국학의 질적인 전환을 위해서는 체계적이고 장기적인 계획을 바탕으로 한 실질적인 협력 관계를 구축해야 할 필요가 있다. 그리고 이러한 협력 관계는 러시아 한국학 자체의 전문성을 강화하는, 러시아 한국학의 체질을 개선하여 연구 및 교육 시스템을 안정적으로 구축하는 방향으로 이루어져야 한다. 이를 위하여 러시아 현지의 문화적 특성 및 교육환경을 반영할 수 있도록 러시아와 한국 학자 및 교육기관과의 실질적인 협력 시스템을 구축하여 한국학의 전문적 지식을 체계적으로 구성하는 것이 시급하다. Enhancing academic foundation of Koreanology overseas as well as meeting various demands of Korean language education require organic cooperation with Koreanology field in Korea. Specific situations in each region and accomplishments by each sector should be harmoniously communicated for stable and long-term development of Koreanology overseas and ultimately for promoting recognition of Koreanology throughout the world. Attention and effort from domestic Koreanology field are much needed considering demand of Koreanology and Korean language are increasing among countries with relatively weak academic foundation. Russia also has weak academic foundation on which demand of Koreanology is not systematically managed; therefore close mutual cooperation with Koreanology field in Korea is needed. Koreanology in Russia focuses more on practical purposes in which Korean language education is for job opportunities, despite the change in overall environment including objects, goals and core of Koreanology; therefore it is hard to consider specificity of Koreanology in Russia from long-term perspective. This situation led to growing dependency on non-professionals for major part of increasing Korean language education courses and Koreanology classes and majority of teaching material developments and education processes are not continuous and consistent but sporadic. In long-term perspective, development of specialized teaching materials for Koreanology is needed to enhance the internal foundation of Koreanology in Russia through practical cooperation process and change in quality of Koreanology for specificity of Koreanology in Russia. Specialized teaching materials for Koreanology should help with more sophisticated communication skills beyond beginner level communication skill and practical purposes; promote further understanding on Korean culture; and contribute to expanding foundation to train experts of Korea in Korean literature, history, society and economy. In addition, practical cooperation based on systematic long-term plan is needed to change the quality of Koreanology in Russia. Such cooperative relationship should be able to enhance specificity of Koreanology in Russia, improve the quality of Koreanology and establish stable research and education system within Russia. Practical cooperative system among scholars and educational organizations in Russia and Korea should be established to systematically organize specialized knowledge of Koreanology.

유한요소계산을 이용한 Airline 방향성 결합기 설계 파라미터 추출

윤재호,김형석 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1

In this paper, we extracted design parameters of airline directional coupler by finite element analyis. By employing the capacitance obtained by FE analysis, design parameters for each lines are extracted. Using the proposed method, the airline directional coupler has been designed and fabricated for measurement. We obtained the desired coupling value and the high directivity of 40dB. The measurement results show the validity of this design method.

초고속 국가망의 가입자망 유형별 정보보호 대응방안

이형옥,조정호,한치문 한국정보사회진흥원 2003 정보화정책 Vol.10 No.1

본 논문에서는 초고속국가망의 가입자별 망구조와 초고속 국가망을 이용하는 기능에 따른 가입자망의 유형을 분석하고, 이를 토대로 초고속국가망에서 가입자망의 정보보호를 위한 보안모델을 제시한다. 이를 위해 가입자망 구조를 FR망 가입자, ATM망 가입자 및 라우터망 가입자로 구분하고, 가입자망의 기능을 인터넷 백본 모델, ATM종단간 전용선 기능인 가상 터널링 모델, VPN모델로 분류한 다음, 각 모델별 가입자 정보보안을 위한 대응 방안을 분석한다. In this paper, subscriber network types in KII(Korea Infornation Infrastructure) accofding to subscriber network structures and the application types of subscriber are analyzed, and the protction models for the user data of subscriber networks on KII are proposed. The subscriber network structures such as FR(Frame Relay) network, ATM network and router network are defined, and the service application model in KII are classified. As a results, user data protection methods suitable for each model are analyzed.

온-라인 컴퓨터제어에 의한 메탄올로부터 균체의 생산

이형춘,이계호 서울保健大學 1989 論文集 Vol.9 No.1

초음파 기구에 의한 치근단 와동형성후 역충전의 밀폐성에 대한 연구

이형일,손호현 大韓齒科保存學會 1993 Restorative Dentistry & Endodontics Vol.18 No.1

AbstractThis study was conducted to evaluate and compare the apical leakage in the following retrofil- ling techniques after apical resection ; No apical cavity preparation and no retrofilling(control group), Amalgam(group I) or silver glass ionomer cement(group II) retrofilling after apical cavity preparation with mini contra-angle and bur, Amalgam(group III) or silver glass ionomer cement(group IV) retrofilling after apical cavity preparation with ultrasonic micro endo tip.Extracted ninety upper anterior and lower canine teeth were fixed in skull simulators and root canals were prepared with step-back method and obturated with gutta-percha and zinc oxide eugenol sealer. Obturated roots were resected 2mm from apical ends and apical cavities of 1mm width and 2mm depth were prepared and retrofilled by above mentioned methods.After application of nail varnish on all surface except resected surface, apical 1/3 of the roots were placed in 1% methylene blue solution for 3 days. After longutudinal sectioning to expose central parts of filled materials, depths of penetrated dye were measured by measu- ring microscope and were analyzed statistically.The results were as follows. 1. Having no relation with instruments used in apical cavity preparation, amalgam retrofilling groups(group I and II) showed less apical leakage which was not significant statistically than no retrofilling group(control group) (P<0.05), but silver glass ionomer cement retrofi- lling gruoups(group II and W) showed significantly less apical leakage than no retrofilling group(control group) (P<0. Ol). 2. In the groups retrofilled with the same material, the apical leakage in cavities prepared with ultrasonic micro endo tip(group III and IV) was less than that in cavities prepared with mini contra-angle and bur(group I and II), but not significant statistically (P>0.05). 3. When apical cavities were prepared with same instrument, the egroups retrofilled with silver glass ionomer cement(group II and IV) showed significantly less apical leakage than the groups retrofilled with amalgam (group I and III.).

경피전기신경자극의 동통억제효과에 대한 실험적 연구

송형근,이상호,계기성,유종만 大韓小兒齒科學會 1995 大韓小兒齒科學會誌 Vol.22 No.1

The purpose of this study was to investigate the effect of electrical anesthesia induced by transcutaneous electrical nerve stimulation on inhibition of the pain response evoked by noxious electrical stimuli in teeth and gingiva. The experiment was carried out on anesthetized dogs. Left digastric muscle was exposed and wire electrodes were inserted into the muscles to record E.M.G.. Bipolar stimulating electrodes were inserted into the tooth of canine and the palatal area of gingiva. Noxious electrical stimuli were delivered to the tooth and the gingiva by electric stimulator(GrassTM, USA) under electronic anesthesia induced by transcutaneous electrical nerve stimulation device with frequency of 50㎐. The E.M.G. of jaw opening reflex at digastric muscle was measured by the osciloscope and the audiometer connected to amplifier(A-M system, 1700, USA) at different intensity of electronic anesthesia of 1 volt, 4 volt, and 10 volt. The pain threshold and the inhibitory rate of pain via E.M.G. of digastric muscle were analysed statistically with paired t-test adn χ2-test. The obtained results were as follows ; 1. Transcutaneous electrical nerve stimulation with intensity of 1 volt and 4 volt increased the pain threshold 9.4% and 18.6% in teeth and 14.3% and 32.1% in gingiva respectively, but that of 10 volt did not change or reduce the pain threshold. 2. Transcutaneous electrical nerve stimulation with intensity of 1 volt, 4 volt, and 10 volt showed the inhibitory effect of pain of 10.5%, 15.0% and 4.6% in teeth, and 18.2%, 23.4%, and 19.3% in gingiva respectively when noxious electrical stimulation was inserted 1.5 times higher than the pain threshold. Transcutaneous electrical nerve stimulation with intensity of 10 volt did not show inhibitory effect of the pain response as that of 1 volt and 4 volt. 3. The pain threshold in gingiva was increased higher by transcutaneous electrical nerve stimulation than it was in teeth, and the inhibitory effect of the pain in gingiva was also increased higher than it was in teeth. In regard to above results, inhibitory effects of pain induced by transcutaneous electrical nerve stimulation was not so high as to replace the role of drug anesthesia wholly. The technique of reducing pain induced by transcutaneous electrical nerve stimulation itself, was needed to develop to have better anesthetic or analgesic effect and less discomfort during anesthetic procedure.

불면증환자에서 장내정상세균총의 수와 수면시간간의 상호변화에 대한 연구

이영호, 김형일 忠北大學校部設基礎科學硏究所 1987 自然科學硏究 Vol.1 No.1

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