In-situ 환원/소결법을 이용한 다공성 니켈 멤브레인 가스필터의 제조 및 평가

김남훈,송한복,최성철,좌용호,Kim, Nam-Hoon,Song, Han-Bok,Choi, Sung-Churl,Choa, Yong-Ho 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.4

Disk type porous nickel membrane was fabricated by in-situ reduction/sintering process using compacted NiO/PMMA (PMMA; Polymethyl methacrylate) mixture at $800^{\circ}C$ in hydrogen atmosphere. The porosity (49$\sim$58%) of these membrane was investigated as an amount of PMMA additive. The thermal decomposition and reduction behavior of NiO/PMMA were analyzed by TG/DTA in hydrogen atmosphere and the activation energy for the hydrogen reduction of NiO and thermal degradation of PMMA was calculated as 61.1 kJ/mol, evaluated by Kissinger method. Finally, the filtering performance and pressure drop were measured by particle counting system.

SM45C와 SCM440의 피삭성 검토에 관한 연구

김남훈,이용성,Kim, Nam-Hoon,Lee, Yung-Sung 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.12

In order to clarify the effects of nonmetallic inclusion contents insteels (SM45C & SCM440) on the tool life, cutting experiment was performed under various cutting conditions. Tool life, cutting force, roughness of machined surface and cutting mechanism are examined on these two kinds of steel. The following conclusions were obtained from the analysis (1) Cutting force of the steels was not affected by chemical component and nonmetallic inclusion. (2) If the rate of amount, Ca/S has a value grater than about 0.2 and addition of less amount of Al, Mn, tool wear of tips decreasesinturning. (3) It is also proved that higher contents of nonmetallic inclusion improve roughness of the surface. (4) Less amount of Ca, higher amount of S, Mn and Al improve the chip breakability.

OGC 기반의 센서 네트워크 서비스 분석 연구

김남훈,함종완,정회경,Kim, Nam-Hoon,Ham, Jong-Wan,Jung, Hoe-Kyung 한국정보통신학회 2010 한국정보통신학회논문지 Vol.14 No.3

USN(Ubiquitous Sensor Network)은 u-city, u-health 등과 같은 영역에서의 다양한 서비스를 통해 유비쿼터스 사회에서 u-life 실현을 가능하게 하는 핵심 인프라이다. 따라서 u-Life의 핵심 기술인 USN 기술에 대한 국내 표준화 확립을 위한 연구가 필요하다. 현재 USN에 대한 표준 현황은 센서 노드 구현을 위한 기술과 센서 노드들 사이의 효율 적인 통신을 위한 프로토콜 및 기존의 망과 연동을 위한 기술 표준 및 연구가 대부분이다. 그러나, 센서 네트워크와 USN 응용을 위한 이기종 센서 네트워크의 통합관리, 센싱 데이터 관리 및 USN 데이터베이스 구조 정의 등과 같은 응용 및 미들웨어 부분에서의 표준 및 연구는 아직 까지 미약한 수준이다. 이에 본 논문에서는 국내 센서 네트워크 서비스의 표준 개발 및 센서 응용 및 미들웨어 부분에서의 표준화된 플랫폼 기술을 위해 OGC(Open Geospatial Consortium)의 SWE(Sensor Web Enablement)를 구성하는 관련 표준 분석과, 국내 TTA(Telecommunications Technology Association)관련 표준과 상호 연관성을 통하여 OGC 표준의 국내 도입 가능성에 대한 연구를 하였다. USN(Ubiquitous Sensor Network) is a core infrastructure that u-life use to enable the realization in the ubiquitous society through various services of area such as u-city, u-Health. Therefore, we need a research for domestic standards to establish USN technique. Currently, status of USN standards is most standard and research that it is a technology for sensor node implementation and a protocol for energy-efficient communication and interlock with existing network. But, Standard and research for sensor network and integration management of heterogeneous sensor networks for USN application and sensing data management and USN database structure definition such as application and middleware is weak level. In this paper, we researched for standard development of domestic a sensor network and the relevant standard analysis to configure SWE(Sensor Web Enablement) of OGC(Open Geospatial Consortium) for standarded plattform technology. Also we researched that it's a connection between domestic ITA(Telecommunications Technology Association) standards and SWE Standard.

유도 결합 플라즈마를 이용한 백금 박막의 건식 식각시 가스 첨가 효과

김남훈,김창일,권광호,장의구,Kim, Nam-Hoon,Kim, Chang-Il,Kwon, Kwang-Ho,Chang, Eui-Goo 대한전기학회 1999 전기학회논문지C Vol.48 No.6

The highest etch rate of Pt film was obtained at 10% $Cl_2$/90% Ar gas mixing ratio in our previous investigation. However, the problems such as the etch residues(fence) remained on the pattern sidewall, low selectivity to oxide as mask and low etch slope were presented. In this paper, the etching by additive $O_2$ gas to 10% $Cl_2$/90% Ar gas base was examined. As a result, the fence-free pattern and higher etch slope as about 60$^{\circ}$was observed and the selectivity to oxide increased to 2.4 without decreasing of the etch rate $1500{\AA}$/min. XPS surface analysis proved that a only little $O_2$ gas removes the Pt-CI compounds as residues on the etched surface.

자기세정을 위한 스퍼터링 TiO₂ 박막의 산소 표면처리에 따른 특성

김남훈,박용섭,Kim, Nam-Hoon,Park, Yong Seob 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.5

Titanium oxide ($TiO_2$) thin films were fabricated by unbalanced magnetron (UBM) sputtering. The fabricated $TiO_2$ films were treated by oxygen plasma under various RF powers. We investigated the characteristics of oxygen plasma treatment on the surface, structural, and physical properties of $TiO_2$ films prepared at various plasma treatment RF powers. UBM sputtered $TiO_2$ films exhibited higher contact angle value, smooth surface, and amorphous structure. However, the rms surface roughness $TiO_2$ films were rough, and the contact angle value was decreased with the increase of the plasma treatment RF power Also, the hardness value of $TiO_2$ film as physical properties was slightly increased with the increase of the plasma treatment RF power. In the results, the performance of $TiO_2$ films for self cleaning critically depended on the with the plasma treatment RF power.

석회화건염(石灰華腱炎)으로 우견관절통증을 호소하는 여환 1례 임상경과 보고

김남훈,장희재,김진환,황덕상,장준복,Kim, Nam-Hoon,Jang, Hee-Jae,Kim, Jin-Hwan,Hwang, Deok-Sang,Jang, Jun-Bock 대한한방체열의학회 2011 대한한방체열의학회지 Vol.9 No.1

Purpose : The purpose of this study is to know the therapeutic effect of herbal-acupuncture on shoulder pain from calcific tendinitis. Methods : The patient who have the calcific tendinitis was treated by herbal-acupunture on 6 acupoints around right shoulder. The shoulder pain and dysfunction was assessed by visual analogue scale(VAS). UCLA Shoulder rating Scale. and SPAI scale. Results : After treatment. all scales showed slightly improvement.. Conclusion : Herbal-acupuncture on shoulder joint was effective in short term study. We need more further study.

마그네트론 스퍼터링법으로 증착시킨 TiC 박막의 물리적, 전기적 특성에서 RF 파워의 영향

김남훈,박용섭,Kim, Nam-Hoon,Park, Yong Seob 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.7

TiC thin films were deposited on Si wafer by unbalanced magnetron sputtering (UBMS) system with two targets of graphite and titanium. During the TiC sputtering, the RF power was varied from 100 W to 175 W and the physical and electrical properties of TiC films were investigated. The hardness and rms surface roughness of TiC films were improved with increasing RF power and the maximum hardness about 24 GPa and the minimum rms surface roughness about 1.2 nm were obtained. The resistivity of TiC films was decreased with increasing RF power. Consequently, the physical and electrical properties of TiC film wewe improved with increasing RF power.

원자층 증착장치에 의한 TiO₂ 박막 코팅된 폴리머 절연체의 표면 및 전기적 특성의 향상

김남훈,박용섭,Kim, Nam-Hoon,Park, Yong Seob 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.7

Titanium oxide ($TiO_2$) thin films were synthesized on polymer insulator and Si substrates by atomic layer deposition (ALD) method. The surface and electrical properties of $TiO_2$ films synthesized at various ALD cycle numbers were investigated. The synthesized $TiO_2$ films exhibited higher contact angle and smooth surface. The contact angle of $TiO_2$ films was increased with the increase of ALD-cycle number. Also, the rms surface roughness of films was slightly rough with the increase of ALD-cycle number. The leakage current on $TiO_2$ film surface synthesized at various conditions were uniformed, and the values were decreased with the increase of ALD-cycle number. In the results, the performance of $TiO_2$ films for self-cleaning critically depended on a number of ALD-cycle.

전악 발치 환자에서 캠퍼그나 트레이를 적용한 즉시의치 수복 증례

김남훈,김종은,오경철,정문규,문홍석,Kim, Nam-Hoon,Kim, Jong-Eun,Oh, Kyung Chul,Chung, Moon-Kyu,Moon, Hong-Seok 대한치과보철학회 2017 대한치과보철학회지 Vol.55 No.3

An immediate complete denture is considered as restoration for lost natural teeth, which is fabricated following the extraction of the remaining teeth. Current esthetics and function can be retained by using immediate denture without edentulous period. However, the major disadvantages of immediate denture relate to the difficulties associated with taking accurate definitive impression and predicting the results of immediate denture. In this case report, the Campagna tray technique was used to take the final impression in a 49-year-old male patient presented with all remaining teeth diagnosed as hopeless teeth. Surgical templates were used for alveoloplasty after extraction. The immediate complete dentures were then delivered. The clinical assessments of immediate dentures showed good esthetic and functional outcomes. The patient showed high level of satisfaction. 잔존 자연치의 발치가 필요한 환자에서 즉시의치의 제작을 고려해 볼 수 있다. 즉시의치를 장착함으로써 환자가 무치악으로 지내는 기간 없이 심미 및 기능을 회복해줄 수 있는 장점이 있지만 인상 채득이 어렵다는 점, 장착 후의 결과를 예측하기 어렵다는 단점이 있다. 본 증례에서는 잔존 자연치를 모두 발치해야 하는 49세 남환에서 캠퍼그나 트레이를 이용하여 최종 인상을 채득하고 수술용 형판을 이용하여 발치 및 치조골 성형술을 시행한 후, 즉시의치를 제작 및 장착하여 심미적, 기능적으로 만족할 만한 치료 결과를 보였기에 이를 보고하고자 한다.

다층 PCB의 두께 예측을 위한 실험식 도출 연구

김남훈,한관희,이민수,김현호,신광복,Kim, Nam-Hoon,Han, Gwan-Hee,Lee, Min-Su,Kim, Hyun-Ho,Shin, Kwang-Bok 한국복합재료학회 2022 Composites research Vol.35 No.3

본 논문은 다층 PCB에 사용되는 프리프레그의 물성을 파악하여 제시한 두께 실험식을 통해 PCB의 두께를 예측하기 위한 연구를 수행하였다. 프리프레그는 물성과 동박 잔존율에 의해서 PCB 제작시 두께가 감소하기 때문에 두께 실험식을 통한 정확한 PCB의 두께 예측이 필요하다. 두께 실험식에 사용되는 프리프레그의 밀도를 파악하기 위해 질량 및 두께를 측정하여 밀도를 도출하였다. 이후 CCL을 제작하기 위해 프리프레그와 동박을 적층하여 핫 프레스기를 사용하였고 광학현미경과 마이크로미터를 사용하여 두께를 측정하였다. 또한 동박 잔존율에 따른 두께 변화를 측정하기 위해 회로밀도를 다르게 구성하여 8층 PCB를 설계하였고 두께 측정 결과와 두께 실험식으로 도출된 두께를 비교하여 두께 실험식을 검증하였다. 비교 결과 CCL의 경우 2.56%, 다층 PCB의 경우 4.48%의 오차를 보였고 이를 통해 두께실험식의 신뢰성을 확인하였다.