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IPS-Empress 도재관의 변연형태에 따른 파절강도에 관한 연구
김현수,주태훈,오상천,동진근,Kim, Hyun-Soo,Ju, Tae-Hun,Oh, Sang-Chun,Dong, Jin-Keun 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.2
The purpose of this study was to compare the fracture strength of the IPS-Empress ceramic crown according to margin types such as bevel, shoulder, rounded shoulder, shoulder with bevel, rounded shoulder with bevel and bevel with groove. After 10 metal dies were constructed for each group, the IPS-Empress ceramic crown were fabricated and each crown was cemented on each metal die with Bistite resin cement. The cemented crowns mounted in the testing jig were inclined 30 degree and universal testing machine (Zwick 1456 41, Zwick Co., Germany) was used to measure the fracture strength. The obtained results were as follows : 1. The fracture strength of the crown with rounded shoulder was the highest of all. The mean fracture strength was 484N in rounded shoulder, 357N in bevel, 341N in rounded shoulder with bevl, 300N in shoulder with bevel, 280N in shoulder and 275N in bevel with groove. 2. The fracture strength of rounded shoulder was statistically different from those of shoulder with bevel, shoulder and beve41 with groove. 3. In the strain at fracture, there was no significant difference among each group. 4. The fracture mode of the crown was similar and most of fracture line began at the loading area and extended through proximal surface perpendicularly to the margin, irrespective of margin type.
MOS-FET 구조의 MWCNT 가스센서를 이용한 초희박 NOx 가스 검출 특성
김현수,이승훈,장경욱,Kim, Hyun-Soo,Lee, Seung-Hun,Jang, Kyung-Uk 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.9
Carbon nanotubes(CNT) has strength and chemical stability, greatly conductivity characteristics. In particular, MWCNT (multi-walled carbon nanotubes) show rapidly resistance sensitive for changes in the ambient gas, and therefore they are ideal materials to gas sensor. So, we fabricated NOx gas sensors structured MOS-FET using MWCNT (multi-walled carbon nanotubes) material. We investigate the change resistance of NOx gas sensors based on MOS-FET with ultra lean NOx gas concentrations absorption. And NOx gas sensors show sensitivity on the change of gate-source voltage ($V_{gs}=0[V]$ or $V_{gs}=3.5[V]$). The gas sensors show the increase of sensitivity with increasing the temperature (largest value at $40^{\circ}C$). On the other hand, the sensitivity of sensors decreased with increasing of NOx gas concentration. In addition, We obtained the adsorption energy($U_a$), $U_a$ = 0.06714[eV] at the NOx gas concentration of 8[ppm], $U_a$ = 0.06769[eV] at 16[ppm], $U_a$ = 0.06847[eV] at 24[ppm] and $U_a$ = 0.06842[eV] at 32[ppm], of NOx gas molecules concentration on the MWCNT gas sensors surface with using the Arrhenius plots. As a result, the saturation phenomena is occurred by NOx gas injection of concentration for 32[ppm].
말초신경병증이 초기 증상으로 나타난 전신성 경화증 1례
김현수 ( Hyun Soo Kim ),이상길 ( Sang Gil Lee ),서정훈 ( Jeong Hun Seo ),이지수 ( Ji Soo Lee ),이수곤 ( Soo Kon Lee ),김태승 ( Tai Seung Kim ) 대한류마티스학회 1998 대한류마티스학회지 Vol.5 No.2
Systemic sclerosis (SSc) is a chronic inflammatory disease of the connective tissue with involvement of the skin and other organs. The disease is characterized by an abnormal accumulation of collagen in all tissues and by microangiopathy. Unlike other collagen disorders, neurologic manifestations in SSc are considered uncommon, ocurring in only 0.8% to 5.6% of patients and consisting mainly of muscle changes and peripheral neuropathy. In this report, we describe a 47-year-old woman whose disease manifested as Raynaud`s phenomenon and peripheral neuropathy, and diagnosed as SSc later by typical skin changes. This case illustrates an unusual initial manifestation of SSc.
점막연관 림프조직형 위 림프종과 병발한 조기 위암 1 예
김현수(Hyun Soo Kim),백순구(Soon Koo Baik),이동기(Dong Ki Lee),권상옥(Sang Ok Kwon),조미연(Mee Yon Cho),이경훈(Kyoung Hun Lee),김태현(Tae Heon Kim) 대한소화기학회 2001 대한소화기학회지 Vol.37 No.6
Multiple primary gastric malignant tumors are reported to constitute 1.25% of all gastric carcinomas. The simultaneous coexistence of adenocarcinoma and mucosa-associated lymphoid tissue (MALT) lymphoma of the stomach is very rare. Moreover, both gastric carcinoma and primary gastric MALT lymphoma are considered to be related with Helicobacter pylori (H. pylori) infection. However, the precise role of H. pylori in gastric carcinogenesis and lymphomatogenesis still remains as a challenging part of gastroenterology. We present here a rare case of simultaneous gastric MALT lymphoma and adenocarcinoma of the stomach in a patient with evidence of H. pylori infection. The MALT lymphoma was successfully treated after the eradication of H. pylori. However, the gastroscopic biopsy of the other lesion of the stomach for 3-month follow-up demonstrated signet-ring cell carcinoma. We report the case of this synchronous neoplasm of the stomach related to H. pylori infection with a review of literature. (Korean J Gastroenterol 2001;37:455-460)
리튬이온이차전지용 고효율 음극(SiO-Graphite)
신혜민,도칠훈,김동훈,김효석,하경화,진봉수,김현수,문성인,김기원,오대희,Shin, Hye-Min,Doh, Chil-Hoon,Kim, Dong-Hun,Kim, Hyo-Seok,Ha, Kyung-Hwa,Jin, Bong-Soo,Kim, Hyun-Soo,Moon, Seong-In,Kim, Ki-Won,Oh, Dae-Hui 한국전기화학회 2008 한국전기화학회지 Vol.11 No.1
현재 상용화 되어있는 흑연의 저용량 문제를 해결하기 위해 실리콘이나 주석계 등 고용량 비탄소계 음극전극재료들이 연구되고 있다. 이 중 산화실리콘(SiO)은 초기 충전(환원)과정에서 Li이 삽입되면서 $Li_2O$생성으로 비가역 비용량이 발생하여 초기 싸이클에서 쿨롱효율이 낮고, 싸이클링에 따라 리튬 탈 삽입 과정의 비용량이 증가하는 특징으로 실제의 전지를 설계할 시 문제점을 가진다. 본 연구에서는 고용랑 특성을 나타내는 비탄소계 실리콘을 포함하는 리튬이차전지용 음극활물질과 흑연의 복합체를 제조하여 흑연으로 실리콘의 부피팽창을 완화시키고, 사이클 특성을 향상시키는 실리콘(SiO-Graphite) 재료를 개발하고, 산화실리콘과 흑연 복합체의 높은 비가역 용량의 해소와 싸이클에 따른 리튬 탈삽입 과정의 용량증가를 해소하기 위한 전처리를 통하여 초기 효율을 향상한 전극의 제조에 대하여 연구하였다. A new anode composition material comprising of SiO and Graphite has been prepared by adopting High energy ball milling (HEBM) technique. The anode material shows high initial charge and discharge capacity values of 1139 and 568 mAh/g, respectively. The electrode sustains reversible discharge capacity value of 719 mAh/g at 30th cycle with a high coulombic efficiency${\sim}99%$. Since the materials formed during initial charge process the nano silicon/$Li_4SiO_3$ and $Li_2O$ remains as interdependent, it may be expected that the composite exhibiting higher amount of irreversibility$(Li_2O)$ will deliver higher reversible capacity. In this study, constant current-constant voltage (CC-CV) charge method was employed in place of usual constant current (CC) method in order to convert efficiently all the SiO particles which resulted high initial discharge capacity at the first cycle. We improved considerably the initial discharge specific capacity of SiO/G composite by pretreatment(CC-CV).
김현수(Hyeon Soo Kim),이우진(Woo Jin Lee),최정훈(Jeong Hun Choi),권용래(Yong Rae Kwon) 한국정보과학회 1995 정보과학회논문지 Vol.22 No.2
Intelligent Network(IN) evolves into Advanced IN(AIN) in which customers themselves create and control telecommunication services easily and rapidly. AIN needs an environment for customers to introduce various services easily and a mechanism to formally verify customer-defined services. In this paper, we discuss a method based on the visual programming techniques to create the services that customers need. Also we suggest a formal specification method using Petri-nets to model the customer-defined services, and the methods which can be applied to examination of two classes of problems : verifying completeness of the specifications of each service and detecting feature interactions among service features. Several Petri-net analysis techniques can be used for examining the problems. 지능망에서는 서비스 제공자만이 서비스를 제공하던 방식에서 점차 고객이 직접 서비스를 정의하고 제어하는 방식으로 진화하고 있다. 따라서 사용자들이 쉽게 그들이 원하는 서비스를 기술할 수 있는 방법과 사용자들에 의해 기술된 서비스를 엄격하게 검증하기 위한 방법이 필요하게 되었다. 이 논문에서는 서비스 정의 방법으로 재사용 기법과 시각적 프로그래밍 방법을 이용한 서비스의 표현 방법을 살펴 보고, 사용자가 정의한 서비스를 검증하기 위한 방법으로, 서비스를 페트리 네트를 기반으로 하는 정형화된 표현 형태로 변환하는 방법과 다양한 페트리 네트의 분석 방법을 이용한 서비스의 완전성 검사 및 서비스 간의 상호작용 검사 방법을 제안한다.
U형 장약홀더를 이용한 발파공법에서 지반진동 저감특성 및 파괴효율에 관한 수치해석적 연구
김현수 ( Hyon Soo Kim ),백범현 ( Beom Hyun Baek ),오세욱 ( Se Wook Oh ),한동훈 ( Dong Hun Han ),조상호 ( Sang Ho Cho ) 대한화약발파공학회 2016 화약발파 Vol.34 No.1
It is necessary to minimize ground vibration and noise due to blasting work in urban environment. The blast induced ground vibration and noise are generally generated by a portion of detonation energy, where most of the energy is utilized for rock breakage and movement of rock mass. Recently a blast method utilizing U-shaped steel charge holder was suggested to reduce the ground vibration without decreasing destructive power toward the free surface. In this study, single hole blasting utilizing U-shaped steel charge holder were simulated and the stress waves caused by the detonation of explosives were monitored using AUTODYN software. In order to examine the fragmentation efficiency of the U-shaped steel charge holder, one free face blasting models which adapt the blast induced stress waves were simulated by dynamic fracture process analysis (DFPA) code. In addition, the general blasting models were also simulated to investigate the fragmentation effectiveness of the U-shaped steel charge holder in rock blasting.