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새로운 ERM-방법에 의한 미세구조 N-채널 MOSFET의 유효 캐리어 이동도와 소스 및 드레인 기생저항의 정확한 분리 추출
金炫昌(Hyun Chang Kim),曺洙東(Su Dong Cho),宋尙駿(Sang Jun Song),金大井(Dea Jeong Kim),金東明(Dong Myong Kim) 大韓電子工學會 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.12
미세구조 N-채널 MOSFET의 게이트-소스 전압에 의존하는 유효 채널 캐리어 이동도와 소스 및 드레인 기생저항의 정확한 분리 추출을 위해서 새로운 ERM 방법을 제안하였다. ERM-방법은 선형영역에서 동작하는 게이트 길이가 다른 두개의 소자(W<SUB>m</SUB>/L<SUB>m</SUB>=30㎛/0.6㎛, 30㎛/1㎛)에 적용되었고 유효 채널 캐리어 이동도를 모델링하고 추출하는 과정에서 게이트-소스 전압에 의존하는 소스 및 드레인 기생저항의 영향 을 고려하였다. ERM-방법으로 추출된 특성변수들을 사용한 해석적 모델식과 소자의 측정데이터를 비교해본 결과 오차가 거의 없이 일치하는 것을 확인하였다. 따라서 ERM-방법을 사용하면 대칭구조 및 비대칭구조 소자의 유효 채널 캐리어 이옹도, 소스 및 드레인 기생저항과 다른 특성변수들을 정확하고 효율적으로 추출 할 수 있을 것으로 기대된다. A new method, the external resistance method (ERM method), is proposed for accurate extraction of the gate bias-dependent effective channel carrier mobility (μ<SUB>eff</SUB>) and separated parasitic source/drain resistances (R<SUB>S</SUB> andR<SUB>D</SUB>) of n-channel MOSFET’s. The proposed ERM method is applied to n-channel LDD MOSFETs with two different gate lengths (W<SUB>m</SUB>/L<SUB>m</SUB>=30 ㎛/0.6 ㎛, 30 ㎛/1 ㎛) in the linear mode of current-voltage characteristics (I<SUB>D</SUB>-V<SUB>GS</SUB>, V<SUB>DS</SUB>). We also considered gate voltage dependence of separated R<SUB>S</SUB> and R<SUB>D</SUB> in the accurate modeling and extraction of effective channel carrier mobility. Good agreement of experimental data is observed in submicron n-channel LDD MOSFETs. Combining with capacitance-voltage characteristics, the ERM method is expected to be very useful for accurate and efficient extraction of μ<SUB>eff</SUB>, R<SUB>D</SUB>, R<SUB>S</SUB>, and other characteristic parameters in both symmetric and asymmetric structure MOSFET’s in which parasitic resistances are critical to the improvement of high speed performance and reliability.
CCD카메라를 이용한 생물감시장치의 독성자료 신뢰성 향상에 관한 연구
김현창(Hyun Chang Kim),김영석(Young Suk Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.10
우리나라 주요하천의 수질오염감시를 목적으로 물벼룩을 이용한 생물감시장치가 설치, 운용되고 있다. 기기 목적상 유해물질에 대해 신뢰성 있는 신속한 독성경보를 내릴 수 있어야 하고, 무인원격측정기기이므로 계절별, 연간 하천의 물리적인 변화에도 측정의 신뢰성이 확보되어야 한다. 국내에 운영중인 장비는 물벼룩의 단위시간당 뛰는 횟수(Impulse)를 측정하는 방법과 유영형태를 분석하여 독성지수(Toxicity)로 나타내는 방법이 있다. 두 장비가 동일한 조건에서 운전되었음에도 가동률과 긴급점검횟수가 다르게 나타났으며 원인은 용기 내 기포발생과 압력차이 등 여러 가지가 있다. 본 연구의 목적은 기포와 미시적인 압력의 영향을 감소시켜 측정의 불확실성을 줄이는 것이고, 나아가 생물감시장치가 어떤 환경에 설치되더라도 수질오염감시의 목적을 정상적으로 달성하는 데 기여하는 것이다. Water monitoring equipments using daphnia can be used to monitor the pollution levels of a country's main rivers. Such equipments should be capable of providing a prompt warning about increase in the contamination levels, which is evaluated on the basis of impulse number or toxicity index. As unmanned remote control equipments, they must provide reliable pollution monitoring results for each season and for the annual physical changes in each river. Two different equipments based on the impulse number and toxicity index showed different results for the operating rates and for the number of emergency checks required even though both were operated at the same conditions. The results are affected by many parameters such as the presence of any air bubbles and the microscopic pressure. The purpose of this study is to develop a method that can reduce the effect of bubbles or microscopic pressure on the monitoring data. We expect to achieve reliable monitoring data for water pollutants irrespective of the location of the equipment setup.
팬터그래프 방식의 전기버스 충전시스템을 위한 충전 인터페이스 및 통신 규약
김현일(Hyun-Il Kim),조현창(Hyun-Chang Cho),오국환(Koog-Hwan Oh) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
Due to the commercialization of electric buses in South Korea, charging methods for electric buses have been studied and implemented. Currently, plug-in charging methods are mainly dominated in South Korea. However, there are various 전기자동차 charging sockets for them and they are inconvenient due to the manual charging method. Recently, in North America and Europe, an automatic charging method, pantograph-type electric bus charging system, is being commercialized. It has the advantage that electric buses can automatically charge fast even when parking or stopping. This paper introduces charging interfaces and communication protocols of the pantograph charging system for electric buses.
새로운 ERM-방법에 의한 미세구조 N-채널 MOSFET의 유효 캐리어 이동도와 소스 및 드레인 기생저항의 정확한 분리 추출
김현창,조수동,송상준,김대정,김동명,Kim, Hyun-Chang,Cho, Su-Dong,Song, Sang-Jun,Kim, Dea-Jeong,Kim, Dong-Myong 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.12
A new method, the external resistance method (ERM method), is proposed for accurate extraction of the gate bias-dependent effective channel carrier mobility (${\mu}_{eff}$) and separated parasitic source/drain resistances ($R_S$ and $R_D$) of n-channel MOSFET's. The proposed ERM method is applied to n-channel LDD MOSFETs with two different gate lengths ($W_m/L_m=30{\mu}m/0.6{\mu}m,\;30{\mu}m/1{\mu}m$) in the linear mode of current-voltage characteristics ($I_D-V_{GS},\;V_{DS}$). We also considered gate voltage dependence of separated $R_2$ and $R_D$ in the accurate modeling and extraction of effective channel carrier mobility. Good agreement of experimental data is observed in submicron n-channel LDD MOSFETs. Combining with capacitance-voltage characteristics, the ERM method is expected to be very useful for accurate and efficient extraction of ${\mu}_{eff},\;R_D,\;R_S$, and other characteristic parameters in both symmetric and asymmetric structure MOSFET's in which parasitic resistances are critical to the improvement of high speed performance and reliability. 미세구조 N-채널 MOSFET의 게이트-소스 전압에 의존하는 유효 채널 캐리어 이동도와 소스 및 드레인 기생저항의 정확한 분리 추출을 위해서 새로운 ERM-방법을 제안하였다. ERM-방법은 선형영역에서 동작하는 게이트 길이가 다른 두개의 소자($W_m/L_m=30{\mu}m/0.6{\mu}m, 30{\mu}m/1{mu}m$)에 적용되었고 유효 채널 캐리어 이동도를 모델링하고 추출하는 과정에서 게이트-소스 전압에 의존하는 소스 및 드레인 기생저항의 영향을 고려하였다. ERM-방법으로 추출된 특성변수들을 사용한 해석적 모델식과 소자의 측정데이터를 비교해본 결과 오차가 거의 없이 일치하는 것을 확인하였다. 따라서, ERM-방법을 사용하면 대칭구조 및 비대칭구조 소자의 유효 채널 캐리어 이동도, 소스 및 드레인 기생저항과 다른 특성변수들을 정확하고 효율적으로 추출할 수 있을 것으로 기대된다.
우나무노(Miguel de Unamuno)의 철학(哲學)과 생(生)의 비극적(悲劇的) 감정(感情)
김현창 ( Hyun Chang Kim ) 서울대학교 인문학연구원 1989 人文論叢 Vol.22 No.-
Unamuno is at once a great author and a philosopher Spain produced at the beginning of the 20th century. Unamuno has a very original personality, knowing how to harmonize literature and philosophy. He is also a paradoxical and anti-rational writer, and the theme he treats repeatedly in his writings coincides with the essential philosophical subject. In this sense we can say he is a philosophical author. His works are, however, remarkable literary ones by their own quality. They are nevertheless no simple literarily decoration to the philosphical thinking. Unamuno is much too artistically and literary well-grounded to walk into that trap. When Unamuno writes, he tries to show us something more; for example he is haunted by the problem of human conscience after death. At the same time, his meditation centes on the man of flesh and bones, not on the abstract humanity. Reason is an enemy of life for Unamuno. For this he refuses to express his philosophy through reason. Arriving at the conclusion that reason can`t solve the problems of life and death, Unamuno chooses novel and drama, in other words, literature, as a means to express his philosophy. Inconvenience, life`s difficulties are the causes of anguish, and anguish appears when one can`t adapt oneself to the conditions of life. However it is through anguish we can arrive at truth and immortality. The tragical sentiment of life of Unamuno manifests itself when the author comes to realize that life and death depend on the Creator and not on himself. This doctrine has been made clear in "Niebla". This novel represents very well the philosophy of Unamuno`s tragical sentiment of life. According to Unamuno, religion presupposes the existence of man, not of God. The human desire to have the immortality of the soul makes man create religion. Unamuno refuses pure and unconditional faith. Eternal ignorance is not acceptable for Unamuno. You have to fight until death to conquer the mystery of life. This problem of faith is well expressed in "San Manuel bueno, martir." Unamuno has meditated much on death. His meditation is especially concentrated on the immortality of the soul. For Unamuno two means exist to conquer death: the first is immortality and the second resurrection. As far as his existentialism is concerned, he has been deeply influenced by Kierkegaard and Spinoza. Unamuno has realized his literature through philosophy and his philosophy through literature. Completing this monumental work he has shown us the new horizon literature and philosophy can have.
상태공간 측정을 통한 AD HOC 네트워크의 최적화 연구
김현창,정석문,Kim, Hyun-Chang,Chung, Suk-Moon 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.4
In this paper, Ad-hoc network is a collection of mobile nodes without any wired infrastructure. Design of efficient routing protocols in ad-hoc network is a challenging issue. An AODV routing protocol for wireless ad hoc networks one that searches for and attempts to discover a route to some destination node. We propose a technique that reduce the number of Routing packet. Our technique use variable values reflecting the condition of network. This also contributes to improve throughput.