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System Management of Human Object on the Industrial Safety
Chol-U Lee,Jung-Hoon Lee,Ryum-Duck Oh 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.5
In dangerous industry fields such as construction, shipbuilding, the mining industry, and other field, many employees have lost their life due to risky environment. As result, the costing of social and industry have been increased. To solve this problem, wireless body area network technology can implement by converging ubiquitous sensor network and wireless data communications. The wireless body area network technology has been issued recently and studied by standard institutes (e.g. IEEE TG 802.15.6), universities, and research labs. This paper studies management issues in wireless body area network for industry safety. We design human object as wireless body area network on the employee’s body and propose management method for industry safety.
소형 임베디드 시스템에서 안전한 원격 업데이트를 위한 부트로더의 설계 및 구현
이원영(Won-Young Lee),박성현(Seong-Hyeon Park),이철우(chol-U lee),민홍기(Hong-Ki Min),이응혁(Eung-Hyuck Lee) 대한전자공학회 2018 대한전자공학회 학술대회 Vol.2018 No.6
In this paper, we propose a remote update bootloader the small embedded systems. The proposed bootloader verifies the integrity of the program code system at starting of the operation and executes the user program if there is no abnormality. If an abnormality is found, the function of restoring the previously operated program is added to secure the safety of the system. After checking the operation of the proposed bootloader, the update in the normal situation was successful. And we wrote another code to the user area to confirm the restoration function and confirmed that the hash value is restored because it does not match.
시속 200㎞급 고속철도차량의 공조시스템 소음저감기술개발
박철희(Chol-Hui Pak),이우식(U. Lee),주재만(JaeMan Joo),김주홍(Joohong Kim) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
This study represents the technique about the noise reduction of HVAC equipment for high speed train(HST) operating at 200 ㎞/h. HST is different from the low speed train in the various points as well as the speed. Especially, the noise of cabin is closely related to the comfort of passenger and the noise from HVAC is one of main noise source in the cabin. In this study, the noise from HVAC was reduced by 5 ㏈(A)" using the concept of multiple resonator and guide vein. Therefore, the noise of cabin decreased from 60 ㏈(A) to 55 ㏈(A) at the center of the cabin.
Koh, Chol-Won,Lee, U-Hwang,Song, June-Kyu,Lee, Hae-Rim,Kim, Min-Hye,Suh, Myungkoo,Kwon, Young-Uk Wiley (John WileySons) 2008 Chemistry, an Asian journal Vol.3 No.5
<P>We report the preparation of mesoporous titania thin films with the R$\bar 3$m pore structure derived from the Im$\bar 3$m self-assembled ordering of the titania species and an EO(106)PO(70)EO(106) triblock copolymer. The films were spin-cast and then aged at 18 degrees C at a relative humidity of 70 %, which led to the orientation of the Im$\bar 3$m structure with the [111] direction perpendicular to the substrates. The [111] body-diagonal channels became vertical channels upon calcination at 400 degrees C, thus leading to thin films with vertical channels. The pores are ordered over a large area of up to 1 mum(2). The titania films can be formed on various types of substrates. By using a titania film formed on a Pt-coated Si wafer as a template, we produced by an electrochemical-deposition technique arrays of gold nanowires, whose morphology suggests that most of the pores of the titania thin films are accessible. The pore structure of vertical channels is stable up to 600 degrees C, at which temperature the wall materials crystallize into anatase.</P>
2종류의 건조기로 제조한 돌기해삼(Apostichopus japonicus)의 복원율과 지방산조성 비교
정우철 ( U-cheol Jeong ),( Feng Jin ),( Anisuzzaman Md ),최병대 ( Byeong-dae Choi ),정현철 ( Hyun-chol Jung ),이상로 ( Sang-ro Lee ),강석중 ( Seok-joong Kang ) 한국수산과학회(구 한국수산학회) 2019 한국수산과학회지 Vol.52 No.3
Approximately 80% of the world’s sea cucumbers Apostichopus japonicas are processed into dried sea cucumbers. The hot air-drying method is currently used in industry, but it has many problems, such as a short drying time, severe browning, high nutrition loss, and low recovery. In this study, the moisture absorption rate, dry recovery rate, and lipid nutrient composition of sea cucumber dried by heat pump decompression and with a hybrid dryer were investigated. The moisture absorption rates for hybrid-dried sea cucumbers at 24, 48, 72, 96, and 120 h were 241.3%, 427.7%, 652.0%, 721.0%, and 742.2%, respectively. The moisture absorption rates for hot air-dried sea cucumbers were 155.8%, 240.0%, 390.3%, 655.5%, and 667.4%, respectively. Thus, moisture absorption was faster and greater with hybrid drying than with hot air drying. The dry recovery rate at 24 h was greater for hybrid-dried sea cucumber (70.7%) than for hot air-dried sea cucumber (59.8%). Saturated fatty acid contents of the hybrid- and hot air-dried sea cucumbers were 30.0% and 37.5%, respectively. Moreover, greater Σn-3 polyunsaturated fatty acid content was found in hybrid-dried sea cucumber (15.8%) than in hot air-dried sea cucumber (11.7%).
극수비교에 의한 GF(3)의 일반화된 Reed-Muller 계수 생성 방법
이철우,김흥수,Lee, Chol-U,Kim, Heung-Soo 한국전기전자학회 1999 전기전자학회논문지 Vol.3 No.2
본 논문에서는 다치논리 함수의 GRM(Generalized Reed-Huller)계수 생성 방법에 관하여 제안하였다 일반적인 GRM계수의 생성 방법은 Reed-Muller(RM) 전개식를 이용하여 극수 P=0의 RM계수를 구하고 이를 확장하여 모든 GRM계수를 구하는 방법을 사용한다. 본 논문에서 제안한 알고리즘은 모든 극수의 GRM계수를 구하지 않고 극수의 0의 개수를 순차적으로 비교해가며 GRM계수를 구하는 방식이다. This paper presents a method for the generation of GRM coefncients over GF(3) by using a comparison of polarity. In general production method to GRM coefficients over GF(3) is searching for pn different polarity of an n-variable and from these optimal function according to the maximum number of zero coefficients is selected. This paper presents a method for the generation of GRM coefficients by means of compare to the number of zero coefficients without constructing the whole polarity GRM coefficients.
K-map상의 셀을 이용한 새로운 GRM 상수 생성 기법
이철우,차문철,김흥수,Lee Chol-U,Che Wenzhe,Kim Heung-Soo 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.9C
본 논문에서는 karnaugh map(k-map)상의 셀을 이용하여 $2^{n}$개의 서로 다른 극수(polarity)를 갖는 GRM(Generalized Reed-Muller)상수를 생성하는 새로운 기법을 제안하였다. n개의 입력변수에 대한 일반적인 GRM 함수의 생성 방법은 단일 변수에 대한 변환 행렬을 구하고 이를 n번의 Kronecker 곱을 행한 변환 행렬을 이용하여 GRM 상수를 구하는 것이다. 이런 방법을 사용하는 경우, 변수의 숫자가 증가함에 따라 변환 행렬의 차수가 $2^{n}\times2^{n}$로 커지는 단점을 갖는다. 이에 반하여 본 논문에서는 k-map상에서 변수를 축약시킨 셀 [$f_{i}$]을 구하고 이를 단일 변수 변환 행렬과 연산하여 GBM 상수를 구하는 새로운 기법을 제안한다. 본 논문에서 제안한 새로운 방법과 타 논문과의 비교를 한 결과, 기존 방법은 가산기, 승산기, KP(Kronecker 곱 승산기)회로가 필요한데 반하여 본 논문에서는 가산기만이 필요하므로 효율적인 VLSI 설계에 유리하다 In this paper we propose a new method to derive GRM(Generalized Reed-Muller) coefacients for each $2^{n}$ polarities using cell of karnaugh map(k-map). Generally, there are the serial and parallel method to derive GRM coefficients. As a serial method, Green method generates GRM coefncients using transform matrix. And as a parallel method, Besslich algorithm produces GRM coefficients of each polarity using the generated anteriorly. Green's method generates GRM coefficients for n-variable by calculating transform matrix for one-variable and n-times kronecker product this matrix. And Besslich's method generates GRM coefficients of each polarity in order of Grey-code. But those methods have disadvantages that the number of variable exceeding four makes transform matrix large and there are so many operation steps. In this paper, GRM coefficients is generated by producing cell [$f_{i}$] minimizing variable on k-map and operating this cell [$f_{i}$] and transform matrix for one-variable. So, we can generate GRM coefficients of all polarities easily by using the proposed method.