상태합성기 설계를 위한 상태 CHDL 기술 및 기호최소화 알고리듬개발

김희석,Kim, Hi-Seok 대한전자공학회 1989 전자공학회논문지 Vol. No.

상태합성기를 설계하기 위해 상태 CHDL 기술 및 기호간소화 알고리듬을 제안하였다. 상태 CHDL은 PLA에 의한 FSM설계에 매우 적합하며 제안된 기호간소화 알고리듬은 단일큐브포함, 1거리병합 알고리듬을 이용하였다. BOLD 논리최소화 tool을 이용한 상태합성의 절차를 교통신호제어기 등의 예를 들어 설명하였다. A Symbolic cover Minimization Algorithm and State CHDL Description for Finite State Machine Synthesizer are Presented. State CHDL are used for design of PLA based finite state machine, also the symbolic cover minimization algorithms are based upon single cube containment and distance 1 merging algorithms. The procedure for state machine synthesizer has been applied to practical example, including traffic light controller by using Boulder Optimal Logic Design System.

전력 분석에 안전한 AES에 대한 새로운 종류의 충돌쌍 공격

김희석,박학수,홍석희,Kim, HeeSeok,Park, Hark-Soo,Hong, Seokhie 한국정보처리학회 2013 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.2 No.9

본 논문에서는 일차 전력 분석에 안전한 AES의 마스킹 기법을 분석할 수 있는 새로운 충돌쌍 공격을 제안한다. 제안하는 충돌쌍 공격은 기존 충돌쌍 공격의 단점인 선택 평문 공격의 단점을 극복하고 기지 평문 공격이 가능하도록 구성되어진다. 또한 제안하는 분석기법은 이차 전력분석보다 효율적이며 최근 제안된 충돌쌍 공격에 요구되는 파형 개수에 비해 약 1/27.5배의 파형만을 요구한다. 논문에 포함된 실험 결과들은 이러한 사실을 뒷받침한다. 본 논문에서는 또한 새로운 분석 기법과 함께 이 방법을 방어할 수 있는 간단한 대응방법을 소개하도록 한다. This paper introduces a new collision attack on first-order masked AES. This attack is a known plaintext attack, while the existing collision attacks are a chosen plaintext attack. In addition, our method is more efficient than the second-order power analysis and requires about 1/27.5 power measurements by comparison with the last collision attack. Some experiment results of this paper support this fact. In this paper, we also introduce a simple countermeasure, which can protect against our attack.

소에 있어서 이식 수정란의 생존성에 영향을 미치는 요인에 관한 연구

김희석,오성종,양보석,유승환,김종국,이근상 ( H . S . Kim,S . J . Oh,B . S . Yang,S . H . Yoo,J . G . Kim,K . S . Lee ) 한국축산학회 1986 한국축산학회지 Vol.28 No.9

This experiment was conducted to investigate the effects of the number of embryos transferred, state (fresh or frozen), developmental stage of embryos and donor-recipient synchrony on pregnancy rate and embryonic loss in cattle. The animals used in this experiment were 95 heads of Korean native cattle, Holstein and crossbred. The results obtained in this experiment are as follows; 1. Fourty six out of 95 recipients (48.4%) were pregnant and embryo mortality rate (EMR) was 23.2%. 2. The pregnancy rate was higher when an embryo was transferred additionally on day 7after the AI on estrus (59.1%) than when one (45.6%) or two (40.0%) embryos were transferred. However, EMR was also higher when an embryo transferred additionally than the other groups. 3. The pregnancy rate of cows transferred fresh embryo was higher (56.0% vs 45.7%) and EMR of fresh embryo transferred cows was lower (20.0% vs 24.3%) compared with those of cows transferred frozen-thawed embryo. 4. The pregnancy rate was slightly higher (50.0% vs 48.1%) when the embryo of blastocyst stage was transferred than when the embryo of morals stage. However, EMR was slightly lower in the cows transferred morals stage embryo (22.8% vs 25.0%). 5. The pregnancy rate when the donors showed estrus 12 hours earlier than the recipients (76.9%) was higher than when the donors and recipients showed estrus at the same time (45.5%) or when the donors showed estrus 12 hours later than the recipients (37.5%). Similar trends were also noted in EMR.

소에 있어서 비외과적 채란 및 이식에 관한 연구

김희석,오성종,양보석,이근상,정길생 ( H . S . Kim,S . J . Oh,B . S . Yang,K . S . Lee,K . S . Chung ) 한국축산학회 1985 한국축산학회지 Vol.27 No.4

These experiments were conducted to investigate the effects of hormone treatment, serum total cholesterol (T-CHO) levels and flushing site on ova recovery and transfer method on pregnancy rate in cattle. The best number of ova recovered among PMSG treatments was showed in PMSG 3000IU + PGF₂α 25㎎ and the number of ova recovered and recovery rate of FSH were more than those of PMSG. In serum T-CHO levels, the case of more than 150㎎/100㎖ in superovulated cattle showed higher than those of below 150㎎/100㎖ in ova recovery. The recovery rate of uterine body was slightly better than that of each uterine horn. Cleavage stage of ova recovered on 7 to 8 days following estrus were mostly morulae and blastocysts and the average normal rate of ova recovered was 78.7%. The mean length of the cycle preceeding PMSG and FSH treatment were 52.38±20.90 and 23.83±13.26 days, respectively. When PGF₂α was administrated after flushing, the day of interval from the induced estrus to spontaneous estrus tended to shorten. The pregnancy rate in single, A1 + single and twin was 22.0, 35.7 and 35.6%, respectively.

소에 있어서 다배란 유기에 영향을 미치는 요인에 관한 연구

김희석,김영진,이종문,이근상,정길생 ( H . S . Kim,Y . J . Kim,J . M . Lee,K . S . Lee,K . S . Chung ) 한국축산학회 1985 한국축산학회지 Vol.27 No.4

These experiment were conducted to investigate the effects of the kinds and dosages of gonadotropins, breed, parity, body weight, season, milk yield and serum total cholesterol (T-CHO) levels on ovarian responses in superovulated cattle. The number of follicles and corpus luteum (CL) per head in superovulated cattle were 6.6±080 and 4.8±0.72. Superovulation with FSH resulted in ovarian response more than that of PMSG and the best ovarian response in parity, body weight and season was showed in heifer, 350-450㎏ and autumn, respectively. In the calving-superovulation interval, below 5 month was showed poor ovarian response. In the lactating dairy cows, the best ovarian response was showed in below 15㎏/day of milk yield and decreased as milk yield increased. In the serum T-CHO levels, the best result was obtained from more than 150㎎/100㎖ and the ovarian response increased as the serum T-CHO levels increased.

한우정액의 이화학적 성장에 관한 연구

김희석,정길생 ( Hee S . Kim,Kil S . Chung ) 한국축산학회 1979 한국축산학회지 Vol.21 No.4

This experiment was carried out to clarify the physical and chemical characteristics of whole semen, seminal plasma and spermatozoa in Korean native bull. The results obtained were summarized as follows: 1. Semen volume, sperm density and total number of sperm were on the average 5.9±0.23 ㎖, 10.74±0.71 10^8/㎖ and 63.43±2.13 10^8 /ejaculate respectively. All of them were higher in Spring and Winter than in Summer and Autumn. 2. The pH value, viscosity, specific gravity and dry weight of whole semen were 6.5±0.03, 5.5±0.43, 1.036±0.002 and 9.9±0.20% respectively. The pH value was lowest in Summer while the viscosity and specific gravity were highest in winter and the dry weight was heaviest in Spring. 3. The mean values of sodium in whole semen, seminal plasma and spermatozoa were 195.87±76.8 ㎎/100㎖, 197.36±34.94㎎/100㎖ and 56.46±24.75γ/10^8 and those of potassium were 183.75±42.32 ㎎/100m1, 191.59±43.23 ㎎/100 ㎖ and 56.91±18.85 γ/10^8 respectively. The mean values of chloride were 353.23±44.82 ㎎/100 ㎖, 225.43±30.68 ㎎/100㎖ and 136.08±13.02γ/10^8 and those of total phosphorus were 60.37±6.21㎎/100㎖. 33.19±2.77 ㎎/100㎖ and 25.03±2.14 γ/10^8 respectively. 4. Concentrations of fructose and citric acid in whole semen were 393.60±77.55 ㎎/100 ㎖ and 552.58±67.12 ㎎/100 ㎖, in seminal plasma 722.40±181.14 ㎎/100 ㎖ and 649.06±61.82 ㎎/100 ㎖, and in spermatozoa 46.19±8.81 γ/10^8 arid 110.64±8.32γ/10^8. 5. Average total nitrogen values in whole semen, seminal plasma and spermatozoa were 1577.95±86.92 ㎎/100㎖, 1266.1±198.92 ㎎/100 ㎖ and 536.84±119.34γ/10^8, non-protein nitrogen in these were 351.8±99.21 ㎎/100 ㎖, 374.9±73.88 ㎎/100 ㎖ and 159.20±29.29 γ/10^8, and urea were 26.89±8.29 ㎎/100 ㎖, 38.24±10.25 ㎎/100 ㎖ and 5.94±1.45γ/10^8 respectively. 6. Total amino acid in whole semen, seminal plasma and spermatozoa were 8474.32 ㎎/100m1, 6901.73 ㎎/100 ㎖ and 3220.72γ/10^8 respectively. 7. Average values of the total lipid in whole semen, seminal plasma and spermatozoa were 702.4±53.9 ㎎/100㎖, 492.5±6.1 ㎎/100 ㎖ and 322.2±56.5 γ/10^8, phospho lipid 130.9±8.8 ㎎/100 ㎖, 83.7±6.8 ㎎/100 ㎖ and 70.5±9.9 γ/10^8, and total. cholesterol 282.4±41.3 ㎎/100 ㎖, 189.8±7.1 ㎎/100 ㎖ and 81.6±13.4γ/10^8 respectively.

WTO/TBT 협정과 전기기술설비기술기준에 대한 검토(I)

김희석,Kim, Hui-Seok 한국전기기술인협회 2006 電力技術人 Vol.286 No.-

WTO/TBT 협정과 전기설비기술기준에 대한 검토( II )

김희석,Kim, Hui-Seok 한국전기기술인협회 2006 電力技術人 Vol.287 No.-

Efficient Masking Methods Appropriate for the Block Ciphers ARIA and AES

김희석,홍석희,Tae Hyun Kim,한동국 한국전자통신연구원 2010 ETRI Journal Vol.32 No.3

In this paper, we propose efficient masking methods for ARIA and AES. In general, a masked S-box (MS) block can be constructed in different ways depending on the implementation platform, such as hardware and software. However, the other components of ARIA and AES have less impact on the implementation cost. We first propose an efficient masking structure by minimizing the number of mask corrections under the assumption that we have an MS block. Second, to make a secure and efficient MS block for ARIA and AES, we propose novel methods to solve the table size problem for the MS block in a software implementation and to reduce the cost of a masked inversion which is the main part of the MS block in the hardware implementation.

시간제약 조건을 고려한 CPLD 기술 매핑 알고리즘 개발

김희석,변상준,Kim, Hi-Seok,Byun, Sang-Zoon 대한전자공학회 1999 電子工學會論文誌, C Vol.c36 No.6

In this paper, we propose a new technology mapping algorithm for CPLD under time constraint. In our technology mapping algorithm, a given logic equation is constructed as the DAG type, then the DAG is reconstructed by replicating the node that outdegree is more than or equal to 2. As a result, it makes delay time and the number of CLBs to be minimized. Also, after the number of multi-level is defined and cost of each nodes is calculated, the graph is partitioned in order to fit to k that is the number of OR term within CLB. The partitioned nodes are merged through collapsing and bin packing is performed in order to fit to the number of OR term within CLB. In the results of experiments to MCNC circuits for logic synthesis benchmark, we can shows that proposed technology mapping algorithm reduces delay time and the number of CLBs much more than the existing tools of technology mapping algoritm. 본 논문에서는 시간제약 조건을 고려한 새로운 CPLD 기술매핑 알고리즘을 제안한다. 본 기술매핑 알고리즘은 주어진 논리식을 DAG로 구성하여 각 노드를 검색한 후, 출력에지가 2이상인 노드를 분할하지 않고 노드를 복제(replication)하여 DAG을 재구성함으로써 지연시간과 CLB의 개수가 최소화 되도록 하였다. 즉, 시간제약 조건과 소자의 지연시간을 이용하여 그래프 분할이 가능한 다단의 수를 정한다. 그런 다음 각 노드의 초기비용과 전체비용을 계산하여 CLB의 k-OR텀수보다 비용이 초과되는 노드를 분할하여 서브그래프를 구성한다. 분할된 서브그래프들은 collapsing을 통해 노드들을 병합하고 네 번째로 주어진 소자의 CLB안에 있는 k-OR텀 개수에 맞게 Bin packing를 수행하였다. 본 논 문에서 제안한 기술매핑 알고리즘을 MCNC 논리합성 벤치마크 회로들에 적용하여 실험한 결과 기존의 기술 매핑 툴인 TEMPLA에 비해 CLB의 개수가 18% 감소되었다.