Design Methodologies for Reliable Clock Networks

Deokjin Joo,Minseok Kang,Taewhan Kim 한국정보과학회 2012 Journal of Computing Science and Engineering Vol.6 No.4

This paper overviews clock design problems related to the circuit reliability in deep submicron design technology. The topics include the clock polarity assignment problem for reducing peak power/ground noise, clock mesh network design problem for tolerating clock delay variation, electromagnetic interference aware clock optimization problem, adjustable delay buffer allocation and assignment problem to support multiple voltage mode designs, and the state encoding problem for reducing peak current in sequential elements. The last topic belongs to finite state machine (FSM) design and is not directly related to the clock design, but it can be viewed that reducing noise at the sequential elements driven by clock signal is contained in the spectrum of reliable circuit design from the clock source down to sequential elements.

A Fine-Grained Clock Buffer Polarity Assignment for High-Speed and Low-Power Digital Systems

Deokjin Joo,Taewhan Kim IEEE 2014 IEEE transactions on computer-aided design of inte Vol.33 No.3

<P>The clock buffer polarity assignment is one of the effective design schemes to mitigate the power/ground noise caused by the clock signal propagation in high-speed digital systems. This paper overcomes a set of fundamental limitations of the conventional clock buffer polarity assignment methods, which are: 1) the unawareness of the signal delay (i.e., arrival time) differences to the leaf clock buffering elements; 2) the ignorance of the effect of the current fluctuation of nonleaf clock buffering elements on the total peak current waveform; and 3) the inability of supporting low-power digital designs with multiple (dynamically operating) power modes. Clearly, not addressing 1 and 2 in the polarity assignment may cause a severe inaccuracy on the peak current estimation, which results in unnecessarily high peak current. Moreover, without tackling 3, designs may suffer from clock skew violation in some of the power modes, affecting circuit speed or reliability. To overcome the limitations, we propose a completely new fine-grained approach to the clock buffer polarity assignment combined with buffer sizing, formulating the problem into a multiobjective shortest path problem and solving it effectively for designs with a single power mode, while exploiting the flexibility of our multiobjective shortest path formulation for designs with multiple power modes. Through experiments using benchmark circuits, it is shown that the proposed approach is able to produce designs with 17% lower peak current and 20% lower power noise on average, compared with the results produced by the best ever known method.</P>

Double Over-expression of 6-Phosphofructokinase and Pyruvate Kinase for the Improved Butanol Production in Clostridium acetobutylicum ATCC 824

Deokjin JAHNG,Hui HU,Jey-R VENTURA 한국생물공학회 2012 한국생물공학회 학술대회 Vol.2012 No.4

Are college athletes' self-reflection and insight related to performance?

Deokjin Kim 국제문화기술진흥원 2022 International Journal of Advanced Culture Technolo Vol.10 No.4

The purpose of this study was to investigate whether there is a difference in self-reflection and insight according to the performance level of college athletes. A total of 395 (210 male, 185 female) college athletes from 6 universities were sampled. The level of performance was divided into upper, middle, and lower groups based on the results of matches played in the past 1 year. To measure self-reflection and insight, THE SELF-REFLECTION AND INSIGHT SCALE developed by Grant et al. [4] was used. As a result, there was a statistically significant difference according to the level of performance, and as a result of post-hoc(scheffe) analysis, the upper group of performance was higher than that of the middle group and the lower group.

The change of muscle dysmorphia through bodybuilding for 12 weeks : Korean college students

Deokjin Kim 국제문화기술진흥원 2019 International Journal of Advanced Culture Technolo Vol.7 No.2

The central purpose of the current research is to identify how 12-week bodybuilding exercise affects muscle dysmorphia. The research subjects consisted of an experimental group and a control group, each with 16 freshmen at college. MDI(muscle dysmorphic inventory), developed by Schlundt, Woodford, Brownlee(2000) was utilized to collect relevant data, which was analyzed by PASW 18.0. An independent two sample t-test was conducted to see whether there exists any significant difference between the two groups in the pre- and the post-tests. A paired t-test, in turn, was performed to identify whether there is any difference between the two tests for each group. The statistical significance level was set at p<.05. It was found that the experimental group marked a higher level of muscle dysmorphia than the control group in the pre-test. It was also found that muscle dysmorphia of the experimental group increased in the post-test, while no significant difference was manifested in the control group in the post-test.

피혁폐기물 및 음폐수의 통합 혐기성소화에서 기질의 C/N 비가 바이오가스 발생에 미치는 영향

장덕진 ( Deokjin Jang ),이종근 ( Jongkeun Lee ),김가빈 ( Gabin Kim ),이관용 ( Kwanyong Lee ),박기영 ( Ki Young Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2018 No.-

가죽제품 제조 산업으로부터 발생되는 피혁폐기물의 양은 투입되는 원료 가죽의 약 50%를 차지하는 것으로 알려져 있다. 그러나 이들 피혁폐기물은 적절한 처리 방법이 개발되지 않아 대부분 매립이나 소각을 통해 처리되고 있다. 특히, 매립이나 소각을 통한 처리는 단가가 높아 관련 산업의 경제성을 악화시키고 고형폐기물의 친환경적 처리 관점에서 문제점이 제기되고 있는 실정이다. 최근 화석연료를 대체하기 위한 신규에너지원의 중요성이 높아짐에 따라, 폐기물을 이용한 에너지화에 많은 연구가 진행되고 있으며, 피혁폐기물은 주로 단백질과 지질로 구성되어 있는 특성으로 인해 혐기성소화를 통한 바이오가스 생산이 가능한 것으로 알려져 있다. 그러나 일반적으로 알려져 있는 혐기성소화 공정의 최적 C/N 비 (20-30)를 고려할 때, 피혁폐기물의 높은 C/N 비 (약 35)는 공정의 제한요소가 될 수 있다. 본 연구에서는 피혁폐기물과 음폐수를 통합하여 혐기성소화를 실시함으로써 기질의 C/N 비 조절이 혐기성소화 효율에 미치는 영향을 관찰하였다. 기질의 C/N 비 조절을 통한 혐기성소화 효율의 변화는 BMP (Biochemical methane potential) test를 약 40일간 진행하였으며, 바이오가스 발생량을 비교하였다. 실험은 경기도 동두천시에 위치한 가죽제품 제조업체로부터 수거된 pelt scrap과 양주시에 위치한 음식물쓰레기 자원화시설에서 발생되는 음폐수를 각각 채취하여 사용하였다. 개별 기질의 C/N 비는 피혁폐기물이 34.1, 음폐수가 13.5로 확인되었으며, 이들의 무게에 따른 혼합비를 조절하여 통합 혐기성소화 기질의 C/N 비를 20, 25, 30으로 맞춰 실험을 진행하였다. 실험결과 기질을 통합하여 C/N 비를 조절한 소화 조건에서 개별 기질의 단독소화 조건보다 많은 바이오가스 생산량이 관찰되었으며, C/N 비 20에서 바이오가스 생산량이 높은 것으로 나타났다. 이는 통합 기질의 C/N 비 조절효과와 함께 피혁폐기물에 비해 생분해도가 높은 음폐수 함량이 기질의 C/N 비가 낮을수록 더 많이 포함되었기 때문으로 판단된다.

한글 초록 문장 태깅을 위한 BRAT의 확장 구현

서덕진(DeokJin Seo),김영우(YeoungWoo Kim),정유철(YUCHUL JUNG) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2

BRAT은 자연 언어 처리(NLP)에 필요한 학습데이터를 구축하는데 널리 사용되고 있는 웹기반 태깅 도구이다. 기존의 BRAT은 수동 태깅 환경을 제공하고 있지만, 기 학습된 모듈을 연동하여 자동 태깅하는 환경을 제공하지는 않는다. 본 논문에서는 brat rapid annotation tool(BRAT)을 두 가지 측면에서 확장한 내용을 소개한다. 한글논문 초록을 선 태깅(pretagging) 하여 수동작업자의 작업효율을 올릴 수 있게 하였으며, 작업자 별 태깅 결과를 저장하는 기능을 확대 구현하였다.

Design Methodologies for Reliable Clock Networks

Joo, Deokjin,Kang, Minseok,Kim, Taewhan Korean Institute of Information Scientists and Eng 2012 Journal of Computing Science and Engineering Vol.6 No.4

This paper overviews clock design problems related to the circuit reliability in deep submicron design technology. The topics include the clock polarity assignment problem for reducing peak power/ground noise, clock mesh network design problem for tolerating clock delay variation, electromagnetic interference aware clock optimization problem, adjustable delay buffer allocation and assignment problem to support multiple voltage mode designs, and the state encoding problem for reducing peak current in sequential elements. The last topic belongs to finite state machine (FSM) design and is not directly related to the clock design, but it can be viewed that reducing noise at the sequential elements driven by clock signal is contained in the spectrum of reliable circuit design from the clock source down to sequential elements.

GND Via를 이용한 Waveguide-기판집적도파관 (SIW) Transition 성능 개선

서덕진(Deokjin Seo),정재웅(Jaewoong Jung),박윤식(Yunsik Park),유종인(Jongin Ryu) 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.6

Predicting Story Comprehension of Preschool Children with and without Specific Language Impairment through Eye Movement and Executive Function

송덕진(Deokjin Song),임동선(Dongsun Yim) 한국언어청각임상학회 2020 Communication Sciences and Disorders Vol.25 No.4

배경 및 목적: 이야기 이해 능력은 학령전기 아동의 언어 능력뿐만 아니라 학령기의 학습 능력까지 뒷받침한다. 세 가지 집행기능의 하위 과제(갱신, 억제, 전환)와 시선추적기를 활용하여 온·오프라인으로 이야기 이해 처리 과정을 분석하고 이야기 이해를 가장 잘 설명할 수 있는 요인이 무엇인지 알아보고자 하였다. 방법: 만 4-6세의 일반 아동 17명, 단순언어장애 아동 11명이 연구에 참여하였다. 참조 및 추론적 이야기 이해 과제, 시선추적기를 이용한 이야기 처리 과정(평균 시선고정 시간), 집행기능을 대표하는 갱신, 억제, 전환 과제(n-back, flanker, DCCS)를 통해 두 집단의 차이를 비교하였으며 상관분석을 통해 각 변인들의 연관성을 알아보고 회귀분석을 통해 집행기능의 하위 요소 및 시선추적기 변수 중 어떠한 변인이 이야기 이해력을 예측해주는지 알아보았다. 결과: 단순언어장애 아동 집단은 참조 및 추론적 이야기 이해와 집행기능의 갱신 기능과 전환 기능에서 일반 아동 집단보다 어려움을 보였으며 이야기 내의 그림자극을 일반 아동 집단보다 짧게 응시하였다. 또한 단순언어장애 아동과 달리 일반 아동은 이야기 이해력과 집행기능의 하위 요소, 평균 시선고정 시간에서 상관관계를 보였으며 일반 아동의 참조 및 추론적 이해력을 설명하는 공통적인 능력은 갱신 능력이었다. 논의 및 결론: 일반 아동 집단은 단순언어장애 아동 집단 비해 집행기능을 활용하여 이야기를 효율적으로 이해하고 그림책에서 중요한 의미를 갖는 영역에 오랫동안 시선을 응시하여 학습에 도움을 받을 수 있음이 시사된다. Objectives: Story comprehension is an important ability that supports not only the language skills of preschool children but also their learning skills in school age. Through three subtasks of executive function (updating, inhibition, and shifting) and eye movement, we examined the process of children’s story comprehension online and offline. Also, we looked for the variable which predicts children’s story comprehension. Methods: Participants were 11 children with specific language impairment (SLI) and 17 typically developing children (TD) aged 4-6 years. Group differences were compared using story comprehension (reference comprehension and inference comprehension), updating, inhibition, shifting tasks (n-back, flanker, and DCCS) representing executive function and story processing using the eye tracker. Moreover, correlation analysis was conducted to find the relationship between variables, and regression analysis was used to determine which variable, executive function or eye tracker, predicts story comprehension. Results: The SLI group showed more difficulty in story comprehension and executive function than children in the TD group. Furthermore, the TD group gazed at important visual cues longer than children in the SLI group. The TD group showed a correlation between story comprehension and both the subelements of executive function and average fixation duration unlike the SLI group. Updating predicted reference comprehension and inference comprehension simultaneously in the TD group. Conclusion: It is suggested that TD children can understand stories more efficiently by using their executive function and also can distinguish areas of significance in picture books through staring at a subject for a long time to foster learning in contrast to children with SLI.