저장신뢰도 유지를 위한 최적 2단계 주기적 검사정책

조용석,이주호,Cho, Yong-Suk,Lee, Joo-Ho 한국통계학회 2008 Communications for statistical applications and me Vol.15 No.3

본 연구에서는 장기간 보관 중인 장비의 신뢰도를 유지하기 위한 2단계 주기적 검사모형을 제안하였다. 제안된 모형은 불완전한 간이검사와 완전한 정밀검사를 단계적으로 사용하여 고장이 발견되거나 검사 후 저장신뢰도가 미리 정해진 값 이하로 떨어질 때 장비에 대한 오버홀을 수행한다. 제안된 모형을 사용하여 오버홀까지의 단위시간당 기대비용을 유도하고 이를 최소화하기 위한 절차를 구하였으며, 고장시간이 지수분포 및 와이블분포를 따를 경우 제안된 모형을 1단계 주기적 검사모형과 비용함수의 다양한 모수값에 대하여 비교하였다. 또한 실제 운용 중인 유도탄 시스템에 제안된 검사정책을 적용하여 현재 사용 중인 검사정책과의 비교를 수행하였다. In this thesis we propose a two-stage periodic inspection model for maintaining the reliability of a system in long-term storage. There are two types of tests available; a fallible test and an error-free test. The system is overhauled at detection of failure or when the storage reliability after inspection becomes less than or equal to the prespecified value. The expected cost per unit time until overhaul is derived and a procedure for minimizing the expected cost is suggested. The two-stage periodic inspection model is compared with the one-stage periodic inspection model for various parameters of the cost function when the failure time follows exponential and Weibull distributions. The proposed model is then applied to an existing missile system for comparison with the current inspection policy.

Diphenylpropylamidoposphate 의 합성과 PET 포에 대한 방염성

조용석(Yong Suk Cho) 대구가톨릭대학교 자연과학연구소 1993 응용과학연구논집 Vol.2 No.-

N/A N/A

공익연계 광고의 메시지 소구 유형과 기부수준의 명확성 정도가 광고효과에 미치는 영향

조용석(Yong Suk Cho),이명천(Myoung Chun Lee),황장선(Jang Sun Hwang) 한국광고홍보학회 2005 한국광고홍보학보 Vol.7 No.4

본 연구는 공익연계 광고의 효과에 공익연계 메시지와 명확성 및 기부율 수준, 소구유형(정보적/감성적), 그리고 소비자 특성 등이 어떤 영향을 미치는가에 대하여 실험을 통하여 알아보았다. 연구결과, 공익연계 메시지의 명확성 정도는 기부율을 명확하게 밝히는 것이 불분명하게(``수익금의 일부``) 제시하는 것보다 광고태도와 제품태도, 그리고 구매의도를 향상시킬 수 있다는 결과를 얻었다. 기부율에 따른 효과차이에서는 저관여 제품의 경우 약한 수준의 기부율(5%)이 가장 긍정적인 결과를 보였으며, 강한 수준(25%)에서는 감소하는 경향이 뚜렷하였다. 반면 고관여 제품에서는 기부율간의 효과 차이는 확인할 수 없었다. 공익연계 광고의 소구유형에서는 유의미한 차이가 나타나지 않았으나, 사회염려 수준이 높은 집단의 경우 저관여 제품에서 소구유형과 기부율 간의 상호작용 효과가 나타났다. 두 변인의 상호작용을 보았을 때 구매의도에서 기부율 5%는 정보적 소구가 더 효과적이라는 결과를 보여주지만, 기부율이 올라갈수록 광고는 감성적 소구가 더 효과적이라는 결과를 제시했다. 제품의 구매를 통해 남을 돕는다는 독특한 형태의 공익연계 광고를 효과적으로 실행하기 위하여서는 제품에 따라, 기부수준에 따라, 소구유형이 달라져야 하며, 사회염려 수준이 높은 집단에서는 공익연계 광고의 효과가 현저하게 나타난 결과를 통해 소비자의 사회지향 성향이나 정서적인 기분을 치밀하게 반영한 공익연계 광고가 제작된다면 더욱 효과적인 결과를 얻을 수 있음을 시사한다. This study investigated critical factors-ad message appeal, cause- related message vagueness, donation rate, and audience cognition-which can influence the effectiveness of cause-related advertising (CRA) with experimental method, The results show: ① the CRA message should be clearer to achieve more favorable Aad (attitude toward advertising), Ab (attitude toward the brand), and PI (purchase intention), ② in the case of lower-involvement product, weak donation rate ad was more effective than stronger rate (25%) of donation ones. However, in the case of higher-involvement product, no significant differences among different donation rates were found, ③ The advertising appeals did not have any significant effects, within the higher social Issue-related anxiety group the appeal type influenced the ad effectiveness. This reflects that higher IRA(Issue-related anxiety) group is highly involved in the cause-related message and the information should be processed actively, ④ Within the higher IRA group with lower-involvement product, interaction effect between appeal type and donation rate was verified. Especially, the PI reached higher score with 5% of donation rate and information appeal. However, as the donation rate increased, transformational appeal was more effective. A variety of managerial implications are available to solve what to say and how to say, which most practitioners should face. Most of all, the donation rate should be moderated for different target groups. The CRA, which consumers help other with purchasing products, should have different message strategy by product type, donation rate, appeal type, etc. The IRA, which the current study explored, is needed to be investigated with more sophisticated measures in the following studies. In fact, it was confirmed that higher IRA consumer groups were more preferable to the CRA message. This also verifies the importance of consumer characteristics for enhancing the effectiveness of CRA. It is also implied that any sophisticated CRA message stimulating the altruism and affective entity should be more effective.

직접복호법을 이용한 (255, 239) BCH 부호의 복호기

조용석(Cho Yong Suk),박차생(Park Cha Sang),이만영(Rhee Man Young) 대한전기학회 1988 대한전기학회 학술대회 논문집 Vol.1988 No.7

흡입화상이 동반된 중증화상환자에서 사망률 예측의 조기 인자로서 혈중젖산과 염기부족에 대한 연구

조용석(Yong Suk Cho),양형태(Hyeong Tae Yang),임해준(Haejun Yim),김도헌(Dohern Kim),허준(Jun Hur),김종현(Jong Hyun Kim),전욱(Wook Chun) 대한외과학회 2011 Annals of Surgical Treatment and Research(ASRT) Vol.80 No.2

Purpose: The aim of this study was to elucidate whether plasma lactate (PL) and base deficit (BD) are useful early parameters to predict the prognosis of burn patients with inhalation injury. In addition, one of the main objectives was to evaluate if PL and its change, BD and its change due to fluid resuscitation, adds additional information. Methods: A retrospective review was performed on 151 patients admitted to our burn intensive care unit who were suspected to have inhalation burn injury, and then were confirmed by fibreoptic bronchoscopy between 1 Jan 2008 and 31 Dec 2008. All patients received proper fluid and electrolyte resuscitation, pain management, nutritional support, wound care and surgical debridement of dead tissue by burn surgeon. Results: Initial PL, PL1 (24 hours later) and initial BD show statistical differences between survivors group and non-survivors group. A better chance of survival occurs when resuscitation results in normal PL values within 24 h. Moreover, an outcome predictor of shock and effective resuscitation could be defined by evaluating the changes of BD on Day 1. Normalization of the BD within 24 h is associated with a better chance of survival. Conclusion: Measuring PL, BD and their changes may help to identify burn patients either for adequacy of treatment, or selection of other therapeutic options. Therefore titration of burn resuscitation to normalize PL and BD levels may be a reasonable method to improve burn mortality.

갑상설관낭종 및 동의 임상적 고찰

조용석(Yong Suk Cho),박성길(Sung Gil Park),전성은(Seong Eun Chon),윤대근(Dae Kun Yoon),정봉화(Bong Wha Chung),허준(Jun Hur),조마해(Ma Hae Cho),조지웅(Ji Woong Cho),박윤규(Yoon Kyu Park),채승완(Seoung Wan Chae),조성진(Seong Jin Cho) 대한외과학회 2003 Annals of Surgical Treatment and Research(ASRT) Vol.64 No.3

재발 간세포암에서 재간절제의 적용과 치료성적

조용석(Yong-Suk Cho),김기둥(Ki-Doong Kim),김인후(In-Hoo Kim),이동식(Dong-Shik Lee),윤성수(Sung-Su Yoon),김홍진(Hong-Jin Kim),강수환(Su-Hwan Kang) 대한외과학회 2005 Annals of Surgical Treatment and Research(ASRT) Vol.68 No.2

흡입화상 환자에서 발생한 중추성 요붕증

조용석(Yong Suk Cho),임해준(Haejun Yim),김도헌(Dohern Kim),허준(Jun Hur),전욱(Wook Chun),김종현(Jong Hyun Kim) 대한외과학회 2008 Annals of Surgical Treatment and Research(ASRT) Vol.75 No.6

Central diabetes insipidus (DI) is caused by failure of ADH release from the posterior pituitary gland. Common causes of central DI in critically ill patients include traumatic brain injury, anoxic encephalopathy, meningitis, primary or metastatic brain tumor and brain death. Inhalation burn injury with thermal injury can cause profound brain damage according to the degree of gas inhalation. This results in pituitary failure with diabetes insipidus (DI) and secondary adrenal insufficiency. We recently experienced 3 cases of central diabetes insipidus with inhalation burn injury, aggravated polyuria and abnormal serum or urine osmolarity. Severe burn injury is not easy to treat in and of itself, moreover, if central diabetes insipidus is combined it is difficult to manage appropriately. Therefore, if we suspected central diabetes insipidus, early aggressive control would lower mortality and morbidity. We report therapeutic experience in these cases with a review of the literature.

화상환자의 영양 치료

조용석 ( Yong Suk Cho ) 한국정맥경장영양학회 2014 한국정맥경장영양학회지 Vol.6 No.2

Major burns lead to a hypermetabolic response that is more dramatic than that observed in any other disease or injury. In addition, major burns increase the metabolic demands of the body and can lead to severe loss of body weight and increased risk of mortality. The hyper-metabolic response is accompanied by severe catabolism and a loss of lean body mass and by a progressive decline of host defenses, which results in impairment of the immunological response. The protective functions of intact skin are lost, leading to increased risk of infection and protein loss. Therefore, adequate and timely provision of nutritional support is an essential component of care of the critically ill burn patient. Nutrition therapy is also important in burn care from the early resuscitation phase until the end of rehabilitation. Careful assessment of the nutritional state of the burn patient is also important to reducing infection, recovery time, and long-term results. Nutritional therapy in severe burns has evidence-based specificities that contribute to improve clinical outcomes.

LSB 우선 비트직렬 정규기저 곱셈기의 하드웨어 구현

조용석(Yong-Suk Cho) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.1

Normal basis has been widely used for the representation of binary field elements mainly due to its low-cost squaring operation. In this paper, we design and implement LSB-first bit-serial normal basis multiplier over GF(2<SUP>m</SUP>). This multiplier is of serial (or sequential) type, i.e., after receiving the coordinates of the two input field elements, it goes through m iterations (i.e., clock cycles) to finally yield all the coordinates of the product in parallel. The proposed multiplier is faster and requires less hardware resources as compared to previously proposed normal basis multipliers over GF(2<SUP>m</SUP>). One unique feature of the proposed architecture is that the critical path delay of the multiplier is not a function of the field size which is the case for the previously proposed multiplier. The high-speed nature of the multiplier makes it suitable for high-speed public key cryptography applications where fast finite field multipliers in large fields are needed. In addition, the proposed architecture is highly regular, simple, expandable and therefore, well-suited for VLSI implementation.