건설업 업역구조 변화에 관한 연구

이석재,김경래,유진근,김대호,Lee Seok-Jae,Kim Kyung-Rai,Yu Jin-Keun,Kim Dae-Ho 한국건설관리학회 2001 건설관리 : 한국건설관리학회 학회지 Vol.2 No.2

현재 건설산업의 업역은 크게 건설용역업과 건설업으로 구분되며 건설용역업은 건축설계업, 엔지니어링, 감리업 등으로 구분되고 건설업은 일반건설업과 전문건설업으로 구분되고 있다. 이런 건설산업의 업역화는 무자격업체가 무차별적으로 건설시장에 진입하는 것을 방지하여 건설업체의 전문성을 유지하고 소비자를 보호하는 긍정적 측면이 있는 반면에 업역화중에서 가장 논란의 대상이 되고 있는 일부 업역간의 겸업을 제한하고 있는 현행제도로 인해 발생되는 문제점들, 즉 건설생산 효율성의 낙후와 지대의 발생 등의 문제점을 야기시키고 있다. 따라서 향후 업역 제한 제도가 폐지되고 의무하도급제 등 건설기업의 의사 결정을 제약하는 각종 규제조치가 폐지될 경우 각 건설주체는 자신의 핵심 역량, 소비자의 니즈, 개별 상품시장을 시도할 것이다. 본 연구에서는 향후 건설시장 구조를 전망해 보고 이에 대한 각 건설기업들의 건설시장에 대한 진출전략을 제시하고자 한다. Business boundaries of firms in the construction industry are strictly regulated in Korea. Under the current law, firms involved in construction processes are classified into five categories; general contractors, specialty contractors, architects' offices, engineering firms, and specialized in inspection. Among these types of firms, general contractors are prohibited to enter into specialty contractor's market and vice versa by the basic law in the construction industry. Also general contractors are not allowed to provide architectural services. The purpose of the law is to prohibit unlicensed companies from entering the construction market and to protect customers. However, the law causes critical problems e.g. low efficiency of production and rent creation. Therefore, we identify problems concerning business boundaries of firms in the construction industry and predict structural changes in the them when they are liberalized. So we surveyed general contractors and specialty contractors in Korea to estimate the effects of the liberalization on the construction industry. Most of contractors point to the enhancement of production efficiency as the motivation to integrate other construction process. If current regulations, which limit firms' decisions on business boundaries, are eliminated, firms will choose optimal business scopes taking into account types of contracts adopted by the Government for public works. Based on the cost/benifit analyses, they will decide whether to intergrate other production processes or not.

하악골 골절환자에서 술후 자가통증조절장치와 근주용 진통제의 효과에 관한 비교

이석재,김경욱,김철환,Lee, Seok-Jae,Kim, Kyung-Wook,Kim, Chul-Hwan 대한악안면성형재건외과학회 2006 Maxillofacial Plastic Reconstructive Surgery Vol.28 No.1

Open reduction and rigid internal fixation is the most popular treatment method for maxillofacial fracture patients, and it is unevitable that postoperative pain can be developed. Many surgeons including oral & maxillofacial surgeons have made constant efforts to decrease postoperative pain. This study is a comparison of postoperative analgesia and intramuscular analgesia in patients with mandibular fractures. In this study, twenty-one patients (Experimental group) were randomly selected and they were injected with IV patient-controlled analgesia (PCA; Walkmed$^{(R)}$, USA). For control group another twenty-one patients were injected with intramusclar non-steroid anti-inflammatory drugs (Rheoma$^{(R)}$, Samsung Pharm. Co.). And then, we measured visual analogue scale (VAS) scores from first postoperative day to second day at regular time interval. The following results were uptained; 1. In patient group who with open reduction and rigid internal fixation, there was significant difference of postoperative analgesic effect during the first postoperative day(p<0.05). 2. In patient group with over 90 minutes surgery time, there was significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p<0.05). 3. In patient group with less than 90 minutes surgery time, there was no significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p>0.05). 4. In patient group with surgery of open reduction using rigid internal fixation at single fractured site, there was no significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p>0.05). 5. In patient group with surgery at two fractured sites, there was significant difference of postoperative analgesic effect during the first postoperative day when compared between experimental group and control group(p<0.05). As mentioned above, it suggest that patient-controlled analgesia is more effective for postoperative pain relief than intramuscular injection in patients with rigid internal fixation by open reduction after mandibular fracture occurred. Especially, it is considered that in patient with more than 90 minutes surgery time or in cases with multiple fractured sites had more effective results with PCA therapy than conventional intramuscular analgesics.

동양철학의 세계관을 집약시킨 ‘인검’과‘진검’

이석재,Lee, Seok-Jae 한국과학기술단체총연합회 2006 과학과 기술 Vol.39 No.7

심장 외막 측로관을 이용한 변형 Fontan씨 수술

이석재,김용진,Lee, Seok-Jae,Kim, Yong-Jin 대한흉부심장혈관외과학회 1993 Journal of Chest Surgery (J Chest Surg) Vol.26 No.5

We report three cases of children who underwent definitive conversion to the Fontan circulation using a new surgical technique, Extracardiac Epicardial Lateral Tunnel. This new procedure allows the operation to be performed as a totally extracardiac operation [especially in ventricular dysfunction] and allows it to be performed in a very small atrium and in cases with unsuitable pulmonary venous drainage.Our data suggest that this procedure may achieve satisfactory hemodynamics of the total cavopulmonary connection.

FOCUS - 나노 구조체 기반 적측형 프린팅 융합 응용기술

이석재,이경균,Lee, Seok-Jae,Lee, Gyeong-Gyun 한국과학기술단체총연합회 2014 과학과 기술 Vol.545 No.-

①조선의 환도 - 칼날 왼쪽 면 갈아 절삭력 극대화

이석재,Lee, Seok-Jae 한국과학기술단체총연합회 2006 과학과 기술 Vol.39 No.5

하악골 골절환자에서 술후 자가통증조절장치와 근주용 진통제의 효과에 관한 비교

이석재,김경욱,김철환,Lee, Seok-Jae,Kim, Kyung-Wook,Kim, Chul-Hwan 대한악안면성형재건외과학회 2006 Maxillofacial Plastic Reconstructive Surgery Vol.28 No.2

Open reduction and rigid internal fixation is the most popular treatment method for maxillofacial fracture patients, and it is unevitable that postoperative pain can be developed. Many surgeons including oral & maxillofacial surgeons have made constant efforts to decrease postoperative pain. This study is a comparison of postoperative analgesia and intramuscular analgesia in patients with mandibular fractures. In this study, twenty-one patients (Experimental group) were randomly selected and they were injected with IV patient-controlled analgesia (PCA; $Walkmed^{(R)}$, USA). For control group another twenty-one patients were injected with intramusclar non-steroid anti-inflammatory drugs ($Rheoma^{(R)}$, Samsung Pharm. Co.). And then, we measured visual analogue scale (VAS) scores from first postoperative day to second day at regular time interval. The following results were uptained; 1. In patient group who with open reduction and rigid internal fixation, there was significant difference of postoperative analgesic effect during the first postoperative day(p<0.05). 2. In patient group with over 90 minutes surgery time, there was significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p<0.05). 3. In patient group with less than 90 minutes surgery time, there was no significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p>0.05). 4. In patient group with surgery of open reduction using rigid internal fixation at single fractured site, there was no significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p>0.05). 5. In patient group with surgery at two fractured sites, there was significant difference of postoperative analgesic effect during the first postoperative day when compared between experimental group and control group(p<0.05). As mentioned above, it suggest that patient-controlled analgesia is more effective for postoperative pain relief than intramuscular injection in patients with rigid internal fixation by open reduction after mandibular fracture occurred. Especially, it is considered that in patient with more than 90 minutes surgery time or in cases with multiple fractured sites had more effective results with PCA therapy than conventional intramuscular analgesics.

수동표적추적장치의 휴먼운용자 모델링 및 입력명령형성기 설계

이석재,유준,Lee, Seok-Jae,Lyou, Joon 한국군사과학기술학회 2007 한국군사과학기술학회지 Vol.10 No.2

A practical method to design the input shaping which generates control command is proposed in this paper, We suggest an experimental technique considering human operator's target tracking error to improve aiming accuracy which significantly affects hit probability. It is known that stabilization performance is one of the most important factors for ground combat vehicle system. In particular, stabilization error of the manual target tracking system mounted on moving vehicle directly affects hit probability. To reduce this error, we applied input command shaping method using preprocessing filtering and functional curve fitting. First of all, we construct the human operator model to consider effects of human operator on our system. Input shaping curve is divided into several regions to get rid of the above problems and to improve the system performance. At example design part, we chose three steps of functional command curve and determine the parameters of the function by the proposed design method. In order to verify the proposed design method, we carried out the experiments with real plant of a fighting vehicle.

FOCUS-인재, 그 성장 잠재력에 주목하라

이석재,Lee, Seok-Jae 벤처기업협회 2003 벤처다이제스트 Vol.32 No.-

벤처기업이 인력을 채용하고 관리하기 위해서는 체계적인 인사논리로서 ‘역량 기반의 인적 자원관리’가 필요하다. 인재를 통해 장기적인 대외경쟁력을 유지하기 위해서는 그들의 성장 잠재력을 정확히 진단하고 육성하기 위한 전략으로서 역량기반의 인적 자원관리를 실시할 필요가 있다.

실시간 통합제어기법을 이용한 차량전자화 설계

이석재,민지홍,유준,Lee, Seok-Jae,Min, Ji-Hong,Lyou, Joon 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.3

The vetronics is necessarily required for enhancement of the operational capability and optimization of the system architecture. In this paper, we presents the realtime control methods for the vetronics of the fighting vehicles. We proposed the data distribution based on standard bus and computer resource for realtime and integrated control of the system. Embedded computers are designed considering extensibility and reliability of the system. The integrated display improves the operator's capability. We applied the network centric battle management and digital power control with intelligent switching elements to increase cooperated combat efficiency and reliability. To show the feasibility of the presented design schemes, the vetronics has been implemented and applied to a real fighting vehicle.