Mid-sized manufacturing companies, which account for 0.7%(5,480 companies), 13.8%(1.169 million persons) of total employment, and 15.7% of total sales, have recently experienced a lot of difficulties in management activities due to the impact of COVID-19, the U.S.-China trade war, and the collapse of global supply chains. To overcome this, revitalization of quality management activities to strengthen corporate competitiveness is emerging as an urgent task. In order for these quality management activities to achieve their intended purpose, the positive leadership of corporate managers is very important above all else. There have been many studies related to positive leadership, but most have focused on charismatic leadership and transformational leadership centered on large companies or small and medium-sized enterprises. Therefore, this study aims to present ways to strengthen the leadership of managers by empirically analyzing how the positive leadership of managers of mid-sized manufacturing companies, which was relatively under-researched, affects quality management activities and Business performance(Balanced Score Card; BSC).

본 연구에서 Nematus tibialis를 국내에서 처음으로 보고한다. 이 종의 사진과 진단, 색 변이, 발육 단계와 분포 등을 제공하였다.

본 연구를 통해 Spathius속의 Spathius depressithorax Belokobylskij, 1998 <납작가슴자루배고치벌 (신칭)>를 우리나라에서는 처음으로 보 고한다. 본 종의 식별형질과 성충을 검경하고 도해하였으며, 한국산 Spathius속의 목록을 제시한다.

본 연구를 통해 Centistes Haliday (벌목: 고치벌과: 잎벌레고치벌아과)에 속하는 7종 C. (Ancylocentrus) ater (Nees), C. (A) mucri Belokobylskij, C. (A.) paupella (Shenefelt), C. (A.) rufus Chen and Achterberg, C. (Centistes) pumilio Belokobylskij, C. (C.) tsherskii Belokobylskij, C. (Syrrhizus) delusorius (Förster)을 한국에 처음으로 보고한다. 또한 각 종에 대한 식별형질과 숙주 정보, 사진 등의 정보를 포함하 였다.

본 연구를 통해 2종의 Asiacentistes Belokobylskij(아시아넓은칼고치벌속: 신칭)(벌목: 고치벌과)를 보고한다. 그 중 Asiacentistes sinica Chen and Belokobylskij(긴칼집아시아넓은칼고치벌: 신칭)는 한국 미기록종으로 보고한다. 식별형질과 동아시아내 분포 정보를 포함하였다

본 연구를 통해 2종의 큰턱고치벌속(벌목, 고치벌과)을 보고한다. 수원큰턱나무좀고치벌 Cosmophorus (Cosmophorus) klugii Ratzeburg 1종 은 한국미기록종으로 보고한다. 식별형질과 분포 등의 정보를 포함하였다.

본 연구를 통해 한국산 Syntretus속의 Exosyntretus아속(벌목, 고치벌과)에 속하는 2종을 보고한다. 그 중 Syntretus (Exosyntretus) nevelskoii Belokobylskij은 국내 미기록종으로 보고한다. 전세계 기록종 목록, 식별형질과 분포 등의 정보를 포함하였다.

This study is subway tunnel field application about repair materials with crack self-healing capability. It was found that it showed good durability compared to the existing repair materials through lab test. Utilization of these mortars may have high potential for a new repair material.

The study is compressive strength of 110MPa PHC pile using ground granulated blast furnace slag to NAC, AC curing method. In the result, 20% of ground granulated blast furnace slag could be substituted for cement in PHC pile concrete.

This study relates to a crack repair techniques in the concrete structure. In order to develop repair material containing self-healing agents, smart repair methods were investigated. For the micro cracks of less than 0.3 ㎜, new repair method of surface treatment was suggested by the simple crack repair stick. In case of over 0.3 ㎜ cracks, injection method using inorganic materials was suggested for drying shrinkage and water leakage.

In this study, it was evaluated air content properties of concrete using air-entraining agents for modified flyash.

In this study, it was evaluated the carbonation properties of concrete by replacement of the flyash after it was ground by vibration mill and was modified chemically. Also, it was compared to 1day, 3day, 7day, 28day and 56day-strength of the concrete, respectively.